Efficient placement system and method suitable for low-slump concrete with large-size aggregate

Abstract

The present invention belongs to the technical field of concrete pouring. Disclosed are an efficient placement system and method suitable for low-slump concrete with large-size aggregate. The present invention comprises an upper lock head conveying unit and a lower lock head conveying unit which are mutually symmetrically arranged at an upper lock head position and a lower lock head position of a navigation lock hub body, respectively. Each of the upper lock head conveying unit and the lower lock head conveying unit comprises a main conveying line and three branches, wherein the main conveying line is composed of six stages of belt conveyors connected end-to-end in a longitudinal direction at different heights; the three branches are spaced apart from each other at the rear outer side of the main conveying line; each branch is composed of a belt conveyor; two stages of distributing mechanisms are provided on a side corresponding to each branch; and each stage of distributing mechanism is composed of three distributing machines spaced apart from each other. The present invention improves the placement efficiency of low-slump concrete with large-size aggregate, ensures the quality of large-volume concrete during pouring, shortens the construction period, and reduces the cost.

Description

High-efficiency stockpiling system and method for large-particle-size aggregate low-slump concrete TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete pouring, in particular to a high-efficiency stockpiling system and method for large-particle-size aggregate low-slump concrete. BACKGROUND

[0002] To ensure the construction quality of large-scale concrete projects, key projects generally use low-slump, large-particle-size aggregate concrete for construction. Lower slump and larger aggregate particle size can easily cause equipment blockage and adversely affect the pouring efficiency of on-site concrete. Generally, aggregate particle sizes exceeding 80 mm are referred to as large particle sizes, and slump less than 10 cm is referred to as low slump. The lower the slump, the greater the viscosity of the concrete, and the more likely it is to cause blockage of the stockpiling equipment. Traditional concrete tank trucks have very poor practicality for large-particle-size aggregate low-slump concrete, and the stockpiling method of crane lifting a horizontal tank for stockpiling has low efficiency.

[0003] Lower stockpiling efficiency can cause loss of concrete slump, i.e., the longer the transport distance and time of the concrete mixing and transport truck, the greater the loss of concrete slump due to chemical reactions, water evaporation, aggregate water absorption, and other reasons. On the other hand, it can also cause aggregate separation, affecting the quality of the concrete.

[0004] Therefore, improving the stockpiling efficiency of large-particle-size aggregate low-slump concrete, achieving rapid and continuous stockpiling of mass concrete, and thus ensuring the pouring quality of large-particle-size aggregate low-slump concrete, shortening the construction period, and reducing construction costs are the focus of concrete construction. SUMMARY

[0005] The purpose of the present application is to provide a high-efficiency stockpiling system and method for large-particle-size aggregate low-slump, large-particle-size aggregate, low-slump concrete that is easy to implement, has a scientific and reasonable structure design, improves the stockpiling efficiency of large-particle-size aggregate low-slump concrete, ensures the quality of mass concrete during pouring, shortens the construction period, and reduces costs.

[0006] In order to achieve the above object, the application provides the following technical scheme: the high-efficiency warehousing system suitable for large-granularity aggregate low-slump concrete, which comprises an upper lock head conveying unit and a lower lock head conveying unit symmetrically arranged at the upper lock head position and the lower lock head position of the lock hub main body respectively, the upper lock head conveying unit and the lower lock head conveying unit each comprise a main conveying line and three branches, the main conveying line is composed of six-stage belt conveying mechanisms with the head and tail high and low connected in the longitudinal direction, three branches are arranged at the rear position outside the main conveying line, each branch is composed of a belt conveying mechanism, and two-stage distributing mechanisms are arranged on the side corresponding to each branch, each stage of the distributing mechanism is composed of three distributing mechanisms arranged at intervals.

[0007] Preferably, the belt conveyor comprises a belt conveyor column, a belt conveyor body, a protective cover mounting frame and a protective cover, the upper part of the belt conveyor column is provided with the belt conveyor body, the protective cover mounting frame is arranged on both sides of the belt conveyor body along the length direction of the belt conveyor body, the protective cover is arranged on the top of the protective cover mounting frame, and the protective cover comprises a rock wool board with a folded line-shaped cross section, and a hip tile is arranged at the top corner of the rock wool board.

[0008] Preferably, the distributing mechanism comprises a distributing mechanism column and a rotary distributing mechanism body arranged on the distributing mechanism column, and the distributing mechanism column is a three-stage lifting column.

[0009] Preferably, the main conveying line further comprises a buffer tube group, the tail end discharge port of the fourth-stage, fifth-stage and sixth-stage belt conveyors is provided with a downwardly extending buffer tube group, the buffer tube group comprises a buffer tube, the buffer tube comprises an upper straight cylinder section, a rhombic buffer section and a lower straight cylinder section, the rhombic buffer section is composed of two branch cylinders with the tail end of one branch cylinder being connected to the head of the other branch cylinder, the upper straight cylinder section is arranged in communication above the rhombic buffer section, and the lower straight cylinder section is arranged in communication below the rhombic buffer section.

[0010] Preferably, the buffer tube group further comprises a connecting tube, the lower end of the connecting tube is integrally provided with a connecting tube, the connecting tube and the upper straight cylinder section of the buffer tube are connected in extension, the outer side of the upper end of the upper straight cylinder section of the buffer tube is rotatably connected with an outer tube, and the first spring is connected between the outer tube and the outer side of the connecting tube.

[0011] Preferably, a spiral guide groove is formed in the outer wall of the connecting tube, and the inner wall of the upper straight cylinder section of the buffer tube is embeddedly provided with a ball, and the ball rolls along the guide groove in the lifting process of the buffer tube to drive the buffer tube to rotate synchronously in the lifting process.

[0012] Preferably, the outer side of the connecting pipe is fixedly connected with a second rubber capsule, the upper end of the second rubber capsule is fixedly connected with a first rubber capsule, the upper end of the first rubber capsule is fixedly connected to the inner wall of the upper end of the outer pipe, the first rubber capsule and the second rubber capsule are both annular structures, and the first rubber capsule and the second rubber capsule are squeezed during the lifting and adjusting of the connecting pipe and the outer pipe.

[0013] Preferably, the lower end of the second rubber capsule is connected with an exhaust pipe, the inner side of the exhaust pipe is fixedly provided with an annular partition plate, the hole of the annular partition plate is sealingly connected with a circular truncated cone-shaped sealing plug, the sealing plug and the annular partition plate are elastically connected through a second spring, the pipe opening of the exhaust pipe faces the inner side of the connecting pipe, high-pressure gas discharged from the exhaust pipe realizes the unblocking of the buffer pipe, and the outer side of the second rubber capsule is further connected with a one-way air inlet pipe.

[0014] Preferably, the rhombic opening bottom of the rhombic buffer section of the buffer pipe is provided with a vibrating mouth, a vibrating rod is connected to the vibrating mouth, a third spring is connected between the vibrating rod and the rhombic buffer section, the lower end of the rhombic buffer section of the buffer pipe is elastically rotationally connected with a rotating ring through a frame body, the outer side of the rotating ring is provided with a cable, the upper end of the cable is fixedly connected to the upper end of the connecting pipe, the other end of the cable is fixedly connected to the upper end of the vibrating rod after penetrating through the rotating ring, and the end of the vibrating rod is provided with a pressure sensor.

[0015] The application relates to a high-efficiency stockyard method suitable for large-diameter aggregate low-slump concrete.

[0016] Step 1: According to the actual working condition, the concrete demand of each pouring point is obtained, and the route of the belt conveyor in the main conveying line and branch line, the layout area of the machine head of the distributing machine and the construction range are matched.

[0017] Step 2: According to the specific situation of the construction area, the conveying level of the belt conveyor is set to ensure that the route from the pouring point to the feeding port of the distributing machine is the shortest and the level is the least; for example, the conveying route of the upper gate head needs to select a route that does not affect the construction area of the discharge gate, and the position of the distributing machine needs to select a position that maximally covers the horizontal area.

[0018] Step 3: The distributing machine can be stretched and contracted according to the size of the concrete stockyard surface, and the distributing range can be adjusted through rotation, so that the continuous and uniform pouring of the three-grade normal concrete in the area with a horizontal radius of 25m can be realized.

[0019] Step 4: The distributing system of the belt conveyor is provided with a heightening function, and the heightening function can be realized according to the height of the pouring stockyard surface, the heightening height of each level is 15m, and the maximum pouring height is 60m.

[0020] Step 5, the automatic electrical device of the tape machine distribution system is arranged, the stable operation of the tape machine in the system can be realized, meanwhile, high-frequency cameras are arranged at the concrete conveying end of the belt conveyor and the discharge port of the distribution machine, the conveying form of the belt conveyor conveying concrete and the state of the concrete are high-definition photographed, and then the loss amount and quality of the concrete in the process that the belt conveyor conveys the concrete are evaluated.

[0021] Compared with the prior art, the beneficial effects of the present application are:

[0022] 1. The method can improve the concrete storage efficiency, shorten the concrete transportation distance, improve the concrete transportation efficiency, reduce the personnel and mechanical equipment investment cost, improve the concrete construction quality, that is, reduce the concrete slump loss and concrete water loss, thereby improving the concrete vibration quality, the method has low demand on the site area of the construction site, can spare the site to organize other construction, is green, low-carbon, energy-saving and environment-friendly;

[0023] 2. The present application can effectively buffer and convey the concrete in the pipeline under high-fall conveying environment, avoid the influence of too fast falling speed on the subsequent normal conveying of the material, and can automatically clear the blockage in multiple ways while buffering the material, so as to avoid the blockage of the pipe fitting and affect the normal conveying of the concrete.

[0024] 3. The present application has the advantages of scientific and reasonable design, improving the storage efficiency of three-grade mixing low-slump concrete, ensuring the slump of three-grade mixing concrete during pouring, and being easy to implement, and is a three-grade mixing low-slump concrete efficient storage method suitable for ship lock hub projects with high innovation. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a schematic diagram of the first installation of the conveying unit of the present application;

[0026] Fig. 2 is a schematic diagram of the final installation of the conveying unit of the present application;

[0027] Fig. 3 is a schematic diagram of the first installation of the distribution machine of the present application;

[0028] Fig. 4 is a schematic diagram of the first lifting of the distribution machine of the present application;

[0029] Fig. 5 is a schematic diagram of the second lifting of the distribution machine of the present application;

[0030] Fig. 6 is a schematic diagram of the third lifting of the distribution machine of the present application;

[0031] Fig. 7 is a schematic diagram of the installation structure of the belt machine body and the protective cover installation frame of the present application;

[0032] Fig. 8 is a schematic diagram of the installation structure of the buffer pipe group of the present application;

[0033] Figure 9 is a schematic diagram of the main structure of the buffer tube assembly of the present invention;

[0034] Figure 10 is a schematic diagram of the main cross-sectional structure of the buffer tube assembly of the present invention;

[0035] Figure 11 is a cross-sectional view of the connecting pipe and outer pipe of the present invention;

[0036] Figure 12 is a schematic diagram of the connection structure of the connecting pipe and the connecting tube of the present invention;

[0037] Figure 13 is a schematic cross-sectional view of the second rubber bladder of the present invention;

[0038] Figure 14 is an enlarged structural schematic diagram of point A in Figure 13 of the present invention;

[0039] Figure 15 is a schematic diagram of the rotating ring mounting structure of the present invention;

[0040] Figure 16 is a schematic diagram of the installation structure of the vibrating rod of the present invention;

[0041] Figure 17 is a flow chart of the casting process of the present invention.

[0042] In the diagram: 1. Belt conveyor; 101. Belt conveyor column; 102. Belt conveyor body; 103. Protective cover mounting bracket; 104. Protective cover; 2. Concrete placing boom; 201. Concrete placing boom column; 202. Rotary concrete placing boom body; 3. Buffer pipe assembly; 301. Connecting pipe; 302. Connecting pipe; 303. Buffer pipe; 304. Outer pipe; 305. First spring; 306. Guide groove; 307. Ball bearing; 308. First rubber bladder; 309. Elastic rubber bladder; 310. Second rubber bladder; 311. Exhaust pipe; 312. Annular partition; 313. Sealing plug; 314. Second spring; 315. One-way air inlet pipe; 316. Vibrator; 317. Third spring; 318. Rotating ring; 319. Cable. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1: Please refer to Figures 1-8 and 17. In the prior art, concrete mixer trucks are extremely impractical for concrete with large-diameter aggregates and low slump, while the method of lifting the horizontal mixer into the formwork by crane is inefficient.

[0045] Lower storage efficiency on the one hand will cause the loss of concrete slump, that is, the longer the concrete mixing truck transport distance and time, the longer the concrete slurry due to chemical reaction, water evaporation, aggregate water absorption and other reasons, resulting in concrete slump loss over time; On the other hand, it will also cause the phenomenon of aggregate separation, affecting the quality of concrete, in order to solve this technical problem, the embodiment discloses the following technical content;

[0046] The high-efficiency storage system suitable for large-particle-size aggregate low-slump concrete comprises an upper lockage head conveying unit and a lower lockage head conveying unit which are symmetrically arranged at the upper lockage head position and the lower lockage head position of the lockage hub main body respectively, and each of the upper lockage head conveying unit and the lower lockage head conveying unit comprises one main conveying line and three branches.

[0047] The belt conveyor 1 comprises a belt conveyor column 101, a belt conveyor body 102, a protective cover mounting frame 103 and a protective cover 104, the upper part of the belt conveyor column 101 is provided with the belt conveyor body 102, the two sides of the belt conveyor body 102 are provided with the protective cover mounting frame 103 along the length direction of the belt conveyor body 102, the top of the protective cover mounting frame 103 is provided with the protective cover 104, and the protective cover 104 comprises a rock wool board with a folded line-shaped cross section, and a ridge tile is arranged at the top corner of the rock wool board.

[0048] The distributing machine 2 comprises a distributing machine column 201 and a rotary distributing machine body 202 arranged on the distributing machine column 201, and the distributing machine column 201 is a three-stage lifting column.

[0049] The high-efficiency storage method suitable for large-particle-size aggregate low-slump concrete comprises the following steps.

[0050] Step 1, according to the actual working condition, the concrete demand of each pouring point is obtained, and the route of the belt conveyor 1 in the main conveying line and the branch, the layout area of the distributing machine 2 head and the construction range are matched.

[0051] Step 2, according to the specific situation of the construction area, the conveying level of the belt conveyor 1 is set to ensure that the route from the pouring point to the distributing machine 2 feeding port is the shortest and the level is the least; for example, the conveying route of the upper lockage head needs to select the route which does not affect the construction area of the sluice, and the position of the distributing machine 2 needs to select the position which has the largest horizontal coverage area.

[0052] Step 3, the distributing machine 2 can be stretched and contracted according to the size of the concrete storage surface, and the distributing range can be adjusted by rotation, so that the continuous and uniform pouring of the three-grade normal concrete in the area with a horizontal radius of 25 m can be realized.

[0053] Step 4, the tape machine material distribution system sets the height function, which can realize the hierarchical heightening function according to the height of the pouring bin surface, and each level of heightening is 15 m, and the maximum pouring height is 60 m.

[0054] Step 5, the tape machine material distribution system sets the automatic electrical device, which can realize the stable operation of the belt conveyor in the system. Meanwhile, high-frequency cameras are arranged at the concrete conveying end of the belt conveyor 1 and the discharge port of the material distributor 2 to take high-definition photos of the conveying form of the belt conveyor 1 and the state of the concrete, and then evaluate the loss and quality of the concrete during the conveying process of the belt conveyor 1.

[0055] The pouring area is divided into the upper and lower gate heads, and two concrete conveying routes are arranged according to the main pouring points. After the concrete is poured into the hopper by the concrete truck, it is conveyed to the pouring point by the belt conveyor 1 level by level. The pouring point is provided with the material distributor 2, which can extend and rotate to adjust the distribution range according to the size of the concrete bin surface, so as to meet the continuous and uniform pouring and distribution of 1-4 grade normal concrete in the area with a radius of 25 m and a height of 15 m. After the concrete in the 15 m high area is poured, the material distributor stand 201 is continued to be used until the maximum pouring height of 60 m is reached.

[0056] The main conveying route includes:

[0057] Upper gate head: one main conveying route, three branches, a total of nine belt conveyors 1, and six material distributors 2.

[0058] Lower gate head: one main conveying route, three branches, a total of nine belt conveyors 1, and six material distributors 2.

[0059] The pouring process of the upper and lower gate heads is to arrange one concrete conveying line, and the total length of the conveying line is 364 meters, of which the main line length is 314 meters, which is composed of six belt conveyors 1, and the maximum span of the belt conveyor 1 is 49.5 meters. In order to ensure that the distribution range of the material distributor 2 can cover the entire gate head area and reduce the number of belt conveyors 1, the material distributor 2 is arranged in two levels. The concrete is conveyed to the first level material distributor 2 by the belt conveyor 1, and the first level material distributor 2 uses the cantilever to feed to the second level material distributor 2, so that the distribution range covers the entire gate head.

[0060] The installation height of the belt conveyor 1 is generally divided into one-time installation and one-time lifting. The belt conveyor 1 is first installed to a specified height of 40 m, and is lifted once to a design height of 68 m.

[0061] The installation height of the material distributor 2 is generally divided into one-time installation and three-time lifting. The material distributor 2 is first installed to a specified height of 15 m, and is lifted twice by 15 m each time, and finally lifted to a design height of 58 m.

[0062] The technical content disclosed in this embodiment is a further improvement based on the above-mentioned embodiment one. Although the existing concrete storage system is provided with a buffer mechanism to buffer the high-fall conveying material, the buffer mechanism lacks a certain anti-blocking structure, so that the material is easy to accumulate and block the pipeline after buffering and deceleration. In order to further solve this technical problem, the technical content disclosed in this embodiment is as follows, as shown in FIGS. 9-16.

[0063] The main conveying line further comprises a buffer pipe group 3, and the tail end discharge outlets of the fourth, fifth and sixth stage belt conveyors 1 are all provided with downwardly extending buffer pipe groups 3, and the buffer pipe group 3 comprises a buffer pipe 303, and the buffer pipe 303 comprises an upper straight cylinder section, a rhombic buffer section and a lower straight cylinder section, the rhombic buffer section is composed of two branch cylinders which are butt-jointed at the head and tail, the upper straight cylinder section is communicatively arranged above the rhombic buffer section, and the lower straight cylinder section is communicatively arranged below the rhombic buffer section.

[0064] The buffer pipe group 3 further comprises a connecting pipe 301, and the lower end of the connecting pipe 301 is integrally provided with a connecting pipe 302, and the connecting pipe 302 and the upper straight cylinder section of the buffer pipe 303 are telescopically connected, and the upper end outer side of the upper straight cylinder section of the buffer pipe 303 is rotatably connected with an outer pipe 304, and the outer pipe 304 and the outer side of the connecting pipe 301 are connected with a first spring 305.

[0065] The outer wall of the connecting pipe 302 is provided with a spiral guide groove 306, and the inner wall of the upper straight cylinder section of the buffer pipe 303 is embeddedly installed with a ball 307, and the ball 307 rolls along the guide groove 306 in the lifting process of the buffer pipe 303 to drive the buffer pipe 303 to rotate synchronously in the lifting process.

[0066] The second rubber capsule 310 is fixedly bonded above the outer side partition plate of the connecting pipe 301, the upper end of the second rubber capsule 310 is fixedly bonded with the first rubber capsule 308, the upper end of the first rubber capsule 308 is fixedly bonded to the inner wall of the upper end of the outer pipe 304, the first rubber capsule 308 and the second rubber capsule 310 are both provided in an annular structure, the connecting pipe 301 and the outer pipe 304 are squeezed against the first rubber capsule 308 and the second rubber capsule 310 in the lifting and adjusting process, the inner side of the connecting pipe 301 is embeddedly installed with an annular elastic rubber capsule 309, the elastic rubber capsule 309 and the first rubber capsule 308 are connected through a pipeline, and the elastic rubber capsule 309 realizes the plugging of the pipe hole of the connecting pipe 301 after inflation.

[0067] The lower end of the second rubber capsule 310 is connected with an exhaust pipe 311, and the inner side of the exhaust pipe 311 is fixedly provided with an annular partition plate 312, and the hole of the annular partition plate 312 is sealingly connected with a circular truncated cone-shaped sealing plug 313, and the sealing plug 313 and the annular partition plate 312 are elastically connected through a second spring 314, the pipe opening of the exhaust pipe 311 is towards the inner side of the connecting pipe 301, and the high-pressure gas discharged by the exhaust pipe 311 realizes the clearing of the buffer pipe 303, and the outer side of the second rubber capsule 310 is also connected with a one-way air inlet pipe 315.

[0068] The rhombic opening bottom of the rhombic buffer section of the buffer pipe 303 is provided with a vibrating hole, and a vibrating rod 316 is connected in the vibrating hole, and the vibrating rod 316 and the rhombic buffer section are connected through a third spring 317, and the lower end of the rhombic buffer section of the buffer pipe 303 is elastically rotationally connected with a rotating ring 318 through a frame body, the outer side of the rotating ring 318 is provided with a cable 319, and the upper end of the cable 319 is fixedly connected to the upper end of the connecting pipe 301, and the other end of the cable 319 is fixedly connected to the upper end of the vibrating rod 316 after penetrating through the rotating ring 318, and the end of the vibrating rod 316 is provided with a pressure sensor.

[0069] When the concrete enters the buffer pipe group 3, the buffer pipe 303 can buffer the concrete, and the upper straight section of the buffer pipe 303 will be in telescopic adjustment with the connecting pipe 302 under the impact of the concrete, at this time the first spring 305 will be stretched, so as to further improve the buffering effect and avoid the buffer pipe 303 from being accelerated to wear out due to excessive force in an instant, and with the telescopic adjustment of the upper straight section of the buffer pipe 303 and the connecting pipe 302, the rolling ball 307 on the inner wall of the upper straight section can roll along the spiral guide groove 306 formed on the outer wall of the connecting pipe 302, so that the buffer pipe 303 can be synchronously rotated during the lifting adjustment, thereby reducing the residual rate of the concrete in the buffer pipe 303;

[0070] When the buffer tube 303 is blocked, the pressure sensor at the lower end of the vibrating rod 316 detects the pressure change, and the vibrating rod 316 is automatically started to vibrate and loosen the concrete at the blocked position, and the buffer tube 303 gradually increases the gravity after being blocked, so that it drives the outer tube 304 to further move downward. At this time, the outer tube 304 will extrude the first rubber capsule 308 and the second rubber capsule 310 through the baffle outside the connecting tube 301, so that the first rubber capsule 308 will deliver the gas inside to the inside of the elastic rubber capsule 309 through the pipeline after being pressed, so that the elastic rubber capsule 309 expands, thereby blocking the connecting tube 301. At the same time, when the internal gas pressure of the second rubber capsule 310 is too high, it will push the sealing plug 313 in the exhaust pipe 311 to move elastically, realize automatic high-speed pressure relief, and inject gas into the inside of the buffer tube 303, so that the gas pressure in the buffer tube 303 is increased, thereby pushing the concrete blocked at the lower part of the buffer tube 303 to be discharged, and cooperating with the vibrating rod 316 to realize efficient unblocking. During the downward movement of the buffer tube 303, the inhaul cable 319 pulls the vibrating rod 316 to rotate, so that the upper end of the vibrating rod 316 is close to the inner wall of the rotating ring 318. With the continuous pulling of the inhaul cable 319, the inhaul cable 319 wound outside the rotating ring 318 can be unwound, thereby driving the rotating ring 318 and the vibrating rod 316 to rotate and swing, thereby effectively expanding the unblocking range of the vibrating rod 316. When the unblocking is completed, the rotating ring 318 and the vibrating rod 316 will be reset under the elastic force of the torsional spring and the third spring 317, and the buffer tube 303 will move upward under the elastic force of the first spring 305, and rotate to realize auxiliary cleaning of the inner wall of the buffer tube 303, so as to avoid the solidification of too much concrete remaining on the inner wall.

[0071] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0072] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments, or make equivalent replacements for part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A high-efficiency placement system for low-slump concrete with large-diameter aggregates, comprising an upper lock head conveying unit and a lower lock head conveying unit symmetrically arranged at the upper and lower lock head positions of the main body of the lock hub, characterized in that: The upper gate head conveying unit and the lower gate head conveying unit each include a main conveying line and three branch lines. The main conveying line is composed of six-stage belt conveyors (1) connected at different heights at the beginning and end in the longitudinal direction. Three branch lines are set at intervals on the outer rear side of the main conveying line. Each branch line is composed of belt conveyors (1). Two-stage material placement mechanisms are set on the side corresponding to each branch line. Each material placement mechanism is composed of three material placement machines (2) set at intervals. The main conveying line also includes a buffer pipe group (3), and the fourth, fifth and sixth stage belt conveyors (1) are all provided with downward-extending buffer pipe groups (3) below the tail discharge port. The buffer pipe group (3) includes a buffer pipe (303), and the buffer pipe (303) includes an upper straight section, a diamond-shaped buffer section and a lower straight section. The diamond-shaped buffer section is composed of two support cylinders that are connected end to end. An upper straight section is connected above the diamond-shaped buffer section, and a lower straight section is connected below the diamond-shaped buffer section. The buffer tube assembly (3) also includes a connecting tube (301), and the lower end of the connecting tube (301) is integrally provided with a connecting tube (302). The connecting tube (302) and the upper straight section of the buffer tube (303) are telescopically connected. At the same time, the outer side of the upper straight section of the buffer tube (303) is rotatably connected with an outer tube (304), and a first spring (305) is connected between the outer tube (304) and the outer side of the connecting tube (301). The bottom of the rhomboid opening of the rhomboid buffer section of the buffer tube (303) is provided with a vibration port, and a vibrating rod (316) is connected to the ball inside the vibration port. A third spring (317) is connected between the vibrating rod (316) and the rhomboid buffer section. Meanwhile, the lower outer side of the rhomboid buffer section of the buffer tube (303) is elastically rotatably connected to a rotating ring (318) through the frame. A cable (319) is wound around the outer side of the rotating ring (318). The upper end of the cable (319) is fixedly connected to the upper end of the connecting tube (301). The other end of the cable (319) passes through the rotating ring (318) and is fixedly connected to the upper outer side of the vibrating rod (316). A pressure sensor is provided at the end of the vibrating rod (316). The outer wall of the connecting pipe (302) is provided with a spiral guide groove (306), and a ball bearing (307) is embedded in the inner wall of the upper straight section of the buffer pipe (303). The ball bearing (307) rolls along the guide groove (306) during the lifting and lowering of the buffer pipe (303) to drive the buffer pipe (303) to rotate synchronously during the lifting and lowering process.

2. The efficient placement system for low-slump concrete with large-diameter aggregates according to claim 1, characterized in that: The belt conveyor (1) includes a belt conveyor column (101), a belt conveyor body (102), a protective cover mounting frame (103), and a protective cover (104). The belt conveyor body (102) is installed on the upper part of the belt conveyor column (101), and the protective cover mounting frame (103) is provided on both sides of the belt conveyor body (102) along its length. The protective cover (104) is laid on the top of the protective cover mounting frame (103), and the protective cover (104) includes a rock wool board with a zigzag cross section. A ridge tile is provided at the top corner of the rock wool board.

3. The efficient placement system for low-slump concrete with large-diameter aggregates according to claim 1, characterized in that: The placing machine (2) includes a placing machine column (201) and a rotary placing machine body (202) installed on the placing machine column (201), and the placing machine column (201) is a three-stage lifting column.

4. The efficient placement system for low-slump concrete with large-diameter aggregates according to claim 1, characterized in that: A second rubber bladder (310) is fixedly bonded to the upper part of the outer partition of the connecting pipe (301), and a first rubber bladder (308) is fixedly bonded to the upper end of the second rubber bladder (310). The upper end of the first rubber bladder (308) is fixedly bonded to the upper inner wall of the outer pipe (304). Both the first rubber bladder (308) and the second rubber bladder (310) are annular structures. During the lifting and lowering adjustment of the connecting pipe (301) and the outer pipe (304), the first rubber bladder (308) and the second rubber bladder (310) are squeezed. An annular elastic rubber bladder (309) is embedded and installed on the inner side of the connecting pipe (301). The elastic rubber bladder (309) and the first rubber bladder (308) are connected through a pipe. After the elastic rubber bladder (309) is inflated, it can seal the pipe hole of the connecting pipe (301).

5. The efficient placement system for low-slump concrete with large-diameter aggregates according to claim 4, characterized in that: The lower end of the second rubber bladder (310) is connected to an exhaust pipe (311), and an annular partition (312) is fixedly provided on the inner side of the exhaust pipe (311). A frustum-shaped sealing plug (313) is sealed in the hole of the annular partition (312). At the same time, the sealing plug (313) and the annular partition (312) are elastically connected by a second spring (314). The opening of the exhaust pipe (311) faces the inner side of the connecting pipe (301), and the high-pressure gas discharged from the exhaust pipe (311) clears the blockage in the buffer pipe (303). A one-way air inlet pipe (315) is also connected to the outer side of the second rubber bladder (310).

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