A device for crushing and recycling waste concrete from bridge expansion

Abstract

This invention provides a crushing and recycling device for waste concrete from bridge expansion projects, applicable to the field of concrete crushing. The device includes a crushing and recycling mechanism comprising a coarse crushing unit, a fine crushing stationary unit, a dustproof unit, and a fine crushing moving unit. The coarse crushing unit includes a lifting ring frame with a coarse crushing hydraulic rod. The fine crushing stationary unit is equipped with an impact unit, and the fine crushing moving unit has a fine crushing cone ring plate on its inner side. A fine crushing stationary ring plate is fixed inside the fine crushing stationary unit. A dustproof unit is fixed at the bottom of the fine crushing stationary unit. This invention, through the cooperation of the coarse crushing unit, the fine crushing stationary unit, and the fine crushing moving unit, achieves graded crushing of waste concrete piles from bridges. The coarse crushing hydraulic rod and the impact unit enable separate coarse and fine crushing of the waste piles, improving crushing efficiency and rapidly crushing the waste concrete into particles of different sizes for automatic sorting and recycling.

Description

Technical Field

[0001] This application relates to the field of concrete crushing, and in particular to a device for crushing and recycling waste concrete from bridge expansion projects. Background Technology

[0002] In bridge expansion projects, a large number of abandoned concrete piles need to be disposed of. Traditional methods often involve directly burying or dumping these piles in the open, which not only occupies a large amount of land resources but also pollutes the environment (such as soil and groundwater pollution). Furthermore, abandoned concrete contains a significant amount of recyclable materials (such as recycled aggregates), and directly discarding it results in a tremendous waste of resources.

[0003] Existing crushing and recycling equipment for bridge waste concrete piles suffers from low crushing efficiency, uneven particle size distribution, and severe dust pollution, failing to meet the demands for efficient and environmentally friendly waste concrete treatment. Furthermore, during the crushing process, fine and coarse materials within the waste concrete piles cannot be effectively separated, further impacting the effectiveness and efficiency of the crushing and recycling process. Therefore, there is an urgent need for a new crushing and recycling system for waste concrete from expanded bridges that can achieve efficient crushing, effective separation of fine and coarse materials, and reduced dust pollution. Summary of the Invention

[0004] The purpose of this application is to solve the technical problems of low crushing efficiency, uneven crushing particle size, and serious dust pollution in existing concrete crushing and recycling devices. Compared with the prior art, this application provides a crushing and recycling device for waste concrete in bridge expansion, including a crushing and recycling mechanism suspended at the bottom of an excavator by a hoisting rope. The crushing and recycling mechanism is used to be sleeved on the waste piles of the bridge and to perform crushing and recycling operations from top to bottom. The crushing and recycling mechanism includes a coarse crushing unit, a fine crushing fixed unit, a dust prevention unit, and a fine crushing moving unit. The coarse crushing unit includes a lifting ring frame, on which a plurality of coarse crushing hydraulic rods are evenly fixed at equal angles.

[0005] The fine crushing stationary unit is fixed to the bottom of the lifting ring frame. The fine crushing moving unit is slidably connected to the inner side of the fine crushing stationary unit in the vertical direction. The fine crushing stationary unit is provided with several impact units for driving the fine crushing moving unit to move back and forth as a whole. The inner side of the fine crushing moving unit is provided with a fine crushing cone ring plate. The fine crushing stationary unit is fixed with a fine crushing stationary ring plate that cooperates with the fine crushing cone ring plate. The fine crushing stationary unit is provided with a feed inlet and a coarse material discharge outlet at the top and bottom between the fine crushing cone ring plate and the fine crushing stationary ring plate, respectively.

[0006] A dustproof unit is fixed at the bottom of the fine crushing unit, which is used to seal the gap between the crushing and recycling mechanism and the bottom of the abandoned bridge pile.

[0007] Furthermore, each of the output ends of the coarse crushing hydraulic rod is fixed with a crushing head, and the output axis of the coarse crushing hydraulic rod is inclined upward.

[0008] The excavator is also equipped with hydraulic shears, which are used to cut the reinforcing bars in abandoned bridge piles. The top of the lifting ring is fixed with lifting lugs for connecting the lifting rope.

[0009] Furthermore, the top of the hanging ring frame is also provided with several atomizing nozzles evenly distributed at equal angles. The input end of the atomizing nozzle is connected to an external water supply unit through a pipe, and the output direction of the atomizing nozzle is tilted upward.

[0010] Furthermore, the fine crushing unit includes an outer ring cover fixed to the bottom of the lifting ring frame, a ring seat is fixed to the inner top of the outer ring cover, a flow divider is fixed to the bottom of the outer ring cover, and the fine crushing ring plate is fixed between the ring seat and the flow divider.

[0011] A conical rubber sleeve is also fixed to the top of the fine crushing ring plate.

[0012] Furthermore, the outer wall of the fine crushing ring plate is hemispherical, and a number of longitudinal crushing strips are fixed on the outer wall of the fine crushing ring plate, with guide grooves provided between adjacent longitudinal crushing strips.

[0013] The flow divider plate has several fine material discharge ports evenly spaced at equal angles at the bottom of the flow guide channel. The inner side of the flow divider plate is fixedly connected to the bottom of the fine crushing ring plate. A guide cone plate is also fixed to the outer side of the flow divider plate. A flow divider protrusion ring is provided at the top of the guide cone plate. Several partitions evenly spaced at equal angles are fixed between the outer ring cover and the flow divider plate. The coarse material discharge port is located between adjacent partitions.

[0014] Furthermore, a number of partition plates 2 are fixed between the top of the ring seat 1 and the fine crushing fixed ring plate, and the feed port is located between adjacent partition plates 2.

[0015] Furthermore, the fine crushing cone ring plate is generally in the form of a cone-shaped ring structure, and the middle part of the fine crushing cone ring plate is tangential to the middle part of the longitudinal crushing bar. The longitudinal crushing bar and the fine crushing cone ring plate are respectively provided with fine crushing tooth two and fine crushing tooth one at the tangential position.

[0016] The fine crushing unit also includes a ring seat three for fixing the fine crushing cone ring plate. The top of the ring seat three is provided with a limiting ring. Several return springs are fixed between the limiting ring and the outer ring cover. The return springs have an elastic force that drives the fine crushing unit as a whole to move upward away from the fine crushing stationary unit.

[0017] Furthermore, the top of the ring seat three is also provided with several counter-impact columns that match the impact unit. The impact unit includes an impact cylinder body fixed in the fine crushing unit. An impact piston rod is slidably connected in the impact cylinder body. The impact cylinder body is also provided with a nitrogen chamber at the top of the impact piston rod. The impact cylinder body is provided with an impact oil chamber and a return oil chamber on the circumferential side of the impact piston rod. A piston structure that cooperates with the impact oil chamber and the return oil chamber is fixed on the impact cylinder body.

[0018] Furthermore, the dustproof unit includes a ring seat two fixed to the bottom of the diversion plate, an annular airbag fixed on the inner side of the ring seat two, and a drain outlet on the inner side of the annular airbag corresponding to the abandoned bridge pile. The annular airbag is connected to an external air supply unit through a pipe.

[0019] Compared to existing technologies, the advantages of this application are:

[0020] This invention achieves graded crushing of waste concrete piles from bridges through the coordination of coarse crushing unit, fine crushing stationary unit, and fine crushing moving unit. The coarse crushing hydraulic rod and impact unit enable separate coarse and fine crushing of waste piles, improving crushing efficiency and rapidly breaking waste concrete into particles of different sizes for automatic sorting and recycling. The dual dustproof design of the annular airbag of the dustproof unit and the atomizing nozzle on the top of the lifting ring effectively reduces dust generated during the crushing process, minimizing harm to the environment and operators, and meeting environmental protection requirements. Attached Figure Description

[0021] Figure 1 This is a schematic diagram illustrating the overall usage status of this application;

[0022] Figure 2 This is a side view of the crushing and recycling mechanism proposed in this application;

[0023] Figure 3 This is a schematic diagram of the top structure of the crushing and recycling mechanism proposed in this application;

[0024] Figure 4 This is a schematic diagram of the bottom structure of the crushing and recycling mechanism proposed in this application;

[0025] Figure 5 This is a schematic diagram of the exploded structure of the crushing and recycling mechanism proposed in this application;

[0026] Figure 6 This is a cross-sectional structural diagram of the fine crushing unit proposed in this application;

[0027] Figure 7 This is a schematic cross-sectional view of the fine breaking unit proposed in this application;

[0028] Figure 8 for Figure 7 Enlarged structural diagram of section A in the middle;

[0029] Figure 9 This is a cross-sectional structural diagram of the dustproof unit proposed in this application;

[0030] Figure 10 This is a cross-sectional structural diagram of the crushing and recycling mechanism proposed in this application;

[0031] Figure 11 for Figure 10 Enlarged structural diagram of section B in the middle;

[0032] Figure 12 This is a schematic diagram illustrating the separation direction of coarse and fine materials as presented in this application.

[0033] Explanation of the labels in the diagram:

[0034] 1. Crushing and recycling mechanism; 11. Coarse crushing unit; 111. Atomizing nozzle; 112. Lifting lug; 113. Lifting ring frame; 12. Fine crushing stationary unit; 121. Coarse material discharge port; 1211. Partition plate one; 122. Feed port; 123. Outer ring cover; 124. Ring seat one; 1241. Partition plate two; 125. Return spring; 126. Conical rubber sleeve; 127. Diverter plate; 1271. Diverter convex ring; 1272. Fine material discharge port; 1273. Guide cone plate; 13. Dustproof unit; 131. Annular airbag; 132. Drain outlet; 133. Ring seat two; 14. Fine crushing moving unit; 141. Ring seat three; 142. Counter-impact column; 143. Limiting ring; 144. Fine crushing cone ring plate; 1441. Fine crushing tooth one;

[0035] 2. Excavator; 21. Hydraulic shears;

[0036] 3. Suspension rope;

[0037] 4. Abandoned bridge piles; 41. Reinforcing steel bars;

[0038] 5. Coarse crushing hydraulic rod; 51. Crushing head;

[0039] 6. Impact unit; 61. Impact cylinder block; 62. Nitrogen chamber; 63. Impact oil chamber; 64. Return oil chamber; 65. Impact piston rod;

[0040] 7. Fine crushing ring plate; 71. Longitudinal crushing bar; 711. Fine crushing tooth 2; 72. Guide groove. Detailed Implementation

[0041] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application. Example

[0042] This invention provides a device for crushing and recycling waste concrete from bridge expansion projects. Please refer to [link / reference]. Figures 1-12 It includes a crushing and recycling mechanism 1 suspended at the bottom of the excavator 2 by a hoisting rope 3. The crushing and recycling mechanism 1 is used to be sleeved on the abandoned bridge pile 4 and to carry out crushing and recycling operations from top to bottom. The crushing and recycling mechanism 1 includes a coarse crushing unit 11, a fine crushing fixed unit 12, a dust prevention unit 13 and a fine crushing moving unit 14.

[0043] For details, please refer to Figures 1-4 The coarse crushing unit 11 includes a lifting ring frame 113. Several coarse crushing hydraulic rods 5 are evenly fixed on the lifting ring frame 113 at equal angles. Each output end of the coarse crushing hydraulic rod 5 is fixed with a crushing head 51. The output axis of the coarse crushing hydraulic rod 5 is inclined upward, so that the crushing head 51 can apply force to the surface of the abandoned bridge pile 4 at an inclined angle when working. Compared with vertical action, it is easier to crush the concrete and improve the coarse crushing efficiency. At the same time, a conical top is formed on the top of the abandoned bridge pile 4 after coarse crushing, which facilitates the automatic falling of large pieces of concrete after coarse crushing.

[0044] Please see Figure 1 The excavator 2 is also equipped with a hydraulic shear 21, which is used to cut the steel bars 41 in the abandoned bridge piles 4, gradually reducing the height of the steel bars 41, so as to facilitate the subsequent crushing and recycling of concrete. The top of the lifting ring frame 113 is fixed with a lifting lug 112 for connecting the lifting rope 3, so as to facilitate the hoisting of the crushing and recycling mechanism 1 onto the excavator 2.

[0045] Please see Figures 4-10 The fine crushing stationary unit 12 is fixed to the bottom of the lifting ring frame 113. The fine crushing moving unit 14 is slidably connected to the inner side of the fine crushing stationary unit 12 in the vertical direction. The fine crushing stationary unit 12 is provided with a number of impact units 6 for driving the fine crushing moving unit 14 to move back and forth as a whole. The inner side of the fine crushing moving unit 14 is provided with a fine crushing cone ring plate 144. The fine crushing stationary unit 12 is fixed with a fine crushing stationary ring plate 7 that cooperates with the fine crushing cone ring plate 144.

[0046] The fine crushing unit 12 has a feed inlet 122 and a coarse material discharge outlet 121 at the top and bottom between the fine crushing cone ring plate 144 and the fine crushing ring plate 7, respectively. Specifically, the fine crushing unit 12 includes an outer ring cover 123 fixed to the bottom of the hanging ring frame 113. A ring seat 124 is fixed to the inner side of the top of the outer ring cover 123, and a diverter plate 127 is fixed to the bottom of the outer ring cover 123. The fine crushing ring plate 7 is fixed between the ring seat 124 and the diverter plate 127. A conical rubber sleeve 126 is also fixed to the top of the fine crushing ring plate 7. The conical rubber sleeve 126 can play a certain buffering and guiding role for the concrete blocks entering the feed inlet 122.

[0047] The outer wall of the fine crushing ring plate 7 is hemispherical, and several longitudinal crushing bars 71 are fixed on its outer wall. A guide groove 72 is provided between adjacent longitudinal crushing bars 71. The diversion plate 127 has several fine material discharge ports 1272 that are evenly distributed at equal angles at the bottom of the guide groove 72. The inner side of the diversion plate 127 is fixedly connected to the bottom of the fine crushing ring plate 7. A guide cone plate 1273 is also fixed on the outer side of the diversion plate 127. A diversion convex ring 1271 is provided on the top of the guide cone plate 1273. Several partition plates 1211 are evenly distributed at equal angles between the outer ring cover 123 and the diversion plate 127. The coarse material discharge port 121 is located between adjacent partition plates 1211. Several partition plates 1241 are evenly distributed at equal angles between the ring seat 124 and the top of the fine crushing ring plate 7. The feed port 122 is located between adjacent partition plates 1241.

[0048] Please see Figure 6 The fine crushing cone ring plate 144 of the fine crushing unit 14 has an overall cone-shaped ring structure. The middle part of the fine crushing cone ring plate 144 is tangential to the middle part of the longitudinal crushing bar 71. The longitudinal crushing bar 71 and the fine crushing cone ring plate 144 are respectively provided with fine crushing tooth 2 711 and fine crushing tooth 1441 at the tangent position. Fine crushing tooth 1441 and fine crushing tooth 2 711 bite and squeeze each other to achieve fine crushing of concrete blocks.

[0049] The fine crushing unit 14 also includes a ring seat 141 for fixing the fine crushing cone ring plate 144. The top of the ring seat 141 is provided with a limiting ring 143. Several return springs 125 are fixed between the limiting ring 143 and the outer ring cover 123. The return springs 125 have an elastic force to drive the fine crushing unit 14 to move upward away from the fine crushing fixed unit 12. The top of the ring seat 141 is also provided with several counter-impact pins 142 that match the impact unit 6. The working principle of the impact unit 6 is similar to that of the hydraulic breaker in the prior art. Specifically, the impact unit 6 includes an impact pin fixed in the fine crushing fixed unit 12. The cylinder body 61 has an impact piston rod 65 that is slidably connected within it. The impact cylinder body 61 also has a nitrogen chamber 62 at the top of the impact piston rod 65. The impact cylinder body 61 has an impact oil chamber 63 and a return oil chamber 64 on the circumferential side of the impact piston rod 65. The impact cylinder body 61 is fixed with piston structures that cooperate with the impact oil chamber 63 and the return oil chamber 64. By controlling the oil pressure changes in the impact oil chamber 63 and the return oil chamber 64, the impact piston rod 65 is driven to move. In conjunction with the compression and release of nitrogen in the nitrogen chamber 62, the fine crushing unit 14 is driven to reciprocate and impact.

[0050] The dustproof unit 13 is fixed to the bottom of the fine crushing unit 12 and is used to seal the bottom gap between the crushing and recycling mechanism 1 and the bridge abandoned pile 4. The dustproof unit 13 includes a ring seat 133 fixed to the bottom of the diversion plate 127. An annular airbag 131 is fixed on the inner side of the ring seat 133. The annular airbag 131 is also provided with a drain outlet 132 on the inner side corresponding to the bridge abandoned pile 4. The annular airbag 131 is connected to an external air supply unit through a pipe. The external air supply unit inflates the annular airbag 131 to expand and seal the gap. The drain outlet 132 can drain the water generated during the crushing process. At the same time, the design of the annular airbag 131 and the conical rubber sleeve 126 allows the crushing and recycling mechanism 1 to be used on bridge abandoned piles 4 of different diameters, improving its applicability.

[0051] In addition, the top of the lifting ring 113 is provided with several atomizing nozzles 111 evenly distributed at equal angles. The input end of the atomizing nozzle 111 is connected to an external water supply unit through a pipe. The output direction of the atomizing nozzle 111 is tilted upward. The atomizing nozzles 111 spray to form a water curtain, which blocks the dust from moving upward during crushing. At the same time, the sprayed atomized water can combine with the dust generated during the crushing process, causing it to settle, further reducing dust pollution during the crushing process.

[0052] During operation, the crushing and recycling mechanism 1 is hoisted to the bottom of the excavator 2 using the hoisting rope 3, and then the crushing and recycling mechanism 1 is attached to the abandoned bridge pile 4. First, the hydraulic shears 21 on the excavator 2 are used to cut the steel bars 41 inside the abandoned bridge pile 4, providing space for the crushing and recycling mechanism 1 to move down, which facilitates subsequent crushing. Then, the coarse crushing hydraulic rod 5 is activated, which drives the crushing head 51 to perform oblique coarse crushing on the abandoned bridge pile 4, initially crushing the abandoned pile into larger concrete blocks. The coarsely crushed concrete blocks enter the fine crushing stationary unit 12 and the fine crushing moving unit 14 through the feed inlet 122. The working time of the impact unit 6 is from when the crushing head 51 contacts the outer wall of the abandoned bridge pile 4 until the crushing head 51 pressurizes the abandoned bridge pile 4 to the critical crushing point. At this time, the crushing head 51 clamps the abandoned bridge pile 4 to provide stable support for the bottom fine crushing stationary unit 12 and the fine crushing moving unit 14.

[0053] When the impact unit 6 is working, when oil enters the impact oil chamber 63, the oil pressure pushes the impact piston rod 65 downward, and the impact piston rod 65 pushes the counter-impact column 142. This, in conjunction with the nitrogen gas in the nitrogen chamber 62, releases potential energy, thereby driving the fine crushing unit 14 to move downward in the vertical direction. When oil enters the return oil chamber 64, the impact piston rod 65 moves upward and compresses nitrogen gas in the nitrogen chamber 62 to store energy. With the assistance of the spring force of the return spring 125, the fine crushing unit 14 moves upward, and this process repeats. The fine crushing cone ring plate 144 of the fine crushing unit 14 and the fine crushing teeth on the fine crushing stationary ring plate 7 of the fine crushing stationary unit 12 cooperate with each other to further crush the coarsely crushed concrete blocks.

[0054] During the fine crushing process, finer concrete particles are discharged through the guide channel 72 and the fine material discharge port 1272; coarser concrete particles are discharged through the coarse material discharge port 121. Simultaneously, the annular airbag 131 of the dust suppression unit 13 expands after being inflated by the external air supply unit, sealing the bottom gap between the crushing and recycling mechanism 1 and the abandoned bridge pile 4, reducing dust leakage. The atomizing nozzle 111 at the top of the hanging ring frame 113 sprays atomized water, further suppressing dust and achieving environmentally friendly crushing. The atomized water, after falling, enters the fine material discharge port through the guide channel 72. The material is discharged through the discharge port 1272 and mixed with fine materials, falling into the top of the annular airbag 131. At this time, the atomized water will gradually wet the unbroken part of the bridge waste pile 4. After the bridge waste pile 4 is wetted, the water will penetrate into the micro-cracks and pores inside the material, weakening the bonding force between aggregates such as gravel and sand and cement paste, reducing the overall structural strength, and making it easier to be crushed by the crushing and recycling mechanism 1, reducing the energy consumption and time required for crushing. At the same time, the water will also fall to the surface of the bridge waste pile 4 through the drain port 132 for pre-concrete pre-wetting.

[0055] When the crushing and recycling mechanism 1 moves downward, the fine material accumulated on the annular airbag 131 automatically falls under gravity when the annular airbag 131 retracts. At the same time, since the fine material is wet, it will not cause dust pollution when falling. Meanwhile, the design of the guide cone plate 1273 makes the falling range of coarse and fine materials form a concentric ring, thereby achieving the purpose of automatic classification and recycling.

[0056] This invention achieves graded crushing of bridge waste concrete piles through the cooperation of coarse crushing unit 11, fine crushing stationary unit 12, and fine crushing moving unit 14. The coarse crushing hydraulic rod 5 and impact unit 6 can perform coarse and fine crushing of waste piles respectively, improving crushing efficiency and enabling waste concrete to be quickly crushed into particles of different sizes for automatic classification and recycling. The dual dustproof design of the annular airbag 131 of the dustproof unit 13 and the atomizing nozzle 111 on the top of the hanging ring frame 113 can effectively reduce the dust generated during the crushing process, reduce the harm to the environment and operators, and meet environmental protection requirements.

[0057] The above description is only the best implementation method adopted in this application in combination with current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. A device for crushing and recycling waste concrete from bridge expansion, comprising a crushing and recycling mechanism (1) suspended at the bottom of an excavator (2) by a hoisting rope (3), the crushing and recycling mechanism (1) being fitted onto a waste pile (4) of the bridge and performing a top-down crushing and recycling operation, characterized in that, The crushing and recycling mechanism (1) includes a coarse crushing unit (11), a fine crushing fixed unit (12), a dust prevention unit (13) and a fine crushing moving unit (14). The coarse crushing unit (11) includes a lifting ring frame (113), and several coarse crushing hydraulic rods (5) are evenly fixed on the lifting ring frame (113) at equal angles. The fine crushing stationary unit (12) is fixed at the bottom of the lifting ring frame (113). The fine crushing moving unit (14) is slidably connected to the inner side of the fine crushing stationary unit (12) in the vertical direction. The fine crushing stationary unit (12) is provided with several impact units (6) for driving the fine crushing moving unit (14) to move back and forth as a whole. The fine crushing moving unit (14) is provided with a fine crushing cone ring plate (144) on the inner side. The fine crushing stationary unit (12) is fixed with a fine crushing stationary ring plate (7) that cooperates with the fine crushing cone ring plate (144). The fine crushing stationary unit (12) is provided with a feed inlet (122) and a coarse material discharge outlet (121) at the top and bottom between the fine crushing cone ring plate (144) and the fine crushing stationary ring plate (7), respectively. The bottom of the fine crushing unit (12) is fixed with a dustproof unit (13), which is used to seal the bottom gap between the crushing and recycling mechanism (1) and the bridge abandoned pile (4). The fine crushing unit (12) includes an outer ring cover (123) fixed to the bottom of the lifting ring frame (113), a ring seat (124) is fixed to the inner side of the top of the outer ring cover (123), a flow divider plate (127) is fixed to the bottom of the outer ring cover (123), and the fine crushing ring plate (7) is fixed between the ring seat (124) and the flow divider plate (127). The top of the fine-breaking ring plate (7) is also fixed with a conical rubber sleeve (126). The outer wall of the fine crushing ring plate (7) is hemispherical, and a number of longitudinal crushing strips (71) are fixed on the outer wall of the fine crushing ring plate (7). A guide groove (72) is provided between adjacent longitudinal crushing strips (71). The diversion plate (127) has several fine material discharge ports (1272) evenly distributed at equal angles at the bottom of the guide channel (72). The inner side of the diversion plate (127) is fixedly connected to the bottom of the fine crushing ring plate (7). The outer side of the diversion plate (127) is also fixed with a guide cone plate (1273). The top of the guide cone plate (1273) is provided with a diversion convex ring (1271). Several partition plates (1211) evenly distributed at equal angles are fixed between the outer ring cover (123) and the diversion plate (127). The coarse material discharge port (121) is located between adjacent partition plates (1211). The fine crushing cone ring plate (144) has a cone-shaped ring structure. The middle part of the fine crushing cone ring plate (144) is tangential to the middle part of the longitudinal crushing bar (71). The longitudinal crushing bar (71) and the fine crushing cone ring plate (144) are respectively provided with fine crushing tooth two (711) and fine crushing tooth one (1441) at the tangential position. The fine crushing unit (14) also includes a ring seat three (141) for fixing the fine crushing cone ring plate (144). The top of the ring seat three (141) is provided with a limiting ring (143). A plurality of return springs (125) are fixed between the limiting ring (143) and the outer ring cover (123). The return springs (125) have an elastic force that drives the fine crushing unit (14) to move upward away from the fine crushing fixed unit (12).

2. The waste concrete crushing and recycling device for bridge expansion as described in claim 1, characterized in that, The output end of the coarse crushing hydraulic rod (5) is fixed with a crushing head (51), and the output axis of the coarse crushing hydraulic rod (5) is inclined upward. The excavator (2) is also equipped with a hydraulic shear (21), which is used to cut the steel bars (41) in the abandoned piles (4) of the bridge. The top of the lifting ring frame (113) is fixed with a lifting lug (112) for connecting the lifting rope (3).

3. The waste concrete crushing and recycling device for bridge expansion as described in claim 1, characterized in that, The top of the hanging ring frame (113) is also provided with several atomizing nozzles (111) evenly distributed at equal angles. The input end of the atomizing nozzle (111) is connected to an external water supply unit through a pipe, and the output direction of the atomizing nozzle (111) is tilted upward.

4. The waste concrete crushing and recycling device for bridge expansion as described in claim 1, characterized in that, A number of partition plates (1241) are fixed between the top of the ring seat (124) and the fine crushing ring plate (7), and the feed inlet (122) is located between adjacent partition plates (1241).

5. The waste concrete crushing and recycling device for bridge expansion according to claim 1, characterized in that, The top of the ring seat three (141) is also provided with several counter-impact columns (142) that match the impact unit (6). The impact unit (6) includes an impact cylinder (61) fixed in the fine breaking unit (12). An impact piston rod (65) is slidably connected in the impact cylinder (61). The impact cylinder (61) is also provided with a nitrogen chamber (62) at the top of the impact piston rod (65). The impact cylinder (61) is provided with an impact oil chamber (63) and a return oil chamber (64) on the circumferential side of the impact piston rod (65). A piston structure that cooperates with the impact oil chamber (63) and the return oil chamber (64) is fixed on the impact cylinder (61).

6. The waste concrete crushing and recycling device for bridge expansion according to claim 1, characterized in that, The dustproof unit (13) includes a ring seat two (133) fixed at the bottom of the diversion plate (127). An annular airbag (131) is fixed on the inner side of the ring seat two (133). The annular airbag (131) is also provided with a drain outlet (132) on the inner side corresponding to the abandoned pile (4) of the bridge. The annular airbag (131) is connected to an external air supply unit through a pipe.

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