Shaping equipment for polyolefin sheet forming

Abstract

The invention discloses shaping equipment for polyolefin sheet forming, the shaping equipment comprises a supporting mechanism, and a front roller mechanism, a middle roller mechanism and a rear roller mechanism which are mounted on the supporting mechanism, the front roller mechanism comprises a front roller and a first cooling assembly on the front side of the front roller, and the first cooling assembly comprises a first cooling roller moving back and forth; the middle roller mechanism comprises a middle roller, the rear roller mechanism comprises a rear roller and a front roller, the middle roller and the rear roller extend in the left-right direction, the axes of the middle roller and the rear roller are flush in the front-back direction, the axis of the first cooling roller is located above the axis of the front roller, the front roller and the middle roller can rotate around the axes of the front roller and can move in the front-back direction, and the middle roller can only rotate around the axis of the middle roller. At least one cooling assembly is installed below each of the front roller, the middle roller and the rear roller. Each cooling assembly is provided with a cooling roller moving in the vertical direction. The multiple sets of cooling assemblies can independently adjust the distance between the multiple sets of cooling assemblies and the corresponding rollers according to the actual moving direction and cooling requirements of the sheets, accurate cooling is achieved, and the sizing quality is improved.

Description

Technical Field

[0001] This application relates to the field of polymer material processing equipment technology, and in particular to a shaping device for forming polyolefin sheets. Background Technology

[0002] After extrusion molding, polyolefin sheets (such as PP and PE sheets) need to be cooled and shaped by a sizing machine to obtain stable dimensions and good surface quality. If the cooling is uneven or the stress control is inadequate, the sheets are prone to warping, internal stress concentration, and dimensional instability. Currently, most sheet sizing machines in China use three-roll sizing equipment for pressure molding. The temperature of the front roller surface is difficult to cool, resulting in poor polyolefin sheet molding effect. Furthermore, due to the poor cooling effect of each roller, the polyolefin sheet sizing efficiency is low and the sizing effect is poor. In addition, this type of equipment lacks the flexibility to adjust when dealing with sheets of different thicknesses, materials, or process requirements, making it difficult to achieve precise and independent coordinated control. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the purpose of this application is to provide a shaping device for polyolefin sheet forming that has uniform cooling, good cooling effect and flexible adjustment.

[0004] To achieve the above objectives, this application adopts the following technical solution: a shaping device for polyolefin sheet forming, comprising:

[0005] The support mechanism includes a frame and a movable component mounted on the bottom of the frame, the frame being able to move back and forth in the front-to-back direction via the movable component;

[0006] A front roller mechanism includes a front roller extending in a left-right direction, a first cooling assembly mounted on the front side of the front roller, and at least one second cooling assembly mounted below the front roller. The front roller is mounted on the top of the frame in a way that allows it to rotate about its own axis and move in a front-back direction. The first cooling assembly includes a first cooling roller that can move in a front-back direction, and the second cooling assembly includes a second cooling roller that can move in a vertical direction.

[0007] A middle roller mechanism, arranged behind the front roller mechanism, includes a middle roller parallel to the front roller and at least one third cooling assembly mounted below the middle roller. The middle roller is rotatably mounted on the top of the frame. The third cooling assembly includes a third cooling roller movable in a vertical direction.

[0008] The rear roller mechanism is arranged behind the middle roller mechanism. The rear roller mechanism includes a rear roller parallel to the front roller and at least one fourth cooling assembly installed below the rear roller. The rear roller is mounted on the top of the frame and can rotate about its own axis and move in the front-back direction. The fourth cooling assembly includes a fourth cooling roller that can move in the up-down direction.

[0009] The centerlines of the front roller, the middle roller, and the rear roller are aligned in the front-to-back direction, and the centerline of the first cooling roller is located above the centerline of the front roller.

[0010] In the above technical solution, more preferably, sliding bearing seats are respectively installed at both ends of the front roller and the rear roller, and fixed bearing seats are respectively installed at both ends of the middle roller; a sliding assembly is connected between each sliding bearing seat and the top of the frame, the sliding assembly including a slider installed at the bottom of the sliding bearing seat and a slide rail installed at the top of the frame, the slide rail extending in the front-rear direction, and the slider slidingly engaging with the slide rail; the fixed bearing seat is fixedly installed at the top of the frame.

[0011] In the above technical solution, it is further preferred that each of the sliding bearing seats is equipped with a pressing cylinder, and each of the pressing cylinders is used to drive the corresponding sliding bearing seat to move in the front-back direction. A pair of pressing cylinders connected to the sliding bearing seats at both ends of the front roller are arranged on the front side of the front roller, and a pair of pressing cylinders connected to the sliding bearing seats at both ends of the rear roller are arranged on the rear side of the rear roller. Each of the pressing cylinders is fixedly installed on the top of the frame.

[0012] In the above technical solution, it is further preferred that one end of the front roller is driven by a first drive motor to rotate around its own axis under the drive of the first drive motor, one end of the middle roller is driven by a second drive motor to rotate around its own axis under the drive of the second drive motor, and one end of the rear roller is driven by a third drive motor to rotate around its own axis under the drive of the third drive motor. The first drive motor, the second drive motor and the third drive motor are arranged on the same side of the frame.

[0013] In the above technical solution, it is further preferred that a first quick-release connecting plate is connected between the front roller and the first drive motor, and a second quick-release connecting plate is connected between the middle roller and the second drive motor.

[0014] In the above technical solution, a further preferred embodiment is that the first drive motor and the first quick-release connecting plate are slidably supported on one side of the frame in the front-rear direction by a sliding support assembly. The sliding support assembly includes a fixed bracket, a connecting bracket, an auxiliary sliding block, and an auxiliary guide rail. The fixed bracket is fixedly installed on the outside of the frame and extends outward. The connecting bracket is supported below the connection point of the first drive motor and the first quick-release connecting plate. The auxiliary guide rail extends in the front-rear direction and is fixed on the fixed bracket. The auxiliary sliding block is fixed to the bottom of the connecting bracket, and the auxiliary sliding block slides in cooperation with the auxiliary guide rail.

[0015] In the above technical solution, it is further preferred that the first cooling roller is mounted on the front side of the front roller by means of a pair of drive cylinders that can move back and forth, the pair of drive cylinders being arranged opposite each other and fixed to the top of the frame.

[0016] In the above technical solution, it is further preferred that the second cooling roller, the third cooling roller and the fourth cooling roller are each equipped with a lifting cylinder, so as to move in the vertical direction under the drive of the corresponding lifting cylinder.

[0017] In the above technical solution, a further preferred embodiment is that a gap adjustment device is installed between each of the sliding bearing seats and the fixed bearing seats. The gap adjustment device includes a dial indicator and a handwheel for operation, and the handwheel is arranged inclined towards the outside of the frame.

[0018] In the above technical solution, it is further preferred that the diameter of the front roller is smaller than the diameter of the middle roller and the rear roller, and the diameters of the first cooling roller, the second cooling roller, the third cooling roller and the fourth cooling roller are all smaller than the diameter of the front roller.

[0019] Compared with the prior art, this application achieves the following beneficial effects:

[0020] This application allows for flexible adjustment of the thickness between the front and rear rollers through their forward and backward movement, adapting to the production of products with different thicknesses and processes. The multiple cooling components effectively improve the cooling efficiency and effect of the front roller, thereby enhancing the initial forming effect and forming efficiency of the sheet. Furthermore, the distance between the sheet and the corresponding roller can be independently adjusted according to the actual direction of the sheet and cooling requirements, achieving precise cooling in zones, stages, and asymmetry, effectively controlling sheet shrinkage and deformation, and improving the shaping quality. Attached Figure Description

[0021] Figure 1 A three-dimensional structural diagram of a shaping device for polyolefin sheet forming provided in an embodiment of this application;

[0022] Figure 2 for Figure 1 The main view of the finalized equipment in the middle;

[0023] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0024] Figure 4 for Figure 1 Top view of the finalized equipment in the middle;

[0025] Figure 5 for Figure 4 A magnified view of a portion of point B in the middle.

[0026] The components are as follows: 100. Shaping equipment; 10. Support mechanism; 11. Frame; 111. Wall panel; 112. Connecting beam; 113. Base frame; 12. Moving component; 121. Base; 122. Guide rail; 123. Rack; 124. Moving wheel; 125. Lifting platform; 126. Moving slider; 20. Front roller mechanism; 2. Front roller; 51. Sliding bearing seat; 53. Sliding component; 531. Slider; 532. Slide rail; 54. First hydraulic cylinder; 61. First cooling component; 611. First cooling roller; 612. Drive cylinder; 62. Second cooling component; 621. Second cooling roller; 622. First lifting cylinder; 71. 74. First drive motor; 8. First quick-release connecting plate; 9. Sliding support assembly; 10. Fixed bracket; 11. Connecting bracket; 12. Auxiliary sliding block; 13. Auxiliary guide rail; 14. Gap adjustment device; 15. Dial indicator; 16. Handwheel; 17. Middle roller mechanism; 18. Middle roller; 19. Fixed bearing seat; 10. Third cooling assembly; 11. Third cooling roller; 12. Second lifting cylinder; 13. Second drive motor; 14. Second quick-release connecting plate; 15. Rear roller mechanism; 16. Rear roller; 17. Second oil cylinder; 18. Fourth cooling assembly; 19. Fourth cooling roller; 10. Third lifting cylinder; 11. Third drive motor. Detailed Implementation

[0027] To illustrate the technical content, structural features, achieved objectives, and effects of the application in detail, the technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. In the following description, for illustrative purposes, numerous specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in one or more equivalent arrangements. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, the specific shape, structure, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0028] This application provides a shaping device for polyolefin sheet forming, such as... Figure 1 As shown, the shaping equipment 100 includes a support mechanism 10 and a front roller mechanism 20, a middle roller mechanism 30 and a rear roller mechanism 40 mounted on the support mechanism 10.

[0029] The support mechanism 10 includes a frame 11 and a movable component 12 installed at the bottom of the frame 11. Through the movable component 12, the entire frame 11 can move back and forth in the front and rear directions, which facilitates the positioning of the equipment and its docking with the production line.

[0030] like Figure 1 , 2 As shown, the frame 11 includes a pair of wall panels 111 arranged opposite each other, a plurality of connecting beams 112 connected between the pair of wall panels 111, and a base frame 113 connected to the bottom of the pair of wall panels 111. The plurality of connecting beams 112 are reinforcedly connected between the pair of wall panels 111 to enhance the support strength of the entire frame 11.

[0031] The moving assembly 12 includes a base 121, a guide rail 122, a rack 123, several moving wheels 124, a drive motor (not shown in the figure), and gears (not shown in the figure). The base 121 is arranged on the ground, and the guide rail 122 and rack 123 are arranged on the base 121 extending in the front-back direction. Several moving wheels 124 are symmetrically mounted in pairs on the bottom of a pair of wall panels 111, and roll in cooperation with the guide rail 122. The frame 11 is arranged above the base 121 and can move back and forth along the guide rail 122 via the several moving wheels 124. The drive motor is mounted on the base frame 113 of the frame 11, and a gear is sleeved on its drive shaft. The gear meshes with the rack 123. When the drive motor is working, the gear rotates, and the meshing of the gear and rack drives the frame 11 to move back and forth. In this embodiment, each of the movable wheels 124 is connected to the frame 11 by a lift 125. The lift 125 is used to drive the frame 11 to move up and down relative to the movable wheels 124, thereby lifting and lowering the frame 11 to meet the needs of different production lines.

[0032] In this embodiment, a sliding block 126 is provided on the housing of the front movable wheel 124 located at the bottom of the frame 11, which slides in cooperation with the guide rail 122. The sliding block 126 is not connected to the frame 11, but moves only with the movable wheel 124, thus not interfering with the lifting and lowering of the frame 11. The sliding cooperation between the sliding block 126 and the guide rail 122 guides the movement of the movable wheel 124, preventing the movable wheel from deviating from the guide rail 122.

[0033] like Figure 1 , 2 As shown in Figure 4, the front roller mechanism 20 includes a front roller 2 extending in the left-right direction, the middle roller mechanism 30 includes a middle roller 3 parallel to the front roller 2, and the rear roller mechanism 40 includes a rear roller 4 parallel to the front roller 2. Sliding bearing seats 51 are installed at both ends of the front roller 2 and the rear roller 4. The front roller 2 and the rear roller 4 are mounted on the top of the frame 11, allowing them to rotate around their own axis and move in the front-back direction via the sliding bearing seats 51. Fixed bearing seats 52 are installed at both ends of the middle roller 3. The middle roller 3 is mounted on the top of the frame 11, allowing it to rotate only around its own axis via the fixed bearing seats 52. The front roller 2 and the rear roller 4 can slide back and forth, thereby allowing adjustment of the gap between each roller and the middle roller 3, accommodating the production of products of different thicknesses, expanding the production range of the equipment, and facilitating sheet threading.

[0034] Each sliding bearing seat 51 is connected to the top of the wall panel 111 on the corresponding side by a sliding assembly 53. The sliding assembly 53 includes a slider 531 connected to the bottom of the sliding bearing seat 51 and a slide rail 532 installed on the top of the wall panel 111. The slide rail 532 extends in the front-back direction. The slider 531 slides in cooperation with the slide rail 532. Each sliding bearing seat 51 can move smoothly in the front-back direction through the sliding assembly 53, improving the flexibility of the movement of the front roller 2 and the rear roller 4.

[0035] The front roller 2 moves back and forth by a pair of first hydraulic cylinders 54. The cylinder bodies of the pair of first hydraulic cylinders 54 are fixedly installed on the top of a pair of wall plates 111 and arranged on the front side of the front roller 2. The telescopic rods of the pair of first hydraulic cylinders 54 are connected to the sliding bearing seats 51 at both ends of the front roller 2. The pair of first hydraulic cylinders 54 synchronously drive the pair of sliding bearing seats 51 at both ends of the front roller 2 to move back and forth, so that the front roller 2 can maintain a back-and-forth movement extending in the left and right direction, providing a smooth driving force for the front roller 2 to move back and forth.

[0036] The back-and-forth movement of the rear roller 4 is driven by a pair of second hydraulic cylinders 55. The pair of second hydraulic cylinders 55 are fixed on the top of the frame 11 and arranged on the rear side of the rear roller 4. The telescopic rods of the pair of second hydraulic cylinders 55 are respectively connected to the sliding bearing seats 51 at both ends of the rear roller 4, providing a smooth driving force for the back-and-forth movement of the rear roller 4.

[0037] A first cooling assembly 61 is installed on the front side of the front roller 2, and at least one second cooling assembly 62 is installed below the front roller 2. The first cooling assembly 61 and the second cooling assembly 62 can perform precise regional cooling of the front roller 2, effectively improving cooling efficiency and cooling effect. The first cooling assembly 61 includes a first cooling roller 611 parallel to the front roller 2 and a pair of drive cylinders 612. The pair of drive cylinders 612 are respectively connected to the two ends of the first cooling roller 611 and fixedly installed on the top of a pair of wall plates 111, for synchronously driving the first cooling roller 611 to move in the front-back direction, thereby adjusting the roller distance between the first cooling roller 611 and the front roller 2. Each second cooling assembly 62 includes a second cooling roller 621 parallel to the front roller 2 and a pair of first lifting cylinders 622. The pair of first lifting cylinders 622 are respectively drivenly connected to the two ends of the second cooling roller 621 and fixedly installed on the base frame 113, for synchronously driving the second cooling roller 621 to move horizontally in the up-down direction, thereby adjusting the roller distance between the second cooling roller 621 and the front roller 2.

[0038] A third cooling assembly 63 is installed below the middle roller 3. The third cooling assembly 63 includes a third cooling roller 631 parallel to the middle roller 3 and a pair of second lifting cylinders 632. The pair of second lifting cylinders 632 are respectively connected to the two ends of the third cooling roller 631 and fixedly installed on the base frame 113. They are used to synchronously drive the third cooling roller 631 to keep it horizontal and move it up and down in the vertical direction to adjust the distance between the third cooling roller 631 and the middle roller 3.

[0039] A fourth cooling assembly 64 is installed below the rear roller 4. The fourth cooling assembly 64 includes a fourth cooling roller 641 parallel to the rear roller 4 and a pair of third lifting cylinders 642. The pair of third lifting cylinders 642 are respectively connected to the two ends of the fourth cooling roller 641 and fixedly installed on the base frame 113. They are used to synchronously drive the fourth cooling roller 641 to keep it horizontal and move it up and down in the vertical direction, thereby adjusting the distance between the fourth cooling roller 641 and the rear roller 4.

[0040] The first cooling roller 611 and the second cooling roller 621 are distributed circumferentially around the front roller 2. All four cooling rollers (611, 621, 631, and 641) are connected to an external roller temperature control system, which circulates temperature-controlled cooling water to precisely control the surface temperature of each roller. The first and second cooling rollers 611 and 621 cool the front roller 2 in two zones, effectively improving cooling efficiency and meeting the cooling requirements of the front roller 2 even during high-speed operation. The third and fourth cooling rollers 631 cool the middle roller 3 and the rear roller 4, respectively, and the products passing over them. They can independently adjust their contact or proximity to the corresponding rollers according to the actual direction of the sheet and cooling requirements, effectively improving the shaping quality.

[0041] According to production needs, two cooling components can be installed below the front roller 2, the middle roller 3 and the rear roller 4 respectively, which are arranged opposite each other to enhance cooling efficiency.

[0042] The centerlines of the front roller 2, middle roller 3, and rear roller 4 are aligned in the front-to-back direction to ensure a neat layout of the equipment. The centerline of the first cooling roller 611 is located above the centerline of the front roller 2, shortening the longitudinal dimension of the equipment and ensuring its compact and stable structure. The diameter of the front roller 2 is smaller than that of the middle roller 3 and the rear roller 4, which facilitates the introduction and initial shaping of the sheet material. The diameters of the first cooling roller 611, second cooling roller 621, third cooling roller 631, and fourth cooling roller 641 are all smaller than that of the front roller 2 to maintain structural compactness and facilitate their auxiliary cooling positioning.

[0043] To drive the rotation of the front roller 2, middle roller 3, and rear roller 4, a drive motor is connected to one end of each roller. Specifically, the front roller 2 is connected to a first drive motor 71, the middle roller 3 is connected to a second drive motor 72, and the rear roller 4 is connected to a third drive motor 73. The three drive motors are centrally mounted on the same side of the frame 11 for easy wiring and management. A first quick-release connecting plate 74 connects the front roller 2 and the first drive motor 71, and a second quick-release connecting plate 75 connects the middle roller 3 and the second drive motor 72. Each quick-release connecting plate allows for quick and safe disassembly and installation of the rollers without moving the drive motors or misaligning the center, improving disassembly and assembly efficiency and facilitating roller maintenance and replacement.

[0044] like Figure 1 , 3 As shown in Figure 5, after the first quick-release connecting plate 74 is installed between the front roller 2 and the first drive motor 71, the load on the side where the first drive motor 71 is installed increases when the front roller 2 moves back and forth. This increases the friction between the slider 531 and the slide rail 532 below the sliding bearing seat 51, thereby increasing the driving load of the first oil cylinder 54. This results in a significant increase in energy consumption and increased wear of the sliding components, which is not conducive to the long-term use of the equipment.

[0045] To ensure smooth forward and backward movement of the front roller 2 and ease of maintenance, the first drive motor 71 and the first quick-release connecting plate 74 are slidably supported on one side of the frame 11 via a sliding support assembly 8. The sliding support assembly 8 includes a fixed bracket 81, a connecting bracket 82, an auxiliary sliding block 83, and an auxiliary guide rail 84. The fixed bracket 81 is fixedly installed on the outside of the frame 11 and extends outward. The connecting bracket 82 is supported below the connection point of the first drive motor 71 and the first quick-release connecting plate 74. The auxiliary guide rail 84 extends forward and backward and is fixed to the fixed bracket 81. The auxiliary sliding block 83 is fixed to the bottom of the connecting bracket 82, and the auxiliary sliding block 83 slides in cooperation with the auxiliary guide rail 84. The first drive motor 71 and the first quick-release connecting plate 74 can move synchronously with the front roller 2 in the forward and backward direction via the sliding support assembly 8, and can also slide apart when needed.

[0046] Continue to refer to Figure 1 , Figure 2 and Figure 4To facilitate precise adjustment and observation of the gaps between the front roller 2 and the middle roller 3, and between the middle roller 3 and the rear roller 4, gap adjustment devices 9 are installed between each sliding bearing seat 51 and the adjacent fixed bearing seat 52. The gap adjustment device 9 includes a dial indicator 91 and a handwheel 92 for operation. The dial indicator 91 displays the current size of the corresponding gap in real time for direct observation by the operator. When the operator turns the handwheel 92, the current gap size can be finely adjusted. To facilitate operation from the side of the frame 11, the handwheel 92 is angled towards the outside of the frame 11 to improve operational convenience.

[0047] In the shaping equipment of this application, the front roller 2 is driven to move back and forth by the first hydraulic cylinder 54 to quickly adjust the distance between the front roller 2 and the middle roller 3, and the rear roller 4 is driven to move back and forth by the second hydraulic cylinder 55 to quickly adjust the distance between the rear roller 4 and the middle roller 3. Then, the size of each gap is precisely adjusted by the gap adjustment device 9 to complete precise and independent gap adjustment. The front roller 2 is circumferentially equipped with a first cooling component and at least one second cooling component. Efficient cooling is achieved through at least two cooling components to meet the cooling requirements of high-speed production. According to the actual direction of the sheet and the cooling requirements, the cooling components under the front roller 2, middle roller 3 and rear roller 4 are adjusted to their respective distances from each roller to achieve precise, zoned, staged and asymmetrical cooling, effectively controlling sheet shrinkage and deformation, and improving shaping quality.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made without departing from the spirit and scope of this application. The scope of protection claimed by this application is defined by the appended claims, specification, and their equivalents.

Claims

1. A setting device for the shaping of a polyolefin sheet material, characterized in that, The application relates to a supporting mechanism, a front roller mechanism, a middle roller mechanism and a rear roller mechanism. The supporting mechanism comprises a frame and a moving assembly installed at the bottom of the frame, and the frame can move back and forth along the front-rear direction through the moving assembly. The front roller mechanism comprises a front roller extending along the left-right direction, a first cooling assembly installed at the front side of the front roller and at least one second cooling assembly installed below the front roller, the front roller is rotatably installed at the top of the frame along the front-rear direction, the first cooling assembly comprises a first cooling roller capable of moving along the front-rear direction, and the second cooling assembly comprises a second cooling roller capable of moving along the up-down direction. The middle roller mechanism is arranged at the rear side of the front roller mechanism, and the middle roller mechanism comprises a middle roller parallel to the front roller and at least one third cooling assembly installed below the middle roller, the middle roller is rotatably installed at the top of the frame, and the third cooling assembly comprises a third cooling roller capable of moving along the up-down direction. The rear roller mechanism is arranged at the rear side of the middle roller mechanism, and the rear roller mechanism comprises a rear roller parallel to the front roller and at least one fourth cooling assembly installed below the rear roller, the rear roller is rotatably installed at the top of the frame along the front-rear direction, and the fourth cooling assembly comprises a fourth cooling roller capable of moving along the up-down direction. The axis lines of the front roller, the middle roller and the rear roller are aligned in the front-rear direction, and the axis line of the first cooling roller is located above the axis line of the front roller. The two end portions of the front roller and the two end portions of the rear roller are respectively matched with sliding bearing seats, and the two end portions of the middle roller are respectively matched with fixed bearing seats; each sliding bearing seat is connected with the top of the frame through a sliding assembly, the sliding assembly comprises a sliding block installed at the bottom of the sliding bearing seat and a sliding rail installed at the top of the frame, the sliding rail extends along the front-rear direction, and the sliding block is slidably matched with the sliding rail; and the fixed bearing seat is fixedly installed at the top of the frame.

2. The sizing apparatus of claim 1, wherein, Each sliding bearing seat is provided with a pressing oil cylinder, each pressing oil cylinder is used for driving the corresponding sliding bearing seat to move along the front-rear direction, a pair of pressing oil cylinders connected with the sliding bearing seats of the two end portions of the front roller are arranged at the front side of the front roller, a pair of pressing oil cylinders connected with the sliding bearing seats of the two end portions of the rear roller are arranged at the rear side of the rear roller, and each pressing oil cylinder is fixedly installed at the top of the frame.

3. The sizing apparatus of claim 2, wherein, One end portion of the front roller is drivingly connected with a first driving motor so as to rotate around the axis line under the driving of the first driving motor, one end portion of the middle roller is drivingly connected with a second driving motor so as to rotate around the axis line under the driving of the second driving motor, and one end portion of the rear roller is drivingly connected with a third driving motor so as to rotate around the axis line under the driving of the third driving motor; and the first driving motor, the second driving motor and the third driving motor are arranged at the same side of the frame.

4. The sizing apparatus of claim 1, wherein ​ 5. The sizing apparatus of claim 4, wherein, The front roller is connected with the first drive motor through a first quick-release connecting disc, and the middle roller is connected with the second drive motor through a second quick-release connecting disc.

6. The sizing apparatus of claim 5, wherein, The first drive motor and the first quick-release connecting disc are slidably supported on one side of the frame through a sliding support assembly, which comprises a fixed support, a connecting support, an auxiliary sliding block and an auxiliary guide rail. The fixed support is fixedly installed on the outside of the frame and extends outward. The connecting support is supported below the connection between the first drive motor and the first quick-release connecting disc. The auxiliary guide rail extends in the front-rear direction and is fixed on the fixed support. The auxiliary sliding block is fixed on the bottom of the connecting support and is in sliding cooperation with the auxiliary guide rail.

7. The sizing apparatus of claim 1, wherein The first cooling roller is movably installed on the front side of the front roller through a pair of drive air cylinders. The drive air cylinders are arranged opposite to each other and are fixed on the top of the frame.

8. The sizing apparatus of claim 1, wherein, The second cooling roller, the third cooling roller and the fourth cooling roller are respectively provided with a lifting air cylinder to move in the up-down direction under the drive of the corresponding lifting air cylinder.

9. The sizing apparatus of claim 1, wherein, A gap adjusting device is installed between each sliding bearing seat and the fixed bearing seat. The gap adjusting device comprises a dial indicator and a hand wheel for operation. The hand wheel is obliquely arranged towards the outside of the frame.

10. The sizing apparatus of claim 1, wherein, The diameter of the front roller is smaller than that of the middle roller and the rear roller. The diameters of the first cooling roller, the second cooling roller, the third cooling roller and the fourth cooling roller are all smaller than that of the front roller.

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