Old asphalt crushing device

Abstract

The present invention belongs to the technical field of crushing equipment, and specifically provides a device for crushing old asphalt materials, including a chassis, a pre-screening component, a first conveying component and a multi-stage crushing component. A plurality of screen bars on the pre-screening component are arranged at equal intervals on a transmission chain. When the material to be crushed enters the chassis, the large volume of the material will fall onto the screen bar below, and then be conveyed to the multi-stage crushing component, and the material will be crushed by the multi-stage crushing component, and the small volume of the material will fall onto the first conveying component below through the gaps between the screen bars. With such an arrangement, on the one hand, the material is preliminarily screened by pre-screening before entering the multi-stage crushing component, and the material that does not need to be crushed is removed to prevent it from being over-crushed. On the other hand, a plurality of screen bars arranged at equal intervals are used to screen the material. When the screen bars move with the transmission chain, the material can be conveyed from the first feed port to the multi-stage crushing component, which has both the screening and conveying functions, killing two birds with one stone.

Description

Technical Field

[0001] The invention belongs to the technical field of crushing, and in particular relates to a device for crushing old asphalt materials. Background Art

[0002] Old asphalt refers to asphalt concrete waste generated after the demolition of engineering buildings. Asphalt concrete waste has a certain recycling value. After being processed by crushing equipment, it can be used again in engineering construction as sand and gravel aggregate. In the prior art, there are jaw crushers, hammer crushers, double-toothed roller crushers, etc. for crushing waste asphalt concrete. When these crushing equipment are working, they need to continuously transport the material to the feed port. After the material is crushed once or multiple times inside the crushing equipment, it is discharged from the discharge port at the bottom, and then the crushed material is transported to the designated location by the conveyor.

[0003] Since the initial volumes of the asphalt concrete waste to be crushed vary, if the materials are directly fed into the crushing equipment from the feed port, small volumes of materials will be over-crushed into powder, and the particle sizes of the crushed products will vary and the uniformity will be poor. Summary of the invention

[0004] The invention provides a device for crushing old asphalt materials, aiming to solve the problem of poor uniformity of particle size of products after crushing by crushing equipment in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a waste asphalt material crushing device, comprising:

[0006] A chassis, wherein the chassis has a accommodating cavity, the accommodating cavity is extended along the conveying direction of the material, a first feed inlet is provided at the top of the chassis, a first discharge port is provided at the bottom of the chassis, and the first discharge port corresponds to the first feed inlet in upper and lower directions;

[0007] A pre-screening component is arranged in the accommodating cavity, and the pre-screening component includes a transmission chain, a plurality of screen rods, and a first driving mechanism. The transmission chain is arranged horizontally and is in a closed waist shape. The transmission chain includes two parallel straight segments and two arc segments. The arc segment is connected between the two straight segments. The straight segment is parallel to the conveying direction of the material. A plurality of screen rods are arranged on the transmission chain at equal intervals. One end of the screen rod is connected to the transmission chain, and the other end of the screen rod extends outwardly to the outside of the transmission chain in a horizontal direction. When the screen rod moves to the straight segment adjacent to the first feed port, the screen rod is located below the first feed port, and is used to screen the fallen material. The first driving mechanism is arranged in the accommodating cavity, and is used to drive the transmission chain to move around its own waist-shaped contour.

[0008] A first conveying assembly, disposed below the first discharge port, for receiving materials dropped from the first discharge port; and

[0009] A multi-stage crushing component is arranged on the discharge side of the chassis, and is used to receive the material conveyed by the pre-screening component and crush the material.

[0010] In one possible implementation, a supporting groove is provided on the side wall of the accommodating cavity adjacent to the first feed port, and the supporting groove extends along the conveying direction of the material. When the screen rod moves to the straight section adjacent to the first feed port, the end of the screen rod is accommodated in the supporting groove.

[0011] In a possible implementation, a feed channel is provided above the first feed port, a material drop mechanism is provided in the feed channel, and the material drop mechanism includes:

[0012] Two arc-shaped plates are arranged opposite to the side walls of the feed channel, the upper ends of the two arc-shaped plates are respectively hinged to the side walls of the feed channel, and the lower ends of the two arc-shaped plates are movably connected to each other. When the lower ends of the two arc-shaped plates are matched, a semi-cylindrical material accommodating chamber can be formed; and

[0013] The second driving unit is arranged in the feeding channel and is used for driving the two arc-shaped plates to mate or open.

[0014] In a possible implementation, a cleaning port is provided on the side wall of the feed channel, and the cleaning port is located above the blanking mechanism. An anti-blocking mechanism is also provided above the blanking mechanism, and the anti-blocking mechanism includes:

[0015] A sieve plate is obliquely arranged in the feed channel, the sieve plate has mesh holes, and the lower end of the sieve plate is hinged to the side wall of the feed channel where the cleaning port is opened;

[0016] A third driving unit, provided in the feed channel, for driving the screen plate to rotate around its own rotation axis;

[0017] a blocking plate, disposed at the cleaning port; and

[0018] The fourth driving unit is arranged in the feeding channel and is used for driving the blocking plate to move up and down.

[0019] In a possible implementation, two pre-screening assemblies are provided from top to bottom, and the spacing between the screen bars of the pre-screening assembly located at the bottom is smaller than the spacing between the screen bars of the pre-screening assembly located at the top.

[0020] In a possible implementation, the multi-stage crushing assembly includes:

[0021] The housing comprises a first shell and a second shell arranged from top to bottom, the side wall of the first shell is provided with a second feed inlet, the side wall of the second shell is provided with a third feed inlet, and the bottom of the second shell is provided with a discharge port;

[0022] Two feed guides are respectively arranged at the second feed port and the third feed port, one end of the feed guide is connected with the corresponding second feed port or the third feed port, and the other end is formed with a receiving tray, the side of the receiving tray away from the shell is used to abut against the circular arc segment of the pre-screening component, and the bottom surface of the receiving tray is formed with a guide slope; when the screen rod moves to the circular arc segment, the screen rod is located above the receiving tray;

[0023] a primary crushing mechanism, disposed in the first shell, for crushing the material entering the first shell; and

[0024] The secondary crushing mechanism is arranged in the second shell and is used for crushing the materials entering the second shell.

[0025] In a possible implementation, the first shell is cylindrical, and the primary crushing mechanism includes:

[0026] A carrying plate, the carrying plate is arranged in the first shell and is located below the second feed port, and the outer periphery of the carrying plate is spaced a preset distance from the inner wall of the first shell to form a material drop space;

[0027] An extrusion block is disposed on the carrying plate, and the cross-sectional area of ​​the extrusion block gradually increases from top to bottom; and

[0028] The fifth driving unit is arranged in the first shell and is used to drive the extrusion block to rotate around a vertical axis. The output shaft of the fifth driving unit is connected to the extrusion block through an eccentric wheel transmission.

[0029] In a possible implementation, a plurality of protruding first extrusion teeth are provided on an outer peripheral wall of the extrusion block, and a plurality of protruding second extrusion teeth are provided on an inner wall of the first shell.

[0030] In a possible implementation, the secondary crushing mechanism includes:

[0031] Two crushing rollers are arranged opposite to each other in the second shell, a crushing gap is formed between the two crushing rollers, an inclined guide plate is provided below the third feed inlet, the guide plate is located above the crushing rollers and is used to guide the material to move toward the crushing gap; and

[0032] The sixth driving unit is arranged in the second shell and is used for driving the crushing roller to rotate around a horizontal axis.

[0033] In a possible implementation, the old asphalt material crushing device also includes a cooling component, which includes a plurality of nozzles arranged on the top of the chassis, and a pipe connected to the nozzles, and the nozzles are used to transport a cooling medium into the accommodating cavity, and the cooling medium is gaseous or liquid.

[0034] Compared with the prior art, the useful effects of the old asphalt crushing device provided by the present invention are:

[0035] The old asphalt material crushing device provided by the present invention comprises a chassis, a pre-screening component, a first conveying component and a multi-stage crushing component. A plurality of screen bars on the pre-screening component are arranged at equal intervals on the transmission chain. When the material to be crushed enters the containing chamber from the first feed port, the large volume (referring to the material to be crushed) of the material will fall onto the screen bar below, and be transported to the multi-stage crushing component through the running transmission chain, and the material will be crushed by the multi-stage crushing component. Small volume (referring to the material that does not need to be crushed) of the material falls onto the first conveying component below through the gap between the screen bars, and then is transported to other positions by the first conveying component. The advantages of such arrangement are: on the one hand, the material is preliminarily screened by pre-screening before entering the multi-stage crushing component, and the material that does not need to be crushed is removed to prevent it from being excessively crushed into powder, and the uniformity of the material after crushing is ensured. On the other hand, a plurality of screen bars arranged at equal intervals are used to screen the material. When the screen bars move with the transmission chain, the material can be transported from the first feed port to the multi-stage crushing component, which has both screening and conveying functions. On the other hand, due to the special structure composed of the transmission chain and the screen bars, when the screen bars reach the arc section, the distance between the screen bars will become larger, and the material can automatically fall from between the screen bars into the multi-stage crushing assembly, eliminating the operation of setting up the unloading assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A three-dimensional diagram of a waste asphalt crushing device provided by an embodiment of the present invention;

[0037] Figure 2 A three-dimensional diagram of a used asphalt material crushing device in a cross-sectional state provided by an embodiment of the present invention;

[0038] Figure 3 A plan view of a used asphalt crushing device in a cross-sectional state provided by an embodiment of the present invention;

[0039] Figure 4 It is a three-dimensional diagram of the chassis and the blanking mechanism in a cross-sectional state in an embodiment of the present invention;

[0040] Figure 5 for Figure 4 A partial enlarged view of the middle A part;

[0041] Figure 6A three-dimensional diagram of a pre-screening assembly and a multi-stage crushing assembly in an embodiment of the present invention;

[0042] Figure 7 The feed channel and the anti-blocking mechanism in the embodiment of the present invention are three-dimensional in cross-section. Figure 1 ;

[0043] Figure 8 The feed channel and the anti-blocking mechanism in the embodiment of the present invention are three-dimensional in cross-section. Figure 2 ;

[0044] Fig. 9 A three-dimensional diagram of a multi-stage crushing assembly in an embodiment of the present invention;

[0045] Fig.10 It is a three-dimensional diagram of a multi-stage crushing assembly in a cross-sectional state according to an embodiment of the present invention.

[0046] Description of reference numerals:

[0047] 10. Chassis; 11. First feed port; 12. First discharge port; 13. Supporting slot; 14. Feed channel; 141. Cleaning port; 15. Dropping mechanism; 151. Curved plate; 152. Second drive unit; 16. Anti-blocking mechanism; 161. Screen plate; 162. Third drive unit; 163. Blocking plate; 164. Fourth drive unit; 20. Pre-screening assembly; 21. Transmission chain; 211. Straight segment; 212. Circular segment; 22. Screen rod; 30. First conveying assembly; 40. Multi-stage crushing assembly; 41. External Shell; 411, first shell; 4111, second feed port; 4112, second extrusion tooth; 412, second shell; 4121, third feed port; 4122, discharge port; 4123, guide plate; 42, feed guide; 421, receiving tray; 43, primary crushing mechanism; 431, bearing plate; 432, extrusion block; 433, fifth drive unit; 434, eccentric wheel; 435, first extrusion tooth; 44, secondary crushing mechanism; 441, crushing roller; 442, sixth drive unit; 50, cooling component. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] It should be noted that when an element is referred to as being "fixed to", "fixed" or "fixedly disposed" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" or "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When an element is referred to as being "set to" or "disposed on" another element, it may be directly on the other element or there may be a central element. "Multiple" refers to two or more quantities. "At least one" refers to one or more quantities. "Several" refers to one or more quantities.

[0050] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0051] Please also read Figures 1 to 10 The following is an explanation of the old asphalt crushing device provided by the embodiment of the present invention. It can be understood that the old asphalt crushing device provided by the embodiment of the present invention can be used to crush other objects in addition to crushing old asphalt, and there is no limitation on this.

[0052] See also Figures 1 to 6 The embodiment of the present invention provides a waste asphalt material crushing device, including a chassis 10, a pre-screening component 20, a first conveying component 30 and a multi-stage crushing component 40. The chassis 10 has a accommodating chamber, and the accommodating chamber is extended along the conveying direction of the material. A first feed port 11 is provided at the top of the chassis 10, and a first discharge port 12 is provided at the bottom of the chassis 10. The first discharge port 12 corresponds to the first feed port 11 in upper and lower directions; the pre-screening component 20 is arranged in the accommodating chamber, and the pre-screening component 20 includes a transmission chain 21, a plurality of screen rods 22, and a first driving mechanism. The transmission chain 21 is horizontally arranged and is in a closed waist shape. The transmission chain 21 includes two parallel straight segments 211 and two circular arc segments 212. The circular arc segment 212 is connected between the two straight segments 211. The straight segment 211 is parallel to the conveying direction of the material. The plurality of screen rods 22 are evenly spaced and arranged on the transmission. The moving chain 21, one end of the screen rod 22 is connected to the transmission chain 21, and the other end of the screen rod 22 extends outward in the horizontal direction to the outside of the transmission chain 21; when the screen rod 22 moves to the straight section 211 adjacent to the first feed port 11, the screen rod 22 is located below the first feed port 11, and is used to screen the fallen materials. The first driving mechanism is arranged in the accommodating cavity, and is used to drive the transmission chain 21 to move around its own waist-shaped contour; the first conveying assembly 30 is arranged below the first discharge port 12, and is used to receive the materials dropped from the first discharge port 12; the multi-stage crushing assembly 40 is arranged on the discharge side of the chassis 10, and the multi-stage crushing assembly 40 is used to receive the materials conveyed by the pre-screening assembly 20 and crush the materials.

[0053] Compared with the prior art, the useful effects of the old asphalt crushing device provided by the embodiment of the present invention are:

[0054] The old asphalt material crushing device provided in the embodiment of the present invention includes a chassis 10, a pre-screening component 20, a first conveying component 30 and a multi-stage crushing component 40. The pre-screening component 20 has a plurality of screen bars 22 arranged at equal intervals on the transmission chain 21. When the material to be crushed enters the accommodating chamber from the first feed port 11, the large volume (referring to the material to be crushed) of the material will fall onto the screen bar 22 below, and be transported to the multi-stage crushing component 40 through the running transmission chain 21, and the material will be crushed by the multi-stage crushing component 40. The small volume (referring to the material that does not need to be crushed) of the material falls onto the first conveying component 30 below through the gaps between the screen bars 22, and then is transported to other locations by the first conveying component 30.

[0055] The advantages of setting the pre-screening component 20 in the embodiment of the present invention are as follows: on the one hand, the material is preliminarily screened through pre-screening before entering the multi-stage crushing component 40, and the material that does not need to be crushed (referring to the old asphalt material) is removed to prevent it from being over-crushed into powder, thereby ensuring the uniformity of the material after crushing. On the other hand, a plurality of sieve rods 22 arranged at equal intervals are used to screen the material. When the sieve rods 22 move with the transmission chain 21, the material can be transported from the first feed port 11 to the multi-stage crushing component 40, which has both the screening and transportation functions. On the other hand, the special structure composed of the transmission chain 21 and the sieve rods 22, when the sieve rods 22 reach the arc section 212, the spacing between the sieve rods 22 will become larger, and the material can automatically fall from between the sieve rods 22 into the multi-stage crushing component 40, eliminating the operation of setting the unloading component. Compared with conventional screening devices such as vibrating screens, there is no risk of blockage.

[0056] The top of the chassis 10 has a first feed port 11, and the bottom has a first discharge port 12. The old asphalt material to be crushed can be put into the first feed port 11 by an excavator, a forklift, etc. After being screened by the pre-screening component 20, the large volume of material is transported to the multi-stage crushing component 40 for multiple crushing. Small volume of material leaks from the gap between the screen bars 22 and falls onto the first conveying component 30 below, and then is transported to a designated location by the first conveying component 30. The first conveying component 30 can be a common conveying equipment such as a belt conveyor and a screw feeder.

[0057] One or more pre-screening components 20 can be provided as needed. When multiple pre-screening components 20 are provided, the multiple pre-screening components 20 are spaced from top to bottom, and the screening gap decreases successively, so that the material can be divided into multiple levels according to volume from large to small.

[0058] The pre-screening assembly 20 is composed of a transmission chain 21, a screen rod 22 and a first driving mechanism. The transmission chain 21 can be a closed ring-shaped chain, a chain plate, etc. The first driving mechanism, such as a motor, a hydraulic motor, etc., can drive the transmission chain 21 to run through a transmission member such as a sprocket. A screen rod 22 is provided on each link of the transmission chain 21. The screen rod 22 is used to screen the material dropped from the first feed port 11. The screen rod 22 is usually a stainless steel rod with a circular cross section, which has a certain structural strength and is not easy to deform or rust after long-term use.

[0059] Optionally, the spacing between adjacent screen bars 22 may be 50 mm, 70 mm, 100 mm, etc., which may be specifically set according to the volume of the material to be crushed.

[0060] like Figure 6 As shown, the transmission chain 21 has two straight segments 211 and two arc segments 212. In the straight segment 211, the spacing of the screen bars 22 does not change, and the material is transported to the multi-stage crushing assembly 40 as the transmission chain 21 runs. After reaching the multi-stage crushing assembly 40, the material is transported to the arc segment 212, and the spacing of the screen bars 22 located in the arc segment 212 becomes larger, so that the material can fall into the feeding structure of the multi-stage crushing assembly 40. The multi-stage crushing assembly 40 is provided with one, two or more levels of crushing mechanisms from top to bottom, and the crushing gap of the multi-stage crushing mechanism decreases step by step from top to bottom.

[0061] Each pre-screening assembly 20 has a corresponding crushing mechanism. For large-volume materials, feeding from the top can be crushed in one, two or more stages. For medium-volume materials, feeding from the middle can be crushed in two stages. Materials of different volumes are fed from different positions to ensure that the final materials have the same volume and high uniformity.

[0062] See also Figure 4 and Figure 5 In some possible embodiments, a supporting groove 13 is provided on the side wall of the accommodating cavity adjacent to the first feed port 11, and the supporting groove 13 extends along the conveying direction of the material. When the screen rod 22 moves to the straight section 211 adjacent to the first feed port 11, the end of the screen rod 22 is accommodated in the supporting groove 13. In this way, one end of the screen rod 22 is supported by the transmission chain 21, and the other end is supported by the inner wall of the supporting groove 13, ensuring that the screen rod 22 has sufficient load-bearing capacity and can withstand the impact of falling materials without deformation.

[0063] See also Figures 2 to 5In some possible embodiments, a feed channel 14 is provided above the first feed port 11, and a material drop mechanism 15 is provided in the feed channel 14, and the material drop mechanism 15 includes two arc plates 151 and a second drive unit 152. The two arc plates 151 are relatively arranged on the side walls of the feed channel 14, the upper ends of the two arc plates 151 are respectively hinged to the side walls of the feed channel 14, and the lower ends of the two arc plates 151 are movably connected to each other. When the lower ends of the two arc plates 151 are aligned, the two arc plates 151 and the side walls of the feed channel 14 can form a semi-cylindrical material accommodating cavity; the second drive unit 152 is provided in the feed channel 14, and is used to drive the two arc plates 151 to be aligned or opened.

[0064] When materials are delivered by a forklift, excavator or other equipment, since the delivery is intermittent, it is necessary to return to the material pile to retrieve the materials again after the delivery is completed. In this case, in order to prevent the materials from falling too much at one time and accumulating on the pre-screening component 20, affecting the normal operation of the equipment, the materials will first enter the material accommodating cavity of the material dropping mechanism 15, and then the material dropping mechanism 15 will control the materials to continue dropping at a certain material dropping speed.

[0065] In this embodiment, the material dropping mechanism 15 is composed of two arc plates 151 and a second drive unit 152. The two arc plates 151 are first in a matched state. When the forklift completes the delivery of the old asphalt material, the second drive unit 152 controls the two arc plates 151 to slowly open, so that the material continues to fall from the lower opening into the accommodating cavity. By reasonably controlling the opening of the arc plates 151, the effect of approximately uniform material dropping can be achieved, ensuring that the old asphalt crushing device can operate continuously and stably. The second drive unit 152 can be a rotary power device such as a reduction motor and a hydraulic rotary motor.

[0066] See also Figure 7 and Figure 8 In some possible embodiments, a cleaning port 141 is provided on the side wall of the feed channel 14, and the cleaning port 141 is located above the blanking mechanism 15. An anti-blocking mechanism 16 is also provided above the blanking mechanism 15, and the anti-blocking mechanism 16 includes a sieve plate 161, a third driving unit 162, a blocking plate 163, and a fourth driving unit 164. The sieve plate 161 is tiltedly arranged in the feed channel 14, and the sieve plate 161 has meshes. The lower end of the sieve plate 161 is hinged to the side wall of the feed channel 14 with the cleaning port 141, and the cleaning port 141 is higher than the lower end of the sieve plate 161; the third driving unit 162 is arranged in the feed channel 14, and is used to drive the sieve plate 161 to rotate around its own rotation axis; the blocking plate 163 is arranged at the cleaning port 141; and the fourth driving unit 164 is arranged in the feed channel 14, and is used to drive the blocking plate 163 to move up and down.

[0067] In this embodiment, the anti-blocking mechanism 16 is used to perform preliminary screening on the materials put in by the forklift to prevent the materials exceeding the set volume from entering. When the materials of too large volume are put into the feed channel 14, they will be blocked by the inclined sieve plate 161, and then the fourth drive unit 164 drives the blocking plate 163 to rise, and the cleaning port 141 is opened, and the materials can be discharged from the cleaning port 141 along the inclined sieve plate 161. When the materials cannot be discharged smoothly, the third drive unit 162 can also drive the sieve plate 161 to rotate, and the sieve plate 161 can push the materials when rotating, so that they are discharged from the cleaning port 141. After the materials are discharged from the cleaning port 141, the fourth drive unit 164 drives the blocking plate 163 to close the cleaning port 141 again.

[0068] See also Figure 6 In some possible embodiments, two pre-screening components 20 are provided from top to bottom, and the spacing between the screen bars 22 of the lower pre-screening component 20 is smaller than the spacing between the screen bars 22 of the upper pre-screening component 20, so that the material can be screened twice, thereby obtaining materials of three volume specifications: large, medium and small. The large-volume material is located on the upper pre-screening component 20, and is fed from the upper part of the multi-stage crushing component 40, and is successively crushed in the first and second stages. The medium-volume material is located on the lower pre-screening component 20, and is fed from the middle part of the multi-stage crushing component 40, and is only crushed in the second stage. The small-volume material falls from the middle of the screen bar 22 and falls onto the first conveying component 30 below. It does not need to be crushed and is conveyed to the designated position by the first conveying component 30.

[0069] See also Figure 2 , Figure 6 , Fig. 9 and Fig.10 In some possible embodiments, the multi-stage crushing assembly 40 includes a shell 41, two feed guides 42, a primary crushing mechanism 43 and a secondary crushing mechanism 44. The shell 41 includes a first shell 411 and a second shell 412 arranged from top to bottom, the side wall of the first shell 411 is provided with a second feed port 4111, the side wall of the second shell 412 is provided with a third feed port 4121, and the bottom of the second shell 412 is provided with a discharge port 4122; the two feed guides 42 are respectively provided at the second feed port 4111 and the third feed port 4121, one end of the feed guide 42 is connected to the corresponding second feed port 4111 or the third feed port 4121, and the other end is formed with a receiving tray 421.

[0070] The side of the receiving tray 421 away from the outer shell 41 is used to abut against the arc segment 212 of the pre-screening component 20, and a material guiding slope is formed on the bottom surface of the receiving tray 421; when the screen rod 22 moves to the arc segment 212, the screen rod 22 is located above the receiving tray 421; the primary crushing mechanism 43 is arranged in the first shell 411, and is used to crush the material entering the first shell 411; the secondary crushing mechanism 44 is arranged in the second shell 412, and is used to crush the material entering the second shell 412.

[0071] In this embodiment, the primary crushing mechanism 43 and the secondary crushing mechanism 44 are used to crush materials at different levels. The crushing particle size of the primary crushing mechanism 43 is relatively large, and the crushing particle size of the secondary crushing mechanism 44 is relatively small. Large-volume materials are first crushed by the primary crushing mechanism 43, and then further crushed by the secondary crushing mechanism 44. Medium-volume materials can be directly crushed by the secondary crushing mechanism 44. Such a setting can effectively avoid the problem of excessive crushing resulting in too small material particles or even powder, and the crushed materials have high uniformity and higher recycling value.

[0072] In order to enable the material on the pre-screening component 20 to be smoothly transferred to the multi-stage crushing component 40, a feed guide 42 is provided at the second feed port 4111 and the third feed port 4121. The feed guide 42 has an arc-shaped groove adapted to the arc segment 212 on the side in contact with the pre-screening component 20. When the screen rods 22 reach the arc segment 212, the spacing between the screen rods 22 increases, and the material falls to the feed guide 42 below, and then slides along the guide slope into the multi-stage crushing component 40.

[0073] It is understandable that, in order to ensure that all the materials fall into the feed guide 42, a material blocking plate can be provided above the arc segment 212 to block the materials in the arc segment 212 from continuing to move with the screen bar 22 to the next straight segment 211. Whether the material blocking plate is provided can be determined based on whether the materials can smoothly fall from the screen bar 22 of the arc segment 212 during actual use.

[0074] See also Figure 2 , Figure 6 , Fig. 9 and Fig.10In some possible embodiments, the first shell 411 is cylindrical, and the primary crushing mechanism 43 includes a bearing plate 431, an extrusion block 432, and a fifth driving unit 433. The bearing plate 431 is arranged in the first shell 411 and is located below the second feed port 4111. The outer periphery of the bearing plate 431 is spaced from the inner wall of the first shell 411 by a preset distance to form a material drop space; the extrusion block 432 is arranged on the bearing plate 431, and the cross-sectional area of ​​the extrusion block 432 gradually increases from top to bottom, and the extrusion block 432 is conical or approximately conical; the fifth driving unit 433 is arranged in the first shell 411, and is used to drive the extrusion block 432 to rotate around a vertical axis. The output shaft of the fifth driving unit 433 is connected to the extrusion block 432 through an eccentric wheel 434. The moving path of the extrusion block 432 is circular. The extrusion block 432 is connected to the eccentric wheel 434 in rotation. While moving along a circular trajectory, it can also rotate around its own axis.

[0075] In the prior art, when a common roller crushing structure crushes a large-volume material, the volume of the material is larger than the gap between the two rollers. The large-volume material is not easy to enter the gap between the two rollers, and the crushing efficiency is low.

[0076] Compared with the common roller crushing structure, the extrusion crushing mechanism provided in this embodiment is more suitable for crushing large-volume materials. After the large-volume material enters the first shell 411 from the second feed port 4111, it falls into the space enclosed by the extrusion block 432 and the side wall of the first shell 411. The fifth driving unit 433 drives the extrusion block 432 to move. Since the extrusion block 432 is set on the eccentric wheel 434, the moving path of the extrusion block 432 is circular, which can crush the material. The crushed material falls from the falling space between the bearing plate 431 and the first shell 411 into the second shell 412 for secondary crushing.

[0077] Please refer to 2. Figure 6 , Fig. 9 and Fig.10 In some possible embodiments, the outer peripheral wall of the extrusion block 432 is provided with a plurality of protruding first extrusion teeth 435, and the inner wall of the first shell 411 is provided with a plurality of protruding second extrusion teeth 4112. Both the first extrusion teeth 435 and the second extrusion teeth 4112 are made of wear-resistant materials, which can improve the extrusion crushing effect.

[0078] See 2 and Fig.10In some possible embodiments, the secondary crushing mechanism 44 includes a crushing roller 441 and a sixth driving unit 442. The two crushing rollers 441 are arranged opposite to each other in the second housing 412, and a crushing gap is formed between the two crushing rollers 441. An inclined guide plate 4123 is arranged below the third feed port 4121, and the guide plate 4123 is located above the crushing rollers 441 to guide the material to move to the crushing gap; the sixth driving unit 442, such as a reduction motor, a hydraulic motor, etc., is arranged in the second housing 412 to drive the crushing rollers 441 to rotate around a horizontal axis.

[0079] Please refer to 2. Figure 6 , Fig. 9 and Fig.10 In some possible embodiments, the old asphalt crushing device further includes a cooling component 50, which includes a plurality of nozzles disposed on the top of the chassis 10 and a pipe connected to the nozzles. The nozzles are used to transport a cooling medium into the accommodating cavity, and the cooling medium is in a gaseous or liquid state. The cooling medium can be liquid nitrogen, water, compressed air, etc. The temperature of the cooling medium should be lower than the ambient temperature, and the old asphalt in the chassis 10 can be cooled. On the one hand, the old asphalt is crushed better at low temperatures, and on the other hand, it can also prevent the old asphalt from softening and adhering to the surfaces of the screen rod 22, the crushing roller 441 and other structures in hot weather, which increases the cleaning work.

[0080] It can be understood that the various parts in the above-mentioned embodiments can be freely combined or deleted to form different combination embodiments. The specific contents of each combination embodiment will not be repeated here. After this description, it can be considered that the specification of the present invention has recorded various combination embodiments and can support different combination embodiments.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for crushing old asphalt, characterized in that: include: A chassis (10), the chassis (10) having a accommodating cavity, the accommodating cavity extending along the conveying direction of the material, a first material inlet (11) being provided at the top of the chassis (10), a first material outlet (12) being provided at the bottom of the chassis (10), the first material outlet (12) and the first material inlet (11) corresponding to each other in the upper and lower parts; A pre-screening component (20) is arranged in the accommodating chamber, the pre-screening component (20) comprises a transmission chain (21), a plurality of screen bars (22), and a first driving mechanism, the transmission chain (21) is arranged horizontally and is in a closed waist shape, the transmission chain (21) comprises two parallel straight segments (211) and two arc segments (212), the arc segment (212) is connected between the two straight segments (211), the straight segment (211) is parallel to the conveying direction of the material, and the plurality of screen bars (22) are arranged at equal intervals. The transmission chain (21), one end of the sieve rod (22) is connected to the transmission chain (21), and the other end of the sieve rod (22) extends outwardly in a horizontal direction to the outside of the transmission chain (21); when the sieve rod (22) moves to the straight section (211) adjacent to the first feed port (11), the sieve rod (22) is located below the first feed port (11) for screening the fallen materials, and the first driving mechanism is arranged in the accommodating cavity for driving the transmission chain (21) to move around its waist-shaped contour; a first conveying assembly (30), disposed below the first discharge port (12), and used to receive materials dropped from the first discharge port (12); and A multi-stage crushing component (40) is arranged on the material discharge side of the machine box (10), and the multi-stage crushing component (40) is used to receive the material conveyed by the pre-screening component (20) and crush the material.

2. The old asphalt crushing device according to claim 1, characterized in that: A supporting groove (13) is provided on a side wall of the accommodating cavity adjacent to the first feed opening (11), and the supporting groove (13) extends along the conveying direction of the material. When the sieve rod (22) moves to the straight section (211) adjacent to the first feed opening (11), the end of the sieve rod (22) is accommodated in the supporting groove (13).

3. The old asphalt crushing device according to claim 1, characterized in that: A feeding channel (14) is provided above the first feeding port (11), and a material dropping mechanism (15) is provided in the feeding channel (14). The material dropping mechanism (15) comprises: Two arc-shaped plates (151) are arranged opposite to the side wall of the feed channel (14), the upper ends of the two arc-shaped plates (151) are respectively hinged to the side wall of the feed channel (14), and the lower ends of the two arc-shaped plates (151) are movably connected to each other, and when the lower ends of the two arc-shaped plates (151) are matched, a semi-cylindrical material accommodating chamber can be formed; and The second driving unit (152) is provided in the feeding channel (14) and is used to drive the two arc-shaped plates (151) to mate with or open each other.

4. The old asphalt crushing device according to claim 3, characterized in that: A cleaning port (141) is provided on the side wall of the feed channel (14). The cleaning port (141) is located above the blanking mechanism (15). An anti-blocking mechanism (16) is also provided above the blanking mechanism (15). The anti-blocking mechanism (16) comprises: a sieve plate (161) disposed obliquely in the feed channel (14), the sieve plate (161) having mesh holes, and a lower end of the sieve plate (161) being hinged to a side wall of the feed channel (14) having the cleaning port (141); A third driving unit (162), provided in the feed channel (14), and used for driving the screen plate (161) to rotate around its own rotation axis; A blocking plate (163) is disposed at the cleaning port (141); and A fourth driving unit (164) is provided in the feed channel (14) and is used to drive the blocking plate (163) to move up and down.

5. The old asphalt crushing device according to claim 1, characterized in that: The pre-screening components (20) are provided with two from top to bottom, and the spacing between the screen bars (22) of the pre-screening component (20) located at the bottom is smaller than the spacing between the screen bars (22) of the pre-screening component (20) located at the top.

6. The old asphalt crushing device according to claim 1, characterized in that: The multi-stage crushing assembly (40) comprises: The housing (41) comprises a first shell (411) and a second shell (412) arranged from top to bottom, the side wall of the first shell (411) being provided with a second feed inlet (4111), the side wall of the second shell (412) being provided with a third feed inlet (4121), and the bottom of the second shell (412) being provided with a discharge port (4122); Two feed guides (42) are respectively arranged at the second feed port (4111) and the third feed port (4121); one end of the feed guide (42) is connected to the corresponding second feed port (4111) or the third feed port (4121); the other end is formed with a receiving tray (421); a side of the receiving tray (421) away from the housing (41) is used to abut against the circular arc segment (212) of the pre-screening component (20); a material guiding slope is formed on the bottom surface of the receiving tray (421); when the sieve rod (22) moves to the circular arc segment (212), the sieve rod (22) is located above the receiving tray (421); a primary crushing mechanism (43), disposed in the first shell (411), and used for crushing materials entering the first shell (411); and The secondary crushing mechanism (44) is disposed in the second shell (412) and is used to crush materials entering the second shell (412).

7. The old asphalt crushing device according to claim 6, characterized in that: The first shell (411) is cylindrical, and the primary crushing mechanism (43) comprises: A carrying plate (431), the carrying plate (431) being arranged in the first shell (411) and located below the second feed port (4111), the outer periphery of the carrying plate (431) being spaced a preset distance from the inner wall of the first shell (411) to form a material dropping space; An extrusion block (432) is disposed on the bearing plate (431), and the cross-sectional area of ​​the extrusion block (432) gradually increases from top to bottom; and The fifth driving unit (433) is provided on the first housing (411) and is used to drive the extrusion block (432) to rotate around a vertical axis. The output shaft of the fifth driving unit (433) is connected to the extrusion block (432) via an eccentric wheel (434).

8. The old asphalt crushing device according to claim 7, characterized in that: The outer peripheral wall of the extrusion block (432) is provided with a plurality of protruding first extrusion teeth (435), and the inner wall of the first shell (411) is provided with a plurality of protruding second extrusion teeth (4112).

9. The old asphalt crushing device according to claim 6, characterized in that: The secondary crushing mechanism (44) comprises: Two crushing rollers (441) are arranged opposite to each other in the second shell (412), a crushing gap is formed between the two crushing rollers (441), an inclined guide plate (4123) is provided below the third feed opening (4121), the guide plate (4123) is located above the crushing rollers (441) and is used to guide the material to move toward the crushing gap; and The sixth driving unit (442) is provided in the second shell (412) and is used to drive the crushing roller (441) to rotate around a horizontal axis.

10. The old asphalt crushing device according to claim 1, characterized in that: The old asphalt crushing device also includes a cooling component (50), the cooling component (50) including a plurality of nozzles arranged on the top of the chassis (10), and pipes connected to the nozzles, the nozzles are used to transport a cooling medium into the accommodating cavity, and the cooling medium is in a gaseous state or a liquid state.

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