Sealing device of screw conveyer and automatic weighing screw conveyer

Abstract

The utility model relates to the technical field of sealing devices, in particular to a sealing device of a screw conveyer and an automatic weighing screw conveyer. According to the specific technical scheme, the sealing device of the spiral conveyor comprises a spiral shaft, the spiral shaft is sleeved with a sealing ring base, a shaft seal is coaxially arranged on the sealing ring base in an embedded mode, the spiral shaft is sleeved with a polytetrafluoroethylene hollow pad, one side of the polytetrafluoroethylene hollow pad is tightly attached to the shaft seal, and the other side of the polytetrafluoroethylene hollow pad is tightly attached to the shaft seal. A gland is coaxially arranged on the other side of the polytetrafluoroethylene hollow pad, and the gland, the polytetrafluoroethylene hollow pad and the sealing ring base are fixed through bolts. The utility model solves the problem of material leakage at the sealing part of the shaft seal of the screw shaft of the screw conveyer in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing devices, in particular to a sealing device of a screw conveyor and an automatic weighing screw conveyor. Background Art

[0002] In the mineral processing, smelting, chemical industry and other industries, screw conveyor is a commonly used equipment. The quality of its design and manufacturing directly affects the safe and stable operation of the system. In the operation of some systems, the continuous and stable operation of the feeding device plays a decisive role in the system production. In the automatic packaging industry of solid materials, material weighing is for the screw conveyor to convey materials. Because the particles of the packaging materials are small, when the screw conveyor conveys materials, tiny solid particles will drill into the shaft seal of the rotating shaft, causing the material to leak out of the screw conveyor's screw shaft seal, wearing the shaft seal and screw shaft. The shaft seal and screw shaft have a short service life and need to be replaced frequently, with a large maintenance workload, material leakage, and a poor on-site working environment. Summary of the invention

[0003] In view of the deficiencies of the prior art, the utility model provides a sealing device for a screw conveyor and an automatic weighing screw conveyor, which solves the problem of material leakage at the seal of the screw shaft of the screw conveyor in the prior art.

[0004] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] The utility model discloses a sealing device for a screw conveyor, comprising a screw shaft, a sealing ring base is sleeved on the screw shaft, a shaft seal is coaxially and embedded on the sealing ring base, a polytetrafluoroethylene hollow pad is sleeved on the screw shaft, one side of the polytetrafluoroethylene hollow pad is tightly against the shaft seal, a pressure cover is coaxially arranged on the other side of the polytetrafluoroethylene hollow pad, and the pressure cover, the polytetrafluoroethylene hollow pad and the sealing ring base are fixed by bolts.

[0006] Preferably, an annular groove is provided on the sealing ring base, a rubber pad is provided in the annular groove, the shaft seal is provided in the annular groove and is tightly attached to the rubber pad, and the spiral shaft passes through the center of the rubber pad.

[0007] Preferably, the side of the shaft seal exposed from the sealing ring base is flush with the side of the sealing ring base.

[0008] Preferably, an open cavity is arranged around the spiral shaft on one side of the polytetrafluoroethylene hollow gasket facing the shaft seal, and a through hole communicating with the cavity is arranged on the side wall of the polytetrafluoroethylene hollow gasket.

[0009] Preferably, the cavity is coaxially arranged with the spiral axis, and the spiral axis is located in the area where the cavity is located.

[0010] Correspondingly, the automatic weighing screw conveyor includes a speed regulating reducer, the speed regulating reducer is connected to a screw shaft, the screw shaft is respectively provided with a front bearing seat and a rear bearing seat, and the screw shaft near the front bearing seat and the rear bearing seat is provided with the above-mentioned sealing device of the screw conveyor.

[0011] Preferably, the spiral shaft is arranged in the cylinder, and a silo and a box body communicated with the cylinder are respectively arranged at both ends of the cylinder, and a first spiral blade is arranged on the spiral shaft located in the silo and the cylinder.

[0012] Preferably, a second spiral blade is provided on the spiral shaft located in the housing, and the rotation direction of the second spiral blade is opposite to that of the first spiral blade.

[0013] Preferably, the sealing devices are respectively arranged at the starting end of the cylinder and the tail end of the spiral shaft passing through the outside of the box.

[0014] Preferably, a base is provided at the bottom of the cylinder, below the silo, an electronic scale is provided in the box, and a discharge port is provided at the bottom of the box.

[0015] The utility model has the following beneficial effects:

[0016] The utility model provides a sealing ring base on the spiral shaft, a rubber pad and a shaft seal are installed on the sealing ring base, and then a polytetrafluoroethylene hollow pad and a gland are installed in sequence and fixed by bolts; at the same time, a cavity is provided on the polytetrafluoroethylene hollow pad, a through hole communicating with the cavity is provided on the side wall thereof, an air duct is connected to the through hole, and high-pressure air is filled into the cavity. Under the joint action of the rubber pad, the shaft seal and the inner cavity of the polytetrafluoroethylene hollow pad being filled with high-pressure air, materials are prevented from drilling into the sealing device, causing material leakage and wearing the spiral shaft, the rubber pad and the shaft seal, so as to realize long-term operation of the screw conveyor. The device is simple to manufacture, low in cost, strong in operability, low in technical requirements and reliable in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the sealing device of the utility model;

[0018] Figure 2 This is the structural diagram of the automatic weighing screw conveyor;

[0019] In the figure: 1-speed regulating reducer, 2-screw shaft, 3-front bearing seat, 4-sealing ring base, 5-silo, 6-first spiral blade, 7-cylinder, 8-box, 9-second spiral blade, 10-rear bearing seat, 11-discharge port, 12-base, 13-pressure cover, 14-PTFE hollow pad, 15-through hole, 16-rubber pad, 17-shaft seal, 18-bolt, 19-cavity. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0022] refer to Figure 1 The utility model discloses a sealing device for a screw conveyor, comprising a screw shaft 2, a sealing ring base 4 is sleeved on the screw shaft 2, a shaft seal 17 is coaxially and embedded on the sealing ring base 4, a PTFE hollow pad 14 is sleeved on the screw shaft 2, one side of the PTFE hollow pad 14 is in close contact with the shaft seal 17, a gland 13 is coaxially arranged on the other side of the PTFE hollow pad 14, and the gland 13, the PTFE hollow pad 14 and the sealing ring base 4 are fixed by bolts 18. During the rotation of the screw shaft, the entire sealing device is stationary.

[0023] Further: the sealing ring base 4 is provided with an annular groove, a rubber pad 16 is provided in the annular groove, the shaft seal 17 is provided in the annular groove and is close to the rubber pad 16, and the spiral shaft 2 passes through the center of the rubber pad 16. It should be noted that: the annular groove can be understood as a circular groove, which is provided at the axis of the sealing ring base, the spiral shaft axially passes through the bottom of the annular groove, and the rubber pad passes through the spiral shaft and is placed in the annular groove, the shaft seal 17 is provided in the annular groove to fix the rubber pad 16, and at the same time, the side of the shaft seal 17 exposed from the sealing ring base 4 is flush with the side of the sealing ring base 4, that is, the side of the shaft seal located at the opening of the annular groove is flush with the side of the sealing ring base. The polytetrafluoroethylene hollow pad provided on the spiral shaft presses the shaft seal, and then the pressure cover is installed, so that the bolts fix the rubber pad, the shaft seal, and the polytetrafluoroethylene hollow pad as a whole.

[0024] Furthermore, the PTFE hollow pad 14 is provided with an open cavity 19 on one side facing the shaft seal 17 and around the screw shaft 2. A through hole 15 communicating with the cavity 19 is provided on the side wall of the PTFE hollow pad 14, and the through hole is connected to the air duct. The cavity 19 is coaxially arranged with the screw shaft 2, and the screw shaft 2 is located in the area where the cavity 19 is located. During operation, high-pressure wind is connected from the through hole, and the wind pressure is 1-3 atmospheres. The cavity of the PTFE hollow pad is filled with high-pressure wind. The combined effect of the rubber pad, the shaft seal, and the inner cavity of the PTFE hollow pad being filled with high-pressure wind prevents materials from drilling into the sealing device, causing material leakage, and wearing the screw shaft, rubber pad, and shaft seal, thereby realizing long-term operation of the screw conveyor.

[0025] refer to Figure 2 As shown, as one of the embodiments, the sealing device can be used in a screw conveyor, and of course can also be used in other equipment with the same requirements.

[0026] The invention is used for an automatic weighing screw conveyor, and comprises a speed reducing machine 1, which is connected to a screw shaft 2 through a key bar to provide power for the screw shaft 2. The screw shaft 2 is provided with a front bearing seat 3 and a rear bearing seat 10 for fixing the screw shaft, and the screw shaft 2 near the front bearing seat 3 and the rear bearing seat 10 is provided with the above-disclosed sealing device, that is, the sealing device is provided at both ends of the screw shaft to prevent material leakage.

[0027] Furthermore, the spiral shaft 2 is arranged in the cylinder 7, the cylinder is arranged horizontally, and the two ends of the cylinder 7 are respectively provided with a silo 5 and a box 8 which are communicated with the cylinder 7, and the spiral shaft 2 located in the silo 5 and the cylinder 7 is provided with a first spiral blade 6. It should be noted that: the silo and the box are arranged between two sealing devices, and the front bearing seat is fixed on the side wall of the silo, and the rear bearing seat is fixed on the side wall of the box. The sealing devices are respectively arranged at the starting end of the cylinder 7 and the tail end of the spiral shaft 2 passing through the outside of the box 8.

[0028] Furthermore, a second spiral blade 9 is provided on the spiral shaft 2 in the box 8, and the rotation direction of the second spiral blade 9 is opposite to that of the first spiral blade 6. It should be noted that the second spiral blade is provided at the tail end of the spiral shaft in the box, and the rotation directions of the two spiral blades are opposite. The second spiral blade forms a reverse conveyance for the material, and conveys the material in the silo to the discharge port, so as to avoid the accumulation and crystallization of the material causing the tail of the screw conveyor to be blocked or blocked, and ensure the continuous and normal operation of the screw conveyor.

[0029] Furthermore, the silo is arranged at the top of the cylinder and at the starting end of the cylinder, and a base 12 is arranged at the bottom of the cylinder 7 and below the silo 5 to support the cylinder. An electronic scale is arranged in the box 8 (not shown in the figure, the arrangement is the existing design), and a discharge port 11 is arranged at the bottom of the box 8.

[0030] When the automatic weighing screw conveyor is working, the speed reducer 1 is turned on to drive the screw shaft 2 to rotate, and the material in the silo 5 is sent to the electronic scale. When the material on the electronic scale is close to the set metering value, the speed reducer 1 automatically slows down to ensure accurate weighing of the electronic scale. When the weighing set value is reached, the speed reducer 1 automatically stops conveying the material, completing the automatic weighing and unloading of the material, and the material enters the packaging bag from the discharge port.

[0031] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A sealing device for a screw conveyor, comprising a screw shaft (2), characterized in that: The spiral shaft (2) is sleeved with a sealing ring base (4), a shaft seal (17) is coaxially and embedded in the sealing ring base (4), a polytetrafluoroethylene hollow gasket (14) is sleeved with the spiral shaft (2), one side of the polytetrafluoroethylene hollow gasket (14) is in close contact with the shaft seal (17), and a gland (13) is coaxially arranged on the other side of the polytetrafluoroethylene hollow gasket (14), and the gland (13), the polytetrafluoroethylene hollow gasket (14) and the sealing ring base (4) are fixed by bolts (18).

2. A sealing device for a screw conveyor according to claim 1, characterized in that: An annular groove is provided on the sealing ring base (4), a rubber pad (16) is provided in the annular groove, the shaft seal (17) is provided in the annular groove and is tightly attached to the rubber pad (16), and the spiral shaft (2) passes through the center of the rubber pad (16).

3. A sealing device for a screw conveyor according to claim 2, characterized in that: The side surface of the shaft seal (17) exposed from the sealing ring base (4) is flush with the side surface of the sealing ring base (4).

4. The sealing device of a screw conveyor according to claim 1, characterized in that: An open cavity (19) is provided on one side of the tetrafluoroethylene hollow gasket (14) facing the shaft seal (17) and surrounding the spiral shaft (2), and a through hole (15) communicating with the cavity (19) is provided on a side wall of the tetrafluoroethylene hollow gasket (14).

5. The sealing device of a screw conveyor according to claim 4, characterized in that: The cavity (19) is coaxially arranged with the spiral axis (2), and the spiral axis (2) is located in the area where the cavity (19) is located.

6. Automatic weighing screw conveyor, characterized by: The invention comprises a speed regulating reducer (1), the speed regulating reducer (1) being connected to a screw shaft (2), the screw shaft (2) being provided with a front bearing seat (3) and a rear bearing seat (10), respectively, and a sealing device for a screw conveyor according to any one of claims 1 to 5 being provided on the screw shaft (2) near the front bearing seat (3) and the rear bearing seat (10).

7. The automatic weighing screw conveyor according to claim 6, characterized in that: The spiral shaft (2) is arranged in a cylinder (7), and a material bin (5) and a box (8) which are in communication with the cylinder (7) are respectively arranged at both ends of the cylinder (7), and a first spiral blade (6) is arranged on the spiral shaft (2) located in the material bin (5) and the cylinder (7).

8. The automatic weighing screw conveyor according to claim 7, characterized in that: A second spiral blade (9) is provided on the spiral shaft (2) located in the housing (8), and the rotation direction of the second spiral blade (9) is opposite to that of the first spiral blade (6).

9. The automatic weighing screw conveyor according to claim 7, characterized in that: The sealing devices are respectively arranged at the starting end of the cylinder (7) and the tail end of the spiral shaft (2) passing through the outside of the box (8).

10. The automatic weighing screw conveyor according to claim 7, characterized in that: A base (12) is provided at the bottom of the cylinder (7) and below the silo (5); an electronic scale is provided in the box (8); and a discharge port (11) is provided at the bottom of the box (8).

Images