Pretreatment device for polyurethane cemented gravel slope protection aggregate

Abstract

According to the pretreatment device for the polyurethane cemented gravel slope protection aggregate, the combustion furnace, the dryer and the dust removal assembly can be used for drying, cleaning and dust removal of the polyurethane cemented gravel slope protection aggregate in a production workshop, and baking and blowing replace washing in the pretreatment of the polyurethane cemented gravel slope protection aggregate. The water environmental protection problem caused by sewage discharge is avoided; meanwhile, generation of stone powder is reduced, and the strength of the slope protection aggregate and the safety of the slope protection structure are guaranteed; in addition, pretreatment of the slope protection aggregate can be carried out indoors and is not affected by weather, the construction period is effectively shortened, construction is simple, pretreatment of the slope protection aggregate can be carried out on a large scale, and the construction efficiency is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of material preparation equipment and relates to a pretreatment device for aggregate. Background Technique

[0002] Polyurethane-bonded crushed stone materials can be used for slope protection projects of riverbanks, lakes, reservoirs, etc., especially for flood control and ecological restoration projects with high requirements for anti-scouring, anti-erosion and ecological protection. The polyurethane-bonded crushed stone slope protection aggregate requires clean, hard, impurity-free, low water absorption and low moisture content crushed stone aggregate. Therefore, the pretreatment of polyurethane-bonded crushed stone slope protection aggregate is one of the important links in slope protection construction. At present, on-site water washing and sun drying are generally adopted, and this method has the following problems: (1) High cost of environmental protection treatment: A large amount of sewage will be generated after the crushed stone aggregate is washed, and necessary water environmental protection measures need to be adopted, resulting in waste of water and increase in project cost; (2) Strength reduction: When the aggregate is washed and sun dried, the loader track and bucket will inevitably cause a large amount of rolling and friction on the aggregate, resulting in aggregate crushing, generating a large amount of stone powder and debris, which has an adverse effect on the subsequent bonding of the aggregate and polyurethane, reducing the strength of the polyurethane-bonded crushed stone and affecting the safety of the slope protection structure; (3) Unstable construction period: The aggregate drying must be carried out on sunny days, and the size of the drying yard directly affects the efficiency of aggregate pretreatment and the construction period. If it rains or is cloudy, the aggregate cannot be dried, seriously affecting the construction period. Content of the Utility Model

[0003] In order to solve the problems of high cost of environmental protection treatment, strength reduction and unstable construction period in the pretreatment of polyurethane-bonded crushed stone slope protection aggregate described in the background technique, the utility model provides a pretreatment device for polyurethane-bonded crushed stone slope protection aggregate.

[0004] The utility model includes a feed bin, a combustion furnace, a dryer, a blanking hopper, a dust removal component, a storage bin and a blowing and / or air inducing mechanism; the polyurethane-bonded crushed stone slope protection aggregate in the feed bin is transported to the combustion furnace; the combustion furnace is connected with the dryer; the discharge port of the dryer is connected with the blanking hopper; the top of the blanking hopper is connected with the dust removal component through an air inlet pipe, and a storage bin is arranged at the bottom of the discharge port of the blanking hopper; the air of the blowing and / or air inducing mechanism passes through the combustion furnace, the dryer, the blanking hopper and the dust removal component.

[0005] Further, a conveyor is arranged between the feed bin and the combustion furnace, and the bottom discharge port of the feed bin is transported to the combustion furnace through the conveyor. The conveyor can ensure that the aggregate will not spill while transporting the aggregate.

[0006] Preferably, the conveyor is a screw conveyor.

[0007] Furthermore, a hopper sieve and an air supply port are provided at the top of the combustion furnace. The top of the hopper sieve is connected to the discharge port of one end of the conveyor, and a blower is provided at the air supply port.

[0008] Preferably, the combustion furnace is a diesel combustion furnace.

[0009] Preferably, the dryer is a three-pass dryer.

[0010] Furthermore, a chute is provided between the combustion furnace and the dryer, and the material outlet of the combustion furnace is connected to the inlet of the dryer through the chute.

[0011] Furthermore, the dust removal assembly includes a two-stage dust removal mechanism composed of a cyclone dust collector and a pulse dust collector connected.

[0012] Furthermore, one side of the cyclone dust collector is connected to the top of the hopper through the cyclone dust collector inlet pipe. The top of the cyclone dust collector is connected to the pulse dust collector through the cyclone dust collector outlet pipe, and a slag discharge port is provided at the bottom of the cyclone dust collector. The cyclone dust collector is used to discharge large particle dust impurities.

[0013] Furthermore, a pulse dust collector inlet is provided on the lower side of the pulse dust collector. The pulse dust collector inlet is connected to the cyclone dust collector outlet pipe. A discharge port is provided on the upper side of the pulse dust collector, and a dust discharge port is provided at the bottom of the pulse dust collector. An induced draft fan is provided at the discharge port. The pulse dust collector is used to discharge the filtered small particle dust impurities.

[0014] Compared with the prior art, the utility model can use a combustion furnace, a dryer, and a dust removal assembly in a production workshop to dry, clean, and remove dust from polyurethane-bonded crushed stone slope protection aggregates. In the pretreatment of polyurethane-bonded crushed stone slope protection aggregates, baking and blowing are used instead of water washing to avoid water environmental protection problems caused by sewage discharge; at the same time, the generation of stone powder is reduced, ensuring the strength of the slope protection aggregates and the safety of the slope protection structure; in addition, the pretreatment of the slope protection aggregates can be carried out indoors, free from the influence of weather, effectively saving the construction period, with simple construction, and the pretreatment of the slope protection aggregates can be carried out on a large scale, greatly improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the utility model.

[0016] Description of the drawing reference numerals: 1 - feed bin; 2 - conveyor; 3 - hopper screen; 4 - air supply port; 5 - combustion furnace; 6 - chute; 7 - dryer; 71 - discharge port; 8 - blanking hopper; 9 - dust removal assembly; 91 - cyclone dust collector; 92 - cyclone dust collector inlet pipe; 93 - cyclone dust collector outlet pipe; 94 - slag discharge port; 95 - pulse dust collector; 96 - pulse dust collector air inlet; 97 - dust discharge port; 98 - air discharge port; 10 - storage bin. Detailed implementation manners

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. The positional relationships described in the embodiments are all the same as those shown in the drawings.

[0018] A pretreatment device for polyurethane-bonded crushed stone slope protection aggregate, as Figure 1 shown, is integrally composed of a feed bin 1, a conveyor 2, a combustion furnace 5, a chute 6, a dryer 7, a blanking hopper 8, a dust removal assembly 9, and a storage bin 10.

[0019] The feed bin 1 is used to place polyurethane-bonded crushed stone slope protection aggregate. The bottom discharge port of the feed bin 1 is transported to the hopper screen 3 at the top of the combustion furnace 5 through the conveyor 2. The conveyor 2 is preferably a screw conveyor, which can transport the aggregate while ensuring that the aggregate will not spill. The combustion furnace 5 is preferably a diesel combustion furnace. An air supply port 4 is also provided at the top of the combustion furnace 5, and a blower can be provided at the air supply port 4. The material outlet of the combustion furnace 5 is connected to the inlet of the dryer 7 through the chute 6. The dryer 7 is preferably a three-pass dryer, and the dryer 7 drives the drying drum to rotate through a motor assembly. The discharge port 71 of the dryer 7 is connected to the blanking hopper 8. The top of the blanking hopper 8 is connected to the dust removal assembly 9 through an inlet pipe. A storage bin 10 is provided at the bottom of the discharge port of the blanking hopper 8 for collecting and storing the pretreated slope protection aggregate.

[0020] As Figure 1As shown in the figure, the dust removal assembly 9 is a two-stage dust removal mechanism composed of a cyclone dust collector 91 and a pulse dust collector 95 connected together. One side of the cyclone dust collector 91 is connected to the top of the hopper 8 through a cyclone dust collector inlet pipe 92. The top of the cyclone dust collector 91 is connected to the pulse dust collector 95 through a cyclone dust collector outlet pipe 93. A slag discharge port 94 is provided at the bottom of the cyclone dust collector 91 for discharging large particle dust impurities. A pulse dust collector air inlet 96 is provided on the lower side of the pulse dust collector 95. The pulse dust collector air inlet 96 is connected to the cyclone dust collector outlet pipe 93. An air discharge port 98 is provided on the upper side of the pulse dust collector 95. A dust discharge port 97 is provided at the bottom of the pulse dust collector 95. An induced draft fan can be provided at the air discharge port 98 for discharging the filtered small particle dust impurities. Through the operation of the two-stage dust removal equipment of the cyclone dust collector 91 and the pulse dust collector 95, the first-stage dust removal equipment, the cyclone dust collector 91, can collect 80% of the impurities, mainly large particle stone slag and stone powder. The second-stage dust removal equipment, the pulse dust collector 95, can collect the remaining 20% of small particle impurities, mainly small particle dust. This not only meets the requirement of clean and dust-free slope protection aggregate, but also ensures that the dust discharged from the air discharge port 98 meets the environmental protection discharge standards.

[0021] Through the air supply port 4 provided at the top of the combustion furnace 5 and the air discharge port 98 provided on the pulse dust collector 95, and through the air supply fan at the air supply port 4 and the induced draft fan at the air discharge port 98, air is made to flow through the combustion furnace 5, the dryer 7, the hopper 8, and the dust removal assembly 9, driving the flow of hot air inside the pretreatment device.

[0022] The working process of the above-mentioned pretreatment device is as follows:

[0023] First, diesel is sprayed into the combustion furnace 5 through an electric fuel injector, and then the combustion furnace 5 is ignited with a lighter. After the temperature inside the combustion furnace 5 rises to 400 °C, the valve of the feed bin 1 is opened, and the conveyor 2 is started to send the untreated polyurethane cemented crushed stone slope protection aggregate to the hopper sieve 3 above the combustion furnace 5. The slope protection aggregate after high-temperature treatment in the combustion furnace 5 enters the dryer 7 through the chute 6. Inside the dryer 7, the moisture on the surface and inside the slope protection aggregate evaporates into water vapor when it encounters the high-temperature air. At the same time, impurities such as dust, stone powder, and stone slag in the crushed stone aggregate are sucked into the first-stage dust removal equipment, the cyclone dust collector 91, by a large suction induced draft fan, and then the second-stage dust removal equipment, the pulse dust collector 95, is used to collect the remaining dust impurities. Finally, the dry and clean slope protection aggregate falls into the storage bin 10 through the hopper 8 and can be directly packed into a canvas ton bag.

[0024] Through production measurement, the pretreatment efficiency of the slope protection aggregate of this pretreatment device can reach 10 tons per hour.

[0025] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings and specific embodiments. However, the present utility model is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solution of the present utility model, and these simple modifications all fall within the protection scope of the present utility model.

Claims

1. A pretreatment device for polyurethane-bonded crushed stone slope protection aggregate, characterized in that: It includes a feed bin (1), a combustion furnace (5), a dryer (7), a blanking hopper (8), a dust removal assembly (9), a storage bin (10), and a air supply and / or air extraction mechanism; The polyurethane-bonded crushed stone slope protection aggregate in the feed bin (1) is transported to the combustion furnace (5); the material outlet of the combustion furnace (5) is connected to the feed inlet of the dryer (7); the discharge port (71) of the dryer (7) is connected to the blanking hopper (8); the top of the blanking hopper (8) is connected to the dust removal assembly (9) through an intake pipe, and the bottom of the discharge port of the blanking hopper (8) is provided with a storage bin (10); the air of the air supply and / or air extraction mechanism passes through the combustion furnace (5), the dryer (7), the blanking hopper (8), and the dust removal assembly (9).

2. The pretreatment device for polyurethane-bonded crushed stone slope protection aggregate according to claim 1, characterized in that: A conveyor (2) is arranged between the feed bin (1) and the combustion furnace (5), and the bottom discharge port of the feed bin (1) is transported to the combustion furnace (5) through the conveyor (2).

3. The pretreatment device for polyurethane-bonded crushed stone slope protection aggregate according to claim 2, wherein: The conveyor (2) is a screw conveyor.

4. The pretreatment device for polyurethane-bonded crushed stone slope protection aggregate according to claim 3, characterized in that: A bucket screen (3) and an air supply port (4) are arranged at the top of the combustion furnace (5), the top of the bucket screen (3) is connected to the discharge port of one end of the conveyor (2), and a blower is arranged at the air supply port (4).

5. The preprocessing device for polyurethane-bonded crushed stone slope protection aggregate according to claim 4, characterized in that: The combustion furnace (5) is a diesel combustion furnace.

6. The pretreatment device for polyurethane-bonded crushed stone slope protection aggregate according to claim 5, characterized in that: The dryer (7) is a three-pass dryer.

7. The pretreatment device for polyurethane-bonded crushed stone slope protection aggregate according to claim 6, characterized in that: A chute (6) is arranged between the combustion furnace (5) and the dryer (7), and the material outlet of the combustion furnace (5) is connected to the feed inlet of the dryer (7) through the chute (6).

8. A pretreatment device for polyurethane-bonded crushed stone slope protection aggregate according to any one of claims 1-7, characterized in that: The dust removal assembly (9) includes a two-stage dust removal mechanism composed of a cyclone dust collector (91) and a pulse dust collector (95) connected.

9. The pretreatment device for polyurethane-bonded crushed stone slope protection aggregate according to claim 8, characterized in that: One side of the cyclone dust collector (91) is connected to the top of the blanking hopper (8) through a cyclone dust collector intake pipe (92), the top of the cyclone dust collector (91) is connected to the pulse dust collector (95) through a cyclone dust collector outlet pipe (93), and a slag discharge port (94) is arranged at the bottom of the cyclone dust collector (91).

10. The pretreatment device for polyurethane-bonded crushed stone slope protection aggregate according to claim 9, characterized in that: A pulse dust collector air inlet (96) is arranged on the lower side of the pulse dust collector (95), the pulse dust collector air inlet (96) is connected to the cyclone dust collector outlet pipe (93), an air discharge port (98) is arranged on the upper side of the pulse dust collector (95), a dust discharge port (97) is arranged at the bottom of the pulse dust collector (95), and an induced draft fan is arranged at the air discharge port (98).

Images