A concrete pumping system

Abstract

The application discloses a concrete pumping system, which comprises a storage bin, a pumping pipe for lifting concrete upwards is connected to the storage bin in a sealed mode, the pumping pipe is arranged in a closed loop mode, and a discharge pipe with a valve body is arranged at different elevations of the pumping pipe. A conveying chain is integrated in the pumping pipe, a pushing unit and a pushing material unit are intermittently engaged, a vertical sliding extrusion rod is radially clamped to the chain body under the action of an extrusion table, and two-stage power transmission is formed in cooperation, so that the conveying chain is ensured to move in the pipe body without blockage, and the transmission effect is obviously improved. The application can improve the lifting efficiency of concrete, avoid coarse aggregate from being stuck in the chain link, and reduce equipment maintenance.

Description

Technical Field

[0001] This invention relates to the field of mining engineering construction technology, specifically to a concrete pumping system for lifting concrete slurry upwards. Background Technology

[0002] Concrete is highly viscous and easily solidifies and deforms during transportation. It tends to stick to the walls of mixing equipment or pumping pipes during transport, gradually accumulating and clogging as the equipment rotates, thus preventing normal operation. Mine concrete construction often involves complex terrain, including pits and steep slopes, requiring pumping equipment with both long-distance vertical lifting capabilities and terrain adaptability. Furthermore, the relatively open construction environment in mines accelerates moisture evaporation and hydration reactions, significantly shortening the workable time of the concrete.

[0003] Current mainstream solutions have obvious drawbacks: using concrete mixer trucks to transport concrete to the base station and maintaining fluidity through a mixer results in high energy consumption and cannot solve the problem of long-distance pumping and solidification; traditional tubular chain conveyors rely on sprocket drives, and the gaps between chain links are easily jammed by coarse aggregates, causing increased chain wear, reduced transmission efficiency, and even causing conveying jams and interruptions. Summary of the Invention

[0004] This invention proposes a concrete pumping system, the purpose of which is to solve the problems of low efficiency and easy wear of sprocket drive in existing concrete pipe chain conveyors, as well as the problem that coarse aggregate is easily stuck in the chain links, causing conveying jams or even interruptions, thus affecting conveying efficiency.

[0005] The technical solution of this invention is as follows:

[0006] A concrete pumping system includes a storage silo with a pumping pipe for lifting concrete into the silo in a closed loop. Discharge pipes with valves are located at different elevations along the pumping pipe. A conveying chain is integrated within the pumping pipe. The conveying chain consists of a continuous, smooth chain body with multiple pushing units equidistantly connected to it, each corresponding to the inner diameter of the pumping pipe. These pushing units can propel concrete through the pumping pipe under the drag of the chain body. The system also includes a drive mechanism for moving the conveying chain. The drive mechanism includes two coaxially arranged drive wheels with multiple corresponding propulsion units slidably mounted vertically on them. The engagement stroke of the propulsion units corresponds to the interval between the pushing units.

[0007] As a further improvement of the present invention, the storage silo is provided with a spiral lifting mechanism for lifting concrete to the high-level discharge port of the silo body, and the high-level discharge port is connected to the inlet of the pumping pipe.

[0008] As a further improvement of the present invention, the driving mechanism also includes a housing, and an inwardly protruding extrusion platform is provided on the inner wall of the housing at a position corresponding to the chain body. The inner end face of the extrusion platform is an extrusion surface, and the upper and lower edges of the extrusion surface are provided with inclined surfaces. An extrusion rod slides through the driving wheel along its transmission shaft direction. The outer end of the extrusion rod passes through the driving wheel and is connected to a limiting member. A return spring is sleeved between the driving wheel and the limiting member.

[0009] As a further improvement of the present invention, the inner end of the extrusion rod is provided with an extrusion plate that contacts the chain body. The extrusion plate is provided with a concave-convex structure for increasing friction, and the orientation of the concave-convex structure does not coincide with the travel direction of the chain body.

[0010] As a further improvement of the present invention, the inner wall of the upper section of the pumping pipe is provided with a drive rail extending longitudinally along the pipe body, and the drive rail is S-shaped or wavy; the edge of the pushing unit is provided with a groove that cooperates with the drive rail.

[0011] As a further improvement of the present invention, the top surface of the pushing unit is provided with a plurality of pushing parts protruding in the direction of concrete conveying along the radial direction.

[0012] As a further improvement of the present invention, the pushing unit is connected to the chain body through a connector, the connector is connected to the pushing unit, and the plane of action of the pushing unit does not intersect with the motion trajectory of the connector.

[0013] As a further improvement of the present invention, the connecting member is a universal hinge structure or a tie rod structure.

[0014] As a further improvement of the present invention, the chain is a steel wire rope; the chain is disposed between the two drive wheels and offset to the outside of the center of the drive wheels.

[0015] As a further improvement of the present invention, the driving mechanism is one or more, respectively disposed above the discharge pipe of the pumping pipe or the return section of the conveyor chain.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] (1) The pipe chain conveying device of this system can realize the quantitative and controllable conveying of concrete and effectively prevent the concrete in the pumping pipe from being overloaded. The conveying chain body adopts a high-strength steel wire rope structure. Its continuous smooth surface can significantly reduce the frictional resistance with the concrete and prevent coarse aggregate from getting stuck between the chain links, thus ensuring the continuity of conveying. At the same time, through the intermittent meshing of the propulsion unit and the pusher unit, and the vertical sliding extrusion rod, the chain body is radially clamped under the action of the extrusion table to form a two-stage power transmission, ensuring the unobstructed movement of the conveying chain in the pipe body and significantly improving the transmission effect.

[0018] (2) This system forms a forced rotation pair with the S-shaped drive rail on the inner wall of the upper section of the pumping pipe and the edge groove of the pushing unit. During the rising process of the pushing unit, it generates a periodic deflection of ±15° to 25°. The radially distributed material feeding parts on its top surface mechanically mix the concrete and maintain the concrete slump for a long time.

[0019] (3) The system lifts concrete to the high discharge port on the upper part of the silo through a metal sealed storage silo and a spiral lifting mechanism built into the silo body. The discharge port is sealed to the closed-loop pumping pipe. Multiple discharge pipes with valve bodies are distributed at different elevations on the upper part of the pumping pipe to realize the segmented output of concrete.

[0020] (4) The storage silo of this system adopts a stainless steel sealed silo body. The bottom plate of the silo body is inclined to the side of the low discharge port to ensure that the concrete can flow to the low discharge port under its own weight. The concrete is conveyed upward through the built-in spiral lifting mechanism. The spiral lifting mechanism operates in a sealed environment, which can greatly suppress water evaporation and hydration reaction. The actual measurement extended the concrete setting time to more than 2.3 times that of the traditional open system, avoiding equipment failure due to setting. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a concrete pumping system according to one embodiment of this application;

[0022] Figure 2 for Figure 1 A plan view of the pumping pipe (including the drive motor);

[0023] Figure 3 for Figure 1 Schematic diagram of the internal structure of the central storage silo;

[0024] Figure 4 for Figure 3 Schematic diagram of the middle conveyor chain;

[0025] Figure 5 for Figure 4 Top view of the pusher unit;

[0026] Figure 6 for Figure 2 Schematic diagram of the drive rail structure on the inner wall of the central tube;

[0027] Figure 7 for Figure 2 A schematic diagram of the drive mechanism;

[0028] Figure 8 for Figure 7 Schematic diagram of the drive wheel structure;

[0029] Figure 9 This is a schematic diagram of the drive mechanism in another embodiment of this application;

[0030] Figure 10 for Figure 9 Schematic diagram of the drive wheel structure;

[0031] Figure 11 for Figure 9 A schematic diagram of the structure of the drive wheel and the outer shell;

[0032] Figure 12 for Figure 11 A schematic diagram showing the positional relationship between the central chain and the extrusion plate.

[0033] In the diagram, 100 is the storage bin; 101 is the lifting bin; 110 is the screw conveyor; 200 is the pumping pipe; 201 is the discharge pipe; 210 is the pipe body; 211 is the drive rail; 220 is the conveyor chain; 221 is the chain body; 222 is the pushing unit; 223 is the pull rod; 224 is the material feeding component; 225 is the groove; 230 is the drive mechanism; 231 is the drive motor; 232 is the outer shell; 2321 is the extrusion table; 2322 is the inclined plane; 2323 is the extrusion surface; 233 is the drive wheel; 234 is the propulsion unit; 235 is the extrusion rod; 2351 is the return spring; 2352 is the extrusion plate; and 2353 is the concave-convex structure. Detailed Implementation

[0034] The technical solutions and effects of the present invention will be described in detail below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Example

[0035] like Figure 1 and Figure 2 As shown, a concrete pumping system includes a storage silo 100, a pumping pipe 200, and a drive mechanism 230.

[0036] Combination Figure 3 As shown, to reduce moisture evaporation and extend the setting time of concrete, the storage silo 100 is preferably made of stainless steel. The bottom plate of the silo is inclined towards the lower discharge port at an angle of 5° to 8°, allowing the concrete to flow smoothly to the lower discharge port under its own weight. A lifting silo 101 is connected to the lower discharge port, and the lifting silo 101 is equipped with a spiral lifting mechanism 110 that can lift the concrete to the higher discharge port.

[0037] Combination Figure 4As shown, a pumping pipe 200 for lifting concrete is sealed and connected to the storage silo 100. The high-level discharge port of the storage silo 100 is connected to the inlet of the pumping pipe 200. The concrete is lifted to the high-level discharge port by a screw lifting mechanism 110, and then falls into the pumping pipe 200 for transportation under its own gravity. The entire transportation process is completely isolated from air exposure, and the measured solidification time is extended to 2.3 times that of an open system, thus avoiding the problem of accelerated hydration reaction caused by moisture evaporation in open-air environments. The pumping pipe 200 is arranged in a closed loop, and discharge pipes 201 with valves are installed at different elevations on it.

[0038] like Figure 3 As shown, a conveying chain 220 is integrated inside the pumping pipe 200. The conveying chain 220 includes a continuous and smooth chain body 221. The chain body 221 adopts a continuous and smooth steel wire rope structure with a diameter of φ12-φ16mm, which eliminates the meshing gap of traditional connections and can avoid aggregate jamming.

[0039] Combination Figure 4 As shown, multiple pushing units 222, which are adapted to the inner diameter of the pumping pipe 200, are equidistantly connected on the chain body 221. The pushing units 222 are used to push concrete within the pumping pipe 200. The pushing unit 222 is a circular steel plate with a thickness of 8 to 10 mm, and the gap between it and the inner diameter of the pipe body 210 is ≤2 mm.

[0040] Optionally, the pushing unit 222 is circular and can fit the inner wall of the tube 210, and can ensure that the force on the pushing unit 222 is uniform around its perimeter, avoiding bending or tilting that could lead to material leakage, resulting in low conveying efficiency or even partial failure of the device.

[0041] like Figure 5 As shown, the top surface of the pushing unit 222 is provided with a plurality of material feeding parts 224 protruding in the direction of concrete conveying along the radial direction. During the operation of the pushing unit 222, the material feeding parts 224 will rotate with it, promoting the fluidity of the slurry on it.

[0042] In order to maintain the balance of the pushing unit 222, increase the angle of the pushing unit 222 during the conveying process, and avoid tilting and material leakage, the pushing unit 222 is connected to the chain body 221 through multiple connectors. The upper end of the connector is fixed to the pushing unit 222, and the lower end is fixed to the chain body 221.

[0043] Specifically, there are three or four connectors. To avoid stress concentration, the connectors are universal hinge structures or tie rod 223 structures, which can automatically adjust the angle during deflection.

[0044] Furthermore, such as Figure 6As shown, the inner wall of the upper section of the pumping pipe 200, the pipe body 210, is provided with a drive rail 211 extending longitudinally along the pipe body 210. The drive rail 211 is S-shaped or wavy. The edge of the pushing unit 222 is provided with a groove 225 that mates with the drive rail 211. The drive rail 211 and the groove 225 cooperate to guide the pushing unit 222 to periodically deflect around the chain body 221 when the pushing unit 222 rises, and strictly limit its deflection motion to axial rotation. The rotation angle is controlled by the amplitude of the drive rail 211.

[0045] like Figure 5 As shown, the pusher unit 222 has multiple grooves 225 on its edge that cooperate with the drive rail 211. Under the guidance of the drive rail 211, the pusher unit 222 moves upward inside the tube 210 while periodically being forced to deflect. The deflection angle is ±15° to 25°, thereby maintaining the fluidity of the concrete on it.

[0046] like Figure 7 As shown, the drive mechanism 230 includes a drive motor 231 and two drive wheels 233 driven by the drive motor 231, the drive wheels 233 being two coaxially arranged wheels. Figure 8 As shown, multiple corresponding propulsion units 234 are vertically slidably mounted on the two drive wheels 233. Each propulsion unit 234 is a short, columnar protrusion. The force exerted by the propulsion unit 234 is always perpendicular to the plane of the pushing unit 222 and does not intersect with the movement trajectory of the connecting component. The engagement stroke of the propulsion unit 234 is consistent with the interval distance of the pushing unit 222, ensuring that the next pushing unit 222 contacts the propulsion unit 234 before the previous pushing unit 222 separates from the propulsion unit 234, thus ensuring the continuity of conveying. The corresponding propulsion units 234 on the two drive wheels 233 work together to push the bottom of the pushing unit 222 upwards, improving stability during the pushing process and preventing damage due to uneven force.

[0047] The chain 221 is positioned between the two drive wheels 233 and offset outward from the center, so that the propulsion unit 234 can act on the pusher unit 222 to drive the conveyor chain 220 to run.

[0048] As one embodiment of this application, the propulsion unit 234 has a short extension length, and its working plane does not intersect with the movement trajectory of the connector, or the end shape of the propulsion unit 234 is a fork shape to avoid the connector. Example

[0049] The only difference between this embodiment and Implementation 1 is that: Figure 9As shown, the drive mechanism 230 also includes a housing 232. The inner wall of the housing 232 is provided with an inwardly protruding extrusion platform 2321 at a position corresponding to the chain body 221. The inner end face of the extrusion platform 2321 is an extrusion surface 2323, and the upper and lower edges of the extrusion surface 2323 are provided with inclined surfaces 2322.

[0050] Combination Figure 10 As shown, a pressing rod 235 is slidably connected to the drive wheel 233 along its drive shaft direction. The outer end of the pressing rod 235 passes through the drive wheel 233 and is connected to a limiting member. Optionally, the limiting member is a copper cap or a nylon cap, with a smooth surface and low friction to prevent jamming during operation.

[0051] Combination Figure 11 As shown, a return spring 2351 is sleeved between the drive wheel 233 and the limiting member, and the return spring 2351 is always in a compressed state. When the corresponding two extrusion rods 235 rotate from bottom to top to the inclined plane 2322, they can slide upward along the inclined plane 2322 to the extrusion surface 2323. The two extrusion rods 235 push inward to clamp the chain body 221, driving it to move upward. As the extrusion rods 235 rotate to the upper inclined plane 2322, the extrusion force on the return spring 2351 gradually decreases, and the clamping force of the two extrusion rods 235 gradually decreases. As the drive wheel 233 rotates, the extrusion rods 235 pass through the extrusion table 2321 in sequence, thereby continuously pushing the conveyor chain 220 upward.

[0052] As a preferred example of the present invention, such as Figure 12 As shown, the inner end of the extrusion rod 235 is provided with an extrusion plate 2352 that contacts the chain 221. The extrusion plate 2352 is provided with a concave-convex structure 2353 for increasing friction. The orientation of the concave-convex structure 2353 does not coincide with the traveling direction of the chain 221. The laterally arranged concave-convex structure 2353 allows for horizontal displacement between the chain and the extrusion plate 2352, thereby adapting to the curvature of the drive wheel 233. That is, when moving upward, the extrusion rod 235 moves in an arc shape. The lateral displacement can offset the lateral movement error and avoid damage to the chain 221.

[0053] Using the clamping rod 235 to clamp the chain body 221 for auxiliary lifting can reduce the pressure of the pushing unit 222 on the propulsion unit 234, and avoid excessive pressure that could deform the pushing unit 222 and affect the conveying stability.

[0054] The number and installation location of the drive mechanism 230 in each embodiment of this application need to be selected according to the transportation distance and the load capacity of the conveyor chain 220. There can be one or more drive mechanisms 230, located in the concrete drainage area, such as the section above the discharge pipe 201 of the pumping pipe 200 or the return section of the conveyor chain 220. One additional drive mechanism 230 is added for every 50 meters of increasing lifting height, and the tensile strength of the chain body 221 is ≥1800MPa.

[0055] In this embodiment, the storage silo 100 is placed on a platform, the pumping pipe 200 is laid to the required position, and the drive mechanism 230 is fixed, completing the system assembly. This system can be vertically fixed to a hillside or laid on a gentle slope. The drive mechanism 230 is started, and multiple drive mechanisms 230 are adjusted to operate synchronously to ensure stable operation of the conveyor chain 220 within the pumping pipe 200. In use, a concrete mixer truck transports concrete to the storage silo 100. The screw conveyor 110 lifts the concrete to a high discharge port, which then falls into the pumping pipe 200. The conveyor chain 220 lifts it to the corresponding discharge pipe. The valve at the desired position is opened, and the concrete is discharged under its own weight, completing the concrete delivery.

[0056] This device can also be equipped with a pulse jet device to clean the residue inside the pumping pipe 200, preventing concrete from solidifying and blocking the pipe 210.

[0057] It should be noted that, as will be apparent to those skilled in the art, the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics thereof. The scope of the present invention is defined by the claims rather than the foregoing description.

Claims

1. A concrete pumping system comprising a storage bin (100) to which a pumping pipe (200) for lifting concrete upwards is connected in airtight manner, said pumping pipe (200) being arranged in a closed loop and provided at different elevations with discharge pipes (201) with valve bodies; characterized in that: A conveying chain (220) is integrated in the pumping pipe (200), the conveying chain (220) comprises a continuous smooth chain body (221), a plurality of pushing units (222) corresponding to the inner diameter of the pumping pipe (200) are connected to the chain body (221) at equal intervals, and a plurality of pushing members protruding in the direction of concrete conveying are arranged on the top surface of the pushing unit (222) in the radial direction; the pushing unit (222) can push the concrete to convey in the pumping pipe (200) under the dragging of the chain body (221); the system further comprises a driving mechanism (230) for driving the movement of the conveying chain (220); the driving mechanism (230) comprises two driving wheels (233) arranged coaxially, a plurality of corresponding pushing units (234) are vertically and slidingly arranged on the two driving wheels (233), the meshing stroke of the pushing unit matches the interval distance of the pushing unit; the pushing unit (222) is connected to the chain body (221) through a connecting piece, the connecting piece is connected to the pushing unit (222), and the acting plane of the pushing unit (234) does not intersect with the movement track of the connecting piece; The driving mechanism (230) further comprises a shell (232), an extrusion table (2321) protruding inward is arranged on the inner wall of the shell (232), and a slope (2322) is arranged on the outer edge of the extrusion table (2321); the extrusion rod (235) slidingly penetrates the driving wheel (233) in the direction of the transmission shaft of the driving wheel (233), the outer end of the extrusion rod (235) is connected to a limiting piece after penetrating the driving wheel (233), and the driving wheel (233) and the limiting piece are sleeved with a return spring (2351).

2. The concrete pumping system of claim 1, wherein: The storage bin (100) is provided with a spiral lifting mechanism for lifting the concrete to the high-position discharge port of the bin body, and the high-position discharge port is communicated with the feeding port of the pumping pipe (200).

3. The concrete pumping system of claim 1, wherein: The inner end of the extrusion rod (235) is provided with an extrusion plate (2352) in contact with the chain body (221), the extrusion plate (2352) is provided with a concave-convex structure (2353) for increasing friction, and the direction of the concave-convex structure (2353) does not coincide with the advancing direction of the chain body (221).

4. The concrete pumping system of claim 1, wherein: The inner wall of the upward segment pipe body (210) of the pumping pipe (200) is provided with a driving rail (211) extending in the longitudinal direction of the pipe body (210), and the driving rail (211) is S-shaped or wave-shaped; the edge of the pushing unit (222) is provided with a groove (225) matched with the driving rail (211).

5. The concrete pumping system of claim 1, wherein: The connecting piece is a universal hinge structure or a pull rod (223) structure.

6. The concrete pumping system of claim 1, wherein: The chain body (221) is a steel wire rope; the chain body (221) is arranged between the two driving wheels (233) and is arranged outward of the center of the driving wheel (233).

7. The concrete pumping system of any one of claims 1-6, wherein: The driving mechanism (230) is one or more, and is arranged above the discharging pipe (201) of the pumping pipe (200) or the returning section of the conveying chain (220).

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