Auxiliary pushing mechanism and roller dryer

Abstract

The invention discloses an auxiliary material pushing mechanism and a roller dryer, and relates to the technical field of material pushing, the auxiliary material pushing mechanism comprises material pushing plates and a push rod, the two ends of the push rod are movably connected to one ends of the material pushing plates respectively, the other ends of the material pushing plates are hinged to the inner layer of the roller dryer, and the end face projections of the two material pushing plates are located on the same diameter of the roller dryer. The two material pushing plates are arranged at an axial interval, and the material pushing plate located at the top of the roller dryer can swing by means of self weight and push the push rod and the material pushing plate at the bottom to move in the discharging direction of the roller dryer. The roller dryer can effectively solve the problems that materials move slowly in the roller dryer and the filling rate of the materials in the roller is low, is particularly suitable for light materials with low density and small viscosity, can improve the filling rate and the moving efficiency of the materials in the drying roller, enables the materials to be distributed more uniformly in the roller and to be in full contact with heat exchange elements, and improves the drying efficiency of the materials. And the materials can be smoothly pushed out, so that the phenomenon of material blockage in the barrel body is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of material pushing, in particular to an auxiliary material pushing mechanism and a drum drying machine. Background Art

[0002] Steam dryer refers to a structure that uses a circular membrane drum as the drying body and moves in a rotating manner. The membrane drum dryer uses steam above 0.3MPa as heat energy and heat exchange elements as carriers to indirectly heat and dry the wet materials containing water. There are many heat exchange elements in the dryer, which often affect the moving speed of the materials. The drum dryer is set with an inclination angle, and its feed end is the end that receives the external wet materials and is at a high position. The general inclination angle is 2°-3°.

[0003] Steam drum dryer has been widely used now. It has the advantages of high drying efficiency, energy saving, strong applicability to materials, and relatively low investment. After the material enters the dryer, due to the inclination of the dryer cylinder, the rotation of the dryer can move the material forward, but the moving speed is greatly affected by the material's own stacking angle. Generally, the filling rate in the drum is between 0.12-0.2. This filling rate makes the effective heat exchange element of the drum unable to fully play its role. When the material feeding speed increases, the material at the feeding end of the cylinder will accumulate quickly. When the material accumulates to the height of the innermost circle of heat exchange tubes, the flow of the material inside the cylinder will reach the maximum speed of gravity. At this time, the material feeding speed is still greater than the material outlet speed. The feeding end of the cylinder will be blocked, and it is more likely that the limited space in the cylinder will be squeezed. The material is compacted at the heat exchange tube, and it is often necessary to stop the machine for manual dredging and cleaning.

[0004] At present, the flow state of materials in the membrane drum dryer is completely realized by gravity. The moving speed and filling rate of materials in the drum can only be completed by their own characteristics, which causes the material filling rate of the membrane drum dryer to affect the heat transfer efficiency of the dryer, and the moving speed of the materials affects the mechanical efficiency of the dryer. There is no way to effectively solve the flow speed and filling rate of materials in the drum in the existing membrane drum dryer. The heat exchange efficiency in the dryer can only be sacrificed and the operating efficiency requirements of the dryer can be reduced to meet the performance of the dryer. Therefore, a solution to improve the moving efficiency of materials in the drying drum is urgently needed. Summary of the invention

[0005] The object of the present invention is to provide an auxiliary material pushing mechanism and a drum dryer to solve the problems existing in the above-mentioned prior art and to improve the material moving efficiency and working efficiency in the drum dryer.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides an auxiliary pushing mechanism, including a pushing plate and a pushing rod, wherein both ends of the pushing rod are respectively movably connected to one end of the pushing plate, and the other end of the pushing plate is hinged to the inner layer of the drum dryer. The end surface projections of the two pushing plates are located on the same diameter of the drum dryer, and the two pushing plates are provided with an axial spacing. The pushing plate located at the top of the drum dryer can swing by its own weight and push the pushing rod and the pushing plate at the bottom to move along the discharge direction of the drum dryer.

[0008] Preferably, the push plate is hinged to the heat exchange tube in the drum dryer through a hinge assembly, and the hinge assembly includes a connecting plate, a latch and a hinge seat, one end of the hinge seat is U-shaped, and a rocker arm is welded to the other end, the rocker arm is welded to one end of the push plate, and the U-shaped end of the hinge seat is plugged into the connecting plate and hinged through the latch, and the connecting plate is welded to the inner layer of the drum dryer.

[0009] Preferably, the push plate is movably connected to the push rod via a ball pair assembly, and the ball pair assembly includes a ball pair seat and a ball head that match each other, and the push rod is welded to the ball head or connected to the ball head via bolts.

[0010] Preferably, the ball seat is hinged to a connecting seat via a latch, the connecting seat is welded to the push plate, and the angle between the connecting seat and the upper plane of the push plate is 45°-60°.

[0011] Preferably, the push rod is Z-shaped and the angles between adjacent folding rods are 120°-140°.

[0012] Preferably, the axial spacing between the two pusher plates is 0.5 times to 1 times the diameter of the center distance of the heat exchange tube of the drum dryer.

[0013] Preferably, the push plate is a spiral plate, the spiral angle of the spiral plate is 30°-60°, and the rotation direction of the push plate is consistent with the rotation direction of the drum dryer.

[0014] Preferably, the push plate and the push rod are made of hard metal or hard non-metal material.

[0015] The present invention also relates to a drum dryer. Based on the above auxiliary pushing mechanism, the inner layer of the drum dryer is provided with a plurality of groups of the auxiliary pushing mechanisms, and the drum dryer is arranged at an inclination angle of 2°-3°.

[0016] Preferably, both ends of the auxiliary pushing mechanism are evenly distributed along the circumferential direction of the drum dryer, and the distance between adjacent auxiliary pushing mechanisms is at least 0.5 times the diameter of the drum dryer.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The present invention can effectively solve the problems of slow material movement speed and low material filling rate in the drum dryer, and is particularly suitable for lightweight materials with low density and low viscosity. It can improve the filling rate and movement efficiency of the material in the drum, make the material more evenly distributed in the drum, fully contact with the heat exchange element, and enable the material to be pushed out smoothly, thus avoiding material blockage in the drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a drum dryer with an auxiliary material pushing mechanism in an embodiment of the present invention;

[0021] Figure 2 The schematic diagram of the principle structure of the auxiliary pushing mechanism in the embodiment of the present invention is as follows Figure 1 ;

[0022] Figure 3 The schematic diagram of the principle structure of the auxiliary material pushing mechanism in the embodiment of the present invention is as follows Figure 2 ;

[0023] Figure 4 It is a partial structural schematic diagram of the auxiliary material pushing mechanism in an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the structure of a hinge assembly in an embodiment of the present invention;

[0025] Figure 6 It is a structural schematic diagram of a ball pair assembly in an embodiment of the present invention;

[0026] Figure 7 Schematic diagram of the structure of the push rod in the embodiment of the present invention;

[0027] Figure 8 It is a structural schematic diagram of a push plate in an embodiment of the present invention;

[0028] Fig. 9 A schematic diagram of force analysis of a push plate in an embodiment of the present invention;

[0029] In the figure: 1-push plate, 2-push rod, 3-connecting plate, 4-latch pin, 5-hinge seat, 6-rocker, 7-ball seat, 8-ball head, 9-connecting seat, 10-heat exchange tube, 11-drum dryer. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The purpose of the present invention is to provide an auxiliary material pushing mechanism and a drum dryer to solve the problems existing in the prior art and to improve the material moving efficiency and working efficiency in the drum dryer.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Embodiment 1

[0034] like Figures 1 to 9 As shown, an auxiliary pushing mechanism is provided in this embodiment, including a pushing plate and a pushing rod, both ends of the pushing rod are respectively movably connected to one end of a pushing plate, and the other end of the pushing plate is hinged to the inner layer of the drum dryer. The end surface projections of the two pushing plates are located on the same diameter of the drum dryer, and the two pushing plates are provided with an axial spacing. The pushing plate located at the top of the drum dryer can swing by its own weight, and push the push rod and the pushing plate at the bottom to move along the discharge direction of the drum dryer.

[0035] As an optional solution, in this embodiment, the push plate and the heat exchange tube in the drum dryer are hinged by a hinge assembly. The hinge assembly includes a connecting plate, a latch and a hinge seat. One end of the hinge seat is U-shaped and a swing arm is welded to the other end. The swing arm is welded to one end of the push plate, preferably welded to 1 / 4 of the length of the push plate to ensure the connection strength. The U-shaped end of the hinge seat is plugged into the connecting plate and hinged by the latch. The connecting plate is welded to the inner layer of the drum dryer. Usually the dryer is arranged at an angle, with the front lower and the back higher. The welding angle of the connecting plate at the rear end and the heat exchange tube is 60°-75°. The push plate is installed opposite to the front end. The welding angle of the connecting plate at the front end and the heat exchange tube is 15°~30°. Fig. 9As shown in the figure, when the front end is at the high position, after the cylinder continues to rotate 120°, the gravity component force is calculated to be converted into the anti-torsion bar thrust T = G*sin(180°-120°), and the thrust T acts on the front push plate component T1 = T*COS(15°~30°). The component force value is determined according to the welding angle of 15°~30°, and the front plate force component is calculated to be the gravity component force of the front and rear blades T1 = G*sin(180-1 20)*Cos(15°~30°), this force component is the force component of the horizontal state of the cylinder, the cylinder inclination angle is not less than 2°, the actual force component Tn=T1*Cos2°, that is, Tn=G*sin(180°-120°)*Cos(15°~30°)*Cos2°; calculate the reaction force of the front push plate N=G*COS(180°-120°)*Cos2°, the calculated result T1>N. Similarly, continue to return the blade to the front end, and then rotate to 150°-200°, the rear blade pushes the front end to push the material forward. Every two sets of push plate hinges and a push rod form an auxiliary push mechanism, and the upper and lower push plates form a group. When the cylinder of the drum dryer 11 rotates, mainly due to the gravity of the push plate, the push plate is transformed by the push rod to swing axially, thereby driving the push plate under the cylinder to produce periodic swings along the axial direction. When the rear end push plate is in a high position, the gravity component pushes the front end push plate forward; when the front end push plate is in a high position, a backward thrust is generated. When the cylinder rotates to 120°, the gravity component causes the front and rear plates to return to their original positions, and the material is pushed forward. The materials are pushed forward, and the materials are pushed forward by alternating operation.

[0036] As an optional solution, in this embodiment, the push plate and the push rod are movably connected through a ball pair assembly, and the ball pair assembly includes a ball pair seat and a ball head that match each other, and the push rod is welded or bolted on the ball head. In this embodiment, the ball pair connection is used to ensure that the push plate and the push rod can move in multiple angles and directions, avoid getting stuck, and better transmit force.

[0037] As an optional solution, in this embodiment, the ball pair seat is hinged to a connecting seat through a pin, and the connecting seat is welded to the push plate, preferably welded at 1 / 4 of the length of the push plate to ensure the connection strength, and the angle between the connecting seat and the upper plane of the push plate is 45°-60°. The rotation angle of the ball pair is universal, and no matter what the swing direction of the spiral push plate is, the push rod is not constrained in the direction of movement because of the universal structure of the ball pair assembly and the hinge.

[0038] As an optional solution, the push rod in this embodiment is Z-shaped and the angles between adjacent folding rods are 120°-140°, which can prevent the push rod from being torsionally deformed and damaged by the impact of materials during operation. The push rod is a circular cross-section with a diameter of 25mm-50mm, preferably 27mm-48mm, and the shape and structural design strength meet the use requirements and are convenient for transmitting axial thrust. In this embodiment, the push rod adopts a crank structure, which meets the thrust transmission requirements and can resist the torsion force of the surrounding material impact.

[0039] Preferably, the axial spacing between the two push plates is 0.5 to 1 times the diameter of the drum dryer, and the two push plates and the hinge are centrally symmetrically arranged in end face projection.

[0040] As an optional solution, the push plate in this embodiment is a spiral plate with a spiral angle of 30°-60°, and the rotation direction of the push plate is consistent with the rotation direction of the drum dryer 11. The spiral push plate adopts the form of spiral blades, which is convenient for forming a spatial layout and can realize multi-directional movement, ultimately achieving axial push of the material.

[0041] As an optional solution, the material of the push plate and the push rod in this embodiment is hard metal or hard non-metal material, which can be aluminum alloy, stainless steel, carbon steel, etc.

[0042] The present embodiment is a set of pushing mechanisms that enhance the material movement rate and filling rate in the barrel. The material movement rate and filling rate of the barrel are improved, and the heat exchange efficiency is correspondingly improved; it is particularly suitable for materials with large stacking angles and light specific gravity, such as straw, etc.; it does not require additional power, and is only driven by the structural gravity generated by the rotation of the barrel itself, and the upper and lower spiral pushing plates interact with each other; the overall layout is compact, the design is relatively simple, the overall process equipment investment cost is low, modular operation can be achieved in the barrel, and the quantity can be adjusted according to the output requirements of the material to solve the problem of production volume.

[0043] The specific working principle and process of the pusher mechanism of this embodiment are as follows:

[0044] During the rotation of the drum dryer 11, when one push plate (rear push plate) and the hinge are at the top of the cylinder, the other push plate (front push plate) and the hinge are just at the lowest point of the cylinder, and these two linkage assemblies are connected by a push rod. Because of the component force of gravity, both push plates are in a downward swinging state. The difference is that the rear push plate is close to the center line of the cylinder and its component force pushes the push rod downward, while the front push plate swings downward away from the center line; the cylinder continues to rotate, and the front push plate begins to move upward to the cylinder, and under the action of the rotational force, it becomes the rear push plate state, and the pulling force generated by gravity is transmitted to the push rod. On the contrary, the original rear push plate rotates 180° to the bottom of the cylinder. Because of the action of the gravity component force, the rear push plate moves away from the center line of the cylinder, and the push rod transmits the gravity separation of the top spiral push plate, and then applies the component force to the lower spiral push plate. Because the angle and installation direction of the rear push plate are opposite to those of the front push plate, after being subjected to the pulling force, the opposite force also pulls the push plate to drive the material forward. In this way, the bottom spiral push plate can obtain two different thrusts. When the cylinder rotates one circle, the upper and lower push plates push axially back and forth alternately. The driving force mainly comes from the axial component of gravity of the material itself and the upper push plate. The motion trajectory of the push plate is not purely axial or circular, but a comprehensive motion trajectory with axial swing as the main and circular motion as the secondary.

[0045] The key of the present invention is to add an additional material pushing mechanism in the membrane drum dryer 11, but no additional driving mechanism is required, so as to forcefully push and arrange the materials in the drum, thereby increasing the moving speed of the materials and the filling rate in the drum.

[0046] Embodiment 2

[0047] like Figures 1 to 4 As shown, a drum dryer 11 is provided in this embodiment. Based on the above auxiliary pushing mechanism, the inner layer of the drum dryer 11 is provided with several groups of auxiliary pushing mechanisms, and the drum dryer 11 is arranged at an inclination angle of 2°-3°. The drum dryer 11 of this embodiment can be a membrane steam drum dryer, and several groups of auxiliary pushing mechanisms are welded on the internal heat exchange tubes, which is particularly suitable for drying light plant stem (straw) materials.

[0048] As an optional solution, both ends of the auxiliary pushing mechanism in this embodiment are evenly distributed along the circumferential direction of the drum dryer 11 , and the distance between adjacent auxiliary pushing mechanisms is at least 0.5 times the diameter of the drum dryer 11 .

[0049] In this embodiment, according to the material processing capacity in the drum dryer 11, multiple sets of linkage-combined auxiliary pushing mechanisms can be arranged inwardly in the drum.

[0050] like Figure 2 and Figure 3 As shown, when the material exceeds the height of the heat exchange tube, it will gather near the spiral push plate. The cylinder rotates, and the bottom push plate is moved forward by the axial component of the gravity of the top push plate, so that the nearby materials are pushed forward. The rotation direction of the push plate is consistent with the rotation direction of the cylinder, so as to ensure that the spiral direction of the push plate is forward. When the cylinder rotates, the upper and lower push plates are up and down each other due to the exchange of positions, and the gravity of the upper push plate provides the driving force for the lower push plate. In this way, the material at the bottom that exceeds the heat exchange tube will be continuously pushed forward, so that the material in the cylinder will not exceed the center line height of the cylinder, avoiding material accumulation while also preventing the upper push plate from losing its driving force due to obstruction. In addition, multiple sets of auxiliary push structures are arranged in the cylinder, which can significantly improve the material filling rate inside the cylinder, especially for materials with larger stacking angles and lighter specific gravity.

[0051] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An auxiliary pushing mechanism, characterized in that: It includes a push plate and a push rod, both ends of the push rod are movably connected to one end of the push plate, the other end of the push plate is hinged to the inner layer of the drum dryer, the end surface projections of the two push plates are located on the same diameter of the drum dryer, and the two push plates are provided with an axial spacing, the push plate located at the top of the drum dryer can swing by its own weight, and push the push rod and the push plate at the bottom to move along the discharge direction of the drum dryer.

2. The auxiliary pushing mechanism according to claim 1, characterized in that: The push plate is hinged to the heat exchange tube in the drum dryer through a hinge assembly, and the hinge assembly includes a connecting plate, a latch and a hinge seat. One end of the hinge seat is U-shaped and a rocker arm is welded to the other end. The rocker arm is welded to one end of the push plate. The U-shaped end of the hinge seat is plugged into the connecting plate and hinged through the latch. The connecting plate is welded to the inner layer of the drum dryer.

3. The auxiliary material pushing mechanism according to claim 1, characterized in that: The push plate is movably connected to the push rod via a ball pair assembly. The ball pair assembly includes a ball pair seat and a ball head that match each other. The push rod is welded to the ball head or connected to the ball head via bolts.

4. The auxiliary pushing mechanism according to claim 3 is characterized in that: The ball seat is hinged on a connecting seat through a latch, the connecting seat is welded to the push plate, and the angle between the connecting seat and the upper plane of the push plate is 45°-60°.

5. The auxiliary material pushing mechanism according to claim 1, characterized in that: The push rod is Z-shaped and the angles between adjacent folding rods are 120°-140°.

6. The auxiliary material pushing mechanism according to claim 1, characterized in that: The axial distance between the two push plates is 0.5 to 1 times the diameter of the drum dryer.

7. The auxiliary material pushing mechanism according to claim 1, characterized in that: The push plate is a spiral plate, the spiral angle of the spiral plate is 30°-60°, and the rotation direction of the push plate is consistent with the rotation direction of the drum dryer.

8. The auxiliary material pushing mechanism according to claim 1, characterized in that: The push plate and the push rod are made of hard metal or hard non-metal material.

9. A drum dryer, according to the auxiliary pushing mechanism of claim 1, characterized in that: The inner layer of the drum dryer is provided with a plurality of groups of auxiliary pushing mechanisms, and the drum dryer is arranged at an inclination angle of 2°-3°.

10. The drum drying machine according to claim 9, characterized in that: Both ends of the auxiliary pushing mechanism are evenly distributed along the circumferential direction of the drum dryer, and the distance between adjacent auxiliary pushing mechanisms is at least 0.5 times the diameter of the drum dryer.

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