High-end weightlessness type feeding machine

Abstract

The utility model discloses a high-end weightlessness type feeding machine which comprises a hopper, a ball hopper arranged below the hopper, a discharging pipe arranged below the ball hopper, a discharging opening communicated with a discharging opening is formed in the discharging pipe, a weighing assembly is arranged below the discharging pipe, a sealing device is arranged at the connecting position of a stirring shaft and the ball hopper, and the sealing structure comprises a sealing pipe. The sealing bearing is embedded in the sealing pipe, and the PTFE sealing sleeve and the oil seal are arranged, so that the problem that a single oil seal structure is easy to cause material leakage and external pollution is solved; a connecting structure of the discharging pipe and the ball hopper is improved, and an anti-falling bolt and a quick-mounting chuck are additionally arranged, so that the discharging pipe with high failure rate is easy to overhaul and maintain; the discharge port and the blanking port are arranged to be of a reducing pipe structure, and flexible connection is additionally arranged, so that the production problem of material accumulation is solved; and the feeding motor is additionally arranged, so that the PLC independently controls the feeding speed of the feeding shaft, and the problem of non-uniform stirring speed caused by a single motor is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of feeding machines, in particular to a loss-in-weight feeder. Background Art

[0002] A loss-in-weight feeder is a material feeding device that measures the actual weight loss rate of the material and compares it with the preset weight loss rate. The feeding rate of the feeder is automatically corrected by adjusting the feeder rate through a PLC controller, so as to continuously feed the material evenly and accurately. However, the common sealing method at the ball hopper stirring part of the current loss-in-weight feeder is a single oil seal, which is prone to material leakage; the discharge assembly and the ball hopper are connected by bolts, and the bolts are easily lost during disassembly, repair and maintenance, which is inconvenient for repair and maintenance.

[0003] The patent application for invention with publication number CN110450382A discloses a twin-screw feeder, the technical key points of which are that the driving gear of each screw on the twin-screw is meshed with the driving gear of the driving motor, and the main shaft of the driving motor drives the stirring shaft connected by the steering driving device through a belt to complete the stirring action, avoiding the situation of material bridging in the ball hopper. However, the stirring shaft and the screw shaft share a reducer and a motor, which is prone to the problem of uneven material stirring speed.

[0004] The utility model patent with publication number CN220033396U discloses a single-screw feeding mechanism, in which the discharge port and the feeding port are connected by a flexible connection, but the same diameters of the discharge port and the feeding port are prone to material accumulation. Content of the Utility Model

[0005] The first object of the utility model is to provide a new sealing structure to solve the problem of easy material leakage of the single oil seal and reduce the replacement frequency of the sealing parts; the second object is to solve the problem that the flexible connection between the discharge port and the feeding port is prone to material accumulation, which in turn affects the weighing accuracy; the third object is to improve the structure of the discharge pipe to make it convenient for inspection and maintenance; the fourth object is to solve the problem that the stirring shaft and the screw share a reducer and a motor, resulting in uneven stirring and feeding speeds.

[0006] To achieve the above first object, the technical solution provided by the utility model is:

[0007] A high-end loss-in-weight feeder, comprising a hopper, a feed inlet arranged above the hopper and communicated with the hopper, a spherical hopper arranged below the hopper, and a discharge pipe arranged below the spherical hopper; a stirring shaft connected to a stirring motor is arranged in the hopper, a discharge shaft is arranged inside the discharge pipe, a discharge port is arranged at the end of the discharge pipe, a blanking port is communicated below the discharge port, a weighing assembly is arranged below the discharge pipe, and the weighing assembly and the stirring motor are electrically connected to a PLC controller, characterized in that: a sealing device is arranged between the spherical hopper and the stirring shaft, and the sealing device comprises a sealing pipe which is arranged at the connection between the stirring motor and the spherical hopper and partially embedded in the spherical hopper.

[0008] A further embodiment further includes that the sealing pipe is formed by die pressing and internally embedded with a sealing bearing, and the stirring shaft passes through the inner ring of the sealing bearing and is tightly fitted with the inner ring of the sealing bearing.

[0009] A further embodiment further includes that PTFE sealing sleeves are arranged on both sides of the sealing bearing, the inner diameter of the PTFE sealing sleeve is adapted to the outer diameter of the stirring shaft, and the outer diameter of the PTFE sealing sleeve is adapted to the inner diameter of the sealing pipe.

[0010] A further embodiment further includes that an oil seal is arranged on the outer side of the PTFE sealing sleeve.

[0011] To achieve the above second object, the technical solution provided by the present utility model includes: the diameter of the blanking port is larger than the diameter of the discharge port, forming a reduced-diameter pipe connection structure.

[0012] A further embodiment further includes: a flexible connection is adopted between the discharge port and the blanking port.

[0013] To achieve the above third object, the technical solution provided by the present utility model includes: an anti-loosening bolt connection is adopted between the discharge pipe and the spherical hopper.

[0014] A further embodiment further includes: a quick-release chuck is further arranged between the discharge pipe and the discharge port.

[0015] To achieve the above fourth object, the technical solution provided by the present utility model includes: a feeding motor is further arranged, the discharge shaft is connected to the main shaft of the feeding motor, and the feeding motor is electrically connected to the PLC controller through a circuit.

[0016] The advantages and beneficial effects of the present utility model are as follows:

[0017] 1. A sealing device is arranged between the spherical hopper and the stirring motor, including a sealing pipe, a sealing bearing, PTFE sealing sleeves and an oil seal, which improves the sealing effect in the radial and axial directions, prevents material leakage and external contamination problems, and has little influence on the rotation of the stirring shaft at the same time.

[0018] 2. Set the diameter of the blanking port to be larger than that of the discharge port to form a reducing pipe structure, and a flexible connection is provided between the blanking port and the discharge port, reducing the problem of material accumulation between the discharge port and the blanking port.

[0019] 3. By providing anti-loosening bolts between the discharge pipe and the ball hopper, it is not necessary to completely unscrew the bolts during maintenance, avoiding the problem of loss of fasteners during the maintenance process. In addition, a quick-release chuck is provided, making maintenance and repair more convenient.

[0020] 4. The mixing motor and the feeding motor are separately arranged and connected to the PLC controller, enabling them to work independently of each other, and solving the problem of uneven mixing speed caused by sharing a reducer and a motor between the two. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0022] Figure 2 is a schematic internal structure diagram of the sealing device of an embodiment of the present utility model;

[0023] Reference Numerals:

[0024] 10 - Hopper, 11 - Feeding Port, 20 - Ball Hopper, 21 - Sealing Device, 22 - Sealing Pipe, 23 - Sealing Bearing, 24 - PTFE Sealing Sleeve, 25 - Oil Seal, 30 - Discharge Pipe, 31 - Discharge Port, 32 - Mixing Motor, 33 - Mixing Shaft, 34 - Anti-loosening Bolt, 35 - Quick-release Chuck, 40 - Flexible Connection, 41 - Blanking Port, 50 - Weighing Assembly, 60 - Feeding Motor, 70 - PLC Controller. Detailed Embodiment

[0025] The following combines the drawings and embodiments to further describe the specific embodiments of the present utility model. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model.

[0026] Embodiment

[0027] Please refer to Figures 1 to 2 , a high-end loss-in-weight feeder, including a hopper 10, a feeding port 11 provided above the hopper 10 and communicating with the hopper 10, a ball hopper 20 provided below the hopper 10, and a discharge pipe 30 provided below the ball hopper 20; a mixing shaft 33 connected to a mixing motor 32 is provided inside the hopper 10, a discharge shaft is provided inside the discharge pipe 30, a discharge port 31 is provided at the end of the discharge pipe 30, the discharge port 31 communicates with a blanking port 41 below, a weighing assembly 50 is provided below the discharge pipe 30, and the weighing assembly 50 and the mixing motor 32 are electrically connected to a PLC controller 70.

[0028] A sealing device 21 is provided between the spherical hopper 20 and the stirring shaft 33. The sealing device 21 includes a sealing tube 22 formed by molding. The sealing tube 22 is arranged at the connection of the stirring motor 32 and the spherical hopper 20 and partially embedded in the spherical hopper 20. A sealing bearing 23 is embedded inside the sealing tube 22. The stirring shaft 33 passes through the inner ring of the sealing bearing 23 and is closely attached to the inner ring of the sealing bearing 23. PTFE sealing sleeves 24 are also arranged on both sides of the sealing bearing 23. The inner diameter of the PTFE sealing sleeve 24 is adapted to the outer diameter of the stirring shaft 33, and the outer diameter of the PTFE sealing sleeve 24 is adapted to the inner diameter of the sealing tube. An oil seal 25 is also arranged on the outer side of the PTFE sealing sleeve 24. The length of the sealing tube 22 and the structure of being embedded in the spherical hopper 20 extend the length of the axial seal. The sealing bearing is embedded in the sealing tube 22 formed by molding, reducing the large friction force generated between the sealing tube 22 and the stirring shaft 33 due to the length. At the same time, the sealing bearing 23 provides a second seal axially. The PTFE sealing sleeves 24 and the oil seal 25 further isolate the external dust pollution and prevent the leakage of the materials in the spherical hopper 20. The structure is simple and the effect is excellent.

[0029] The diameter of the material discharge opening 41 is larger than that of the discharge port 31, forming a reduced-diameter pipe connection structure. A flexible connection 40 is also arranged between the material discharge opening 41 and the discharge port 31. The flexible connection adopted in this embodiment is a flexible flange. The reduced-diameter pipe structure is from small to large, providing sufficient movement space for the physical flow and effectively alleviating the problem of material accumulation.

[0030] The discharge pipe 30 and the spherical hopper 20 are connected by anti-loosening bolts 34. A quick-release chuck 35 is also arranged between the discharge pipe 30 and the discharge port 31. It can be understood that in the discharge pipe 30, the feeding shaft may be stuck due to too large a flow rate of solid materials, or the discharge shaft may be displaced due to the impact of the materials. This is a position where the feeder is prone to failure. The use of anti-loosening bolts 34 avoids the loss of fasteners during maintenance and repair, which affects production. The quick-release chuck 35 is installed to make the discharge pipe 30 easy to disassemble and replace the discharge shaft.

[0031] A feeding motor 60 is additionally provided. The discharge shaft is connected to the main shaft of the feeding motor 60. The feeding motor 60 is electrically connected to the PLC controller. An independent motor is adopted to separately control the feeding speed through the PLC controller 70, avoiding the problem of uneven feeding speed caused by a single motor.

[0032] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A high-end loss-in-weight feeder, comprising a hopper, a feed inlet arranged above the hopper and communicating with the hopper, a ball hopper arranged below the hopper, and a discharge pipe arranged below the ball hopper; a stirring shaft connected to a stirring motor is arranged in the hopper, a discharge shaft is arranged inside the discharge pipe, a discharge port is arranged at the end of the discharge pipe, a feeding port is communicated below the discharge port, a weighing assembly is arranged below the discharge pipe, and the weighing assembly and the stirring motor are electrically connected to a PLC controller, characterized in that: A sealing device is provided between the ball hopper and the stirring shaft. The sealing device includes a sealing pipe which is arranged at the connection of the stirring shaft and the ball hopper and partially embedded in the ball hopper.

2. The high-end loss-in-weight feeder according to claim 1, wherein: The sealing pipe is formed by molding and internally inlaid with a sealing bearing. The stirring shaft passes through the inner ring of the sealing bearing and fits tightly with the inner ring.

3. The high-end loss-in-weight feeder according to claim 2, wherein: PTFE sealing sleeves are also arranged on both sides of the sealing bearing. The inner diameter of the PTFE sealing sleeve fits the outer diameter of the stirring shaft, and the outer diameter of the PTFE sealing sleeve fits the inner diameter of the sealing pipe.

4. The high-end loss-in-weight feeder according to claim 3, wherein: An oil seal is also arranged on the outer side of the PTFE sealing sleeve.

5. The high-end loss-in-weight feeder according to claim 1, characterized in that: The diameter of the blanking port is larger than that of the discharge port.

6. The high-end loss-in-weight feeder according to claim 5, wherein: A flexible connection is adopted between the discharge port and the blanking port.

7. The high-end loss-in-weight feeder according to claim 1, wherein: A quick-release chuck is also arranged between the discharge pipe and the discharge port.

8. The loss-in-weight feeder according to claim 1, wherein: A feeding motor is also provided. The discharge shaft is connected to the main shaft of the feeding motor, and the feeding motor is electrically connected to the PLC controller.

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