An automatically replaceable flash vaporizer feed tube orifice reducer

Abstract

The application discloses an automatic-replaceable flash evaporator feed pipe orifice plate reducing device, which comprises a flash evaporator support frame, a guide rail arranged on the flash evaporator support frame, an orifice plate reducing mechanism slidingly connected to the guide rail, a reducing drive assembly for driving the orifice plate reducing mechanism to reduce, and a replacement drive assembly for driving the orifice plate reducing mechanism to slide along the guide rail. The feed pipe orifice plate reducing device realizes automatic and accurate online adjustment of the orifice plate caliber during the pressure reduction of ore pulp. The device can stably and reliably operate under high-temperature and high-pressure conditions through the combination of structural optimization and automatic control, and continuously adjusts the caliber without shutdown, thereby greatly improving the operation efficiency and safety. The reducing mechanism ensures that the flow caliber formed is always circular or approximately circular, thereby guaranteeing the uniformity and stability of the ore pulp flow.

Description

Technical Field

[0001] This invention relates to an automatically replaceable flash evaporator feed pipe orifice plate diameter changing device, belonging to the field of alumina flash evaporation technology. Background Technology

[0002] Currently, in alumina production, the depressurization of the slurry through orifice plates in the flash evaporator is a crucial process. Traditionally, this relies on manually changing orifice plates of different diameters to adjust the flow area, a cumbersome and inefficient process. This not only requires frequent shutdowns for disassembly and installation, affecting production continuity, but also presents challenges such as high-temperature, high-pressure working environments, high risks to personnel, and difficulty in guaranteeing replacement accuracy. Furthermore, manual replacement is prone to clogging due to slurry residue or scaling, and the limited diameter adjustment range prevents continuous and precise online control, hindering the improvement of production automation and the stable optimization of process parameters. Summary of the Invention

[0003] The purpose of this invention is to provide an automatically replaceable flash evaporator feed pipe orifice plate diameter changing device.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] The present invention provides an automatically replaceable flash evaporator feed pipe orifice plate diameter changing device, comprising a flash evaporator support frame, a guide rail disposed on the flash evaporator support frame, an orifice plate diameter changing mechanism slidably connected to the guide rail, a diameter changing drive assembly for driving the orifice plate diameter changing mechanism to change diameter, and a replacement drive assembly for driving the fixed support ring to slide along the guide rail.

[0006] The orifice plate diameter changing mechanism includes a fixed support ring slidably connected to the guide rail, a fixed diameter changing ring fixed to the upper ring plate of the fixed support ring, a rotating diameter changing ring rotatably connected to the upper ring plate of the fixed diameter changing ring, and a set of movable stops installed between the fixed diameter changing ring and the rotating diameter changing ring.

[0007] The rotating reducing ring has a set of circumferentially distributed, elongated straight holes extending along the diameter direction on its ring plate. The fixed reducing ring has a set of circumferentially distributed, obliquely distributed holes extending along the inclined diameter direction on its ring plate. Each circumferentially distributed straight hole of the rotating reducing ring corresponds to each circumferentially distributed obliquely distributed hole of the fixed reducing ring. The fixed reducing ring and the rotating reducing ring are rotatably connected by rotating pins inserted into each of the straight holes of the rotating reducing ring and the corresponding obliquely distributed holes of the fixed reducing ring. Each rotating pin is fitted with a movable stop block, and the front ends of all movable stop blocks block the inner hole of the rotating reducing ring.

[0008] During flash evaporation, the fixed support ring is driven to slide along the guide rail by the replacement drive assembly, so that the inner holes of the fixed support ring, the fixed variable diameter ring and the rotating variable diameter ring are coaxially connected with the outlet of the feed pipe; when replacing the orifice plate, the fixed support ring is driven to slide along the guide rail to the replacement station by the replacement drive assembly.

[0009] Furthermore, a slider is fixed to the lower end of the outer ring of the fixed support ring, and the fixed support ring is slidably connected to the guide rail through the slider.

[0010] Furthermore, the front end of the movable stop is a triangular protrusion, so that the flow port formed by the various movable stops approaches a circle during the expansion and contraction process.

[0011] Furthermore, the replacement drive assembly includes a rotary motor fixed on the flash evaporator support frame, a lead screw guide sleeve fixed at the lower end of the fixed support ring, and a lead screw connected between the output shaft of the rotary motor and the lead screw guide sleeve; the rotary motor drives the fixed support ring to move along the guide rail by rotating the lead screw, so that the rotary variable diameter ring is engaged with or disengaged from the outlet end of the feed pipe.

[0012] Furthermore, the variable diameter drive assembly includes an electric push rod and a push-pull rod with both ends hinged to the rotating variable diameter ring and the output rod of the electric push rod, respectively. The electric push rod controls the rotating variable diameter ring to rotate relative to the fixed variable diameter ring through the push-pull rod.

[0013] Furthermore, the variable diameter drive assembly includes an electric push rod fixed on the flash evaporator support frame, a push-pull rod connected between the output rod of the electric push rod and the outer ring of the rotating variable diameter ring, and a latch rotatably connected to the outer ring of the rotating variable diameter ring via a vertical shaft;

[0014] The lower end of the latch is a vertical shaft connection part, and the upper end of the latch is a latch body with a horizontal push-pull rod connection hole. Two spaced baffles are arranged on the outer side of the right end of the latch body at the push-pull rod connection hole. Locking plate slots are provided on the inner side of the two baffles and the end of the latch body.

[0015] The left end of the push-pull rod is fitted with a hinge joint, which is hinged to the output rod of the electric push rod via a vertical shaft; the right end of the push-pull rod is vertically fixed with a locking piece, and the right end of the push-pull rod is slidably inserted into the push-pull rod connection hole of the latch body.

[0016] When the replacement drive assembly drives the fixed support ring to slide along the guide rail to the flash evaporation station, the latch slides along the push-pull rod until the locking piece and the locking groove are axially aligned. By rotating the push-pull rod, the locking piece is inserted into the locking groove, thereby locking the latch body of the latch with the push-pull rod. The electric push rod controls the rotation of the rotating variable diameter ring relative to the fixed variable diameter ring through the push-pull rod. When replacing the perforated plate, by rotating the push-pull rod, the rectangular locking piece is misaligned with the locking groove, thereby unlocking the latch body of the latch from the push-pull rod. The replacement drive assembly then drives the fixed support ring to slide along the guide rail to the replacement station.

[0017] A distance sensor is provided at the front end of the output rod of the electric actuator to detect the extension length of the output rod. Since the extension length of the output rod is directly proportional to the change in the occlusion area of ​​the inner hole of the rotating diameter ring, the extension length control of the output rod can be used to control the occlusion area of ​​the inner hole of the rotating diameter ring.

[0018] A lever is fixed to the side wall of the push-pull rod for rotating the push-pull rod.

[0019] The flash evaporator support frame is provided with a retaining ring corresponding to the position of the lever. When the locking body of the latch is locked to the push-pull rod, the retaining ring limits the rotation direction of the lever.

[0020] Beneficial effects

[0021] The feed pipe orifice plate diameter changing device of this invention realizes automated and precise online adjustment of the orifice plate diameter during slurry depressurization. Through a combination of structural optimization and automatic control, this device can operate stably and reliably under high temperature and high pressure conditions, completing continuous diameter adjustment without shutdown, significantly improving operational efficiency and safety. Its diameter changing mechanism ensures that the resulting flow diameter always remains circular or nearly circular, thereby guaranteeing the uniformity and stability of slurry flow. This invention not only adapts to harsh industrial environments but also enables efficient replacement and maintenance of the orifice plate, providing reliable technical support for intelligent control and safe production in alumina production. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the orifice plate diameter changing device of the present invention;

[0023] Figure 2 This is a schematic diagram of the orifice plate diameter changing mechanism in the orifice plate diameter changing device of the present invention;

[0024] Figure 3 This is a schematic diagram of the rotating diameter changing ring in the orifice plate diameter changing device of the present invention.

[0025] Figure 4 This is a schematic diagram of the rotating diameter changing ring in the orifice plate diameter changing device of the present invention.

[0026] Figure 5 This is an enlarged view of the left end structure of the diameter-changing drive assembly in the orifice plate diameter-changing device of the present invention;

[0027] Figure 6 This is an enlarged view of the right end structure of the diameter-changing drive assembly in the orifice plate diameter-changing device of the present invention;

[0028] In the diagram, 1-feed pipe, 2-orifice plate diameter changing mechanism, 21-fixed support ring, 22-fixed diameter changing ring, 23-movable stop block, 24-rotating diameter changing ring, 25-rotating pin, 3-diameter changing drive assembly, 31-electric push rod, 32-push-pull rod, 33-distance sensor, 34-hinged joint, 35-lock, 351-vertical shaft connection, 352-lock body, 353-baffle plate, 36-locking plate, 37-lever, 38-retaining ring, 4-replacement drive assembly, 41-rotating motor, 42-lead screw guide sleeve, 43-lead screw, 5-guide rail, 6-flash evaporator support frame, 7-slider. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Example

[0031] like Figure 1 As shown, the present invention provides an automatically replaceable flash evaporator feed pipe orifice plate diameter changing device, including a flash evaporator support frame 6, a guide rail 5 disposed on the flash evaporator support frame 6, an orifice plate diameter changing mechanism 2 slidably connected to the guide rail 5, a diameter changing drive assembly 3 for driving the orifice plate diameter changing mechanism 2 to change its diameter, and a replacement drive assembly 4 for driving the orifice plate diameter changing mechanism 2 to slide along the guide rail 5.

[0032] like Figure 2 As shown, the orifice plate diameter changing mechanism 2 includes a fixed support ring 21 slidably connected to the guide rail 5, a fixed diameter changing ring 22 fixed to the upper ring plate of the fixed support ring 21, a rotating diameter changing ring 24 rotatably connected to the upper ring plate of the fixed diameter changing ring 22, and a set of movable blocks 23 installed between the fixed diameter changing ring 22 and the rotating diameter changing ring 24.

[0033] like Figure 3 As shown, the rotating variable diameter ring 24 has a set of circumferentially distributed, elongated straight holes extending along the diameter direction on its ring plate, such as... Figure 4As shown, the fixed diameter ring 22 has a set of circumferentially distributed oblique holes extending along the inclined diameter direction. The straight holes of the rotating diameter ring 24 correspond circumferentially to the oblique holes of the fixed diameter ring 22. The straight holes of the rotating diameter ring 24 and the corresponding oblique holes of the fixed diameter ring 22 are connected by rotating pins 25, so that the fixed diameter ring 22 and the rotating diameter ring 24 are rotatably connected. Each rotating pin 25 is fitted with a movable stop 23, and the front end of all the movable stops 23 blocks the inner hole of the rotating diameter ring 24.

[0034] During flash evaporation, the fixed support ring 21 is driven to slide along the guide rail 5 by the replacement drive assembly 4, so that the inner holes of the fixed support ring 21, the fixed variable diameter ring 22 and the rotating variable diameter ring 24 are coaxially connected with the outlet of the feed pipe 1; when changing the orifice plate, the fixed support ring 21 is driven to slide along the guide rail 5 to the replacement station by the replacement drive assembly 4.

[0035] The lower end of the outer ring of the fixed support ring 21 is fixed with a slider 7, and the fixed support ring 21 is slidably connected to the guide rail 5 through the slider 7.

[0036] The front end of the movable stop 23 is a triangular protrusion, so that the flow port formed by the movable stop 23 is close to a circle during the expansion and contraction process.

[0037] The replacement drive assembly 4 includes a rotary motor 41 fixed on the flash evaporator support frame 6, a lead screw guide sleeve 42 fixed at the lower end of the fixed support ring 21, and a lead screw 43 connected between the output shaft of the rotary motor 41 and the lead screw guide sleeve 42. The rotary motor 41 drives the fixed support ring 21 to move along the guide rail 5 by rotating the lead screw 43, so that the rotary variable diameter ring 24 is connected to or disconnected from the outlet end of the feed pipe 1.

[0038] like Figure 5 , 6 As shown, the variable diameter drive assembly 3 includes an electric push rod 31 and a push-pull rod 32 with its two ends hinged to the rotating variable diameter ring 24 and the output rod of the electric push rod 31, respectively. The electric push rod 31 controls the rotating variable diameter ring 24 to rotate relative to the fixed variable diameter ring 22 through the push-pull rod 32.

[0039] The variable diameter drive assembly 3 includes an electric push rod 31 fixed on the flash evaporator support frame 6, a push-pull rod 32 connected between the output rod of the electric push rod 31 and the outer ring of the rotating variable diameter ring 24, and a latch 35 rotatably connected to the outer ring of the rotating variable diameter ring 24 via a vertical shaft.

[0040] The lower end of the latch 35 is a vertical shaft connecting part 351, and the upper end of the latch 35 is a latch body 352 with a horizontal push-pull rod connecting hole. Two spaced baffles 353 are arranged on the outer side of the right end of the latch body 352 with the push-pull rod connecting hole. The inner side of the two baffles 353 and the end of the latch body 352 are provided with locking plate slots.

[0041] The left end sidewall of the push-pull rod 32 is fitted with a hinge joint 34, which is hinged to the output rod of the electric push rod 31 via a vertical shaft; the right end of the push-pull rod 32 is vertically fixed with a locking piece 36, and the right end of the push-pull rod 32 is slidably inserted into the push-pull rod connection hole of the latch body 352.

[0042] When the replacement drive assembly 4 drives the fixed support ring 21 to slide along the guide rail 5 to the flash evaporation station, the latch 35 slides along the push-pull rod 32 until the locking piece 36 is axially aligned with the slot. By rotating the push-pull rod 32, the locking piece 36 is inserted into the slot, thereby locking the latch body 352 of the latch 35 with the push-pull rod 32. The electric push rod 31 controls the rotating variable diameter ring 24 to rotate relative to the fixed variable diameter ring 22 through the push-pull rod 32. When replacing the perforated plate, by rotating the push-pull rod 32, the rectangular locking piece 36 is misaligned with the slot, thereby unlocking the latch body 352 of the latch 35 from the push-pull rod 32. The replacement drive assembly 4 then drives the fixed support ring 21 to slide along the guide rail 5 to the replacement station.

[0043] A distance sensor 33 is provided at the front end of the output rod of the electric push rod 31 to detect the extension length of the output rod. Since the extension length of the output rod of the electric push rod 31 is proportional to the change in the occlusion area of ​​the inner hole of the rotating diameter ring 24, the extension length control of the output rod of the electric push rod 31 can be used to control the occlusion area of ​​the inner hole of the rotating diameter ring 24.

[0044] A lever 37 is fixed to the side wall of the push-pull rod 32 for rotating the push-pull rod 32.

[0045] The flash evaporator support frame 6 is provided with a retaining ring 38 corresponding to the position of the lever 37. When the locking body 352 of the latch 35 and the push-pull rod 32 are in the locked state, the retaining ring 38 limits the rotation direction of the lever 37.

Claims

1. A variable diameter device for the feed pipe orifice plate of an automatically replaceable flash evaporator, characterized in that, Includes a flash evaporator support frame (6), a guide rail (5) mounted on the flash evaporator support frame (6), a perforated plate diameter changing mechanism (2) slidably connected to the guide rail (5), a diameter changing drive assembly (3) for driving the perforated plate diameter changing mechanism (2) to change diameter, and a replacement drive assembly (4) for driving the perforated plate diameter changing mechanism (2) to slide along the guide rail (5). The orifice plate diameter changing mechanism (2) includes a fixed support ring (21) slidably connected to the guide rail (5), a fixed diameter changing ring 22 fixed to the upper ring plate of the fixed support ring (21), a rotating diameter changing ring (24) rotatably connected to the upper ring plate of the fixed diameter changing ring (22), and a set of movable stops (23) installed between the fixed diameter changing ring (22) and the rotating diameter changing ring (24). The rotating diameter ring (24) has a set of circumferentially distributed straight holes extending along the diameter direction on its ring plate, and the fixed diameter ring (22) has a set of circumferentially distributed oblique holes extending along the inclined diameter direction on its ring plate. Each straight hole of the rotating diameter ring (24) corresponds circumferentially to each oblique hole of the fixed diameter ring (22). The fixed diameter ring (22) and the rotating diameter ring (24) are rotatably connected by rotating pins (25) respectively inserted between each straight hole of the rotating diameter ring (24) and the corresponding oblique holes of the fixed diameter ring (22). Each rotating pin (25) is fitted with a movable stop (23), and the front end of all movable stops (23) blocks the inner hole of the rotating diameter ring (24). During flash evaporation, the fixed support ring (21) is driven to slide along the guide rail (5) by the replacement drive assembly (4), so that the inner holes of the fixed support ring (21), the fixed variable diameter ring (22) and the rotating variable diameter ring (24) are coaxially connected with the outlet of the feed pipe 1; when changing the orifice plate, the fixed support ring (21) is driven to slide along the guide rail (5) to the replacement station by the replacement drive assembly (4).

2. The automatically replaceable flash evaporator feed pipe orifice plate reducing device as described in claim 1, characterized in that, The lower end of the outer ring of the fixed support ring (21) is fixed with a slider (7), and the fixed support ring (21) is slidably connected to the guide rail (5) through the slider (7).

3. The automatically replaceable flash evaporator feed pipe orifice plate reducing device as described in claim 1, characterized in that, The front end of the movable stop (23) is a triangular protrusion, so that the flow port formed by the movable stop (23) is close to a circle during the expansion and contraction process.

4. The automatically replaceable flash evaporator feed pipe orifice plate reducing device as described in claim 1, characterized in that, The replacement drive assembly (4) includes a rotating motor (41) fixed on the flash evaporator support frame (6), a lead screw guide sleeve (42) fixed at the lower end of the fixed support ring (21), and a lead screw (43) connected between the output shaft of the rotating motor (41) and the lead screw guide sleeve (42). The rotating motor (41) drives the fixed support ring (21) to move along the guide rail (5) by rotating the lead screw (43), so that the rotating variable diameter ring (24) is connected to or disconnected from the outlet end of the feed pipe 1.

5. The automatically replaceable flash evaporator feed pipe orifice plate reducing device as described in claim 1, characterized in that, The variable diameter drive assembly (3) includes an electric push rod (31) and a push-pull rod (32) with both ends hinged to the output rod of the rotating variable diameter ring (24) and the electric push rod (31), respectively. The electric push rod (31) controls the rotating variable diameter ring (24) to rotate relative to the fixed variable diameter ring (22) through the push-pull rod (32).

6. The automatically replaceable flash evaporator feed pipe orifice plate reducing device as described in any one of claims 1-5, characterized in that, The variable diameter drive assembly (3) includes an electric push rod (31) fixed on the flash evaporator support frame (6), a push-pull rod (32) connected between the output rod of the electric push rod (31) and the outer ring of the rotating variable diameter ring (24), and a latch (35) rotatably connected to the outer ring of the rotating variable diameter ring (24) via a vertical shaft. The lower end of the latch (35) is a vertical shaft connecting part (351), and the upper end of the latch (35) is a latch body (352) with a horizontal push-pull rod connecting hole. The latch body (352) has two mutually spaced baffles (353) arranged on the outer side of the right end of the push-pull rod connecting hole. The inner side of the two baffles (353) and the end of the latch body (352) have locking plate slots. The left end of the push-pull rod (32) is fitted with a hinge joint (34), which is hinged to the output rod of the electric push rod (31) via a vertical shaft; the right end of the push-pull rod (32) is vertically fixed with a locking piece (36), and the right end of the push-pull rod (32) is slidably inserted into the push-pull rod connection hole of the latch body (352); When the replacement drive assembly (4) drives the fixed support ring (21) to slide along the guide rail (5) to the flash evaporation station, the latch (35) slides along the push-pull rod (32) until the locking piece (36) is axially aligned with the slot. By rotating the push-pull rod (32), the locking piece (36) is inserted into the slot, thereby locking the latch body (352) of the latch (35) with the push-pull rod (32). The electric push rod (31) controls the rotating variable diameter ring (24) to rotate relative to the fixed variable diameter ring (22) through the push-pull rod (32). When replacing the perforated plate, by rotating the push-pull rod (32), the rectangular locking piece (36) is misaligned with the slot, thereby unlocking the latch body (352) of the latch (35) with the push-pull rod (32). The replacement drive assembly (4) drives the fixed support ring (21) to slide along the guide rail (5) to the replacement station.

7. The automatically replaceable flash evaporator feed pipe orifice plate reducing device as described in claim 6, characterized in that, A distance sensor (33) is provided at the front end of the output rod of the electric push rod (31), and the extension length of the output rod of the electric push rod (31) is detected by the distance sensor (33). Since the extension length of the output rod of the electric push rod (31) is proportional to the change in the blocking area of ​​the inner hole of the rotating diameter ring (24), the extension length of the output rod of the electric push rod (31) can be used to control the blocking area of ​​the inner hole of the rotating diameter ring (24).

8. The automatically replaceable flash evaporator feed pipe orifice plate reducing device as described in claim 6, characterized in that, A lever (37) is fixed to the side wall of the push-pull rod (32) for rotating the push-pull rod (32).

9. The automatically replaceable flash evaporator feed pipe orifice plate reducing device as described in claim 6, characterized in that, The flash evaporator support frame (6) is provided with a retaining ring (38) corresponding to the position of the lever (37). When the locking body (352) of the latch (35) and the push-pull rod (32) are in a locked state, the retaining ring (38) limits the rotation direction of the lever (37).

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