A spiral classifier

Abstract

The present invention provides a spiral classifier, comprising a platform support and a machine trough mounted on the platform support, wherein a driving device and a lifting device are respectively arranged at two ends of the machine trough, a discharge port is arranged at the bottom of the machine trough close to one end of the driving device, an overflow trough is arranged at one end of the machine trough close to the lifting device, a feed pipe is arranged at the top of the machine trough, a spiral is arranged in the machine trough, one end of the spiral extends out of the machine trough and is transmission-connected to the driving device, the other end of the spiral is rotationally connected to the lifting device, the lifting device comprises an underwater bearing, the underwater bearing comprises an open half-bearing bushing used in pairs and detachably connected, and the sum of the arc lengths of the two open half-bearing bushes is less than the corresponding circumferential length, the open half-bearing bushings are used in pairs, so that the material can flow through the underwater bearing smoothly without causing wear, thereby greatly improving the service life.

Description

Technical Field

[0001] The invention relates to the technical field of spiral classifiers, and in particular to a spiral classifier. Background Art

[0002] The spiral classifier is a mechanical classifying equipment for material classification. The spiral classifier mainly includes a spiral for stirring and pushing materials, a machine slot for accommodating materials and providing a channel for material transmission, a lifting device for lifting the connecting shaft at one end of the spiral, and an underwater bearing for connecting the spiral and allowing the spiral to swing at a small angle.

[0003] Spiral classifiers are widely used in the fields of mineral processing, chemical separation, etc., especially in the classification of hydrofluoric acid solutions. In the classification process of hydrofluoric acid solution, due to its strong abrasiveness and corrosiveness, the durability of the underwater parts of the spiral classifier is required to be high (such as underwater bearings).

[0004] The underwater bearings used in spiral classifiers are mostly integral structures, which are not easy to disassemble and maintain. In particular, the bushings used in the bearings are also integrated structures. This causes the materials (i.e., the various particles contained in the materials to be classified) to cause greater wear on the bearings during long-term use of the spiral classifier, which in turn leads to a faster replacement frequency of the bearings, which not only increases the use cost of the spiral classifier, but also affects the normal operation of the spiral classifier. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a spiral classifier to solve the problem that the underwater bearings are subject to heavy wear during use, and the bearings and internal bushings are of an integral structure and are not easy to disassemble and replace, resulting in the need for frequent replacement of the entire bearing.

[0006] In order to solve the above technical problems, the present invention specifically adopts the following technical solutions:

[0007] A spiral classifier comprises a platform support and a machine trough erected on the platform support, a driving device and a lifting device are respectively arranged at both ends of the machine trough, a discharge port is arranged at the bottom of the machine trough close to one end of the driving device, an overflow trough is arranged at one end of the machine trough close to the lifting device, a feed pipe is arranged at the top of the machine trough, a spiral is arranged in the machine trough, one end of the spiral extends out of the machine trough and is transmission-connected to the driving device, the other end of the spiral is rotationally connected to the lifting device, the lifting device comprises an underwater bearing, the underwater bearing comprises an open half-bearing shell used in pairs and detachably connected, and the sum of the arc lengths of the two open half-bearing shells is less than the corresponding circumferential length.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] By arranging open half-bearings that are used in pairs and can be detachably connected in the underwater bearing, the underwater bearing is no longer an integrated structure, and the detachably connected open half-bearings themselves further make the disassembly and maintenance of the underwater bearing relatively simple; in addition, since the sum of the arc lengths of the two open half-bearings is less than the corresponding circumferential length, that is, when the two open half-bearings are used together, a gap is left between the two, which allows the flowing materials in the water (that is, the water in the machine tank) to pass smoothly when passing through the interior of the underwater bearing, especially when passing between the two open half-bearings, and is not prone to excessive friction with the underwater bearing, which can effectively improve the service life of the underwater bearing and avoid frequent replacement of the underwater bearing.

[0010] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a spiral classifier in a preferred embodiment of the present invention;

[0012] Figure 2 It is a structural schematic diagram of a lifting device in a preferred embodiment of the present invention;

[0013] Figure 3 It is a schematic diagram of the structure of an underwater bearing in a preferred embodiment of the present invention.

[0014] The reference numerals are as follows:

[0015] 10. Platform support; 20. Machine slot; 30. Screw; 40. Lifting device; 41. Bearing with seat; 42. Swing nut; 43. Handwheel; 44. Lifting screw assembly; 45. Fork hanger; 46. Bolt and nut connector; 47. Connecting plate; 48. Underwater bearing; 481. Polytetrafluoroethylene gasket; 482. Polytetrafluoroethylene spacer; 483. Open half bearing; 484. Bearing base; 485. Positioning shaft; 486. Pin; 487. Bearing upper pressure cover; 488. Bearing positioning stud; 489. Side plate; 49. Lifting support; 50. Swinging drive device frame; 60. Drive device; 70. Discharge port; 80. Overflow chute; 90. Slag discharge pipe; 100. Tail shaft; 110. Feed pipe. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] like Figure 1-Figure 3 As shown, the present invention provides a technical solution: a spiral classifier, comprising a platform support 10 and a machine slot 20 mounted on the platform support 10, a driving device 60 and a lifting device 40 are respectively arranged at both ends of the machine slot 20, in order to discharge the coarse and heavy particles sunk to the bottom of the machine slot 20, a discharge port 70 is arranged at the bottom of the machine slot 20 close to one end of the driving device 60, and an overflow slot 80 is arranged at one end of the machine slot 20 close to the lifting device 40, so that light and fine particles suspended on the water surface can overflow and be discharged from the spiral classifier through the overflow slot 80, a feed pipe 110 is arranged at the top of the machine slot 20, a spiral 30 is arranged in the machine slot 20, one end of the spiral 30 extends out of the machine slot 20 and is transmission-connected to the driving device 60, and the other end of the spiral 30 is rotationally connected to the lifting device 40, and the lifting device 40 includes an underwater bearing 48, and the underwater bearing 48 includes an open semi-bearing 483 used in pairs and detachably connected, and the sum of the arc lengths of the two open semi-bearings 483 is less than the corresponding circumferential length. When the above scheme is used, the material (such as hydrofluoric acid solution) that needs to be classified can be put into the machine tank 20 by the feed pipe 110, and the heavier particles in the material will sink into the bottom of the machine tank 20 and form return sand, while the lighter and finer particles will be suspended on the water surface and form overflow. As the driving device 60 drives the spiral 30 to rotate, the return sand that sinks into the bottom of the machine tank 20 will be discharged through the discharge port 70 under the promotion of the spiral 30, and the lighter and finer particles will enter the overflow tank 80 under the effect of the overflow and be discharged. Although the hydrofluoric acid solution has strong corrosiveness and abrasiveness, because the underwater bearing 48 includes an open half-bearing bush 483, and the sum of the arc lengths of the two open half-bearing bushes 483 is less than the corresponding circumferential length, the particles in the hydrofluoric acid solution can pass smoothly between the two open half-bearing bushes 483, greatly reducing the friction with the open half-bearing bush 483, and then improving the service life of the underwater bearing 48, effectively avoiding the frequent replacement of the underwater bearing 48.

[0018] In a preferred embodiment of the present invention, Figure 2 , Figure 3As shown, the underwater bearing 48 also includes a bearing base 484 and a bearing cover 487 arranged opposite to the bearing base 484. The two open half-bearings 483 are respectively arranged on the opposite side of the bearing cover 487 and the bearing base 484. In this way, a basic connection structure can be formed by the bearing base 484 and the bearing cover 487, which is convenient for connection with one end of the spiral 30. Side plates 489 are arranged on both sides of the bearing base 484. A positioning shaft 485 is fixedly connected to the side plate 489. In this way, it can be ensured that the open half-bearing 483 will not have axial movement during operation. At the same time, the open half-bearing 483 is firmly pressed on the bearing base 484 by the side plate 489 and the bearing cover 487, which further avoids radial movement of the open half-bearing 483. The positioning shaft 485 is rotatably connected to the bottom of the lifting device 40. It should be pointed out that, since the spiral classifier swings at a small angle during use, after the two open half-bearings 483 fit and press one end of the spiral 30, the spiral 30 will not move in the axial direction, thereby not affecting the normal operation of the spiral 30.

[0019] In order to better extend the service life of the spiral 30, in a preferred embodiment of the present invention, as Figure 2 , Figure 3 As shown, the end of the spiral 30 close to the lifting device 40 is detachably connected to the tail shaft 100 (preferably, the tail shaft 100 and the spiral 30 can be connected by a flange), and the end of the tail shaft 100 away from the spiral 30 extends between the two open half-bearings 483 and is limited by the two open half-bearings 483. It should be pointed out that in order to further improve the durability of the tail shaft 100, a sealing member (such as a polytetrafluoroethylene sleeve with strong corrosion resistance) can also be sleeved on the outside of the tail shaft 100 to prevent the material from causing more corrosion and wear to it.

[0020] In a preferred embodiment of the present invention, Figure 3 As shown, bearing positioning studs 488 are arranged in pairs on the bearing upper pressure cover 487, and one end of the bearing positioning stud 488 passes through the bearing upper pressure cover 487 and the two open half bearings 483 in sequence and is threadedly connected to the bearing base 484, so as to facilitate the basic function of the underwater bearing 48 and also facilitate better disassembly and maintenance of the underwater bearing 48 in this detachable manner.

[0021] In a preferred embodiment of the present invention, Figure 2 , Figure 3As shown, a polytetrafluoroethylene spacer 482 is fixedly arranged on the positioning shaft 485, and the polytetrafluoroethylene spacer 482 is rotatably connected to one end of the lifting device 40, so that the lifting device 40 can avoid direct contact with the positioning shaft 485, reduce the rotational friction between the two, and make the lifting device 40 more flexible during the lifting process. A pin 486 is also arranged at one end of the positioning shaft 485 away from the open half bearing 483, so that the polytetrafluoroethylene spacer 482 can be limited by inserting the pin 486 into the positioning shaft 485 along the radial direction of the positioning shaft 485.

[0022] In order to further reduce the rotational friction, in a preferred embodiment of the present invention, Figure 3 As shown, a polytetrafluoroethylene gasket 481 is fixedly disposed on the positioning shaft 485 , and the polytetrafluoroethylene gasket 481 is located on a side of the polytetrafluoroethylene spacer 482 away from the side plate 489 .

[0023] In a preferred embodiment of the present invention, Figure 2 As shown, the lifting device 40 includes a lifting bracket 49, a seat bearing 41 is arranged on the top of the lifting bracket 49, a hand wheel 43 that can rotate along the inner ring of the seat bearing 41 is arranged in the seat bearing 41, one end of the hand wheel 43 extends out of the bottom of the seat bearing 41 and is drivingly connected to a lifting screw assembly 44, a fork-type hanger 45 is arranged at one end of the lifting screw assembly 44 away from the hand wheel 43, and a connecting plate 47 for detachably connecting an underwater bearing 48 is arranged at one end of the fork-type hanger 45 away from the lifting screw assembly 44, so as to facilitate connection with the underwater bearing 48 through the connecting plate 47. Specifically, a bolt and nut connector 46 can be arranged at the joint between the fork-type hanger 45 and the connecting plate 47, so as to realize the connection between the lifting device 40 and the underwater bearing 48, and facilitate the quick disassembly and maintenance of the fork-type hanger 45 through the connecting plate 47.

[0024] In a preferred embodiment of the present invention, Figure 2 , Figure 3 As shown, a swing nut 42 is provided on the seat bearing 41, so that the seat bearing 41 and the underwater bearing 48 can form a connecting rod mechanism, which makes it convenient for the open half-bearing 483 to adaptively adjust and adapt to the inclination angle of the spiral 30, so that the inner surface of the open half-bearing 483 is more closely fitted with the outer surface of one end of the spiral 30.

[0025] In a preferred embodiment of the present invention, Figure 1 As shown, the end of the machine trough 20 close to the driving device 60 is tilted upward, and a slag discharge pipe 90 is provided at the lower part of the end of the machine trough 20 away from the driving device 60, so that the machine trough 20 can be easily cleaned and flushed by pouring special cleaning liquid into the machine trough 20.

[0026] In a preferred embodiment of the present invention, Figure 1 As shown, a swinging drive device frame 50 for placing and fixing a drive device 60 is provided at one end of the platform bracket 10 which is tilted upward. Both the drive device 60 and the swinging drive device frame 50 are prior arts and can be understood by referring to the working principle of a general mineral processing spiral classifier.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A spiral classifier, characterized in that: The invention comprises a platform support (10) and a machine trough (20) mounted on the platform support (10), wherein a driving device (60) and a lifting device (40) are respectively arranged at two ends of the machine trough (20), a discharge port (70) is arranged at the bottom of the machine trough (20) close to one end of the driving device (60), an overflow trough (80) is arranged at one end of the machine trough (20) close to the lifting device (40), a feed pipe (110) is arranged at the top of the machine trough (20), a spiral (30) is arranged in the machine trough (20), one end of the spiral (30) extends out of the machine trough (20) and is transmission-connected to the driving device (60), the other end of the spiral (30) is rotationally connected to the lifting device (40), and the lifting device (40) comprises an underwater bearing (48), and the underwater bearing (48) comprises an open half-bearing (483) used in pairs and detachably connected, and the two half-bearings (483) are connected to each other in a manner similar to that of the lifting device (40). The sum of the arc lengths of the open half-bearings (483) is smaller than the corresponding circumferential length; the underwater bearing (48) further comprises a bearing base (484) and a bearing upper pressure cover (487) arranged opposite to the bearing base (484); the two open half-bearings (483) are respectively arranged on the opposite sides of the bearing upper pressure cover (487) and the bearing base (484); side plates (489) are arranged on both sides of the bearing base (484); a positioning shaft (485) is fixedly connected to the side plate (489); the positioning shaft (485) is rotatably connected to the bottom of the lifting device (40); bearing positioning studs (488) are arranged in pairs on the bearing upper pressure cover (487); one end of the bearing positioning studs (488) passes through the bearing upper pressure cover (487) and the two open half-bearings (483) in sequence and is threadedly connected to the bearing base (484).

2. A spiral classifier according to claim 1, characterized in that: A polytetrafluoroethylene spacer (482) is fixedly arranged on the positioning shaft (485), and the polytetrafluoroethylene spacer (482) is rotatably connected to one end of the lifting device (40).

3. A spiral classifier according to claim 2, characterized in that: A polytetrafluoroethylene gasket (481) is fixedly arranged on the positioning shaft (485), and the polytetrafluoroethylene gasket (481) is located on a side of the polytetrafluoroethylene spacer (482) away from the side plate (489).

4. A spiral classifier according to claim 1, characterized in that: The lifting device (40) comprises a lifting bracket (49), a seat bearing (41) is arranged on the top of the lifting bracket (49), a hand wheel (43) which can rotate along the inner ring of the seat bearing (41) is arranged inside the seat bearing (41), one end of the hand wheel (43) extends out of the bottom of the seat bearing (41) and is connected to a lifting screw assembly (44) in a transmission manner, a fork-type hanger (45) is arranged at one end of the lifting screw assembly (44) away from the hand wheel (43), and a connecting plate (47) for detachably connecting the underwater bearing (48) is arranged at one end of the fork-type hanger (45) away from the lifting screw assembly (44).

5. A spiral classifier according to claim 4, characterized in that: The seat bearing (41) is provided with a swing nut (42).

6. A spiral classifier according to claim 1, characterized in that: One end of the machine trough (20) close to the driving device (60) is arranged to be inclined upward, and a slag discharge pipe (90) is provided at the lower part of one end of the machine trough (20) away from the driving device (60).

7. A spiral classifier according to claim 6, characterized in that: A swing-type driving device frame (50) for placing and fixing a driving device (60) is provided at one end of the platform support (10) that is tilted upward.

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