CN219338066U - Mortar recovery device of horizontal type guniting machine - Google Patents

Abstract

The application discloses a mortar recovery device of a horizontal type mortar spraying machine, which relates to the technical field of prestressed steel cylinder concrete pipe production equipment, and is characterized in that a mortar recovery unit is added on the basis of the existing horizontal type mortar spraying machine, the mortar recovery unit comprises a recovery disc and a mortar guiding recovery device, the recovery disc is fixedly arranged on a rotary movable support and is used for collecting mortar which is sprayed out from a mortar spraying head and cannot be adhered to a core of a prestressed steel cylinder concrete pipe; the mortar guiding and recycling device is fixedly arranged on one side of the frame and is positioned right above the guniting head and used for guiding upwards splashed mortar sprayed by the guniting head to enter the conveyor belt. In addition, the recovery disc is subjected to tilting and damping treatment, and the vibration motor is arranged, so that scattered mortar can be easily and quickly collected, and the baffle plate is arranged on the recovery disc, so that the loss of the mortar can be reduced when the pipe end part is sprayed with the mortar. The whole device is reasonable in design, ingenious in structure, high in efficiency, good in stability and convenient to assemble and overhaul.

Description

Mortar recovery device of horizontal type guniting machine

Technical Field

The application relates to the technical field of prestressed steel cylinder concrete pipe production equipment, in particular to a mortar recovery device of a horizontal type guniting machine.

Background

The prestressed steel cylinder concrete pipe (Prestressed Concrete Cylinder Pipe, abbreviated as PCCP) is a water pipe which is manufactured by winding circumferential prestressed steel wires on a high-strength concrete pipe core with a steel cylinder and spraying a compact cement mortar protection layer on the steel wire. The novel composite pipe is formed by manufacturing processes of steel plate, prestressed steel wire, concrete and cement mortar, wherein the manufacturing processes comprise steel cylinder forming, concrete pouring, application of a prestress control technology, spraying of a protective layer and the like. In the production process, cement mortar needs to be sprayed on the pipe by using a mortar spraying machine, and the existing horizontal mortar spraying machine is not provided with a corresponding structure for preventing mortar from splashing, so that mortar splashes everywhere when mortar spraying occurs, thick mortar is piled up nearby mortar spraying equipment, manual cleaning and recycling are required, the environment is influenced, and the workload of operators is increased.

Disclosure of Invention

In order to solve the problems, the application adopts the following technical scheme:

a mortar recovery device for a horizontal mortar sprayer, comprising:

the slurry spraying machine comprises a frame, a slurry spraying head, a conveyor belt and a hopper, wherein the slurry spraying head is fixedly arranged on one side of the frame, the conveyor belt is arranged in the frame, the hopper is fixedly arranged on the frame, one end of the conveyor belt is contacted with the slurry spraying head, and the conveyor belt is positioned below the hopper; the hopper is filled with mixed fine sand and cement paste, mortar falls into a conveyor belt from the opening, the conveyor belt moves with the mortar and is fed into a mortar spraying head, the mortar spraying head is two rotating wheels with a key groove structure, the mortar can be contained in the key groove, the mortar can be thrown out by centrifugal force generated when the rotating wheels rotate at high speed, and the mortar is sprayed to a prestressed steel cylinder concrete pipe core arranged on a prestressed steel cylinder concrete pipe rotating and moving unit from between the two rotating wheels, so that the mortar spraying operation is realized.

The prestress steel cylinder concrete pipe rotary moving unit comprises a guide rail and a rotary moving bracket, wherein the guide rail is fixedly arranged on one side of the guniting machine, the rotary moving bracket can be arranged on the guide rail in a reciprocating manner, and the prestress steel cylinder concrete pipe core can be fixed on the rotary moving bracket; the rotary moving support can clamp the core of the prestressed steel cylinder concrete pipe and rotate along the axis of the pipe, and can reciprocate along the guide rail. When the grouting is needed, the rotary moving support rotates slowly with the prestress steel cylinder concrete pipe core, and the mortar sprayed by the grouting head slowly passes through the grouting head of the grouting machine along the axial direction of the prestress steel cylinder concrete pipe core, the mortar sprayed by the grouting head is sprayed onto the pipe core, the prestress steel cylinder concrete pipe core rotates and moves at the same time, and after a certain time, the whole pipe core is sprayed with the mortar.

The mortar recovery unit comprises a recovery disc and a mortar guiding recovery device, wherein the recovery disc is fixedly arranged on the rotary moving support, and when the prestress steel cylinder concrete pipe core is installed on the rotary moving support, the recovery disc is positioned below the prestress steel cylinder concrete pipe core and is used for collecting mortar which is sprayed from the guniting head and cannot be adhered to the prestress steel cylinder concrete pipe core; the mortar guiding and recycling device is fixedly arranged on one side of the frame and is positioned right above the guniting head and used for guiding upwards splashed mortar sprayed by the guniting head to enter the conveyor belt. The mortar sprayed by the mortar spraying head is parallel to the ground, but because the prestress steel cylinder concrete pipe core is rotated and is positioned on one side of the mortar spraying head upwards, most of the mortar which is sprayed by the mortar spraying head and cannot be adhered to the pipe core is driven to be splashed upwards, and the mortar guiding and recycling device is arranged on a path through which the mortar is splashed and guides the splashed mortar to return to the conveyor belt again, so that the waste is reduced and the environment is kept free from pollution.

Preferably, the mortar guiding and recycling device comprises a guiding box and a guiding chute, wherein the guiding box is of an L-shaped hollow structure, two ends of the guiding box are respectively opened, the bottom end of the guiding box is a feeding hole, the upper end of the guiding box is a discharging hole, the guiding chute is fixedly arranged below the discharging hole, and the other end of the guiding chute is positioned on the conveying belt.

Preferably, the guide box is formed by welding stainless steel materials;

two recovery device fixed beams are vertically welded on one side of the frame, and the mortar guiding recovery device is fixedly arranged between the two recovery device fixed beams.

Preferably, a guide baffle is fixedly arranged on the discharge hole, and forms an included angle with the guide box, so that splashed mortar can be blocked on the guide chute.

Preferably, the recovery tray comprises a tray body, and the tray body is welded into a square container structure with an open top by adopting a stainless steel plate.

Preferably, a damping rubber pad is fixedly arranged at the front end of the bottom of the disc body, and the bottom end of the damping rubber pad is fixedly connected with the rotary moving bracket; the shock-absorbing rubber pad adopts rubber to make the cylinder structure, and its one end and the pan body fixed connection, the base upper portion fixed connection of the other end and rotatory movable support are provided with 5 altogether, and the alignment is in a word respectively for reduce the influence of pan body vibration to whole rotatory movable support.

The bottom rear end of the tray body is fixedly provided with a damping spring, the bottom of the damping spring is fixedly connected with the rotary moving support, the height of the damping spring is greater than that of the damping rubber pad, and the whole tray body is inclined forwards. The design can ensure that the tray body inclines to one side, and the tray body can be knocked when needed so that mortar falling into the tray body vibrates and is converged towards the inclined direction, and collection and movement are facilitated.

Preferably, a vibration motor is also fixedly arranged at the bottom of the tray body. The vibration motor is a motor with an eccentric pendulum bob arranged on a rotating shaft, and can generate vibration force after rotating to drive the whole disc body to vibrate, so that mortar can be automatically collected.

Preferably, a pulp discharging port is formed in the side face of the front end of the disc body, a pulp discharging groove is fixedly formed in one side of the pulp discharging port, and the cross section of the pulp discharging groove is of a U-shaped structure.

Preferably, both sides of the front end of the tray body are rotatably provided with a shutter, respectively, which can be rotated by 90 °. The purpose of design baffle mainly is when taking into account the pipe core both ends and spouting the thick liquid, because the tip at pipe core both ends does not have the barrier, and the mortar can directly jet out, causes little waste, after using the baffle, just can avoid such waste: the two baffles are positioned at the two ends of the tube core, and after the two baffles are erected, the mortar can be just blocked, and the blocked mortar can move downwards along the baffles to enter the tray body.

Preferably, the cross section of the baffle plate is in an L-shaped structure or in a U-shaped structure. The structure is more convenient for collecting the mortar, and prevents the mortar from being sputtered and dispersed again after impacting the baffle.

According to the mortar recovery device of the horizontal type mortar spraying machine, a mortar recovery unit is added on the basis of an existing horizontal type mortar spraying machine, the mortar recovery unit comprises a recovery disc and a mortar guiding recovery device, and the recovery disc is fixedly arranged on a rotary moving support and used for collecting mortar which is sprayed out from a mortar spraying head and cannot be adhered to a core of a prestressed steel cylinder concrete pipe; the mortar guiding and recycling device is fixedly arranged on one side of the frame and is positioned right above the guniting head and used for guiding upwards splashed mortar sprayed by the guniting head to enter the conveyor belt. In addition, the recovery disc is subjected to tilting and damping treatment, and the vibration motor is arranged, so that scattered mortar can be easily and quickly collected, and the baffle plate is arranged on the recovery disc, so that the loss of the mortar can be reduced when the pipe end part is sprayed with the mortar. The whole device is reasonable in design, ingenious in structure, high in efficiency, good in stability and convenient to assemble and overhaul.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment provided herein;

FIG. 2 is a front view of an embodiment provided herein;

FIG. 3 is a left side view of an embodiment provided herein;

FIG. 4 is a top view of an embodiment provided herein;

FIG. 5 is a schematic perspective view of a rotary motion unit of a prestressed steel cylinder concrete pipe in an embodiment provided by the application;

FIG. 6 is a schematic perspective view of another perspective view of a prestressed steel cylinder concrete pipe rotary motion unit according to an embodiment provided in the present application;

FIG. 7 is an exploded view of a prestressed steel cylinder concrete pipe rotary motion unit and a recovery disk in an embodiment provided herein;

FIG. 8 is a schematic perspective view of a disk body according to an embodiment of the present application;

FIG. 9 is a schematic diagram of a slurry guide recycling apparatus and a slurry sprayer according to an embodiment of the present disclosure;

FIG. 10 is a schematic perspective view of a slurry guide recycling apparatus according to an embodiment of the present disclosure;

FIG. 11 is a cross-sectional view of a slurry guide reclamation apparatus in an embodiment provided herein;

fig. 12 is a schematic view of a die-down baffle as installed in accordance with an embodiment provided herein;

FIG. 13 is a schematic diagram of a completed die attach riser fence in accordance with an embodiment provided herein;

fig. 14 is a schematic perspective view of another view of the die after installing the upstanding baffle in accordance with the embodiments provided herein.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to fig. 1 to 14 in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application. Accordingly, the following detailed description of the embodiments of the present application, provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

As shown in fig. 1 to 11, a mortar recovery device of a horizontal type mortar spraying machine comprises a mortar spraying machine 1, a prestressed steel cylinder concrete pipe rotary moving unit 2 and a mortar recovery unit 3, wherein:

the guniting machine 1, as shown in fig. 1-3 and fig. 9, comprises a frame 10, a guniting head 11, a conveyor belt 12 and a hopper 13, wherein the guniting head 11 is fixedly arranged on one side of the frame 10, the conveyor belt 12 is arranged in the frame 10, the hopper 13 is fixedly arranged on the frame 10, one end of the conveyor belt 12 is in contact with the guniting head 11, and the conveyor belt 12 is positioned below the hopper 13. The hopper 13 is filled with mixed fine sand and cement paste, the bottom opening of the hopper 13 is provided with mortar, the mortar falls onto the conveyor belt 12 from the opening, the conveyor belt 12 moves with the mortar and is fed into the guniting head 11, the guniting head 11 is two rotating wheels with a key slot structure, the mortar can be contained in the key slot, the mortar can be thrown out by centrifugal force generated when the rotating wheels rotate at high speed, and the mortar is sprayed between the two rotating wheels to the prestressed steel cylinder concrete pipe core arranged on the prestressed steel cylinder concrete pipe rotating and moving unit 2, so that the guniting operation is realized.

The prestress steel cylinder concrete pipe rotary moving unit 2 comprises a guide rail 20 and a rotary moving bracket 21, wherein the guide rail 20 is fixedly arranged on one side of the guniting machine 1, the rotary moving bracket 21 is arranged on the guide rail 20 in a reciprocating manner, and the prestress steel cylinder concrete pipe core 4 can be fixed on the rotary moving bracket 21; the rotary moving bracket 21 can clamp and rotate the prestressed concrete cylinder pipe core 4 along the axis of the pipe, and can reciprocate along the guide rail 20. When the grouting is needed, the rotary moving support 21 drives the prestressed steel cylinder concrete pipe core 4 to slowly rotate, mortar sprayed by the grouting head 11 slowly passes through the grouting head 11 of the grouting machine 1 along the axial direction of the prestressed steel cylinder concrete pipe core 4, the prestressed steel cylinder concrete pipe core 4 rotates and moves, and the whole pipe core is sprayed with the mortar after a certain time.

A mortar recovery unit 3 including a recovery tray 30 and a mortar guiding recovery device 31, the recovery tray 30 being fixedly disposed on the upper surface of the rotary moving bracket 21, the recovery tray 30 being located under the prestressed steel cylinder concrete pipe core 4 when the prestressed steel cylinder concrete pipe core 4 is mounted to the rotary moving bracket 21, for collecting mortar ejected from the mortar ejection head 11 that cannot be adhered to the prestressed steel cylinder concrete pipe core 4; the mortar guiding and recycling device 31 is fixedly arranged on one side of the frame 10 and right above the guniting head 11, and is used for guiding the upward splashed mortar sprayed by the guniting head 11 to enter the conveyor belt 12. The mortar sprayed by the mortar spraying head 11 is parallel to the ground, but because the prestress steel cylinder concrete pipe core 4 is rotated and is positioned on one side of the mortar spraying head 11 upwards, most of the mortar which is sprayed by the mortar spraying head 11 and cannot be adhered to the pipe core is driven to be splashed upwards, and the mortar guiding and recycling device 31 is arranged on a path of the splashed mortar, and guides the splashed mortar to be returned to the conveyor belt 12, so that the waste is reduced and the environment is kept from being polluted.

Further, as shown in fig. 9-11, the mortar guiding and recycling device 31 includes a guiding box 310 and a guiding chute 311, the guiding box 310 is in an L-shaped hollow structure, two ends of the guiding box are respectively open, the bottom end is a feeding port, the upper end is a discharging port, the guiding chute 311 is fixedly arranged below the discharging port, and the other end of the guiding chute 311 is located on the conveyor belt 12. The guide box 310 is formed by welding stainless steel materials, so that the guide box is convenient to clean and effectively prevents mortar from adhering. Two recovery device fixing beams 14 are vertically welded on one side of the frame 10, and the mortar guiding recovery device 31 is fixedly arranged between the two recovery device fixing beams 14. In addition, a guide baffle 312 is fixedly arranged on the upper surface of the discharge hole, and the guide baffle 312 and the guide box 310 form an included angle, so that splashed mortar can be blocked on the guide chute 311.

As shown in fig. 7 and 8, the recovery tray 30 includes a tray body 300, and the tray body 300 is welded into a square container structure with an open top using stainless steel plates. A damping rubber pad 301 is fixedly arranged at the front end of the bottom of the tray body 300, and the bottom end of the damping rubber pad 301 is fixedly connected with the rotary moving bracket 21; the shock-absorbing rubber pad 301 is made of rubber into a cylindrical structure, one end of the shock-absorbing rubber pad is fixedly connected with the disc body 300, the other end of the shock-absorbing rubber pad is fixedly connected with the upper portion of the base of the rotary moving support 21, and 5 shock-absorbing rubber pads are arranged in a straight line respectively and are used for reducing the influence of vibration of the disc body 300 on the whole rotary moving support 21. The bottom rear end of the tray body 300 is fixedly provided with a damping spring 302, the bottom of the damping spring 302 is fixedly connected with the rotary moving support 21, the height of the damping spring 302 is greater than that of the damping rubber pad 301, and the whole tray body 300 is inclined forwards. Such a design can ensure that the tray body 300 is inclined to one side and can strike the tray body 300 when necessary so that mortar falling therein vibrates and gathers toward an inclined direction, facilitating collection and movement. The bottom of the tray body 300 is also fixedly provided with a vibration motor 303. The vibration motor 303 is a motor with an eccentric pendulum provided on a rotating shaft, and can generate vibration force after rotating to drive the whole disc body 300 to vibrate, so that mortar can be automatically collected.

In addition, as shown in fig. 8, a slurry outlet 3000 is formed on the front side of the tray body 300, and a slurry outlet groove is fixedly formed on one side of the slurry outlet, and the cross section of the slurry outlet groove is in a U-shaped structure. Both sides of the front end of the disc body 300 are rotatably provided with a baffle 3001, respectively, and the baffle 3001 can be rotated by 90 °. The purpose of designing baffle 3001 is mainly to consider when spouting the battery core both ends, because the tip at battery core both ends does not have the barrier, and the mortar can directly jet out, causes little waste, after using baffle 3001, just can avoid such waste: two baffles 3001 are positioned at the ends of the die to block the slurry just after standing up, and the blocked slurry can move down along the baffles 3001 into the tray body 300. The cross section of the baffle 3001 is in an L-shaped structure or a U-shaped structure. The structure is more convenient for collecting the mortar, and prevents the mortar from being sputtered and dispersed again after impacting the baffle. Fig. 12 is a schematic view of the embodiment provided herein when the die-down baffle is mounted, fig. 13 is a schematic view of the embodiment provided herein when the die-up baffle is mounted, and fig. 14 is a schematic view of the embodiment provided herein when the die-up baffle is mounted, from another perspective.

The mortar recovery unit 3 is added on the basis of the existing horizontal mortar spraying machine, the mortar recovery unit 3 comprises a recovery disc 30 and a mortar guiding recovery device 31, and the recovery disc 30 is fixedly arranged on the rotary moving support 21 and is used for collecting mortar which is sprayed from the mortar spraying head 11 and cannot be adhered to the prestress steel cylinder concrete pipe core 4; the mortar guiding and recovering device 31 is fixedly arranged at one side of the frame 10 and is positioned right above the guniting head 11, and is used for guiding the upward splashed mortar sprayed by the guniting head 11 to enter the conveyor belt 12. In addition, the recovery disk 30 is subjected to tilting and damping treatment, and a vibration motor is arranged, so that scattered mortar can be easily and quickly collected, and a baffle plate is arranged on the recovery disk 30, so that the loss of the mortar can be reduced when the pipe end part is sprayed with the mortar. The whole device is reasonable in design, ingenious in structure, high in efficiency, good in stability and convenient to assemble and overhaul.

Claims (10)

1. A mortar recovery device for a horizontal mortar sprayer, comprising:

the slurry spraying machine (1) comprises a frame (10), a slurry spraying head (11), a conveying belt (12) and a hopper (13), wherein the slurry spraying head (11) is fixedly arranged on one side of the frame (10), the conveying belt (12) is arranged in the frame (10), the hopper (13) is fixedly arranged on the frame (10), one end of the conveying belt (12) is in contact with the slurry spraying head (11), and the conveying belt (12) is positioned below the hopper (13);

the prestress steel cylinder concrete pipe rotary moving unit (2) comprises a guide rail (20) and a rotary moving bracket (21), wherein the guide rail (20) is fixedly arranged on one side of the guniting machine (1), the rotary moving bracket (21) is arranged on the guide rail (20) in a reciprocating manner, and a prestress steel cylinder concrete pipe core (4) can be fixed on the rotary moving bracket (21);

the mortar recovery unit (3) comprises a recovery disc (30) and a mortar guiding recovery device (31), wherein the recovery disc (30) is fixedly arranged on the rotary moving support (21) and is used for collecting mortar which is ejected from the mortar spraying head (11) and cannot be adhered to the prestressed steel cylinder concrete pipe core (4); the mortar guiding and recycling device (31) is fixedly arranged on one side of the frame (10) and is positioned right above the mortar spraying head (11) and used for guiding upwards splashed mortar sprayed by the mortar spraying head (11) to enter the conveyor belt (12).

2. The mortar recovery device of a horizontal mortar sprayer according to claim 1, wherein:

the mortar guiding and recycling device (31) comprises a guiding box (310) and a guiding chute (311), the guiding box (310) is of an L-shaped hollow structure, two ends of the guiding box are respectively opened, the bottom end of the guiding box is a feeding hole, the upper end of the guiding box is a discharging hole, the guiding chute (311) is fixedly arranged below the discharging hole, and the other end of the guiding chute (311) is positioned on the conveying belt (12).

3. The mortar recovery device of a horizontal mortar sprayer according to claim 2, wherein:

the guide box (310) is formed by welding stainless steel materials;

two recovery device fixing beams (14) are vertically welded on one side of the frame (10), and the mortar guiding recovery device (31) is fixedly arranged between the two recovery device fixing beams (14).

4. The mortar recovery device of a horizontal mortar sprayer according to claim 2, wherein:

the upper surface of the discharge hole is also fixedly provided with a guide baffle plate (312), the guide baffle plate (312) and the guide box (310) form an included angle, and splashed mortar can be blocked on the guide chute (311).

5. The mortar recovery device of a horizontal mortar sprayer according to claim 1, wherein:

the recovery disc (30) comprises a disc body (300), and the disc body (300) is welded into a square container structure with an open top by adopting a stainless steel plate.

6. The mortar recovery device of a horizontal mortar sprayer of claim 5, wherein:

the front end of the bottom of the tray body (300) is fixedly provided with a damping rubber pad (301), and the bottom end of the damping rubber pad (301) is fixedly connected with the rotary moving bracket (21);

the novel rotary disc is characterized in that a damping spring (302) is fixedly arranged at the rear end of the bottom of the disc body (300), the bottom of the damping spring (302) is fixedly connected with the rotary moving support (21), the height of the damping spring (302) is larger than that of the damping rubber pad (301), and the whole disc body (300) is inclined forwards.

7. The mortar recovery device of a horizontal mortar sprayer of claim 6, wherein:

the bottom of the tray body (300) is also fixedly provided with a vibration motor (303).

8. The mortar recovery device of a horizontal mortar sprayer of claim 5, wherein:

the front end side of the tray body (300) is provided with a slurry discharge port (3000), one side of the slurry discharge port is fixedly provided with a slurry discharge groove, and the cross section of the slurry discharge groove is of a U-shaped structure.

9. The mortar recovery device of a horizontal mortar sprayer of claim 5, wherein:

both sides of the front end of the disc body (300) are respectively rotatably provided with a baffle plate (3001), and the baffle plates (3001) can rotate by 90 degrees.

10. The mortar recovery device of a horizontal mortar sprayer of claim 9, wherein:

the cross section of the baffle plate (3001) is in an L-shaped structure or a U-shaped structure.

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