Concrete mixing and spraying machine for mines

Abstract

The application discloses a mine concrete mixing and spraying machine, which comprises a mixing and spraying machine body and a feeding manipulator. The mixing and spraying machine body comprises a main shaft, cement conveying blades, sand and stone conveying blades, stirring blades, conveying blades and a pushing and swirling device. The main shaft is driven to rotate through a transmission device. The cement conveying blades, the sand and stone conveying blades, the stirring blades and the conveying blades are sequentially arranged on the main shaft from an air inlet to an air outlet. The pushing and swirling device comprises a swirling inner tube, a swirling outer tube and pushing blades. The rear end of the swirling inner tube is sleeved in the air outlet of the main shaft. The outer wall of the swirling inner tube is provided with a spiral groove. The swirling outer tube is sleeved on the swirling inner tube. The air from the main shaft enters the spiral groove at the rear end of the swirling inner tube and then comes out of the spiral groove at the front end. The air passes through the inside of the swirling inner tube and then comes out of the front end of the swirling outer tube. The feeding manipulator is used for feeding cement and sand and stone into a hopper. The application can realize sufficient stirring of materials, accurate proportioning and spraying without pipe blockage.

Description

Technical Field

[0001] This invention relates to the field of concrete spraying machine technology, specifically to a mining concrete mixing and spraying machine. Background Technology

[0002] Tunnel support is a major factor affecting the speed of coal mining. Currently, the most common method for tunnel support in domestic coal mines is shotcrete support, which uses a shotcrete machine to spray concrete mixed with a quick-setting agent onto the support surface. After the concrete comes into contact with the surrounding rock, it can form a load-bearing ring with a certain strength in a short time, thus supporting the tunnel. However, the wet shotcrete machines used in existing shotcrete support systems have the following problems: First, wet shotcrete machines require separate loading of cement and sand / gravel during operation, involving manual mixing and feeding within the tunnel, resulting in high dust levels, inaccurate sand / gravel and cement ratios, and high labor intensity for workers. Second, wet shotcrete machines use rotor-type or plunger-type pumps to deliver concrete, which easily leads to concrete pipe blockage, and the "pulsating" phenomenon during spraying affects the spraying effect. Summary of the Invention

[0003] The purpose of this invention is to provide a mining concrete mixing and spraying machine that can achieve precise mixing ratio of sand and cement, spray without pipe blockage, and reduce the labor intensity of workers.

[0004] To achieve the above objectives, the present invention provides a mining concrete mixing and spraying machine, comprising a mixing and spraying machine body and a vehicle body. The mixing and spraying machine body includes a main shaft, cement conveying blades, sand and gravel conveying blades, mixing blades, conveying blades, a pushing and swirling device, a shrinkage inlet, a hopper, and a cylinder. The main shaft is a hollow shaft with an air inlet and an air outlet at both ends. The main shaft is located at the center of the cylinder. The main shaft is driven to rotate via a transmission device. The shrinkage inlet is fixedly connected to the front end of the cylinder. The cement conveying blades, sand and gravel conveying blades, mixing blades, and conveying blades are sequentially arranged on the main shaft from the air inlet to the air outlet. The hopper is fixed to the cylinder. The rear end; the hopper includes a cement hopper and a sand and gravel hopper; the pushing vortex device includes an inner vortex tube, an outer vortex tube, and pushing blades. The rear end of the inner vortex tube is sleeved inside the air outlet of the main shaft; the outer wall of the inner vortex tube is provided with a spiral groove, and the outer vortex tube is sleeved on the inner vortex tube. The air coming out of the air outlet of the main shaft enters from the spiral groove at the rear end of the inner vortex tube and exits from the spiral groove at the front end, forming a spiral wind; another path passes through the inside of the inner vortex tube and exits from the front end of the outer vortex tube, forming a direct wind; the pushing blades are fixed on the outer wall of the outer vortex tube for pushing and dispersing materials; the outer vortex tube is supported by a support seat;

[0005] The concrete mixing and spraying machine also includes a loading robot, the bottom of which is fixed to the vehicle body; the loading robot is used to feed cement and sand into the hopper.

[0006] Furthermore, the main body of the mixer also includes an atomizing nozzle, which is located on the cylinder and is used to supply water to the mixture between the mixing blades.

[0007] Furthermore, the cement conveying blade is located directly below the cement hopper, and the sand and gravel conveying blade is located directly below the sand and gravel hopper.

[0008] Furthermore, the pitch of the sand and gravel conveying blade is greater than the pitch of the cement conveying blade, and they are designed in a certain proportion.

[0009] Furthermore, the stirring blades are composed of left-handed and right-handed blades, which are arranged alternately; the height of the right-handed blades is greater than that of the left-handed blades, which facilitates the forward conveying of materials while stirring.

[0010] Furthermore, the shrinkage outlet is conical in shape, with the larger opening fixedly connected to the front end of the cylinder and the smaller opening serving as the discharge outlet.

[0011] Furthermore, the transmission device includes a main sprocket, a driven sprocket, and a hydraulic motor, with the driven sprocket sleeved at the rear end of the main shaft; the hydraulic motor is connected to the main sprocket.

[0012] Furthermore, the concrete mixer also includes a hydraulic pump station, which is mounted on the vehicle body to provide power to the concrete mixer.

[0013] The beneficial effects of this invention are:

[0014] (1) The mine concrete mixing and spraying machine of the present invention does not require manual mixing of sand, gravel and cement in advance or use with concrete mixing equipment, and can adapt to narrow tunnels and reduce dust.

[0015] (2) The mining concrete mixing and spraying machine of the present invention is equipped with an automatic feeding robot, which eliminates the need for manual feeding and reduces the labor intensity of workers.

[0016] (3) The mining concrete mixing and spraying machine of the present invention can achieve a precise ratio of sand and cement by setting up a cement hopper, cement conveying blades, sand and gravel hoppers and sand and gravel conveying blades, and determining the pitch ratio of the cement hopper and the sand and gravel conveying blades.

[0017] (4) The mining concrete mixer of the present invention is equipped with a pusher vortex device at the discharge port of the spraying mechanism. Under the combined action of the direct current airflow introduced into the main shaft pipe and the vortex airflow introduced into the spiral groove, the concrete material has a high initial velocity when it enters the conveying pipe. The pusher blade can disperse the material, ensuring the uniformity of the material and effectively solving the problem of pipe blockage during the conveying process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the mine concrete mixing and spraying machine of the present invention;

[0019] Figure 2 This is a schematic diagram of the concrete mixing and spraying machine of the present invention;

[0020] Figure 3 This is a three-dimensional structural diagram of the feeding cyclone device;

[0021] Figure 4 This is a schematic diagram of the planar structure of the feeding cyclone device;

[0022] In the diagram, 1-Main body of the mixer; 1-1-Main shaft; 1-2-Sprocket; 1-3-Cement conveying blade; 1-4-Sand and gravel conveying blade; 1-5-Mixing blade; 1-6-Atomizing nozzle; 1-7-Conveying blade; 1-8-Bearing seat; 1-9-Pushing vortex device; 1-9-1-Inner vortex tube; 1-9-2-Outer vortex tube; 1-9-3-Pushing blade; 1-9-4-Spiral groove; 1-10-Contraction port; 1-11-Cement hopper; 1-12-Sand and gravel hopper; 1-13-Cylinder; 2-Car body; 3-Hydraulic pump station; 4-Feeding robot; 5-Main sprocket; 6-Hydraulic motor; 7-Discharge port. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 and Figure 2As shown, a mining concrete mixing and spraying machine includes a main body 1, a vehicle body 2, and a traveling mechanism. The main body 1 includes a main shaft 1-1, cement conveying blades 1-3, sand and gravel conveying blades 1-4, mixing blades 1-5, conveying blades 1-7, a pushing and swirling device 1-9, a shrinkage inlet 1-10, a hopper, and a cylinder 1-13. The main shaft 1-1 is a hollow shaft with an air inlet and an air outlet at both ends. The main shaft 1-1 is located at the center of the cylinder 1-13. The main shaft 1-1 is driven to rotate by a transmission device. The transmission device includes a main sprocket 5, a driven sprocket 1-2, and a hydraulic motor 6. The driven sprocket 1-2 is fitted onto the rear end of the main shaft 1-1, which is supported by a bearing seat. The hydraulic motor 6 is connected to the main sprocket 5, providing power for the rotation of the main shaft 1-1. The shrinkage inlet 1-10 is fixedly connected to the front end of the cylinder 1-13. On the main shaft 1-1, from the air inlet to the air outlet, cement conveying blades 1-3, sand and gravel conveying blades 1-4, mixing blades 1-5, and conveying blades 1-7 are arranged in sequence. The hoppers are fixed at the rear end of the cylinder 1-13. The hoppers include cement hopper 1-11 and sand and gravel hopper 1-12, which are placed close together.

[0025] like Figure 3 and Figure 4As shown, the swirling device 1-9 includes an inner swirling tube 1-9-1, an outer swirling tube 1-9-2, and pusher blades 1-9-3. The rear end of the inner swirling tube 1-9-1 is fitted inside the air outlet of the main shaft 1-1, and the rotation of the main shaft 1-1 can drive the inner swirling tube 1-9-1 to rotate. A spiral groove 1-9-4 is provided on the outer wall of the inner swirling tube 1-9-1. The outer swirling tube 1-9-2 is fitted onto the inner swirling tube 1-9-1, thus the spiral groove 1-9-4 acts like a cover, forming a swirling channel from the rear end to the front end of the inner swirling tube 1-9-1. Furthermore, the inner swirling tube 1-9-1 is hollow inside. The air from the air outlet of the main shaft 1-1 enters through the spiral groove 1-9-4 at the rear end of the inner swirling tube 1-9-1 and exits through the spiral groove 1-9-4 at the other end, forming a spiral airflow. The airflow flows from inside the inner cyclone pipe 1-9 and exits from the front end of the outer cyclone pipe 1-9-2, forming a direct current. Pusher blades 1-9-3 are fixed to the outer wall of the outer cyclone pipe 1-9-2 for pushing and dispersing the material. The outer cyclone pipe 1-9-2 is supported by support base 1-8. Sand and cement are thoroughly mixed by mixing blades 1-5, then pushed forward by conveyor blades 1-7, and the mixture continues to be conveyed forward by the pusher blades. At this point, the direct current and spiral airflow work together to deliver the mixture to outlet 7, forming a jet stream. During this process, due to the combined effect of the two airflows, the jet stream does not produce pulsed ejection, thus preventing pipe blockage. Additionally, the contraction port 1-10 is conical in shape, with its wide opening fixedly connected to the front end of the cylinder 1-13. Making the contraction port 1-10 conical, i.e., adopting a tapered design, aims to reduce the cross-sectional area of ​​the pipe, thereby accelerating the airflow and improving its conveying capacity for concrete materials.

[0026] The concrete mixing and spraying machine also includes a loading robot 4, whose bottom is fixed to the vehicle body 2. The loading robot 4 is used to feed cement and sand into the hopper. This can save manpower and reduce the labor intensity of personnel.

[0027] The main body 1 of the mixer also includes atomizing nozzles 1-6, which are located on the cylinder 1-13 and are used to supply water to the mixture between the mixing blades 1-5.

[0028] Cement conveying blades 1-3 are located directly below cement hopper 1-11, and sand and gravel conveying blades 1-4 are located directly below sand and gravel hopper 1-12. The pitch of the sand and gravel conveying blades 1-4 is greater than that of the cement conveying blades 1-3, and they are designed in a certain proportion. Figure 2As can be seen, the cement hopper 1-11 is located at the rear end of the sand and gravel hopper 1-12, and the cement conveying blade 1-3 is also located at the rear end of the sand and gravel conveying blade 1-4. When the main shaft 1-1 rotates, because the density of cement is less than that of sand and gravel, it will be pressed under the sand and gravel as it moves forward. That is to say, there will always be sand, gravel and cement on the cross-section of the main shaft below the sand and gravel hopper. In this way, they will be pre-mixed first. After reaching the mixing hopper 1-5, they will be stirred and then fully mixed to achieve complete mixing, so that the concrete can meet the standard. During the mixing process, a certain amount of water is added through the atomizing nozzle 1-6. On the other hand, from Figure 2 As can be seen, the pitch of the cement conveying blades 1-3 is smaller than that of the sand plant conveying blades 1-4, and their conveying capacities are different. Among them, the conveying capacity of sand and gravel is larger. As long as the pitch of the two blades is adjusted appropriately, their ratio can be determined, thereby achieving the purpose of precise ratio.

[0029] The mixing blades 1-5 consist of left-handed and right-handed blades, arranged alternately. The height of the right-handed blades is greater than that of the left-handed blades, facilitating mixing while simultaneously conveying materials forward. Since the main shaft 1-1 is constantly rotating, meaning the cement and sand are continuously moving forward, they require sufficient mixing, or a period of time to settle. Therefore, by setting up counter-rotating left-handed blades, a temporary mixing process is achieved, ensuring thorough mixing. The mixed concrete needs to continue moving forward; therefore, by making the height of the right-handed blades greater than that of the left-handed blades, the mixed material can continue to propel forward.

[0030] The hydraulic motor 6 is mounted on the vehicle body 2 to provide power to the concrete mixer sprayer.

[0031] In summary, compared with existing technologies, this device can save manpower and reduce the labor intensity of workers; it can accurately mix sand and cement to meet the requirements of concrete; it can fully mix sand and cement; and through the spiral air, direct air and conical design of the shrinkage nozzle, the slurry can be sprayed out quickly without pipe blockage.

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes that can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A mine concrete mixing and spraying machine, comprising a mixing and spraying machine body (1) and a vehicle body (2), characterized in that, The main body (1) of the mixing and spraying machine includes a main shaft (1-1), cement conveying blades (1-3), sand and gravel conveying blades (1-4), mixing blades (1-5), conveying blades (1-7), a pushing vortex device (1-9), a shrinkage inlet (1-10), a hopper, and a cylinder (1-13); wherein, the main shaft (1-1) is a hollow shaft with an air inlet and an air outlet at both ends; the main shaft (1-1) is located at the center of the cylinder (1-13); the main shaft (1-1) is driven by a transmission device. The cylinder rotates; the contraction inlet (1-10) is fixedly connected to the front end of the cylinder (1-13); on the main shaft (1-1), from the air inlet to the air outlet, the cement conveying blade (1-3), the sand and gravel conveying blade (1-4), the mixing blade (1-5), and the conveying blade (1-7) are arranged in sequence; the hopper is fixed to the rear end of the cylinder (1-13); the hopper includes a cement hopper (1-11) and a sand and gravel hopper (1-12); the pushing vortex... The device (1-9) includes an inner swirling tube (1-9-1), an outer swirling tube (1-9-2), and a pusher blade (1-9-3). The rear end of the inner swirling tube (1-9-1) is fitted inside the air outlet of the main shaft (1-1). A spiral groove (1-9-4) is provided on the outer wall of the inner swirling tube (1-9-1). The outer swirling tube (1-9-2) is fitted onto the inner swirling tube (1-9-1). Air from the air outlet of the main shaft (1-1) flows through the inner swirling tube (1-9-1). 9-1) The spiral groove (1-9-4) at the rear end enters and exits from the spiral groove (1-9-4) at the front end, forming a spiral wind; one path passes through the inside of the inner vortex tube (1-9-1) and exits from the front end of the outer vortex tube (1-9-2), forming a direct current wind; the pushing blade (1-9-3) is fixed on the outer wall of the outer vortex tube (1-9-2) for pushing and dispersing materials; the outer vortex tube (1-9-2) is supported by the support seat (1-8); the concrete mixer also includes a loading robot (4), the bottom of which is fixed on the vehicle body (2); the loading robot (4) is used to feed cement and sand into the hopper; The cement conveying blade (1-3) is located directly below the cement hopper (1-11), and the sand and gravel conveying blade (1-4) is located directly below the sand and gravel hopper (1-12). The pitch of the sand and gravel conveying blades (1-4) is greater than the pitch of the cement conveying blades (1-3), and they are designed in a certain proportion. The stirring blades (1-5) consist of left-handed and right-handed blades, which are arranged in a cross pattern. The height of the right-handed blades is greater than that of the left-handed blades, which facilitates stirring and conveying materials forward simultaneously. The shrinkage inlet (1-10) is conical in shape, with the large opening fixedly connected to the front end of the cylinder (1-13) and the small opening serving as the discharge outlet (7).

2. The mining concrete mixing and spraying machine according to claim 1, characterized in that, The main body (1) of the mixer also includes an atomizing nozzle (1-6), which is located on the cylinder (1-13) and is used to supply water to the mixture between the mixing blades (1-5).

3. The mining concrete mixing and spraying machine according to claim 1, characterized in that, The transmission device includes a main sprocket (5), a driven sprocket (1-2), and a hydraulic motor (6). The driven sprocket (1-2) is sleeved on the rear end of the main shaft (1-1). The hydraulic motor (6) is connected to the main sprocket (5).

4. The mining concrete mixing and spraying machine according to claim 1, characterized in that, The concrete mixer also includes a hydraulic pump station (3), which is mounted on the vehicle body (2) to provide power to the concrete mixer.

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