A passive knocking drum screen with controllable opening and closing

Abstract

The present invention belongs to the technical field of chemical equipment, and specifically relates to a passive knocking drum screen with controllable opening and closing. The present invention includes a screen body and a hammer, the tail end of the hammer handle of the hammer is elastically hinged to the outer wall of the screen body through a hinge seat; the drum screen also includes an adjustable pull rod, the adjustable pull rod is hingedly installed on the frame through a hinge ear, and the hinge axis of the adjustable pull rod, the axis of the hinge seat at the hammer and the axis of the screen body are parallel to each other; a fork extends outward in a forked shape at the hammer handle of the hammer, and when the adjustable pull rod produces an articulated action so that the adjustable pull rod is in a low working state, the adjustable pull rod is located on the action path of the fork, thereby shifting the hammer to produce an elastic knocking action relative to the screen surface of the screen body. The present invention has the dual characteristics of controllable opening and closing and passive knocking, and can realize the knocking of the screen surface and the dredging of the screen holes without stopping the machine, and can ensure high screening efficiency while conveniently opening and closing.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a controllable opening and closing passive knocking drum screen. Background Art

[0002] The drum screen is a widely used machine in the chemical industry. Its function is to achieve sorting operations by controlling the particle size, and it has the characteristics of high sorting accuracy. When working, the drum device is installed on the frame at an angle; the motor is connected to the drum device through a coupling via a reducer to drive the drum device to rotate around its axis; when the material enters the drum device, the material on the screen surface flips and rolls due to the tilt and rotation of the drum device, so that the qualified material, that is, the product under the screen, is discharged through the discharge port at the bottom of the rear end of the drum, and the unqualified material, that is, the product on the screen, is discharged through the discharge port at the tail of the drum. Most of the materials in the chemical industry have the phenomenon of agglomeration and hardening, so it is very easy to cause the problem of blockage of the screen holes on the screen surface; and once the screen holes are blocked, it will affect the actual working efficiency of the drum screen. At present, the dredging of the screen holes of the drum screen can be achieved by external force knocking with a continuously vibrating vibration motor. The disadvantage is that an additional knocking power supply is required. The additional knocking power supply occupies production energy, and the screen surface of the drum screen is continuously rotating when it is in operation. How to install the knocking power supply and ensure that there is no working interference between the lead of the knocking power supply and the machine is a headache for people. Or an iron box with a built-in steel ball can be used to achieve continuous knocking. The disadvantage is that once installed, it is always in working state and cannot be turned off. For blocked screen holes, it may be possible to turn on the knocking periodically as appropriate. Continuous passive knocking that cannot be turned off will continuously produce violent working noise, seriously interfering with the normal working progress on site. Therefore, it needs to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a passive knocking drum screen with controllable opening and closing; the present invention has the dual characteristics of controllable opening and closing and passive knocking, and can realize the screen surface knocking and screen hole dredging operations without stopping the machine, and can ensure high screening efficiency while conveniently opening and closing.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A controllable opening and closing passive knocking type drum screen comprises a cylindrical screen body, characterized in that: the drum screen also comprises a hammer, the tail end of the hammer handle of the hammer is elastically hinged to the outer wall of the screen body through a hinge seat, so that the hammer head of the hammer always has an elastic restoring force to perform an articulated knocking action in the direction of the screen surface of the screen body, and the restoring direction of the elastic restoring force is in the same direction as the rotation direction of the screen body; the drum screen also comprises an adjustable pull rod, the adjustable pull rod is hingedly installed on the frame through a hinge ear, and the hinge axis of the adjustable pull rod, the axis of the hinge seat at the hammer and the axis of the screen body are all parallel to each other; a fork extends outwardly in a forked manner at the hammer handle of the hammer, and when the adjustable pull rod produces an articulated action so that the adjustable pull rod is in a low working state, the adjustable pull rod is located on the action path of the fork, thereby moving the hammer to produce an elastic knocking action relative to the screen surface of the screen body.

[0006] Preferably, mounting holes are arranged through the hammer handle, and the mounting holes are arranged in sequence along the length direction of the hammer handle. Matching holes are provided on the screen surface of the screen body, and the mounting holes and the matching holes correspond one to one to fix the two ends of the tension spring respectively.

[0007] Preferably, the connection point between the root of the shift fork and the hammer handle is located at 1 / 3 of the length from the hammer head to the tail end of the hammer handle on the hammer handle; and the shift fork is in the shape of a curved arc rod and satisfies the following formula:

[0008] y=0.84x 2 -0.23x.

[0009] Preferably, the hammers with hinged seats are in more than two groups and are arranged in sequence along the axial direction of the screen body, so that the hammers extending along the axial direction of the screen body form a row of striking units, and the striking units are in four rows and are arranged in sequence around the circumference of the screen body.

[0010] Preferably, a knocking plate is provided at a position of the screen surface of the screen body that can be struck by a hammer, and the knocking plate is extended in the axial direction of the screen body in its length direction; extension rods are extended circumferentially along the screen body on both side edges of the knocking plate, and the ends of the extension rods and the extension rods on the knocking plates at adjacent knocking units are close to each other and there is a gap between them; among the ends of the two extension rods close to each other, the end of one of the extension rods is provided with a tuning fork-shaped structure, and the end of the other extension rod extends into the area where the tuning fork-shaped structure is located.

[0011] Preferably, the tuning fork-shaped structure is a fishbone shape, a C shape, or a U shape.

[0012] Preferably, an articulated positioning shaft is fixed on the frame, the articulated positioning shaft is articulated with the articulated ear, the length direction of the adjustable pull rod is parallel to the axial direction of the articulated positioning shaft, and the same end of the adjustable pull rod and the articulated positioning shaft are fixed by the articulated ear; a hand wheel is coaxially mounted on one of the shaft ends of the articulated positioning shaft.

[0013] The beneficial effects of the present invention are:

[0014] 1) Abandoning the traditional vibration knocking method that requires active power supply and cannot be opened and closed passively, we seek a balance between the two, thus obtaining a new design structure that combines active opening and closing with passive knocking. In actual work, the hammer is elastically hinged to maintain the hammer's knocking state on the screen surface; and each knock of the hammer is achieved by the movement of the fork; the movement of the fork is achieved by the adjustable pull rod installed on the frame outside the screen surface. By controlling the high and low positions of the adjustable pull rod, the "switch" of the hammer's knocking is controlled, and the screen surface dredging needs without external power are met.

[0015] At this point, the present invention has the dual characteristics of controllable opening and closing and passive knocking, and can realize screen surface knocking and screen hole dredging operations without stopping the machine. It can ensure high screening efficiency while conveniently opening and closing.

[0016] 2) Considering that the striking force of the hammer is related to its own elastic restoring force, the hinged seat itself can be a torsion spring seat, and a tension spring can be installed on the hammer handle in a matching manner; or the controllable adjustment function of the elastic restoring force itself can be directly achieved by the number of tension springs on the hammer handle to improve its practicality.

[0017] 3) As another core point of the present invention, the shift fork plays a key connection function, so its structural design is very important. The root of the shift fork is located at 1 / 3 of the length from the hammer head to the tail end of the hammer handle. With this position as the zero point, an upward and curved arc rod structure is formed, thereby achieving the most optimized striking state, ensuring that the adjustable pull rod can accurately and reliably move the shift fork every time, and the action reliability performance is optimized.

[0018] 4) The design of the knocking plate aims to increase the striking range of each hammer, and to control the material on the screen surface in a large enough area to escape from the screen holes each time the hammer hits the ground. The end of the extension rod with a tuning fork-like structure not only makes the extension rod as a whole present a top-heavy structure, but also makes the end of the extension rod fluctuate more obviously and the far-end vibration feel more enhanced each time the knocking plate is struck; at the same time, the tuning fork-like structure also makes the overall vibration better, and the screen hole dredging effect can be significantly improved.

[0019] 5) As for the adjustable pull rod, since it needs to match the row-type striking units, the adjustable pull rod itself is also a long rod structure arranged in parallel with the hinged positioning axis. Whenever the present invention needs to start working, the hand wheel can be rotated to drive the adjustable pull rod to flip down until the adjustable pull rod is located on the travel path of the shift fork, so as to achieve the shifting of the shift fork and the striking of the hammer. It is flexible and convenient to use, the striking units in each row are highly synchronized, and the work is reliable and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 , Figure 3 , Figure 4 and Figure 5 It is the working state flow chart of hammer;

[0022] Figure 6 The figure is a diagram showing the matching state of the adjustable pull rod and the articulated positioning shaft;

[0023] Figure 7 A diagram showing the arrangement of one embodiment of an extension rod;

[0024] Figure 8 and Fig. 9 Two other embodiments of the extension rod are shown.

[0025] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0026] 10-screen body; 20-hammer; 21-shift fork; 22-tension spring; 23-hinged seat;

[0027] 31-adjustable pull rod; 32-hinged ear; 33-hinged positioning shaft; 34-hand wheel;

[0028] 41- striking plate; 42- extension rod; 43- tuning fork-like structure. DETAILED DESCRIPTION

[0029] For ease of understanding, here we combine Figure 1-9 The specific structure and working mode of the present invention are further described as follows:

[0030] The specific structure of the present invention is as follows Figure 1-9 As shown, the whole is installed on the screen body 10 and the frame of the drum screen as an accessory of the traditional drum screen; the main structure includes a hammer 20 and an adjustable pull rod 31, wherein:

[0031] The arrangement position of hammer 20 is as follows: Figure 1-5 As shown, it includes a hammer handle and a hammer head, the tail end of the hammer handle is hinged to the screen surface of the screen body 10 through a hinge seat 23, the entire hammer head is tilted forward along the rotation direction of the screen body 10, and is tightened by a tension spring 22 to ensure that the hammer head can hit the knocking plate 41 on the screen surface of the screen body 10. In order to achieve the controllability of the knocking force of the hammer 20, in addition to the controllable force of the hammer 20, it can also be achieved by increasing or decreasing the number of tension springs 22.

[0032] The hammer 20 is driven by a fork 21 on the hammer handle. The fork 21 is in the shape of an arc rod, and its root is installed at the 1 / 3 position from the hammer head to the tail end of the hammer handle. With this position as the zero point, an arc structure is formed according to the following formula: y = 0.84x2 -0.23x.

[0033] In practical verification, the following table shows the statistics of the number of failed strikes / total number of toggles of hammer 20:

[0034]

[0035] Table 1 Statistics of hammer failure times / total number of toggling times

[0036] As can be seen from Table 1, through the continuous test in the laboratory, the shift fork 21 formed by the curve equation of the present invention can achieve a 100% striking success rate of the hammer 20, and the effect is remarkable. However, the conventional arc structure or even straight-line shift fork 21 may have a series of problems such as slipping after being moved, or driving the hammer head to rise low after being moved, resulting in too small striking force, which are all classified as striking failures.

[0037] In actual design, since the sieve body 10 is as follows Figure 7 As shown in the figure, the hammer 20 for point-like striking has a long straight cylindrical shape. Therefore, how to ensure a sufficiently large striking range while ensuring the striking force is a point that needs attention. In this regard, the present invention, on the one hand, forms a striking system by arranging multiple rows of striking units, that is, in a dot matrix arrangement; on the other hand, the striking coverage is ensured by setting a striking plate 41. In addition, the striking plate 41 itself also extends an extension rod 42 outward, thereby further expanding the radiation range of its striking force. For the extension rod 42, when the adjacent ends of the extension rods 42 of two adjacent striking plates 41 are close to each other, a tuning fork-shaped structure 43 is arranged at the top thereof; when the striking vibration reaches this place, there can be a certain amplification effect to ensure the vibration of the far end; practice has proved that the effect is significant.

[0038] As for the adjustable pull rod 31, since it needs to match the row-type striking units, the adjustable pull rod 31 itself is also a long rod structure arranged parallel to the hinged positioning shaft 33. Whenever the present invention needs to start working, the rotating hand wheel 34 can drive the adjustable pull rod 31 to flip down through the hinged positioning shaft 33 and the hinged ear 32 until the adjustable pull rod 31 is located on the travel path of the fork 21, so as to achieve the work of shifting the fork 21 and striking the hammer 20. It is flexible and convenient to use, the striking units in each row are highly synchronized, and the work is reliable and stable.

[0039] Of course, it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0041] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A controllable opening and closing passive percussion drum screen, comprising a cylindrical screen body (10), characterized in that: The drum screen also includes a hammer (20), the tail end of the hammer handle of the hammer (20) being elastically hinged to the outer wall of the screen body (10) via a hinge seat (23), so that the hammer head of the hammer (20) always has an elastic restoring force for performing an articulated knocking action in the direction of the screen surface of the screen body (10), and the restoring direction of the elastic restoring force is in the same direction as the rotation direction of the screen body (10); the drum screen also includes an adjustable pull rod (31), the adjustable pull rod (31) being hingedly mounted on the frame via a hinge ear (32), The hinge axis of the adjustable pull rod (31), the axis of the hinge seat (23) at the hammer (20), and the axis of the screen body (10) are all parallel to each other; a fork (21) extends outwardly in a forked shape at the hammer handle of the hammer (20); when the adjustable pull rod (31) is hinged so that the adjustable pull rod (31) is in a low-position working state, the adjustable pull rod (31) is located on the action path of the fork (21), thereby moving the hammer (20) to generate an elastic knocking action relative to the screen surface of the screen body (10); The connection point between the root of the shift fork (21) and the hammer handle is located at 1 / 3 of the length from the hammer head to the tail end of the hammer handle on the hammer handle; and the shift fork (21) is in the shape of a curved arc rod and satisfies the following formula: 。 2. A controllable opening and closing passive knocking drum screen according to claim 1, characterized in that: The hammer handle is penetrated by mounting holes, each mounting hole being arranged in sequence along the length direction of the hammer handle, and a matching hole is provided on the screen surface of the screen body (10), and the mounting holes and the matching holes correspond one to one to fix the two ends of the tension spring (22) respectively.

3. A controllable opening and closing passive knocking drum screen according to claim 1 or 2, characterized in that: The hammers (20) with hinged seats (23) are in more than two groups and are arranged in sequence along the axial direction of the screen body (10), so that the hammers (20) extending in the axial direction of the screen body (10) form a row of striking units, and the striking units are in four rows and are arranged in sequence around the circumference of the screen body (10).

4. The controllable opening and closing passive knocking drum screen according to claim 3 is characterized by: A striking plate (41) is provided at a portion of the screen surface of the screen body (10) that can be struck by a hammer, and the striking plate (41) is extended in the axial direction of the screen body (10) in the length direction; extension rods (42) are extended in the circumferential direction of the screen body (10) at both side edges of the striking plate (41); the ends of the extension rods (42) and the extension rods (42) on the striking plates (41) at adjacent striking units are close to each other and there is a spacing; at the ends of the two extension rods (42) close to each other, a tuning fork-shaped structure (43) is provided at the end of one of the extension rods (42), and the end of the other extension rod (42) extends into the area where the tuning fork-shaped structure (43) is located.

5. The controllable opening and closing passive knocking drum screen according to claim 4 is characterized in that: The tuning fork-shaped structure (43) is in a fishbone shape, a C shape, or a U shape.

6. A controllable opening and closing passive knocking drum screen according to claim 1 or 2, characterized in that: An articulated positioning shaft (33) is fixed on the frame, and the articulated positioning shaft (33) is articulated with the articulated ear (32). The length direction of the adjustable pull rod (31) is parallel to the axial direction of the articulated positioning shaft (33), and the same end of the adjustable pull rod (31) and the articulated positioning shaft (33) are fixed via the articulated ear (32); a hand wheel (34) is coaxially mounted on one of the shaft ends of the articulated positioning shaft (33).

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