Self-positioning sealing structure of weightlessness type feeding machine

Abstract

The utility model discloses a self-positioning sealing structure of a weightlessness type feeding machine, which comprises a ball hopper and a transmission shaft inserted into the ball hopper, a mounting seat is fixedly arranged at the position, inserted into the transmission shaft, of the outer side of the ball hopper, a cover plate is arranged outside the mounting seat, and the transmission shaft penetrates through a rotating hole of the cover plate. A PTFE sealing sleeve is arranged on the periphery of the transmission shaft in the cover plate, the outer diameter of the PTFE sealing sleeve is matched with the inner diameter of the rotating hole, the inner diameter of the PTFE sealing sleeve is further matched with the outer diameter of the transmission shaft, oil seals are further arranged in the transmission shaft and the rotating hole, a round hole is formed in the surface of the cover plate, and a threaded hole is formed in the surface of the mounting base. Screws are used for sequentially penetrating through the elastic washer, the flat washer, the cover plate and the silica gel pad to be connected to the mounting base, so that the cover plate is not mechanically positioned and has a certain degree of freedom. By means of the structure, a better sealing effect is achieved between the ball hopper and the transmission shaft of the weightlessness type feeding machine, and the problems of material leakage and pollution are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of feeders, in particular to a loss-in-weight feeder, and more specifically to a sealing structure of a loss-in-weight feeder. Background Art

[0002] A loss-in-weight feeder consists of a hopper, a ball bucket, a feeder, a weighing system, and a regulator. It is a device that accurately measures and controls the discharge flow rate. The ball bucket of a loss-in-weight feeder is connected to a drive shaft to transport the material.

[0003] Currently, a single oil seal is commonly used to seal the drive shaft and ball bucket. Due to manufacturing errors in the ball bucket and assembly errors between the drive shaft and ball bucket, the concentricity between the drive shaft and ball bucket is poor. This can cause the oil seal to deform or fail during prolonged operation, allowing the material in the ball bucket to leak out through the deformed or failed seal or become contaminated. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a self-positioning sealing structure for a loss-in-weight feeder, so as to solve the problem that the material in the ball bucket leaks outward from between the drive shaft and the ball bucket and is contaminated during movement.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the utility model is: a self-positioning sealing structure of a loss-in-weight feeder, comprising a ball bucket and a transmission shaft inserted into the ball bucket, a mounting seat fixedly provided at the position where the transmission shaft is inserted outside the ball bucket, a cover plate provided outside the mounting seat, the transmission shaft passes through a rotating hole penetrating the cover plate, a PTFE sealing sleeve is provided on the periphery of the transmission shaft inside the cover plate, the outer diameter of the PTFE sealing sleeve is adapted to the inner diameter of the rotating hole, and the material is radially sealed.

[0006] A further embodiment includes: the inner diameter of the PTFE sealing sleeve is adapted to the outer diameter of the transmission shaft, and a small gap between the PTFE sealing sleeve and the transmission shaft is used to reduce material leakage, thereby forming a first axial seal;

[0007] A further embodiment also includes: an oil seal is provided in the gap between the transmission shaft and the rotating hole on the outer side of the cover plate, and a second axial seal is formed by the oil seal.

[0008] In order to achieve the self-positioning effect of the sealing structure, the technical solution provided by the utility model includes: the cover plate is movably arranged on the transmission shaft, a threaded hole is opened on the surface of the mounting seat, and a circular hole is opened on the cover plate whose position is adapted to the threaded hole. The cover plate is installed to the threaded hole opened on the surface of the mounting seat by screws.

[0009] A further embodiment also includes: the screw is a hexagon socket head screw.

[0010] A further embodiment also includes: the screw is further provided to the cover plate and the mounting seat through an elastic washer.

[0011] A further embodiment also includes: the screw is further provided to the cover plate and the mounting seat through a flat washer.

[0012] A further embodiment also includes: a silicone pad is provided between the cover plate and the mounting seat.

[0013] The hexagon socket head screw passes through the elastic washer and the flat washer to tighten the cover plate and the silicone gasket to the mounting seat set on the surface of the ball bucket to achieve self-positioning sealing.

[0014] The advantages and beneficial effects of the utility model are:

[0015] 1. The PTFE sealing sleeve is set between the gap between the ball bucket and the drive shaft through the mounting seat and cover plate. By adjusting the wall thickness of the PTFE sealing sleeve, radial and axial sealing of the material is achieved. The addition of an oil seal further improves the axial sealing effect and reduces leakage and contamination of materials in the ball bucket.

[0016] 2. The cover is movably arranged on the transmission shaft, a circular hole is opened on the surface of the cover, and a threaded hole is opened on the surface of the mounting seat. Screws are used to pass through the elastic washer, flat washer, cover, and silicone pad in sequence to connect to the mounting seat. This allows the cover to have a certain degree of freedom without mechanical positioning. When the cover is installed on the mounting seat, the hexagon socket head screws and the threaded holes are easily positioned. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0018] Figure 2 This is a schematic cross-sectional view of an embodiment of the present invention along line AA;

[0019] Figure 3 This is a partial enlarged view of the cover plate of the embodiment of the utility model

[0020] Figure 4 This is a schematic cross-sectional view of an embodiment of the present invention along line BB;

[0021] Reference numerals:

[0022] 1-ball bucket, 2-drive shaft, 3-mounting seat, 4-cover plate, 5-rotating hole, 6-PTFE sealing sleeve, 7-oil seal, 8-threaded hole, 9-round hole, 10-screw, 11-elastic washer, 12-flat washer, 13-silicone pad. DETAILED DESCRIPTION

[0023] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] Example

[0025] See also Figures 1 to 4 A self-positioning sealing structure for a loss-in-weight feeder includes a ball bucket 1 and a transmission shaft 2 inserted into the ball bucket 1. A mounting seat 3 is fixedly provided at the position where the transmission shaft 2 is inserted outside the ball bucket 1. A cover plate 4 is provided outside the mounting seat 3. The transmission shaft 2 passes through a rotation hole 5 that passes through the cover plate 4. A PTFE sealing sleeve 6 is provided on the periphery of the transmission shaft 2 inside the cover plate 4. The outer diameter of the PTFE sealing sleeve 6 is adapted to the inner diameter of the rotation hole 5 to radially seal the material. The setting of the mounting seat 3 and the cover plate 4 not only provides operating space for the setting of the PTFE sealing sleeve 6, but also extends the vertical spatial distance between the transmission shaft 2 and the ball bucket 1, reducing the risk of material leakage. The setting of the PTFE sealing sleeve 6 reduces the gap between the transmission shaft 2 and the ball bucket 1. The gap between the PTFE sealing sleeve 6 and the transmission shaft 2 is small, which can cooperate to reduce material leakage and thus form a first axial seal, thereby improving the sealing effect.

[0026] An oil seal 7 is installed in the gap between the drive shaft 2 and the rotating hole 5 on the outside of the cover plate 4, forming a second axial seal. The oil seal 7 prevents material leakage and the intrusion of contaminants such as dust and dirt into the gap between the drive shaft 2 and the rotating hole 5. It also creates a lubricated environment, minimizing friction caused by the relative motion between the drive shaft 2 and the rotating hole 5, thereby extending the service life of the drive shaft 2.

[0027] The cover plate 4 is movably arranged on the transmission shaft 2, and a threaded hole 8 is opened on the surface of the mounting seat 3. The cover plate 4 is opened with a circular hole 9 whose position is adapted to the threaded hole 8. The cover plate 4 is installed to the threaded hole 8 opened on the surface of the mounting seat 3 by means of a screw 10; the screw 10 is a hexagon socket head screw; the screw 10 passes through the elastic washer 11, the flat washer 12, the cover plate 4 and the silicone pad 13 in sequence and is tightened to the threaded hole 8 set on the mounting seat 3. The screw 10 is not fixed to the cover plate 4 by mechanical positioning, but first passes through the elastic washer 11 to increase the friction of the screw 10 and improve the fastening effect; then passes through the flat washer 12 to increase the contact area between the screw 10 and the threaded hole 8, protecting the surface of the mounting seat 3 from damage; a silicone pad 13 is also provided between the cover plate 4 and the mounting seat 3. The silicone pad 13 has a certain elasticity, which not only plays a sealing role, but also reduces the bumps between the cover plate 4 and the mounting seat 3; the hexagon socket head screw passes through the elastic washer 11 and the flat washer 12 to tighten the cover plate 4 and the silicone pad 13 to the mounting seat 3 set on the surface of the ball bucket 1, so that the screw 10 has a certain degree of freedom, thereby realizing self-positioning sealing.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A self-positioning sealing structure for a loss-in-weight feeder, comprising a ball bucket and a transmission shaft inserted into the ball bucket, characterized in that: A mounting seat is fixedly provided at the position where the drive shaft is inserted on the outside of the ball bucket, and a cover plate is provided outside the mounting seat. The drive shaft passes through a rotating hole that penetrates the cover plate, and a PTFE sealing sleeve is provided on the periphery of the drive shaft inside the cover plate. The outer diameter of the PTFE sealing sleeve is adapted to the inner diameter of the rotating hole.

2. The self-positioning sealing structure of a loss-in-weight feeder according to claim 1, characterized in that: The inner diameter of the PTFE sealing sleeve is adapted to the outer diameter of the transmission shaft.

3. The self-positioning sealing structure of a loss-in-weight feeder according to claim 1, characterized in that: An oil seal is also provided in the gap between the transmission shaft and the rotating hole.

4. The self-positioning sealing structure of a loss-in-weight feeder according to claim 1, characterized in that: The cover plate is movably arranged on the transmission shaft, a threaded hole is provided on the surface of the mounting seat, a round hole is provided on the surface of the cover plate whose position is adapted to the threaded hole, and the cover plate is installed to the threaded hole provided on the surface of the mounting seat by a hexagon socket head screw.

5. The self-positioning sealing structure of the loss-in-weight feeder according to claim 4, characterized in that: The screws are also arranged on the cover plate and the mounting seat through elastic washers.

6. The self-positioning sealing structure of a loss-in-weight feeder according to claim 4 or 5, characterized in that: The screws are also set to the cover plate and the mounting seat through flat washers.

7. The self-positioning sealing structure of a loss-in-weight feeder according to claim 6, characterized in that: A silica gel pad is further provided between the cover plate and the mounting seat.

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