Heat exchange energy-saving system of PCB laminating machine

Abstract

The utility model discloses a heat exchange energy-saving system of a printed circuit board (PCB) laminating machine. Comprising a first laminating module, a second laminating module and at least one oil-oil heat exchange module, the first laminating module is connected with the second laminating module through the oil-oil heat exchange module; the oil-oil heat exchange module comprises a first oil-oil heat exchanger; the first oil-oil heat exchanger is respectively connected with the circulation loop of the first lamination module and the circulation loop of the second lamination module through different auxiliary hot oil pipelines; and heat conduction oil output by a circulation loop of the first lamination module and the second lamination module is subjected to heat exchange in the first oil-oil heat exchanger and then is sent back to the first lamination module and the second lamination module respectively. According to the utility model, the first oil-oil heat exchanger is additionally arranged, so that the 230 DEG C heat conduction oil of the first lamination module and the 80 DEG C heat conduction oil of the second lamination module are subjected to heat exchange, and after the two heat conduction oil reach the balance temperature of 155 DEG C, the cooling tower is used for cooling and the electric heating is used for heating respectively, so that the energy consumption loss is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of PCB laminators, and in particular relates to a heat exchange energy-saving system for a PCB laminator. Background Art

[0002] PCB, the full name of which is Printed Circuit Board, is also referred to as PCB. It is not only a stable support for electronic components, but also a bridge and link for electrical connection, carrying the transmission of current and signals. When making PCB, it is often necessary to fill the buried holes with resin so that the PCB laminator can perform subsequent pressing and other processes. For example, in the prior art, the Chinese patent with publication number CN101697661B discloses a method for plugging holes in PCB boards and a method for making double-sided PCB boards, which also mentions resin plugging holes. When the melting temperature of the PCB laminator rises to 70°C, the resin begins to melt. As the melting temperature further increases, the resin also further melts and begins to flow. In the temperature range of 70°C to 140°C, the resin is a fluid, and it is precisely because of the flowability of the resin that the resin can be used for filling and wetting. As the temperature gradually increases, the fluidity of the resin undergoes a process from small to large and then to small. Finally, when the melting temperature reaches 160-170°C, the fluidity of the resin is 0, and the temperature at this time is called the curing temperature of the resin.

[0003] In the traditional PCB manufacturing process, there are multiple PCB laminators operating simultaneously to meet production needs, and the operation stages of each laminator may be different. Take two laminators as an example, assuming that the first PCB laminator is in the resin curing completion stage and the second PCB laminator is in the resin curing stage. The thermal oil in the first PCB laminator in the resin curing completion stage needs to be cooled down from 230°C, while the thermal oil in the second PCB laminator in the resin curing stage needs to be heated up from 80°C. If the conventional technical solution is used, the first PCB laminator uses 32°C cooling water to directly cool the thermal oil, while the second PCB laminator uses electric heating to directly heat the 80°C thermal oil. However, this electric heating method causes huge energy loss, especially in large-scale production. This high energy consumption not only increases production costs, but also has obvious deficiencies in environmental protection.

[0004] Therefore, there is an urgent need for a heat exchange energy-saving system for a PCB laminator to solve the above-mentioned problems of high energy consumption, low efficiency, and poor environmental protection. Summary of the invention

[0005] In view of the problems in the related technology, the utility model proposes a heat exchange energy-saving system for a PCB laminator to overcome the above-mentioned technical problems existing in the existing related technology. The utility model increases the oil-to-oil heat exchange module and sets a cooling tower, a thermal oil heating main pipeline, a main hot oil pipeline and a secondary hot oil pipeline, so that the 230°C thermal oil of the first laminating module and the 80°C thermal oil of the second laminating module are first heat exchanged. When both reach a equilibrium temperature of 155°C, they are cooled by a cooling tower and heated by electric heating respectively, so as to optimize the heat exchange process, reduce energy consumption loss, improve production efficiency, and meet environmental protection requirements.

[0006] The technical solution of the utility model is implemented as follows: a heat exchange energy-saving system for a PCB laminator, comprising:

[0007] A first lamination module, a second lamination module, and at least one oil-to-oil heat exchange module; the first lamination module and the second lamination module are connected via the oil-to-oil heat exchange module;

[0008] The first lamination module comprises a first PCB lamination unit, a first water-oil heat exchanger and a first oil pump which are sequentially connected to form a circulation loop; the second lamination module comprises a second PCB lamination unit, a second water-oil heat exchanger and a second oil pump which are sequentially connected to form a circulation loop; and the recycling of hot oil is conducive to reducing energy waste;

[0009] The first oil pump and the second oil pump are used to promote the circulation of the heat transfer oil in the entire system to ensure that the heat can be evenly distributed and exchanged;

[0010] It also includes a cooling tower and a heat transfer oil heating main pipeline; wherein the cooling tower is connected to the first water-oil heat exchanger and the second water-oil heat exchanger respectively; each of the laminating modules is also provided with a heating main pipeline inlet and a heating main pipeline outlet, and the heat transfer oil heating main pipeline is connected to the heating main pipeline inlet and the heating main pipeline outlet of each of the laminating modules respectively through different main hot oil pipelines; the heat transfer oil heating main pipeline includes an electric heating unit, and the electric heating unit provides heat for the heat transfer oil of each of the laminating modules through electric heating;

[0011] The oil-oil heat exchange module includes a first oil-oil heat exchanger, which is connected to the circulation loop of the first lamination module and the circulation loop of the second lamination module through different auxiliary hot oil pipelines; the heat transfer oil output from the circulation loop of the first lamination module and the circulation loop of the second lamination module completes heat exchange in the first oil-oil heat exchanger, and then is sent back to the circulation loop of the first lamination module and the circulation loop of the second lamination module respectively;

[0012] In the utility model, by adding the oil-to-oil heat exchange module and setting a cooling tower, a thermal oil heating main pipeline, a main hot oil pipeline and a secondary hot oil pipeline, etc., the 230°C thermal oil of the first laminated module and the 80°C thermal oil of the second laminated module are first heat exchanged. When both reach an equilibrium temperature of 155°C, they are cooled by a cooling tower and heated by electric heating respectively, thereby achieving a significant reduction in energy consumption losses.

[0013] The cooling tower is used to provide cooling water for each of the water-to-oil heat exchangers, and to exchange heat with the heat-conducting oil in each of the water-to-oil heat exchangers through the cooling water, thereby achieving cooling.

[0014] Furthermore, a first valve is provided at the inlet and outlet of the heating main pipeline for controlling the heat transfer oil to flow in and out of the heat transfer oil heating main pipeline.

[0015] Furthermore, the auxiliary hot oil pipeline includes an oil outlet pipe and an oil return pipe; each PCB laminating unit transports the heat transfer oil to the first oil-oil heat exchanger for heat exchange through the oil outlet pipe, and the first oil-oil heat exchanger returns the heat transfer oil after heat exchange to the corresponding PCB laminating unit through the oil return pipe; a third valve is provided on the oil outlet pipe and the oil return pipe.

[0016] Furthermore, the cooling tower is connected to the first water-oil heat exchanger through a first water outlet and a first water return to form a circulating water circuit; the second water-oil heat exchanger is connected to the cooling tower through a second water outlet and a second water return to form another circulating water circuit;

[0017] The design of different circulating water circuits of the cooling tower and each of the water-oil heat exchangers makes the heat exchange energy-saving system of the PCB laminator of the utility model have high reliability. Even if one of the water-oil heat exchangers or a water circuit fails, it will not affect the normal cooling of another water-oil heat exchanger. This design reduces the risk of system shutdown due to single-point failure and improves the overall reliability of the system; moreover, when a water circuit needs maintenance, it can be shut down alone without shutting down the entire system, which helps to reduce downtime and reduce maintenance costs.

[0018] Further, the main hot oil pipeline includes a first main oil circuit and a second main oil circuit; the first main oil circuit includes a first oil outlet branch and a first oil return branch, and the second main oil circuit includes a second oil outlet branch and a second oil return branch; the thermal oil heating main pipeline is connected to the heating main pipeline inlet and the heating main pipeline outlet of the first lamination module through the first oil outlet branch and the first oil return branch respectively; the thermal oil heating main pipeline is connected to the heating main pipeline inlet and the heating main pipeline outlet of the second lamination module through the second oil outlet branch and the second oil return branch respectively;

[0019] In the utility model, the design of different branches makes the heating system of each lamination module more stable. Even if one of the lamination modules fails, it will not affect the normal heating of another lamination module, thereby ensuring the stability and reliability of the entire production line.

[0020] Furthermore, the heating main pipeline inlet of each of the lamination modules is connected to the heating main pipeline outlet to facilitate the circulation of the heat transfer oil.

[0021] Furthermore, a second valve is provided at the inlet and outlet of each oil pump; in the utility model, the first valve, the second valve and the third valve are all used to control the flow direction and flow rate of the heat transfer oil.

[0022] Furthermore, the first oil-to-oil heat exchanger is a shell-and-tube heat exchanger dedicated to PCB thermal oil.

[0023] Preferably, the temperature of the heat transfer oil after the heat exchange in the first oil-oil heat exchanger is A°C; the temperature of the heat transfer oil output by the heat transfer oil heating main pipeline ranges from 1.3A to 1.6A°C.

[0024] Preferably, the temperature of the cooling water output by the cooling tower is in the range of 30-34°C; the temperature of the cooling water output by each water-oil heat exchanger after cooling is in the range of 35-40°C.

[0025] Furthermore, each of the PCB laminating machine groups includes a plurality of PCB laminating machines; within the same PCB laminating machine group, the oil inlet and oil outlet ends of each of the PCB laminating machines are arranged in parallel.

[0026] Beneficial effects of the utility model:

[0027] The utility model discloses a heat exchange energy-saving system for a PCB laminating machine, comprising a first laminating module, a second laminating module, and at least one oil-oil heat exchange module; the first laminating module and the second laminating module are connected through the oil-oil heat exchange module; the oil-oil heat exchange module comprises a first oil-oil heat exchanger, and the first oil-oil heat exchanger is respectively connected to the circulation loop of the first laminating module and the circulation loop of the second laminating module through different auxiliary hot oil pipelines; the heat transfer oil output from the circulation loop of the first laminating module and the circulation loop of the second laminating module completes heat exchange in the first oil-oil heat exchanger, and then is respectively sent back to the circulation loop of the first laminating module and the circulation loop of the second laminating module. The utility model adds the first oil-oil heat exchanger, so that the 230°C heat transfer oil of the first laminating module and the 80°C heat transfer oil of the second laminating module can exchange heat. When both reach a balance temperature of 155°C, they are cooled by a cooling tower and heated by electric heating, respectively, thereby achieving a significant reduction in energy consumption losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural schematic diagram of a heat exchange energy-saving system for a PCB laminator of the utility model;

[0029] Figure 2 Another structural schematic diagram of a heat exchange energy-saving system for a PCB laminator of the utility model;

[0030] Figure 3 It is a schematic structural diagram of the first lamination module of the present utility model.

[0031] Marking Description:

[0032] 1. First lamination module; 11. First PCB lamination unit; 12. First water-oil heat exchanger; 13. First oil pump; 2. Second lamination module; 21. Second PCB lamination unit; 22. Second water-oil heat exchanger; 23. Second oil pump; 3. First oil-oil heat exchanger; 31. Oil outlet pipe; 32. Oil return pipe; 4. Cooling tower; 41. First water outlet; 42. First water return; 43. Second water outlet; 44. Second water return; 5. Thermal oil heating main pipeline; 51. First oil outlet branch; 52. First oil return branch; 53. Second oil outlet branch; 54. Second oil return branch. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] like Figure 1-3 As shown, this embodiment provides a heat exchange energy-saving system for a PCB laminator, comprising:

[0036] A first lamination module 1, a second lamination module 2, and at least one oil-to-oil heat exchange module; the first lamination module 1 and the second lamination module 2 are connected via the oil-to-oil heat exchange module;

[0037] The first lamination module 1 comprises a first PCB lamination unit 11, a first water-oil heat exchanger 12 and a first oil pump 13 which are sequentially connected to form a circulation loop; the second lamination module 2 comprises a second PCB lamination unit 21, a second water-oil heat exchanger 22 and a second oil pump 23 which are sequentially connected to form a circulation loop; the recycling of hot oil is conducive to reducing energy waste;

[0038] The first oil pump 13 and the second oil pump 23 are used to promote the circulation of the heat transfer oil in the entire system to ensure that the heat can be evenly distributed and exchanged;

[0039] It also includes a cooling tower 4 and a heat transfer oil heating main pipeline 5; wherein the cooling tower 4 is connected to the first water-oil heat exchanger 12 and the second water-oil heat exchanger 22 respectively; each of the laminating modules is also provided with a heating main pipeline inlet and a heating main pipeline outlet, and the heat transfer oil heating main pipeline 5 is connected to the heating main pipeline inlet and the heating main pipeline outlet of each of the laminating modules through different main hot oil pipelines; the heat transfer oil heating main pipeline 5 includes an electric heating unit, and the electric heating unit provides heat for the heat transfer oil of each of the laminating modules through electric heating;

[0040] The oil-oil heat exchange module includes a first oil-oil heat exchanger 3, which is connected to the circulation loop of the first lamination module 1 and the circulation loop of the second lamination module 2 through different auxiliary hot oil pipelines; the heat transfer oil output from the circulation loop of the first lamination module 1 and the circulation loop of the second lamination module 2 completes heat exchange in the first oil-oil heat exchanger 3, and then is sent back to the circulation loop of the first lamination module 1 and the circulation loop of the second lamination module 2 respectively;

[0041] In this embodiment, by adding the oil-to-oil heat exchange module and setting a cooling tower 4, a thermal oil heating main pipeline 5, a main hot oil pipeline and a secondary hot oil pipeline, etc., the 230°C thermal oil of the first laminate module 1 and the 80°C thermal oil of the second laminate module 2 are first heat exchanged. When both reach an equilibrium temperature of 155°C, they are cooled by the cooling tower 4 and heated by electric heating respectively, thereby significantly reducing energy consumption losses.

[0042] The cooling tower 4 is used to provide cooling water for each of the water-to-oil heat exchangers, and to exchange heat with the heat transfer oil in each of the water-to-oil heat exchangers through the cooling water, thereby achieving temperature reduction.

[0043] Specifically, a first valve is provided at the inlet and outlet of the heating main pipeline, which is used to control the heat transfer oil to enter and exit the heat transfer oil heating main pipeline 5.

[0044] Specifically, the auxiliary hot oil pipeline includes an oil outlet pipe 31 and an oil return pipe 32; each PCB laminating unit transports the heat transfer oil to the first oil-oil heat exchanger 3 for heat exchange through the oil outlet pipe 31, and the first oil-oil heat exchanger 3 returns the heat transfer oil after heat exchange to the corresponding PCB laminating unit through the oil return pipe 32; a third valve is provided on the oil outlet pipe 31 and the oil return pipe 32.

[0045] Specifically, the cooling tower 4 is connected to the first water-oil heat exchanger 12 through a first water outlet 41 and a first water return 42 to form a circulating water circuit; the second water-oil heat exchanger 22 is connected to the cooling tower 4 through a second water outlet 43 and a second water return 44 to form another circulating water circuit;

[0046] The design of the cooling tower 4 and each of the water-oil heat exchangers with different circulating water circuits makes the heat exchange energy-saving system of the PCB laminator of this embodiment have high reliability. Even if one of the water-oil heat exchangers or a water circuit fails, it will not affect the normal cooling of another water-oil heat exchanger. This design reduces the risk of system shutdown due to single-point failure and improves the overall reliability of the system; moreover, when a water circuit needs maintenance, it can be shut down alone without shutting down the entire system, which helps to reduce downtime and reduce maintenance costs.

[0047] Specifically, the main hot oil pipeline includes a first main oil circuit and a second main oil circuit; the first main oil circuit includes a first oil outlet branch 51 and a first oil return branch 52, and the second main oil circuit includes a second oil outlet branch 53 and a second oil return branch 54; the thermal oil heating main pipeline 5 is connected to the heating main pipeline inlet and the heating main pipeline outlet of the first lamination module 1 through the first oil outlet branch 51 and the first oil return branch 52 respectively; the thermal oil heating main pipeline 5 is connected to the heating main pipeline inlet and the heating main pipeline outlet of the second lamination module 2 through the second oil outlet branch 53 and the second oil return branch 54 respectively;

[0048] In this embodiment, the design of different branches makes the heating system of each lamination module more stable. Even if one of the lamination modules fails, it will not affect the normal heating of another lamination module, thereby ensuring the stability and reliability of the entire production line.

[0049] Specifically, the heating main pipeline inlet of each of the lamination modules is connected to the heating main pipeline outlet to facilitate the circulation of the heat transfer oil.

[0050] Specifically, a second valve is provided at the inlet and outlet of each oil pump; in this embodiment, the first valve, the second valve and the third valve are all used to control the flow direction and flow rate of the heat transfer oil.

[0051] Specifically, the first oil-oil heat exchanger 3 is a shell-and-tube heat exchanger dedicated to PCB thermal oil.

[0052] Specifically, the temperature of the heat transfer oil after the heat exchange in the first oil-oil heat exchanger 3 is A°C; the temperature of the heat transfer oil output by the heat transfer oil heating main pipeline 5 ranges from 1.3A to 1.6A°C.

[0053] Specifically, the temperature range of the cooling water output by the cooling tower 4 is 30-34°C, and 32°C is preferably selected in this embodiment; the temperature range of the cooling water output by each water-oil heat exchanger after cooling is 35-40°C, and 37°C is preferably selected in this embodiment.

[0054] Specifically, each of the PCB laminating machine groups includes a plurality of PCB laminating machines; in the same PCB laminating machine group, the oil inlet and oil outlet ends of each of the PCB laminating machines are arranged in parallel.

[0055] like Figure 1 As shown, in this embodiment, it is assumed that A℃ is 155℃, and it is further assumed that the first PCB laminating unit 11 is in the resin curing completion stage, that is, the temperature of the heat transfer oil in the first PCB laminating unit 11 is 230℃; at the same time, it is assumed that the second PCB laminating unit 21 is in the resin curing stage, that is, the temperature of the heat transfer oil in the second PCB laminating unit 21 is 80℃; the operation process of the heat exchange energy-saving system of a PCB laminating machine described in this embodiment is as follows:

[0056] The first lamination module 1 closes the first valve, the second valves on both sides of the first oil pump 13 are opened, and the first oil pump 13 introduces the 230°C heat transfer oil from the oil outlet pipe 31 into the first oil-oil heat exchanger 3; then the first oil-oil heat exchanger 3 returns to the circulation loop of the first lamination module 1 through the oil return pipe 32. The second lamination module 2 closes the first valve, the second valves on both sides of the second oil pump 23 are opened, and the second oil pump 23 introduces the 80°C heat transfer oil from the oil outlet pipe 31 into the first oil-oil heat exchanger 3; then the first oil-oil heat exchanger 3 returns to the circulation loop of the second lamination module 2 through the oil return pipe 32.

[0057] In the first oil-oil heat exchanger 3, the 230°C heat transfer oil and the 80°C heat transfer oil are continuously circulated and heat exchanged until both reach a balanced temperature of 155°C; after reaching temperature equilibrium, the 155°C heat transfer oil returns to the circulation loop of the first laminate module 1 and the circulation loop of the second laminate module 2 through different return oil pipes 32. Then, the third valve on the secondary hot oil pipeline is closed, the first valve of the second laminate module 2 is opened, and the 155°C heat transfer oil returned to the first laminate module 1 continues to cool down with the 32°C cooling water output by the cooling tower 4, and the 155°C heat transfer oil returned to the second laminate module 2 continues to heat up with the heat transfer oil electrically heated by the heat transfer oil heating main pipeline 5.

[0058] In this embodiment, whether the heat transfer oil of each laminating module is heated up or cooled down from 155°C, compared with the traditional 230°C cooling or 80°C heating process, the energy loss is significantly reduced. At the same time, this embodiment not only effectively shortens the time period of each laminating module when cooling or heating the resin, but also significantly improves its work efficiency. Thereby, the cost is effectively reduced, the energy consumption is significantly reduced, the work efficiency is significantly improved, and the environmental protection performance is comprehensively enhanced, which brings a more economical, efficient and environmentally friendly solution for the simultaneous operation of multiple PCB laminating machines.

[0059] According to the disclosure and teaching of the above description, the technical personnel in the field to which the utility model belongs can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.

Claims

1. A heat exchange energy-saving system for a PCB laminator, characterized in that: include: A first lamination module, a second lamination module, and at least one oil-to-oil heat exchange module; the first lamination module and the second lamination module are connected via the oil-to-oil heat exchange module; The first lamination module comprises a first PCB lamination unit, a first water-oil heat exchanger and a first oil pump which are sequentially connected to form a circulation loop; the second lamination module comprises a second PCB lamination unit, a second water-oil heat exchanger and a second oil pump which are sequentially connected to form a circulation loop; It also includes a cooling tower and a heat transfer oil heating main pipeline; wherein the cooling tower is connected to the first water-oil heat exchanger and the second water-oil heat exchanger respectively; each of the laminating modules is also provided with a heating main pipeline inlet and a heating main pipeline outlet, and the heat transfer oil heating main pipeline is connected to the heating main pipeline inlet and the heating main pipeline outlet of each of the laminating modules respectively through different main hot oil pipelines; the heat transfer oil heating main pipeline includes an electric heating unit, and the electric heating unit provides heat for the heat transfer oil of each of the laminating modules through electric heating; The oil-oil heat exchange module includes a first oil-oil heat exchanger, which is connected to the circulation loop of the first lamination module and the circulation loop of the second lamination module through different auxiliary hot oil pipelines; the heat transfer oil output from the circulation loop of the first lamination module and the circulation loop of the second lamination module completes heat exchange in the first oil-oil heat exchanger, and then is sent back to the circulation loop of the first lamination module and the circulation loop of the second lamination module.

2. A heat exchange energy-saving system for a PCB laminator according to claim 1, characterized in that: A first valve is provided at the inlet and outlet of the heating main pipeline for controlling the heat transfer oil to enter and exit the heat transfer oil heating main pipeline; a second valve is provided at the inlet and outlet of each oil pump.

3. The heat exchange energy-saving system of a PCB laminator according to claim 1, characterized in that: The auxiliary hot oil pipeline includes an oil outlet pipe and an oil return pipe; each PCB laminating unit transports the heat transfer oil to the first oil-oil heat exchanger for heat exchange through the oil outlet pipe, and the first oil-oil heat exchanger returns the heat transfer oil after heat exchange to the corresponding PCB laminating unit through the oil return pipe; a third valve is provided on the oil outlet pipe and the oil return pipe.

4. The heat exchange energy-saving system for a PCB laminator according to claim 1, characterized in that: The cooling tower is connected to the first water-oil heat exchanger through a first water outlet and a first water return to form a circulating water circuit; the second water-oil heat exchanger is connected to the cooling tower through a second water outlet and a second water return to form another circulating water circuit.

5. The heat exchange energy-saving system for a PCB laminator according to claim 1, characterized in that: The main hot oil pipeline includes a first main oil circuit and a second main oil circuit; the first main oil circuit includes a first oil outlet branch and a first oil return branch, and the second main oil circuit includes a second oil outlet branch and a second oil return branch; the thermal oil heating main pipeline is connected to the heating main pipeline inlet and the heating main pipeline outlet of the first lamination module through the first oil outlet branch and the first oil return branch respectively; the thermal oil heating main pipeline is connected to the heating main pipeline inlet and the heating main pipeline outlet of the second lamination module through the second oil outlet branch and the second oil return branch respectively.

6. The heat exchange energy-saving system for a PCB laminator according to claim 1, characterized in that: The heating main pipeline inlet of each lamination module is connected to the heating main pipeline outlet.

7. The heat exchange energy-saving system for a PCB laminator according to claim 1, characterized in that: The first oil-to-oil heat exchanger is a shell-and-tube heat exchanger dedicated to PCB thermal oil.

8. The heat exchange energy-saving system for a PCB laminator according to claim 1, characterized in that: The temperature of the heat transfer oil after the heat exchange in the first oil-to-oil heat exchanger is A°C; the temperature of the heat transfer oil output by the heat transfer oil heating main pipeline ranges from 1.3A to 1.6A°C.

9. The heat exchange energy-saving system for a PCB laminator according to claim 1, characterized in that: The temperature of the cooling water outputted by the cooling tower is in the range of 30-34°C; the temperature of the cooling water outputted by each of the water-oil heat exchangers after cooling is in the range of 35-40°C.

10. The heat exchange energy-saving system for a PCB laminator according to claim 1, characterized in that: Each of the PCB laminating machine groups comprises a plurality of PCB laminating machines; in the same PCB laminating machine group, the oil inlet and oil outlet ends of each of the PCB laminating machines are arranged in parallel.

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