A shredder for recycled concrete

Abstract

This invention relates to the field of concrete crushing technology. This application discloses a crusher for recycled concrete, including a conveying pipe, a guide plate at the top of the conveying pipe, an annular side plate fixedly installed on the outer surface of the guide plate, a conical top plate fixedly installed on the top of the annular side plate, a second screening hole at the top of the conical top plate arranged in a circular array, and a stop cone fixedly installed at the bottom of the annular side plate. When the concrete blocks that have undergone initial crushing are poured into the second feed cylinder, these concrete blocks, mixed with relatively fine concrete debris, enter the area above the guide plate through the second screening hole at the top of the conical top plate, and slide into the interior of the conveying pipe under the action of the inclined surface. Subsequently, at the top of the stop cone plate, the concrete debris generated after the initial crushing is separated from the larger concrete blocks, preventing concrete debris from entering the crushing chamber and affecting the crushing efficiency of the concrete blocks, thus improving the reliability of the device.

Description

Technical Field

[0001] This application relates to the field of concrete crushing technology, and more particularly to a crusher for recycled concrete. Background Technology

[0002] When recycled concrete is reused, a crusher is used to break down large concrete blocks into concrete fragments, which are then processed to form recycled concrete for reuse. This method greatly reduces production costs and eliminates a large amount of construction waste. A concrete crusher published in CN108212416B uses a combination of crushing and grinding protrusions to crush concrete, improving production efficiency. However, it still has certain limitations in practical use. For example, the device lacks internal screening equipment, resulting in both crushed and uncrushed concrete being swept out by the baffle and into the coarse material discharge device, causing waste. Furthermore, if the coarse material needs to be crushed again, manual transfer is required, which is time-consuming and labor-intensive, affecting production efficiency. Therefore, this application proposes a crusher for recycled concrete to solve the aforementioned problems. Summary of the Invention

[0003] This application proposes a crusher for recycled concrete, which has the advantage of being able to further crush incompletely crushed concrete blocks within the crushing chamber, thereby solving the problem of waste caused by the discharge of coarse materials.

[0004] To achieve the above objectives, this application adopts the following technical solution: it includes a shell, a baffle shell is fixedly installed on the outer surface of the shell near the top, a first feed cylinder is provided on the top of the shell, a second feed cylinder is provided on the top of the first feed cylinder, and a first screening hole is provided on the outer surface of the shell. Concrete debris that has been crushed and reached a suitable volume will enter the cavity between the shell and the baffle shell through the first screening hole on the surface of the shell.

[0005] Specifically, a discharge hole is provided on the outer surface of the housing below the first screening hole. A spring slide rail is provided on the outer surface of the housing outside the discharge hole. A baffle is movably installed inside the spring slide rail via a spring shaft connection. A first connecting rod is fixedly installed at the bottom of the inner wall of the spring slide rail. A central shaft seat is fixedly installed at one end of the first connecting rod. A stroke device is fixedly installed at the bottom of the central shaft seat. A crushing device is movably installed on the outer surface of the stroke device. A support frame is provided on the outer surface of the baffle housing. A discharge device is placed below the housing.

[0006] Furthermore, the first screening holes are distributed in a rectangular array, and the discharge holes are distributed in a ring array.

[0007] Furthermore, the travel device includes a power chamber, inside which a rotary motor is fixedly installed. A telescopic mechanism is fixedly installed at one end of the output shaft of the rotary motor, and a discharge cone plate is fixedly installed at one end of the output shaft of the telescopic mechanism. The top of the discharge cone plate is also provided with a conical surface, so that concrete debris continues to slide down and pass through the opening between the discharge cone plate and the travel sleeve, as well as the opening between the housing and the central shaft seat, and finally falls onto the discharge equipment.

[0008] Specifically, a second connecting rod is fixedly installed on the outer surface of the discharge cone plate, a stroke sleeve is fixedly installed at one end of the second connecting rod, a connecting slider is fixedly installed on the outer surface of the stroke sleeve near the middle, an annular plate is fixedly installed on the outer surface of the connecting slider, an annular hole is opened at the top of the annular plate, and a baffle rod is provided inside the annular hole;

[0009] Specifically, a protrusion is provided on the back of the baffle near the bottom, which passes through the discharge hole and contacts the bottom surface of the annular plate.

[0010] Furthermore, the baffle rods are distributed in a ring array. The cross-sectional shape of the baffle rods is equilateral triangle with the tip pointing directly downwards. The gap between adjacent baffle rods is limited, allowing only small concrete debris to pass through and enter the cavity between the ring plate and the ring base. Larger concrete blocks, however, cannot pass through the baffle rods and remain on top of them.

[0011] Furthermore, the crushing device includes a crushing cylinder, an annular base is provided on the outer surface of the crushing cylinder, an annular base is fixedly installed on the outer surface of the crushing cylinder near the bottom, and an impact plate is movably installed on the top of the annular base. Under the obstruction of centrifugal force and the impact plate, concrete debris in the cavity between the annular plate and the annular base is thrown out and enters the cavity between the shell and the baffle shell through the open discharge hole, and falls to the top of the discharge device under the action of gravity.

[0012] Specifically, as the stop bar moves downward, it pushes the impact plate to rotate to the right, causing the impact plate to tilt. At the same time, the impact plate extends out from the gap between the stop bars and is positioned above the annular plate.

[0013] Specifically, a stroke hole is provided on the outer surface of the crushing cylinder above the annular base, an inclined surface is provided on the top of the crushing cylinder, and a top hole is provided near the center of the top. A connecting seat is provided in the inner cavity of the crushing cylinder near the top, a spring rod is fixedly installed at the bottom of the connecting seat, and a sliding connecting seat is movably installed on the outer surface of the spring rod.

[0014] Specifically, the stroke hole is in movable engagement with the connecting slider.

[0015] Furthermore, the inner ring of the sliding connecting seat is movably fitted with a conveying pipe through a bearing engagement. The material enters above the guide plate through the second screening hole at the top of the conical top plate and slides into the interior of the conveying pipe under the action of the inclined surface. The top of the conveying pipe is provided with a guide plate, and an annular side plate is fixedly installed on the outer surface of the guide plate. A conical top plate is fixedly installed on the top of the annular side plate, and a second screening hole is opened at the top of the conical top plate. A stop cone is fixedly installed at the bottom of the annular side plate.

[0016] Furthermore, the impact plates are distributed in a ring array, and the impact plates are movably sleeved with the ring base using a spring shaft. Initially, the impact plates are in a vertical state. The conveying pipe extends into the interior of the crushing cylinder through the top hole. The second screening holes are distributed in a ring array, and the bottom of the stop cone is in contact with the top hole of the crushing cylinder.

[0017] Furthermore, the top of the impact plate is provided with an inclined surface, and the impact plate is located slightly to the right below the stop bar.

[0018] This application has the following beneficial effects.

[0019] During the feeding process, the device can directly expose and discharge concrete debris. However, large-volume concrete debris may enter the crushing chamber along with the main concrete, affecting the crushing effect. During the crushing process, the baffle bar can perform secondary screening of the crushed concrete, allowing only appropriately sized concrete debris to pass through. Under the action of centrifugal force, the debris is discharged through the outlet hole, while larger concrete debris remains at the top of the baffle bar and cannot be discharged. When a large amount of concrete blocks accumulate at the top of the baffle bar, the telescopic conveyor moves the annular plate downward, causing the inclined impact plate to collide with the accumulated concrete blocks and bounce them up, so that they collide with the crushing seat again and are crushed until they are discharged through the baffle bar and the outlet hole. As the annular plate moves downward, the volume of the cavity between the first feed cylinder and the stop cone cylinder decreases, and the feeding stops, preventing the falling concrete blocks from colliding with the concrete blocks bounced up by the impact plate, which would lead to reduced crushing efficiency. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0021] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0022] Figure 1 This is a structural diagram of the present invention;

[0023] Figure 2 This is a cross-sectional view of the main structure of the present invention;

[0024] Figure 3 This is a structural diagram of the shell of the present invention;

[0025] Figure 4 This is a cross-sectional view of the shell structure of the present invention;

[0026] Figure 5 This is a diagram of the structural travel device of the present invention;

[0027] Figure 6 This is a cross-sectional view of the structural travel device of the present invention;

[0028] Figure 7 This is a structural diagram of the crushing cylinder of the present invention;

[0029] Figure 8 This is a cross-sectional view of the crushing cylinder structure of the present invention;

[0030] Figure 9 This is a structural diagram of the feed cylinder of the present invention;

[0031] Figure 10 This is a cross-sectional view of the feed cylinder structure of the present invention;

[0032] Figure 11 This is a diagram showing the combination of the crushing cylinder and the feed guide cylinder of the present invention;

[0033] Figure 12 This is a cross-sectional view of the combination of the crushing cylinder and the feed cylinder of the present invention.

[0034] In the diagram: 1. Housing; 2. Material retaining shell; 3. First feed cylinder; 4. Second feed cylinder; 5. First screening hole; 6. Discharge hole; 7. Spring slide rail; 8. Baffle plate; 9. First connecting rod; 10. Central shaft seat; 11. Stroke device; 111. Power chamber; 112. Rotary motor; 113. Telescopic mechanism; 114. Discharge cone plate; 115. Second connecting rod; 116. Stroke sleeve; 117. Connecting slider; 118. Annular plate; 119. 12. Material stop bar; 12. Crushing device; 121. Crushing cylinder; 122. Crushing seat; 123. Annular base; 124. Impact plate; 125. Stroke hole; 126. Top hole; 127. Connecting seat; 128. Spring rod; 129. Sliding connecting seat; 130. Conveying pipe; 131. Guide plate; 132. Annular side plate; 133. Conical top plate; 134. Second screening hole; 135. Stop cone; 13. Support frame; 14. Discharge equipment. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0036] A crusher for recycled concrete, please refer to [link / reference]. Figures 1-4 The device includes a housing 1, a baffle shell 2 fixedly installed on the outer surface of the housing 1 near the top, a first feed cylinder 3 at the top of the housing 1, a second feed cylinder 4 at the top of the first feed cylinder 3, a first screening hole 5 on the outer surface of the housing 1, a discharge hole 6 below the first screening hole 5 on the outer surface of the housing 1, a spring slide rail 7 outside the discharge hole 6 on the outer surface of the housing 1, a baffle 8 movably installed inside the spring slide rail 7 via a spring shaft connection, a first connecting rod 9 fixedly installed at the bottom of the inner wall of the spring slide rail 7, a central shaft seat 10 fixedly installed at one end of the first connecting rod 9, a stroke device 11 fixedly installed at the bottom of the central shaft seat 10, a crushing device 12 movably installed on the outer surface of the stroke device 11, a support frame 13 on the outer surface of the baffle shell 2, and a discharge device 14 placed below the housing 1.

[0037] Please see Figures 2-3 The first screening holes 5 are distributed in a rectangular array, and the discharge holes 6 are distributed in a ring array.

[0038] Please see Figures 5-6 The stroke device 11 includes a power chamber 111, in which a rotary motor 112 is fixedly installed. A telescopic mechanism 113 is fixedly installed at one end of the output shaft of the rotary motor 112. A discharge cone plate 114 is fixedly installed at one end of the output shaft of the telescopic mechanism 113. A second connecting rod 115 is fixedly installed on the outer surface of the discharge cone plate 114. A stroke sleeve 116 is fixedly installed at one end of the second connecting rod 115. A connecting slider 117 is fixedly installed on the outer surface of the stroke sleeve 116 near the middle. An annular plate 118 is fixedly installed on the outer surface of the connecting slider 117. An annular hole is opened at the top of the annular plate 118, and a baffle rod 119 is provided inside the annular hole.

[0039] Please see Figure 4 and Figure 6 A protrusion is provided on the back of the baffle 8 near the bottom, which passes through the discharge hole 6 and contacts the bottom surface of the annular plate 118.

[0040] Please see Figure 5 The baffle rods 119 are arranged in a ring array, and the cross-sectional shape of the baffle rods 119 is an equilateral triangle with the tip pointing directly downwards.

[0041] Please see Figures 7-8 The crushing device 12 includes a crushing cylinder 121, an annular base 123 on the outer surface of the crushing cylinder 121, an annular base 123 fixedly installed on the outer surface of the crushing cylinder 121 near the bottom, an impact plate 124 movably installed on the top of the annular base 123, a stroke hole 125 opened on the outer surface of the crushing cylinder 121 above the annular base 123, an inclined surface on the top of the crushing cylinder 121, and a top hole 126 opened on the top near the center, a connecting seat 127 is provided in the inner cavity of the crushing cylinder 121 near the top, a spring rod 128 is fixedly installed on the bottom of the connecting seat 127, and a sliding connecting seat 129 is movably installed on the outer surface of the spring rod 128;

[0042] Please see Figures 6-7 The stroke hole 125 is in active fit with the connecting slider 117.

[0043] Please see Figures 9-10 The inner ring of the sliding connecting seat 129 is movably fitted with a conveying pipe 130 through bearing engagement. A guide plate 131 is provided on the top of the conveying pipe 130. An annular side plate 132 is fixedly installed on the outer surface of the guide plate 131. A conical top plate 133 is fixedly installed on the top of the annular side plate 132. A second screening hole 134 is opened on the top of the conical top plate 133. A stop cone 135 is fixedly installed on the bottom of the annular side plate 132.

[0044] Please see Figures 7-12 The impact plates 124 are arranged in a ring array. The impact plates 124 are movably sleeved with the ring base 123 by spring shaft. The impact plates 124 are initially in a vertical state. The conveying pipe 130 extends into the interior of the crushing cylinder 121 through the top hole 126. The second screening holes 134 are arranged in a ring array. The bottom of the stop cone 135 is in contact with the top hole 126 of the crushing cylinder 121.

[0045] Please see Figure 5 and Figure 7 The top of the impact plate 124 is provided with a slope, and the impact plate 124 is located directly below and slightly to the right of the stop bar 119.

[0046] In this process, when the pre-crushed concrete blocks are poured onto the conical top plate 133 via a conveyor, the top of the conical top plate 133 is conical, and the concrete blocks slide down under the action of gravity. The concrete blocks contain relatively fine concrete debris, which meets the crushing requirements. This debris enters the guide plate 131 through the second screening hole 134 at the top of the conical top plate 133, and slides into the inside of the conveying pipe 130 under the action of the inclined surface. Then, at the top of the discharge cone plate 114, which also has a conical surface, the concrete debris continues to slide down and pass through the opening between the discharge cone plate 114 and the stroke sleeve 116, as well as the opening between the housing 1 and the central shaft seat 10, and finally falls onto the discharge device 14. This process separates the concrete debris generated after the initial crushing from the larger concrete blocks, preventing the concrete debris from entering the crushing chamber and affecting the crushing efficiency of the concrete blocks, thus improving the reliability of the device.

[0047] The concrete blocks entering the cavity between the housing 1 and the crushing cylinder 121 will collide with and be crushed by the crushing seat 122. The crushed concrete fragments that have reached a suitable size will enter the cavity between the housing 1 and the baffle shell 2 through the first screening hole 5 on the surface of the housing 1, and fall onto the top of the discharge device 14 through the bottom opening, realizing the first step of separation of the crushed concrete fragments. The remaining concrete fragments will continue to fall under the action of gravity and fall above the baffle rod 119. Since the baffle rod 119 is distributed in a ring array, the gap between adjacent baffle rods 119 is limited, allowing only small concrete fragments to pass through and enter the ring plate 118 and the ring bottom. In the cavity between the base 123, larger concrete blocks cannot pass through the baffle rod 119 and remain above it. At this time, the stroke device 11 and the crushing device 12 are only rotating. Under the obstruction of centrifugal force and impact plate 124, the concrete debris in the cavity between the annular plate 118 and the annular base 123 is thrown out and enters the cavity between the housing 1 and the baffle shell 2 through the open discharge hole 6. Under the action of gravity, it falls to the top of the discharge device 14, thereby achieving secondary separation. This avoids the problem in the comparative document where large concrete blocks and small concrete debris are swept into the coarse material discharge device together, causing a reduction in production efficiency, and provides the reliability of the device.

[0048] When a large number of large concrete blocks accumulate on top of the baffle rod 119, the telescopic conveyor 113 retracts and drives the travel sleeve 116 and the baffle rod 119 to move downwards simultaneously. Because the top of the impact plate 124 is sloped and located slightly to the right below the baffle rod 119, the baffle rod 119's downward movement pushes the impact plate 124 to rotate to the right, causing it to tilt. Simultaneously, the impact plate 124 extends from the gap between the baffle rods 119 and is positioned above the annular plate 118. At this time, the travel device 11... During the rotation of the crushing device 12, the inclined impact plate 124 will collide with the concrete block pushed above the baffle bar 119, thereby bouncing the concrete block up and causing it to collide with the crushing seat 122 again for secondary crushing to form debris. This method not only avoids the problem of incompletely crushed concrete blocks accumulating on the top of the baffle bar 119 and causing blockage, but also improves the production efficiency of the device. It avoids the problems of waste and inconvenience caused by directly discharging coarse material through the coarse material discharge device as mentioned in the comparative document, thus improving the practicality of the device.

[0049] During the downward movement of the telescopic conveyor 113, the connecting slider 117 moves downward synchronously with the stroke sleeve 116. Through the movable cooperation between the connecting slider 117 and the stroke hole 125, the crushing cylinder 121 moves downward as a whole during the downward movement. Since the crushing cylinder 121 and the stop cone 135 are connected by the spring rod 128 and the sliding connecting seat 129, the crushing cylinder 121 will drag the stop cone 135 downward under the elastic force of the spring rod 128 during the downward movement. This reduces the distance between the outer surface of the stop cone 135 and the inner wall of the first feed cylinder 3, preventing the concrete blocks from passing through the cavity between the stop cone 135 and the first feed cylinder 3, thus stopping the feeding. This avoids the problem that the impact plate 124 will bounce up the accumulated concrete blocks and collide with the concrete blocks that have entered the crushing chamber through the feeding, preventing them from properly impacting the crushing seat 122. This improves the stability of the device during operation.

[0050] When the annular plate 118 and the travel sleeve 116 move down synchronously, a protrusion is provided on the back of the baffle 8 near the bottom. This protrusion passes through the discharge hole 6 and contacts the bottom surface of the annular plate 118. As the annular plate 118 moves down, it pushes the baffle 8 to move down synchronously and closes the discharge hole 6. This prevents large concrete blocks from falling through the discharge hole 6 to the top of the discharge device 14, causing mixing and affecting product quality. After the annular plate 118 is lifted, the elastic force stored in the spring slide rail 7 will drive the baffle 8 to reset synchronously, so that the discharge hole 6 reopens and allows concrete debris to pass through, improving the practicality and automation of the device.

[0051] The method of using this invention is as follows:

[0052] The initially crushed concrete fragments are fed into the second feed cylinder 4 through the top. Due to the conical top plate 133's conical surface, the concrete fragments slide down under gravity. These fragments, containing finer concrete particles, meet the crushing requirements and enter the guide plate 131 through the second screening hole 134 at the top of the conical top plate 133. They then slide down the inclined surface into the conveying pipe 130. Subsequently, at the top of the discharge cone plate 114, which also has a conical surface, the concrete fragments continue to slide down and pass through the openings between the discharge cone plate 114 and the travel sleeve 116, as well as the openings between the housing 1 and the central shaft seat 10, finally falling onto the discharge device 14. This process effectively removes the crushed concrete fragments from the feed cylinder. After the initial crushing, the concrete debris separated from the larger concrete blocks enters the cavity between the housing 1 and the crushing cylinder 121. This debris collides with and is crushed by the crushing seat 122. The crushed concrete debris, now of suitable size, enters the cavity between the housing 1 and the baffle shell 2 through the first screening hole 5 on the surface of the housing 1, and falls through the bottom opening onto the top of the discharge device 14. This completes the first step of separation of the crushed concrete debris. The remaining concrete debris continues to fall under gravity and lands above the baffle rods 119. Because the baffle rods 119 are arranged in a ring array, the gaps between adjacent baffle rods 119 are limited, allowing only small concrete debris to pass through. The concrete fragments enter the cavity between the annular plate 118 and the annular base 123. Larger concrete blocks cannot pass through the baffle rod 119 and remain above it. At this point, with the travel device 11 and the crushing device 12 only rotating, the concrete debris in the cavity between the annular plate 118 and the annular base 123 is thrown out by centrifugal force and the obstruction of the impact plate 124. It then enters the cavity between the housing 1 and the baffle shell 2 through the open discharge hole 6 and falls to the top of the discharge device 14 under gravity, thus achieving secondary separation. When a large number of large concrete blocks accumulate on top of the baffle rod 119, the telescopic conveyor 113 retracts and drives the travel sleeve 116 and the baffle rod 119 to move downwards synchronously. Due to the impact plate... The top of the impact plate 124 is provided with an inclined surface, and the impact plate 124 is located directly below and slightly to the right of the baffle rod 119. This causes the baffle rod 119 to move downwards, pushing the impact plate 124 to rotate to the right, thus tilting the impact plate 124. Simultaneously, the impact plate 124 extends from the gap between the baffle rods 119 and is positioned above the annular plate 118. During the rotation of the travel device 11 and the crushing device 12, the tilted impact plate 124 collides with the concrete block pushed above the baffle rod 119, causing the concrete block to bounce up and collide again with the crushing seat 122 for secondary crushing into debris. As the telescopic conveyor 113 moves downwards, the connecting slider 117 moves downwards synchronously with the travel sleeve 116.By connecting the slider 117 and the stroke hole 125 in a movable fit, the slider 117 will drive the entire crushing cylinder 121 to move downwards during its downward movement. Since the crushing cylinder 121 and the stop cone 135 are connected by a spring rod 128 and a sliding connecting seat 129, the crushing cylinder 121 will drag the stop cone 135 downwards under the elastic force of the spring rod 128 during its downward movement. This reduces the distance between the outer surface of the stop cone 135 and the inner wall of the first feed cylinder 3, preventing concrete blocks from passing through the cavity between the stop cone 135 and the first feed cylinder 3, thus stopping the feeding. When the annular plate... After the annular plate 118 and the travel sleeve 116 move down synchronously, a protrusion is provided on the back of the baffle 8 near the bottom. This protrusion passes through the discharge hole 6 and contacts the bottom surface of the annular plate 118. As the annular plate 118 moves down, it pushes the baffle 8 down synchronously, closing the discharge hole 6. This prevents large concrete blocks from falling through the discharge hole 6 to the top of the discharge device 14, causing mixing and affecting product quality. Furthermore, after the annular plate 118 is lifted, the spring force stored in the spring slide rail 7 will cause the baffle 8 to reset synchronously, reopening the discharge hole 6 and allowing concrete debris to pass through.

Claims

1. A crusher for recycled concrete, characterized in that, The device includes a housing, with a baffle shell fixedly installed on the outer surface of the housing near the top. A first feed cylinder is located at the top of the housing, and a second feed cylinder is located above the first feed cylinder. A first screening hole is provided on the outer surface of the housing, and a discharge hole is opened on the outer surface of the housing below the first screening hole. A spring slide rail is provided on the outer surface of the housing outside the discharge hole. A baffle plate is movably installed inside the spring slide rail via a spring shaft connection. A first connecting rod is fixedly installed at the bottom of the inner wall of the spring slide rail, and a central shaft seat is fixedly installed at one end of the first connecting rod. A stroke device is fixedly installed at the bottom of the central shaft seat. A crushing device is movably installed on the outer surface of the stroke device. A support frame is provided on the outer surface of the material blocking shell. A discharge device is placed below the shell. The stroke device includes a power chamber. A rotary motor is fixedly installed inside the power chamber. A telescopic mechanism is fixedly installed at one end of the output shaft of the rotary motor. A discharge cone is fixedly installed at one end of the output shaft of the telescopic mechanism. A second connecting rod is fixedly installed on the outer surface of the discharge cone. A stroke sleeve is fixedly installed at one end of the second connecting rod. A connecting rod is fixedly installed near the middle position on the outer surface of the stroke sleeve. The slider has an annular plate fixedly mounted on its outer surface. An annular hole is formed at the top of the annular plate, and a baffle rod is installed inside the annular hole. A protrusion is provided on the back of the baffle near the bottom, passing through the discharge hole and contacting the bottom surface of the annular plate. The crushing device includes a crushing cylinder with an annular base on its outer surface. An annular base is fixedly mounted on the outer surface of the crushing cylinder near the bottom. An impact plate is movably mounted on the top of the annular base. A stroke hole is formed on the outer surface of the crushing cylinder above the annular base. An inclined surface is provided at the top of the crushing cylinder. The top of the device has a top hole near the center. A connecting seat is provided near the top of the inner cavity of the crushing cylinder. A spring rod is fixedly installed at the bottom of the connecting seat. A sliding connecting seat is movably installed on the outer surface of the spring rod. The stroke hole is movably engaged with the connecting slider. The impact plates are distributed in a ring array. The impact plates are movably sleeved with the ring base by a spring shaft. The impact plates are initially in a vertical state. During the downward movement of the baffle rod, the impact plates will be pushed to rotate to the right, thereby making the impact plates tilted. At the same time, the impact plates will extend out from the gap between the baffle rods and be above the ring plates.

2. The crusher for recycled concrete according to claim 1, characterized in that, The first screening holes are distributed in a rectangular array, and the discharge holes are distributed in a ring array.

3. A crusher for recycled concrete according to claim 1, characterized in that, The baffles are arranged in a circular array, and the cross-sectional shape of the baffles is an equilateral triangle with the tip pointing directly downwards.

4. A crusher for recycled concrete according to claim 1, characterized in that, The inner ring of the sliding connecting seat is movably fitted with a conveying pipe through bearing engagement. A guide plate is provided on the top of the conveying pipe. An annular side plate is fixedly installed on the outer surface of the guide plate. A conical top plate is fixedly installed on the top of the annular side plate. A second screening hole is opened on the top of the conical top plate. A stop cone is fixedly installed on the bottom of the annular side plate.

5. A crusher for recycled concrete according to claim 4, characterized in that, The feed pipe extends into the interior of the crushing cylinder through the top hole, the second screen holes are distributed in a ring array, and the bottom of the stop cone is in contact with the top hole of the crushing cylinder.

6. A crusher for recycled concrete according to claim 1, characterized in that, The top of the impact plate is provided with an inclined surface, and the impact plate is located directly below and slightly to the right of the stop bar.

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