Bushing mounting structure for feeding hole of ball mill

Abstract

The utility model discloses a ball mill feed inlet bushing mounting structure which comprises an end cover and an inner bushing, a feed inlet is formed in the center of the end cover, an outer sleeve is arranged at the feed inlet in a manner of integrally extending towards the outer side, the inner bushing is nested in the outer sleeve, and a negative pressure cavity is formed between the inner bushing and the outer sleeve. The outer wall of one side of the outer sleeve is connected with an inner pressure control piece communicated with the negative pressure cavity, the inner pressure control piece can monitor and actively control the inner pressure of the negative pressure cavity, and a plurality of groups of pressing devices distributed in a circumferential array mode are arranged at the outer end of the outer sleeve. Sealing is reliable, the negative pressure sealing state can be monitored in real time, and negative pressure is supplemented in time.

Description

Technical Field

[0001] The utility model relates to the technical field of ball mills, in particular to a ball mill feed port bushing installation structure. Background Art

[0002] The semi-autogenous grinding process used in slag processing plants in the metallurgical industry is a comprehensive process that combines SAG mills with traditional crushing technologies. It is primarily used to process solid wastes such as smelting slag and tailings, enabling the recovery of valuable metals and the resource utilization of waste slag. During ball mill operation, the seal between the hollow shaft bushing and the end cap is a critical step in preventing slurry leakage, lubricant contamination, and dust spillage. The performance of this seal directly impacts equipment life and production efficiency.

[0003] Conventional ball mill bushings, such as those described in a Chinese patent (CN201755504U, A Sealing Device for a Ball Mill Bushing and End Cover), use flange bolts to secure the bushing and end cover. A grease nipple is placed in the gap between the bushing and end cover to prevent slurry from seeping into the cavity between them. This protects the inlet and outlet covers from wear caused by infiltrating slurry, thereby increasing their service life. While flange bolts secure the bushing and end cover, bolts, as the primary load-bearing structure, are susceptible to rust and adhesion when exposed to humid, salty environments over a long period of time, making bushing removal difficult during maintenance. Furthermore, grease caulking seals the gaps, but under prolonged pressure, the grease base oil separates, leaving residual thickener forming hard lumps (Shore hardness > 90), compromising sealing performance.

[0004] Based on this, the utility model designs a ball mill feed inlet bushing installation structure to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a ball mill feed inlet bushing installation structure to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a ball mill feed inlet bushing installation structure, comprising an end cover and an inner bushing, wherein the center of the end cover is a feed inlet, an outer sleeve is integrally extended from the end cover at the feed inlet, and the inner sleeve is nested in the outer sleeve;

[0007] A negative pressure cavity is provided between the inner sleeve and the outer sleeve. An outer wall of one side of the outer sleeve is connected to an internal pressure control component which is in communication with the negative pressure cavity. The internal pressure control component can monitor and actively control the internal pressure of the negative pressure cavity.

[0008] Preferably, the inner sleeve is a conical cylinder structure, the opening diameter of the feed end of the conical cylinder structure is smaller than the opening diameter of the discharge end, the feed end of the outer wall of the inner sleeve is provided with an outer annular ridge, and the discharge end of the outer wall of the inner sleeve is provided with an inner annular ridge, the side end face of the outer annular ridge abuts against the outer end edge of the outer sleeve, and the outer circumference of the inner annular ridge abuts against the inner circumference of the outer sleeve.

[0009] Preferably, a first sealing ring is provided between the outer annular ridge and the outer sleeve, and a second sealing ring is provided between the inner annular ridge and the outer sleeve.

[0010] Preferably, the internal pressure control component includes a four-way joint, one of the interfaces of the four-way joint is connected to the negative pressure chamber, and the other three interfaces are respectively connected to the pressure suction nozzle, the internal pressure monitoring device and the pressure relief valve, and a one-way valve is connected in series between the pressure suction nozzle and the four-way joint interface.

[0011] Preferably, the internal pressure monitoring device is a wireless pressure sensor, and the wireless pressure sensor is remotely wirelessly connected to the ball mill control system via NB-IoT, LoRa or 4G.

[0012] Preferably, the outer end of the outer sleeve is provided with several groups of clamping devices distributed in a circumferential array, and the clamping device includes a U-shaped rocker arm, one end of the U-shaped rocker arm is fixedly provided on the outer wall of the outer sleeve, the middle of the U-shaped rocker arm is connected by a rotary joint, and the other end of the U-shaped rocker arm is threaded with a clamping screw, and the clamping screw is perpendicular to the movable end of the U-shaped rocker arm, and abuts against the outer annular convex edge after being tightened.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The ball mill feed inlet bushing installation structure of the utility model adopts negative pressure fastening and sealing technology. A negative pressure chamber is designed between the inner bushing and the outer sleeve. The negative pressure chamber is evacuated to a negative pressure state, and the inner bushing and the outer sleeve are firmly sucked together. Compared with the existing bolt locking and grease filling sealing structure, the utility model is easy to install and can avoid the loading and unloading troubles caused by bolt rust and adhesion; the sealing is reliable, and the negative pressure sealing state can be monitored in real time and the negative pressure can be replenished in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure of the ball mill feed port of the utility model;

[0017] Figure 2 This is a schematic diagram of the inner liner and the internal pressure control component in the installed state of the utility model;

[0018] Figure 3 This is a schematic diagram of the inner liner and internal pressure control component in the disassembled state of the utility model. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the utility model embodiments in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the utility model embodiments, not all of the embodiments. Based on the utility model embodiments, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of utility model protection.

[0020] Example 1

[0021] See also Figure 1-3 , the utility model provides a technical solution:

[0022] A ball mill feed port bushing installation structure includes an end cover 10 and an inner bushing 20. The center of the end cover 10 is a feed port 11. At the feed port 11, an outer sleeve 12 is integrally extended from the end cover, and the inner bushing 20 is nested in the outer sleeve 12.

[0023] The inner sleeve 20 is a conical cylinder structure, and the opening diameter of the feed end of the conical cylinder structure is smaller than the opening diameter of the discharge end. The outer wall of the inner sleeve 20 is provided with an outer annular ridge 21 at the feed end, and the outer wall of the inner sleeve 20 is provided with an inner annular ridge 22 at the discharge end. The side end face of the outer annular ridge 21 abuts against the outer end edge of the outer sleeve 12, and the outer circumference of the inner annular ridge 22 abuts against the inner circumference of the outer sleeve 12. A first sealing ring 51 is provided between the outer annular ridge 21 and the outer sleeve 12, and a second sealing ring 52 is provided between the inner annular ridge 22 and the outer sleeve 12.

[0024] There is a negative pressure cavity 30 between the inner sleeve 20 and the outer sleeve 12, that is, a cavity formed by the outer annular ridge 21, the inner sleeve 20 and the outer sleeve 12; the negative pressure cavity 30 is formed after the inner sleeve 20 and the outer sleeve 12 are nested and installed. By controlling the internal pressure of the negative pressure cavity 30 to form a negative pressure state, the inner sleeve 20 and the outer sleeve 12 can be prevented from loosening and disengaging, thereby realizing the suction installation of the inner sleeve 20 and the outer sleeve 12.

[0025] An inner pressure control member 40 is connected to the outer wall of one side of the outer sleeve 12 and is in communication with the negative pressure chamber 30. The inner pressure control member 40 can monitor and actively control the inner pressure of the negative pressure chamber 30.

[0026] Specifically, the internal pressure control component 40 includes a four-way connector 41, one of which is connected to the negative pressure chamber 30, and the other three are connected to a pressure extraction nozzle 42, an internal pressure monitoring device 43, and a pressure relief valve 44 respectively.

[0027] The suction nozzle 42 is connected to an external negative pressure device, which can extract the air in the negative pressure chamber 30, thereby forming a negative pressure state; a one-way valve 45 is connected in series between the suction nozzle 42 and the interface of the four-way connector 41 to ensure that the suction nozzle 42 can only pump air into the negative pressure chamber 30 to increase the negative pressure and enhance the suction force of the negative pressure chamber 30.

[0028] The pressure relief valve 44 can be opened manually or automatically activated when a certain negative pressure value is exceeded. It is used to discharge air to eliminate the negative pressure suction force when the inner sleeve 20 is removed, and to automatically ventilate and reduce the negative pressure as a pressure safety valve when the negative pressure exceeds the standard.

[0029] The internal pressure monitoring device 43 is a wireless pressure sensor, which is remotely connected to the ball mill control system via NB-IoT, LoRa or 4G, making it convenient to monitor the pressure of the negative pressure chamber 30 through a remote monitoring system. Once the pressure is lower than the standard value, the negative pressure is supplemented.

[0030] Example 2

[0031] Since the inner sleeve 20 and the outer sleeve 12 are installed by negative pressure suction, although the internal pressure of the negative pressure chamber 30 can be monitored in real time and the negative pressure can be replenished in time, once the seal of the negative pressure chamber 30 fails accidentally, the inner sleeve 20 will be separated from the outer sleeve 12, posing a safety hazard to the equipment.

[0032] To this end, based on Example 1, this embodiment is provided with several groups of circumferentially distributed clamping devices 60 at the outer end of the outer sleeve 12, and the clamping device 60 includes a U-shaped rocker arm 61, one end of the U-shaped rocker arm 61 is fixedly provided on the outer wall of the outer sleeve 12, the middle of the U-shaped rocker arm 61 is connected by a rotary joint 62, and the other end of the U-shaped rocker arm 61 is screwed with a clamping screw 63, and the clamping screw 63 is perpendicular to the movable end of the U-shaped rocker arm 61. When the U-shaped rocker arm 61 is in a "U-shaped" state, the clamping screw 63 is tightened and abuts against the outer annular ridge 21.

[0033] When the inner sleeve 20 and the outer sleeve 12 are disassembled, the pressing screw 63 can be loosened to rotate the movable end of the U-shaped rocker 61 180 degrees to Figure 3 After the inner sleeve 20 and the outer sleeve 12 are installed by suction, the movable end of the U-shaped rocker 61 is swung to Figure 2 state and lock the compression screw 63. Even if the seal of the negative pressure chamber 30 fails accidentally, the compression device 60 can still serve as a temporary fastener to prevent the inner sleeve 20 from being separated from the outer sleeve 12 before the maintenance personnel perform maintenance, thereby eliminating the safety hazard of the equipment.

[0034] Although embodiments of the utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A ball mill feed inlet bushing installation structure, comprising an end cover (10) and an inner bushing (20), wherein the center of the end cover (10) is a feed inlet (11), an outer sleeve (12) is integrally extended from the end cover at the feed inlet (11), and the inner bushing (20) is nested in the outer sleeve (12); characterized in that: A negative pressure chamber (30) is provided between the inner sleeve (20) and the outer sleeve (12), and an inner pressure control component (40) communicating with the negative pressure chamber (30) is connected to an outer wall of one side of the outer sleeve (12). The inner pressure control component (40) is capable of monitoring and actively controlling the inner pressure of the negative pressure chamber (30).

2. The ball mill feed inlet bushing installation structure according to claim 1, characterized in that: The inner sleeve (20) is a conical cylinder structure, the opening diameter of the feed end of the conical cylinder structure is smaller than the opening diameter of the discharge end, the outer wall of the inner sleeve (20) is provided with an outer annular ridge (21) at the feed end, and the outer wall of the inner sleeve (20) is provided with an inner annular ridge (22) at the discharge end, the side end face of the outer annular ridge (21) abuts against the outer end edge of the outer sleeve (12), and the outer circumference of the inner annular ridge (22) abuts against the inner circumference of the outer sleeve (12).

3. The ball mill feed inlet bushing installation structure according to claim 2, characterized in that: A first sealing ring (51) is provided between the outer annular ridge (21) and the outer sleeve (12), and a second sealing ring (52) is provided between the inner annular ridge (22) and the outer sleeve (12).

4. The ball mill feed inlet bushing installation structure according to claim 1, characterized in that: The internal pressure control component (40) comprises a four-way connector (41), one interface of the four-way connector (41) being connected to the negative pressure chamber (30), and the remaining three interfaces being connected to a pressure extraction nozzle (42), an internal pressure monitoring device (43), and a pressure relief valve (44), respectively; a one-way valve (45) is connected in series between the pressure extraction nozzle (42) and the interface of the four-way connector (41).

5. The ball mill feed inlet bushing installation structure according to claim 4, characterized in that: The internal pressure monitoring device (43) is a wireless pressure sensor, and the wireless pressure sensor is remotely wirelessly connected to the ball mill control system via NB-IoT, LoRa or 4G.

6. The ball mill feed inlet bushing installation structure according to claim 2, characterized in that: The outer end of the outer sleeve (12) is provided with a plurality of groups of circumferentially arrayed pressing devices (60), the pressing devices (60) comprising a U-shaped rocker (61), one end of the U-shaped rocker (61) being fixedly provided on the outer wall of the outer sleeve (12), the middle of the U-shaped rocker (61) being connected via a rotary joint (62), the other end of the U-shaped rocker (61) being screwed with a pressing screw (63), the pressing screw (63) being perpendicular to the movable end of the U-shaped rocker (61), and being in contact with the outer annular ridge (21) after being tightened.

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