Vibrating screen device

Abstract

In a vibrating screen device, the misalignment of the biasing member relative to the bolt is suppressed. [Solution] A vibrating screen device that applies mechanical vibration to a material to be screened on a screen to separate the material is comprising: an upper frame that supports the screen and has a first flange 16 at its lower end; a lower frame 2 having a second flange 17 fastened and fixed to the first flange 16 of the upper frame via bolts 40 and nuts 42; a coil spring 41 (biasing member) provided between the second flange 17 and the head 40a of the bolt 40, which biases the bolt 40 in a direction opposite to that of the nut 42; and a protrusion 50a (positioning part) of a washer-shaped member 50 that prevents the coil spring 41 from shifting relative to the bolt 40.

Description

Technical Field

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[0001] The present invention relates to a vibrating screen device that imparts mechanical vibration to a material to be screened supplied onto a screen having through holes to screen the material to be screened.

Background Art

[0002] For example, as disclosed in Patent Document , there is known a screening machine (vibrating screen device) that places a material to be screened on a screen surface and imparts mechanical vibration to the entire device to screen the material to be screened. In this screening machine, an upper frame configured to have a screen surface fastened to a beam is provided on a support base of a lower frame with an inclined upper portion, and the base of the beam inside the upper frame is joined to the support base by bolts and nuts with springs interposed therebetween.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] To achieve the above objective, the first invention, This invention relates to a vibrating screen device that applies mechanical vibration to the material to be screened on a screen to separate the material. The vibrating screen device, A first frame supporting the screen, A second frame is fastened and fixed to the first frame via bolts and nuts, A biasing member provided between the first frame or the second frame and the head of the bolt or the nut, which biases the bolt in a direction opposite to that of the nut, The system includes a positioning unit that prevents the biasing member from shifting position relative to the bolt.

[0007] According to the above configuration, the biasing member biases the bolt in a direction opposite to that of the nut, thereby suppressing the loosening of the nut even when vibration occurs. Furthermore, the positioning part prevents the biasing member from shifting position relative to the bolt.

[0008] In the second invention, in the first invention, The biasing member is a coil spring, The head of the bolt or a washer-shaped member located between the nut and the coil spring is provided. The positioning portion is provided on the washer-shaped member.

[0009] According to the above configuration, by devising the shape of the washer-like member, displacement of the coil spring relative to the bolt is suppressed.

[0010] In the third invention, in the first invention, The biasing member is a coil spring, The positioning portion is a recess or protrusion that can contact the inner or outer circumference of the coil spring.

[0011] According to the above configuration, the recess or protrusion contacts the inner or outer circumference of the coil spring, thereby preventing the coil spring from shifting relative to the bolt.

[0012] In the fourth invention, in the first invention, The biasing member is a coil spring, The positioning portion is a tapered recess whose depth gradually increases toward the center of the bolt.

[0013] According to the above configuration, the alignment function of the tapered recess prevents the coil spring from shifting relative to the bolt.

[0014] In the fifth invention, in the first invention, The biasing member is a coil spring, The positioning portion is a cylindrical member that is fixed to the first frame or the second frame and covers the outer circumference of the coil spring.

[0015] According to the above configuration, the cylindrical member fixed to the first or second frame prevents the coil spring from shifting relative to the bolt.

[0016] In the sixth invention, in any one of the second to fifth inventions, The difference between the inner circumference of the coil spring and the maximum diameter of the bolt is 10 mm or more and 30 mm or less, preferably 15 mm or more and 25 mm or less.

[0017] If the difference between the inner circumference of the coil spring and the maximum diameter of the bolt is less than 10 mm, the difference is too small, and the coil spring may become difficult to operate due to the accumulation of powder or the like, and the effect of preventing the nut from loosening may not be appropriately exhibited. If the difference between the inner circumference of the coil spring and the maximum diameter of the bolt is greater than 30 mm, the outer circumference of the coil spring is greatly separated from the axis of the bolt fixing the coil spring, so the possibility of the coil spring being twisted increases. However, according to the above configuration, since it is set to an appropriate gap size, the effect of preventing the nut from loosening by the coil spring is appropriately exhibited while suppressing clogging of particles such as sintered ore and lime.

[0018] In the seventh invention, in the first invention, The biasing member is a leaf spring having a U-shaped cross section, and has a pair of bolt insertion holes that face each other and through which the bolt is inserted. The positioning portion is formed by the bolt insertion holes of the leaf spring.

[0019] According to the above configuration, the bolt insertion holes of the leaf spring suppress the displacement of the leaf spring with respect to the bolt.

Effect of the Invention

[0020] As described above, according to the present invention, it is possible to suppress the displacement of the biasing member such as a spring or a leaf spring with respect to the bolt, and it is possible to minimize the work of checking the loosening of the nut due to operation.

Brief Description of the Drawings

[0021] [Figure 1] It is a perspective view of the vibrating screen device according to an embodiment of the present invention as viewed from the upper right. [Figure 2] It is a right side view showing the vibrating screen device. [Figure 3] It is an enlarged cross-sectional view showing the first flange, the second flange, the bolt, the nut, the coil spring, and the periphery thereof. [Figure 4] It is a view corresponding to FIG. 3 according to Modification 1. [Figure 5] This is a figure equivalent to Figure 3, relating to Modification 2. [Figure 6] This is a figure equivalent to Figure 3 relating to Modification 3. [Figure 7] Modification 4 is shown, where (a) is a plan view, (b) is a cross-sectional view, and (c) is a bottom view. [Figure 8] Modification 5 is shown, where (a) is a plan view, (b) is a cross-sectional view, and (c) is a bottom view. [Modes for carrying out the invention]

[0022] Embodiments of the present invention will be described below with reference to the drawings.

[0023] Figures 1 and 2 show a vibrating screen device 1 according to an embodiment of the present invention, which applies mechanical vibration to the material to be screened, which is supplied to the hopper-shaped supply section 11 on the upstream side as it falls, thereby separating the material to be screened.

[0024] The vibrating screen device 1 includes an upper frame 3 as a first frame that supports the screen 20 and has a first flange 16 at its lower end.

[0025] The upper frame 3 has a pair of left and right side plates 10 that restrict the sieved material from spilling out from the left and right. For example, an elongated plate member 12 is provided at the upper end of the side plates 10. A reinforcing plate 13 is attached to the downstream end in the direction of discharge for reinforcement.

[0026] Multiple plate-shaped screens 20, each having multiple through-holes 20a, are detachably fastened to support brackets (not shown) provided on the upper frame 3. The shape of the through-holes 20a is not particularly limited, but as shown in Figure 1, elongated ones may be arranged at equal intervals.

[0027] Although not shown in detail, the screen 20 is fastened to a support bracket provided on the upper frame 3, while being held in place from above by a bolt head or nut via, for example, a rectangular retaining plate 21. This bolt head or nut is protected by a protective member 22.

[0028] As shown in Figure 1, it is desirable that the upper surface of the screen 20 is inclined downward in the direction of transport so that the material to be sieved can be easily transported.

[0029] As shown in Figure 3, the vibrating screen device 1 includes a lower frame 2 as a second frame having a second flange 17 that is fastened and fixed to the first flange 16 of the upper frame 3 via bolts 40 and nuts 42.

[0030] The lower frame 2 is equipped with, for example, a total of four support brackets 2a protruding from the left and right sides. Four base portions 4 are fixed to the mounting surface of the vibrating screen device 1 by bolts or the like (not shown). Each support bracket 2a is vibrably supported by its respective base portion 4 via support coil springs 5. Three support coil springs 5 ​​are provided for one upstream support bracket 2a and two for one downstream support bracket 2a, but the number and size of the springs are not particularly limited.

[0031] A vibration device 6 is provided below the supply unit 11 in the lower frame 2, and the lower frame 2 is forcibly vibrated by the rotation of an eccentric cam 6a, which is rotationally driven by an electric motor (not shown) or the like. The material to be sieved is not particularly limited, but for example, it is a sintered ore or something that is relatively hot and has a large mass.

[0032] In this embodiment, a pit (not shown) is dug below the lower frame 2, into which the sieved material falls and is stored. Alternatively, the sieved material may be transported by a conveyor belt or the like.

[0033] As shown in an enlarged view in Figure 3, the vibrating screen device 1 is provided between the second flange 17 and the head 40a of the bolt 40, and includes a coil spring 41 for preventing loosening, which acts as a biasing member that biases the bolt 40 in a direction opposite to that of the nut 42.

[0034] The vibrating screen device 1 is equipped with a positioning unit that prevents the anti-loosening coil spring 41 from shifting relative to the bolt 40.

[0035] In this embodiment, a washer-shaped member 50 is provided between the bolt head 40a and the anti-loosening coil spring 41, and the positioning portion is a convex portion 50a provided on the washer-shaped member 50 that can abut against the inner circumference of the anti-loosening coil spring 41.

[0036] The difference between the inner circumference of the anti-loosening coil spring 41 and the maximum diameter of the bolt 40 is 10 mm or more and 30 mm or less, preferably 15 mm or more and 25 mm or less.

[0037] As shown in Figure 3, a washer-shaped member 50 is inserted through the head 40a side of the bolt 40, and a coil spring 41 for preventing loosening is passed through it. The bolt 40 is then inserted from below through the first bolt insertion hole 16a of the first flange 16 and the second bolt insertion hole 17a of the second flange 17, and a flat washer 43 is inserted before fastening the nut 42. In Figure 3, the inner diameter of the first bolt insertion hole 16a on the flat washer 43 side is larger than the inner diameter of the second bolt insertion hole 17a of the second flange 17. The difference between the inner diameter of the first bolt insertion hole 16a and the inner diameter of the second bolt insertion hole 17a is 1 mm or more and 5 mm or less, preferably 3 mm. In this way, even if the centers of the first bolt insertion hole 16a and the second bolt insertion hole 17a are slightly misaligned, it becomes possible to insert the bolt 40 into both the first bolt insertion hole 16a and the second bolt insertion hole 17a.

[0038] In this embodiment, the protrusion 50a of the washer-shaped member 50 is positioned to abut against the inner circumference of the anti-loosening coil spring 41. Alternatively, although not shown in the figures, the inner diameter of the protrusion 50a of the washer-shaped member 50 may be increased to position the protrusion 50a on the outer circumference side, so that the protrusion 50a abuts against the outer circumference of the anti-loosening coil spring 41.

[0039] Furthermore, if a coil spring 41 for preventing loosening is placed on the nut 42 side, a washer-shaped member 50 can be provided between the nut 42 and the coil spring 41 for preventing loosening.

[0040] Next, the procedure for sieving the material to be screened using the vibrating screen device 1 will be explained.

[0041] First, for example, sieved material such as sintered ore, which is at a relatively high temperature, is supplied to the supply unit 11 by falling through a conveyor belt.

[0042] The sieved material rolls along the screen 20, and anything smaller than the through-hole 20a falls into the pit below.

[0043] In this case, the anti-loosening coil spring 41 biases the bolt 40 in a direction opposite to that of the nut 42, thereby suppressing the loosening of the nut 42 even when vibration occurs.

[0044] Furthermore, in this embodiment, the protrusion 50a of the washer-shaped member 50 abuts against the inner circumference of the anti-loosening coil spring 41, thereby suppressing misalignment of the anti-loosening coil spring 41 relative to the bolt 40.

[0045] Furthermore, if the difference between the inner circumference of the anti-loosening coil spring 41 and the maximum diameter of the bolt 40 is less than 10 mm, the difference is too small, and the accumulation of powdery material may make it difficult for the anti-loosening coil spring 41 to operate, preventing the nut 42 from loosening properly. Also, if the difference between the inner circumference of the anti-loosening coil spring 41 and the maximum diameter of the bolt 40 is greater than 30 mm, the axis of the bolt 40 that secures the coil spring 41 and the outer circumference of the coil spring 41 will be far apart, increasing the likelihood of the coil spring 41 twisting. However, in this embodiment, the gap is set to an appropriate size, so the anti-loosening effect of the anti-loosening coil spring 41 on the nut 42 is properly exerted while suppressing clogging of particles such as sintered ore and lime.

[0046] As described above, according to this embodiment, misalignment of the anti-loosening coil spring 41 relative to the bolt 40 can be suppressed, and the work of checking for loosening of the nut 42 due to operation can be minimized.

[0047] -Experimental Variation 1- Figure 4 shows a modified example 1 of the present invention, which differs from the above embodiment in that the shape of the positioning portion is different. In the following modified examples, the same reference numerals are used for parts that are the same as those in Figures 1 to 3, and their detailed descriptions are omitted.

[0048] In this modified example, a positioning recess 17b is recessed around the second bolt insertion hole 17a in the second flange 17, into which the upper end of the anti-loosening coil spring 41 fits. This positioning recess 17b can be formed, for example, by cutting a circular groove on the outer circumference when machining the second bolt insertion hole 17a. If the upper end shape of the anti-loosening coil spring 41 is a cross-sectional shape other than a circular cross-section, the positioning recess 17b should be cut to match that cross-sectional shape.

[0049] In this way, by forming a positioning recess 17b on the second flange 17 side, the positioning recess 17b abuts against the inner and outer circumferences of the anti-loosening coil spring 41, effectively suppressing misalignment of the anti-loosening coil spring 41 relative to the bolt 40. Alternatively, instead of providing a protrusion 50a on the washer-shaped member 50, a positioning recess may be provided, or if the anti-loosening coil spring 41 is provided on the first flange 16 side, a positioning recess may be provided on the first flange 16.

[0050] Furthermore, as shown in the modified examples 1 to 3 in Figures 4 to 6, a higher level of positional displacement prevention can be obtained by using the positioning recess 17b and other positioning parts in combination with the washer-shaped member 50.

[0051] -Variation 2- Figure 5 shows a modified example 2 of the present invention, which differs from the above embodiment in that the shape of the positioning portion is different.

[0052] In this modified example, the positioning portion is a positioning projection 17c provided on the second flange 17 that can contact the outer circumference of the anti-loosening coil spring 41.

[0053] The positioning protrusions 17c may be provided continuously around the entire circumference, or they may be provided at intervals in the circumferential direction. For example, the positioning protrusions 17c can be provided by welding, for example, a ring-shaped component to the outer circumference of the second bolt insertion hole 17a. The vertical height of the positioning protrusions 17c is preferably greater than the wire diameter of the anti-loosening coil spring 41.

[0054] In this way, by forming a positioning projection 17c on the second flange 17 side, the positioning projection 17c abuts against the outer circumference of the anti-loosening coil spring 41, thereby suppressing misalignment of the anti-loosening coil spring 41 relative to the bolt 40. The positioning projection 17c may also be provided so as to be able to abut against the inner circumference of the anti-loosening coil spring 41. Furthermore, if the anti-loosening coil spring 41 is provided on the first flange 16 side, the positioning projection may be provided on the first flange 16.

[0055] -Variation 3- Figure 6 shows a third modified embodiment of the present invention, which differs from the above embodiment in that the shape of the positioning portion is different.

[0056] The positioning portion in this modified example is a tapered recess 17d provided on the second flange 17, whose depth gradually increases toward the center of the bolt 40 (second bolt insertion hole 17a). For example, this recess 17d can be formed by cutting the second flange 17 when forming the second bolt insertion hole 17a, such that its inner diameter gradually widens toward the bottom.

[0057] Here, the alignment function of the tapered recess 17d provided in the second flange 17 effectively suppresses misalignment of the anti-loosening coil spring 41 relative to the bolt 40. Alternatively, instead of providing a protrusion 50a on the washer member 50, a tapered recess may be provided, or if the anti-loosening coil spring 41 is provided on the first flange 16 side, a tapered recess may be provided on the first flange 16.

[0058] -Variation 4- Figure 7 shows a modified example 4 of the present invention, which differs from the above embodiment in that the shape of the positioning portion is different.

[0059] In this modified example, the positioning portion is a cylindrical member 51 fixed to the second flange 17 and covering the outer circumference of the anti-loosening coil spring 41. The inner diameter of the cylindrical member 51 is preferably slightly larger than the outer diameter of the anti-loosening coil spring 41, and its height in the vertical direction is preferably sufficient to cover at least the entire length of the anti-loosening coil spring 41. The cylindrical member 51 may be configured to be attachable to the second flange 17 by screws 52 or the like.

[0060] In this configuration, the anti-loosening coil spring 41, covered by the cylindrical member 51 provided on the second flange 17, is effectively prevented from shifting relative to the bolt 40. Note that if the anti-loosening coil spring 41 is provided on the first flange 16 side, the cylindrical member may be provided on the first flange 16. Furthermore, the cylindrical member is not limited to a cylindrical shape; other cylindrical shapes are also acceptable.

[0061] -Variation 5- Figure 8 shows a modified example 5 of the present invention, which differs from the above embodiment in that the shape of the positioning portion is different.

[0062] Here, the biasing member is a leaf spring 53 with a U-shaped cross-section, and has a pair of bolt insertion holes 53a that face each other and through which a bolt 40 is inserted. The upper end of the leaf spring 53 abuts against the lower surface of the second flange 17, and the lower end of the leaf spring 53 abuts against the head of the bolt 40, thereby biasing the bolt 40 in a direction opposite to that of the nut. The positioning part consists of the bolt insertion holes 53a of the leaf spring 53. The bolt insertion holes 53a can be machined at predetermined positions on the leaf spring 53 so that their inner diameter is slightly larger than the maximum diameter of the bolt 40.

[0063] Here, the anti-loosening effect of the nut 42 can be appropriately achieved by a simple configuration in which the bolt 40 is inserted through the bolt insertion hole 53a of the leaf spring 53, which is less prone to problems such as lateral displacement compared to the coil spring 41 which is susceptible to buckling loads. If the head 40a of the bolt 40 is located on the first frame 16 side, the leaf spring 53 may be provided on the first frame 16 side.

[0064] In the above embodiment, a case was described in which the first frame and the second frame are fixed by inserting bolts through bolt holes formed in the first flange of the first frame and bolt holes formed in the second flange of the second frame. However, the present invention is not limited to this embodiment. The present invention can also be applied when bolt holes are formed in parts of the frame other than the flanges.

[0065] Furthermore, various modifications can be made to the above embodiments without departing from the spirit of the present invention.

[0066] The embodiments described above are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or uses. [Explanation of Symbols]

[0067] 1. Vibrating screen device 2 Lower frame 2a Supported bracket 3. Upper frame 4. Base section 5 Coil springs 6 Vibration device 6a Eccentric cam 10 Side panels 11 Supply section 12 Plate members 13 Reinforcement plate 16. First Flange 16a First bolt insertion hole 17. Second flange 17a Second bolt insertion hole 17b Positioning recess 17c Positioning protrusion 20 screens 20a through hole 21 Retaining plate 22 Protective member 40 volts 40a head 41. Coil spring for preventing loosening 42 nuts 43 Flat Washer 50 Washer-shaped member 50a protrusion 51 Cylindrical member 52 screws 53 Leaf spring 53a Bolt insertion hole

Claims

1. A vibrating screen device that applies mechanical vibration to the material to be sieved on a screen to separate the material to be sieved, A first frame supporting the screen, A second frame is fastened and fixed to the first frame via bolts and nuts, A biasing member provided between the first frame or the second frame and the head of the bolt or the nut, which biases the bolt in a direction opposite to that of the nut, The biasing member is equipped with a positioning part that suppresses misalignment of the bolt. A vibrating screen device characterized by the following features.

2. The biasing member is a coil spring, It includes a washer-shaped member located between the head of the bolt or the nut and the coil spring, The positioning portion is provided on the washer-shaped member The vibrating screen device according to feature 1.

3. The biasing member is a coil spring, The positioning portion is a recess or protrusion that can contact the inner or outer circumference of the coil spring. The vibrating screen device according to feature 1.

4. The biasing member is a coil spring, The positioning portion is a tapered recess whose depth gradually increases toward the center of the bolt. The vibrating screen device according to feature 1.

5. The biasing member is a coil spring, The positioning portion is a cylindrical member fixed to the first frame or the second frame and covering the outer circumference of the coil spring. The vibrating screen device according to feature 1.

6. The difference between the inner circumference of the coil spring and the maximum diameter of the bolt is 10 mm or more and 30 mm or less, preferably 15 mm or more and 25 mm or less. The vibrating screen device according to any one of claims 2 to 5.

7. The biasing member is a leaf spring with a U-shaped cross-section, and has a pair of bolt insertion holes that face each other and through which the bolt is inserted. The positioning portion consists of the bolt insertion hole of the leaf spring. The vibrating screen device according to feature 1.

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