Road pavement cement stabilized macadam aggregate screening device and screening method thereof

Abstract

The invention discloses a road pavement cement stabilized macadam aggregate screening device and a screening method thereof, and relates to the technical field of aggregate screening, the road pavement cement stabilized macadam aggregate screening device comprises a rectangular frame, a trapezoidal frame is arranged above the top surface of the rectangular frame, a fixed support is fixedly arranged on the left side in the trapezoidal frame, and a servo motor is fixedly arranged in the middle of the top surface of the fixed support; a fixing shaft is fixedly arranged at the end of a motor shaft of the servo motor and connected with the rectangular frame through an eccentric mechanism. A first screen in left-right sliding connection is arranged on the top surface of the trapezoidal frame, and the first screen is connected with the fixed shaft through a crank mechanism; a third screen in left-right sliding connection is arranged on the top surface of the rectangular frame, and the third screen is connected with the trapezoidal frame through a connecting rod mechanism; a second screen is arranged between the first screen and the third screen and connected with the rectangular frame through a swing mechanism. By the adoption of the multi-stage layered screening mechanism, broken stones can be fully screened, and the working efficiency of follow-up operation is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of aggregate screening, and in particular to a road paving cement-stabilized crushed stone aggregate screening device and a screening method thereof. Background Art

[0002] Cement stabilized gravel uses graded gravel as aggregate, uses a certain amount of cementitious materials and sufficient mortar volume to fill the gaps in the aggregate, and is spread and compacted according to the interlocking principle. Its compaction degree is close to its density, and its strength mainly depends on the interlocking principle between the gravel, and at the same time, there is sufficient mortar volume to fill the gaps in the aggregate. As the Chinese utility model discloses, a road paving cement stabilized gravel aggregate screening device (publication number: CN219377359U), including a shell, a flap, a servo motor and a transmission shaft, the two sides of the inner top of the shell are respectively movably hinged with flaps, the middle position of the outer top of the shell is fixedly connected to a servo motor, and a cross bar is fixedly connected between the two sides of the inner bottom of the shell.

[0003] The cement-stabilized crushed stone base material needs to be crushed by a crusher during the acquisition process, and the crushed aggregate needs to be screened according to the particle size. When the cement-stabilized crushed stone is screened, there are the following disadvantages: there is no targeted screening for cement aggregates of different sizes, resulting in insufficient screening of the crushed stone, and also resulting in low work efficiency. Due to the large amount of cement crushed stone used, when the content of coarse or fine material is too much, the subsequent mixture will be unevenly mixed, and the road surface cannot be paved, which is easy to cause the cement-stabilized crushed stone to loosen and gaps to appear. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcoming of poor cement-stabilized gravel screening effect in the prior art, and to propose a road paving cement-stabilized gravel aggregate screening device and screening method thereof.

[0005] In order to solve the problem of poor screening effect of cement-stabilized crushed stone in the prior art, the present invention adopts the following technical solution:

[0006] A road paving cement stabilized gravel aggregate screening device comprises a rectangular frame, a plurality of support seats arranged side by side are fixedly arranged on the front and rear sides of the bottom of the rectangular frame, a trapezoidal frame with a movable hinge on the left side is arranged above the top surface of the rectangular frame, a fixed bracket is fixedly arranged on the left side of the trapezoidal frame, a servo motor with an output end facing forward is fixedly arranged in the middle of the top surface of the fixed bracket, a coaxially connected fixed shaft is fixedly arranged on the motor shaft end of the servo motor, and the fixed shaft is connected to the rectangular frame through an eccentric mechanism;

[0007] A first screen mesh is provided on the top surface of the trapezoidal frame and is connected to the fixed shaft by a crank mechanism; a third screen mesh is provided on the top surface of the rectangular frame and is connected to the trapezoidal frame by a connecting rod mechanism; a second screen mesh is provided between the first screen mesh and the third screen mesh, and the second screen mesh is connected to the rectangular frame by a swing mechanism;

[0008] The inner bottom wall of the first screen is provided with a plurality of evenly arranged large particle sieve holes, the inner bottom wall of the second screen is provided with a plurality of evenly arranged medium particle sieve holes, and the inner bottom wall of the third screen is provided with a plurality of evenly arranged small particle sieve holes.

[0009] Preferably, two double-ear seats are fixedly provided at the two left corners of the top surface of the rectangular frame, and two single-ear seats are fixedly provided at the two left corners of the bottom surface of the trapezoidal frame, and each of the double-ear seats is movably hinged with the single-ear seat on the corresponding side through a pin shaft;

[0010] A pair of first T-shaped seats are fixedly provided on the left sides of the front and rear sides of the top surface of the rectangular frame, and a pair of second T-shaped seats are fixedly provided on the left sides of the front and rear sides of the bottom surface of the trapezoidal frame. A buffer spring with upper and lower ends fixedly connected is provided between each of the first T-shaped seats and the second T-shaped seat on the corresponding side.

[0011] Preferably, the eccentric mechanism includes a cam and a fixed pulley, an eccentrically fixed cam is sleeved on the middle part of the fixed shaft, a reinforcement plate with front and rear ends fixedly connected is provided on the left side of the rectangular frame, a pulley bracket is fixed on the middle part of the top surface of the reinforcement plate, a rotatably connected fixed pulley is provided in the opening of the pulley bracket, the fixed pulley is located directly below the cam, and the outer ring bottom surface of the cam slides against the outer ring top surface of the fixed pulley.

[0012] Preferably, a pair of first connecting blocks are fixedly provided on the front and rear sides of the top surface of the trapezoidal frame, a laterally distributed first sliding rod is fixedly provided between each pair of the first connecting blocks, a pair of first sliding seats are fixedly provided on the front and rear side walls of the first screen, each pair of the first sliding seats is slidably mounted on the first sliding rod on the corresponding side, and the two sections of each of the first sliding rods are mounted with a first spring.

[0013] Preferably, the crank mechanism includes a crank swing arm and an articulated connecting rod, the crank swing arm is fixedly provided at the front end of the fixed shaft, the first screen is fixedly provided with a first ear seat on the left side wall, and an articulated connecting rod with both ends movably hinged is provided between the outer end of the crank swing arm and the outer end of the first ear seat.

[0014] Preferably, a pair of second connecting blocks are fixedly provided on the front and rear sides of the top surface of the rectangular frame, a transversely distributed second sliding rod is fixedly provided between each pair of the second connecting blocks, a pair of second sliding seats are fixedly provided on the front and rear side walls of the third screen, each pair of the second sliding seats is slidably mounted on the second sliding rod on the corresponding side, and two sections of each of the second sliding rods are mounted with second springs.

[0015] Preferably, the connecting rod mechanism includes a positioning connecting rod, a pair of obliquely distributed fifth ear seats are fixedly provided on the front and rear oblique side portions of the trapezoidal frame, a pair of fourth ear seats are fixedly provided on the left side wall of the third screen, and a positioning connecting rod with both ends movably hinged is provided between the outer end portion of each fourth ear seat and the outer end portion of the fifth ear seat on the corresponding side.

[0016] Preferably, a pair of vertically distributed second ear seats are fixedly provided on the right side of the bottom surface of the trapezoidal frame, and a pair of laterally distributed third ear seats are fixedly provided on the right side wall of the second screen, and the bottom end of each second ear seat is movably hinged to the outer end of the third ear seat on the corresponding side through a pin shaft.

[0017] Preferably, the swing mechanism includes an arc-shaped baffle and a limit clamp wheel. A pair of symmetrically distributed arc-shaped baffles are fixedly provided on the front and rear side walls of the second screen. A pair of vertically distributed supporting vertical plates are fixedly provided on the front and rear side edges of the bottom face of the rectangular frame. A pair of rotatably connected driven shafts are inserted into the relative top ends of the pair of supporting vertical plates. A pair of relative inner ends of the driven shafts are sleeved with concentrically fixed limit clamp wheels. Each of the limit clamp wheels is slidably engaged in the arc-shaped inner side surface of the arc-shaped baffle on the corresponding side.

[0018] The present invention also proposes a screening method of a road paving cement stabilized gravel aggregate screening device, comprising the following steps:

[0019] Step 1: Under the action of gravity of the trapezoidal frame and the first screen, the cam is always pressed against the fixed pulley; and the servo motor is started, and the motor shaft of the servo motor drives the fixed shaft, the cam, and the crank swing arm to rotate synchronously. Since the cam adopts an eccentric design, the cam is lifted along the fixed pulley, driving the fixed bracket, the trapezoidal frame, the first screen and the second screen to reciprocate and articulate and swing around the hinge point of the double-ear seat and the single-ear seat;

[0020] Step 2: When the crank swing arm rotates, the crank swing arm drives the first screen and the first sliding seat to slide back and forth along the first sliding rod through the hinged action of the hinged connecting rod and the first ear seat;

[0021] Step 3: When the trapezoidal frame swings back and forth, the fifth ear seat drives the third screen and the second sliding seat to slide back and forth along the second sliding rod through the hinged connection between the positioning connecting rod and the fourth ear seat;

[0022] Step 4: Under the action of gravity of the second screen, the arc baffle is always pressed against the limit clamp wheel. When the trapezoidal frame swings back and forth, the hinged action of the second ear seat and the third ear seat drives the arc baffle to slide along the limit clamp wheel, and synchronously drives the second screen to swing back and forth in a hinged manner;

[0023] Step 5: When the cement aggregate is screened, the cement aggregate is poured into the first screen, and the cement aggregate is preliminarily screened by the reciprocating hinged swing and reciprocating sliding action of the first screen;

[0024] After the initial screening, the cement aggregate falls into the second screen through the large particle screen holes, and the cement aggregate is screened for the second time through the reciprocating hinged swing of the second screen;

[0025] The cement aggregate after the secondary screening falls into the third screen through the medium particle sieve holes, and is screened again through the reciprocating sliding of the third screen. The cement aggregate after the second screening falls onto the ground through the small particle sieve holes.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present invention, through the coordinated use of the eccentric mechanism and the crank mechanism, when the crank swing arm rotates, the crank swing arm drives the first screen and the first sliding seat to slide reciprocatingly along the first sliding rod through the hinged action of the hinged connecting rod and the first ear seat, and the cement aggregate is preliminarily screened under the reciprocating hinged swing and reciprocating sliding action of the first screen;

[0028] 2. In the present invention, through the coordinated use of the eccentric mechanism and the connecting rod mechanism, when the trapezoidal frame swings back and forth, the fifth ear seat drives the third screen and the second sliding seat to slide back and forth along the second sliding rod through the hinged action of the positioning connecting rod and the fourth ear seat, and the cement aggregate after the initial screening falls into the second screen through the large particle sieve hole, and the cement aggregate is screened for the second time through the reciprocating hinged swing of the second screen;

[0029] 3. In the present invention, through the coordinated use of the eccentric mechanism and the swing mechanism, when the trapezoidal frame swings back and forth, the hinged action of the second ear seat and the third ear seat drives the arc baffle to slide along the limit clamping wheel, and synchronously drives the second screen to swing back and forth in a hinged manner. The cement aggregate after the secondary screening falls into the third screen through the medium particle sieve hole, and the cement aggregate is screened again through the reciprocating sliding of the third screen.

[0030] In summary, the present invention solves the problem of poor screening effect of cement-stabilized gravel, and the overall structural design is compact. By adopting a multi-level hierarchical screening mechanism, gravel of different sizes can be effectively screened. The structural stability is good, which not only allows the gravel to be fully screened, but also further improves the work efficiency of its subsequent operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0033] Figure 2 It is a rear view structural schematic diagram of the present invention;

[0034] Figure 3 It is a main exploded schematic diagram of the present invention;

[0035] Figure 4 It is a rear exploded schematic diagram of the present invention;

[0036] Figure 5 It is a schematic diagram of the eccentric mechanism of the present invention;

[0037] Figure 6 It is a schematic diagram of the explosion of the eccentric mechanism of the present invention;

[0038] Figure 7 It is a schematic diagram of the crank mechanism of the present invention;

[0039] Figure 8 It is an exploded schematic diagram of the crank mechanism of the present invention;

[0040] Fig. 9 It is a schematic diagram of the connecting rod mechanism of the present invention;

[0041] Fig.10 It is an exploded schematic diagram of the connecting rod mechanism of the present invention;

[0042] Fig.11 It is a schematic diagram of the swing mechanism of the present invention;

[0043] Fig.12 It is an exploded schematic diagram of the swing mechanism of the present invention;

[0044] Serial numbers in the figure: 1, rectangular frame; 11, double ear seat; 12, single ear seat; 13, buffer spring; 14, reinforcement plate; 15, fixed pulley; 16, fixed bracket; 17, servo motor; 18, fixed shaft; 19, cam; 2, trapezoidal frame; 21, first screen; 22, crank swing arm; 23, hinged connecting rod; 24, first ear seat; 25, first connecting block; 26, first slide bar; 27, first sliding seat; 28, first spring; 3, second screen; 31, second ear seat; 32, third ear seat; 33, arc baffle; 34, support vertical plate; 35, driven shaft; 36, limit clamp wheel; 4, third screen; 41, fourth ear seat; 42, fifth ear seat; 43, positioning connecting rod; 44, second connecting block; 45, second slide bar; 46, second sliding seat; 47, second spring. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0046] Embodiment 1: This embodiment provides a road paving cement stabilized gravel aggregate screening device, see Figure 1-12 Specifically, it includes a rectangular frame 1, a plurality of support seats distributed side by side are fixedly arranged on the front and rear sides of the bottom of the rectangular frame 1, a trapezoidal frame 2 with a movable hinge on the left side is arranged above the top surface of the rectangular frame 1, a fixed bracket 16 is fixedly arranged on the left side of the trapezoidal frame 2, a servo motor 17 with an output end facing forward is fixedly arranged in the middle of the top surface of the fixed bracket 16, a coaxially connected fixed shaft 18 is fixedly arranged at the motor shaft end of the servo motor 17, and the fixed shaft 18 is connected to the rectangular frame 1 through an eccentric mechanism; a first screen 21 connected to the left and right slidingly is arranged on the top surface of the trapezoidal frame 2, and the first screen 21 is connected to the fixed shaft 18 through a crank mechanism; a third screen 4 connected to the left and right slidingly is arranged on the top surface of the rectangular frame 1, and the third screen 4 is connected to the trapezoidal frame 2 through a connecting rod mechanism; a second screen 3 is arranged between the first screen 21 and the third screen 4, and the second screen 3 is connected to the rectangular frame 1 through a swing mechanism;

[0047] Specifically, a plurality of evenly arranged large particle sieve holes are formed on the inner bottom wall of the first sieve 21, a plurality of evenly arranged medium particle sieve holes are formed on the inner bottom wall of the second sieve 3, and a plurality of evenly arranged small particle sieve holes are formed on the inner bottom wall of the third sieve 4.

[0048] In the specific implementation process, Figure 5 and Figure 6As shown, a double-ear seat 11 is fixedly provided at the two left corners of the top surface of the rectangular frame 1, and a single-ear seat 12 is fixedly provided at the two left corners of the bottom surface of the trapezoidal frame 2, and each double-ear seat 11 is movably hinged with the single-ear seat 12 on the corresponding side through a pin shaft; the rectangular frame 1 and the trapezoidal frame 2 are reciprocatingly hinged and swung with the hinge points of the double-ear seat 11 and the single-ear seat 12 as the axis;

[0049] A pair of first T-shaped seats are fixedly provided on the left sides of the front and rear sides of the top surface of the rectangular frame 1, and a pair of second T-shaped seats are fixedly provided on the left sides of the front and rear sides of the bottom surface of the trapezoidal frame 2. A buffer spring 13 with upper and lower ends fixedly connected is provided between each first T-shaped seat and the second T-shaped seat on the corresponding side; the buffer spring 13 plays a role of buffering and shock absorption.

[0050] It should be noted that: in the present embodiment, the eccentric mechanism comprises a cam 19 and a fixed pulley 15, the middle part of the fixed shaft 18 is sleeved with an eccentrically fixed cam 19, a reinforcing plate 14 with front and rear ends fixedly connected is provided on the left side of the rectangular frame 1, a pulley bracket is fixedly provided in the middle of the top surface of the reinforcing plate 14, a rotatably connected fixed pulley 15 is provided in the opening of the pulley bracket, the fixed pulley 15 is located directly below the cam 19, and the outer ring bottom surface of the cam 19 slides against the outer ring top surface of the fixed pulley 15; the motor shaft of the servo motor 17 drives the fixed shaft 18, the cam 19, and the crank arm 22 to rotate synchronously, and because the cam 19 adopts an eccentric design, the cam 19 performs a lifting effect along the fixed pulley 15, driving the fixed bracket 16, the trapezoidal frame 2, the first screen 21 and the second screen 3 to perform reciprocating hinged swinging with the hinge points of the double-ear seat 11 and the single-ear seat 12 as the axis.

[0051] Embodiment 2: In embodiment 1, there is still the problem that the screening effect of the first screen 21 is not good. Therefore, based on embodiment 1, this embodiment further includes:

[0052] In the specific implementation process, Figure 7 and Figure 8 As shown, a pair of first connecting blocks 25 are fixedly provided on both the front and rear sides of the top surface of the trapezoidal frame 2, and a first sliding rod 26 distributed laterally is fixedly provided between each pair of first connecting blocks 25. A pair of first sliding seats 27 are fixedly provided on both the front and rear side walls of the first screen 21, and each pair of first sliding seats 27 is slidably sleeved on the first sliding rod 26 on the corresponding side, and the two sections of each first sliding rod 26 are sleeved with a first spring 28;

[0053] Specifically, the crank mechanism includes a crank swing arm 22 and an articulated connecting rod 23. The crank swing arm 22 is fixedly provided at the front end of the fixed shaft 18, a first ear seat 24 is fixedly provided at the left side wall of the first screen 21, and an articulated connecting rod 23 with two ends movably articulated is provided between the outer end of the crank swing arm 22 and the outer end of the first ear seat 24;

[0054] When the crank arm 22 rotates, the crank arm 22 drives the first screen 21 and the first sliding seat 27 to slide reciprocatingly along the first sliding rod 26 through the hinged action of the hinged connecting rod 23 and the first ear seat 24. The cement aggregate is preliminarily screened through the reciprocating hinged swing and reciprocating sliding action of the first screen 21.

[0055] Embodiment 3: In embodiment 2, there is still the problem that the screening effect of the second screen 3 is not good. Therefore, based on embodiment 2, this embodiment further includes:

[0056] In the specific implementation process, Fig. 9 and Fig.10 As shown, a pair of second connecting blocks 44 are fixedly provided on both sides of the top surface of the rectangular frame 1, and a second sliding rod 45 distributed laterally is fixedly provided between each pair of second connecting blocks 44. A pair of second sliding seats 46 are fixedly provided on both sides of the front and rear walls of the third screen 4. Each pair of second sliding seats 46 is slidably sleeved on the second sliding rod 45 on the corresponding side, and two sections of each second sliding rod 45 are sleeved with a second spring 47. The connecting rod mechanism includes a positioning connecting rod 43. A pair of obliquely distributed fifth ear seats 42 are fixedly provided on the front and rear hypotenuse parts of the trapezoidal frame 2. A pair of fourth ear seats 41 are fixedly provided on the left side wall of the third screen 4. A positioning connecting rod 43 with two ends movably hinged is provided between the outer end of each fourth ear seat 41 and the outer end of the fifth ear seat 42 on the corresponding side.

[0057] When the trapezoidal frame 2 swings back and forth, the fifth ear seat 42 drives the third screen 4 and the second sliding seat 46 to slide back and forth along the second sliding rod 45 through the hinged action of the positioning connecting rod 43 and the fourth ear seat 41, and the cement aggregate after the preliminary screening falls into the second screen 3 through the large-particle sieve holes, and the cement aggregate is screened for the second time through the reciprocating hinged swing of the second screen 3.

[0058] Embodiment 4: In embodiment 3, there is still the problem that the screening effect of the third screen 4 is not good. Therefore, based on embodiment 3, this embodiment further includes:

[0059] In the specific implementation process, Fig.11 and Fig.12 As shown, a pair of second ear seats 31 distributed vertically are fixedly provided on the right side of the bottom surface of the trapezoidal frame 2, and a pair of third ear seats 32 distributed horizontally are fixedly provided on the right side wall of the second screen 3, and the bottom end of each second ear seat 31 is movably hinged to the outer end of the third ear seat 32 on the corresponding side through a pin shaft;

[0060] The swing mechanism includes an arc-shaped baffle plate 33 and a limit clamp wheel 36. A pair of symmetrically distributed arc-shaped baffle plates 33 are fixedly provided on the front and rear side walls of the second screen 3. A pair of vertically distributed supporting vertical plates 34 are fixedly provided on the front and rear side edges of the bottom of the rectangular frame 1. A driven shaft 35 connected in rotation is inserted into the opposite top ends of the pair of supporting vertical plates 34. The opposite inner ends of the pair of driven shafts 35 are sleeved with concentrically fixed limit clamp wheels 36. Each limit clamp wheel 36 is slidably engaged in the arc-shaped inner side surface of the arc-shaped baffle plate 33 on the corresponding side.

[0061] When the trapezoidal frame 2 swings back and forth, the hinged action of the second ear seat 31 and the third ear seat 32 drives the arc baffle 33 to slide along the limit clamping wheel 36, and simultaneously drives the second screen 3 to swing back and forth in a hinged manner. The cement aggregate after the secondary screening falls into the third screen 4 through the medium particle sieve hole, and the cement aggregate is screened again through the reciprocating sliding of the third screen 4.

[0062] Embodiment 5: Specifically, the working principle and operation method of the present invention are as follows:

[0063] Step 1: Under the gravity of the trapezoidal frame 2 and the first screen 21, the cam 19 is driven to always rest against the fixed pulley 15; and the servo motor 17 is started, and the motor shaft of the servo motor 17 drives the fixed shaft 18, the cam 19, and the crank swing arm 22 to rotate synchronously. Since the cam 19 adopts an eccentric design, the cam 19 performs a lifting effect along the fixed pulley 15, driving the fixed bracket 16, the trapezoidal frame 2, the first screen 21 and the second screen 3 to perform reciprocating hinged swing with the hinge points of the double-ear seat 11 and the single-ear seat 12 as the axis;

[0064] Step 2: When the crank swing arm 22 rotates, the crank swing arm 22 drives the first screen 21 and the first sliding seat 27 to slide reciprocatingly along the first sliding rod 26 through the hinged action of the hinged connecting rod 23 and the first ear seat 24;

[0065] Step 3: When the trapezoidal frame 2 swings back and forth, the fifth ear seat 42 drives the third screen 4 and the second sliding seat 46 to slide back and forth along the second sliding rod 45 through the hinged connection between the positioning connecting rod 43 and the fourth ear seat 41;

[0066] Step 4: Under the action of gravity of the second screen 3, the arc baffle 33 is always pressed against the limit clamp wheel 36. When the trapezoidal frame 2 swings back and forth, the hinged action of the second ear seat 31 and the third ear seat 32 drives the arc baffle 33 to slide along the limit clamp wheel 36, and synchronously drives the second screen 3 to swing back and forth in a hinged manner;

[0067] Step 5: When the cement aggregate is screened, the cement aggregate is poured into the first screen 21, and the cement aggregate is preliminarily screened by the reciprocating hinged swing and reciprocating sliding action of the first screen 21;

[0068] After the initial screening, the cement aggregate falls into the second screen 3 through the large particle sieve holes, and the cement aggregate is screened for the second time through the reciprocating hinged swing of the second screen 3;

[0069] The cement aggregate after the secondary screening falls into the third screen 4 through the medium particle sieve holes, and the cement aggregate is screened again through the reciprocating sliding of the third screen 4. The cement aggregate after the secondary screening falls onto the ground through the small particle sieve holes.

[0070] The present invention solves the problem of poor screening effect of cement-stabilized gravel, and the overall structural design is compact. By adopting a multi-level hierarchical screening mechanism, gravel of different sizes can be effectively screened. The structural stability is good, which not only enables the gravel to be fully screened, but also further improves the work efficiency of its subsequent operations.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A road paving cement stabilized gravel aggregate screening device, comprising a rectangular frame (1), characterized in that: A plurality of support seats arranged side by side are fixedly arranged on both sides of the bottom of the rectangular frame (1), a trapezoidal frame (2) with a movable hinged left side is arranged above the top surface of the rectangular frame (1), a fixed bracket (16) is fixedly arranged on the left side of the trapezoidal frame (2), a servo motor (17) with an output end facing forward is fixedly arranged in the middle of the top surface of the fixed bracket (16), a coaxially connected fixed shaft (18) is fixedly arranged at the end of the motor shaft of the servo motor (17), and the fixed shaft (18) is connected to the rectangular frame (1) through an eccentric mechanism; A first screen (21) is provided on the top surface of the trapezoidal frame (2) and is connected to the left and right by sliding, and the first screen (21) is connected to the fixed shaft (18) via a crank mechanism; a third screen (4) is provided on the top surface of the rectangular frame (1) and is connected to the left and right by sliding, and the third screen (4) is connected to the trapezoidal frame (2) via a connecting rod mechanism; a second screen (3) is provided between the first screen (21) and the third screen (4), and the second screen (3) is connected to the rectangular frame (1) via a swing mechanism; The inner bottom wall of the first screen (21) is provided with a plurality of evenly arranged large particle sieve holes, the inner bottom wall of the second screen (3) is provided with a plurality of evenly arranged medium particle sieve holes, and the inner bottom wall of the third screen (4) is provided with a plurality of evenly arranged small particle sieve holes.

2. A road paving cement-stabilized crushed stone aggregate screening device according to claim 1, characterized in that: The rectangular frame (1) is provided with double-ear seats (11) at two left corners of the top surface, and the trapezoidal frame (2) is provided with single-ear seats (12) at two left corners of the bottom surface, and each of the double-ear seats (11) is movably hinged to the single-ear seat (12) on the corresponding side through a pin shaft; A pair of first T-shaped seats are fixedly provided on the left sides of the front and rear sides of the top surface of the rectangular frame (1), and a pair of second T-shaped seats are fixedly provided on the left sides of the front and rear sides of the bottom surface of the trapezoidal frame (2). A buffer spring (13) with upper and lower ends fixedly connected is provided between each of the first T-shaped seats and the second T-shaped seat on the corresponding side.

3. A road paving cement-stabilized crushed stone aggregate screening device according to claim 2, characterized in that: A pair of first connecting blocks (25) are fixedly provided on both the front and rear sides of the top surface of the trapezoidal frame (2), and a transversely distributed first sliding rod (26) is fixedly provided between each pair of the first connecting blocks (25). A pair of first sliding seats (27) are fixedly provided on both the front and rear side walls of the first screen (21), and each pair of the first sliding seats (27) is slidably mounted on the first sliding rod (26) on the corresponding side, and two sections of each first sliding rod (26) are mounted with a first spring (28).

4. A road paving cement-stabilized crushed stone aggregate screening device according to claim 3, characterized in that: The crank mechanism comprises a crank swing arm (22) and an articulated connecting rod (23); the crank swing arm (22) is fixedly provided at the front end of the fixed shaft (18); a first ear seat (24) is fixedly provided at the left side wall of the first screen (21); and an articulated connecting rod (23) with both ends movably articulated is provided between the outer end of the crank swing arm (22) and the outer end of the first ear seat (24).

5. A road paving cement-stabilized crushed stone aggregate screening device according to claim 4, characterized in that: A pair of second connecting blocks (44) are fixedly provided on both the front and rear sides of the top surface of the rectangular frame (1), and a second sliding rod (45) distributed laterally is fixedly provided between each pair of the second connecting blocks (44). A pair of second sliding seats (46) are fixedly provided on both the front and rear side walls of the third screen (4), and each pair of the second sliding seats (46) is slidably sleeved on the second sliding rod (45) on the corresponding side, and two sections of each second sliding rod (45) are sleeved with a second spring (47).

6. A road paving cement-stabilized crushed stone aggregate screening device according to claim 5, characterized in that: The connecting rod mechanism comprises a positioning connecting rod (43), a pair of obliquely distributed fifth ear seats (42) are fixedly provided on the front and rear oblique side portions of the trapezoidal frame (2), a pair of fourth ear seats (41) are fixedly provided on the left side wall of the third screen (4), and a positioning connecting rod (43) with two ends movably hinged is provided between the outer end portion of each fourth ear seat (41) and the outer end portion of the fifth ear seat (42) on the corresponding side.

7. A road paving cement-stabilized crushed stone aggregate screening device according to claim 6, characterized in that: A pair of second ear seats (31) distributed vertically are fixedly provided on the right side of the bottom surface of the trapezoidal frame (2), and a pair of third ear seats (32) distributed laterally are fixedly provided on the right side wall of the second screen (3), and the bottom end of each second ear seat (31) is movably hinged to the outer end of the third ear seat (32) on the corresponding side through a pin shaft.

8. The screening method of the road paving cement stabilized gravel aggregate screening device according to claim 7, characterized in that: The following steps are involved: Step 1: Under the action of gravity of the trapezoidal frame (2) and the first screen (21), the cam (19) is driven to always be against the fixed pulley (15); and the servo motor (17) is started, and the motor shaft of the servo motor (17) drives the fixed shaft (18), the cam (19), and the crank swing arm (22) to rotate synchronously. Since the cam (19) adopts an eccentric design, the cam (19) is lifted along the fixed pulley (15), driving the fixed bracket (16), the trapezoidal frame (2), the first screen (21) and the second screen (3) to reciprocate and articulate and swing around the hinge point of the double-ear seat (11) and the single-ear seat (12) as the axis; Step 2: When the crank swing arm (22) rotates, the crank swing arm (22) drives the first screen (21) and the first sliding seat (27) to slide back and forth along the first sliding rod (26) through the hinged action of the hinged connecting rod (23) and the first ear seat (24); Step 3: When the trapezoidal frame (2) swings back and forth, the fifth ear seat (42) drives the third screen (4) and the second sliding seat (46) to slide back and forth along the second sliding rod (45) through the hinged action of the positioning connecting rod (43) and the fourth ear seat (41); Step 4: Under the action of gravity of the second screen (3), the arc baffle (33) is always pressed against the limit clamp wheel (36). When the trapezoidal frame (2) swings back and forth, the hinged action of the second ear seat (31) and the third ear seat (32) drives the arc baffle (33) to slide along the limit clamp wheel (36), and synchronously drives the second screen (3) to swing back and forth in a hinged manner; Step 5, when the cement aggregate is to be screened, the cement aggregate is poured into the first screen (21), and the cement aggregate is preliminarily screened by the reciprocating hinged swing and reciprocating sliding action of the first screen (21); After the initial screening, the cement aggregate falls into the second screen (3) through the large particle screen holes, and the cement aggregate is screened for the second time through the reciprocating hinged swing of the second screen (3); After the secondary screening, the cement aggregate falls into the third screen (4) through the medium particle sieve holes, and the cement aggregate is screened again through the reciprocating sliding of the third screen (4). After the secondary screening, the cement aggregate falls onto the ground through the small particle sieve holes.

Images