Automatic knocking device for arc-shaped dewatering screen

Abstract

The utility model discloses an automatic knocking device for an arc-shaped dewatering screen, which comprises supports arranged on two sides of the arc-shaped screen, the supports on two sides are pivotally connected with a main shaft, the main shaft is fixedly connected with one end of a connecting rod, the other end of the connecting rod is connected with a knocking hammer, and one end side of the main shaft is provided with a motor, a speed reducer and a driving wheel which are in transmission connection. The driving wheel rotates to enable the driving rod to act on the contact rod, so that the main shaft rotates to lift the knocking hammer to a certain height, the driving wheel continues to rotate, the driving rod is separated from the contact rod, and the knocking hammer is driven to rotate by the contact rod. And the knocking hammer freely falls down to hammer the screen surface. And the labor intensity of workers is relieved, the moisture of centrifugal machine products is effectively reduced, the problem that screen seams of an arc-shaped screen are frequently blocked is solved, and the screen penetrating effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal washing and processing, and particularly relates to an automatic knocking device for an arc-shaped dewatering screen. Background Art

[0002] The main technological process of the coal washing system in our company's coal washery is as follows: lump coal heavy medium shallow trough separation → fine coal two-product heavy medium cyclone separation → coarse coal slime direct dewatering and recovery → fine coal slime flotation. In the coarse coal slime system of fine coal washing, the coarse coal slime is not sorted. The underflow of the classification cyclone enters the coal slime water bucket. After being concentrated by the thickening cyclone, it is then dehydrated and recovered through an arc-shaped screen and a centrifuge. Due to the unsorted coarse coal slime, the amount of coal slime in the coal washing water of the washing system is relatively large, and the load on the arc-shaped screen and the centrifuge is relatively large, resulting in poor dewatering effect, too low feed concentration of the centrifuge, too high moisture content of the product, and prone to coal quality accidents with excessive moisture; at the same time, there are many materials in the coarse coal slime with particle sizes equal to the screen slots of the arc-shaped screen, which is prone to blockage and jamming of the screen slots of the arc-shaped screen, and the dewatering effect is poor. During operation, the moisture content of the centrifuge product frequently exceeds the standard, resulting in a relatively high moisture content of the fine coal product coal.

[0003] Therefore, the workshop has taken a series of measures, including adjusting the scraper gap of the centrifuge, adjusting the amplitude of the arc-shaped screen, and regularly knocking the screen plate during the shift. Among them, regularly knocking the screen plate during the shift requires arranging workers, which has the technical problems of high labor intensity of workers, inability to ensure the knocking interval and force, and poor dewatering effect. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides an automatic knocking device for an arc-shaped dewatering screen, which has high dewatering efficiency and can save manpower.

[0005] The technical solution adopted by the utility model is as follows: an automatic knocking device for an arc-shaped dewatering screen includes supports arranged on both sides of the arc-shaped screen. The supports on both sides are pivotally connected to a main shaft. One end of a connecting rod is fixedly connected to the main shaft, and the other end of the connecting rod is connected to a knocking hammer. On one side of one end of the main shaft, there is a motor, a reducer, and a driving wheel connected in transmission. The driving wheel is provided with a dial rod at a position deviating from the center of the circle on the side close to the main shaft. A contact rod is radially arranged at the end of the main shaft. The knocking hammer freely falls on the screen surface of the arc-shaped screen. When the driving wheel rotates, the dial rod acts on the contact rod, so that the main shaft rotates to lift the knocking hammer to a certain height. When the driving wheel continues to rotate, the dial rod is separated from the contact rod, and the knocking hammer freely falls to hammer the screen surface.

[0006] Further, a first bearing is installed on the dial rod to rollingly contact the contact rod.

[0007] Further, the main shaft is pivotally connected to the support through a second bearing.

[0008] Further, two groups of connecting rods and knocking hammers are symmetrically arranged.

[0009] The utility model has the following beneficial effects:

[0010] The utility model has the advantages of simple structure, convenient processing, low cost, high working efficiency, etc. The designed structure is reasonable and reliable, the operation process is convenient and fast, which greatly reduces the labor intensity of workers, and the working efficiency is effectively improved. It can significantly improve the dehydration effect of the arc dehydration screen, reduce the feeding concentration of the centrifuge, improve the operating conditions of the centrifuge, and effectively reduce the product moisture. Description of the Drawings

[0011] Figure 1 is the front view of the utility model;

[0012] Figure 2 is the front view of the combination of the utility model and the arc screen;

[0013] Figure 3 is the side view of the arc screen of the utility model.

[0014] In the figure: 1, motor; 2, reducer; 3, driving wheel; 31, lever; 32, first bearing; 4, second bearing; 5, main shaft; 51, contact rod; 6, knocking hammer; 7, connecting rod; 8, arc screen; 9, support. Detailed Description of the Invention

[0015] In order to better understand the purpose, structure and function of the utility model, the following further describes in detail an automatic knocking device for an arc dehydration screen of the utility model with reference to the drawings.

[0016] As Figures 1 to 3 shown, an automatic knocking device for an arc dehydration screen includes supports 9 arranged on both sides of the arc screen 8. The supports 9 on both sides are pivotally connected to a main shaft 5. One end of a connecting rod 7 is fixedly connected to the main shaft 5, and the other end of the connecting rod 7 is connected to a knocking hammer 6. On one side of one end of the main shaft 5, there are a motor 1, a reducer 2 and a driving wheel 3 connected in transmission. On the side of the driving wheel 3 close to the main shaft 5 and deviating from the center of the circle, there is a lever 31. Radially arranged at the end of the main shaft 5 is a contact rod 51. The knocking hammer 6 freely falls on the screen surface of the arc screen 8. When the driving wheel 3 rotates, the lever 31 acts on the contact rod 51, so that the main shaft 5 rotates to lift the knocking hammer 6 to a certain height. When the driving wheel 3 continues to rotate, the lever 31 is disengaged from the contact rod 51, and the knocking hammer 6 freely falls to hammer the screen surface.

[0017] This device is mainly divided into two parts of mechanisms, namely a driving mechanism and an execution mechanism. The driving mechanism includes a motor 1 and a reducer 2, which are placed above the support. Specifically, a small motor and a small reducer are adopted, and the output speed of the reducer 2 is 12.5 r / min. The motor 1 is additionally controlled by a frequency converter to adjust the knocking frequency of the arc screen knocking device according to the screening effect, avoid ineffective high-frequency knocking, and prevent damage to the screen mesh.

[0018] The actuator is installed directly above the arc screen 8 and includes a main shaft 5, a knocking hammer 6 and a connecting rod 7. It is driven by a motor 1. The speed reducer 2 drives the driving wheel 3 to rotate. The lever 31 connected to the driving wheel 3 toggles the contact rod 51 of the actuator once every revolution, and the knocking hammer 6 of the actuator knocks the screen surface once. This cycle repeats to achieve the purpose of regularly knocking the screen surface.

[0019] In this embodiment, two groups of connecting rods 7 and knocking hammers 6 are symmetrically arranged. A first bearing 32 is installed on the contact section of the lever 31 and the contact rod 51 to change the shear friction to rolling friction, which can extend the service life of the lever 31 and improve the operation stability.

[0020] The main shaft 5 is pivotally connected to the support 9 through a second bearing 4, changing the original sliding friction to rolling friction, reducing the friction force and ensuring the service life of the transmission shaft.

[0021] A set of automatic knocking device for the arc dehydration screen is installed above the arc screen in the workshop, which not only reduces the labor intensity of workers, but also effectively reduces the moisture content of the centrifuge products, solves the problem of frequent blockage of the screen slots of the arc screen, and increases the screening effect.

[0022] It can be understood that the present utility model is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. An automatic knocking device for an arc dehydration screen, characterized in that It includes supports (9) arranged on both sides of an arc-shaped sieve (8). The supports (9) on both sides are pivotally connected to a main shaft (5). One end of a connecting rod (7) is fixedly connected to the main shaft (5), and the other end of the connecting rod (7) is connected to a percussion hammer (6). A motor (1), a speed reducer (2) and a driving wheel (3) which are in transmission connection are arranged on one end side of the main shaft (5). A shifting lever (31) is arranged at a position deviating from the center of the circle on the side of the driving wheel (3) close to the main shaft (5). A contact rod (51) is arranged radially at the end of the main shaft (5). The percussion hammer (6) freely falls on the sieve surface of the arc-shaped sieve (8). When the driving wheel (3) rotates, the shifting lever (31) acts on the contact rod (51), so that the main shaft (5) rotates to lift the percussion hammer (6) to a certain height. When the driving wheel (3) continues to rotate, the shifting lever (31) is disengaged from the contact rod (51), and the percussion hammer (6) freely falls to hammer the sieve surface.

2. The automatic knocking device for an arc dehydration screen according to claim 1, characterized in that, A first bearing (32) is installed on the shifting lever (31) and is in rolling contact with the contact rod (51).

3. The automatic knocking device for the arc dehydration screen according to claim 1, characterized in that, The main shaft (5) is pivotally connected to the support (9) through a second bearing (4).

4. The automatic knocking device for the arc dewatering screen according to any one of claims 1 to 3, characterized in that, Two groups of the connecting rods (7) and the percussion hammers (6) are symmetrically arranged.

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