Acrylic plate hot bending shaping device

Abstract

The invention relates to the technical field of acrylic plate shaping, in particular to an acrylic plate hot bending shaping device which is used for solving the problem that an existing device cannot adjust heat in a self-adaptive mode easily. The device comprises a rack, an upper mold internally provided with a first hot runner, a lower mold internally provided with a second hot runner and a hydraulic rod used for driving the upper mold are installed on the rack, a hole is formed in a cylinder rod of the hydraulic rod, a pin rod is slidably connected in the hole, and a first air pipe and a second air pipe which are communicated with the hole are connected to the cylinder rod; a lifting valve is arranged on the first air pipe, a first pull rope is connected between a valve rod of the lifting valve and the rack, a pressure valve is arranged on the second air pipe, the first pull rope pulls the lifting valve to be closed when the cylinder rod stretches out to the first pull rope to be deformed, and the pin rod slides on the cylinder rod when the upper die makes contact with the arc-shaped acrylic plate before the first pull rope is deformed, so that the flow of heat conduction oil is increased; the device can increase the flow of the heat conduction oil along with the thickness and deformation degree of the acrylic plate, so that the hot bending shaping effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of acrylic plate shaping, in particular to an acrylic plate hot bending shaping device. BACKGROUND

[0002] In the field of virtual display, the core components of high-end display systems such as spherical reflection cavities, high-precision back-projection imaging screens, etc. have strict requirements on the shape accuracy and optical performance of acrylic plates. Taking the spherical reflection cavity of a flight simulator as an example, an arc-shaped acrylic plate is needed to be installed inside as an optical reflection or imaging carrier. Such an arc-shaped acrylic plate not only needs to have a precise spherical curvature, but also needs to ensure that there is no internal stress and no surface defects after hot bending shaping, otherwise it will directly affect the imaging clarity and stability of the virtual image system. The arc-shaped substrate of a high-precision back-projection imaging screen also relies on a high-precision hot bending process to achieve multi-curved surface modeling to match the complex optical path design and ensure the uniformity and color reproduction of the projection picture.

[0003] Currently, the acrylic plate hot bending shaping device commonly used in the field of virtual display mainly realizes shaping through the combination of "mold pressing + hot runner heating", but when adapting to arc-shaped acrylic plates of different thicknesses and different deformation degrees, there is a problem of mismatch between the hot runner heating efficiency and the workpiece requirements. The hot runner heat conduction oil flow of the existing device is mostly fixedly set and cannot be dynamically adjusted according to the actual state of the acrylic plate. For workpieces with large thickness (such as more than 10 mm) or high deformation degree (such as being bent from a plane to a large curvature sphere at one time), the heat provided by the fixed low flow rate heat conduction oil is insufficient, resulting in uneven heating inside the plate. Not only does it prolong the shaping time (additional 20%-30% heating time is needed in some scenarios), but it also easily causes local stress concentration, which may cause secondary deformation due to temperature changes in subsequent use, affecting the long-term stability of the virtual display system. For thin (such as below 5 mm) or slightly deformed acrylic plates, fixed high flow rate heat conduction oil will cause excess heat, which may cause the plate surface to yellow, the optical transmittance to decrease, and even small cracks due to local overheating, damaging the optical performance. SUMMARY

[0004] The present application provides an acrylic plate hot bending shaping device to solve the problem that the existing shaping device is not easy to adaptively adjust the heat according to the thickness and deformation degree of the acrylic plate.

[0005] In order to alleviate the above technical problems, the technical scheme provided by the present application is as follows: The utility model provides an acrylic sheet hot bending setting device, including frame, the top of frame is equipped with hydraulic pressure rod, the output end of hydraulic pressure rod is equipped with upper die, the lower part of frame is equipped with lower die, the cylinder rod of hydraulic pressure rod is equipped with hole and is connected with pin rod through the hole, the pin cap of pin rod is attached with the inner wall of hole, the cylinder rod is connected with the first air pipe and the second air pipe who communicates with hole, the first air pipe is equipped with pull valve, the second air pipe is equipped with pressure valve, the valve rod of pull valve is connected with frame between, and first pull rope is connected with the first air pipe and the second air pipe who communicates with hole. The first hot runner and the second hot runner are respectively arranged in the upper die and the lower die, when the cylinder rod is extended to the length that the first pull rope is about to deform, the first pull rope pulls the pull valve to close, before the deformation of the first pull rope, when the upper die contacts the arc-shaped acrylic sheet, the pin rod slides on the cylinder rod, so that the flow of the heat conduction oil flowing through the first hot runner and the second hot runner in unit time is increased.

[0006] Further, the first air pipe is communicated with a piston cylinder at an end away from the cylinder rod, the piston cylinder is fixedly connected to the frame and internally slidably connected with a piston rod, the frame is fixedly connected with a sliding switch, an end of the piston rod is connected to a sliding sheet of the sliding switch, when the thickness or deformation degree of the arc-shaped acrylic sheet is high, the sliding stroke of the pin rod is increased, so that the sliding distance of the piston rod driving the sliding sheet is increased to increase the flow of the heat conduction oil.

[0007] Further, the first hot runner and the second hot runner are respectively communicated with a first pipeline and a second pipeline, and the first pipeline and the second pipeline are commonly communicated with a pump-in pipeline.

[0008] Further, the pump-in pipeline is provided with a valve, the valve is fixedly connected with a small motor, an output end of the small motor is fixedly connected to a valve rod of the valve, when the sliding distance of the sliding sheet is increased, the small motor operates to increase the opening degree of the valve.

[0009] Further, the pump-in pipeline is provided with a heat oil pump, when the sliding distance of the sliding sheet is increased, the pump speed of the heat oil pump is increased.

[0010] Further, a plurality of positioning blocks are arranged in an annular array on the lower die, the positioning blocks are slidably connected to the lower die through sliding blocks, and the positioning blocks can be synchronously slid to approach or move away from the middle part of the lower die.

[0011] Further, springs are fixedly connected between the sliding blocks and the lower die, an electric telescopic rod is fixedly connected in the lower die, and second pull ropes are connected between the electric telescopic rod and the positioning blocks.

[0012] Further, the lower mold is provided with a plurality of guide rollers corresponding to the plurality of second pull ropes.

[0013] Further, the first and second hot runners are respectively communicated with first and second return pipes, the upper mold is fixedly connected with a containing box, the first and second return pipes are communicated with the containing box, and the flow of the heat conducting oil to the containing box can increase the pressure of the upper mold applied to the arc-shaped acrylic plate.

[0014] Further, the containing box is communicated with an air inlet pipe and a discharge pipe, the air inlet pipe is fixedly connected with the containing box, the discharge pipe is axially slidably connected with the containing box, the air inlet pipe is provided with a one-way valve, the containing box is fixedly connected with an electric push rod, the output end of the electric push rod is fixedly connected with the discharge pipe, and the electric push rod can drive the length of the discharge pipe inserted into the containing box to adjust the amount of the heat conducting oil contained in the containing box when the electric push rod is extended and retracted.

[0015] The beneficial effects of the present application are analyzed as follows: The present application discloses an acrylic plate hot bending and shaping device, which comprises a rack, a hydraulic rod installed on the top of the rack, an upper mold installed on the output end of the hydraulic rod, a lower mold installed on the lower part of the rack, a hole formed in the cylinder rod of the hydraulic rod and a pin rod slidably connected with the hole through the hole, a pin cap of the pin rod abutting against the inner wall of the hole, a first air pipe and a second air pipe connected with the hole and installed on the cylinder rod, a pull valve installed on the first air pipe, a pressure valve installed on the second air pipe, a first pull rope connected between the valve rod of the pull valve and the rack, a first hot runner and a second hot runner respectively formed in the upper mold and the lower mold, and the first pull rope pulling the pull valve to be closed when the cylinder rod is extended to the length at which the first pull rope is to be deformed, so that the flow of the heat conducting oil flowing through the first and second hot runners in unit time is increased when the pin rod slides on the cylinder rod when the upper mold contacts the arc-shaped acrylic plate.

[0016] During the downward movement of the hydraulic rod, if the thickness of the curved acrylic sheet is low or the degree of deformation is small, the cylinder rod extends to the length that the first pull rope will deform. At this time, the first pull rope pulls the valve rod of the lifting valve, causing the lifting valve to close. Subsequently, the cylinder rod continues to extend, and the first pull rope deforms and lengthens. At the same time, the upper mold stops moving downward after contacting the curved acrylic sheet. At this time, the cylinder rod moves downward relative to the pin rod, and the pin rod pushes the air in the cylinder rod hole to the second air pipe for discharge. Until the pin rod moves up to the top of the hole, the cylinder rod continues to extend until the upper mold applies the pressure required for shaping the curved acrylic sheet, and then the hydraulic rod stops extending. The heat transfer oil flows at a low rate. The state enters the first and second hot runners; if the curved acrylic sheet is thick or has a high degree of deformation, the upper mold will contact the curved acrylic sheet before the first pull rope is tightened to pull the valve rod of the lifting valve. At this time, the downward movement of the upper mold is blocked in advance, so that the pin moves upward relative to the cylinder rod before the lifting valve is closed, and the air in the cylinder rod hole is discharged through the first air pipe. The air discharged through the first air pipe drives the flow rate of the heat transfer oil to increase in the subsequent transmission process, thereby strengthening the shaping heat of the deformed or thick curved acrylic sheet, which facilitates the rapid shaping of the deformed or thick curved acrylic sheet. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the hot oil pump in this invention; Figure 3 This is a schematic diagram of the structure of the sliding switch in this invention; Figure 4 For the present invention Figure 3 A schematic diagram of the structure of part A; Figure 5 This is a schematic diagram of the valve structure of the present invention; Figure 6 This is a schematic diagram of the structure of the electric telescopic pole of the present invention; Figure 7 This is a schematic diagram of the structure of the housing in this invention.

[0019] icon: 100, frame; 110, upper die; 120, lower die; 130, positioning block; 140, spring; 150, second pull rope; 160, guide wheel; 170, electric telescopic rod; 200, hydraulic rod; 210, cylinder rod; 220, pin rod; 230, first air pipe; 231, pull valve; 232, first pull rope; 240, second air pipe; 241, pressure valve; 250, piston cylinder; 251, piston rod; 260, sliding switch; 300, pump-in pipe; 310, first pipe; 311, first hot runner; 312, first return pipe; 320, second pipe; 321, second hot runner; 322, second return pipe; 330, valve; 340, small motor; 350, hot oil pump; 400, containing box; 410, discharge pipe; 420, electric push rod; 430, air inlet pipe; 431, one-way valve. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Example 1, refer to Figures 1-4The utility model relates to an acrylic sheet hot bending setting device, which comprises a rack 100, a hydraulic rod 200 mounted on the top of the rack 100, an upper die 110 mounted on the output end of the hydraulic rod 200, a lower die 120 mounted on the lower part of the rack 100, a hole formed in the cylinder rod 210 of the hydraulic rod 200 and a pin rod 220 slidably connected through the hole, a pin cap of the pin rod 220 abutting against the inner wall of the hole, a first air pipe 230 and a second air pipe 240 connected with the hole on the cylinder rod 210, a lifting valve 231 arranged on the first air pipe 230, a pressure valve 241 arranged on the second air pipe 240, and a first pull rope 232 connected between the valve rod of the lifting valve 231 and the rack 100; a first hot runner 311 and a second hot runner 321 are respectively formed in the upper die 110 and the lower die 120; when the cylinder rod 210 extends to the length at which the first pull rope 232 is about to deform, the first pull rope 232 pulls the valve rod of the lifting valve 231 to close; before the first pull rope 232 deforms, the pin rod 220 slides on the cylinder rod 210 when the upper die 110 contacts the arc-shaped acrylic sheet, so that the flow rate of the heat-conducting oil flowing through the first hot runner 311 and the second hot runner 321 in unit time is increased.

[0024] In use, the deformed or just-made arc-shaped acrylic sheet is placed on the lower die 120, the hydraulic rod 200 is controlled to extend, the upper die 110 is lowered, the arc-shaped acrylic sheet is pressed to be set or the shape is recovered, the heat-conducting oil is introduced into the first hot runner 311 and the second hot runner 321 after the arc-shaped acrylic sheet is pressed on the lower die 120 by the upper die 110, so that the arc-shaped acrylic sheet can be easily set after being heated; During the lowering of the hydraulic rod 200, if the thickness of the arc-shaped acrylic sheet is low or the deformation degree is small, the cylinder rod 210 extends to the length at which the first pull rope 232 is about to deform, at this time, the valve rod of the lifting valve 231 is pulled by the first pull rope 232, the lifting valve 231 is closed, then the cylinder rod 210 continues to extend, the first pull rope 232 is deformed and lengthened, and the upper die 110 stops lowering after contacting the arc-shaped acrylic sheet, at this time, the cylinder rod 210 moves downward relative to the pin rod 220, the pin rod 220 pushes the air in the hole of the cylinder rod 210 to the second air pipe 240 to be discharged, until the pin rod 220 moves upward to the top of the hole, the hydraulic rod 200 stops extending after the cylinder rod 210 continues to extend to make the upper die 110 exert the required pressure on the arc-shaped acrylic sheet for setting, and the heat-conducting oil enters the first hot runner 311 and the second hot runner 321 at a low flow rate; If the arc-shaped acrylic plate is thicker or the deformation degree is higher, the upper die 110 will contact the arc-shaped acrylic plate before the first pull rope 232 is tightened to pull the valve rod of the pull valve 231, at which time the downward movement of the upper die 110 is blocked in advance, so that the pin rod 220 moves upward relative to the cylinder rod 210 when the pull valve 231 is not closed, so that the air in the hole of the cylinder rod 210 is discharged through the first air pipe 230, and the air discharged through the first air pipe 230 drives the flow rate of the heat conducting oil to increase in the subsequent transmission process, thereby strengthening the shaping heat of the deformed or thicker arc-shaped acrylic plate, facilitating the rapid shaping of the deformed or thicker arc-shaped acrylic plate; In the above, when the pull valve 231 is not closed, the presence of the pressure valve 241 on the second air pipe 240 ensures that the air in the hole of the cylinder rod 210 can flow into the first air pipe 230; After the time of hot bending shaping is reached, the source of heat conducting oil flowing into the first hot runner 311 and the second hot runner 321 changes to low-temperature heat conducting oil, so that the arc-shaped acrylic plate is cooled to harden and maintain the shape.

[0025] With reference to Figure 2 The end of the first air pipe 230 away from the cylinder rod 210 is communicated with a piston cylinder 250, the piston cylinder 250 is fixedly connected to the rack 100 and slidably connected with a piston rod 251 inside, the rack 100 is fixedly connected with a sliding switch 260, the end of the piston rod 251 is connected to the sliding sheet of the sliding switch 260, when the thickness or deformation degree of the arc-shaped acrylic plate is high, the sliding stroke of the pin rod 220 increases, so that the sliding distance of the sliding sheet driven by the piston rod 251 increases to increase the flow rate of the heat conducting oil.

[0026] The inner diameter of the piston cylinder 250 can be set according to actual needs, so that the sliding stroke of the piston rod 251 inside is changed, when the air in the hole of the cylinder rod 210 enters the piston cylinder 250, the piston rod 251 extends out of the piston cylinder 250, and the thicker the arc-shaped acrylic plate or the greater the deformation degree, the longer the sliding distance of the piston rod 251, so that the sliding distance of the sliding sheet of the sliding switch 260 is greater, thereby the flow rate of the heat conducting oil controlled by the sliding switch 260 is faster, so that the cooling speed of the heat conducting oil in the first hot runner 311 and the second hot runner 321 is slowed down, and a high-temperature state can be maintained.

[0027] With reference to Figure 5 The first hot runner 311 and the second hot runner 321 are respectively communicated with a first pipe 310 and a second pipe 320, and the first pipe 310 and the second pipe 320 are commonly communicated with a pump-in pipe 300.

[0028] The pump-in pipe 300 is connected to an external heat conducting oil supply, and a flow dividing valve is arranged at the connection between the pump-in pipe 300 and the first pipe 310 and the second pipe 320, so that the heat conducting oil can flow evenly to the first pipe 310 and the second pipe 320.

[0029] Reference Figure 5 A valve 330 is installed on the pump inlet pipe 300. A small motor 340 is fixedly connected to the valve 330. The output end of the small motor 340 is fixedly connected to the valve stem of the valve 330. When the sliding distance of the slide plate increases, the small motor 340 runs to increase the opening degree of the valve 330.

[0030] In this embodiment, the pumping speed of the hot oil pump 350 remains constant. The sliding switch 260 controls the operation of the small motor 340 to change the opening degree of the valve 330, thereby changing the flow rate of the heat transfer oil. The greater the sliding distance of the slider of the sliding switch 260, the greater the opening degree of the valve 330, and thus the greater the flow rate of the heat transfer oil.

[0031] Example 2, refer to Figure 2 The difference from Embodiment 1 is that a hot oil pump 350 is installed on the pump inlet pipe 300, and the pumping speed of the hot oil pump 350 increases when the sliding distance of the vane increases.

[0032] In this embodiment, no valve 330 is installed on the pump inlet pipe 300, and the sliding switch 260 directly controls the pumping speed of the hot oil pump 350. When the sliding distance of the sliding plate of the sliding switch 260 increases, the pumping speed of the hot oil pump 350 increases, thereby increasing the flow rate of the heat transfer oil.

[0033] In addition, in both Embodiment 1 and Embodiment 2, the heat transfer oil inlet of the pump inlet pipe 300 is provided with two branch pipes connected to it, and an electromagnetic three-way valve is provided at the connection between the two branch pipes and the pump inlet pipe 300. The two branch pipes are respectively connected to high-temperature heat transfer oil and low-temperature heat transfer oil. When the hot bending and shaping time reaches the set time, the electromagnetic three-way valve operates, which disconnects the branch pipe that flows into the high-temperature heat transfer oil, while the branch pipe that flows into the low-temperature heat transfer oil is unobstructed, thereby allowing the arc-shaped acrylic sheet to cool down and harden to maintain its required shape.

[0034] Example 3, referring to Figure 6 Based on Embodiment 1 and / or Embodiment 2, the lower mold 120 is further provided with a plurality of positioning blocks 130 arranged in a ring array. The plurality of positioning blocks 130 are all configured to be slidably connected to the lower mold 120 by a slider, and the plurality of positioning blocks 130 can slide synchronously to approach or move away from the center of the lower mold 120.

[0035] After the curved acrylic sheet to be shaped is placed in the lower mold 120, multiple positioning blocks 130 move closer to each other and can push the curved acrylic sheet to the middle position of the lower mold 120, so that the upper mold 110 can apply pressure to shape it. The thickness of the positioning block 130 is achieved by using a curved acrylic plate at the bottom, ensuring that the upper mold 110 can directly press against the curved acrylic plate without being blocked by the positioning block 130. If the arc-shaped acrylic plate deforms, the middle or edge of the arc-shaped acrylic plate will not be in close contact with the lower mold 120, and the middle or edge of the upper mold 110 will first contact the arc-shaped acrylic plate, thereby causing the relative sliding of the cylinder rod 210 and the pin rod 220.

[0036] With reference to Figure 6 The plurality of sliding blocks are fixedly connected with the springs 140 between the plurality of sliding blocks and the lower mold 120, and the lower mold 120 is fixedly connected with the electric telescopic rod 170, and the electric telescopic rod 170 is connected with the plurality of positioning blocks 130 through the second pull ropes 150.

[0037] The electric telescopic rod 170 can pull or release the second pull ropes 150 when the electric telescopic rod 170 is extended or retracted, the plurality of second pull ropes 150 are equal in length, and the corresponding positioning blocks 130 are synchronously pulled, so that the plurality of positioning blocks 130 are synchronously away from each other, and after the plurality of second pull ropes 150 are synchronously released, the plurality of positioning blocks 130 can be synchronously close to the arc-shaped acrylic plate to position the arc-shaped acrylic plate.

[0038] With reference to Figure 6 The lower mold 120 is provided with the guide wheels 160 corresponding to the plurality of second pull ropes 150 in a ring array, and the plurality of second pull ropes 150 are respectively wound around the plurality of guide wheels 160.

[0039] The guide wheels 160 change the pulling direction of the second pull ropes 150, and the displacement sensor for detecting the sliding of the pin rod 220 is further arranged on the cylinder rod 210, when the sliding of the pin rod 220 is detected, the system controls the electric telescopic rod 170 to be shortened, so that the plurality of positioning blocks 130 are away from the arc-shaped acrylic plate, and the shape correction of the arc-shaped acrylic plate is not affected.

[0040] With reference to Figure 7 The first hot runner 311 and the second hot runner 321 are respectively communicated with the first return pipe 312 and the second return pipe 322, the upper mold 110 is fixedly connected with the containing box 400, the first return pipe 312 and the second return pipe 322 are both communicated with the containing box 400, and the flow of the heat-conducting oil to the containing box 400 can increase the pressure applied by the upper mold 110 to the arc-shaped acrylic plate.

[0041] After the heat-conducting oil provides heat for the shaping of the arc-shaped acrylic plate, the heat-conducting oil returns to the containing box 400 from the first return pipe 312 and the second return pipe 322, so that the weight of the containing box 400 gradually increases, meeting the requirement of gradually increasing the pressure during the shaping of the arc-shaped acrylic plate, and without the need for additional control of the hydraulic rod 200 to be elongated again.

[0042] With reference to Figure 7The air inlet pipe 430 is fixedly connected with the containing box 400, the discharge pipe 410 is axially slidably connected with the containing box 400, the air inlet pipe 430 is provided with a one-way valve 431, the containing box 400 is fixedly connected with an electric push rod 420, the output end of the electric push rod 420 is fixedly connected with the discharge pipe 410, the electric push rod 420 can drive the length of the discharge pipe 410 inserted into the containing box 400 to change when the electric push rod 420 is extended or retracted, so as to adjust the amount of heat conducting oil in the containing box 400.

[0043] For the shaping of the arc-shaped acrylic plate with different thicknesses or deformation degrees, the electric push rod 420 is controlled to be extended or retracted, so that the depth of the discharge pipe 410 inserted into the containing box 400 is changed, a sealing ring is arranged between the discharge pipe 410 and the containing box 400, the one-way valve 431 is arranged so that air can only enter through the air inlet pipe 430, so that the liquid level of the heat conducting oil in the containing box 400 is at the port of the discharge pipe 410 in the containing box 400, so as to adjust the additional pressure required for the arc-shaped acrylic plate with different thicknesses and deformation degrees to recover.

[0044] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for hot bending and shaping acrylic sheet, comprising a frame (100), a hydraulic rod (200) mounted on the top of the frame (100), an upper mold (110) mounted on the output end of the hydraulic rod (200), and a lower mold (120) mounted on the lower part of the frame (100), characterized in that: The hydraulic rod (200) is provided with a hole in the cylinder rod (210), and a pin rod (220) is connected with the hole through sliding connection, the pin cap of the pin rod (220) is attached to the inner wall of the hole, the cylinder rod (210) is connected with a first air pipe (230) and a second air pipe (240) which are in communication with the hole, the first air pipe (230) is provided with a pull valve (231), the second air pipe (240) is provided with a pressure valve (241), and the valve rod of the pull valve (231) is connected with the rack (100) through the first pull rope (232). The upper die (110) and the lower die (120) are respectively provided with a first hot runner (311) and a second hot runner (321), when the cylinder rod (210) is stretched to the length where the first pull rope (232) is about to be deformed, the first pull rope (232) pulls the pull valve (231) to close, before the first pull rope (232) is deformed, when the upper die (110) contacts the arc-shaped acrylic plate, the pin rod (220) slides on the cylinder rod (210), so that the flow of heat conducting oil flowing through the first hot runner (311) and the second hot runner (321) per unit time is increased.

2. The apparatus according to claim 1, wherein: The end of the first air pipe (230) away from the cylinder rod (210) is communicated with a piston cylinder (250), the piston cylinder (250) is fixedly connected to the rack (100) and is internally connected with a piston rod (251) through sliding connection, the rack (100) is fixedly connected with a sliding switch (260), the end of the piston rod (251) is connected to the sliding sheet of the sliding switch (260), when the thickness or deformation degree of the arc-shaped acrylic plate is high, the sliding stroke of the pin rod (220) is increased, so that the sliding distance of the piston rod (251) driven sliding sheet is increased to increase the flow of heat conducting oil.

3. The apparatus according to claim 2, wherein: The first hot runner (311) and the second hot runner (321) are respectively communicated with a first pipeline (310) and a second pipeline (320), and the first pipeline (310) and the second pipeline (320) are commonly communicated with a pump-in pipe (300).

4. The apparatus according to claim 3, wherein the heating means is a heating plate. The pump-in pipe (300) is installed with a valve (330), the valve (330) is fixedly connected with a small motor (340), the output end of the small motor (340) is fixedly connected to the valve rod of the valve (330), when the sliding distance of the sliding sheet is increased, the small motor (340) operates to increase the opening degree of the valve (330).

5. The apparatus according to claim 3, wherein the heating means is a heating plate. The pump-in pipe (300) is installed with a heat oil pump (350), when the sliding distance of the sliding sheet is increased, the pump speed of the heat oil pump (350) is increased.

6. The apparatus according to claim 1, wherein: The lower die (120) is annularly arranged with a plurality of positioning blocks (130), the plurality of positioning blocks (130) are all arranged to be connected to the lower die (120) through sliding blocks, and the plurality of positioning blocks (130) can be synchronously slid to approach or move away from the middle part of the lower die (120).

7. The apparatus according to claim 6, wherein the heating means is a heating plate. A plurality of the sliders are fixedly connected with springs (140) between the lower mold (120), the lower mold (120) is fixedly connected with an electric telescopic rod (170), and the electric telescopic rod (170) is connected with a plurality of the positioning blocks (130) through second pull ropes (150).

8. The apparatus according to claim 7, wherein the heating means is a heating plate. The lower mold (120) is provided with guide wheels (160) corresponding to the plurality of second pull ropes (150) in an annular array, and the plurality of second pull ropes (150) are respectively wound around the plurality of guide wheels (160).

9. The apparatus according to claim 1, wherein the apparatus is characterized by: The first hot runner (311) and the second hot runner (321) are respectively communicated with first return pipes (312) and second return pipes (322), the upper mold (110) is fixedly connected with a containing box (400), the first return pipes (312) and the second return pipes (322) are communicated with the containing box (400), and when the heat conducting oil flows to the containing box (400), the pressure of the upper mold (110) applied to the arc-shaped acrylic plate can be increased.

10. The apparatus according to claim 9, wherein the heating means is a heating plate. The containing box (400) is communicated with an air inlet pipe (430) and a discharge pipe (410), the air inlet pipe (430) is fixedly connected with the containing box (400), the discharge pipe (410) is axially slidably connected with the containing box (400), the air inlet pipe (430) is provided with a one-way valve (431), the containing box (400) is fixedly connected with an electric push rod (420), an output end of the electric push rod (420) is fixedly connected with the discharge pipe (410), and when the electric push rod (420) is extended or retracted, the length of the discharge pipe (410) extending into the containing box (400) can be driven, so that the amount of heat conducting oil contained in the containing box (400) can be adjusted.

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