Anti-blocking self-cleaning gravel vibration screening device

Abstract

The utility model discloses an anti-blocking self-cleaning gravel vibration screening device which comprises a screening box support, a screening box arranged on the screening box support, a vibration screening motor arranged on the screening box, a screen arranged in the screening box and used for conducting vibration screening on gravel, and a plurality of knocking assemblies. The screen is sequentially divided into a plurality of screening faces in the length direction of the screen. The knocking assemblies and the screening faces are arranged in a one-to-one correspondence mode. Each knocking assembly comprises a plurality of magnetic knocking bodies evenly arranged below the screen in the width direction of the screen, connecting ropes evenly distributed in a radiation mode with the knocking bodies as the center and clamping pieces. One end of the connecting rope is connected with the knocking body, and the other end of the connecting rope is detachably connected with the screen through a clamping piece. The utility model solves the problem that the cleaning effect of the upper part of a screen is difficult to guarantee because a linear vibrating screen is often adopted for gravel screening in the field of engineering construction, but the screen is obliquely arranged and bouncing balls are gathered at the lower end part of the screen under the action of gravity.

Description

Technical Field

[0001] The utility model relates to an engineering crushed stone screening device, in particular to an anti-blocking and self-cleaning crushed stone vibration screening device. Background Art

[0002] In the field of infrastructure project construction, the use of self-produced flakes for crushing is a common on-site material production and supply method. Since the reserves of self-produced flakes are relatively small compared to large-scale crushing mines and the production mobility is large, the construction investment of the self-produced crushing production line is relatively small and the technical standards are relatively low. In order to reduce production costs, the flake parent materials, production lines, and finished product warehouses used in the self-produced crushing production lines are often stacked in the open air and do not have rainproof drying functions, resulting in a high moisture content in the flake parent materials and crushed stone mixed aggregates. What's more, in order to improve the cleanliness of machine-made sand, some production lines use wet production, which results in a higher moisture content in machine-made sand.

[0003] During the vibration screening process, due to the high moisture content of fine aggregates such as machine-made sand, stone powder, and stone chips, they often aggregate due to surface tension and capillary effect, blocking the sieve holes, making it impossible for some fine aggregates that should have passed through the sieve to pass through the sieve. As a result, they are mixed with coarse aggregates with a fineness modulus of 4.75-9.5 mm and directly transported out of the belt conveyor at this level, eventually causing the following problems: (1) The powder content of coarse aggregates with a fineness modulus of 4.75-9.5 mm exceeds the standard, the proportion of fine particles increases, and the gradation curve is poor, affecting the working performance of concrete. (2) The fineness modulus of fine aggregates below 4.75 mm is too coarse, and the gradation curve is poor, affecting the working performance of concrete. (3) The production efficiency is low, and the sieve needs to be stopped frequently to clean.

[0004] In this regard, because wet aggregate often blocks the screen, resulting in low screening efficiency and poor screening effect, production line managers often control the mesh size of the smallest screen to 4.5 mm, that is, by increasing the mesh size to reduce the probability of wet aggregate blocking. However, although increasing the screen size can reduce the frequency of stopping to clean the screen, it has the following disadvantages: (1) It further increases the proportion of coarse particles in fine aggregate with a fineness modulus below 4.75 mm, resulting in a poor grading curve and poor working performance of fine aggregate. (2) It increases the proportion of coarse particles in coarse aggregate with a fineness modulus of 4.75-9.5 mm, resulting in a poor grading curve, which affects the working performance of concrete.

[0005] At present, similar phenomena exist in the self-produced artificial sand for engineering construction projects across the country, including some commercial artificial sand from minerals, which leads to the generally coarse fineness modulus of artificial sand and poor grading curve, which cannot meet the demand for medium sand in Zone II. This will lead to poor working performance of concrete, increased difficulty in adjusting and controlling the mix ratio, increased dosage of cement and other cementitious materials, and higher requirements for admixtures, thereby greatly increasing the cost of concrete use.

[0006] In the process of crushing stone, the blockage of screen holes is caused by many factors. Generally, it is because the shape of the stone is irregular, there are more flaky particles or more critical particles in the mesh, the thickness of the screen wire, the shape of the mesh, the high moisture content of the material, etc., which cause the crushed stone to be stuck in the screen holes and difficult to remove. In this case, the general cleaning method is no longer applicable. Common targeted cleaning methods include high-pressure water flushing, brushing, and beating.

[0007] Among them, the beating method is to vibrate the screen by knocking on it, so that the particles stuck in the middle of the screen holes fall off to solve the blockage problem. Among them, the bouncing ball is a typical use of hitting the screen to achieve cleaning, which can effectively prevent the vibrating screen from being blocked. The bouncing ball is generally installed between the punching plate and the mesh frame of the vibrating screen. The power of the vibrating screen makes the bouncing ball hit back and forth between the punching plate and the mesh frame to clean the screen, which can increase the screening output. Although the bouncing ball method has many advantages, the bouncing ball itself has a small diameter and requires a sealed space to use. It is generally suitable for light and fine vibrating screen equipment such as rotary vibrating screens. Sand and gravel screening generally uses a large linear vibrating screen with an inclined screen. The use of bouncing balls will cause the bouncing balls to gather at the lower end of the screen due to gravity, making it difficult to ensure the cleaning effect on the upper part of the screen. In this regard, a Chinese patent (application number 2015200589463) discloses a screen plate installation structure with a vibrating device, which controls the movement range of the bouncing balls by setting a basket partition at the bottom, so that the impact of the bouncing balls is evenly distributed on the screen surface, and the problem of the bouncing balls gathering at the lower end is weakened. However, when used for an inclined linear vibrating screen, it is still difficult to fundamentally solve the problem of the bouncing balls gathering at the lower end of the screen due to gravity. On the other hand, the basket set at the bottom will affect the grading and screening of the screened materials, and the basket becomes another screen, causing fine aggregates to accumulate in the basket, reducing the screening efficiency. At the same time, the device has a complex structure, and the mass of the screen plate is greatly increased, which greatly increases the energy consumption of the vibrating screen, is not conducive to the vibration screening of the screen plate, and is not suitable for large equipment.

[0008] In addition, the Chinese patent (application number 2021228813728) discloses a vibrating self-cleaning vibrating screen plate, which is provided with a flexibly connected beating rod on the screen plate body. During the beating process of the vibrating screen, the beating rod can generate additional vibration driven by the screen machine and hit the screen surface, so that the particles stuck in the screen hole fall off. However, since the beating rod is connected only by one end, the bounce height of each section of the beating rod will be different, and the connection is close to the screen plate. The bounce amplitude of the rod body near the connection is small, the impact force is small, and the end bounce amplitude is large, and the impact force is large. Therefore, when hitting the screen plate, the exciting force of the impact is unevenly distributed, and the corners are difficult to clean in place; in addition, since the working principle of the beating rod itself is to bounce up and then fall down under the vibration of the screen plate to cause an impact on the screen plate, but because one end of the beating rod is fixed, it will greatly affect the bounce of the beating rod and the instantaneous impact force of hitting the screen plate, resulting in the need for the beating rod to reach a larger mass to achieve the expected effect, low cleaning efficiency, and high energy consumption. And because the motion trajectory design of the structure itself is too simple, the vibration cleaning effect of impact and knocking in the actual production process is extremely limited. Utility Model Content

[0009] The technical problem solved by the utility model is that a linear vibrating screen is often used for crushed stone screening in the field of engineering construction, but the screen is arranged obliquely, and the bouncing balls will gather at the lower end of the screen due to the effect of gravity, making it difficult to ensure the cleaning effect of the upper part of the screen.

[0010] The utility model is realized by the following technical solutions:

[0011] An anti-clogging self-cleaning gravel vibration screening device comprises a screen box support, a screen box arranged on the screen box support, a vibrating screen motor arranged on the screen box, and a screen mesh arranged in the screen box for vibrating and screening gravel, characterized in that it also comprises: a plurality of knocking components;

[0012] The screen is divided into a number of screening surfaces in sequence along its length direction; a number of the knocking components are arranged in one-to-one correspondence with the number of the screening surfaces, and the knocking components include a number of knocking bodies that are evenly arranged below the screen along the width direction of the screen and have magnetism, a connecting rope and a clamping piece that are evenly radiated with the knocking body as the center; one end of the connecting rope is connected to the knocking body, and the other end of the connecting rope is detachably connected to the screen through the clamping piece.

[0013] Preferably, the connecting piece is an electromagnetic type clip, which includes an upper clip fixed to the bottom of the screen with the clip facing downward, a lower clip fixed to the screen box bracket with the clip facing upward and cooperating with the upper clip, a lifting spring arranged in the lower clip, a magnetic fixing head accommodated in the slot formed by the lower clip and the upper clip, and a guide groove arranged on one side of the lower clip and offset from the upper clip; electromagnets are arranged inside the upper clip and the lower clip; the connecting rope passes through the guide groove and is connected to the fixing head.

[0014] Preferably, the utility model also includes a receiving assembly, which includes a lifting member fixed on the screen box bracket and located below the knocking body, a receiving groove arranged on the top of the lifting member for receiving the knocking body, and an electromagnet arranged in the receiving groove.

[0015] Preferably, the lifting member is a hydraulic cylinder or a pneumatic cylinder.

[0016] Preferably, along the length direction of the screen, the knocking components at the odd-numbered positions are all provided with n The striking components at the even-numbered positions are all provided with m percussion bodies, among which n ≠ m , 2≤ n ≤5, 2≤ m ≤5.

[0017] Preferably, the striking body is spherical or truncated cone-shaped, and the surface of the striking body is sprayed with a polytetrafluoroethylene coating.

[0018] Preferably, a filling cavity is provided inside the knocking body, and a filling hole connected to the filling cavity is provided on the outer wall of the knocking body, and a detachable sealing cover is covered on the filling hole; the filling cavity is filled with fillers of different weights to adjust the weight of the knocking body.

[0019] Preferably, the connecting rope is an elastic rope, and the striking body is connected to the connecting rope in no less than two directions.

[0020] 1) The utility model provides a knocking assembly in which the knocking bodies are arranged in a point shape under the screen through connecting ropes. It not only has the same advantages as the traditional bouncing ball cleaning screen, but also the knocking bodies will not gather with the inclination of the screen and will not affect the movement and screening of materials.

[0021] 2) In the present invention, since the knocking components are arranged in one-to-one correspondence with the screening surfaces, the knocking components can be installed on screening surfaces at different positions or numbers, so that the device of the present invention can realize the functions of global knocking, fixed-point knocking or global sleep, and has better flexibility of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the device;

[0023] Figure 2 It is a structural schematic diagram of the device when it is in global sleep mode;

[0024] Figure 3 It is a structural schematic diagram of a card connector;

[0025] Figure 4 It is a right side view of the card connector;

[0026] Figure 5 is a schematic diagram of the structure of the striking body;

[0027] Figure 6 A structural schematic diagram of one of the connection modes between the striking body and the connecting rope;

[0028] Figure 7 It is a structural schematic diagram of the second connection mode between the striking body and the connecting rope;

[0029] The meanings of the symbols in the above figure are: screen box bracket 1, screen box 2, receiving assembly 3, lifting member 301, receiving groove 302, screen 5, screening surface 501, knocking assembly 6, knocking body 601, filling cavity 6011, filling hole 6012, sealing cover 6013, connecting rope 602, clamping member 603, upper buckle 6031, fixing head 6032, lifting spring 6033, lower buckle 6034, guide groove 6035. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0032] The utility model is further described in detail below in conjunction with the accompanying drawings. Example

[0033] An anti-clogging self-cleaning gravel vibrating screening device, please refer to Figures 1 to 7 , comprising a screen box support 1, a screen box 2 arranged on the screen box support 1, a vibrating screen motor (not shown in the figure) arranged on the screen box 2, a screen 5 arranged in the screen box 2 for vibrating and screening the crushed stones, and a plurality of knocking components 6;

[0034] The screen 5 is divided into a plurality of screening surfaces 501 in sequence along its length direction; a plurality of the knocking components 6 are arranged in one-to-one correspondence with the plurality of the screening surfaces 501, and the knocking components 6 include a plurality of knocking bodies 601 which are evenly arranged below the screen 5 along the width direction of the screen 5 and have magnetism, a connecting rope 602 which is evenly radiated and distributed around the knocking body 601, and a clamping piece 603; one end of the connecting rope 602 is connected to the knocking body 601, and the other end of the connecting rope 602 is detachably connected to the screen 5 through the clamping piece 603;

[0035] In the above structure, since the knocking bodies 601 in the knocking assembly 6 are arranged in a point shape below the screen 5 through the connecting rope 602, the screen 5 drives the knocking bodies 601 to resonate through the connecting rope 602 to knock on the corresponding screening surface 501, and the knocking bodies will not gather at the bottom of the screen as the screen is tilted, and will not affect the movement and screening of the material; in addition, since several of the knocking assemblies 6 are arranged in a one-to-one correspondence with the screening surface 501, the knocking assemblies 6 can be installed on screening surfaces at different positions or numbers, so that the device of the utility model can realize the functions of global knocking, fixed-point knocking or global sleep. Yes; for example, the connecting ropes in the knocking components 6 under each screening surface 501 can be connected to the screen 5, so when the screen vibrates, all the knocking components 6 are working, and global knocking is performed at this time; or, only the connecting ropes in the knocking components 6 under the screen surface that needs to be knocked are connected to the screen 5, and the connecting ropes in the remaining positions are removed from the screen 5, so that fixed-point knocking can be achieved; or, the connecting ropes in the knocking components 6 under each screening surface 501 are removed from the screen 5, so when the screen vibrates, all the knocking components 6 will not work, and global sleep is performed at this time.

[0036] Further, in a preferred embodiment, see Figure 3 and Figure 4The clamping member 603 is an electromagnetic clamping member, which includes an upper clamping member 6031 fixed to the bottom of the screen 5 with the clamping port facing downward, a lower clamping member 6034 fixed to the screen box support 1 with the clamping port facing upward and cooperating with the upper clamping member 6031, a lifting spring 6033 arranged in the lower clamping member 6034, a fixing head 6032 with magnetic properties accommodated in the clamping slot formed by the lower clamping member 6034 and the upper clamping member 6031, and a guide slot 6035 arranged on one side of the lower clamping member 6034 and misaligned with the upper clamping member 6031; the upper clamping member 6031 and the lower clamping member 6034 are connected to the lower clamping member 6034, and the guide slot 6035 is arranged on the side of the lower clamping member 6034 and misaligned with the upper clamping member 6031; 034 is provided with an electromagnet (not shown in the figure); the connecting rope 602 passes through the guide slot 6035 and is connected to the fixed head 6032; the connecting rope 602 passes through the guide slot 6035 and is connected to the fixed head 6032; in the above structure, when it is necessary to connect the connecting rope 602 to the screen 5, the electromagnet in the upper buckle 6031 is controlled to be energized to continuously generate magnetic force, and the electromagnet in the lower buckle 6034 is controlled to be de-energized, and the fixed head 6032 is clamped and fixed in the upper buckle 6031 under the action of the magnetic force, and the connecting rope 602 passes through the fixed The fixed head 6032 and the upper buckle 6031 remain connected to the screen 5; similarly, when it is necessary to remove the connecting rope 602 from the bottom of the screen 5, the electromagnet in the upper buckle 6031 is powered off, and the electromagnet in the lower buckle 6034 is powered on to continuously generate magnetic force, so that the fixed head 6032 is clamped and fixed in the lower buckle 6034 under the action of the magnetic force, and the connecting rope 602 is disconnected from the screen 5; wherein, when the connecting rope 602 and the bottom of the screen 5 are switched from the connected state to the disassembled state, the fixed head 6032 is disconnected due to its own gravity and knocking. Under the action of the gravity of the body, the fixed head 6032 can fall from the upper buckle 6031 into the lower buckle 6034 more smoothly and be held by the lower buckle 6034; and when the connecting rope 602 and the bottom of the screen 5 are changed from the disassembled state to the connected state, the gravity of the fixed head 6032 itself and the gravity of the knocking body will hinder the upward movement of the fixed head 6032, and the lifting spring 6033 can be used to lift the fixed head 6032 to make it closer to the upper buckle 6031, which is conducive to the upper buckle 6031 to suck up and fix the fixed head 6032.

[0037] Further, in a preferred embodiment, see Figure 1 and Figure 2The utility model also includes a receiving assembly 3, which includes a lifting member 301 fixed on the screen box bracket 1 and located below the knocking body 601, a receiving groove 302 arranged at the top of the lifting member 301 for receiving the knocking body 601, and an electromagnet arranged in the receiving groove 302; when the connecting rope 602 is connected to the screen 5, the lifting member 301 is controlled to descend, thereby driving the receiving groove 302 to descend, so as to avoid the receiving assembly 3 interfering with the vibration of the knocking body 601; when the connecting rope 602 is removed from the screen 5, the lifting member 301 is controlled to rise, thereby driving the receiving groove 6042 to rise to the vibration center of the knocking body 601, and at the same time, the electromagnet in the receiving groove 6042 is controlled to be energized to generate magnetic force, so as to receive and fix the detached knocking body 601 through magnetic absorption. The above structure can facilitate the storage of the knocking body 601 without affecting the vibration of the knocking body.

[0038] Furthermore, in a preferred embodiment, the lifting member 604 is a hydraulic cylinder or a pneumatic cylinder.

[0039] Further, in a preferred embodiment, see Figure 6 and Figure 7 Along the length direction of the screen 5, the knocking components 6 at the odd-numbered positions are all arranged n The knocking bodies 601 are all provided with the knocking components 6 at the even-numbered positions. m knocking bodies 601, wherein n≠m, 2≤n≤5, 2≤m≤5; based on the above arrangement, since the numbers of knocking bodies in the knocking assemblies at adjacent positions are different, intermittent changes of different knocking forces and frequencies on the screen can be achieved to improve the knocking cleaning effect of the screen.

[0040] Further, in a preferred embodiment, see Figure 5 The striking body 601 is spherical or truncated cone-shaped, and the surface of the striking body 601 is sprayed with a polytetrafluoroethylene coating.

[0041] Further, in a preferred embodiment, see Figure 5 A filling cavity 6011 is provided inside the striking body 601, and a filling hole 6012 connected to the filling cavity 6011 is provided on the outer wall of the striking body 601. A detachable sealing cover 6013 is covered on the filling hole 6012; the filling cavity 6011 is filled with fillers of different weights to adjust the weight of the striking body 601.

[0042] Further, in a preferred embodiment, see Figure 6 and Figure 7 The connecting rope 602 is an elastic rope, and the striking body 601 is connected to the connecting rope 602 in no less than two directions.

[0043] In this utility model, please refer to Figure 6 and Figure 7 , the number of connecting ropes connected to each knocking body, the correlation pattern between the connecting ropes, and the mass, layout and position of the knocking body can be optimized according to various factors such as screen size, screen inclination angle, screen aperture, screen mass, vibration frequency of the vibrating screen, so as to reduce the energy consumption of vibration cleaning and improve the vibration screening effect; for example, firstly, according to the vibrating screen used, the information such as the vibrating screen model, excitation method, excitation frequency, screen size, screen aperture size, screening material type, material particle size, screen blockage and so on are statistically analyzed; secondly, the vibration of the knocking body is studied, and the influence of factors such as vibration screen excitation method, knocking body mass, connecting rope length, connecting rope stiffness, knocking body group combination method, connecting rope interaction method on the vibration of the knocking body is studied; by analyzing the knocking body in various factors The first to third order vibration modes under the influence of various factors are selected, and the vibration mode with the best knocking effect on the screen is selected as the design basis. Through experiments, the formula for the influence of various factors on the natural frequency of the knocking body is obtained, and the influence of the mass and amplitude of the knocking body on the effective cleaning area radius of the screen when a single knocking body knocks on the screen is determined; finally, according to the optimal vibration mode, the mass and shape of the knocking body are selected, and the arrangement of the knocking body is designed according to the screen size and the radius of the effective cleaning area of ​​the knocking body. When arranging the knocking bodies, it should be considered that the effective cleaning areas of adjacent knocking bodies overlap by more than one-third to ensure the cleaning effect; the layout position of each knocking body and the length of the connecting rope are determined according to the requirements of the overlapping cleaning area; the stiffness of the connecting rope is designed according to the determined mass of the knocking body and the length of the connecting rope.

Claims

1. An anti-clogging self-cleaning gravel vibration screening device, comprising a screen box support, a screen box arranged on the screen box support, a vibrating screen motor arranged on the screen box, and a screen arranged in the screen box for vibrating and screening gravel, characterized in that: Also includes: Several knock components; The screen is divided into a number of screening surfaces in sequence along its length direction; a number of the knocking components are arranged in one-to-one correspondence with the number of the screening surfaces, and the knocking components include a number of knocking bodies that are evenly arranged below the screen along the width direction of the screen and have magnetism, a connecting rope and a clamping piece that are evenly radiated with the knocking body as the center; one end of the connecting rope is connected to the knocking body, and the other end of the connecting rope is detachably connected to the screen through the clamping piece.

2. The anti-clogging self-cleaning gravel vibrating screening device according to claim 1, characterized in that: The clamping part is an electromagnetic clamp, which includes an upper clamp fixed to the bottom of the screen with the clamping mouth facing downward, a lower clamp fixed to the screen box bracket with the clamping mouth facing upward and cooperating with the upper clamp, a lifting spring arranged in the lower clamp, a magnetic fixing head accommodated in the clamping groove formed by the lower clamp and the upper clamp, and a guide groove arranged on one side of the lower clamp and misaligned with the upper clamp; electromagnets are arranged inside the upper clamp and the lower clamp; the connecting rope passes through the guide groove and is connected to the fixing head.

3. The anti-clogging self-cleaning gravel vibrating screening device according to claim 2, characterized in that: It also includes a receiving assembly, which includes a lifting member fixed on the screen box bracket and located below the knocking body, a receiving groove arranged on the top of the lifting member for receiving the knocking body, and an electromagnet arranged in the receiving groove.

4. The anti-clogging self-cleaning gravel vibrating screening device according to claim 3, characterized in that: The lifting member is a hydraulic cylinder or a pneumatic cylinder.

5. The anti-clogging self-cleaning gravel vibrating screening device according to claim 1, characterized in that: Along the length direction of the screen, the knocking assemblies at the odd-numbered positions are each provided with n knocking bodies, and the knocking assemblies at the even-numbered positions are each provided with m knocking bodies, wherein n≠m, 2≤n≤5, 2≤m≤5.

6. The anti-clogging self-cleaning gravel vibrating screening device according to claim 1, characterized in that: The knocking body is spherical or truncated cone-shaped, and a polytetrafluoroethylene coating is sprayed on the surface of the knocking body.

7. The anti-clogging self-cleaning gravel vibrating screening device according to claim 1, characterized in that: A filling cavity is provided inside the knocking body, and a filling hole connected to the filling cavity is provided on the outer wall of the knocking body. A detachable sealing cover is covered on the filling hole. The filling cavity is filled with fillers of different weights to adjust the weight of the knocking body.

8. The anti-clogging self-cleaning gravel vibrating screening device according to claim 1, characterized in that: The connecting rope is an elastic rope, and the knocking body is connected to the connecting rope in no less than two directions.

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