An air heater used for FPC cover film bonding

Abstract

The present invention relates to an air heater used for FPC covering film bonding, comprising a shell and an air pump fixedly installed on the side thereof, a working chamber is provided inside the shell, a hydraulic cylinder is fixedly installed on the top of the inner wall of the shell, a drying mechanism for removing moisture on the surface of the FPC covering film is arranged on one side of the hydraulic cylinder, an exhaust hole is provided on the bottom surface of the shell, and a blocking mechanism for adjusting whether the exhaust hole is ventilated is arranged on the bottom of the shell; the obtained dry airflow is blown out through the output end of the air jet pipe to blow and dry the FPC covering film located on the first horizontal plate, and the temperature of the air in the working chamber is increased in cooperation with two electric heating plates, at this time, the slider and the exhaust hole are in a separated state, which is convenient for the air in the working chamber to be discharged, thereby accelerating the drying speed of water droplets on the surface of the FPC covering film, and avoiding affecting the efficiency of the FPC covering film bonding during hot pressing bonding.

Description

Technical Field

[0001] The invention relates to the technical field of FPC cover film lamination, in particular to an air heater applied to FPC cover film lamination. Background Art

[0002] FPC cover film lamination is a key step in the FPC (flexible circuit board) production process. It involves accurately laminating the cover film to the FPC substrate to protect the circuit and prevent erosion from the external environment. At the same time, the tightly fitted cover film can prevent circuit short circuits, improve the electrical performance and reliability of the FPC, and also improve the appearance quality of the FPC, making it more beautiful and durable.

[0003] Prior to laminating the FPC cover film, since the FPC cover film is stored in a cold storage, it is necessary to take out the FPC cover film and thaw it when using it. The surface of the FPC cover film easily absorbs moisture and produces water droplets, which will affect the laminating efficiency of the FPC cover film during hot pressing laminating. At the same time, before laminating the FPC cover film, the FPC cover film and the circuit board need to be preheated to eliminate stress. After laminating the FPC cover film, it needs to be baked and cured. However, the FPC cover film is in a sealed environment when laminating, and the temperature cannot be adjusted quickly, which prolongs the laminating time of the FPC cover film. Summary of the invention

[0004] The technical problems solved by this solution are:

[0005] How to solve the problem that the FPC cover film needs to be thawed when used, and the surface easily absorbs moisture and produces water droplets, which affects the bonding efficiency of the FPC cover film during hot pressing bonding;

[0006] How to solve the problem that when the FPC cover film is being laminated, the temperature cannot be adjusted quickly in a sealed environment, thereby prolonging the laminating time of the FPC cover film.

[0007] The object of the present invention can be achieved by the following technical scheme: an air heater used for FPC cover film bonding, comprising a shell and an air pump fixedly mounted on the side thereof, a working chamber is provided inside the shell, a longitudinally arranged hydraulic cylinder is fixedly mounted on the top of the inner wall of the shell, a drying mechanism for removing moisture from the surface of the FPC cover film is provided on one side of the hydraulic cylinder, an exhaust hole is provided on the bottom surface of the shell, and a blocking mechanism for adjusting whether the exhaust hole is ventilated is provided at the bottom of the shell;

[0008] The drying mechanism includes an adjusting tube and a material storage box fixedly connected to the inner wall of the outer shell, an adjusting piston is slidably arranged inside the adjusting tube, a transmission rod is fixedly connected to the top of the adjusting piston, a turning frame is rotatably arranged on the outer shell between the transmission rod and the hydraulic cylinder through a pin shaft, the top of the transmission rod is movably connected to one end of the turning frame through a first shifting rod, the protruding end of the hydraulic cylinder is slidably connected to the other end of the turning frame through a second shifting rod, the second shifting rod is located below the turning frame, and a thrust spring is arranged between the adjusting piston and the bottom of the inner wall of the adjusting tube.

[0009] A further technical improvement of the present invention is that: the top of the regulating tube is connected to an air inlet pipe, the input end of the air inlet pipe is connected to the top of a storage box, the bottom of the storage box is connected to an air outlet pipe, the input end of the air outlet pipe is fixedly passed through the outer shell and is connected to the output end of the air pump, the interior of the storage box is filled with a sufficient amount of desiccant, and the middle part of the regulating tube is also connected to an air jet pipe.

[0010] A further technical improvement of the present invention is that: a first horizontal plate for placing the FPC covering film is arranged between the material storage box and the regulating tube, and a fixing frame for positioning the FPC covering film is fixedly installed at the four corners of the first horizontal plate, and the position of the first horizontal plate corresponds to the position of the output end of the jet tube; by turning on the air pump and the two electric heating plates, at this time, the protruding end of the hydraulic cylinder shrinks from half the length to the shortest, and the flip frame is driven to rotate by the second lever, so that the transmission rod drives the regulating piston to slide downward to the bottom of the input end of the jet tube, and the airflow blown out by the air pump will enter the material storage box, and the airflow will be dried and dehumidified by the desiccant inside it, and then enter the regulating tube through the air intake pipe, and the obtained dry airflow is blown out through the output end of the jet tube, and the FPC covering film located on the first horizontal plate is blown dry, and the temperature of the air in the working chamber is increased in cooperation with the two electric heating plates. At this time, the slider and the exhaust hole are in a separated state, which is convenient for the discharge of air in the working chamber, thereby accelerating the drying speed of water droplets on the surface of the FPC covering film, and avoiding affecting the efficiency of the FPC covering film bonding during hot pressing bonding.

[0011] A further technical improvement of the present invention is that the blocking mechanism includes a guide plate fixedly connected to the bottom of the shell, a slider is provided on the side of the guide plate facing the exhaust hole, the top of the slider is slidably connected to the shell through a guide rail, and a sealing plug for blocking the exhaust hole is fixedly embedded on the top of the slider, and a positioning plate is fixedly installed on the shell on the side of the exhaust hole away from the guide plate.

[0012] A further technical improvement of the present invention is that: an L-shaped tube is fixedly connected to the middle part of the air outlet pipe, a support piston is slidably provided on the inner wall of one end of the L-shaped tube away from the air outlet pipe, a push rod is fixedly connected to the side of the support piston, one end of the push rod movably passes through the L-shaped tube and the guide plate and is fixedly connected to the slider, a tension spring is fixedly connected between the slider and the guide plate, and the tension of the tension spring is greater than the thrust of the thrust spring.

[0013] A further technical improvement of the present invention is that: an air jet hole is provided on the outer wall of one end of the L-shaped tube away from the air outlet pipe, and the air jet hole is located between the supporting piston and the guide plate; by controlling the extended end of the hydraulic cylinder to be reset to half the length, the adjusting piston slides upward and resets, and the air flow blown out by the air pump will enter the L-shaped tube, pushing the supporting piston to slide to the end of the L-shaped tube away from the air outlet pipe, and the supporting piston cooperates with the push rod to provide thrust to the slider, so that it cooperates with the sealing plug to block the exhaust hole, so that the working chamber is in a sealed state, avoiding the heat in the working chamber from flowing out, and cooperates with the two electric heating plates to increase the air temperature in the working chamber to the threshold value, so as to quickly preheat the FPC covering film and the circuit board; after the FPC covering film is cured, the circuit board is transferred to the workbench, and the extended end of the hydraulic cylinder is controlled to shrink to the shortest again. At this time, the slider is separated from the exhaust hole, and the two electric heating plates are closed in time, and the heat in the working chamber is blown out through the exhaust hole, so that the above operation process can achieve the effect of quickly adjusting the temperature in the working chamber, thereby shortening the time for laminating the FPC covering film.

[0014] A further technical improvement of the present invention is that a workbench for supporting the circuit board is arranged in the middle of the working chamber, a hot pressing plate is arranged above the workbench, and the hot pressing plate is fixedly connected to the extended end of the hydraulic cylinder.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] When the present invention is in use, by turning on the air pump and the two electric heating plates, the extended end of the hydraulic cylinder shrinks from half the length to the shortest, and the second lever drives the flip frame to rotate, so that the transmission rod drives the adjusting piston to slide downward to the bottom of the injection pipe input end, and the airflow blown out by the air pump will enter the storage box, and the airflow will be dried and dehumidified by the desiccant inside the storage box, and then enter the adjusting pipe through the air intake pipe, and the obtained dry airflow is blown out through the output end of the injection pipe to dry the FPC covering film on the first horizontal plate, and the temperature of the air in the working chamber is increased in cooperation with the two electric heating plates. At this time, the slider and the exhaust hole are in a separated state, which is convenient for the air in the working chamber to be discharged, thereby accelerating the drying speed of water droplets on the surface of the FPC covering film, and avoiding affecting the efficiency of the FPC covering film during hot pressing bonding.

[0017] When the present invention is in use, by controlling the extended end of the hydraulic cylinder to reset to half the length, the regulating piston slides upward and resets, the air flow blown out by the air pump will enter the L-shaped tube, push the supporting piston to slide to the end of the L-shaped tube away from the air outlet pipe, and the supporting piston cooperates with the push rod to provide thrust to the slider, so that it cooperates with the sealing plug to block the exhaust hole, so that the working chamber is in a sealed state, avoiding the heat in the working chamber from flowing out, and cooperates with the two electric heating plates to increase the air temperature in the working chamber to the threshold value, so as to quickly preheat the FPC covering film and the circuit board; after the FPC covering film is cured, the circuit board is transferred to the workbench, and the extended end of the hydraulic cylinder is controlled to shrink to the shortest again. At this time, the slider is separated from the exhaust hole, and the two electric heating plates are closed in time, and the heat in the working chamber is blown out through the exhaust hole, so that the above operation process can achieve the effect of quickly adjusting the temperature in the working chamber, thereby shortening the time for bonding the FPC covering film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0019] Figure 1 It is a cross-sectional view of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the drying mechanism structure of the present invention;

[0021] Figure 3 It is a schematic structural perspective view of the first horizontal plate and the fixing frame of the present invention;

[0022] Figure 4 It is a schematic diagram of the blocking mechanism structure of the present invention;

[0023] Figure 5 For the present invention Figure 4 A magnified view of the structure at center;

[0024] Figure 6 It is a three-dimensional schematic diagram of the local structure of the blocking mechanism of the present invention.

[0025] In the figure: 1. hot pressing plate; 2. second mechanical arm; 3. second horizontal plate; 4. workbench; 5. shell; 6. drying mechanism; 7. blocking mechanism; 8. air pump; 9. electric heating plate; 10. first mechanical arm; 11. curing tooling; 12. hydraulic cylinder; 13. second lever; 14. exhaust hole; 61. turning frame; 62. adjusting piston; 63. material storage box; 64. exhaust pipe; 65. first horizontal plate; 66. jet pipe; 67. adjusting pipe; 68. transmission rod; 69. fixing frame; 71. positioning plate; 72. slider; 73. guide plate; 74. L-shaped tube; 75. push rod; 76. jet hole; 77. supporting piston; 78. tension spring. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 6 As shown, an air heater used for FPC covering film bonding includes a shell 5 and an air pump 8 fixedly installed on the side thereof, a working chamber is opened inside the shell 5, a longitudinally arranged hydraulic cylinder 12 is fixedly installed on the top of the inner wall of the shell 5, a drying mechanism 6 for removing moisture from the surface of the FPC covering film is arranged on one side of the hydraulic cylinder 12, an exhaust hole 14 is opened on the bottom surface of the shell 5, and a blocking mechanism 7 for adjusting whether the exhaust hole 14 is ventilated is arranged at the bottom of the shell 5.

[0028] See also Figure 1-Figure 6 As shown, the above-mentioned drying mechanism 6 includes an adjusting tube 67 and a storage box 63 fixedly connected to the inner wall of the outer shell 5, an adjusting piston 62 is slidably arranged inside the adjusting tube 67, a transmission rod 68 is fixedly connected to the top of the adjusting piston 62, a flip frame 61 is rotatably arranged on the outer shell 5 between the transmission rod 68 and the hydraulic cylinder 12 through a pin shaft, the top end of the transmission rod 68 is movably connected to one end of the flip frame 61 through a first lever, the protruding end of the hydraulic cylinder 12 is slidably connected to the other end of the flip frame 61 through a second lever 13, the second lever 13 is located below the flip frame 61, and a thrust spring is arranged between the adjusting piston 62 and the bottom of the inner wall of the adjusting tube 67.

[0029] See also Figure 1-Figure 6 As shown, the top of the above-mentioned regulating tube 67 is connected to an air inlet pipe, the input end of the air inlet pipe is connected to the top of the storage box 63, the bottom of the storage box 63 is connected to an air outlet pipe 64, the input end of the air outlet pipe 64 is fixedly passed through the outer shell 5 and is connected to the output end of the air pump 8, the interior of the storage box 63 is filled with a sufficient amount of desiccant, and the middle part of the regulating tube 67 is also connected to a jet pipe 66.

[0030] See also Figure 1-Figure 6As shown, a first horizontal plate 65 for placing the FPC covering film is arranged between the above-mentioned storage box 63 and the regulating tube 67, and a fixing frame 69 for positioning the FPC covering film is fixedly installed at the four corners of the first horizontal plate 65, and the position of the first horizontal plate 65 corresponds to the position of the output end of the injection tube 66; by turning on the air pump 8 and the two electric heating plates 9, at this time, the extended end of the hydraulic cylinder 12 is retracted from half the length to the shortest, and the flip frame 61 is driven to rotate by the second lever 13, so that the transmission rod 68 drives the regulating piston 62 to slide downward to the bottom of the input end of the injection tube 66, and the air is The airflow blown out by the pump 8 will enter the storage box 63, and the airflow will be dried and dehumidified by the desiccant inside it, and then enter the regulating pipe 67 through the air inlet pipe. The obtained dry airflow will be blown out through the output end of the jet pipe 66 to dry the FPC covering film on the first horizontal plate 65, and cooperate with the two electric heating plates 9 to increase the temperature of the air in the working chamber. At this time, the slider 72 and the exhaust hole 14 are in a separated state, which is convenient for the air in the working chamber to be discharged, thereby accelerating the drying speed of water droplets on the surface of the FPC covering film, and avoiding affecting the efficiency of the FPC covering film during hot pressing bonding.

[0031] See also Figure 1-Figure 6 As shown, the blocking mechanism 7 includes a guide plate 73 fixedly connected to the bottom of the shell 5, a slider 72 is provided on the side of the guide plate 73 facing the exhaust hole 14, the top of the slider 72 is slidably connected to the shell 5 through a guide rail, and a sealing plug for blocking the exhaust hole 14 is fixedly embedded on the top of the slider 72, and a positioning plate 71 is fixedly installed on the shell 5 on the side of the exhaust hole 14 away from the guide plate 73.

[0032] See also Figure 1-Figure 6 As shown, the middle part of the above-mentioned air outlet pipe 64 is fixedly connected with an L-shaped tube 74, and a support piston 77 is slidably provided on the inner wall of one end of the L-shaped tube 74 away from the air outlet pipe 64, and a push rod 75 is fixedly connected to the side of the support piston 77, and one end of the push rod 75 movably passes through the L-shaped tube 74 and the guide plate 73 and is fixedly connected to the slider 72, and a tension spring 78 is fixedly connected between the slider 72 and the guide plate 73, and the tension of the tension spring 78 is greater than the thrust of the thrust spring.

[0033] See also Figure 4 and Figure 5As shown, an air jet hole 76 is formed on the outer wall of the end of the L-shaped tube 74 away from the air outlet pipe 64, and the air jet hole 76 is located between the support piston 77 and the guide plate 73; by controlling the extended end of the hydraulic cylinder 12 to be reset to half the length, the regulating piston 62 slides upward and resets, and the air flow blown out by the air pump 8 will enter the L-shaped tube 74, pushing the support piston 77 to slide to the end of the L-shaped tube 74 away from the air outlet pipe 64, and the support piston 77 cooperates with the push rod 75 to provide a thrust to the slider 72, so that it cooperates with the sealing plug to block the exhaust hole 14, so that the working chamber is in a sealed state, avoiding To prevent the heat in the working chamber from flowing out, the two electric heating plates 9 are used to increase the air temperature in the working chamber to the threshold value, so as to quickly preheat the FPC covering film and the circuit board; after the FPC covering film is cured, the circuit board is moved to the workbench 4, and the extended end of the hydraulic cylinder 12 is controlled to shrink to the shortest again. At this time, the slider 72 is separated from the exhaust hole 14, and the two electric heating plates 9 are closed in time, and the heat in the working chamber is blown out through the exhaust hole 14, so that the above operation process can quickly adjust the temperature in the working chamber, thereby shortening the time for laminating the FPC covering film.

[0034] See also Figure 1 As shown, a workbench 4 for supporting the circuit board is arranged in the middle of the above-mentioned working chamber, and a hot pressing plate 1 is arranged above the workbench 4 , and the hot pressing plate 1 is fixedly connected to the extended end of the hydraulic cylinder 12 .

[0035] See also Figure 1 As shown, a first robot arm 10 for transferring the FPC covering film is provided on one side of the hot pressing plate 1, and a second robot arm 2 for transferring the circuit board is provided on the other side of the hot pressing plate 1, and a second horizontal plate 3 for placing the circuit board is provided below the second robot arm 2, and the first robot arm 10 and the second robot arm 2 are both prior art.

[0036] See also Figure 1 As shown, both inner walls of the housing 5 are provided with electric heating plates 9 for heating the air in the working chamber, and a curing tool 11 for curing the FPC cover film is fixedly installed on the back of the inner wall of the housing 5, and the curing tool 11 is a prior art.

[0037] Working principle: When the present invention is used, first, Figure 1 and Figure 2 As shown, the stacked FPC cover film and circuit board are placed on the first horizontal plate 65 and the second horizontal plate 3 respectively; Figure 1 and Figure 2As shown, by turning on the air pump 8 and the two electric heating plates 9, at this time, the extended end of the hydraulic cylinder 12 shrinks from half the length to the shortest, and the second lever 13 drives the flip frame 61 to rotate, so that the transmission rod 68 drives the regulating piston 62 to slide downward to the bottom of the input end of the injection pipe 66, and the airflow blown out by the air pump 8 will enter the storage box 63, and the airflow will be dried and dehumidified by the desiccant inside it, and then enter the regulating pipe 67 through the air inlet pipe. The obtained dry airflow is blown out through the output end of the injection pipe 66, and the FPC covering film on the first horizontal plate 65 is blown dry, and the temperature of the air in the working chamber is increased in cooperation with the two electric heating plates 9. At this time, as shown in FIG. Figure 1 and Figure 4 As shown, the slider 72 and the exhaust hole 14 are in a separated state, which facilitates the exhaust of air in the working chamber, thereby accelerating the drying speed of water droplets on the surface of the FPC cover film and avoiding affecting the efficiency of the FPC cover film during hot pressing bonding; Figure 1 , Figure 4 and Figure 5 As shown, after the FPC covering film is completely dried, the extended end of the hydraulic cylinder 12 is controlled to be reset to half the length, and the regulating piston 62 is slid upward and reset through the action of the thrust spring, and the air flow blown out by the air pump 8 will enter the L-shaped tube 74, pushing the supporting piston 77 to slide to the end of the L-shaped tube 74 away from the air outlet pipe 64, and the air flow will be blown out from the air injection hole 76. At this time, the supporting piston 77 cooperates with the push rod 75 to provide thrust to the slider 72, so that it cooperates with the sealing plug to block the exhaust hole 14, so that the working chamber is in a sealed state, preventing the air carrying heat in the working chamber from flowing out, and cooperating with the two electric heating plates 9 to raise the air temperature in the working chamber to the threshold value, thereby quickly preheating the FPC covering film and the circuit board; Figure 1 and Figure 2 As shown, the second robot arm 2 and the first robot arm 10 are used to place the circuit board and the FPC cover film on the workbench 4 in turn, and the extended end of the hydraulic cylinder 12 is controlled to extend to the longest, and the hot pressing plate 1 is used to perform a hot pressing and bonding operation on the FPC cover film. After the hot pressing and bonding is completed, the circuit board is transferred to the curing tooling 11 for baking, so that the FPC cover film is tightly bonded; Figure 1 , Figure 4 and Figure 5 As shown, after the FPC covering film is cured, the circuit board is moved to the workbench 4, and the extended end of the hydraulic cylinder 12 is controlled to shrink to the shortest again. At this time, the slider 72 is separated from the exhaust hole 14, and the two electric heating plates 9 are closed in time. The air pump 8 blows the air into the working chamber to blow the heat in the working chamber out through the exhaust hole 14, so that the above operation process can quickly adjust the temperature in the working chamber, thereby shortening the time for bonding the FPC covering film.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An air heater for FPC cover film lamination, comprising a housing (5) and an air pump (8) fixedly mounted on the side thereof, wherein a working chamber is provided inside the housing (5), and a hydraulic cylinder (12) is fixedly mounted on the top of the inner wall of the housing (5), characterized in that: A drying mechanism (6) for removing moisture from the surface of the FPC covering film is disposed on one side of the hydraulic cylinder (12); an exhaust hole (14) is provided on the bottom surface of the housing (5); and a blocking mechanism (7) for adjusting the ventilation of the exhaust hole (14) is disposed at the bottom of the housing (5); The drying mechanism (6) comprises an adjusting tube (67) fixedly connected to the inner wall of the outer shell (5) and a material storage box (63); an adjusting piston (62) is slidably arranged inside the adjusting tube (67); a transmission rod (68) is fixedly connected to the top of the adjusting piston (62); a turning frame (61) is rotatably arranged on the outer shell (5) between the transmission rod (68) and the hydraulic cylinder (12); the top of the transmission rod (68) is movably connected to one end of the turning frame (61); the extended end of the hydraulic cylinder (12) is slidably connected to the other end of the turning frame (61) via a second shifting rod (13); the second shifting rod (13) is located below the turning frame (61); the adjusting piston (62) and the adjusting tube (67) are connected to each other. A thrust spring is arranged between the bottom of the inner wall; the top of the regulating tube (67) is connected to an air inlet pipe, the input end of the air inlet pipe is connected to the top of the material storage box (63), the bottom of the material storage box (63) is connected to an air outlet pipe (64), the input end of the air outlet pipe (64) is connected to the output end of the air pump (8), the middle of the regulating tube (67) is also connected to an air jet pipe (66), a first horizontal plate (65) for placing the FPC covering film is arranged between the material storage box (63) and the regulating tube (67), fixing frames (69) for positioning the FPC covering film are fixedly installed at the four corners of the first horizontal plate (65), and the position of the first horizontal plate (65) corresponds to the position of the output end of the air jet pipe (66); The blocking mechanism (7) comprises a guide plate (73) fixedly connected to the bottom of the housing (5); a slider (72) is provided on the side of the guide plate (73) facing the exhaust hole (14); the top of the slider (72) is slidably connected to the housing (5); and a sealing plug for blocking the exhaust hole (14) is fixedly embedded on the top of the slider (72); a positioning plate (71) is fixedly installed on the housing (5) on the side of the exhaust hole (14) away from the guide plate (73); an L-shaped tube (74) is fixedly connected to the middle of the exhaust pipe (64); a support piston (77) is slidably provided on the inner wall of one end of the L-shaped tube (74) away from the exhaust pipe (64); a push rod (75) is fixedly connected to the side of the support piston (77); one end of the push rod (75) movably penetrates the L-shaped tube (74) and the guide plate (73); The guide plate (73) is fixedly connected to the slider (72), the support piston (77) cooperates with the push rod (75) to provide a thrust to the slider (72), so that it cooperates with the sealing plug to block the exhaust hole (14), so that the working chamber is in a sealed state, a tension spring (78) is fixedly connected between the slider (72) and the guide plate (73), the tension of the tension spring (78) is greater than the thrust of the thrust spring, an injection hole (76) is opened on the outer wall of the end of the L-shaped tube (74) away from the exhaust pipe (64), and the injection hole (76) is located between the support piston (77) and the guide plate (73), a workbench (4) for supporting the circuit board is arranged in the middle of the working chamber, and a hot pressing plate (1) is arranged above the workbench (4), and the hot pressing plate (1) is fixedly connected to the protruding end of the hydraulic cylinder (12).

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