Suspended coupled vibration screening machine

Abstract

The present invention discloses a vibrating screen, specifically a suspended coupled vibrating screen, which is characterized in that it includes a fixed beam with disc springs I installed at both ends; a motor frame fixedly installed with a motor with an eccentric block and a disc spring II, and the disc spring II is connected to the disc spring I aligned directly above it through a wire suspension rope; and a screen box having a first suspension rod and a second suspension rod, the first suspension rod is fixedly connected to the disc spring II aligned directly above it, and the second suspension rod is fixedly connected to the disc spring II aligned directly above it; the rotational frequency of the vibrator is equal to the natural frequency of the screen box. The present invention has the characteristics of high use reliability, high screening efficiency, energy saving, etc.

Description

Technical Field

[0001] The present invention discloses a vibrating screen, specifically a suspended coupled vibrating screen. Background Art

[0002] Vibrating screens utilize the principle of mechanical vibration to make materials be thrown up on the screen surface and move linearly forward while being reasonably matched with the screen mesh, thereby achieving the purpose of screening. Therefore, using a vibrating screen to classify large and small particle materials mixed together is a common industrial classification method.

[0003] Working based on the principle of vibration, theoretically, the power consumption is relatively small compared to other forms of material classification, while the production capacity is large. Therefore, vibrating screens are not only widely used in ore dressing screening in mines, but also in other industrial and agricultural production industries to screen materials of various particle sizes, or to perform dehydration, de-sludging, and de-medium of materials, etc.

[0004] The suspended screen is a structural form of a vibrating screen. The structural form of a traditional suspended screen is as Figure 1 shown; its vibrator and the screen box are fixed together as a whole through connecting parts, the motor driving the vibrator is fixedly installed on the ground, and the screen box is fixedly connected to a single set of springs through suspension rods; the screen box is composed of a screen frame and multiple layers of screen meshes; the motor drives the vibrator, the vibrator generates vibration, and the screen box vibrates accordingly to perform material classification. There is also a suspended vibrating screen (publication number: CN103639113A) in a Chinese patent document with a similar structure to this kind of suspended screen; the common disadvantages of these two structural forms are: (1) The vibrator and the screen box are fixedly connected and vibrate together, increasing the vibration load of the screen box, correspondingly increasing the energy consumption, and also shortening the service life of the vibrator; (2) When the motor drives the vibrator, a traction pulling force will be generated, which will cause the screen box and the springs connected to the screen box to be subjected to an additional pulling force, increasing the load of the screen box and the springs. There is also a wide-width suspended vibrating screen (patent number: CN204638514U) in a Chinese patent. Although the screen box of this kind of structure is also in a suspended structure, this kind of vibrating screen is a swing type screening, and there are no springs, which belongs to rigid swing, and the screen box has no vibration in the vertical direction. In view of this, the present invention has developed a suspended coupled vibrating screen. Summary of the Invention

[0005] The purpose of the present invention is to provide a suspended coupled vibrating screen in view of the defects of the prior art.

[0006] In order to achieve the above purpose of the present invention, the technical solutions adopted are:

[0007] A suspended coupled vibrating screen includes,

[0008] A fixed steel beam with springs Ⅰ installed at both ends;

[0009] The support frame is fixedly installed with an exciter, a motor and a spring II. The exciter is in transmission connection with the motor, and the spring II is connected to the spring I aligned directly above it through a wire suspension rope I; and

[0010] The sieve box has a wire suspension rope II and a wire suspension rope III. The wire suspension rope II is fixedly connected to the spring II aligned directly above it, and the wire suspension rope III is fixedly connected to the spring II aligned directly above it. Among them, the rotational frequency of the exciter is equal to the natural frequency of the sieve box. The natural frequency of the sieve box is determined by the spring stiffness supporting the sieve box and the mass of the sieve box.

[0011] The working principle of the present invention: The sieve box is fixedly connected to the spring II installed on the support frame through the wire suspension rope II and the wire suspension rope III respectively. The spring II is fixedly connected to the spring I installed on the fixed steel beam through the wire suspension rope I respectively. An exciter and a motor are also installed on the support frame. The motor is in transmission connection with the exciter through a transmission belt. The motor drives the exciter to vibrate through the transmission belt, so that the exciter drives the support frame to vibrate. Under the vibration of the support frame, the spring I and the spring II produce a linkage and vibration coupling occurs, enabling the screening machine of the present invention to achieve vibration coupling screening.

[0012] As a further improvement of the present invention, the stiffnesses of the spring I and the spring II are different; and at the same time satisfy

[0013] G is a physical constant, D is the outer diameter of the spring, d is the diameter of the spring wire, and n is the number of spring coils;

[0014] Secondary vibration isolation vibration, the stiffnesses of the two groups of springs are respectively determined by the following formulas: K1 = ω1 2 m1, K2 = ω2 2 m2, where the frequency ω = ω2. The ranges of the stiffnesses of the two are determined by the masses of their respective participating vibrating bodies, and are directly proportional to the mass size and inversely proportional to the vibration frequency.

[0015] As a further improvement of the present invention, both the spring I and the spring II include a U-shaped rod, a pressure plate and a spring. A spring is installed between the pressure plates, and the U-shaped rod sequentially passes through the bottom pressure plate, the spring and the top pressure plate and is threadedly fixed to a nut.

[0016] As a further improvement of the present invention, the length of the wire suspension rope II is shorter than that of the wire suspension rope III. After the wire suspension rope II and the wire suspension rope III are fixedly installed respectively, the sieve box is installed in an inclined manner towards the wire suspension rope III.

[0017] As a further improvement of the present invention, the support frame has an inclined support surface and a horizontal support surface. The inclined support surface is vertically and fixedly installed on the horizontal support surface; the exciter and the motor are fixedly installed on the inclined support surface, and springs II are installed at both ends of the horizontal support surface. Installing the exciter on the inclined support surface is conducive to the resultant vibration force generated being perpendicular to the screening surface of the screening box.

[0018] As a further improvement of the present invention, the screening box is provided with a sieve mesh. The sieve mesh vibrates and screens the materials entering the screening box.

[0019] The theoretical basis of the present invention is the secondary vibration isolation vibration coupling principle (the "coupling" mentioned in the present invention refers to the phenomenon that two or more systems or two forms of motion affect each other and even combine through mutual interaction). The difference between the present invention and the existing screening machines is that no exciter is installed on the screening box; instead, the exciter and the motor are installed on the support frame; a spring I is installed at the top of the fixed beam, and a spring II is installed on the support frame below the fixed beam. The spring II and the spring I are connected in a one-to-one correspondence in the vertical direction; the motor drives the exciter, and the exciter forces the support frame to vibrate. Then, the support frame forces the spring II and the spring I to produce a linkage. According to the secondary vibration isolation vibration coupling theory, the rotational frequency of the exciter is equal to the natural frequency of the screening box, generating vibration coupling. The exciter and the support frame remain stationary, and the vibration force of the exciter is transmitted to the screening box through vibration coupling, so that the screening box realizes vibration coupling screening.

[0020] The present invention has outstanding substantive features and remarkable progress compared with the prior art:

[0021] 1. The vibration separation screening machine of the present invention is improved and created on the basis of the existing vibrating screen. In the vibrating screen of the present invention, the exciter is separated from the screening box, and the exciter and the motor are installed on the support frame together, reducing the load on the screening box. The screening box is indirectly connected to the exciter through the steel wire suspension rope III, the steel wire suspension rope II, the support frame, the spring II and the spring I; the exciter is used to excite the motor frame, so that the support frame drives the spring II, the spring I and the screening box to vibrate; during the vibration process, the spring I and the spring II are linked to generate vibration coupling; according to the secondary vibration isolation vibration coupling theory, when the vibration force frequency is equal to the natural frequency of the screening box, the exciter remains stationary. The vibration force of the exciter is transmitted to the screening box through vibration coupling, and then the screening box realizes the vibration screening work, while the support frame and the exciter itself remain stationary; eliminating the influence of vibration on the outside world, achieving the purpose of safety, high efficiency and energy saving. It reduces power consumption by more than 30% compared with the current vibrating screen.

[0022] 2. The present invention overcomes the disadvantages of the traditional vibrating screen, such as high manufacturing and assembly requirements for each component, easy damage of elastic elements, and the amplitude of the screening machine changing with the feeding amount, resulting in unstable operation. It has small power consumption and high production efficiency.

[0023] 3. The present invention is applicable to the classification of mixed materials of large and small particles in various industries, and is also used for material dehydration, de-sludging, and de-medium separation, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 is a schematic structural view of a traditional bench-type screening machine;

[0026] Figure 2 is a front structural view of a suspension-type coupled vibration screening machine of the present invention;

[0027] Figure 3 is a schematic view of the vibration principle of a common vibrating screen;

[0028] Figure 4 is a schematic view of the mechanical model of a coupled vibration screening machine, in which the exciter is separated from the screen box in a traditional vibrating screen;

[0029] The names and serial numbers of each component in the figure: Spring I 1, U-shaped rod 101, pressure plate 102, spring 103, steel wire suspension rope I 2, exciter 3, transmission belt 4, motor 5, spring II 6, support frame 7, steel wire suspension rope II 8, screen box 9, screen mesh 10, fixed steel beam 11, steel wire suspension rope III 12. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0031] Figure 2 Shown is the suspension-type coupled vibration screening machine of the present invention. As Figure 2 can be seen, the exciter 3 used in the present invention is separated from the screen box 9, so as to reduce the load of the screen box 9, improve the working efficiency of the screen box, and extend the service life of the equipment.

[0032] As Figure 2 and 3As shown in the figure, a suspension-coupled vibrating screen includes a fixed steel beam 11, a support frame 7, and a sieve box 9. Springs I 1 are installed at both ends of the fixed steel beam 11. The support frame 7 is fixedly installed with an exciter 3, a motor 5, and springs II 6. The exciter 3 is drivingly connected to the motor 5. The spring II 6 and the spring I 1 aligned directly above it are connected by a steel wire suspension rope I 2. The sieve box 9 has a steel wire suspension rope II 8 and a steel wire suspension rope III 12. The steel wire suspension rope II 8 is fixedly connected to the spring II 6 aligned directly above it, and the steel wire suspension rope III 12 is fixedly connected to the spring II 6 aligned directly above it. The rotational frequency of the exciter 3 is equal to the natural frequency of the sieve box 9.

[0033] The natural frequency of the sieve box 9 is determined by the spring stiffness supporting the sieve box and the mass of the sieve box (see the coupling working principle below).

[0034] The stiffnesses of the spring I 1 and the spring II 6 are different; and at the same time satisfy

[0035] The stiffness of the spring is calculated by the formula: G is a physical constant, D is the outer diameter of the spring, d is the diameter of the spring wire, and n is the number of spring coils;

[0036] For secondary vibration isolation vibration, the spring stiffnesses of the two groups are determined by the following formulas: K1 = ω1 2 m1, K2 = ω2 2 m2, where the frequency ω = ω2. The ranges of the stiffnesses of the two are determined by the masses of their respective participating vibrating bodies, and are directly proportional to the mass size and inversely proportional to the vibration frequency.. And the masses m1 and m2 of the individual vibrating bodies are different, so the stiffnesses are also different.

[0037] Both the spring I 1 and the spring II 6 include a U-shaped rod 101, a pressure plate 102, and a spring 103. The spring 103 is installed between the pressure plates 102. The U-shaped rod 101 sequentially passes through the bottom pressure plate 102, the spring 103, and the top pressure plate 102 and is threadedly fixed to the nut. The U-shaped rod 101 can play a guiding and limiting role.

[0038] The length of the steel wire suspension rope II 8 is shorter than that of the steel wire suspension rope III 12. After the steel wire suspension rope II 8 and the steel wire suspension rope III 12 are fixedly installed respectively, the sieve box 9 is installed in an inclined manner towards the steel wire suspension rope III 12.

[0039] The support frame 7 has an inclined support surface and a horizontal support surface. The inclined support surface is vertically fixedly installed on the horizontal support surface; the exciter 3 and the motor 5 are fixedly installed on the inclined support surface, and the springs II 4 are installed at both ends of the horizontal support surface.

[0040] The sieve box 9 is provided with a sieve mesh 10. The sieve mesh 10 vibrates and screens the materials entering the sieve box 7.

[0041] Spring I 1 and Spring II 6 are coaxially connected by wire sling I 2; wire sling II 8 and wire sling III 12 are respectively coaxially connected to Spring II 6 to which they are respectively connected.

[0042] Spring I 1 and Spring II 6 are coaxially connected by wire sling I 2. The wire rope is flexible. During the vibration process, it can reduce the tensile impact on Spring I 1, protect Spring I 1, delay the damage during work, and improve the service life.

[0043] The specific working mode of the present invention is as follows:

[0044] The sieve box 9 of the present invention is fixedly connected to Spring II 6 installed on the support frame 7 through wire sling II 8 and wire sling III 12 respectively. Spring II 6 is fixedly connected to Spring I 1 installed on the fixed steel beam 11 through wire sling I 2. An exciter 3 and a motor 5 are also installed on the support frame 7. The motor 5 is drivingly connected to the exciter 3 through a transmission belt 4. The motor 5 drives the exciter 3 to vibrate through the transmission belt 4, so that the exciter 3 drives the support frame 7 to vibrate. Under the vibration of the support frame 7, Spring I 1 and Spring II 6 produce a linkage; according to the theory of secondary vibration isolation vibration coupling, when the rotational frequency of the exciter 3 is equal to the natural frequency of the sieve box 7, vibration coupling occurs, and the support frame 7, the exciter 3 and the motor 5 are stationary. The exciter 3 transmits the vibration force to the sieve box 9 through vibration coupling for vibration screening work. Therefore, the energy loss can be effectively reduced, and the power consumption can be reduced by more than 30% compared with the traditional screening machine.

[0045] The sieve box 9 of the present invention is not equipped with an exciter 3, which reduces the load on the sieve box 9, and further reduces the vibration load of the sieve box 9, and can extend the service life of the equipment.

[0046] Coupling working principle:

[0047] I. Vibration principle of ordinary vibrating screen Figure 3 As shown, the sieve box vibrates under the action of the exciter on the sieve box to realize the screening of materials. According to the basic law of dynamics, the vibration differential equation of the sieve box is:

[0048] X horizontal direction

[0049]

[0050] Y vertical direction

[0051]

[0052] In the above formula: M - the mass of the sieve box and the material participating in the vibration;

[0053] m - the mass of the eccentric block;

[0054] c - viscous damping coefficient;

[0055] Kx and Ky are the spring stiffnesses in the x and y directions respectively;

[0056] F --- eccentric excitation force;

[0057] The meanings of the above symbols are shown in Figure 3 indicated;

[0058] Second, for the coupled vibration screening machine, the exciter is separated from the screen box in the traditional vibrating screen. Its mechanical model is shown in Figure 4 as follows, which is a forced vibration system with two degrees of freedom with viscous damping. The forced vibration equation of this system has the following form:

[0059]

[0060] In the formula:

[0061] M 11 = m1, M 22 = m2, C 11 = c1 + c2, C 12 = C 21 = -c2,

[0062] C 22 = c2, K 11 = k1 + k2, K 12 = K 21 = -k2, K 22 = k2

[0063] m1 - the mass of the screen box and the material participating in the vibration;

[0064] m2 - the mass of the exciter and the frame;

[0065] c1, c2 --- vibration viscous damping coefficients;

[0066] k1, k2 - the spring stiffnesses of spring I and spring II respectively;

[0067] F1 --- the eccentric excitation force of the exciter;

[0068] Specifically, see Figure 4 indicated;

[0069] The general solution of the forced vibration equation can be expressed as

[0070]

[0071]

[0072] For damped vibration, due to and the existence of, after a certain period of time, it will all disappear, and only forced vibration will exist. Therefore, the steady-state solution of the forced vibration equation:

[0073] x1 = B 1c cosωt + B 1s sinωt

[0074] x2 = B 2c cosωt + B 2s sinωt

[0075] Substitute the displacements x1, x2 and their first and second derivatives into Equation (1), and after simplification and rearrangement, we get:

[0076] [(K 11 - M 11 ω 2 )B 1c + K 12 B 2c + C 11 ωB 1s + C 12 ωB 2s cosωt

[0077] + [(K 11 - M 11 ω 2 )B 1s + K 12 B 2s - C 11 ωB 1c - C 12 ωB 2c - F1]sinωt = 0

[0078] [(K 22 - M 22 ω 2 )B 2c + K 12 B 1c + C 12 ωB 1s + C 22 ωB 2s cosωt

[0079] [(K 22 - M 22 ω 2 )B 2s + K 12 B 1s + C 12 ωB 1c + C 22 ωB 2c sinω = 0

[0080] To make the above equation identically equal, the coefficients of sinωt and cosωt must be zero, that is

[0081] (K 11 -M 11 ω 2 )B 1c +K 12 B 2c -C 11 ωB 1s -C 12 ω 2s =0

[0082] (K 11 -M 11 ω 2 )B 1s +K 12 B 2s -C 11 ωB 1c -C 12 ω 2c =F1

[0083] (K 22 -M 22 ω 2 )B 2c +K 12 B 1c -C 12 ωB 1s -C 22 ω 2s =0

[0084] (K 22 -M 22 ω 2 )B 2s +K 12 B 1s -C 12 ωB 1c -C 22 ω 2c =0

[0085] Based on the above four algebraic equations, the four unknowns B 1c 、B 2c 、B 1s and B 2s can be obtained. At this time, the displacement can be expressed as

[0086]

[0087]

[0088] where

[0089]

[0090]

[0091] In a vibrating screen, since the damping force is relatively small, it is considered that c1 = c2 ≈ 0.

[0092]

[0093]

[0094] Let (This can be achieved in engineering), then there is

[0095] B1 = 0

[0096]

[0097] That is to say, when the excitation frequency ω is equal to the natural vibration frequency of the screen box M1 the amplitude of the exciter frame M2 is zero and it remains stationary. Here, borrowing a concept in physics "coupling", this phenomenon is called "vibration coupling". It refers to the phenomenon that two or more vibrating bodies affect each other through interaction.

[0098] According to the above principle, the vibrating separation and screening machine of the present invention realizes the separation of vibration and movement, that is, the exciter only generates vibration force and itself does not move, and the screen box will vibrate only when vibration operation is required. The parts that should move move, and the parts that should not move do not move, without doing useless work, so as to achieve the purpose of energy saving.

[0099] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or alterations derived therefrom are still within the protection scope of the present invention.

Claims

1. A suspension type coupled vibration screening machine, characterized in that: Including, A fixed steel beam (11) with springs I (1) installed at both ends; A support frame (7) fixedly installed with an exciter (3), a motor (5) and a spring II (6), the exciter (3) is drivingly connected to the motor (5), and the spring II (6) is connected to the spring I (1) aligned directly above it through a steel wire sling I (2); and A sieve box (9) having a steel wire sling II (8) and a steel wire sling III (12), the steel wire sling II (8) is fixedly connected to the spring II (6) aligned directly above it, and the steel wire sling III (12) is fixedly connected to the spring II (6) aligned directly above it; Wherein, the rotational frequency of the exciter (3) is equal to the natural frequency of the sieve box (9); The support frame (7) has an inclined support surface and a horizontal support surface, the inclined support surface is vertically fixedly installed on the horizontal support surface; the inclined support surface fixedly installs the exciter (3) and the motor (5), and springs II (4) are installed at both ends of the horizontal support surface; The length of the steel wire sling II (8) is shorter than that of the steel wire sling III (12). After the steel wire sling II (8) and the steel wire sling III (12) are fixedly installed respectively, the sieve box (9) is installed in an inclined manner towards the steel wire sling III (12).

2. The suspended coupled vibration screening machine according to claim 1, wherein: The springs I (1) and springs II (6) both include U-shaped rods (101), pressure plates (102) and springs (103). Springs (103) are installed between the pressure plates (102), and the U-shaped rods (101) sequentially penetrate through the bottom pressure plate (102), the spring (103) and the top pressure plate (102) and are fixedly connected to the nut by threads.

3. The suspension type coupled vibration screening machine according to claim 1, characterized in that: The sieve box (9) is provided with a sieve mesh (10).

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