A hydraulic roller die for a ring die pelletizing machine with adjustable roller die gap

Abstract

The invention discloses a hydraulic roller die of a ring die pelletizer with adjustable roller die gap, and relates to the technical field of adjusting the gap between the roller and the ring film of the ring die pelletizer. A double roller assembly is arranged inside the ring die, and each roller is locked and mounted on an eccentric spline shaft, and the two ends of the eccentric spline shaft are respectively mounted on a front fixing plate and a rear fixing plate of the roller, and a rear fixing plate hollow shaft is arranged on the rear fixing plate of the roller; the eccentric spline shaft cooperates with a spline arm through a spline, and a hinge middle connecting rod is installed at the end of the spline arm, and the hinge middle connecting rod is connected to the end of a hinge oil cylinder connecting rod, and the hinge oil cylinder connecting rod is matched with a piston of a hydraulic oil cylinder through a double-headed nut, and the hydraulic oil cylinder is connected to an oil return pipe and an oil inlet pipe, and the oil return pipe and the oil inlet pipe are connected to an external hydraulic system through a hollow shaft of a rear fixing plate. The invention is easy to operate, reliable in action, can realize the adjustment of the roller die gap without stopping the machine, ensures the quality of the pelletized product, improves the production efficiency, has good stability, and has broad application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of adjusting the gap between a pressure roller and a ring film of a ring die pelletizer, and in particular to a hydraulic roller die of a ring die pelletizer with an adjustable roller-die gap. Background Art

[0002] The feed industry is an emerging industry that is cross-industry, cross-department and cross-disciplinary, which has gradually developed with the development of animal nutrition and feed science, and after the industrialization level has been improved and reached a certain stage. With the rapid development of the feed industry, the demand for feed machinery is increasing, and the requirements are getting higher and higher. The research and development of high-quality and high-efficiency feed machinery products has become an urgent need to support the development of the feed industry.

[0003] Ring die pellet mill is one of the four main machines of feed machinery. It has a series of advantages such as high forming rate and high processing efficiency, and has been widely promoted and applied in my country. However, the existing ring die pellet mill has obvious defects, such as unreasonable structure, low production efficiency, high energy consumption, etc. Among them, due to the working characteristics of the ring die pellet mill, the inner wall of the ring die will wear and the gap between the grinding roller will increase in a short time during the working process. The problems of low pelleting quality and production efficiency of the ring die are particularly prominent. In the actual production process, many problems such as serious ring die wear and poor pelleting quality are prone to occur. The traditional solution requires stopping the machine, opening the ring die and manually adjusting the gap between the grinding rollers, which greatly affects the working efficiency of the ring die pellet mill.

[0004] In order to solve the above problems, it is particularly necessary to design a new type of hydraulic roller die for a ring die pelletizer which can adjust the gap between the grinding rollers through a hydraulic device. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a hydraulic roller die for a ring die pelletizer with adjustable roller die gap, which has a simple structure, reasonable design, and easy operation, and can adjust the roller die gap without stopping the machine, thereby ensuring the quality of pelletized products and improving the production efficiency of the ring die pelletizer. The invention is practical, reliable, and easy to promote and use.

[0006] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical scheme: a hydraulic roller die of a ring die pelletizer with adjustable roller die gap, comprising a ring die, a pressure roller, an eccentric spline shaft, a spline arm, a front fixing plate of the pressure roller, a rear fixing plate of the pressure roller, a hollow shaft of the rear fixing plate and a hydraulic cylinder, a double pressure roller assembly is arranged inside the ring die, a bearing, a bearing sleeve and a retaining ring are installed inside each pressure roller, sealing retaining rings are installed at both ends of the pressure roller, the pressure roller is installed on the eccentric spline shaft through a shaft end locking nut and an internal bearing locking, one end of the eccentric spline shaft is installed in the front light hole of the front fixing plate of the pressure roller, and the eccentric spline shaft is installed in the front light hole of the front fixing plate of the pressure roller. The other end is installed in the rear light hole of the rear fixing plate of the pressure roller. A rear fixing plate hollow shaft is provided on the rear fixing plate of the pressure roller. The eccentric spline shaft cooperates with the spline arm through the spline at the external protruding end. A hinge intermediate connecting rod is installed at the end of the spline arm through a gasket and a pin. The hinge intermediate connecting rod is connected to the end of the hinge cylinder connecting rod. The hinge cylinder connecting rod is connected to the piston of the hydraulic cylinder through a stud nut. The hydraulic cylinder is fixed to the front fixing plate of the pressure roller by fixing bolts. The hydraulic cylinder is connected to the return oil pipe and the oil inlet pipe. The return oil pipe and the oil inlet pipe are led to the outside through the hollow shaft of the rear fixing plate.

[0007] Preferably, the eccentric spline shaft and the spline arm are fixed by means of an internal washer, an external end cover and screws.

[0008] Preferably, the front fixing plate of the pressure roller and the rear fixing plate of the pressure roller are fixedly connected by means of hexagon socket bolts, nuts and a central sleeve.

[0009] Preferably, hydraulic pipe through holes are respectively left on both sides of the hydraulic cylinder on the front fixed plate of the pressure roller, and the return oil pipe and the oil inlet pipe are successively inserted into the hollow shaft of the rear fixed plate through the hydraulic pipe through holes and the gaps between the pressure rollers on both sides. The hollow shaft of the rear fixed plate supporting the pressure roller adopts a hollow shaft design, so that the return oil pipe and the oil inlet pipe can be led out from the inside of the ring die and connected to the external hydraulic control system, so as to realize the control of the roller die gap from the outside.

[0010] Preferably, the hydraulic control system includes a hydraulic oil pump, an oil supply check valve, an oil pump outlet and an overflow valve, a three-position four-way valve, an accumulator, a hydraulic oil tank, a safety valve, an oil return check valve and an oil return filter. The inlet of the hydraulic oil pump is connected to the hydraulic oil tank, and the outlet of the hydraulic oil pump is connected to the hydraulic cylinder via the oil supply check valve and the three-position four-way valve. The outlet of the hydraulic oil pump is also connected to the hydraulic oil tank via the oil pump outlet and the overflow valve. An accumulator is arranged on the oil inlet pipeline connected to the hydraulic cylinder by the three-position four-way valve. A safety valve is arranged on the oil return pipeline connected to the hydraulic cylinder by the three-position four-way valve, which is connected to the hydraulic oil tank via the oil return check valve and the oil return filter. The oil return filter is installed at the end of the oil return pipe. The hydraulic control system ensures the sealing of the hydraulic oil by stopping the three-position four-way valve in the middle position, thereby ensuring the stable position of the pressure roller during operation. The function of the safety valve is that when a foreign object enters the gap between the die and the roller, the hydraulic oil pressure increases instantly, and the safety valve is actuated to release the pressure, thereby protecting the ring die and the pressure roller.

[0011] The beneficial effects of the invention are as follows: the device is easy to install, easy to operate, quick to respond, reliable in action, can adjust the roller die gap without stopping the machine, ensure the quality of the granulated product, improve the production efficiency of the ring die granulator, has good stability, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments;

[0013] Figure 1 This is a schematic diagram of the overall installation of the ring die and the pressure roller of the present invention;

[0014] Figure 2 It is a schematic diagram of the installation of the pressure roller and the front and rear fixing plates of the present invention;

[0015] Figure 3 It is a schematic diagram of the installation of the oil return pipe and the oil inlet pipe of the present invention;

[0016] Figure 4 is an internal cross-sectional view of the pressure roller of the present invention;

[0017] Figure 5 It is a structural schematic diagram of the eccentric spline shaft of the present invention;

[0018] Figure 6 for Figure 5 Left view of;

[0019] Figure 7 It is a control principle diagram of the hydraulic control system of the present invention. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] Reference Figure 1-7 The present specific implementation adopts the following technical scheme: a hydraulic roller die of a ring die pelletizer with adjustable roller gap, comprising a ring die 1, a pressure roller 2, an eccentric spline shaft 3, a spline arm 4, a front fixing plate 5 of the pressure roller, a rear fixing plate 6 of the pressure roller, a hollow shaft 7 of the rear fixing plate and a hydraulic cylinder 8. A double pressure roller assembly is arranged inside the ring die 1, a bearing 15, a bearing sleeve 16 and a retaining ring 17 are installed inside each pressure roller 2, sealing rings 18 are installed at both ends of the pressure roller 2, and the pressure roller 2 is locked by a shaft end locking nut 19 and an internal bearing 15. It is installed on the eccentric spline shaft 3, and relies on the friction of the material to make the pressure roller 2 rotate; the spline shaft can be used to fine-tune the initial angle of the pressure roller, one end of the eccentric spline shaft 3 is installed in the front light hole 20 of the front fixing plate 5 of the pressure roller, and the other end of the eccentric spline shaft 3 is installed in the rear light hole 21 of the rear fixing plate 6 of the pressure roller, and the rear fixing plate 6 of the pressure roller is provided with a rear fixing plate hollow shaft 7, and the front fixing plate 5 of the pressure roller and the rear fixing plate of the pressure roller 6 are fixedly connected by a hexagon socket bolt column 27, a nut and a center sleeve 28.

[0022] The external protruding end of the eccentric spline shaft 3 is provided with a spline that is installed in coordination with the spline arm 4. The spline connection is adopted to increase the connection strength and enable the initial eccentric shaft angle adjustment. The eccentric spline shaft 3 and the spline arm 4 are locked and fixed by an internal gasket 24, an external end cover 25 and a screw 26. The spline arm 4 and the eccentric spline shaft 3 are simply matched and the movement is reliable, so that the double pressure rollers can rotate in the same direction and at the same angle. The end of the spline arm 4 is provided with a hinge intermediate connecting rod 9 through a gasket 22 and a pin 23. The hinge intermediate connecting rod 9 is connected to the end of the hinge oil cylinder connecting rod 10. The hinge oil cylinder connecting rod 10 is connected to the piston of the hydraulic cylinder 8 through a stud nut 11. The hydraulic cylinder 8 is fixed to the front fixing plate 5 of the pressure roller through a fixing bolt 12. The hydraulic cylinder 8 is connected to the return oil pipe 13 and the oil inlet pipe 14. The return oil pipe 13 and the oil inlet pipe 14 are led to the outside through the hollow shaft 7 of the rear fixing plate.

[0023] It is worth noting that hydraulic pipe through holes 29 are respectively left on both sides of the hydraulic cylinder 8 on the front fixing plate 5 of the pressure roller. The return oil pipe 13 and the oil inlet pipe 14 are successively passed through the hydraulic pipe through holes 29 and the gaps between the pressure rollers on both sides into the hollow shaft 7 of the rear fixing plate, and are led out to be connected to the external hydraulic control system.

[0024] In addition, the hydraulic control system includes a hydraulic oil pump 30, an oil supply check valve 31, an oil pump outlet and a relief valve 32, a three-position four-way valve 33, an accumulator 34, a hydraulic oil tank 35, a safety valve 36, an oil return check valve 37 and an oil return filter 38. The inlet of the hydraulic oil pump 30 is connected to the hydraulic oil tank 35, and the outlet of the hydraulic oil pump 30 is connected to the hydraulic cylinder 8 via the oil supply check valve 31 and the three-position four-way valve 33. The outlet of the hydraulic oil pump 30 is also connected to the hydraulic oil tank 35 via the oil pump outlet and the relief valve 32. The oil pump outlet and the relief valve 32 can prevent the system oil pressure from being too high when not in operation; the three-position four-way valve 33 is connected to the hydraulic cylinder 8 An accumulator 34 is arranged on the oil inlet pipeline connected thereto. The system is equipped with an accumulator 34 to ensure that the system can maintain a certain oil pressure when there is an oil leakage. A safety valve 36 is arranged on the oil return pipeline connecting the three-position four-way valve 33 and the hydraulic cylinder 8. The safety valve 36 is connected to the hydraulic oil tank 35 via a return oil check valve 37 and a return oil filter 38. The function of the safety valve 36 is that when a foreign object enters the gap between the die rollers, the hydraulic oil pressure increases instantly, and the safety valve 36 is actuated to release the pressure, thereby protecting the ring die 1 and the pressure roller 2. The return oil filter 38 is installed at the end of the return oil pipe 13. The return oil filter 38 is used to filter out impurities in the hydraulic oil system and needs to be cleaned regularly during use.

[0025] This specific implementation can achieve adjustment without stopping the machine. The hydraulic cylinder 8 drives the double-hinged four-bar mechanism composed of the spline arm 4, the hinged intermediate connecting rod 9, and the hinged cylinder connecting rod 10, and the telescopic movement of the cylinder is converted into the rotation of the eccentric spline shaft 3, so that the eccentric spline shaft can rotate to adjust the eccentric distance, and then the roller mold gap can be controlled by the hydraulic device to achieve the adjustment of the grinding roller gap, and the protection of the grinding roller gap from foreign objects and the fixing of the eccentric spline shaft angle can be achieved through the hydraulic safety valve 36 and the three-position four-way valve 33. Its working principle is: start the hydraulic oil pump 30, push the three-position four-way valve 33 to switch, and the piston of the hydraulic cylinder 8 extends. At this time, the eccentric spline shaft 3 is driven by the hinge mechanism to realize the rotational movement of the eccentric spline shaft 3. Since the eccentric spline shaft 3 has a certain eccentric structure, when the eccentric spline shaft 3 rotates relative to the fixed plate, the gap between the roller and the die is adjusted by the eccentric shaft, so that the gap between the pressure roller 2 and the ring die 1 is adjusted; similarly, when the ring film granulator replaces the new ring die and needs to shrink the ring die 2, the adjustment is achieved by pulling the three-position four-way valve 33.

[0026] In the hydraulic control system installed outside the device, the hydraulic oil in the hydraulic oil tank 35 enters the cavity of the hydraulic cylinder 8 through the hydraulic oil pump 30, the oil supply check valve 31, and the three-position four-way valve 33. The lifting and lowering of the piston of the hydraulic cylinder 8 is controlled by the three-position four-way valve 33, and the hydraulic oil sealing is ensured by the stop position of the three-position four-way valve 33, thereby ensuring the stable position of the pressure roller 2 during operation; the system reasonably arranges the safety valve 36 on the hydraulic pipeline. When foreign objects such as stones enter the gap between the ring die 1 and the pressure roller 2, the hydraulic oil pressure increases. Since the pressure between the ring die 1 and the pressure roller 2 increases instantaneously and reaches the rated pressure release value of the safety valve, the safety valve 36 is activated at this time, the hydraulic oil is depressurized, and flows back to the hydraulic oil tank 35, the pressure roller 2 shrinks, and the gap between the roller and the die increases, thereby avoiding damage to the roller die and realizing the protection of the ring die 1 and the pressure roller 2.

[0027] Compared with the solid shaft structure of the rear pressure roller fixing plate core shaft of the traditional ring film granulator, in this specific embodiment, in order to realize hydraulic control, the hollow shaft 7 of the rear fixing plate supporting the pressure roller adopts a hollow shaft structure. The purpose of using the hollow shaft of the rear fixing plate is that: the ring die is closed and has a certain rotation speed, and the hydraulic pipeline layout needs to pass through the hollow shaft of the rear fixing plate and lead out to the outside. The setting of the hollow shaft of the rear fixing plate 7 facilitates the installation, layout and lead-out of the hydraulic oil pipe, so that the return oil pipe 13 and the oil inlet pipe 14 can be led out from the inside of the ring die 1 and connected to the external hydraulic control system, so as to realize the control of the roller die gap from the outside.

[0028] The technical advantages of this specific implementation are:

[0029] (1) Simple operation, avoiding the time and manpower consumed by stopping and dismantling the machine for adjusting the gap between the grinding rollers, reducing production costs and improving work efficiency.

[0030] (2) The roller gap can be adjusted during operation without stopping the machine, and the optimal roller gap can be achieved, thereby ensuring the best processing quality.

[0031] (3) The matching hydraulic drive device has low cost and reliable operation. The ring die and pressure roller can be protected by hydraulic components. The hydraulic control saves time and effort, responds quickly and operates reliably.

[0032] (4) The double hinge mechanism has a simple structure and stable operation. It can adjust the gap of the two pressure rollers at the same time, making the adjustment synchronous and avoiding the situation where the gap adjustment on both sides is inconsistent.

[0033] (5) The eccentric shaft adopts splines, which can more accurately and finely adjust the gap between the pressure roller and the ring die, making it easier to install.

[0034] In summary, this specific implementation method adopts hydraulic, connecting rod, spline and other mechanical structures to complete the adjustment of the gap between the ring die and the pressure roller, thereby realizing the adjustment of the roller die gap and the protection of the grinding roller without stopping or disassembling the machine. The adjustment is simpler, more convenient and reliable, and various problems in traditional production are solved. While improving the granulation level of the ring film granulator, the processing efficiency of the ring film granulator is improved, the product quality is improved, the product processing quality is improved, the operation is simple and light, the manufacturing cost is low, the safety factor is high, the market competitiveness of the enterprise is enhanced, and it has broad market application prospects.

[0035] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydraulic roller die for a ring die pelletizing machine with adjustable roller die gap, characterized in that: The invention comprises a ring die (1), a pressure roller (2), an eccentric spline shaft (3), a spline arm (4), a front fixing plate (5) of the pressure roller, a rear fixing plate (6) of the pressure roller, a hollow shaft (7) of the rear fixing plate and a hydraulic cylinder (8). A double pressure roller assembly is arranged inside the ring die (1). A bearing (15), a bearing sleeve (16) and a retaining ring (17) are installed inside each pressure roller (2). Sealing rings (18) are installed at both ends of the pressure roller (2). The pressure roller (2) is locked and installed on the eccentric spline shaft (3) through a shaft end locking nut (19) and an internal bearing (15). One end of the eccentric spline shaft (3) is installed in a front light hole (20) of the front fixing plate (5) of the pressure roller, and the other end of the eccentric spline shaft (3) is installed in a rear light hole (21) of the rear fixing plate (6) of the pressure roller. The rear fixing plate (6) of the pressure roller is provided with a rear fixing plate hollow shaft (7), the eccentric spline shaft (3) cooperates with the spline arm (4) through the spline at the externally protruding end, the end of the spline arm (4) is installed with a hinge intermediate connecting rod (9) through a gasket (22) and a pin (23), the hinge intermediate connecting rod (9) is connected to the end of the hinge oil cylinder connecting rod (10), the hinge oil cylinder connecting rod (10) is connected to the piston of the hydraulic cylinder (8) through a double-headed nut (11), the hydraulic cylinder (8) is fixed to the front fixing plate (5) of the pressure roller through a fixing bolt (12), the hydraulic cylinder (8) is connected with the return oil pipe (13) and the oil inlet pipe (14), and the return oil pipe (13) and the oil inlet pipe (14) are led to the outside through the rear fixing plate hollow shaft (7).

2. The hydraulic roller die of a ring die pelletizer with adjustable roller die gap according to claim 1, characterized in that: The eccentric spline shaft (3) and the spline arm (4) are locked and fixed by means of an internal washer (24), an external end cover (25) and a screw (26).

3. The hydraulic roller die of a ring die pelletizer with adjustable roller die gap according to claim 1, characterized in that: The front fixing plate (5) of the pressure roller and the rear fixing plate (6) of the pressure roller are fixedly connected via hexagon socket bolts (27), nuts and a central sleeve (28).

4. The hydraulic roller die of a ring die pelletizer with adjustable roller die gap according to claim 1, characterized in that: The front fixing plate (5) of the pressure roller is provided with hydraulic pipe through holes (29) on both sides of the hydraulic oil cylinder (8), and the return oil pipe (13) and the oil inlet pipe (14) are passed through the hydraulic pipe through holes (29) and the gaps between the pressure rollers on both sides in sequence, and then penetrate into the hollow shaft (7) of the rear fixing plate, and are led out to be connected to an external hydraulic control system.

5. The hydraulic roller die of a ring die pelletizing machine with adjustable roller die gap according to claim 4, characterized in that: The hydraulic control system comprises a hydraulic oil pump (30), an oil supply check valve (31), an oil pump outlet and a relief valve (32), a three-position four-way valve (33), an accumulator (34), a hydraulic oil tank (35), a safety valve (36), an oil return check valve (37) and an oil return filter (38). The inlet of the hydraulic oil pump (30) is connected to the hydraulic oil tank (35), and the outlet of the hydraulic oil pump (30) is connected to the hydraulic cylinder (8) via the oil supply check valve (31) and the three-position four-way valve (33). The outlet of the hydraulic oil pump (30) is also connected to the hydraulic cylinder (8) via the three-position four-way valve (33). The oil pump outlet and the overflow valve (32) are connected to the hydraulic oil tank (35). The oil pump outlet and the overflow valve (32) prevent the system oil pressure from being too high when not in operation. An accumulator (34) is provided on the oil inlet pipeline connecting the three-position four-way valve (33) and the hydraulic cylinder (8). A safety valve (36) is provided on the oil return pipeline connecting the three-position four-way valve (33) and the hydraulic cylinder (8). The oil return pipeline is connected to the hydraulic oil tank (35) via an oil return check valve (37) and an oil return filter (38). The oil return filter (38) is installed at the end of the oil return pipe (13).

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