Accurate powder metering device for concrete mixing plant

Abstract

The utility model discloses an accurate powder metering device for a concrete mixing plant, relates to the technical field of concrete mixing plants, and aims to solve the problems that the existing volumetric and gravity type powder metering is low in accuracy, easy to be influenced by impact, incapable of accurately supplementing materials and the like, the device comprises a mounting frame, and a weighing bin, a feeding cylinder and a driving motor are sequentially arranged on the mounting frame; the weighing bin is provided with a weighing sensor and a discharge valve; the feeding cylinder is connected with the weighing bin through flexible connection, the top of the feeding cylinder is in threaded connection with a transmission rod, and the bottom of the transmission rod is provided with a partition plate and rotationally connected with a blocking disc which is provided with a distribution box, an upper opening and a lower opening. The driving motor drives the transmission rod to rotate, small-dose accurate material supplementation is achieved through cooperation of the material distribution box and the partition plate, the vibration influence is reduced through flexible connection, and the isolation hood prevents powder from influencing transmission. The device can accurately meter various powder materials, and is reasonable in structure, easy and convenient to operate and suitable for various concrete mixing plants.

Description

Technical Field

[0001] This utility model relates to the field of concrete mixing plant technology, and in particular to a precise metering device for powder materials in a concrete mixing plant. Background Technology

[0002] In modern construction engineering, concrete mixing plants are the core sites for concrete production, and the quality of the concrete they produce directly affects the stability and durability of construction projects. Powder materials, including cement, fly ash, and mineral powder, are key components of concrete, and the accuracy of their metering plays a decisive role in the concrete's strength, setting time, and other performance indicators. Inaccurate powder metering not only leads to fluctuations in concrete quality, affecting project quality, but also results in powder waste and increased production costs.

[0003] Currently, the commonly used powder metering methods in concrete mixing plants are volumetric metering and gravity metering. Volumetric metering relies on containers of fixed volume to measure powder, which is greatly affected by factors such as changes in powder bulk density and differences in material flowability, making it difficult to guarantee metering accuracy. Gravity metering, although it measures the weight of material through weighing sensors, suffers from problems in actual production, such as weighing fluctuations caused by powder impact during feeding, metering deviations due to residues during unloading, and zero-point drift caused by long-term use of sensors. The powder weighing fluctuations are caused by the impact of powder falling into the weighing hopper and are closely related to the powder flow rate. Furthermore, although weighing sensors have good metering accuracy, the powder in the air cannot be measured during its fall into the weighing hopper, thus affecting accuracy. Existing powder metering devices cannot precisely control the feeding speed, making it difficult to achieve precise small-dose replenishment. With the construction industry's increasingly stringent requirements for concrete quality, there is an urgent need for a technical solution that can overcome the shortcomings of existing technologies and achieve accurate powder metering.

[0004] Therefore, this application provides a precise metering device for powder materials in a concrete mixing plant to meet the requirements. Utility Model Content

[0005] The purpose of this application is to provide a precise powder metering device for a concrete mixing plant. By setting a mechanism to adjust the powder flow rate, the impact of the powder falling can be reduced, small-dose intermittent feeding can be achieved, and the resulting weighing error can be reduced.

[0006] To achieve the above objectives, this application provides the following technical solution: a precise metering device for powder materials in a concrete mixing plant, comprising:

[0007] The mounting frame is equipped with a weighing bin, a feeding cylinder and a drive motor, which are installed sequentially from bottom to top.

[0008] A weighing sensor is installed between the weighing bin and the mounting frame. The top of the weighing bin is provided with a feed inlet, the bottom of the weighing bin is provided with a discharge outlet, and a discharge valve is provided on the discharge outlet.

[0009] The side wall of the feed cylinder is provided with a connecting interface for connecting to the powder conveying pipeline. The bottom of the feed cylinder is open and connected to the feed port through a flexible connection. The top of the feed cylinder is threadedly connected to a transmission rod. The bottom outer wall of the transmission rod is evenly provided with partitions. The bottom end of the transmission rod is rotatably connected to a blocking disc.

[0010] The blocking disc is slidably connected inside the feed cylinder, and a vertical guide mechanism is provided between the blocking disc and the feed cylinder. The blocking disc has a lower opening, and a distribution box is provided on the top surface of the blocking disc. The partition is matched with the size of the distribution box. The partition rotates in the distribution box and divides the distribution box into multiple cavities. The top surface of the distribution box has an upper opening.

[0011] The drive motor is located above the feed cylinder and is used to drive the transmission rod to rotate.

[0012] Preferably, the flexible connection is a connecting sleeve made of flexible material, and the two ends of the connecting sleeve are respectively connected to the feed cylinder and the feed inlet, effectively reducing the impact of feed cylinder vibration on symmetrical weight.

[0013] Preferably, the top of the mounting bracket is provided with a bearing seat, the bearing seat is provided with a driven gear, the driven gear is provided with a sliding sleeve, the output end of the drive motor is provided with a driving gear, the driving gear meshes with the driven gear, and the transmission rod passes through the center hole of the bearing seat and the driven gear and is slidably connected with the sliding sleeve to realize the stable rotation of the transmission rod.

[0014] Preferably, the top outer wall of the transmission rod is provided with a slide bar along the axial direction, and the central hole of the sliding sleeve is provided with a slide groove along the axial direction. The slide bar is adapted to the slide groove to ensure that the transmission rod can slide axially while rotating.

[0015] Preferably, the upper opening and the lower opening are matched and correspond to the dimensions of the cavity separated by the partition, and the upper opening and the lower opening are staggered to realize the batch quantitative conveying of powder.

[0016] Preferably, the vertical guiding mechanism includes a guide seat and a guide rod. The guide seats are symmetrically arranged on the inner wall of the feed cylinder, and the guide rods are symmetrically arranged on the top surface of the blockage disc. The guide rods are slidably connected in the guide seats to ensure the stability of the vertical movement of the blockage disc.

[0017] Preferably, the transmission rod has a threaded section in the middle and the top of the feed cylinder has an internal threaded seat. The threaded section is threadedly connected in the internal threaded seat, so that the transmission rod can drive the blocking disc to move up and down when it rotates.

[0018] Preferably, the inner top of the feed cylinder is provided with an isolation cover, which is slidably connected to the transmission rod, and the connection between the isolation cover and the transmission rod is located below the threaded section to prevent powder from entering the threaded connection and affecting the transmission.

[0019] Preferably, the edge of the blocking disc is provided with a chamfered structure, which is used for the blocking disc to connect with the feed cylinder, so as to facilitate the installation and sealing of the blocking disc.

[0020] In summary, the technical effects and advantages of this utility model are as follows:

[0021] 1. This utility model, through the combined design of the dispensing box and the partition, can convey powder through multiple independent cavities within the dispensing box. By controlling the speed and rotation angle of the transmission rod, the feed amount of each cavity can be precisely controlled, achieving precise replenishment of small doses.

[0022] 2. The use of a flexible connection in this utility model reduces the impact of feed cylinder vibration on the weighing sensor and avoids measurement errors caused by impact;

[0023] 3. The isolation cover in this utility model can prevent powder from entering the screw drive component and ensure the long-term stable operation of the equipment;

[0024] 4. This device is suitable for the precise metering of various powders such as cement, fly ash, and mineral powder, meeting the needs of different concrete production processes. It has a reasonable structural design, is easy to operate, and can be widely used in various concrete mixing plants. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the left-side structure of this utility model;

[0028] Figure 3 This utility model Figure 2 A schematic diagram of the AA cross-sectional structure;

[0029] Figure 4 This utility model Figure 3 A magnified structural diagram at point B;

[0030] Figure 5 This utility model Figure 3 A magnified structural diagram at point C;

[0031] Figure 6 This is a schematic diagram of the transmission rod structure of this utility model;

[0032] Figure 7 This is a schematic diagram of the material blocking disc structure of this utility model.

[0033] In the diagram: 1. Mounting bracket; 10. Load cell; 11. Weighing bin; 12. Discharge valve; 13. Connecting sleeve;

[0034] 2. Feed cylinder; 20. Connecting port; 21. Internal thread seat; 22. Isolation cover; 23. Guide seat;

[0035] 3. Drive motor; 30. Bearing housing; 31. Drive gear; 32. Driven gear; 33. Sliding sleeve;

[0036] 4. Drive rod; 40. Partition plate; 41. Threaded section; 42. Sliding bar;

[0037] 5. Blocking tray; 50. Distributor box; 51. Guide rod; 52. Upper opening; 53. Lower opening. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Example: Reference Figure 1-7 The present invention is a precise metering device for powder materials in a concrete mixing plant, including a mounting frame 1, on which a weighing bin 11, a feeding cylinder 2 and a drive motor 3 are installed sequentially from bottom to top.

[0040] A weighing sensor 10 is installed between the weighing bin 11 and the mounting frame 1. The top of the weighing bin 11 is provided with a feed inlet, and the bottom of the weighing bin 11 is provided with a discharge outlet. A discharge valve 12 is provided on the discharge outlet to control the discharge of powder.

[0041] The side wall of the feed cylinder 2 is provided with a docking interface 20, which is used to connect the powder conveying pipeline. The bottom of the feed cylinder 2 is open and connected to the feed port through the connecting sleeve 13.

[0042] The top of the feed cylinder 2 is threadedly connected to a transmission rod 4. The bottom outer wall of the transmission rod 4 is evenly provided with partitions 40. The bottom end of the transmission rod 4 is rotatably connected to a blocking disc 5, which is slidably connected inside the feed cylinder 2.

[0043] The blocking plate 5 is slidably connected inside the feed cylinder 2, and a vertical guide mechanism is provided between the blocking plate 5 and the feed cylinder 2. The blocking plate 5 has a lower opening 53, and a distribution box 50 is provided on the top surface of the blocking plate 5. The size of the partition plate 40 matches that of the distribution box 50. The partition plate 40 rotates in the distribution box 50 and divides the distribution box 50 into multiple cavities. The top surface of the distribution box 50 has an upper opening 52.

[0044] The drive motor 3 is located above the feed cylinder 2, and the drive motor 3 is used to drive the transmission rod 4 to rotate.

[0045] As one implementation method in this embodiment, to reduce the impact of vibration of the feed cylinder 2 on the balancing, such as Figure 1 , Figure 2 , Figure 5 As shown, the flexible connection method is the connecting sleeve 13, which is made of flexible material, and the two ends of the connecting sleeve 13 are respectively connected to the feed cylinder 2 and the feed port.

[0046] As one implementation method in this embodiment, to achieve the rotation and axial sliding of the transmission rod 4, such as... Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, the top of the mounting bracket 1 is provided with a bearing seat 30, the bearing seat 30 is provided with a driven gear 32, the driven gear 32 is provided with a sliding sleeve 33, the output end of the drive motor 3 is provided with a driving gear 31, the driving gear 31 meshes with the driven gear 32, and the transmission rod 4 passes through the center hole of the bearing seat 30 and the driven gear 32 and is slidably connected with the sliding sleeve 33.

[0047] As one implementation method in this embodiment, to achieve stable vertical sliding of the transmission rod 4, such as... Figure 6 As shown, the top outer wall of the transmission rod 4 is provided with a slide bar 42 along the axial direction, and the center hole of the sliding sleeve 33 is provided with a slide groove along the axial direction, and the slide bar 42 is adapted to the slide groove.

[0048] As one implementation method in this embodiment, in order to achieve the purpose of batch quantitative conveying of powder during weighing, such as Figure 5 , Figure 7 The upper opening 52 and the lower opening 53 are matched with the dimensions and positions of the cavities separated by the partition 40, and the upper opening 52 and the lower opening 53 are staggered.

[0049] As one implementation method in this embodiment, to prevent the blocking disc 5 from rotating when it is vertical, such as Figure 5 , Figure 7 As shown, the vertical guiding mechanism includes a guide seat 23 and a guide rod 51. The guide seat 23 is symmetrically arranged on the inner wall of the feed cylinder 2, and the guide rod 51 is symmetrically arranged on the top surface of the blockage plate 5. The guide rod 51 is slidably connected in the guide seat 23.

[0050] As one implementation method in this embodiment, to achieve various displacement effects such as rotation and lifting of the transmission rod 4, such as Figure 1 , Figure 2 As shown, the transmission rod 4 has a threaded section 41 in the middle and the feed cylinder 2 has an internal threaded seat 21 at the top. The threaded section 41 is threadedly connected to the internal threaded seat 21.

[0051] As one implementation method in this embodiment, to prevent powder from entering the threaded connection portion, such as... Figure 3 As shown, the inner top of the feed cylinder 2 is provided with an isolation cover 22, which is slidably connected to the transmission rod 4, and the connection between the isolation cover 22 and the transmission rod 4 is located below the threaded section 41.

[0052] As one implementation method in this embodiment, to facilitate the docking and sealing of the material blocking disc 5 with the feed cylinder 2, such as Figure 5 , Figure 7 As shown, the edge of the blocking disc 5 is provided with a chamfered structure, which is used for the blocking disc 5 to connect with the feed cylinder 2.

[0053] The working principle of this device is as follows: When the device is in standby mode, the blocking plate 5 is located at the bottom of the feeding cylinder 2, blocking the bottom of the feeding cylinder 2. The discharge valve 12 is closed, the weighing sensor 10 is initialized and zeroed, and the drive motor 3, transmission rod 4, distribution box 50 and partition plate 40 are all stationary. When metering, the drive motor 3 on the mounting frame 1 starts and rotates forward. Through the meshing of the drive gear 31 and the driven gear 32 on the bearing seat 30, the transmission rod 4 is driven to rotate. Since the threaded section 41 in the middle of the transmission rod 4 is threadedly engaged with the internal threaded seat 21 at the top of the feeding cylinder 2, and the slide bar 42 is slidably engaged with the sliding sleeve 33, the transmission rod 4 moves downward while rotating.

[0054] The transmission rod 4 drives the blocking disc 5 to move downwards synchronously, causing the blocking disc 5 to disengage from the bottom of the feed cylinder 2, thus forming a channel between the feed cylinder 2 and the weighing chamber 11. Powder enters the feed cylinder 2 through the interface 20 and falls into the weighing chamber 11 through the channel between the feed cylinder 2 and the weighing chamber 11. At this time, the drive motor 3 stops, and the powder continues to fall into the weighing chamber 11. The weighing sensor 10 monitors the weight of the powder in the weighing chamber 11 in real time. When the weight approaches a preset value, the drive motor 3 starts and rotates in reverse, driving the blocking disc 5 upwards synchronously via the transmission rod 4. The bottom of the feed cylinder 2 is closed. Due to the cooperation between the guide rod 51 and the guide seat 23, the blocking plate 5 does not rotate. At this time, the powder enters the cavity of the distribution box 50 from the upper opening 52 due to gravity. With the rotation of the partition plate 40, a small amount of powder in each cavity is swept to the lower opening 53 and falls into the weighing bin 11, realizing small-dose precise feeding. When the weighing sensor 10 detects that the weight has reached the preset value, the drive motor 3 immediately stops rotating, the blocking plate 5 stops moving upward, the partition plate 40 stops rotating, and the metering feeding process ends.

[0055] When it is necessary to discharge the powder in the weighing chamber 11, the control system opens the discharge valve 12, and the powder enters the subsequent mixing process through the discharge port. During the discharge process, the weighing sensor 10 continuously monitors the weight change to ensure complete discharge.

[0056] The isolation cover 22 effectively prevents powder from entering the mating part between the threaded section 41 and the internal thread seat 21, ensuring the stable operation of the transmission system. The connecting sleeve 13 can reduce the impact of vibration of the feed cylinder 2 on the symmetrical weighing chamber 11 and improve the metering accuracy.

[0057] The electromechanical connections involved in this utility model are common practices used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments; they are common knowledge.

[0058] Components not described in detail in this article are existing technologies.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A precise metering device for powder materials in a concrete mixing plant, characterized in that, include: Mounting frame (1), on which weighing bin (11), feeding cylinder (2) and drive motor (3) are installed sequentially from bottom to top; A weighing sensor (10) is installed between the weighing bin (11) and the mounting frame (1). The top of the weighing bin (11) is provided with a feed inlet, the bottom of the weighing bin (11) is provided with a discharge outlet, and a discharge valve (12) is provided on the discharge outlet. The feed cylinder (2) has a connecting interface (20) on its side wall. The connecting interface (20) is used to connect to the powder conveying pipe. The bottom of the feed cylinder (2) is open and connected to the feed port through a flexible connection. The top of the feed cylinder (2) is threaded with a transmission rod (4). The bottom outer wall of the transmission rod (4) is evenly provided with partitions (40). The bottom end of the transmission rod (4) is rotatably connected to a blocking disc (5). The blocking disc (5) is slidably connected inside the feed cylinder (2), and a vertical guide mechanism is provided between the blocking disc (5) and the feed cylinder (2). The blocking disc (5) has a lower opening (53), and a distribution box (50) is provided on the top surface of the blocking disc (5). The partition (40) matches the size of the distribution box (50). The partition (40) rotates in the distribution box (50) and the partition (40) divides the distribution box (50) into multiple cavities. The top surface of the distribution box (50) has an upper opening (52). The drive motor (3) is located above the feed cylinder (2) and is used to drive the transmission rod (4) to rotate.

2. The precise metering device for powder materials in a concrete mixing plant according to claim 1, characterized in that: The flexible connection is a connecting sleeve (13), which is made of flexible material, and the two ends of the connecting sleeve (13) are respectively connected to the feed cylinder (2) and the feed port.

3. The precise metering device for powder materials in a concrete mixing plant according to claim 1, characterized in that: The top of the mounting bracket (1) is provided with a bearing seat (30), the bearing seat (30) is provided with a driven gear (32), the driven gear (32) is provided with a sliding sleeve (33), the output end of the drive motor (3) is provided with a driving gear (31), the driving gear (31) meshes with the driven gear (32), and the transmission rod (4) passes through the center hole of the bearing seat (30) and the driven gear (32) and is slidably connected with the sliding sleeve (33).

4. The precise metering device for powder materials in a concrete mixing plant according to claim 3, characterized in that: The top outer wall of the transmission rod (4) is provided with a slide bar (42) along the axial direction, and the central hole of the sliding sleeve (33) is provided with a sliding groove along the axial direction, and the slide bar (42) is adapted to the sliding groove.

5. The precise metering device for powder materials in a concrete mixing plant according to claim 1, characterized in that: The upper opening (52) and the lower opening (53) are matched and correspond to the dimensions of the cavity separated by the partition (40), and the upper opening (52) and the lower opening (53) are offset.

6. The precise metering device for powder materials in a concrete mixing plant according to claim 1, characterized in that: The vertical guiding mechanism includes a guide seat (23) and a guide rod (51). The guide seat (23) is symmetrically arranged on the inner wall of the feed cylinder (2), and the guide rod (51) is symmetrically arranged on the top surface of the blocking plate (5). The guide rod (51) is slidably connected in the guide seat (23).

7. The precise metering device for powder materials in a concrete mixing plant according to claim 1, characterized in that: The transmission rod (4) has a threaded section (41) in the middle, and the feed cylinder (2) has an internal thread seat (21) at the top. The threaded section (41) is threaded in the internal thread seat (21).

8. The precise metering device for powder materials in a concrete mixing plant according to claim 7, characterized in that: The inner top of the feed cylinder (2) is provided with an isolation cover (22), which is slidably connected to the transmission rod (4), and the connection between the isolation cover (22) and the transmission rod (4) is located below the threaded section (41).

9. The precise metering device for powder materials in a concrete mixing plant according to claim 1, characterized in that: The edge of the blocking disc (5) is provided with a chamfered structure, which is used for the blocking disc (5) to connect with the feed cylinder (2).

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