Multi-stage crushing and dust suppression integrated treatment machine for construction waste

Abstract

This invention discloses an integrated multi-stage crushing and dust suppression machine for construction waste, comprising: a frame, on which a feeding channel, a primary jaw crusher, a secondary crushing mechanism, and a discharge channel are sequentially arranged; a transmission mechanism, mounted on the frame and connected to the primary jaw crusher and the secondary crushing mechanism; and a torque protection limiter, mounted on the transmission mechanism. The discharge channel includes a water mist cyclone hood, which has a contraction section, a throat, and a diffusion section. The throat is connected to an external water tank via a water suction pipe connected to its side wall. This invention, by equipping a torque protection limiter between the primary jaw crusher, the secondary crushing mechanism, and the transmission mechanism, achieves overload self-protection, ensures uniform particle size through multi-stage crushing, and further realizes low-energy consumption, high-efficiency dust suppression, and compact and environmentally friendly integrated operation by utilizing Venturi self-priming atomization technology.

Description

Technical Field

[0001] This invention relates to the field of construction waste crushing technology, specifically to an integrated multi-stage crushing and dust suppression machine for construction waste. Background Technology

[0002] Currently, crushing construction waste is a key step in achieving its reduction and resource recovery. However, existing construction waste crushing and dust removal equipment has the following drawbacks in practical use: First, regarding the transmission safety of multi-stage crushing, existing multi-stage crushing equipment for construction waste generally lacks an effective overload protection mechanism, which can easily lead to motor burnout due to the presence of hard materials such as steel bars and concrete blocks that are difficult to crush in construction waste. Secondly, in terms of dust suppression efficiency, existing construction waste crushing equipment mainly uses methods such as spraying water or negative pressure dust collection to reduce dust. However, the above-mentioned spraying water method not only consumes a lot of water and has limited atomization effect, but the negative pressure dust collection method requires additional dust removal devices, which increases the overall energy consumption and floor space of the equipment. Third, in terms of structural compactness, existing multi-stage crushing equipment with dust suppression function often has its crushing mechanism, screening mechanism and dust suppression system arranged separately, resulting in a large overall size and large footprint of the equipment, which makes it difficult to meet the requirements of construction site for equipment compactness.

[0003] Therefore, in order to solve the above problems, an integrated multi-stage crushing and dust suppression machine for construction waste is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated multi-stage crushing and dust suppression machine for construction waste. By equipping a torque protection limiter between the primary jaw crusher, the secondary crushing mechanism and the transmission mechanism, it achieves overload self-protection, ensures uniform particle size through multi-stage crushing, and further realizes low-energy consumption, high-efficiency dust suppression and compact and environmentally friendly integrated operation by utilizing Venturi self-priming atomization technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage crushing and dust suppression integrated treatment machine for construction waste, comprising: a frame, on which a feeding channel, a primary jaw crusher, a secondary crushing mechanism, and a discharge channel are sequentially arranged; the primary jaw crusher is located within the feeding channel, and the secondary crushing mechanism is located within the frame; a transmission mechanism, mounted on the frame and connected to the primary jaw crusher and the secondary crushing mechanism; and a torque protection limiter, mounted on the transmission mechanism, which protects the transmission torque when the primary jaw crusher or the secondary crushing mechanism receives uncrushable material, causing the transmission torque to exceed the limit. When the set threshold is exceeded, the torque protection limiter activates, causing the primary jaw crusher, secondary crushing mechanism, and transmission mechanism to disengage and idle. The discharge channel includes a water mist cyclone hood, which has a contraction section, a throat, and a diffusion section. The throat is connected to an external water tank via a water suction pipe connected to its side wall. When the primary jaw crusher is working, the high-speed airflow generated at the discharge port of the secondary crushing mechanism enters the contraction section and forms a negative pressure at the throat. Water is automatically drawn from the external water tank through the water suction pipe and atomized and sprayed out, thereby achieving dust suppression during the crushing process.

[0006] Preferably, the frame includes a base frame and a crushing box fixed to the base frame, wherein the feeding channel and the discharging channel are respectively assembled at the top and bottom of the crushing box and are both connected to the crushing box, and the secondary crushing mechanism is disposed inside the crushing box.

[0007] Preferably, the secondary crushing mechanism includes: a rotating shaft, which is horizontally installed in the middle of the rotating shaft; a rotor, which is fixed on the rotating shaft and built into the crushing box; a hammer plate that is annularly installed on the rotor; and a plurality of impact plate structures, which are staggered in the lower part of the crushing box and have their impact surfaces facing the rotor.

[0008] Preferably, each of the impact plate structures includes an impact plate body, the top of which is rotatably connected to the side wall of the crushing box via a pin, and an elastic connector is provided at its bottom; a through hole is opened in the lower part of the crushing box, an installation sleeve is provided in the through hole, a nut is rotatably installed with the outer end of the installation sleeve, and a screw is provided in the installation sleeve, with one end of the screw extending into the interior of the crushing box and fixed with the elastic connector, and the other end passing through the installation sleeve and threadedly connected to the installation sleeve.

[0009] Preferably, the transmission mechanism includes a mounting block fixed to the feed channel, two mounting boxes fixed to the mounting block and interconnected with each other, and two transmission rods. The two transmission rods are respectively transversely penetrating the side walls of the two mounting boxes, and one end of each transmission rod extends into the interior of the two mounting boxes and is connected to a torque protection limiter. The other end of one of the transmission rods is connected to the main shaft of the primary jaw crusher. The other end of the other transmission rod is fixed with a first transmission roller. A second transmission roller is disposed at the end of the shaft extending out of the crushing box. A transmission belt is sleeved between the first transmission roller and the second transmission roller.

[0010] Preferably, the torque protection limiter is located on the drive shaft that runs laterally through both mounting boxes, and the drive shaft extends through both mounting boxes. Preferably, it also includes a servo motor, which is mounted on the side wall of one of the mounting boxes, and a coupling with its output end fixed passes through a mounting hole opened in the side wall of one of the mounting boxes and is fixedly connected to the drive shaft. When the drive shaft is running, it is used for the synchronous operation of the primary jaw crusher and the secondary crushing mechanism.

[0011] Preferably, there are two torque protection limiters. Each torque protection limiter includes a first end ring and a second end ring, which are built into the corresponding mounting box and fixed to the drive shaft. A friction plate, a first transmission gear, and a spring are sequentially sleeved on the drive shaft, and the spring pushes the first transmission gear against the friction plate. The friction plate is connected to the first end ring. The device also includes a second transmission gear, which is located at the end of the corresponding transmission rod that extends into the mounting box, and the second transmission gear meshes with the first transmission gear.

[0012] Preferably, the side wall of the discharge channel is also provided with a dust collection mechanism; the dust collection mechanism includes a dust collection hood, which is connected to the side wall of the contraction section where the water mist cyclone hood is located; a connecting pipe, at the end of the connecting pipe away from the dust collection hood, a dust removal device and a dust collection box are provided, and the dust removal device is connected to the frame, and the dust collection box is connected to the output end of the dust removal device and is used to collect dust.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention integrates crushing, protection, and dust removal. The frame sequentially integrates a primary jaw crusher and a secondary fine crusher, ensuring uniformity of output. The transmission system is equipped with a torque protection limiter that automatically disengages when encountering uncrushable materials, effectively preventing equipment jamming or damage and improving operational reliability. Simultaneously, the discharge channel features a Venturi-structured water mist cyclone hood. This not only utilizes the negative pressure generated by the crushing airflow in the throat to automatically draw in water and atomize it without the need for external pumps or valves, but also allows dust suppression to start and stop synchronously with the crushing process without lag. Furthermore, the water mist and dust-laden airflow are fully swirled and mixed, efficiently capturing fine dust and achieving low-energy consumption and highly adaptable cleaning operations. Attached Figure Description

[0014] Figure 1 This is a first-view three-dimensional structural diagram of the present invention; Figure 2 for Figure 1 A partially enlarged schematic diagram of the transmission mechanism and torque protection limiter; Figure 3 This is a second-view three-dimensional structural diagram of the present invention; Figure 4 This is a top view of the structure of the present invention; Figure 5 for Figure 4 A partially enlarged schematic diagram of the transmission mechanism and torque protection limiter; Figure 6 This is a front view structural diagram of the present invention; Figure 7 for Figure 6 A schematic diagram of the internal structure cut along section AA. Figure 8 for Figure 6 Schematic diagram of the cross-sectional structure along the middle BB.

[0015] In the picture: 01. Base frame; 02. Crushing box; 03. Feed channel; 031. Primary jaw crusher; 04. Secondary crushing mechanism; 041. Shaft; 042. Rotor; 0421. Hammer; 043. Mounting sleeve; 044. Screw; 045. Elastic connector; 046. Nut; 047. Impact plate; 05. Water mist swirl cover; 06. Water suction tube; 07. Dust collection mechanism; 071. Dust hood; 074. Connecting pipe; 075. Dust removal equipment; 076. Dust collection box; 08. Transmission mechanism; 081. Mounting block; 082. Mounting box; 083. Drive shaft; 084. Servo motor; 085. First end ring; 086. Second end ring; 087. Friction plate; 088. First transmission gear; 089. Spring; 0810. Transmission rod; 0811. Second transmission gear; 0814. First transmission roller; 0815. Second transmission roller; 0816. Transmission belt. Detailed Implementation

[0016] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. The various embodiments of this invention are described in detail below with reference to the accompanying drawings.

[0017] Example 1 Please see Figures 1 to 8 The present invention preferably provides a technical solution: a multi-stage crushing and dust suppression integrated treatment machine for construction waste, comprising: a frame, on which a feeding channel 03, a primary jaw crusher 031, a secondary crushing mechanism 04, and a discharge channel are sequentially arranged; the primary jaw crusher 031 is located within the feeding channel 03, and the secondary crushing mechanism 04 is located within the frame; a transmission mechanism 08 is mounted on the frame and connected to the primary jaw crusher 031 and the secondary crushing mechanism 04; and a torque protection limiter is mounted on the transmission mechanism 08, which, when the primary jaw crusher 031 or the secondary crushing mechanism 04 enters uncrushable material, causes a torque limiter to be triggered. When the transmission torque exceeds the set threshold, the torque protection limiter activates, causing the primary jaw crusher 031, the secondary crushing mechanism 04, and the transmission mechanism 08 to disengage and idle. The discharge channel includes a water mist cyclone 05, which has a contraction section, a throat, and a diffusion section. The throat is connected to an external water tank via a water suction pipe 06 connected to its side wall. When the primary jaw crusher 031 is working, the high-speed airflow generated at the discharge port of the secondary crushing mechanism 04 enters the contraction section and forms a negative pressure at the throat. Water is automatically drawn from the external water tank through the water suction pipe 06 and atomized and sprayed out to achieve dust suppression during the crushing process.

[0018] like Figure 1 , 2 As shown in Figures 3 and 4, this invention constructs a safety design for mechanical transmission by assembling a torque protection limiter between the primary jaw crusher 031, the secondary crushing mechanism 04, and the transmission mechanism 08. Specifically, when uncrushable materials such as steel bars or concrete blocks are accidentally mixed into the primary jaw crusher 031 or the secondary crushing mechanism 04, the torque protection limiter is immediately triggered once the transmission torque exceeds the preset safety threshold, causing the crushing working mechanism to automatically disengage from the power transmission chain and enter an idling state. This design fundamentally avoids major mechanical failures such as equipment jamming, gear grinding, and motor burnout caused by overload, effectively extending the service life of core components and the entire machine, and reducing the risk of unplanned downtime. It is especially suitable for construction waste processing conditions with complex composition and high impurity rate. Furthermore, after the primary jaw crusher 031 performs coarse crushing, the secondary crushing mechanism 04 performs fine crushing, which is reasonable in terms of gradation and avoids the problems of overload of single-stage crushing or uneven output particle size. At the same time, due to the torque protection limiter reducing jamming failures, the equipment can maintain a high crushing frequency for a long time and the output particle size is uniform. Furthermore, the primary jaw crusher 031 is integrated into the feed channel 03, the secondary crushing mechanism 04 is integrated into the frame, and the water mist cyclone hood 05 is installed at the discharge port of the frame, forming a continuous closed processing flow line from feeding, crushing to discharge and dust removal. This integrated layout has the following advantages: First, it significantly reduces the equipment footprint and the number of conveying and transfer links, reducing secondary dust generated during intermediate transfer; Second, the dust suppression structure is integrated into the discharge channel, unaffected by external wind direction and climate, and the dust suppression effect is continuous and stable, enabling the whole machine to operate efficiently and environmentally in complex working environments such as open-air and confined construction sites. The discharge channel innovatively adopts a water mist cyclone hood 05 with a contraction section, a throat, and a diffusion section, and cleverly utilizes the high-speed airflow generated at the discharge port of the secondary crushing mechanism 04 as the sole power source. When the high-speed airflow flows through the throat, a negative pressure zone is automatically formed based on the Venturi effect. Water is then drawn from the water tank without power through the water suction pipe 06 and sprayed onto the throat. This design has the following three advantages: First, it eliminates the need for additional water pumps, air compressors, or electrically controlled atomizing equipment, relying entirely on the airflow energy of the crushing process itself to achieve "air-carrying water and water-suppressing dust," significantly reducing operating energy consumption and electrical control costs. Second, the dust suppression action starts and stops synchronously with the crushing operation without delay, avoiding the lag problem of traditional spraying systems requiring independent start-up and adjustment. Third, the water flow fully mixes and swirls with the dust-laden airflow inside the cyclone hood, significantly increasing the contact probability between dust particles and droplets, resulting in excellent capture and settling effects for fine dust, ensuring that the discharge port emissions meet standards.

[0019] Furthermore, the frame includes a base frame 01 and a crushing box 02 fixed to the base frame 01. The feed channel 03 and discharge channel are respectively mounted on the top and bottom ends of the crushing box 02 and are both connected to the crushing box 02. A secondary crushing mechanism 04 is housed within the crushing box 02. Figure 1 , 3 As shown in Figures 7 and 8.

[0020] Example 2 In another embodiment of the present invention, the secondary crushing mechanism 04 includes: a rotating shaft 041, which is horizontally installed in the middle of the rotating shaft 041; a rotor 042, which is fixed on the rotating shaft 041 and built into the crushing box 02; a hammer 0421 that is annularly installed on the rotor 042; and a plurality of impact plate structures, which are staggered in the lower part of the crushing box 02 and have their impact surfaces facing the rotor 042.

[0021] This implementation example Figure 7 ,8 As shown, the secondary crushing mechanism 04 is composed of a rotating shaft 041, a rotor 042, a ring-shaped hammer 0421 mounted on the rotor 042, and several staggered impact plates. It achieves efficient secondary fine crushing. The hammer 0421 rotates at high speed with the rotor 042 and forms a multi-angle, multi-level impact crushing path with the staggered impact plates. This causes the material after primary jaw crushing to be repeatedly impacted and ground in the closed cavity, significantly improving the crushing ratio and output uniformity.

[0022] Furthermore, each impact plate structure includes an impact plate body 047, the top of which is rotatably connected to the side wall of the crushing box 02 via a pin, and an elastic connector 045 is provided at its bottom; a through hole is opened in the lower part of the crushing box 02, an installation sleeve 043 is provided in the through hole, a nut 046 is rotatably installed on the outer end of the installation sleeve 043, and a screw 044 is provided in the installation sleeve 043, with one end of the screw 044 extending into the interior of the crushing box 02 and fixed to the elastic connector 045, and the other end passing through the installation sleeve 043 and threadedly connected to the installation sleeve 043.

[0023] like Figure 7 , 8 As shown, the impact plate 047 is installed here. One end of it is rotatably installed on the side wall of the crushing box 02 via a pin, and the other end is connected to the elastic connector 045 at the end of the screw 044. This design gives the impact plate 047 the dual functions of floating adjustment and overload buffering. Secondly, by rotating the nut 046, which is sleeved on the outer end of the screw 044 and rotated with the mounting sleeve 043, the screw 044 can be extended and retracted, thereby conveniently adjusting the gap between the impact plate 047 and the rotor 042, so as to flexibly adjust the discharge particle size according to the actual material characteristics, and improve the equipment's adaptability to construction waste of different compositions. Furthermore, the elastic connector 045 is preferably a butterfly spring, which has a small axial space, high stiffness, and strong buffering and energy absorption capacity.

[0024] Example 3 In another embodiment of the present invention, the transmission mechanism 08 includes a mounting block 081 fixed to the feed channel 03, two mounting boxes 082 fixed to and interconnected with the mounting block 081, and two transmission rods 0810. The two transmission rods 0810 respectively pass through the side walls of the two mounting boxes 082 laterally, and one end of each transmission rod 0810 extends into the interior of the two mounting boxes 082 and is connected to a torque protection limiter. The other end of one transmission rod 0810 is connected to the main shaft of the first-stage jaw crusher 031. The other end of the other transmission rod 0810 is fixed with a first transmission roller 0814. A second transmission roller 0815 is disposed at one end of the rotating shaft 041 extending out of the crushing box 02. A transmission belt 0816 is sleeved between the first transmission roller 0814 and the second transmission roller 0815. A transmission shaft 083 passes through the two mounting boxes 082 laterally, and the torque protection limiter is disposed on the transmission shaft 083 inside the two mounting boxes 082.

[0025] Furthermore, it also includes a servo motor 084, which is mounted on the side wall of one of the mounting boxes 082, and a coupling fixed at its output end passes through a mounting hole opened in the side wall of one of the mounting boxes 082 and is fixedly connected to the drive shaft 083. When the drive shaft 083 is running, it is used for the synchronous operation of the primary jaw crusher 031 and the secondary crushing mechanism 04.

[0026] like Figure 1 , 2 As shown in Figures 4 and 5, two transmission rods 0810 are provided on one side of the two mounting boxes 082. One end of each rod can be connected to the main shaft of the first-stage jaw crusher 031 and the first transmission roller 0814, respectively. A transmission belt 0816 is sleeved between the first transmission roller 0814 and the second transmission roller 0815 provided at the end of the rotating shaft 041. The other end of the two transmission rods 0810 is connected to the torque protection limiter, thus realizing independent overload protection for the first-stage jaw crusher 031 and the second-stage crushing mechanism 04. Furthermore, by adding a servo motor 084 mounted on the side wall of one of the mounting boxes 082, and fixing the output shaft of the servo motor 084 to the transmission shaft 083 via a coupling, a compact design of a single power source synchronously driving two-stage crushing mechanism is achieved. This solution eliminates the need to configure a separate motor for each stage of crushing, reducing the overall manufacturing cost and electrical control complexity. At the same time, the servo motor 084 is directly fixed on one of the mounting boxes 082, forming a rigid whole with the transmission mechanism 08, reducing power loss caused by belt slippage or coupling misalignment. This ensures the speed synchronization and torque matching of the first-stage jaw crusher and the second-stage crushing mechanism 04 under heavy-load conditions, thereby coordinating the crushing rhythm of the two stages and avoiding material accumulation or idling energy consumption caused by speed mismatch.

[0027] Example 4 In another embodiment of the present invention, there are two torque protection limiters. Each torque protection limiter includes a first end ring 085 and a second end ring 086, which are built into the corresponding mounting box 082 and fixed to the drive shaft 083. A friction plate 087, a first transmission gear 088, and a spring 089 are sequentially sleeved on the drive shaft 083, and the spring 089 pushes the first transmission gear 088 against the friction plate 087. The friction plate 087 is connected to the first end ring 085. A second transmission gear 0811 is also included, which is disposed at one end of the corresponding transmission rod 0810 that extends into the mounting box 082, and the second transmission gear 0811 meshes with the first transmission gear 088.

[0028] The implementation is, for example Figure 2 , 5 As shown, when the transmission torque of the primary jaw crusher 031 and the secondary crushing mechanism 04 is normal, the spring 089 presses the friction plate 087, causing the first end ring 085, the second end ring 086 and the first transmission gear 088 to rotate synchronously, and the power is output to the corresponding crushing mechanism through gear meshing. Once overloaded, the second transmission gear 0811 directly jams the first transmission gear 088 that meshes with it. At this time, the friction plate 087 slips relative to the first transmission gear 088, thereby disengaging the first end ring 085 from the first transmission gear 088. Then, the transmission shaft 083 drives the first end ring 085 and the second end ring 086 to immediately rotate freely. Compared with electronic torque sensors, this structure has the advantages of not requiring an external power supply, strong anti-interference, and millisecond-level response speed. Moreover, after the overload is released, the spring 089 automatically resets, eliminating the need for manual re-engagement and greatly reducing downtime maintenance time. It is especially suitable for harsh working conditions in construction waste treatment where uncrushable materials are frequently encountered.

[0029] Example 5 In another embodiment of the present invention, a dust collection mechanism is also provided on the side wall of the discharge channel; the dust collection mechanism includes a dust collection hood 071, which is connected to the side wall of the contraction section where the water mist cyclone hood 05 is located; a connecting pipe 074, at one end of the connecting pipe 074 away from the dust collection hood 071, a dust removal device 075 and a dust collection box 076 are provided, and the dust removal device 075 is connected to the frame, and the dust collection box 076 is connected to the output end of the dust removal device 075 and is used to collect dust.

[0030] like Figure 8 As shown, the dust collection mechanism in this embodiment includes a dust collection hood 071, a connecting pipe 074, a dust removal device 075, and a dust collection box 076 connected in sequence. In this design, when the dust removal device 075 is working, the dust collection hood 071 can draw dust-laden airflow from the contraction section where the water mist cyclone hood 05 is located. When the dust-laden airflow passes through the dust removal device 075, the dust is collected in the dust collection box 076, and the gas is discharged. The dust collection box 076 and the dust removal equipment 075 can be detached and installed here for easy subsequent cleaning; The preferred dust removal equipment 075 is a cyclone dust collector, which uses the centrifugal force generated by high-speed rotating airflow to throw dust particles against the wall of the device and settle down, thereby collecting dust. Meanwhile, only the dust-laden airflow is sucked in here, while the shredded building materials can still quickly pass through the throat and diffuser sections and generate negative pressure to achieve water suction.

[0031] It is worth noting that the first-stage jaw crusher 031 in this application is a mature existing technology. It mainly consists of core components such as a frame, moving and fixed jaw plates, an eccentric shaft, and an toggle plate. It achieves crushing by reciprocating and squeezing the material through the moving jaw plate. Specifically, the pulley of the first-stage jaw crusher 031 is connected to the main shaft, and one of the transmission rods 0810 in this application is connected to the main shaft. When the pulley rotates, it drives the eccentric shaft to rotate. Since the upper end of the moving jaw plate is mounted on the eccentric shaft, when the moving jaw plate deflects, it moves closer to the fixed jaw plate. The material between the two jaw plates is crushed by the combined action of squeezing, splitting, and grinding. When the moving jaw plate moves downward, it moves away from the fixed jaw plate under the action of the pull rod and the reset structure. The crushed material is discharged from the discharge port at the bottom of the crushing chamber under the action of gravity. As the eccentric shaft rotates continuously, the moving jaw plate reciprocates periodically, realizing continuous crushing operation.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms “installation,” “connection,” “linking,” “fixing,” etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part. There are various ways to install detachably, such as by using a plug-in and snap-fit ​​method, or by using a bolt connection, etc.

[0033] The above embodiments, which describe the specific features of the present invention, are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above description of the invention shall fall within the scope of protection of the present invention.

Claims

1. A multi-stage crushing and dust suppression integrated processing machine for construction waste, characterized in that, include: The frame is provided with a feeding channel (03), a primary jaw crusher (031), a secondary crushing mechanism (04), and a discharge channel in sequence. The primary jaw crusher (031) is located inside the feed channel (03), and the secondary crushing mechanism (04) is located inside the frame; The transmission mechanism (08) is mounted on the frame and connected to the primary jaw crusher (031) and the secondary crushing mechanism (04). A torque protection limiter is mounted on the transmission mechanism (08). When the primary jaw crusher (031) and the secondary crushing mechanism (04) enter an uncrushable object and cause the transmission torque to exceed a set threshold, the torque protection limiter is activated, causing the primary jaw crusher (031) and the secondary crushing mechanism (04) to disengage from the transmission mechanism (08) and run idle. The discharge channel includes a water mist cyclone hood (05), which has a contraction section, a throat, and a diffusion section. The throat is connected to an external water tank through a water suction pipe (06) connected to its side wall. When the primary jaw crusher (031) is working, the high-speed airflow generated by the discharge port of the secondary crushing mechanism (04) enters the contraction section and forms a negative pressure at the throat. The water suction pipe (06) automatically draws water from the external water tank and atomizes it to spray out, thereby achieving dust suppression during the crushing process.

2. The integrated multi-stage crushing and dust suppression machine for construction waste according to claim 1, characterized in that: The frame includes a base frame (01) and a crushing box (02) fixed to the base frame (01). The feeding channel (03) and the discharging channel are respectively assembled at the top and bottom of the crushing box (02) and are both connected to the crushing box (02). The secondary crushing mechanism (04) is located inside the crushing box (02).

3. The integrated multi-stage crushing and dust suppression machine for construction waste according to claim 2, characterized in that: The secondary crushing mechanism (04) includes: The rotating shaft (041) is horizontally installed in the middle of the rotating shaft (041); The rotor (042) is fixed on the shaft (041) and built into the crushing box (02), and the hammer (0421) is mounted on the rotor (042) in a ring. And several impact plate structures, which are staggered in the lower part of the crushing box (02) and have their impact surfaces facing the rotor (042).

4. The integrated multi-stage crushing and dust suppression machine for construction waste according to claim 3, characterized in that: Each of the aforementioned impact plate structures includes an impact plate body (047), the top of which is rotatably connected to the side wall of the crushing box (02) via a pin, and an elastic connector (045) is provided at its bottom. The crushing box (02) has a through hole at the bottom, an installation sleeve (043) inside the through hole, a nut (046) rotatably installed on the outer end of the installation sleeve (043), and a screw (044) inside the installation sleeve (043). One end of the screw (044) extends into the crushing box (02) and is fixed to the elastic connector (045), and the other end passes through the installation sleeve (043) and is threadedly connected to the installation sleeve (043).

5. The integrated multi-stage crushing and dust suppression machine for construction waste according to claim 3, characterized in that: The transmission mechanism (08) includes a mounting block (081) fixed to the feeding channel (03), two mounting boxes (082) fixed to the mounting block (081) and connected to each other, and two transmission rods (0810). The two transmission rods (0810) pass through the side walls of the two mounting boxes (082) laterally, and one end of the two transmission rods (0810) extends into the interior of the two mounting boxes (082) and is connected to the torque protection limiter. One of the drive rods (0810) is connected at one end to the main shaft of the primary jaw crusher (031); The other end of the other drive rod (0810) is fixed with a first drive roller (0814). The second transmission roller (0815) is located at one end of the shaft (041) that extends out of the crushing box (02); The transmission belt (0816) is fitted between the first transmission roller (0814) and the second transmission roller (0815).

6. The integrated multi-stage crushing and dust suppression machine for construction waste according to claim 5, characterized in that: And a drive shaft (083) that runs laterally through the two mounting boxes (082), the torque protection limiter being disposed on the drive shaft (083) inside the two mounting boxes (082).

7. The integrated multi-stage crushing and dust suppression machine for construction waste according to claim 6, characterized in that: It also includes a servo motor (084), which is mounted on the side wall of one of the mounting boxes (082), and the coupling with its output end fixed passes through the mounting hole opened on the side wall of one of the mounting boxes (082) and is fixedly connected to the drive shaft (083). When the drive shaft (083) runs, it is used for the synchronous operation of the primary jaw crusher (031) and the secondary crushing mechanism (04).

8. The integrated multi-stage crushing and dust suppression machine for construction waste according to claim 6, characterized in that: The torque protection limiter is of two types, each torque protection limiter including a first end ring (085) and a second end ring (086), the first end ring (085) and the second end ring (086) are built into the corresponding mounting box (082) and fixed to the drive shaft (083); The friction plate (087), the first transmission gear (088), and the spring (089) are sequentially sleeved on the transmission shaft (083), and the spring (089) pushes the first transmission gear (088) against the friction plate (087), and the friction plate (087) is connected to the first end ring (085); It also includes a second transmission gear (0811), which is disposed at one end of the corresponding transmission rod (0810) that extends into the mounting box (082), and the second transmission gear (0811) meshes with the first transmission gear (088).

9. The integrated multi-stage crushing and dust suppression machine for construction waste according to claim 1, characterized in that: The side wall of the discharge channel is also equipped with a dust collection mechanism; The dust collection mechanism includes a dust collection hood (071) connected to the side wall of the converging section where the water mist swirl hood (05) is located; A connecting pipe (074) is provided with a dust removal device (075) and a dust collection box (076) at one end away from the dust collection hood (071). The dust removal device (075) is connected to the frame, and the dust collection box (076) is connected to the output end of the dust removal device (075) and is used to collect dust.

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