Wear-resisting and stress-preventing device for screw mandrel

Abstract

The utility model discloses a screw mandrel wear-resisting stress-preventing device which comprises a speed reducer, one side of the speed reducer is connected with a wear-resisting mechanism, the wear-resisting mechanism is connected with a sealing assembly, the sealing assembly is arranged close to the speed reducer, the other side of the speed reducer is connected with a positioning mechanism, and the positioning mechanism is connected with the wear-resisting mechanism. The diameter change of the screw mandrel forging blank is zero, compared with a traditional screw mandrel blank with a large step, the problem of stress at the root of the diameter change position does not exist, defects of raw materials are smaller, the service life is longer, water in materials is not prone to leakage, the service life of the screw mandrel can be prolonged, and production cost is reduced. The sealing reliability in long-time use is improved, and the equipment replacement cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of synthetic rubber processing equipment, and particularly relates to a wear-resistant and stress-resistant device for a screw core shaft. Background Art

[0002] In the extrusion dryer, synthetic rubber uses the expansion principle to remove some of the water outside the rubber and some of the water contained in the rubber. However, the stress is concentrated at the tail of the screw core shaft in the extrusion dryer, which is prone to microcracks after long-term use. The microcracks then expand and lead to breakage. The long-term friction of the sealing packing on the screw core shaft causes grooves to appear at this position, affecting the sealing effect. Utility Model Content

[0003] The utility model aims to provide a wear-resistant and stress-resistant device for a screw core shaft, which solves the problem that the existing screw core shaft is prone to cracks after long-term use.

[0004] The technical solution adopted by the utility model is that the screw core shaft wear-resistant and stress-resistant device includes a reducer, one side of the reducer is connected to a wear-resistant mechanism, the wear-resistant mechanism is connected to a sealing assembly, the sealing assembly is arranged close to the reducer, and the other side of the reducer is connected to a positioning mechanism, and the positioning mechanism is connected to the wear-resistant mechanism.

[0005] The utility model is also characterized in that:

[0006] The wear-resistant mechanism includes a screw core shaft, the shaft body of the screw core shaft is sleeved with a wear-resistant sleeve, the screw core shaft is connected to the reducer, the wear-resistant sleeve is connected to the sealing assembly, and the end of the screw core shaft is connected to the positioning mechanism.

[0007] One end of the screw core shaft is connected to the hollow shaft of the reducer, the shaft body of the screw core shaft is provided with a step, one side of the wear-resistant sleeve is in close contact with the step, and the other side of the wear-resistant sleeve is in close contact with the reducer.

[0008] The sealing assembly includes a connecting sleeve filled with sealing packing, the sealing packing is connected to the connecting sleeve through a gland, the connecting sleeve is sleeved on the wear-resistant sleeve, and one side of the connecting sleeve is connected to the reducer.

[0009] The positioning mechanism includes a tightening bolt which passes through the reducer. A tightening hole is provided at the end of the screw core shaft. The end of the tightening bolt which is arranged in the reducer is connected with the tightening hole.

[0010] A positioning sleeve is connected to one side of the reducer, and the tightening bolt passes through the positioning sleeve. The positioning sleeve is arranged between the end of the tightening bolt away from the screw core shaft and the reducer.

[0011] The beneficial effects of the utility model are:

[0012] The utility model discloses a wear-resistant and stress-proof device for the screw core shaft. The diameter change of the screw core shaft forging blank is zero. Compared with the traditional screw core shaft blank with a large step, there is no stress problem at the root where the diameter changes. The raw material defects are smaller and the service life is longer. The moisture in the material is not easy to leak. The service life of the screw core shaft can be increased, the sealing reliability of long-term use is improved, and the cost of equipment replacement is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an exploded view of the wear-resistant and stress-resistant device for the screw mandrel of the utility model;

[0014] Figure 2 This is a cross-sectional view of the utility model screw core shaft wear-resistant and stress-resistant device;

[0015] Figure 3 This is a structural diagram of the wear-resistant component in the wear-resistant and stress-resistant device for the screw mandrel of the utility model;

[0016] Figure 4 It is a structural schematic diagram of the sealing component in the screw core shaft wear-resistant and stress-resistant device of the utility model.

[0017] In the figure: 1. reducer, 2. screw core shaft, 21. step, 3. wear-resistant sleeve, 4. connecting sleeve, 5. sealing packing, 6. gland, 7. tightening bolt, 8. tightening hole, 9. positioning sleeve. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] The utility model provides a screw core shaft wear-resistant and stress-resistant device, such as Figure 1-2 As shown, it includes a reducer 1, a wear-resistant mechanism connected to one side of the reducer 1, and a sealing assembly connected to the wear-resistant mechanism. The sealing assembly is arranged near the reducer 1, and a positioning mechanism is connected to the other side of the reducer 1. The positioning mechanism is connected to the wear-resistant mechanism. The wear-resistant mechanism is connected to the reducer 1 to prevent cracks from forming at the tail of the screw core shaft during long-term operation. The wear-resistant mechanism contacts the wear-resistant structure through the sealing assembly. The sealing assembly is filled with sealing packing. The sealing packing prevents direct contact between the wear-resistant mechanism and the sealing assembly, reducing wear of the wear-resistant mechanism. The wear-resistant mechanism is tightened through the positioning mechanism.

[0020] Example 1

[0021] The screw core shaft wear-resistant and stress-resistant device includes a reducer 1, one side of the reducer 1 is connected to a wear-resistant mechanism, the wear-resistant mechanism is connected to a sealing component, the sealing component is arranged close to the reducer 1, and the other side of the reducer 1 is connected to a positioning mechanism, which is connected to the wear-resistant mechanism.

[0022] like Figure 3As shown, the wear-resistant mechanism includes a screw core shaft 2, the shaft body of which is sleeved with a wear-resistant sleeve 3. The screw core shaft 2 is connected to the reducer 1, the wear-resistant sleeve 3 is connected to the sealing assembly, and the end of the screw core shaft 2 is connected to the positioning mechanism. The screw core shaft 2 and the wear-resistant sleeve 3 are shrink-fitted. After heating, the wear-resistant sleeve 3 is quickly inserted into the screw core shaft 2, and the end of the screw core shaft 2 near the wear-resistant sleeve 3 is inserted into the reducer 1.

[0023] One end of the screw core shaft 2 is connected to the hollow shaft of the reducer 1. The shaft body of the screw core shaft 2 is provided with a step 21. One side of the wear-resistant sleeve 3 is in close contact with the step 21, and the other side of the wear-resistant sleeve 3 is in close contact with the reducer 1. The front end face of the wear-resistant sleeve 3 is close to and aligned with the step 21, and the rear end face of the wear-resistant sleeve 3 is in close contact with the front end face of the hollow shaft of the reducer 1.

[0024] Example 2

[0025] The screw core shaft wear-resistant and stress-resistant device includes a reducer 1, one side of the reducer 1 is connected to a wear-resistant mechanism, the wear-resistant mechanism is connected to a sealing component, the sealing component is arranged close to the reducer 1, and the other side of the reducer 1 is connected to a positioning mechanism, which is connected to the wear-resistant mechanism.

[0026] The wear-resistant mechanism includes a screw core shaft 2, the shaft body of the screw core shaft 2 is sleeved with a wear-resistant sleeve 3, the screw core shaft 2 is connected to the reducer 1, the wear-resistant sleeve 3 is connected to the sealing assembly, and the end of the screw core shaft 2 is connected to the positioning mechanism.

[0027] One end of the screw core shaft 2 is connected to the hollow shaft of the reducer 1. The shaft body of the screw core shaft 2 is provided with a step 21. One side of the wear-resistant sleeve 3 is in close contact with the step 21, and the other side of the wear-resistant sleeve 3 is in close contact with the reducer 1.

[0028] like Figure 4 As shown, the sealing assembly includes a connecting sleeve 4, which is filled with sealing packing 5. The sealing packing 5 is connected to the connecting sleeve 4 through a gland 6. The connecting sleeve 4 is sleeved on the wear-resistant sleeve 3, and one side of the connecting sleeve 4 is connected to the reducer 1. A through hole is opened in the middle of the gland 6 to facilitate the passage of the screw core shaft 2. The gland 6 is connected to the connecting sleeve 4 through bolts and nuts, and the sealing packing 5 is connected to the connecting sleeve 4. The sealing packing 5 is in direct contact with the carbide layer on the wear-resistant sleeve 3, which wears the wear-resistant sleeve 3 less and slower, and has a longer service life.

[0029] Example 3

[0030] The screw core shaft wear-resistant and stress-resistant device includes a reducer 1, one side of the reducer 1 is connected to a wear-resistant mechanism, the wear-resistant mechanism is connected to a sealing component, the sealing component is arranged close to the reducer 1, and the other side of the reducer 1 is connected to a positioning mechanism, which is connected to the wear-resistant mechanism.

[0031] The wear-resistant mechanism includes a screw core shaft 2, the shaft body of the screw core shaft 2 is sleeved with a wear-resistant sleeve 3, the screw core shaft 2 is connected to the reducer 1, the wear-resistant sleeve 3 is connected to the sealing assembly, and the end of the screw core shaft 2 is connected to the positioning mechanism.

[0032] One end of the screw core shaft 2 is connected to the hollow shaft of the reducer 1. The shaft body of the screw core shaft 2 is provided with a step 21. One side of the wear-resistant sleeve 3 is in close contact with the step 21, and the other side of the wear-resistant sleeve 3 is in close contact with the reducer 1.

[0033] The sealing assembly includes a connecting sleeve 4 filled with a sealing packing 5, which is connected to the connecting sleeve 4 through a gland 6. The connecting sleeve 4 is sleeved on the wear-resistant sleeve 3, and one side of the connecting sleeve 4 is connected to the reducer 1.

[0034] The positioning mechanism includes a tensioning bolt 7, which passes through the reducer 1. The end of the screw core shaft 2 is provided with a tensioning hole 8, and the end of the tensioning bolt 7 disposed in the reducer 1 is connected to the tensioning hole 8. The tensioning bolt 7 is connected to the tensioning hole 8 to stabilize the screw core shaft 2.

[0035] Example 4

[0036] The screw core shaft wear-resistant and stress-resistant device includes a reducer 1, one side of the reducer 1 is connected to a wear-resistant mechanism, the wear-resistant mechanism is connected to a sealing component, the sealing component is arranged close to the reducer 1, and the other side of the reducer 1 is connected to a positioning mechanism, which is connected to the wear-resistant mechanism.

[0037] The wear-resistant mechanism includes a screw core shaft 2, the shaft body of the screw core shaft 2 is sleeved with a wear-resistant sleeve 3, the screw core shaft 2 is connected to the reducer 1, the wear-resistant sleeve 3 is connected to the sealing assembly, and the end of the screw core shaft 2 is connected to the positioning mechanism.

[0038] One end of the screw core shaft 2 is connected to the hollow shaft of the reducer 1. The shaft body of the screw core shaft 2 is provided with a step 21. One side of the wear-resistant sleeve 3 is in close contact with the step 21, and the other side of the wear-resistant sleeve 3 is in close contact with the reducer 1.

[0039] The sealing assembly includes a connecting sleeve 4 filled with a sealing packing 5, which is connected to the connecting sleeve 4 through a gland 6. The connecting sleeve 4 is sleeved on the wear-resistant sleeve 3, and one side of the connecting sleeve 4 is connected to the reducer 1.

[0040] The positioning mechanism includes a tightening bolt 7 , which passes through the reducer 1 . A tightening hole 8 is formed at the end of the screw core shaft 2 , and the end of the tightening bolt 7 disposed in the reducer 1 is connected to the tightening hole 8 .

[0041] A positioning sleeve 9 is connected to one side of the reducer 1, and the tensioning bolt 7 passes through the positioning sleeve 9. The positioning sleeve 9 is arranged between the end of the tensioning bolt 7 away from the screw core shaft 2 and the reducer 1. The role of the positioning sleeve 9 is similar to that of a gasket, preventing the tensioning bolt 7 from wearing the reducer 1 during the process of tightening the screw core shaft 2.

[0042] The working principle of the utility model screw core shaft wear-resistant and stress-resistant device is as follows:

[0043] When the screw core shaft 2 is working, it is subjected to a backward axial force. This force is transmitted to the axial force-bearing surface at the step 21 on the screw core shaft 2 and the shrink-fit cylindrical surface, and then transmitted to the hollow shaft of the reducer 1 through the wear-resistant sleeve 3. The carbide layer on the wear-resistant sleeve 3 and the sealing packing 5 wear against each other, which reduces wear and prolongs the service life. After long-term use, the screw core shaft 2 has no micro cracks.

[0044] The utility model discloses a wear-resistant and stress-proof device for the screw core shaft. The diameter change of the screw core shaft forging blank is zero. Compared with the traditional screw core shaft blank with a large step, there is no stress problem at the root where the diameter changes. The raw material defects are smaller and the service life is longer. The moisture in the material is not easy to leak. The service life of the screw core shaft can be increased, the sealing reliability of long-term use is improved, and the cost of equipment replacement is reduced.

Claims

1. The screw core shaft wear-resistant and stress-resistant device is characterized by: The invention comprises a reducer (1), wherein one side of the reducer (1) is connected to a wear-resistant mechanism, the wear-resistant mechanism is connected to a sealing assembly, the sealing assembly is arranged close to the reducer (1), and the other side of the reducer (1) is connected to a positioning mechanism, the positioning mechanism is connected to the wear-resistant mechanism; The wear-resistant mechanism comprises a screw core shaft (2), the shaft body of the screw core shaft (2) is sleeved with a wear-resistant sleeve (3), the screw core shaft (2) is connected to the reducer (1), the wear-resistant sleeve (3) is connected to the sealing assembly, and the end of the screw core shaft (2) is connected to the positioning mechanism; One end of the screw core shaft (2) is connected to the hollow shaft of the reducer (1), the shaft body of the screw core shaft (2) is provided with a step (21), one side of the wear-resistant sleeve (3) is in close contact with the step (21), and the other side of the wear-resistant sleeve (3) is in close contact with the reducer (1); The sealing assembly comprises a connecting sleeve (4), the connecting sleeve (4) is filled with a sealing packing (5), the sealing packing (5) is connected to the connecting sleeve (4) through a gland (6), the connecting sleeve (4) is sleeved on the wear-resistant sleeve (3), and the reducer (1) is connected to one side of the connecting sleeve (4).

2. The screw core shaft wear-resistant and stress-resistant device according to claim 1, characterized in that: The positioning mechanism comprises a tightening bolt (7), the tightening bolt (7) passes through the reducer (1), a tightening hole (8) is provided at the end of the screw core shaft (2), and the end of the tightening bolt (7) arranged in the reducer (1) is connected to the tightening hole (8).

3. The wear-resistant and stress-resistant device for the screw mandrel according to claim 2, characterized in that: A positioning sleeve (9) is connected to one side of the reducer (1), the tensioning bolt (7) passes through the positioning sleeve (9), and the positioning sleeve (9) is arranged between the end of the tensioning bolt (7) away from the screw core shaft (2) and the reducer (1).

Images