Density-controllable plastic sheet extruding device

Abstract

The utility model belongs to the technical field of plastic sheet extruding machines, and particularly relates to a density-controllable plastic sheet extruding device which comprises a machine box, a heating box is fixedly connected to the upper surface of the machine box, a discharging bin is connected to the upper portion of the heating box, an extruding pipe is connected to the right side of the heating box, and a cold water pool is arranged on the right side of the machine box. A plastic sheet extruding mechanism is arranged in the cold water tank and comprises a roller spacing adjusting unit and a heat dissipation unit; and the roller spacing adjusting unit comprises a movable extrusion roller, a transmission part II and the like. According to the density-controllable plastic sheet extruding device, the two ends of the air cylinder are rotationally connected to the cold water pool and the circular sliding block respectively, and the circular sliding block is driven to slide in the arc-shaped sliding groove, so that the position of the movable extruding roller is accurately adjusted. And meanwhile, the four gears are meshed, so that the rotating power output by the motor II can be smoothly and efficiently transmitted to the moving extrusion roller and the directional extrusion roller, and the moving extrusion roller and the directional extrusion roller can synchronously rotate at a coordinated and consistent rotating speed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plastic sheet extruding machine, concretely to a density controllable plastic sheet extruding device. BACKGROUND

[0002] The plastic sheet extruding machine extrudes plastic into sheet material through electric heating. Generally, customers have requirements for the thickness of plastic sheet material. The extruded sheet material needs to be extruded into a certain thickness by a tablet press. The extruded sheet material is cooled and coiled into a finished product. Although the thickness of the plastic sheet material extruded by the sheet extruding machine is the same, the density distribution of the extruded sheet material is not uniform due to the uneven feeding of the sheet extruding machine, which affects the product quality because the weight distribution of the plastic sheet material is different. However, there is no device in the existing equipment to detect the uniformity of the density of the plastic sheet material, so it is impossible to control the production of products with uniform density.

[0003] A plastic sheet extruding device with controllable density is disclosed in Chinese Patent No. CN207874818U, which includes a sheet extruding machine, a tablet press, a water tank, a water cooling pipeline, and a sheet discharging machine. The discharge end of the sheet extruding machine is arranged opposite to the head of the tablet press. The head of the tablet press is provided with a compression roller. The water tank is installed on the tablet press. The water tank is provided with an overflow port. The overflow port is provided with a hidden groove below. The bottom of the water tank is provided with a water inlet. The bottom of the hidden groove is provided with a water outlet. The compression roller, the water inlet, and the water outlet are respectively connected to the water cooling pipeline by a hose. The tail of the tablet press is connected to the sheet discharging machine. The sheet discharging machine is provided with a deviation correcting device.

[0004] The above technical solution has the following defects: the staff needs to observe the water mark changes in real time and adjust the feeding amount of the sheet extruding machine, which may affect the production efficiency. If the observation and adjustment are not timely, it may lead to the production of unqualified sheet material, increasing the scrap rate. In the above technical solution, the fixed-pitch compression roller can only produce plastic sheets of a specific thickness, and cannot meet the production needs of different thickness products.

[0005] Therefore, we propose a density controllable plastic sheet extruding device to solve the above problems. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at providing a density controllable plastic sheet extruding device to solve the problems of affecting production efficiency by observing water mark changes with the naked eye and being unable to adjust the roller pitch as mentioned in the background.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a density controllable plastic sheet extruding device, including a machine case, the upper surface of the machine case is fixedly connected with a heating box, the heating box upper side is connected with a feeding bin, the right side of the heating box is connected with an extrusion pipe, the right side of the machine case is provided with a cold water pool, the inside of the cold water pool is provided with a plastic sheet extruding mechanism, the plastic sheet extruding mechanism includes a roller pitch adjusting unit and a heat dissipation unit.

[0008] The roller spacing adjusting unit comprises a directional extrusion roller, a transmission member two, a motor two, a connecting rod, a directional extrusion roller, an arc-shaped sliding groove and a circular sliding block, both ends of the directional extrusion roller are rotationally connected to the inside of the cold water pool through shafts, both ends of the directional extrusion roller are rotationally connected to the middle of the circular sliding block through shafts, the circular sliding block is slidingly connected to the arc-shaped sliding groove, the arc-shaped sliding groove is arranged on the two sides of the cold water pool, a gas cylinder is connected to the outside of the circular sliding block, the output end of the motor is connected to the transmission member two, the transmission member two comprises four gears, two gears of the transmission member two are respectively connected to two shafts, and the other two gears are respectively meshingly connected to two gears, and the connecting rod is connected between the gears.

[0009] Preferably, the heat dissipation unit comprises a heat conduction base, a heat conduction sheet, a heat conduction strip, a support frame and a heat dissipation fan, the back of the heat conduction base is fixedly connected to the front of the cold water pool, one end of the heat conduction strip is fixedly connected to the heat conduction base, the heat conduction sheet is connected to the heat conduction strip, the support frame is fixedly connected to the left side of the heat conduction base, and the heat dissipation fan is connected to the inside of the support frame. The heat conduction base and the heat conduction strip are made of aluminum nitride material with high thermal conductivity, which can quickly transfer the heat in the cold water pool to the heat dissipation fan for heat dissipation.

[0010] Preferably, a connecting roller is fixedly connected to the inside of the cold water pool, the extruded plastic sheet passes through the connecting roller and then is transported outward through the guide roller, so that the plastic sheet can be completely cooled by the cold water.

[0011] Preferably, a support rod is fixedly connected to the upper right side of the cold water pool, and an infrared spectrometer is fixedly connected to the lower side of the support rod. Infrared spectrum analysis is based on the absorption and transmission characteristics of substances to infrared light. When infrared light passes through a substance, the molecules or atomic groups in the substance will absorb infrared light with a frequency matching their vibration or rotation frequency, thereby generating specific absorption peaks. The position, shape and intensity of these absorption peaks can reflect the presence of chemical bonds and functional groups in the substance, and further infer the chemical composition and structure of the substance. By comparing the infrared spectra of samples at different positions, the differences in chemical bonds and functional groups in the samples can be analyzed, so as to judge the uniformity of the chemical structure.

[0012] Preferably, a discharging structure is arranged on the right side of the cold water pool, the discharging structure comprises a support frame, a guide roller, a transmission member one and a motor one, the support frame is fixedly connected to the right side of the cold water pool, the guide roller is rotationally connected to the support frame through a shaft, the transmission member one is connected to the shaft, and the output end of the motor one is connected to the transmission member one through a shaft coupling. The motor one drives the transmission member one, and then drives the guide roller to rotate, thereby realizing the automatic discharging of the plastic sheet.

[0013] Preferably, the transmission member is driven by two gear engagement, the gear engagement transmission mode makes the transmission more stable and reliable, reduces the noise and vibration in the transmission process.

[0014] Preferably, the heat-conducting base and the heat-conducting strip are made of high-thermal-conductivity aluminum nitride material, the high-thermal-conductivity aluminum nitride material ensures that the heat can be quickly transmitted and taken away by the cooling fan, thereby effectively reducing the water temperature in the cold water pool.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1. The density-controllable plastic sheet extruding device, the two ends of the cylinder are respectively rotationally connected to the cold water pool and the circular slide block, the accurate adjustment of the position of the dynamic extruding roller is realized by driving the sliding of the circular slide block in the arc-shaped sliding groove. Meanwhile, the rotation power output by the second motor can be smoothly and efficiently transmitted to the dynamic extruding roller and the directional extruding roller through the engagement between the four gears, so that the two rollers can synchronously rotate at a coordinated speed.

[0017] 2. The density-controllable plastic sheet extruding device, the heat-conducting base and the heat-conducting strip are made of high-thermal-conductivity aluminum nitride material, the heat in the cold water pool can be quickly transmitted to the cooling fan for heat dissipation, the water temperature in the cold water pool is effectively reduced, and the stability and quality of the plastic sheet in the cooling process are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is an overall front structure schematic view of the utility model;

[0019] Figure 2 It is an overall back structure schematic view of the utility model;

[0020] Figure 3 It is an overall top view structure schematic view of the utility model;

[0021] Figure 4 It is a roller spacing adjustment structure schematic view of the utility model.

[0022] In the drawing: 1, case, 201, heating box, 202, feeding bin, 203, extruding pipe, 3, cold water pool, 301, arc-shaped sliding groove, 302, circular slide block, 4, support frame, 401, guide roller, 402, transmission member one, 403, motor one, 501, heat-conducting base, 502, heat-conducting sheet, 503, heat-conducting strip, 504, support frame, 505, cooling fan, 601, support rod, 602, infrared spectrometer, 701, dynamic extruding roller, 702, transmission member two, 703, motor two, 704, connecting rod, 705, directional extruding roller, 8, connecting roller. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0024] Embodiment one:

[0025] In the production process, the distance between the rollers needs to be adjusted to produce plastic sheets of different thicknesses. When plastic sheets of different thicknesses are needed, the entire sheet press or the press rollers may need to be replaced, increasing production costs and complexity. To solve this problem, please refer to Figures 1-4 The present application provides a technical solution: a density-controllable plastic sheet extrusion device, comprising a case 1, the upper surface of the case 1 is fixedly connected with a heating box 201, the heating box 201 is connected with a feeding bin 202 above, and the right side of the heating box 201 is connected with an extrusion pipe 203. The plastic raw material is preheated to soften and be easily extruded, improving the extrusion efficiency and the quality of the finished product. The right side of the case 1 is provided with a cold water pool 3, and the inside of the cold water pool 3 is provided with a plastic sheet extrusion mechanism. The plastic sheet extrusion mechanism comprises a roller spacing adjusting unit and a heat dissipation unit.

[0026] The roller spacing adjusting unit comprises a directional extrusion roller 701, a transmission member two 702, a motor two 703, a connecting rod 704, a directional extrusion roller 705, an arc-shaped sliding groove 301 and a circular sliding block 302. The two ends of the directional extrusion roller 705 are rotatably connected to the inside of the cold water pool 3 through shafts, and the two ends of the directional extrusion roller 701 are rotatably connected to the middle part of the circular sliding block 302 through shafts. By adjusting the distance and controlling the pressure, the extruded plastic sheet is further flattened and shaped. The circular sliding block 302 is slidingly connected to the arc-shaped sliding groove 301, and the arc-shaped sliding groove 301 is opened on both sides of the cold water pool 3. The outer side of the circular sliding block 302 is connected with a cylinder, and the output end of the motor is connected with the transmission member two 702. The transmission member two 702 comprises four gears, two gears of which are connected to two shafts, and the other two gears are meshed with two gears. The connecting rod 704 has two connecting rods between the gears, allowing the directional extrusion roller to move in the arc-shaped sliding groove 301 to adjust the roller spacing and adapt to the production requirements of plastic sheets of different thicknesses.

[0027] Embodiment two:

[0028] In the subsequent processing stage of the plastic sheet extrusion, the cooling water continuously absorbs a large amount of heat from the plastic sheet during the cooling process. In order to effectively dissipate the accumulated heat and maintain the appropriate temperature of the cooling water, a heat dissipation unit is further provided on the basis of Embodiment One. The heat dissipation unit includes a heat-conducting base 501, heat-conducting sheets 502, heat-conducting strips 503, a support frame 504, and a heat dissipation fan 505. The heat-conducting base 501 is fixedly connected to the front of the cold water pool 3. One end of the heat-conducting strip 503 is fixedly connected to the heat-conducting base 501. The heat-conducting sheets 502 are connected to the heat-conducting strips 503. The heat-conducting base 501 and the heat-conducting strips 503 are made of aluminum nitride material with high thermal conductivity, effectively conducting heat out of the cold water pool and preventing the water temperature from being too high to affect the cooling effect. The support frame 504 is fixedly connected to the left side of the heat-conducting base 501, and the heat dissipation fan 505 is connected to the inside of the support frame 504. The connecting roller 8 is fixedly connected to the inside of the cold water pool 3. The support rod 601 is fixedly connected to the right side of the cold water pool 3, and the infrared spectrometer 602 is fixedly connected below the support rod 601. The infrared spectrometer 602 is used to monitor the temperature and quality of the plastic sheet in real time, ensuring the stability of the extrusion process and the quality of the product. The support rod 601 provides a stable mounting position for the infrared spectrometer 602.

[0029] In order to ensure that the plastic sheet after cooling treatment can be stably, continuously and efficiently transported to the outside, the discharge structure is provided on the right side of the cold water pool 3. The discharge structure includes a support frame 4, guide rollers 401, a transmission member 402, and a motor 403. The support frame 4 is fixedly connected to the right side of the cold water pool 3. The guide rollers 401 are rotatably connected between the support frames 4 through shafts. The transmission member 402 is connected to the shafts. The output end of the motor 403 is connected to the transmission member 402 through a coupling. The transmission member 402 is driven by two gears to guide and transport the cooled and shaped plastic sheet, ensuring that the finished product can smoothly leave the cold water pool.

[0030] Working principle: The plastic raw material enters the heating box 201 through the feeding bin 202 and is preheated in the heating box to soften and facilitate extrusion. The preheated plastic raw material is extruded through the extrusion pipe 203 to form a preliminary plastic sheet. The extruded plastic sheet enters the cold water pool 3 and is cooled and shaped by the action of cold water.

[0031] When the distance between the rollers needs to be adjusted, the air cylinder is started, which serves as the power source, and its output end pushes the circular slider 302 to slide in the arc-shaped sliding groove 301, thereby moving the direction extrusion roller and the fixed extrusion roller to the desired position. By adjusting the roller distance and controlling the pressure, the production requirements of plastic sheets of different thicknesses can be met. Motor two 703 transmits rotary power to the direction extrusion roller 701 and the fixed extrusion roller 705 through transmission member two 702. The meshing between the four gears ensures that the power is transmitted smoothly and efficiently. The direction extrusion roller 701 and the fixed extrusion roller 704 rotate at a coordinated speed under the drive of the motor 703, extruding and shaping the plastic. The infrared spectrometer 602 monitors the temperature and quality of the plastic sheet in real time. The infrared spectrometer 602 mainly monitors the quality of the plastic sheet based on the principle of molecular vibration absorption spectrum. Different chemical structures of molecules have specific vibration modes. When infrared light shines on the plastic sheet, the molecules will absorb infrared light of a specific frequency, forming characteristic absorption peaks on the infrared spectrum. For a plastic sheet, its quality includes multiple key indicators. In terms of chemical composition, by analyzing the position and intensity of the characteristic absorption peaks in the infrared spectrum, the type of plastic can be accurately determined, such as polyethylene, polypropylene, or polyvinyl chloride, etc. At the same time, it can also detect whether there are additives and impurities in the plastic sheet and their content. If there are unknown absorption peaks, it indicates that there may be impurities, and according to the absorption peak intensity, the content of impurities can be roughly estimated. In terms of molecular structure, the infrared spectrometer 602 can sensitively detect changes in the molecular chain structure of the plastic sheet. The plastic sheet may be broken, cross-linked, or the crystallinity may change during the production process due to factors such as heat and stress. These microscopic structural changes will directly reflect on the characteristic peaks of the infrared spectrum. Changes in crystallinity will change the intensity and position of some characteristic peaks. Technical personnel can timely grasp the stability of the molecular structure of the plastic sheet by accurately analyzing these changes, and then evaluate its quality. In addition, if the quality of the plastic sheet fluctuates during production, the infrared spectrometer 602 will quickly capture the relevant signal changes and feed back to the operator in a timely manner. Based on these data, the operator can quickly adjust the production parameters to ensure the stability of the plastic sheet quality and the stability of the extrusion process and product quality.

[0032] The heat dissipation unit includes a heat-conducting base 501, heat-conducting sheets 502, heat-conducting strips 503, a support frame 504, and a heat dissipation fan 505. These components work together to conduct heat out of the cold water pool, preventing the water temperature from being too high and affecting the cooling effect. The cooled and shaped plastic sheet is guided and transported by the guide rollers 401 in the discharge structure. Motor one 403 drives the guide rollers 401 to rotate through transmission member one 402, ensuring that the finished product can smoothly leave the cold water pool.

[0033] It is to be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component" can include a combination of two or more components. Additionally, the terms "comprise," "comprises," and "comprising," or any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, unless otherwise indicated herein, the terms "first," "second," "third," etc., are used herein merely as labels, and are not intended to impose ordinal import.

Claims

1. A device for the controlled density extrusion of plastic sheets, comprising a cabinet (1), characterized in that: The upper surface of the cabinet (1) is fixedly connected with a heating box (201), the upper portion of the heating box (201) is connected with a feeding bin (202), the right side of the heating box (201) is connected with an extrusion pipe (203), the right side of the cabinet (1) is provided with a cold water pool (3), and the inside of the cold water pool (3) is provided with a plastic extrusion mechanism. The roller spacing adjusting unit comprises a directional extrusion roller (701), a transmission member two (702), a motor two (703), a connecting rod (704), a directional extrusion roller (705), an arc-shaped sliding groove (301) and a circular sliding block (302), the two ends of the directional extrusion roller (705) are rotatably connected to the inside of the cold water pool (3) through shafts, the two ends of the directional extrusion roller (701) are rotatably connected to the middle portion of the circular sliding block (302), the circular sliding block (302) is slidably connected to the arc-shaped sliding groove (301), the arc-shaped sliding groove (301) is arranged on the two sides of the cold water pool (3), the outside of the circular sliding block (302) is connected with an air cylinder, the output end of the motor two is connected to the transmission member two (702), the transmission member two (702) comprises four gears, two gears thereof are connected to two shafts respectively, and the other two gears are meshedly connected to two gears respectively, and the connecting rod (704) has two connecting rods connected between the gears.

2. A density controllable plastic sheet extrusion device according to claim 1, characterized in that: The heat dissipation unit comprises a heat conduction base (501), a heat conduction sheet (502), a heat conduction strip (503), a supporting frame (504) and a heat dissipation fan (505), the back surface of the heat conduction base (501) is fixedly connected to the front surface of the cold water pool (3), one end of the heat conduction strip (503) is fixedly connected to the heat conduction base (501), the heat conduction sheet (502) is connected to the heat conduction strip (503), the supporting frame (504) is fixedly connected to the left side of the heat conduction base (501), and the heat dissipation fan (505) is connected to the inside of the supporting frame (504).

3. A controlled density plastic sheet extrusion apparatus as claimed in claim 1 wherein: The inside of the cold water pool (3) is fixedly connected with a connecting roller (8).

4. A controlled density plastic sheet extrusion apparatus as claimed in claim 1 wherein: The upper right side of the cold water pool (3) is fixedly connected with a supporting rod (601), and the lower side of the supporting rod (601) is fixedly connected with an infrared spectrometer (602).

5. A controlled density plastic sheet extrusion apparatus as claimed in claim 1, wherein: The right side of the cold water pool (3) is provided with an outlet structure, the outlet structure comprises a supporting frame (4), a guide roller (401), a transmission member one (402) and a motor one (403), the supporting frame (4) is fixedly connected to the right side of the cold water pool (3), the guide rollers (401) are rotatably connected to the supporting frame (4) through shafts respectively, the transmission member one (402) is connected to the shaft, and the output end of the motor one (403) is connected to the transmission member one (402) through a shaft coupling.

6. A density controllable plastic sheet extrusion device according to claim 5, wherein: The transmission member one (402) is driven through two gears.

7. A controlled density plastic sheet extrusion apparatus as claimed in claim 2, wherein: The heat conduction base (501) and the heat conduction strip (503) are made of high-thermal-conductivity aluminum nitride material.

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