Electric beating device for arc screen of coal preparation plant

Abstract

The utility model relates to utilize the technical field of dewatering of arc screen, especially, relate to a kind of electric beating device for coal preparation plant arc screen, including drive unit, rotating mechanism and beating mechanism, the beating mechanism includes spring and horizontal beating pole, its core technical scheme lies in, rotating mechanism drives beating mechanism to move along motion locus, in the process of being lifted to beating mechanism, its own weight makes spring be compressed to store energy;When beating mechanism falls back to the lowest point of its motion locus, horizontal beating pole impacts arc screen.The utility model can also adjust the pre-tightening force of spring by the first adjusting mechanism including upper spring adjusting plate and lower spring adjusting plate, and adjust the depth of beating by adjusting the length of vertical beating pole as second adjusting mechanism.Solve the problems of easy clogging of arc screen, damage equipment and affect product quality in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of dewatering technology using arc screens, and in particular to an electric striking device for arc screens in coal preparation plants. Background Technology

[0002] In traditional heavy media coal preparation processes, after raw coal is separated by a three-product heavy media hydrocyclone, the less dense clean coal and qualified medium liquid enter an arc screen for dewatering and demediuming. However, fine clean coal with a particle size of 3-5 mm is sticky due to its physical properties. In a medium liquid with a density between 1.2 and 1.4 g / cm³, it easily adheres to and accumulates on the screen surface of the arc screen, making it unable to pass smoothly through the screen openings and severely affecting production efficiency.

[0003] To solve this problem, existing technologies typically employ the following methods:

[0004] (1) A vibrating motor is installed on the arc screen, but this brings a problem: if the amplitude is too small, it is not enough to overcome the adhesion of fine coal, and the unblocking effect is negligible; conversely, if a large amplitude is used to ensure the effect, long-term strong vibration will impact the metal structure of the arc screen. This leads to screen deformation, weld cracking, and ultimately causes the arc screen to be scrapped prematurely, directly increasing production costs.

[0005] (2) High-pressure water jets are used to impact the piled coal. Although this method can clean it up in time, it will introduce a large amount of additional water, dilute the downstream heavy medium suspension, cause its density to run out of control, directly affect the sorting accuracy, and cause the final product quality to be unstable.

[0006] (3) Relying on manual physical cleaning not only greatly increases the labor intensity and safety risks of on-site workers, but also significantly increases labor costs, which runs counter to the trend of automated production.

[0007] Therefore, how to provide a way to overcome material adhesion and solve the problem of arc screen clogging in an efficient and automated manner without damaging the equipment or affecting product quality is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0008] In order to solve the above-mentioned technical problems in the prior art, the present invention provides an electric striking device for an arc screen in a coal preparation plant.

[0009] To achieve the above objectives, the technical solution of this utility model is as follows:

[0010] An electric striking device for an arc screen in a coal preparation plant, comprising a drive unit;

[0011] A rotating mechanism driven by the drive unit, wherein the rotating mechanism is provided with a ratchet connecting rod;

[0012] A striking mechanism is connected to the rotating mechanism via a ratchet connecting rod. The striking mechanism includes: a hollow sleeve, a vertical striking rod that can slide axially along the sleeve wall inside the sleeve, and a horizontal striking rod disposed at the lower end of the vertical striking rod.

[0013] The sleeve contains a spring, and the vertical striking rod is positioned below the spring. Upon impact, the vertical striking rod can compress the spring.

[0014] Furthermore, a first adjustment mechanism is also provided inside the sleeve. The first adjustment mechanism includes an upper spring adjustment plate and a lower spring adjustment plate. The spring is disposed between the upper spring adjustment plate and the lower spring adjustment plate. The lower part of the lower spring adjustment plate supports the vertical striking rod. The position of the upper spring adjustment plate can be adjusted and fixed along its axial direction inside the sleeve, while the lower spring adjustment plate cannot be fixed.

[0015] Furthermore, the vertical striking rod is a telescopic rod.

[0016] Furthermore, the upper end of the vertical striking rod is provided with a limiting flange, and the lower end opening of the sleeve is provided with a stop for cooperating with the limiting flange.

[0017] Furthermore, it also includes a control system comprising a time relay for controlling the start and stop of the drive unit.

[0018] Furthermore, the drive unit includes a motor, a reducer, and a reducer and motor mounting bracket for fixing;

[0019] The electric motor is connected to the speed reducer, and the output shaft of the speed reducer is connected to the rotating mechanism.

[0020] Furthermore, the rotating mechanism is a ratchet mechanism, which includes an inner ratchet and an outer ratchet, wherein the reducer in the drive unit is connected to the inner ratchet to drive it to rotate, and the inner ratchet is used to drive the outer ratchet to rotate in one direction.

[0021] The ratchet connecting rod is fixedly connected to the center of the side disc of the outer ratchet, and the other end of the ratchet connecting rod is fixedly connected to the upper end of the sleeve.

[0022] Furthermore, the outer periphery of the inner ratchet is provided with stationary ratchet teeth, and the inner wall of the outer ratchet is provided with at least one pivotable movable ratchet tooth.

[0023] Furthermore, the horizontal striking bar is made of rubber material.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This utility model provides an electric striking device for an arc screen in a coal preparation plant. It adopts a unique working mechanism of "gravity drive and free fall". The striking force mainly depends on the weight of the striking mechanism itself and the rotation speed of the drive unit, forming a stable and effective impact. When the striking mechanism falls back to the lowest point of the movement trajectory, the spring assembly in the device plays a key auxiliary role. By providing buffering and quick reset functions, it ensures the reliability of the contact between the horizontal striking rod and the screen surface and the consistency of each striking action, thereby effectively loosening and knocking off the clean coal adhering to the screen surface of the arc screen.

[0026] This utility model provides an electric impact device for an arc screen in a coal preparation plant, which allows for precise adjustment of the impact depth. Operators can set the most suitable impact parameters based on different working conditions such as the moisture content and viscosity of the raw coal. This ensures effective unblocking while avoiding excessive impact, maximizing equipment protection, extending the service life of the arc screen, and reducing production costs.

[0027] This utility model provides an electric impact device for an arc screen in a coal preparation plant. By using a time relay or integrating it into a host computer system, the device's operating time is effectively reduced, and its service life is extended. At the same time, the application of a speed reducer also reduces the power requirements of the electric motor, achieving energy saving and consumption reduction. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A diagram showing the installation of the impactor.

[0030] Figure 2 This is a schematic diagram of the ratchet mechanism of the striking device.

[0031] Figure 3 This is a schematic diagram of the striking mechanism.

[0032] The annotations in the attached figures are explained as follows:

[0033] 1-Motor, 2-Reducer, 3-Reducer and motor mounting bracket, 4-Motor power output shaft, 5-Reducer power input port, 6-Time relay, 7-Wire, 9-Ratchet mechanism, 10-Outer ratchet, 11-Inner ratchet, 12-Moving ratchet, 13-Stationary ratchet, 14-Ratchet connecting rod, 15-Strike mechanism, 16-Strike rod connection, 17-Vertical strike rod, 18-Horizontal strike rod, 19-Spring, 20-Upper spring adjusting plate, 21-Lower spring adjusting plate, 22-Sleeve, 23-Limit flange. Detailed Implementation

[0034] The technical solution of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of this utility model.

[0036] The following description of exemplary embodiments is merely illustrative and is not intended to limit the present invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0037] This embodiment provides an electric striking device for an arc screen in a coal preparation plant, which mainly includes a drive unit, a rotating mechanism, and a striking mechanism 15.

[0038] like Figure 1 As shown, the drive unit includes a motor 1, a reducer 2, and a reducer and motor mounting bracket 3 for fixing them. The motor 1 transmits power to the reducer 2 via its motor power output shaft 4. The reducer 2 receives power through its reducer power input port 5, reduces the power, increases the torque, and then drives the rotating mechanism. The start and stop of the entire drive unit are controlled by a control system, which may include a time relay 6 connected via a wire 7, used to set the striking time interval. This control system can also be configured into the factory's PLC host computer or DCS system to achieve fully automated control.

[0039] In this embodiment, the rotating mechanism is a ratchet mechanism 9. For example... Figure 2As shown, the ratchet mechanism 9 includes an outer ratchet 10, an inner ratchet 11, a movable ratchet 12, and a stationary ratchet 13. Its working principle is similar to a ratchet wrench or a bicycle freewheel: the inner ratchet 11 has a stationary ratchet 13 on its outer circumference, and the inner wall of the outer ratchet 10 has at least one pivotable movable ratchet 12. When the inner ratchet 11 rotates clockwise, its stationary ratchet 13 pushes the movable ratchet 12, causing the movable ratchet 12 to engage with the inner wall of the outer ratchet 10, thereby transmitting power to the outer ratchet 10 and causing it to rotate in the same direction. When the striking mechanism 15 falls back due to gravity, causing the outer ratchet 10 to rotate faster than the inner ratchet 11, the movable ratchet 12 retracts inward, sliding past the stationary ratchet 13, achieving a rapid, resistance-free return. This unidirectional drive characteristic ensures the reliability of the subsequent rotating mechanism's lifting process and the smoothness of the falling process.

[0040] Striking mechanism 15 Figure 1 and Figure 3 As shown, one end of the ratchet connecting rod 14 is fixed to the side disc of the outer ratchet 10 by bolts or welding, and connected to the rotation center of the side disc; the other end of the ratchet connecting rod 14 is connected to the striking rod connection 16 provided on the sleeve 22 of the striking mechanism 15. In this way, the rotational motion of the outer ratchet 10 is converted into the overall circular motion of the striking mechanism 15, and it is placed in a suspended installation state. When the ratchet mechanism 9 rotates, it can drive the striking mechanism 15 to rotate at the same frequency. The striking mechanism 15 mainly consists of a vertical striking rod 17, a horizontal striking rod 18, a spring 19, a sleeve 22, an upper spring adjusting plate 20, and a lower spring adjusting plate 21. The sleeve 22 is a hollow structure, and the vertical striking rod 17 is a telescopic rod housed within the sleeve 22, allowing it to slide freely up and down within the sleeve. The bottom of the vertical striking rod 17 connects to the horizontal striking rod 18, and the top of the vertical striking rod 17 is provided with a limiting flange 23. Correspondingly, a retaining ring serves as a stop at the lower opening of the sleeve 22. During the operation of the striking mechanism 15, the vertical striking rod 17 reciprocates rapidly and frequently within the sleeve 22 during impact and rebound. The presence of the limiting flange ensures that the maximum extension stroke of the vertical striking rod 17 is limited by this limiting structure. When the vertical striking lever 17 moves downward to its limit position, the limiting flange 23 at its top will contact the stop inside the sleeve 22, thereby effectively preventing the vertical striking lever 17 from completely sliding out of the sleeve 22 due to unexpected huge rebound force or wear after long-term operation.

[0041] Among them, the horizontal impact bar 18 is the part that directly contacts the screen surface of the arc-shaped screen, and its material is preferably rubber to protect the screen surface from damage during the impact process.

[0042] The core technical solution and workflow of this utility model are as follows:

[0043] The first step is that the control system issues a command, the motor 1 starts, and after the reducer 2 reduces the speed and increases the torque, it drives the ratchet mechanism 9 to perform a unidirectional clockwise circular motion.

[0044] In the second step, the ratchet mechanism 9 drives the suspended striking mechanism 15 to rotate synchronously via the ratchet connecting rod 14. During this rotation, with the striking rod connection 16 as the center of rotation, the striking mechanism 15 moves upward in a circular motion trajectory. During the gradual rotation, the horizontal height of the vertical striking rod 17 and the horizontal striking rod 18 gradually increases. When the vertical striking rod 17 and the horizontal striking rod 18 exceed the horizontal height of the spring 19, they will gradually compress the spring 19 by their own gravity, thereby storing energy in the spring 19 in the form of elastic potential energy.

[0045] Thirdly, when the striking mechanism 15 reaches the highest point of its trajectory, the gravitational component of the striking mechanism 15 and the elastic potential energy stored in the spring 19 of the striking mechanism 15 during this process will be gradually released, causing the striking mechanism 15 to accelerate downward along the circular trajectory. The unidirectional drive characteristic of the ratchet mechanism 9 allows the striking mechanism 15 to break away from synchronous rotation and fall freely back along the trajectory under the action of gravity. During this process, gravitational potential energy begins to be converted into kinetic energy.

[0046] Fourthly, when the striking mechanism 15 reaches the lowest point of its trajectory, the kinetic energy converted from gravitational potential energy during its descent reaches its maximum. This energy is then precisely impacted on the arc-shaped screen surface by the horizontal striking rod 18 with short, powerful pulses, thereby loosening and knocking off the adhering coal. During this process, the spring 19 acts as a buffer, ensuring that the horizontal striking rod 18 maintains effective contact with the screen surface throughout the impact. After the impact, its elasticity allows the vertical striking rod 17 to quickly return to its original position, preparing for the next strike, thus ensuring the continuity and consistency of the impact.

[0047] After one impact, the ratchet mechanism 9 continues to rotate, driving the striking mechanism 15 to perform another "lift-impact" cycle.

[0048] This embodiment features dual adjustability to adapt to different operating conditions:

[0049] 1. Adjustment of Spring Preload: The initial preload of spring 19 can be changed through the first adjustment mechanism, namely the upper spring adjustment plate 20 and the lower spring adjustment plate 21. The upper spring adjustment plate 20 is movable within the sleeve 22, but can be fixed after the adjustment position is determined. The lower spring adjustment plate 21 is free to move within the sleeve 22. By adjusting the position of the upper spring adjustment plate 20 within the sleeve 22, the compressible stroke of the spring can be changed. Reducing the compression stroke allows for faster reset of the vertical striking rod and enhances the buffering effect when the horizontal striking rod contacts the screen surface; increasing the compression stroke has the opposite effect. This adjustment function is used to optimize the smoothness and reliability of the device's operation under different speeds and working conditions.

[0050] 2. Adjustment of Impact Depth: Impact depth refers to the position where the horizontal striking rod can impact the surface of the arc-shaped screen. This is achieved through a second adjustment mechanism, namely, adjusting the vertical striking rod 17. The vertical striking rod 17 is positioned within the sleeve 22 and can move vertically up and down within the sleeve 22. Since the vertical striking rod 17 is a telescopic rod structure, controlling its length controls the extension length of the horizontal striking rod 18, thereby changing the overall stroke length of the striking mechanism 15 and thus controlling the depth and position of the horizontal striking rod 18 impacting the arc-shaped screen.

[0051] The above specific embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An electric striking device for an arc screen in a coal preparation plant, characterized in that: Includes a drive unit; A rotating mechanism driven by the drive unit, wherein the rotating mechanism is provided with a ratchet connecting rod; A striking mechanism is connected to the rotating mechanism via a ratchet connecting rod. The striking mechanism includes: a hollow sleeve, a vertical striking rod that can slide axially along the sleeve wall inside the sleeve, and a horizontal striking rod disposed at the lower end of the vertical striking rod. The sleeve contains a spring, and the vertical striking rod is positioned below the spring. Upon impact, the vertical striking rod can compress the spring.

2. The electric striking device for an arc screen in a coal preparation plant according to claim 1, characterized in that: The sleeve is also provided with a first adjustment mechanism, which includes an upper spring adjustment plate and a lower spring adjustment plate. The spring is disposed between the upper spring adjustment plate and the lower spring adjustment plate, and the lower part of the lower spring adjustment plate supports the vertical striking rod. The position of the upper spring adjustment plate can be adjusted and fixed along its axial direction within the sleeve, while the lower spring adjustment plate cannot be fixed.

3. The electric striking device for an arc screen in a coal preparation plant according to claim 1, characterized in that: The vertical striking rod is a telescopic rod.

4. The electric striking device for an arc screen in a coal preparation plant according to claim 3, characterized in that: The upper end of the vertical striking rod is provided with a limiting flange, and the lower end opening of the sleeve is provided with a stop for cooperating with the limiting flange.

5. The electric striking device for an arc screen in a coal preparation plant according to claim 1, characterized in that: It also includes a control system containing time relays for controlling the start and stop of the drive unit.

6. The electric striking device for an arc screen in a coal preparation plant according to claim 1, characterized in that: The drive unit includes a motor, a reducer, and a reducer and motor mounting bracket for fixing. The electric motor is connected to the speed reducer, and the output shaft of the speed reducer is connected to the rotating mechanism.

7. An electric striking device for an arc screen in a coal preparation plant according to claim 6, characterized in that: The rotating mechanism is a ratchet mechanism, which includes an inner ratchet and an outer ratchet. The reducer in the drive unit is connected to the inner ratchet to drive its rotation, and the inner ratchet is used to drive the outer ratchet to rotate in one direction. The ratchet connecting rod is fixedly connected to the center of the side disc of the outer ratchet, and the other end of the ratchet connecting rod is fixedly connected to the upper end of the sleeve.

8. An electric striking device for an arc screen in a coal preparation plant according to claim 7, characterized in that: The inner ratchet has stationary ratchet teeth on its outer periphery, and the outer ratchet has at least one pivotable movable ratchet tooth on its inner wall.

9. An electric striking device for an arc screen in a coal preparation plant according to claim 1, characterized in that: The horizontal striking bar is made of rubber.

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