High-precision micro-metering double-screw powder subtraction scale

Abstract

The utility model discloses a high-precision micro-metering double-screw powder subtraction scale, which comprises a stock bin, a scattering device, a first screw, a second screw, a power mechanism, a weighing sensor and a base, the stock bin, the weighing sensor and the power mechanism are all arranged on the base, and the weighing sensor is located below the stock bin; the scattering device is arranged at the bottom of an inner cavity of the stock bin and comprises a scattering rotating shaft, a connecting rod and scattering blades, the connecting rod is fixed to the end of the scattering rotating shaft, and the two scattering blades are fixed to the two ends of the connecting rod respectively; a conveying pipe is arranged at a discharging port of the stock bin, and the first screw and the second screw are both arranged in the conveying pipe. And the power mechanism is used for driving the scattering rotating shaft, the first screw rod and the second screw rod to rotate. The utility model provides a high-precision micro-metering double-screw powder subtraction scale, which can effectively prevent the phenomenon of arching and bridging of powder and improve the feeding precision at the same time.

Description

Technical Field

[0001] The utility model relates to a high-precision micro metering double-screw powder subtraction scale. Background Art

[0002] At present, during the production of mortar used in the construction industry, various sand materials and powder materials need to be metered by a metering scale and then enter the next-level production equipment for use. However, during the use of the existing powder metering scale, there is a problem of insufficient metering accuracy. After the powder accumulates in the granary of the metering scale, the phenomenon of arching and bridging occurs, resulting in difficult feeding and inconvenience to subsequent production. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a high-precision micro metering double-screw powder subtraction scale, which can effectively prevent the phenomenon of arching and bridging of the powder and improve the feeding accuracy at the same time.

[0004] In order to solve the above technical problem, the technical solution of the utility model is as follows:

[0005] A high-precision micro metering double-screw powder subtraction scale, which comprises a feed bin, a dispersing device, a first screw, a second screw, a power mechanism, a weighing sensor and a base;

[0006] The feed bin, the weighing sensor and the power mechanism are all arranged on the base, and the weighing sensor is located below the feed bin;

[0007] The dispersing device is arranged at the bottom of the inner cavity of the feed bin. The dispersing device comprises a dispersing rotating shaft, a connecting rod and dispersing blades. The connecting rod is fixed at the end of the dispersing rotating shaft, and the two dispersing blades are respectively fixed at both ends of the connecting rod;

[0008] A conveying pipe is arranged at the discharge port of the feed bin, and the first screw and the second screw are both arranged in the conveying pipe;

[0009] The power mechanism is used to drive the dispersing rotating shaft, the first screw and the second screw to rotate.

[0010] Further, the dispersing blades are arc-shaped.

[0011] Further, the power mechanism includes a variable-frequency motor, a speed reducer, and a transmission box body. A first driving sprocket, a second driving sprocket, a third driving sprocket, a dispersing sprocket, a first screw sprocket, and a second screw sprocket are arranged in the transmission box body. The variable-frequency motor is connected to the speed reducer. The first driving sprocket, the second driving sprocket, and the third driving sprocket are all fixed on the output shaft of the speed reducer. The dispersing sprocket is fixed on the dispersing rotating shaft. The first screw sprocket is fixed on the first screw. The second screw sprocket is fixed on the second screw. The first driving sprocket is in transmission connection with the dispersing sprocket through a chain. The second driving sprocket is in transmission connection with the first screw sprocket through a chain. The third driving sprocket is in transmission connection with the second screw sprocket through a chain.

[0012] Further, an electrical control box is arranged on the base.

[0013] Further, shock pads are arranged at the bottom of the base.

[0014] Further, a feeding flexible connection is arranged at the feeding port of the bin.

[0015] Further, a breather cap is arranged at the top of the bin.

[0016] Further, a discharging flexible connection is arranged at the discharging port of the conveying pipe.

[0017] By adopting the above technical solution, in the utility model, the dispersing rotating shaft performs spherical dispersing rotation at the bottom of the inner cavity of the bin, stirs in the horizontal and vertical directions, and performs all-round dispersion on the powder in the bin, which can effectively solve the problem of material arching and bridging. The double screws are used for extrusion and discharging, which can improve the feeding accuracy while ensuring linear feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a high-precision micro-metering double-screw powder subtraction scale of the utility model;

[0019] Figure 2 is Figure 1 the left view of;

[0020] Figure 3 is Figure 1 the top view of;

[0021] Figure 4 is a schematic structural diagram of the transmission connection in the transmission box body of the utility model;

[0022] Figure 5 is a schematic structural diagram of the first screw and the second screw of the utility model;

[0023] Figure 6Schematic installation structure diagram of the first driving sprocket, the second driving sprocket and the third driving sprocket of the present utility model. Detailed implementation mode

[0024] In order to make the content of the present utility model easier to be clearly understood, the following further detailed description of the present utility model is given according to specific embodiments in conjunction with the accompanying drawings.

[0025] As Figure 1 、 2 、Fig. 3 show, the present embodiment provides a high-precision micro metering twin-screw powder subtraction weigher, which includes a silo 1, a dispersing device, a first screw 21, a second screw 22, a power mechanism, a weighing sensor 3 and a base 4.

[0026] As Figure 1 、 2 、Fig. 3 show, the silo 1, the weighing sensor 3 and the power mechanism of the present embodiment are all arranged on the base 4, and the weighing sensor 3 is located below the silo 1 for weighing the silo 1.

[0027] As Figure 1 、 2 、Fig. 3 show, the dispersing device of the present embodiment is arranged at the bottom of the inner cavity of the silo 1. The dispersing device includes a dispersing rotating shaft 51, a connecting rod 52 and dispersing blades 53. The connecting rod 52 is fixed at the end of the dispersing rotating shaft 51, and two dispersing blades 53 are respectively fixed at both ends of the connecting rod 52. The dispersing blades 53 are arc-shaped. After the dispersing rotating shaft 51 rotates, the two arc-shaped dispersing blades 53 can be driven to rotate at the bottom of the inner cavity of the silo 1. Since the two dispersing blades 53 are arc-shaped, during the dispersing process, the rotation coverage area of the two dispersing blades 53 is a sphere, so that the powder in the silo 1 can be dispersed in all directions to prevent the powder from arching and bridging.

[0028] As Figure 1 、 2 、Fig. 3 show, a conveying pipe 6 is arranged at the discharge port of the silo 1 of the present embodiment. Both ends of the first screw 21 and the second screw 22 are fixed in the conveying pipe 6 through bearing seats, and a discharge flexible connection 12 is arranged at the discharge port of the conveying pipe 6. After the powder in the silo 1 enters the conveying pipe 6, it is simultaneously spirally conveyed by the first screw 21 and the second screw 22. The present embodiment adopts a twin-screw structure, and the powder material is extruded between the two screws and then output from the discharge port of the conveying pipe 6. While ensuring linear feeding, a feeding accuracy of ±0.2% can be achieved. A discharge flexible connection 12 is arranged at the discharge port of the conveying pipe 6, and the conveying pipe 6 is connected to the next-level equipment through the discharge flexible connection 12. The flexible connection generally adopts a structure connected by a cloth bag or a filter cloth, which can avoid the measurement error of the weighing scale caused by equipment vibration.

[0029] As Figure 1 、 2, as shown in FIGS. 3, the power mechanism of this embodiment is used to drive the dispersion rotating shaft 51, the first screw 21 and the second screw 22 to rotate. The power mechanism of this embodiment includes a variable-frequency motor 71, a speed reducer 72 and a transmission housing 73. A first driving sprocket 74, a second driving sprocket 75, a third driving sprocket 76, a dispersion sprocket 77, a first screw sprocket 78 and a second screw sprocket 79 are arranged in the transmission housing 73. The variable-frequency motor 71 is connected to the speed reducer 72. The first driving sprocket 74, the second driving sprocket 75 and the third driving sprocket 76 are all fixed on the output shaft 721 of the speed reducer 72. The dispersion sprocket 77 is fixed on the dispersion rotating shaft 51. The dispersion rotating shaft 51 is rotationally connected to the transmission housing 73 through a bearing seat. The first screw sprocket 78 is fixed on the first screw 21. The second screw sprocket 79 is fixed on the second screw 22. The first driving sprocket 74 is drivingly connected to the dispersion sprocket 77 through a chain. The second driving sprocket 75 is drivingly connected to the first screw sprocket 78 through a chain. The third driving sprocket 76 is drivingly connected to the second screw sprocket 79 through a chain. The speed reducer 72 drives the first driving sprocket 74, the second driving sprocket 75 and the third driving sprocket 76 to rotate coaxially. The first driving sprocket 74, the second driving sprocket 75 and the third driving sprocket 76 then drive the dispersion sprocket 77, the first screw sprocket 78 and the second screw sprocket 79 to rotate simultaneously, so as to drive the dispersion device, the first screw 21 and the second screw 22 to rotate. Since the rotation speed of the dispersion device needs to be slower than that of the first screw 21 and the second screw 22, the diameter of the dispersion sprocket 77 is larger than the diameters of the first screw sprocket 78 and the second screw sprocket 79. The diameters of the first screw sprocket 78 and the second screw sprocket 79 are the same.

[0030] As Figure 1 , 2 , as shown in FIGS. 3, an electrical control box 8 is arranged on the base 4 of this embodiment. Devices such as a PLC controller and a power supply are installed in the electrical control box 8 to collect the weighing values of the weighing sensors 3 and control the start-stop and rotation of the variable-frequency motor 71.

[0031] As Figure 1 , 2 , as shown in FIGS. 3, shock pads 9 are arranged at the bottom of the base 4 of this embodiment to relieve the vibration of the equipment on the ground during use.

[0032] As Figure 1 , 2 , as shown in FIGS. 3, a feeding flexible connection 10 is arranged at the feeding port of the feed bin 1 of this embodiment. The feed bin 1 is connected to the upper-level equipment through a flexible connection, which can avoid the measurement error of the weighing scale caused by the vibration of the equipment. A breather cap 11 is arranged at the top of the feed bin 1 of this embodiment to ventilate the feed bin 1 during feeding.

[0033] In the specific embodiments described above, the technical problems solved, the technical solutions and the beneficial effects of the present utility model have been further described in detail. It should be understood that the above description is only the specific embodiments of the present utility model and is not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A high-precision micro-metering twin-screw powder subtraction scale, characterized by: It comprises a material bin (1), a breaking device, a first screw (21), a second screw (22), a power mechanism, a weighing sensor (3) and a base (4); The silo (1), the weighing sensor (3) and the power mechanism are all arranged on a base (4), and the weighing sensor (3) is located below the silo (1); The scattering device is arranged at the bottom of the inner cavity of the silo (1), and comprises a scattering rotating shaft (51), a connecting rod (52) and scattering blades (53), wherein the connecting rod (52) is fixed to the end of the scattering rotating shaft (51), and the two scattering blades (53) are respectively fixed to the two ends of the connecting rod (52); The discharge port of the silo (1) is provided with a conveying pipe (6), and the first screw (21) and the second screw (22) are both arranged in the conveying pipe (6); The power mechanism is used to drive the breaking up rotating shaft (51), the first screw (21) and the second screw (22) to rotate.

2. The high-precision micro-metering twin-screw powder subtraction scale according to claim 1 is characterized in that: The scattering blades (53) are arc-shaped.

3. The high-precision micro-metering twin-screw powder subtraction scale according to claim 1 is characterized in that: The power mechanism comprises a variable frequency motor (71), a speed reducer (72) and a transmission housing (73); a first driving sprocket (74), a second driving sprocket (75), a third driving sprocket (76), a breaking sprocket (77), a first screw sprocket (78) and a second screw sprocket (79) are arranged in the transmission housing (73); the variable frequency motor (71) is connected to the speed reducer (72); the first driving sprocket (74), the second driving sprocket (75) and the third driving sprocket (76) are all fixed to the speed reducer (72); The first sprocket (74) is connected to the output shaft (721) of the dispersing device, the dispersing sprocket (77) is fixed on the dispersing rotating shaft (51), the first screw sprocket (78) is fixed on the first screw (21), the second screw sprocket (79) is fixed on the second screw (22), the first driving sprocket (74) is connected to the dispersing sprocket (77) through a chain, the second driving sprocket (75) is connected to the first screw sprocket (78) through a chain, and the third driving sprocket (76) is connected to the second screw sprocket (79) through a chain.

4. The high-precision micro-metering twin-screw powder subtraction scale according to claim 1 is characterized in that: An electrical control box (8) is arranged on the base (4).

5. The high-precision micro-metering twin-screw powder subtraction scale according to claim 1 is characterized in that: A shock-absorbing pad (9) is provided at the bottom of the base (4).

6. The high-precision micro-metering twin-screw powder subtraction scale according to claim 1 is characterized in that: The feed inlet of the silo (1) is provided with a feed soft connection (10).

7. The high-precision micro-metering twin-screw powder subtraction scale according to claim 1 is characterized in that: A vent cap (11) is provided on the top of the silo (1).

8. The high-precision micro-metering twin-screw powder subtraction scale according to claim 1, characterized in that: The discharge port of the conveying pipe (6) is provided with a discharge flexible connection (12).

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