Main shaft assembly of centrifugal machine

Abstract

The utility model discloses a centrifuge main shaft assembly which comprises a bearing seat, a main shaft and a lifting shaft, the bearing seat is installed on the main shaft, a first counter bore and a second counter bore are formed in the two ends of the main shaft respectively, and a first shaft sleeve and a second shaft sleeve are embedded in the first counter bore and the second counter bore respectively. The lifting shaft sequentially penetrates through center holes of the first shaft sleeve, the spindle and the second shaft sleeve and is coaxial with the spindle, and an oil-containing groove is formed in the inner wall of the first shaft sleeve. According to the utility model, the first shaft sleeve and the second shaft sleeve in the main shaft are in head-to-tail sleeving connection with the lifting shaft, so that the amplitude and frequency of vibration generated by the lifting shaft during working are reduced, the stability of the lifting shaft is improved, and the concentricity and clearance adaptation degree between the lifting shaft and the main shaft during up-and-down movement are improved; and the oil-containing groove body is formed in the inner wall of the second center hole part, so that the friction force between the lifting shaft and the shaft sleeve is reduced, the phenomena that the lifting shaft is locked and damaged due to friction are avoided, and the centrifugal operation stability of the centrifugal machine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifuges, in particular to a centrifuge main shaft assembly. Background Art

[0002] The drum is an important component of the centrifuge, also known as the drum. It generates centrifugal force through rotation, throwing the material onto the filter bag in the drum, and then the scraper scrapes the material off to achieve cleaning. Finally, the lifting shaft is used to lift the filter bag to shake it, thereby achieving the cleaning operation of the last layer of material on the filter bag.

[0003] Among them, the rotating shaft in the drum is composed of a rotating sleeve bearing seat, a main shaft, and a lifting shaft. When the lifting shaft is to be lifted and lowered in the drum, the high-speed rotating lifting shaft itself will vibrate, and the lifting shaft is thin and long, which can easily cause changes in the concentricity and clearance between the lifting shaft and the main shaft, resulting in unsmooth lifting and lowering of the lifting shaft, and then there is a risk of locking the outer wall of the lifting shaft and the inner wall of the main shaft, affecting the normal operation of the centrifuge. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a centrifuge main shaft assembly.

[0005] The utility model provides a centrifuge spindle assembly, comprising: a bearing seat, a spindle, and a lifting shaft. The bearing seat is installed on the spindle, and a first countersunk hole and a second countersunk hole are respectively opened at both ends of the spindle. A first shaft sleeve and a second shaft sleeve are respectively embedded in the first countersunk hole and the second countersunk hole. The lifting shaft passes through the center holes of the first shaft sleeve, the spindle and the second shaft sleeve in sequence and is coaxially arranged with the spindle. The lifting shaft is loosely matched with the inner wall of the lower end of the first center hole portion formed by the spindle, and is tightly matched with the inner wall of the second center hole portion formed by the first shaft sleeve. An oil-containing groove body is opened on the inner wall of the second center hole portion, and the lifting shaft is slidably matched with the inner wall of the third center hole portion formed by the second shaft sleeve.

[0006] As a further optimization of the above solution, the oil-containing groove body specifically includes a plurality of annular grooves vertically opened at equal intervals on the inner wall of the second central hole portion, and the cross-sections of the annular grooves all adopt a rectangular structure.

[0007] As a further optimization of the above solution, a rounded transition is adopted at the corner between the inner wall of the second center hole portion and the oil-containing tank body.

[0008] As a further optimization of the above solution, a retaining ring groove is provided on the inner wall of the countersunk hole above the sleeve, and a retaining ring member is installed in the retaining ring groove and is sleeved on the outer wall of the lifting shaft to form abutment against the upper end of the sleeve.

[0009] As a further optimization of the above solution, the countersunk hole includes a straight hole portion and a wide-mouth portion connecting the straight hole portion and the end face of the main shaft, the inner wall of the straight hole portion covers the outer wall of the sleeve and the two are fixedly connected.

[0010] As a further optimization of the above solution, an oil-containing groove is also opened on the inner wall of the second sleeve.

[0011] In the utility model, the proposed spindle assembly, by installing the first sleeve and the second sleeve in the first center hole portion of the spindle, the inner wall of the first sleeve and the outer wall of the lifting shaft form a tight fit connection, and the inner wall of the second sleeve and the outer wall of the lifting shaft form a sliding fit, so that the inner wall of the first center hole portion of the spindle and the outer wall of the lifting shaft form a loose fit connection, shortening the contact surface between the original inner wall of the spindle and the lifting shaft, reducing the friction between the lifting shaft and the spindle, and an oil-containing groove body is opened on the inner wall of the second center hole portion, through the self-lubricating property, the friction between the lifting shaft and the sleeve is further reduced, the overall contact mode between the lifting shaft and the spindle is changed, and the lifting shaft is connected to the head and tail through the first sleeve and the second sleeve. The vibration amplitude and frequency generated by the lifting shaft when working are reduced, the stability of the lifting shaft is improved, and the concentricity and clearance adaptation degree between the lifting shaft and the spindle during the up and down movement are improved, effectively avoiding the locking of the lifting shaft and damage due to friction, and improving the stability of the centrifugal operation of the centrifuge. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A structural schematic diagram of an implementation method of a centrifuge main shaft assembly proposed by the utility model;

[0013] Figure 2 A schematic diagram of a structure and use scenario of an implementation mode of a centrifuge main shaft assembly proposed by the utility model;

[0014] Figure 3 This is an enlarged schematic diagram of structure A of an implementation method of a centrifuge main shaft assembly proposed by the utility model. DETAILED DESCRIPTION

[0015] like Figure 1 As shown, Figure 1 The utility model is a schematic structural diagram of an implementation of a centrifuge main shaft assembly.

[0016] Reference Figure 1 and Figure 3The utility model proposes a centrifuge spindle assembly, including: a bearing seat 1, a spindle 2, and a lifting shaft 3. The bearing seat 1 is installed on the spindle 2. The first countersunk hole 4 and the second countersunk hole 5 are respectively opened at both ends of the spindle 2. The first countersunk hole 4 and the second countersunk hole 5 are respectively embedded with a first sleeve 6 and a second sleeve 7. The lifting shaft 3 passes through the center holes of the first sleeve 6, the spindle 2 and the second sleeve 7 in sequence and is coaxially arranged with the spindle 2. The lifting shaft 3 is loosely matched with the inner wall of the lower end of the first center hole portion 8 formed by the spindle 2, and the lifting shaft 3 is tightly matched with the inner wall of the second center hole portion 9 (not marked in the accompanying drawings) formed by the first sleeve 6. An oil-containing groove body 12 is opened on the inner wall of the second center hole portion 9, and the lifting shaft 3 is slidably matched with the inner wall of the third center hole portion 10 (not marked in the accompanying drawings) formed by the second sleeve 7.

[0017] refer to Figure 2 In the specific working process of the main shaft assembly of this embodiment, the device of the present application is installed at the center of the drum, the outer ring of the upper end of the main shaft 2 is fixedly sleeved on the tapered sleeve of the drum, the lower end of the main shaft 2 passes through the center hole of the bearing seat 1 and is connected to the driving device in the centrifuge. The main shaft 2 is driven to rotate by the driving device, and then the drum tapered sleeve is driven to rotate synchronously. At the same time, the upper end of the lifting shaft 3 is connected to the drum filter bag component, and the lower end of the lifting shaft 3 is connected to the cylinder pull rod drive inside the centrifuge.

[0018] After the spindle assembly of the present application is installed in the centrifuge drum, when the centrifugation operation of the material is completed, the drum, the spindle 2, the filter bag component, and the lifting shaft 3 will all rotate slowly. During this process, the cylinder pull rod inside the centrifuge drives the rotating lifting shaft 3 to rise or fall in the center hole of the spindle 2, thereby driving the drum filter bag component to shake off the material on the surface of the filter bag. The present application installs the first shaft sleeve 6 and the second shaft sleeve 7 in the first center hole portion 8 of the spindle 2, and the inner wall of the first shaft sleeve 6 and the outer wall of the lifting shaft 3 form a tight fit connection, and the inner wall of the second shaft sleeve 7 and the outer wall of the lifting shaft 3 form a sliding fit, so that the inner wall of the first center hole portion 8 of the spindle 2 and the outer wall of the lifting shaft 3 form a loose fit connection, shrinking The contact surface between the inner wall of the original main shaft 2 and the lifting shaft 3 is shortened to reduce the friction between the lifting shaft 3 and the main shaft 2, and an oil-containing groove body 12 is opened on the inner wall of the second center hole portion 9. Through the self-lubricating property, the friction between the lifting shaft 3 and the first sleeve 6 is further reduced, and the overall contact mode between the lifting shaft 3 and the main shaft 2 is changed. The lifting shaft 3 is connected head to tail through the first sleeve 6 and the second sleeve 7, which reduces the vibration amplitude and frequency generated by the lifting shaft 3 when working, improves the stability of the lifting shaft 3, and improves the concentricity and clearance adaptation between the lifting shaft 3 and the main shaft 2 during the up and down movement, effectively avoiding the locking of the lifting shaft 3 and damage due to friction, and improving the stability of the centrifugal operation of the centrifuge.

[0019] In this embodiment, the oil-containing groove body 12 specifically includes a plurality of annular grooves vertically and evenly spaced on the inner wall of the second center hole portion 9, and the cross-section of the annular grooves adopts a rectangular structure. By means of a plurality of vertically and evenly spaced annular grooves, the uniformity of oil output in the oil-containing groove body 12 is increased, and the comprehensiveness of the distribution of the lubricating oil on the inner wall of the second center hole portion 7 is improved.

[0020] Secondly, in order to reduce the friction damage to the outer wall of the lifting shaft 3, the corners between the inner wall of the second central hole 9 and the oil-containing groove body 12 are rounded to prevent the notch of the oil-containing groove body 12 from damaging the outer wall of the lifting shaft 3.

[0021] In this embodiment, a retaining ring groove is provided on the inner wall of the countersunk hole 4 above the first sleeve 6, and a retaining ring member 11 is installed in the retaining ring groove and is sleeved on the outer wall of the lifting shaft 3 to form abutment against the upper end of the first sleeve 6, so that the retaining ring member 11 can exert a force to press the first sleeve 6 into the countersunk hole 4, thereby improving the firmness of the first sleeve 6 installed in the countersunk hole 4 and avoiding the problem of the first sleeve 6 falling off from the countersunk hole 4.

[0022] Among them, the countersunk hole 4 includes a straight hole portion and a wide-mouth portion connecting the straight hole portion and the end face of the main shaft 2. The inner wall of the straight hole portion covers the outer wall of the first sleeve 6 and the two are fixedly connected to form a complete covering for the first sleeve 6, thereby improving the firmness of the first sleeve 6 installed in the countersunk hole 4, and by opening the wide-mouth portion, the convenience of assembling and installing the first sleeve 6 into the countersunk hole 4 is improved.

[0023] In this embodiment, an oil-containing groove 12 may also be provided on the inner wall of the second sleeve 7 , so that the inner wall of the second sleeve 7 and the outer wall of the lifting shaft 3 form a tight fit, further improving the stability of the lifting shaft 3 .

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A centrifuge spindle assembly, characterized in that: include: A bearing seat (1), a main shaft (2), and a lifting shaft (3); the main shaft (2) is provided with a bearing seat (1); two ends of the main shaft (2) are respectively provided with a first counterbore (4) and a second counterbore (5); a first shaft sleeve (6) and a second shaft sleeve (7) are respectively embedded in the first counterbore (4) and the second counterbore (5); the lifting shaft (3) passes through the center holes of the first shaft sleeve (6), the main shaft (2), and the second shaft sleeve (7) in sequence and is coaxially arranged with the main shaft (2); the lifting shaft (3) is loosely fitted with the inner wall of the first center hole portion (8) formed by the main shaft (2); the lifting shaft (3) is tightly fitted with the inner wall of the second center hole portion (9) formed by the first shaft sleeve (6); an oil-containing groove body (12) is provided on the inner wall of the second center hole portion (9); the lifting shaft (3) is slidably fitted with the inner wall of the third center hole portion (10) formed by the second shaft sleeve (7).

2. The spindle assembly according to claim 1, characterized in that: The oil-containing groove body (12) specifically comprises a plurality of annular grooves vertically arranged at equal intervals on the inner wall of the second central hole portion (9), and the cross-sections of the annular grooves all adopt a rectangular structure.

3. The spindle assembly according to claim 2, characterized in that: A rounded transition is adopted at the corner between the inner wall of the second central hole portion (9) and the oil-containing groove body (12).

4. The spindle assembly according to claim 1, characterized in that: The inner wall of the counterbore (4) is provided with a retaining ring groove above the first shaft sleeve (6), and a retaining ring member (11) is installed in the retaining ring groove and is sleeved on the outer wall of the lifting shaft (3) to form abutment against the upper end of the first shaft sleeve (6).

5. The spindle assembly according to claim 1, characterized in that: The counterbore (4) comprises a straight hole portion and a wide mouth portion connecting the straight hole portion and the end surface of the main shaft (2); the inner wall of the straight hole portion covers the outer wall of the first sleeve (6) and the two are fixedly connected.

6. The spindle assembly according to claim 1, characterized in that: An oil-containing groove (12) is also provided on the inner wall of the second shaft sleeve (7).

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