Continuous monitoring device for carbon emission of stationary pollution source

Abstract

The invention discloses a stationary pollution source carbon emission continuous monitoring device, and relates to the technical field of air pollution detection, the stationary pollution source carbon emission continuous monitoring device comprises a case and a driving assembly, one side of the case is fixedly provided with a monitor main body, the bottom of the case is provided with a fixed pipe, and the outer side of the lower end of the fixed pipe is rotatably connected with a reversing pipe; and filters are arranged in the two ends of the reversing pipe. When the carbon emission content of a pollution source is monitored, the motor is started firstly, the sliding seat is driven to reciprocate through the double-output-shaft speed reducer and the reciprocating lead screw, the piston rod slides in one cavity in the case in a reciprocating mode, and therefore the air pressure change in the case is adjusted; the inside of one end of the reversing pipe is communicated with the inside of the case through the fixing pipe, so that external to-be-detected gas can be sucked into the case through the first one-way valve, and at the moment, the carbon dioxide sensor probe on the monitor main body can monitor the carbon content of the air.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air pollution detection, in particular to a fixed pollution source carbon emission continuous monitoring device. BACKGROUND

[0002] Carbon emission monitoring refers to a process of obtaining information on carbon source and sink conditions and trends, such as greenhouse gas emission intensity, environmental concentration, ecological system carbon sink, and impact on ecological system, through comprehensive observation, numerical simulation, statistical analysis, and other means, for the purpose of serving climate change research and management. The fixed pollution source carbon emission monitoring device is a device for continuously monitoring carbon dioxide emissions from fixed pollution sources such as factories and power plants.

[0003] A building carbon emission continuous monitoring device is disclosed in patent CN220584184U. The device can reverse blow the filter through the setting of the reverse blow pipe, prolonging the service life of the filter. However, when the filter needs to be reverse blown, the monitoring device cannot monitor the flue gas in real time. Moreover, since the blowing direction is consistent with the monitoring direction, it will interfere with the subsequent monitoring results. In addition, when used in places with heavy pollution sources such as factories, the dust content is high, and frequent reverse blowing and cleaning are required, which will affect the overall continuous monitoring effect of the device.

[0004] Therefore, in view of the existing structure and deficiencies, a fixed pollution source carbon emission continuous monitoring device is proposed. SUMMARY

[0005] The present application aims to provide a fixed pollution source carbon emission continuous monitoring device to solve the problems mentioned in the background.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a fixed-pollution-source carbon emission continuous monitoring device, comprising a case and a driving assembly, one side of the case is fixed with a monitor main body, and the bottom of the case is provided with a fixed pipe, the outer side of the lower end of the fixed pipe is rotationally connected with a reversing pipe, and the inner sides of the two ends of the reversing pipe are both provided with filters, the driving assembly is arranged on the top of the fixed pipe, the driving assembly comprises a motor, a double-output-shaft speed reducer, a reciprocating lead screw, a sliding seat, a piston rod, a first one-way valve, a second one-way valve and a jet hole, the top of the case is fixed with the motor, one end of the motor is provided with the double-output-shaft speed reducer, the end of the double-output-shaft speed reducer is connected with the reciprocating lead screw, the outer side of the reciprocating lead screw is provided with the sliding seat, one side of the lower end of the sliding seat is fixed with the piston rod, the inner side of the case is centrally and symmetrically provided with the first one-way valve, the bottom of the case is symmetrically fixed with the second one-way valve, the second one-way valve is connected in communication with the inner side of the fixed pipe through a pipeline, and the lower end of the fixed pipe is provided with the jet hole on one side.

[0007] Further, the inner side of the fixed pipe is provided with two flow channels, and the fixed pipe is connected in communication with the inner side of one end of the case through a pipeline.

[0008] Further, the top of the reversing pipe is provided with a rotating assembly, and the rotating assembly comprises a speed reducer, a cam and a rubber roller, the top of the double-output-shaft speed reducer is connected with the speed reducer, the output shaft of the speed reducer is fixed with the cam, and the top of the cam is provided with the rubber roller.

[0009] Further, the rotating assembly further comprises a side plate, a guide sleeve and a driving ring, the two ends of the rubber roller are both fixed with the side plate, the outer side of the side plate is sleeved with the guide sleeve, and the bottom of the side plate is connected with the driving ring.

[0010] Further, the guide sleeve is fixedly connected with the case, and the case is slidingly connected with the piston rod.

[0011] Further, the rotating assembly further comprises a spring seat, a driving column and a compression spring, the top of the driving ring is symmetrically provided with the spring seat at both ends, the inner side of one end of the driving ring is slidingly connected with the driving column, and the outer side of one end of the driving column is provided with the compression spring.

[0012] Further, the rotating assembly further comprises a driving sleeve, a guide groove and a guide block, the top of the reversing pipe is fixed with the driving sleeve, the outer side of the driving sleeve is provided with the guide groove, and the inner side of the guide groove is fixed with the guide block.

[0013] Further, the driving column is slidingly connected with the driving sleeve through the guide groove, and the guide groove is composed of two groups of vertical grooves and inclined grooves.

[0014] Further, one side of the guide sleeve is provided with a brushing assembly, the brushing assembly comprises a rotating shaft, a brush plate and a torsional spring, one side of the guide sleeve is arranged with the rotating shaft, the end of the rotating shaft is connected with the brush plate, and the side upper end of the brush plate is fixed with the torsional spring.

[0015] Further, the brushing assembly further comprises a fixing sleeve, a guide strip and a fixing column, the middle part of the brush plate is fixed with the fixing sleeve, the upper and lower ends of one side of the fixing sleeve are both provided with the guide strip, the bottom of the guide strip is slidably connected with the fixing column, and the fixing column is fixedly connected with the side plate.

[0016] The application provides a fixed-pollution-source carbon emission continuous monitoring device, which has the following beneficial effects: 1、The motor is started first when the carbon emission content of the pollution source is monitored, the double-output-shaft speed reducer and the reciprocating lead screw drive the sliding seat to make reciprocating motion, the piston rod reciprocates in one cavity in the machine box, the air pressure change in the machine box is adjusted, when the air pressure decreases, the inside of one end of the reversing pipe is connected with the inside of the machine box through the fixed pipe, the outside to-be-measured gas can be sucked into the inside of the machine box through the first one-way valve, at this time, the carbon dioxide sensor probe on the monitor main body can monitor the carbon content of the air, when the air pressure increases, the air enters the other flow channel of the fixed pipe from the second one-way valve at the bottom and is sprayed from the air injection hole, so that the back blowing cleaning of the filter is realized, through the design, the other filter that is not used temporarily can be cleaned and maintained synchronously in the monitoring process, subsequent only needs to quickly adjust the direction of the reversing pipe, so that the two filters can be switched, without spending a long time for back blowing cleaning, so that the continuity of the monitor main body in the monitoring process is ensured, in addition, the first one-way valve and the second one-way valve are both provided with two groups, so that the piston rod can continuously convey the gas when reciprocating, the continuity and stability of the monitoring and cleaning process are further improved.

[0017] 2、The motor works, through the cooperation of double output shaft reducer and speed reducer, drives the cam to rotate slowly, the large torque provided by the speed reducer can effectively push the rubber coated roller to move up, and then drive the driving ring to move up synchronously through the side plate, so that the spring seat is in a compressed state, in this process, the driving column will slide along the vertical groove of the guide groove, this design avoids the rotation between the fixed tube and the reversing tube, ensures the stability of the monitoring process, at the same time, since the guide block is inclined, the driving column can extrude the compression spring, and when the rubber coated roller moves to the highest point of the cam, the driving column will just slide to the upper end of the guide block, at this time, the compression spring will push the driving column, so that the bottom of the driving column is attached to the top of the guide block, therefore, when the rubber coated roller passes the highest point of the cam, the spring seat will push the driving ring down under the limiting of the guide sleeve, at the same time, the guide sleeve will limit the rotation of the driving ring through the side plate, so that the compression spring can slide into the inclined groove of the guide groove when moving downward, so that the driving sleeve drives the reversing tube to rotate clockwise for half a circle and then stop, this pure mechanical design does not need additional electric control system, which saves cost and ensures the rapidness and stability of the switching process.

[0018] 3、When the reversing tube rotates, the side of the filter will contact the bottom of the brush plate, so that the side of the filter is brushed and cleaned, so that the attached dust and impurities are swept off, and the fixed column is moved synchronously when the side plate moves up, and when the fixed column contacts the guide strip, the brush plate will rotate around the rotating shaft under the guidance of the inclined surface of the fixed column, so that the side of the filter is brushed and cleaned, and when the brush plate is separated from the guide strip, the torsional spring drives the brush plate to rotate and reset, and the side of the filter is cleaned again, so that the brush plate automatically brushes and cleans the side of the filter during the back blowing and cleaning process, and the multiple cleaning mechanism significantly improves the cleaning effect of the filter and ensures the continuous and efficient operation of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole front view of the fixed pollution source carbon emission continuous monitoring device; Figure 2 It is a cam three-dimensional structure diagram of the fixed pollution source carbon emission continuous monitoring device; Figure 3 It is a machine case internal structure diagram of the fixed pollution source carbon emission continuous monitoring device; Figure 4 It is a fixed tube three-dimensional structure diagram of the fixed pollution source carbon emission continuous monitoring device; Figure 5 It is a rotating assembly part three-dimensional structure diagram of the fixed pollution source carbon emission continuous monitoring device; Figure 6It is a fixed pollution source carbon emission continuous monitoring device drive sleeve three-dimensional structure schematic view of the application; Figure 7 It is a fixed pollution source carbon emission continuous monitoring device overall rear view three-dimensional structure schematic view of the application; Figure 8 It is a fixed pollution source carbon emission continuous monitoring device brush moving assembly three-dimensional structure schematic view of the application.

[0020] In the figure: 1, case; 2, monitor main body; 3, fixed pipe; 4, reversing pipe; 5, filter; 6, drive assembly; 601, motor; 602, double output shaft reducer; 603, reciprocating lead screw; 604, sliding seat; 605, piston rod; 606, first check valve; 607, second check valve; 608, air injection hole; 7, rotating assembly; 701, speed reducer; 702, cam; 703, rubber-coated roller; 704, side plate; 705, guide sleeve; 706, drive ring; 707, spring seat; 708, drive column; 709, compression spring; 710, drive sleeve; 711, guide groove; 712, guide block; 8, brush moving assembly; 801, rotating shaft; 802, brush plate; 803, torsional spring; 804, fixing sleeve; 805, guide bar; 806, fixing column. DETAILED DESCRIPTION

[0021] Please refer to Figures 1 to 4 The application provides a fixed pollution source carbon emission continuous monitoring device, which comprises a case 1 and a drive assembly 6. The case 1 is provided with a monitor main body 2 on one side, and the bottom of the case 1 is provided with a fixed pipe 3. The lower end of the fixed pipe 3 is rotatably connected with a reversing pipe 4, and the two ends of the reversing pipe 4 are internally provided with filters 5. Two flow channels are arranged in the fixed pipe 3, and the fixed pipe 3 is connected with the inside of one end of the case 1 through a pipeline. The drive assembly 6 is arranged on the top of the fixed pipe 3. The drive assembly 6 comprises a motor 601, a double output shaft reducer 602, a reciprocating lead screw 603, a sliding seat 604, a piston rod 605, a first check valve 606, a second check valve 607 and an air injection hole 608. The motor 601 is fixed on the top of the case 1, and the one end of the motor 601 is provided with the double output shaft reducer 602. The end of the double output shaft reducer 602 is connected with the reciprocating lead screw 603, and the outer side of the reciprocating lead screw 603 is provided with the sliding seat 604. The lower end of the sliding seat 604 is fixed with the piston rod 605 on one side. The first check valve 606 is centrally and symmetrically arranged in the inside of the case 1, and the second check valve 607 is symmetrically fixed on the bottom of the case 1. The second check valve 607 is connected with the inside of the fixed pipe 3 through a pipeline, and the lower end of the fixed pipe 3 is provided with the air injection hole 608 on one side. The specific operation is as follows: the motor 601 drives the sliding seat 604 to reciprocate through the double-output shaft reducer 602 and the reciprocating screw rod 603, so that the piston rod 605 reciprocates in one of the cavities in the cabinet 1, thereby changing the air pressure at one end of the cabinet 1. When the air pressure decreases, the outside air is sucked into the cabinet 1 through the first one-way valve 606, because one end of the reversing pipe 4 is connected to the inside of the cabinet 1 through the fixed pipe 3. At this time, the carbon dioxide sensor probe on the monitor body 2 can be used to monitor the carbon content of the air. When the air pressure increases, the air flows from the second one-way valve 607 at the bottom to the other flow passage of the fixed pipe 3, and then is sprayed from the air outlet 608 to clean the filter 5. Therefore, during the monitoring process, the other idle filter 5 can be cleaned and maintained at the same time. Subsequently, the two filters 5 can be switched by quickly changing the direction of the reversing pipe 4, without the need for additional time to clean the filter 5. This is beneficial to maintaining the continuity of the monitoring process of the monitor body 2. The first one-way valve 606 and the second one-way valve 607 are both provided with two groups, so that the piston rod 605 can transport gas during reciprocating motion, which is beneficial to maintaining the continuity of monitoring and cleaning.

[0022] Please refer to Figures 2 to 6 The top of the reversing pipe 4 is provided with a rotating assembly 7, and the rotating assembly 7 comprises a speed reducer 701, a cam 702 and a rubber roller 703. The top of the double-output shaft reducer 602 is connected with the speed reducer 701, and the output shaft of the speed reducer 701 is fixed with the cam 702. The top of the cam 702 is provided with the rubber roller 703. The rotating assembly 7 further comprises a side plate 704, a guide sleeve 705 and a driving ring 706. The two ends of the rubber roller 703 are both fixed with the side plate 704. The outer side of the side plate 704 is sleeved with the guide sleeve 705, and the bottom of the side plate 704 is connected with the driving ring 706. The guide sleeve 705 is fixedly connected with the cabinet 1, and the cabinet 1 is slidably connected with the piston rod 605. The rotating assembly 7 further comprises a spring seat 707, a driving column 708 and a compression spring 709. The top of the driving ring 706 is symmetrically provided with the spring seat 707 at both ends. The inside of one end of the driving ring 706 is slidably connected with the driving column 708, and the outside of one end of the driving column 708 is provided with the compression spring 709. The rotating assembly 7 further comprises a driving sleeve 710, a guide groove 711 and a guide block 712. The top of the reversing pipe 4 is fixed with the driving sleeve 710, and the outer side of the driving sleeve 710 is provided with the guide groove 711. The inside of the guide groove 711 is fixed with the guide block 712. The driving column 708 is slidably connected with the driving sleeve 710 through the guide groove 711, and the guide groove 711 is composed of two groups of vertical grooves and inclined grooves. Specific operation as follows, motor 601 work process will also through the double output shaft reducer 602 and reducer 701 drive cam 702 slowly rotate, while under the action of reducer 701 can also provide a larger torque, so that the cam 702 can push the rubber coated roller 703 up, will be through the side plate 704 drive ring 706 synchronous up, spring seat 707 will be in compression, in the process, drive column 708 will slide along the vertical groove of guide groove 711, avoid fixed tube 3 and reversing tube 4 between the rotation, conducive to maintaining the stability of the monitoring process, at the same time, due to the guide block 712 is inclined, can make the drive column 708 extrusion compression spring 709, and when the rubber coated roller 703 moves to the highest point of cam 702, drive column 708 will just slide to the upper end of guide block 712, at this time the compression spring 709 will drive the drive column 708, so that its bottom and the top of guide block 712 fit, therefore, when the rubber coated roller 703 over the highest point of cam 702, spring seat 707 will be under the limit of guide sleeve 705 drive ring 706 down, at the same time, guide sleeve 705 will also limit the rotation of drive ring 706 through the side plate 704, can make the compression spring 709 in the downward movement, can slide into the inclined groove of guide groove 711, so that the drive sleeve 710 drive reversing tube 4 to rotate clockwise fast half a circle and stop, therefore, in the process of use, without adding additional electric control system, can reach the effect of timing switching, simple structure, conducive to saving cost, and because the whole switching process is very fast, therefore, also will not affect the effect of continuous monitoring of equipment.

[0023] Please refer to Figure 7 and Figure 8 , one side of the guide sleeve 705 is provided with brush assembly 8, brush assembly 8 includes shaft 801, brush plate 802 and torsional spring 803, one side of the guide sleeve 705 is provided with shaft 801, and the end of the shaft 801 is connected with brush plate 802, and one side of the upper end of the brush plate 802 is fixed with torsional spring 803, brush assembly 8 further includes fixed sleeve 804, guide strip 805 and fixed column 806, the middle of the brush plate 802 is fixed with fixed sleeve 804, and the upper and lower ends of one side of the fixed sleeve 804 are provided with guide strip 805, the bottom of the guide strip 805 is slidably connected with fixed column 806, and the fixed column 806 is fixedly connected with the side plate 704; The specific operation is as follows: during the rotation switching of the reversing pipe 4, the side of the filter 5 is in contact with the bottom of the brush plate 802, so that the side of the filter 5 is brushed and cleaned, and the dust and impurities attached to the surface of the filter 5 are swept off. When the side plate 704 moves upward, the fixed column 806 moves synchronously. When the fixed column 806 is in contact with the guide strip 805, the brush plate 802 is rotated around the rotating shaft 801 under the guidance of the inclined surface of the guide strip 805, so that the side of the filter 5 is swept and cleaned. When the brush plate 802 is separated from the guide strip 805, the torsional spring 803 drives the brush plate 802 to rotate and reset, and the side of the filter 5 is cleaned again. Therefore, during the back blowing and cleaning of the filter 5, the brush plate 802 automatically sweeps and cleans the side of the filter 5, further improving the cleaning effect of the filter 5.

[0024] In summary, the fixed-pollution-source carbon emission continuous monitoring device, in use, first, the motor 601 drives the sliding seat 604 to reciprocate through the double-output-shaft speed reducer 602 and the reciprocating lead screw 603, so that the piston rod 605 slides in the inside of the case 1, thereby changing the air pressure at one end of the inside of the case 1, and when the air pressure decreases, the outside to-be-measured gas can be sucked into the inside of the case 1 through the first one-way valve 606, at this time, the carbon dioxide sensor probe on the monitor main body 2 can be used to monitor the carbon content of the air, and when the air pressure increases, the air can flow from the second one-way valve 607 at the bottom to another flow passage of the fixed pipe 3, and then be sprayed out from the air injection hole 608 to blow and clean the filter 5, so that another disabled filter 5 can be cleaned and maintained at the same time in the monitoring process, secondly, when the motor 601 works, the cam 702 can be slowly rotated through the double-output-shaft speed reducer 602 and the speed reducer 701, so that the cam 702 can push the rubber-coated roller 703 to move upwards, the driving ring 706 can be synchronously moved upwards through the side plate 704 in this process, the driving column 708 can slide along the vertical groove of the guide groove 711 to avoid the rotation between the fixed pipe 3 and the reversing pipe 4, then, when the side plate 704 moves upwards, the fixed column 806 can be synchronously moved, and when the fixed column 806 contacts with the guide strip 805, the brush plate 802 can be rotated around the rotating shaft 801 under the guidance of the inclined surface of the guide strip 805, so that the side of the filter 5 can be swept and cleaned, when the brush plate 802 is separated from the guide strip 805, the torsional spring 803 can rotate the brush plate 802 to reset, and the side of the filter 5 can be cleaned again, then, in the process that the driving column 708 moves upwards, the driving column 708 can extrude and compress the compression spring 709 due to the inclined guide block 712, and when the rubber-coated roller 703 moves to the highest point of the cam 702, the driving column 708 just slides to the upper end of the guide block 712, at this time, the compression spring 709 can push the driving column 708 to make the bottom of the driving column 708 fit the top of the guide block 712, finally, when the rubber-coated roller 703 passes the highest point of the cam 702, the spring seat 707 can push the driving ring 706 to move downwards under the limitation of the guide sleeve 705, and the guide sleeve 705 can limit the rotation of the driving ring 706 through the side plate 704, so that the compression spring 709 can slide into the inclined groove of the guide groove 711 when moving downwards, the driving sleeve 710 can drive the reversing pipe 4 to rotate clockwise at a high speed for half a circle and then stop, therefore, in the use process, no additional electric control system is needed to achieve the effect of timing switching.

[0025] The embodiments of the present application are presented by way of example and description, and are not intended to be exhaustive or to limit the application to the form disclosed. Many modifications and variations will be apparent to those skilled in the art. Embodiments are chosen and described in order to best explain the principles of the application and its practical application, and to thereby enable others skilled in the art to best utilize the application in various embodiments and with various modifications as are suited to the particular use contemplated.

Claims

1. A continuous monitoring device for carbon emissions from a stationary source, characterized in that, The utility model provides a kind of air injection device, including cabinet (1) and drive assembly (6), the one side of the cabinet (1) is fixed with monitor body (2), and the bottom of cabinet (1) is placed with fixed pipe (3), the lower end outside of the fixed pipe (3) is rotatably connected with reversing pipe (4), and the inside of both ends of reversing pipe (4) is placed with filter (5), the drive assembly (6) is placed in the top of fixed pipe (3), the drive assembly (6) includes motor (601), double-output shaft speed reducer (602), reciprocating screw (603), sliding seat (604), piston rod (605), first check valve (606), second check valve (607) and air injection hole (608), the top of the cabinet (1) is fixed with motor (601), and one end of motor (601) is placed with double-output shaft speed reducer (602), the end of double-output shaft speed reducer (602) is connected with reciprocating screw (603), and the outside of reciprocating screw (603) is provided with sliding seat (604), the lower end one side of sliding seat (604) is fixed with piston rod (605), the inside of the cabinet (1) is placed with first check valve (606) in central symmetry, and the bottom of cabinet (1) is fixed with second check valve (607) in symmetry, the second check valve (607) is connected with the inside of fixed pipe (3) by pipeline, and the lower end one side of fixed pipe (3) is provided with air injection hole (608).

2. The device according to claim 1, wherein, The inside of the fixed pipe (3) is provided with two flow channels, and the fixed pipe (3) is connected with the inside of one end of the cabinet (1) by pipeline.

3. The device according to claim 1, wherein, The top of the reversing pipe (4) is provided with a rotating assembly (7), and the rotating assembly (7) includes a speed reducer (701), a cam (702), and a rubber roller (703). The top of the double-output shaft speed reducer (602) is connected with the speed reducer (701), and the output shaft of the speed reducer (701) is fixed with the cam (702). The top of the cam (702) is provided with the rubber roller (703).

4. The device according to claim 3, wherein, The rotating assembly (7) further includes a side plate (704), a guide sleeve (705), and a drive ring (706). The two ends of the rubber roller (703) are fixed with the side plate (704), and the outside of the side plate (704) is sleeved with the guide sleeve (705). The bottom of the side plate (704) is connected with the drive ring (706).

5. The device according to claim 4, wherein, The guide sleeve (705) is fixedly connected with the cabinet (1), and the cabinet (1) is slidably connected with the piston rod (605).

6. The device according to claim 4, wherein, The rotating assembly (7) further includes a spring seat (707), a drive column (708), and a compression spring (709). The top of the drive ring (706) is symmetrically provided with the spring seat (707) at both ends, and the inside of one end of the drive ring (706) is slidably connected with the drive column (708). The outside of one end of the drive column (708) is provided with the compression spring (709).

7. The device according to claim 6, wherein, The rotating assembly (7) further comprises a driving sleeve (710), a guide groove (711) and a guide block (712), the top of the reversing pipe (4) is fixed with the driving sleeve (710), the outer side of the driving sleeve (710) is provided with the guide groove (711), and the inside of the guide groove (711) is fixed with the guide block (712).

8. The device according to claim 7, wherein, The driving column (708) is slidably connected with the driving sleeve (710) through the guide groove (711), and the guide groove (711) is composed of two groups of vertical grooves and inclined grooves.

9. The device according to claim 4, wherein, One side of the guide sleeve (705) is provided with a brushing assembly (8), the brushing assembly (8) comprises a rotating shaft (801), a brush plate (802) and a torsional spring (803), one side of the guide sleeve (705) is arranged with the rotating shaft (801), the end of the rotating shaft (801) is connected with the brush plate (802), and one side of the upper end of the brush plate (802) is fixed with the torsional spring (803).

10. The device according to claim 9, wherein, The brushing assembly (8) further comprises a fixing sleeve (804), a guide strip (805) and a fixing column (806), the middle of the brush plate (802) is fixed with the fixing sleeve (804), the upper and lower ends of one side of the fixing sleeve (804) are both provided with the guide strip (805), the bottom of the guide strip (805) is slidably connected with the fixing column (806), and the fixing column (806) is fixedly connected with the side plate (704).

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