Variable aperture screen surface

Abstract

The present application relates to the technical field of vibrating screen mesh, and discloses a variable aperture screen surface, which comprises two horizontal frames, groove frames connected to the two ends of the two horizontal frames, a plurality of screen rods between the two horizontal frames, and the top angles of every two adjacent screen rods being opposite to each other, the screen rods with the top angles upward and the bottom edges upward being alternately arranged between the two horizontal frames; a plurality of supports are fixedly installed in the groove frames, the supports are internally provided with a rectangular groove body, a triangular groove body communicated with the rectangular groove body, and a vertical groove body communicated with the triangular groove body, and an elastic column is fixedly installed in the rectangular groove body; the variable aperture screen surface utilizes the screen rods with opposite installation directions to screen materials, and the relative movement between the screen rods is realized by compressing the elastic column, so that the size of the aperture can be changed, which is beneficial to the discharge of the clogged materials; compared with the exciting ball, the screening efficiency of the variable aperture screen surface is high, and the variable aperture screen surface will not cause damage to the screen surface; meanwhile, under the action of the elastic sealing film, the screening of the materials on the screen rods can be effectively ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibrating screen mesh, in particular to a variable aperture screen surface. BACKGROUND

[0002] The vibrating screen is a vibrating machine working by using the vibration principle, which is widely used in metallurgy, mining, chemical industry, building materials, water and electricity, coal and other industries. The vibrating screen works by using the reciprocating rotational vibration generated by the vibrator excitation. The vibration trajectory is a complex spatial curve. The curve is a circle in the horizontal plane projection, and an ellipse in the vertical plane projection. Adjusting the excitation force of the upper and lower rotating weights can change the amplitude, and adjusting the spatial phase angle of the upper and lower weights can change the curve shape of the screen surface movement trajectory and the movement trajectory of the material on the screen surface.

[0003] In the working process of the vibrating screen, the hole blocking condition often occurs. The main reasons for hole blocking include: particles close to the size of the screen hole, which can easily cause the screen hole to be blocked when passing through the screen hole; some slightly smaller particles are prone to mutual adhesion, and when the amount of adhered particles reaches a certain value, large particle groups are easily formed to cause screen hole blocking, and some small particles with more moisture can form a covering film under the action of hydration film bridging force, causing screen hole blocking. The change of screen hole diameter can effectively avoid the occurrence of hole blocking phenomenon. Then, in engineering applications, the method of adding excitation balls is often used to change the size of the aperture by using the force of the excitation ball on the screen surface to force the size of the aperture to change, so as to facilitate the breaking of the hole blocking phenomenon. However, in actual application process, the force generated by the additional excitation ball has certain randomness, which will lead to low efficiency of breaking the hole blocking, and the position of the screen surface excited by the excitation ball is easy to be damaged. At the same time, for most rigid screen surfaces, the effect of breaking the hole blocking is not obvious. Therefore, we propose a variable aperture screen surface. SUMMARY

[0004] The purpose of the present application is to provide a variable aperture screen surface to solve the problems raised in the background art.

[0005] In order to achieve the above object, the present application provides the following technical scheme: A variable aperture screen surface, comprising two cross frames, groove frames connected to both ends of the two cross frames, a plurality of screen rods between the two cross frames, the screen rods are parallel to the cross frames and connected to the groove frames; the screen rod is an isosceles triangular prism, the top angles between every two adjacent screen rods are opposite, the screen rods with upward top angles and upward bottom edges are alternately arranged between the two cross frames; a plurality of supports are fixedly installed inside the groove frame, and the supports correspond to the screen rods one by one, a rectangular groove, a triangular groove communicated with the rectangular groove and a vertical groove communicated with the triangular groove are arranged inside the support, both ends of the screen rod are located inside the triangular groove and are limited to slide therein, an elastic column is fixedly installed inside the rectangular groove, the elastic column is in contact with the bottom edge of the screen rod, so that the screen rod compresses the elastic column under the vibration force of the vibrating screen, and the screen rods move relative to each other.

[0006] Preferably, an elastic sealing cover film is installed on the groove frame, and both ends of the screen rod penetrate the elastic sealing cover film and extend into the triangular groove, and the screen rod is tightly attached to the elastic sealing cover film.

[0007] Preferably, strip-shaped protrusions are fixedly installed at both ends of the elastic sealing cover film, end pieces are installed at both ends of the groove frame, and a groove for limiting the strip-shaped protrusions is arranged on the side of the end piece close to the elastic sealing cover film.

[0008] Preferably, a plurality of hemispherical protruding films are arranged outside the elastic sealing cover film, and the circumference of the circular hole is greater than the cross-sectional circumference of the screen rod, and the screen rod is tightly attached to the elastic sealing cover film after penetrating the elastic sealing cover film.

[0009] Preferably, a plurality of limiting sleeves are fixedly installed on one side of the screen rod with downward top angles, extension shaft bodies are slidably connected inside the limiting sleeves, one end of the extension shaft body penetrates the inner wall of the limiting sleeve and extends to the outside, and the end is in contact with one side of the screen rod with upward top angles, a circular panel is fixedly installed on the extension shaft body, and a return spring is connected between the circular panel and the inner wall of the limiting sleeve.

[0010] Preferably, a rotating sleeve is rotatably connected to the inner wall of the limiting sleeve, and the end of the extension shaft body away from the outside of the limiting sleeve is located inside the rotating sleeve, and symmetrical sliding shaft bodies are installed on the extension shaft body, wherein the inner wall of the rotating sleeve is provided with symmetrical adjusting grooves, the sliding shaft bodies are limited to slide on the adjusting grooves, and the adjusting grooves comprise a vertical sliding groove one, a spiral groove one communicated with the vertical sliding groove one and a vertical sliding groove two communicated with the spiral groove one.

[0011] Preferably, the rotating sleeve is provided with an action sleeve, wherein the inner wall of the action sleeve is symmetrically provided with a driving shaft body, and the outer wall of the rotating sleeve is provided with a spiral groove two, the end of the driving shaft body is located inside the spiral groove two, the limiting sleeve is provided with a through groove, the action sleeve is symmetrically provided with an extension plate frame, the end of the extension plate frame penetrates through the through groove and extends to the outside, and the extension plate frame is limited to slide on the through groove, and adjacent two extension plate frames are connected with a steel blade one.

[0012] Preferably, one end of the extension shaft body located outside the limiting sleeve is provided with a rolling ball.

[0013] Preferably, a plurality of steel blades two are fixedly installed on both sides of each screen rod, and the steel blades two on adjacent two screen rods are staggered.

[0014] Preferably, the screen rod is provided with an air hole, and the air hole is arranged in an arc shape and inwardly close to the air outlet end.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] The present application utilizes the screen rods with opposite installation directions to screen the materials, and the relative movement between the screen rods is realized by compressing the elastic column, so that the size of the aperture can be changed, which is beneficial to the discharge of the blocked materials. Compared with the vibrating ball, the screening efficiency of the present application is high, and the screen surface will not be damaged. At the same time, under the action of the elastic sealing cover film, the screening of the materials on the screen rod can be effectively ensured, and the screen rod and the support are approximately rigidly connected, so that the relative impact will be generated during the vibration process, the impact damage to the blocked materials will be generated, and the situation of the blocked materials between the screen rods will be overcome. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structural principle of the present application;

[0018] Figure 2 It is a schematic diagram of the structural principle of the present application;

[0019] Figure 3 It is a schematic diagram of the structural principle of the present application;

[0020] Figure 4 It is a schematic diagram of the structural principle of the present application;

[0021] Figure 5 It is a schematic diagram of the overall structure of the present application;

[0022] Figure 6 It is a schematic diagram of the structural separation of the present application;

[0023] Figure 7 It is a schematic diagram of the structure of the present application;

[0024] Figure 8 Figure 1 is a schematic diagram of the slot frame structure of the present application;

[0025] Figure 9 Figure 2 is a schematic diagram of the end piece structure of the present application;

[0026] Figure 10 Figure 3 is a schematic diagram of the support structure of the present application;

[0027] Figure 11 Figure 4 is a schematic diagram of the front view of the support and screen rod structure of the present application;

[0028] Figure 12 Figure 5 is a schematic diagram of the internal structure of the slot frame and support of the present application;

[0029] Figure 13 Figure 6 is a schematic diagram of the elastic cover film structure of the present application;

[0030] Figure 14 Figure 7 is a schematic diagram of the screen rod structure in Example 1 of the present application;

[0031] Figure 15 Figure 8 is a schematic diagram of the front view of the screen rod structure in Example 1 of the present application;

[0032] Figure 16 Figure 9 is a schematic diagram of the limiting sleeve structure in Example 1 of the present application;

[0033] Figure 17 Figure 10 is a schematic diagram of the internal structure of the limiting sleeve in Example 1 of the present application;

[0034] Figure 18 Figure 11 is a schematic diagram of the internal structure of the rotating sleeve of the present application;

[0035] Figure 19 Figure 12 is a schematic diagram of the external wall structure of the rotating sleeve of the present application;

[0036] Figure 20 Figure 13 is a schematic diagram of the screen rod structure in Example 2 of the present application;

[0037] Figure 21 Figure 14 is a schematic diagram of the top view of the screen rod structure in Example 2 of the present application;

[0038] Figure 22 Figure 15 is a schematic diagram of the front view of the screen rod structure in Example 2 of the present application.

[0039] In the figure: 1, cross frame; 2, groove frame; 3, screen rod; 4, elastic sealing cover film; 41, strip-shaped protrusion; 5, support; 51, rectangular groove body; 52, triangular groove body; 53, vertical groove body; 6, elastic column; 7, end piece; 71, slotted; 8, limiting sleeve; 81, extended shaft body; 811, circular panel; 812, sliding shaft body; 813, rolling ball; 82, reset spring; 83, rotating sleeve; 831, acting sleeve; 832, driving shaft body; 833, helical groove two; 834, extended plate frame; 835, steel blade one; 84, adjusting groove; 841, vertical sliding groove one; 842, helical groove one; 843, vertical sliding groove two; 85, through groove; 9, steel blade two; 91, air hole. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0041] Please refer to Figures 1-22 The present application provides a technical solution: a variable aperture screen surface. The present application improves the technical problems in the background art. The present application uses the amplitude difference of adjacent screen rods and the acceleration mutation in the vibration process to obtain the effect of preventing hole blocking. The present application comprises two cross frames 1, groove frames 2 connected to both ends of the two cross frames 1, and a plurality of screen rods 3 located between the two cross frames 1. The screen rods 3 are parallel to the cross frames 1 and connected to the groove frames 2. Further, the cross section of the screen rods 3 is an isosceles triangle, i.e., a triangular prism. The top angles of every two adjacent screen rods 3 are opposite. The screen rods 3 with the top angle upward and the bottom edge upward are alternately arranged between the two cross frames 1. As shown in the attached drawings, the screen rods 3 are arranged in a staggered manner. Figures 5-7As shown in FIGS. 11, the adjacent two screen rods 3 are in opposite conditions, and when the plurality of screen rods 3 are in action, the movement trajectories between every adjacent two screen rods 3 are opposite, so as to realize the change of the aperture size; wherein a plurality of supports 5 are fixedly installed inside the groove frame 2, and the supports 5 and the screen rods 3 are one-to-one corresponding, the support 5 is internally provided with a rectangular groove body 51, a triangular groove body 52 communicated with the rectangular groove body 51 and a vertical groove body 53 communicated with the triangular groove body 52, both ends of the screen rod 3 are located inside the triangular groove body 52 and are limited to slide therein, wherein an elastic column 6 is fixedly installed inside the rectangular groove body 51, the elastic column 6 is in contact with the bottom edge of the screen rod 3, so that the screen rod 3 is compressed to the elastic column 6 under the vibration force of the vibrating screen, and the screen rods 3 are relatively moved; it should be noted that, since the top corners (and the bottom surface) between every adjacent two screen rods 3 are in opposite conditions, and the positions of the rectangular groove body 51, the triangular groove body 52 and the vertical groove body 53 on every adjacent two supports 5 are also in opposite conditions, for details, please refer to the specific structure of the support 5 in FIGS. 11. Figure 11 Wherein the elastic cover film 4 is installed on the groove frame 2, and the screen rods 3 penetrate through the elastic cover film 4 and extend into the triangular groove body 52, the screen rods 3 are tightly attached to the elastic cover film 4, the outside of the elastic cover film 4 has a plurality of semispherical convex films, and the circular hole circumference is larger than the cross-sectional circumference of the screen rod 3, the screen rod 3 is tightly attached to the elastic cover film 4 after penetrating through the elastic cover film 4, the elastic cover film 4 is elastically deformed with the movement of the screen rod 3, and is tightly attached, which prevents the invasion of small materials into the groove frame 2, and since the outside of the elastic cover film 4 has a plurality of semispherical convex films, when the materials fall into the corresponding range, the elastic cover film 4 rebounds the materials; and the end piece 7 is installed at both ends of the groove frame 2.

[0042] Further, the support 5 and the screen rod 3 can be made of hard nylon, when the screen rod 3 moves in the triangular groove body 52, the self-lubricating effect between the nylon parts can be realized, and since the side surface (i.e. the corresponding surface of the equal sides of the isosceles triangle) of the screen rod 3 and the support 5 are in approximate rigid contact, relative impact will be generated in the vibration process, which will impact and damage the blocked hole materials, which is beneficial to overcome the blocked hole condition of the materials between the screen rods 3; wherein the top and bottom of the support 5 are provided with semicircular grooves, and the top and bottom of the inner cavity of the groove frame 2 are provided with semicircular ribs matched with the semicircular grooves, and the specific structure is shown in FIGS. 11. Figure 12 As shown in FIGS. 11, the edges of the upper and lower surfaces of the support 5 towards the center of the screen surface are provided with recesses matched with the corresponding grooves on the inner side of the groove frame 2, which play a role in positioning and compressing the elastic cover film 4; and the end piece 7 is provided with the same semicircular grooves as the support 5, and when installed, the end piece 7 is installed between the two end supports 5 and the horizontal frame 1, which is used to compensate the aperture between the support 5 and the horizontal frame 1, so as to ensure that the edge aperture is consistent with the aperture between other screen rods 3, and the elastic cover film 4 is fixedly installed with a strip-shaped protrusion 41 at both ends, wherein the side of the end piece 7 close to the elastic cover film 4 is provided with a slot 71 for limiting the strip-shaped protrusion 41 (combined with FIG. 11). Figure 9 、 12(and 13); The cross frame 1 has mounting holes at both ends for mounting and fixing the screen surface to the vibrating screen;

[0043] The following two methods can be used to install the above components:

[0044] a. At the middle section of the channel frame 2, the semi-circular edge is broken off, with the break length slightly greater than the width of the support 5. The channel frame 2 and the cross frame 1 are pre-welded. During installation, the support 5 is installed through the middle section of the channel frame 2, and then pushed sequentially along the semi-circular edge to both sides of the channel frame 2. After the last support 5 is installed, it is positioned with screws, and the mounting hole is sealed with a threaded cap.

[0045] b. An integrated structure can be adopted, with the support 5 installed from one side of the slot frame 2. After all the supports 5 are installed, the slot frame 2 and the cross frame 1 are connected. At this time, the inner semi-circular edge is through, and the screws, threaded caps and corresponding mounting holes are eliminated. The above two installation methods can be selected according to the actual working environment.

[0046] Combined with appendix Figures 1-4 As shown, this invention utilizes the amplitude difference between adjacent screen rods 3 and the abrupt acceleration change during vibration to achieve the principle of preventing clogging: when the displacement response of the frame under the action of the vibrating screen is Xo, the dynamic model of each screen rod 3 under the excitation of the frame displacement is: m i x i +c i (x i -x o )+k i (x i -x o ) = 0 (i = 1, 2, ..., n);

[0047] Where n is the total number of sieve rods 3, mi is the mass of the i-th sieve rod 3, and x i The displacement response of the i-th sieve rod 3, k i c i Let k be the equivalent stiffness and corresponding damping of the i-th screen rod 3 under the combined action of support 5 and elastic column 6 in the direction perpendicular to the screen surface. When the relative motion causes the waist-corresponding surface of screen rod 3 to disengage from support 5, the equivalent stiffness is k. i When the relative motion causes the corresponding surface of the screen rod 3 to contact the support 5, the equivalent stiffness is k1, and k2 is much greater than k1.

[0048] For the motion direction shown in the figure, the position stiffness k of the even-numbered sequence i =k 2j =k2,x i <x o (k1, x i ≥x o ), sieve rod 3 at x o The positive amplitude is greater than that of the frame (denoted as Class I sieve rod 3); the positional stiffness k of the odd sequencei = k 2j-1 = k1, x i < x o (k2, x i ≥ x o ), the sieve bar 3 in the x o negative direction amplitude is greater than the frame (denoted as type II sieve bar 3);

[0049] When the vibrating screen is in a steady state vibration, the sieve bar 3 in the direction towards the elastic column 6 can obtain a greater amplitude than the frame, and the vibration intensity of the sieve surface is enhanced by using secondary vibration. In the direction away from the elastic column 6, the amplitude is similar to that of the frame, and the purpose of destroying and removing the blocked hole materials is achieved by the relative impact of the sieve bar 3 and the support 5; the response of the legend is m i x i + c i (x i -x o ) + k i (x i -x o ) = 0 (i = 1, 2,..., 15);

[0050] m0x0 + c0x0 + c i (x0-x i ) + k0x o + k i (x0-x i ) = F sin wt coupling, m1 and m2 are estimated to be 0.5 kg, k1 is 3000 N / m, k2 is 1000000 N / m, c1 is 30 Ns / m, c2 is 1000 Ns / m, m0 is 100 kg, F is 4000 N, w is 16 Hz, k0 is 100000 N, and c0 is 1000 Ns / m;

[0051] The initial aperture between adjacent sieve bars 3 is d0 = (l-a)cosθ, where l is the center distance between the sieve bars 3, a is the length of the base of the sieve bar 3 cross-sectional triangle 1 / 2, and θ is the top angle of the sieve bar 3 cross-sectional triangle 1 / 2;

[0052] Δx is the absolute value of the displacement response difference between adjacent sieve bars 3. When 0 ≤ Δx < a / tanθ + ltanθ, the aperture between adjacent sieve bars 3 is dt = (l-aΔxtanθ)cosθ, and the aperture increases with the increase of Δx;

[0053] When Δx > a / tanθ + ltanθ, the aperture between adjacent sieve bars 3 is √(Δx-a / tanθ) 2 + l 2 ; the aperture increases with the increase of Δx;

[0054] The periodic change of Δx in the vibration process will cause the aperture to have a periodic change, which is beneficial to overcome the hole blocking phenomenon on the screen surface;

[0055] Specifically, during the working process, the power of the vibrating screen causes the screen rod 3 to move, that is, the screen rod 3 compresses the elastic column 6, and the movement directions of adjacent screen rods 3 are opposite, thereby realizing the change of the aperture size, which is beneficial to the discharge of the blocked material. Meanwhile, as described above, the support 5 and the screen rod 3 can both be made of hard nylon. When the screen rod 3 moves in the triangular groove 52, the self-lubrication effect between the nylon parts can be realized. Since the screen rod 3 side (i.e., the corresponding surface of the isosceles triangle) and the support 5 are in approximate rigid contact, a relative impact will be generated during the vibration process, which will impact and damage the blocked material, thereby overcoming the hole blocking of the material between the screen rods 3;

[0056] Embodiment one: For some materials with a larger volume, when the material is too large (larger than the maximum value of the aperture), the material will still accumulate between the screen rods 3. Therefore, the present application is designed as follows: each screen rod 3 with a downward top corner is fixedly installed on one side with a plurality of limiting sleeves 8, and the limiting sleeve 8 is internally installed with an extension shaft body 81 in sliding connection therewith. One end of the extension shaft body 81 penetrates through the inner wall of the limiting sleeve 8 and extends to the outside, and is in contact with one side of the screen rod 3 with an upward top corner. Further, the extension shaft body 81 is installed with a rolling ball body 813 at the contact position with one side of the screen rod 3. A circular panel 811 is fixedly installed on the extension shaft body 81, and a return spring 82 is connected between the circular panel 811 and the inner wall of the limiting sleeve 8. In the initial state, the return spring 82 is in a compressed state. A rotating sleeve 83 is rotatably connected to the inner wall of the limiting sleeve 8, and the end of the extension shaft body 81 away from the outside of the limiting sleeve 8 is located in the rotating sleeve 83. Symmetrical sliding shaft bodies 812 are installed on the extension shaft body 81. The inner wall of the rotating sleeve 83 is symmetrically provided with an adjusting groove 84, and the sliding shaft bodies 812 are limitingly slid on the adjusting groove 84. The adjusting groove 84 comprises a vertical sliding groove one 841, a spiral groove one 842 in communication with the vertical sliding groove one 841, and a vertical sliding groove two 843 in communication with the spiral groove one 842. In the initial state, the sliding shaft bodies 812 are located at the end of the vertical sliding groove one 841.

[0057] And the rotating sleeve 83 is provided with an acting sleeve 831, the inner wall of the acting sleeve 831 is symmetrically provided with a driving shaft body 832, and the outer wall of the rotating sleeve 83 is provided with a spiral groove two 833, the end of the driving shaft body 832 is located in the spiral groove two 833, the limiting sleeve 8 is provided with a through groove 85, the acting sleeve 831 is symmetrically provided with an extension plate frame 834, the end of the extension plate frame 834 penetrates through the through groove 85 and extends to the outside, and the extension plate frame 834 is limited to slide on the through groove 85, a steel blade one 835 is connected between two adjacent extension plate frames 834, and it should be noted that the height difference between the initial end and the terminal end of the spiral groove one 842 is less than the height difference between the initial end and the terminal end of the spiral groove two 833, the spiral angle between the initial end and the terminal end of the spiral groove one 842 is the same as the spiral angle between the initial end and the terminal end of the spiral groove two 833, so that when the extension shaft body 81 moves outward by a small distance, the sliding shaft body 812 on the extension shaft body 81 will exert force on the spiral groove one 842 in the inner wall of the rotating sleeve 83, that is, the rotating sleeve 83 is subjected to a small angle rotation due to force, because the spiral angle between the initial end and the terminal end of the spiral groove two 833 is the same as the spiral angle between the initial end and the terminal end of the spiral groove one 842, and the height difference between the initial end and the terminal end of the spiral groove two 833 is greater than the height difference between the initial end and the terminal end of the spiral groove one 842, so that when the rotating sleeve 83 rotates, the spiral groove two 833 in the outer wall will act on the driving shaft body 832 in the inner wall of the acting sleeve 831, so that the acting sleeve 831 drives the extension plate frame 834 and the steel blade one 835 thereon to move directionally, if there is a large size material at this time, the steel blade one 835 will cut the large size material;

[0058] As an implementation of this embodiment: combined with the attached Figures 14-19As shown, when the bottom-up screen rod 3 performs the lifting action, its adjacent bottom-down screen rod 3 performs the descending action. Since the reset spring 82 between the circular panel 811 and the limiting sleeve 8 is in the compressed state in the initial state, the end of the extension shaft body 81 (rolling ball 813) moves outward at this time and is always in close contact with the side of the bottom-down screen rod 3. During the outward movement of the extension shaft body 81, the sliding shaft body 812 thereon moves away from the inside of the vertical groove 53 and exerts a force on the helical groove one 842 of the inner wall of the rotating sleeve 83, so that the rotating sleeve 83 rotates directionally inside the limiting sleeve 8. During the rotation of the rotating sleeve 83, the helical groove two 833 of the outer wall thereof exerts a force on the driving shaft body 832 of the inner wall of the action sleeve 831, so that the action sleeve 831 drives the extension plate frame 834 to directional action under the action of the driving shaft body 832, and the steel blade one 835 on the extension plate frame 834 cuts the large-sized material. When the bottom-up screen rod 3 performs the descending action, its adjacent bottom-down screen rod 3 performs the lifting action. At this time, the end of the extension shaft body 81 (rolling ball 813) is compressed and moves inward, and the sliding shaft body 812 on the extension shaft body 81 exerts a force on the helical groove one 842 of the inner wall of the rotating sleeve 83, so that the rotating sleeve 83 reversely rotates. At this time, under the action of the helical groove two 833, the sliding shaft body 812 on the action sleeve 831 is subjected to a force to drive the action sleeve 831, the extension plate frame 834 and the steel blade one 835 thereon to reverse action.

[0059] In the second embodiment, a plurality of steel blades two 9 are fixedly installed on both sides of each screen rod 3, and the steel blades two 9 on adjacent two screen rods 3 are arranged in a staggered manner. The screen rod 3 is provided with an air hole 91, and the air hole 91 is arranged in an arc shape close to the air outlet end. Figures 20-22 As shown, the air hole 91 inhales air to exert a force on the material, so that the material is close to the steel blade two 9. Under the action of the screen rod 3, the steel blade two 9 cuts the material, thereby achieving the purpose of cutting and separating the material.

[0060] It should be noted that in this document, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying that there is any such actual relationship or order between these entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus that includes a list of elements does not only include those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0061] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A variable aperture screen surface, characterized by, It comprises two horizontal frames (1), groove frames (2) connected to both ends of the two horizontal frames (1), and a plurality of screen rods (3) located between the two horizontal frames (1), wherein the screen rods (3) are parallel to the horizontal frames (1) and connected to the groove frames (2); The screen rods (3) are isosceles triangular three-prism, and the top angles of every two adjacent screen rods (3) are opposite to each other, and the screen rods (3) with the top angle upward and the bottom edge upward are alternately arranged between the two horizontal frames (1). The groove frame (2) is internally fixedly installed with multiple supports (5), and the supports (5) and the screen rods (3) are one-to-one corresponding, the supports (5) are internally provided with a rectangular groove (51), a triangular groove (52) communicated with the rectangular groove (51) and a vertical groove (53) communicated with the triangular groove (52), both ends of the screen rod (3) are located in the triangular groove (52) and limit sliding movement therein, wherein the rectangular groove (51) is internally fixedly installed with an elastic column (6), the elastic column (6) is in contact with the bottom edge of the screen rod (3) to compress the elastic column (6) under the vibration force of the vibrating screen, and the screen rods (3) relatively move; a plurality of limiting sleeves (8) are fixedly installed on one side of the screen rod (3) with the top corner downward, the limiting sleeve (8) is internally installed with an extension shaft body (81) in sliding connection therewith, one end of the extension shaft body (81) penetrates the inner wall of the limiting sleeve (8) and extends to the outside, and is in contact with one side of the screen rod (3) with the top corner upward, a circular panel (811) is fixedly installed on the extension shaft body (81), and a return spring (82) is connected between the circular panel (811) and the inner wall of the limiting sleeve (8); the limiting sleeve (8) is internally installed with a rotating sleeve (83) in rotating connection with the inner wall thereof, and the end of the extension shaft body (81) away from the outside of the limiting sleeve (8) is located in the rotating sleeve (83), and symmetrical sliding shaft bodies (812) are installed on the extension shaft body (81), wherein the inner wall of the rotating sleeve (83) is symmetrically provided with an adjusting groove (84), the sliding shaft bodies (812) limit sliding movement on the adjusting groove (84), and the adjusting groove (84) comprises a vertical sliding groove one (841), a spiral groove one (842) communicated with the vertical sliding groove one (841) and a vertical sliding groove two (843) communicated with the spiral groove one (842); an action sleeve (831) is installed on the rotating sleeve (83), wherein the inner wall of the action sleeve (831) is symmetrically installed with a driving shaft body (832), a spiral groove two (833) is arranged on the outer wall of the rotating sleeve (83), and the end of the driving shaft body (832) is located in the spiral groove two (833), a through groove (85) is arranged on the limiting sleeve (8), symmetrical extension plate frames (834) are installed on the action sleeve (831), the end of the extension plate frame (834) penetrates the through groove (85) and extends to the outside, and the extension plate frame (834) limits sliding movement on the through groove (85), and a steel blade one (835) is connected between two adjacent extension plate frames (834); multiple steel blade twos (9) are fixedly installed on both sides of each screen rod (3), and the steel blade twos (9) on two adjacent screen rods (3) are staggered.

2. A variable aperture screen according to claim 1, wherein: The elastic cover film (4) is installed on the groove frame (2), and the screen rods (3) penetrate the elastic cover film (4) and extend to the inside of the triangular groove (52), and the screen rods (3) are closely attached to the elastic cover film (4).

3. A variable aperture screen according to claim 2, wherein: The elastic cover film (4) is fixedly installed with a strip-shaped protrusion (41) at both ends, and an end piece (7) is installed at both ends of the groove frame (2), wherein the end piece (7) is provided with a slotted hole (71) for limiting the strip-shaped protrusion (41) on the side close to the elastic cover film (4).

4. A variable aperture screen according to claim 2, wherein: The elastic cover film (4) is provided with a plurality of hemispherical protrusions on the outer side, and the circumference of the circular hole is greater than the cross-sectional circumference of the screen rod (3), and the screen rod (3) is tightly fitted with the elastic cover film (4) after penetrating the elastic cover film (4).

5. A variable aperture screen according to claim 1, wherein: The extending shaft body (81) is installed with a rolling ball body (813) at one end outside the limiting sleeve (8).

6. A variable aperture screen according to claim 1, wherein: The screen rod (3) is provided with an air hole (91), and the air hole (91) is arranged in an arc shape and inwardly arranged close to the air outlet end.

Images