Connecting structure of spiral sampling head and speed reducer

Abstract

A kind of connecting structure of spiral sampling head and speed reducer, including speed reducer, main shaft, bearing seat, speed reducer is fixedly connected on lifting trolley, there is lower connecting disc on lifting trolley and is fixedly connected, bearing seat is fixedly installed with two sets of bearings of upper and lower, the main shaft is processed with a section of external thread near upper section, the main shaft is tightly fitted and passes the inner ring of two sets of bearings of upper and lower, axial locating nut is screwed on the external thread, the upper end of main shaft, the lower end of the output shaft of speed reducer are all connected on a rigid coupling, bearing seat is fixedly connected on lower connecting disc by lower connecting disc connecting bolt.The connecting structure is reliable, easy to disassemble when maintaining, and there is no security risk.

Description

Technical Field

[0001] This utility model relates to a spiral sampler, and in particular to a connection structure between a spiral sampling head and a reducer, belonging to the field of sampling machinery technology. Background Technology

[0002] Spiral sampling heads are used in fully automatic sampling machines, primarily for the automatic sampling of incoming coal, such as truck sampling and train sampling. The main structure of the spiral sampling head is the spiral shaft, located inside the sampling cylinder. The spiral shaft is made by welding spiral blades onto the main shaft. The upper part of the sampling cylinder has a discard port and a retention port. A retention hopper is fixedly installed on the sampling cylinder outside the retention port. A valve is closed at the discharge port of the retention hopper, and the valve is opened and closed by a thruster. As the spiral sampling head descends, the rotation of the spiral shaft lowers the coal sample, which is then transported to the retention hopper. A three-dimensional moving mechanism then moves the sample to a set position and places it into the appropriate equipment. The spiral sampling head needs to be driven by a motor with a reducer. Therefore, the main shaft of the spiral sampling head needs to be connected to the output shaft of the reducer to achieve power transmission. Traditional connection mechanisms between the main shaft and the reducer are as follows: Figure 3 As shown, the reducer 1 is fixedly connected to the lifting trolley 8. A lower connecting plate 3 is fixedly connected to the lifting trolley. Two sets of radially positioned bearings are installed in the bearing housing 4. The bushing and the inner ring of the bearing are tightly fitted. The lower end of the bushing has a flange. The upper end of the main shaft extends into the bushing and is fixed to the bushing by the flange connecting bolt 11. Then, the output shaft of the reducer is fixedly connected to the bushing. The bearing housing and the lower connecting plate are then fixedly connected by the lower connecting plate connecting bolt. The sampling tube is fixedly connected to the bearing housing. In the traditional connection method, power is transmitted through the bushing 10. However, in long-term use... In practice, the following improvements were found in this connection method: First, disassembly is inconvenient and labor-intensive during maintenance; second, the main shaft is fixedly connected to the bushing via flange bolts. The flange bolts are located in the enclosed space within the bearing housing. Over long-term use, the flange bolts may loosen, and because they are in a non-visible range, they cannot be detected. The machine head is at least 4 meters above the ground during use. If the flange bolts loosen, the continued operation of the equipment will lead to serious mechanical failures and may also cause safety issues. To address these problems, the structure must be optimized. Summary of the Invention

[0003] The purpose of this invention is to provide a connection structure between a spiral sampling head and a speed reducer.

[0004] To achieve the purpose of this utility model, the following technical solution is adopted: a connection structure between a spiral sampling head and a reducer, including a reducer, a main shaft, and a bearing housing. The reducer is fixedly connected to a lifting trolley, and a lower connecting plate is fixedly connected to the lifting trolley. Two sets of bearings are fixedly installed in the bearing housing. The main shaft has an external thread machined near the upper section. The main shaft passes tightly through the inner rings of the upper and lower sets of bearings. An axial positioning nut is screwed onto the external thread. The upper end of the main shaft and the lower end of the output shaft of the reducer are both connected to a rigid coupling. The bearing housing is fixedly connected to the lower connecting plate by connecting bolts.

[0005] Furthermore, the outer diameter of the rigid coupling is smaller than the connection stop between the bearing housing and the lower connecting plate.

[0006] Furthermore, the main shaft has a shoulder that abuts against a bearing in the lower part of the bearing housing.

[0007] The positive and beneficial technical effects of this utility model are as follows: the connection structure is reliable, easy to disassemble during maintenance, and there are no safety hazards. This will be explained in detail with reference to specific implementation methods. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall connection structure on the spiral sampling head.

[0009] Figure 2 yes Figure 1 Enlarged diagram of the middle section.

[0010] Figure 3 This is a schematic diagram of a traditional connection structure. Detailed Implementation

[0011] To more fully explain the implementation of this utility model, implementation examples are provided. These implementation examples are merely illustrative of this utility model and do not limit its scope.

[0012] The present invention will be further explained in detail with reference to the accompanying drawings, in which the following references are given: 1: reducer; 2: rigid coupling; 3: lower connecting plate; 4: bearing housing; 5: bearing; 6: main shaft; 7: sampling cylinder; 8: lifting trolley; 9: positioning nut; 10: bushing; 11: flange connecting bolt; 12: shaft shoulder; 13: lower connecting plate connecting bolt.

[0013] As shown in the attached figure, a connection structure between a spiral sampling head and a reducer includes a reducer 1, a main shaft 6, and a bearing housing 4. The reducer 1 is fixedly connected to a lifting trolley 8, and a lower connecting plate 3 is fixedly connected to the lifting trolley. Two sets of bearings 5 ​​are fixedly installed inside the bearing housing. The main shaft has an external thread machined near the upper section. The main shaft 6 passes tightly through the inner rings of the upper and lower sets of bearings. The main shaft has a shoulder 12, which abuts against the bearing in the lower part of the bearing housing. This can better limit the axial movement of the main shaft. An axial positioning nut 9 is screwed onto the external thread. Neither the positioning nut nor the shoulder affects the rotation of the bearing. The upper end of the main shaft and the lower end of the output shaft of the reducer are both connected to a rigid coupling 2. The bearing housing is fixedly connected to the lower connecting plate by a lower connecting plate connecting bolt 13.

[0014] As a further optimization, the outer diameter of the rigid coupling is smaller than the connection stop between the bearing housing and the lower connecting plate, making it easier to disassemble during maintenance.

[0015] When it is necessary to disassemble the sampling head, first use a chain hoist to lift the sampling head, remove the connecting bolts on the rigid coupling, and then remove the connecting bolts on the lower connecting plate of the fixed bearing seat. The entire sampling head and sampling cylinder can then be unloaded to the ground, which facilitates subsequent ground disassembly or workshop disassembly and greatly reduces the labor intensity of sampling head replacement.

[0016] After a detailed description of the embodiments of this utility model, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent applications. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the scope of the technical solution of this utility model, and this utility model is not limited to the embodiments of the examples given in the specification.

Claims

1. A connecting structure of a spiral sampling head and a speed reducer, comprising a speed reducer, a main shaft and a bearing seat, the speed reducer is fixedly connected on a lifting trolley, a lower connecting disc is fixedly connected on the lifting trolley, and two sets of bearings are fixedly installed in the bearing seat, characterized in that: The main shaft has an external thread near the upper section. The main shaft fits tightly through the inner rings of the upper and lower bearings. An axial positioning nut is screwed onto the external thread. The upper end of the main shaft and the lower end of the output shaft of the reducer are both connected to a rigid coupling. The bearing housing is fixedly connected to the lower connecting plate by connecting bolts.

2. The connecting structure of the spiral sampling head and the speed reducer according to claim 1, characterized in that: The outer diameter of the rigid coupling is smaller than the connection stop between the bearing housing and the lower connecting plate.

3. The connecting structure of the spiral sampling head and the speed reducer according to claim 1, characterized in that: The main shaft has a shoulder that abuts against the bearing in the lower part of the bearing housing.

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