Sealing structure and discharge device for negative pressure state and operation method thereof

Abstract

The present invention discloses a sealing structure and a discharging device for negative pressure state and an operation method thereof, comprising a sealing seat, which is used to be installed at an output port of a negative pressure device by the sealing seat; a support rod is provided below the sealing seat; a universal ball unit is provided on the support rod, which is used to be swung on the support rod by the universal ball unit; a sealing plate is fixed on the universal ball unit, the upper end of the sealing plate is arc-shaped, a limiting groove is provided on the sealing seat, a sealing ring is provided on the outer edge of the sealing plate, the device transports materials in stages through a feed port, a spacer port and a discharge port, blocks the feed port and the spacer port by two sealing structures, drives the support rod to move by a crank mechanism, and acts on the crank mechanism by a cam mechanism to realize opening or closing of the sealing structure, in the hope of solving the problem that the sealing performance of the existing unloading equipment is significantly reduced and the discharge stability is poor after long-term use.

Description

Technical Field

[0001] The invention relates to a configuration device for a negative pressure production environment, and in particular to a sealing structure and a discharge device for a negative pressure state and an operation method thereof. Background Art

[0002] With the development of the times, existing industrial construction requires recycling waste materials as much as possible to reduce air pollution while ensuring the safety of workers. Therefore, it is often seen that equipment using fans to form negative pressure passages is used in production to ensure that the production environment is relatively independent, thereby reducing the impact on the external environment.

[0003] For example, coal-fired boilers are operated at negative pressure to prevent high-temperature flue gas from spraying out of the furnace, ensuring the safety of operators and reducing the risk of equipment damage. For example, dust collectors use fans to drive dust-laden gas into the dust chamber and are filtered by filter bags, and the dust is sent to the collection hopper. Due to the effect of the fan, the collection hopper is also under negative pressure; if the material is discharged directly, it is easy to inhale the outside airflow, thus affecting the normal operation of the equipment; therefore, on negative pressure equipment, star-shaped dischargers are commonly used as special discharge equipment, which can play a partition role on the one hand, and can send the material at the discharge point out when necessary on the other hand.

[0004] Existing unloading devices often have friction during unloading, so leakage and air leakage are prone to occur during long-term use, and the accumulated materials are easy to affect the motor. If the material is sticky, it will also have a great impact on the discharge, thereby increasing maintenance costs. Summary of the invention

[0005] The object of the present invention is to provide a sealing structure and a discharge device for negative pressure state and an operating method thereof, in order to solve the problem that the sealing performance of the existing unloading equipment is significantly reduced and the discharge stability is poor after long-term use.

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

[0007] A sealing structure for negative pressure state, including a sealing seat, which is used to be installed on the output port of negative pressure equipment by the sealing seat, a support rod is provided below the sealing seat, a universal ball unit is provided on the support rod, and the universal ball unit is used to swing on the support rod, a sealing plate is fixed on the universal ball unit, the upper end of the sealing plate is arc-shaped, and a limiting groove is provided on the sealing seat, a sealing ring is provided between the limiting groove and the sealing plate, the sealing ring is located above the outer edge of the sealing plate, the sealing ring corresponds to the limiting groove, and is used for the support rod to move up and down to drive the sealing plate to contact the sealing seat.

[0008] Preferably, both ends of the support rod are provided with limit seats, and there is a gap between the limit seat and the lower end of the sealing plate.

[0009] Preferably, the sealing seat is provided with a plurality of mounting holes, the sealing plate is provided with fixing grooves corresponding to the mounting holes, the mounting holes and the fixing grooves are provided with clamping rings, a silicone tension rope is provided between the sealing plate and the sealing seat, and both ends of the silicone tension rope have spherical supporting points, and the spherical supporting points are fixed in the clamping rings, so as to provide guiding effect by the silicone tension rope.

[0010] The present invention also provides a discharging device for a negative pressure state, comprising a box body, wherein the upper and lower ends of the box body are respectively provided with a feed port and a discharge port, a partition port is provided in the middle of the box body, and the feed port and the partition port are equipped with the above-mentioned sealing structure; a crank mechanism is provided on one side of the feed port and the partition port, the crank mechanism is connected to the support rod of the sealing structure, and a cam mechanism is provided on one side of the box body, which is used to contact different crank mechanisms during the rotation of the cam mechanism, and is used to drive the support rod to move downward by the crank mechanism.

[0011] Preferably, the crank mechanism includes a main shaft, on which a support rod and a rocker arm are respectively provided, the support rod is connected to the support rod, and the rocker arm is provided with a counterweight, so that the rocker arm contacts the cam mechanism and drives the main shaft to rotate, and the support rod rotates to drive the support rod to move downward and open the sealing structure of the feed port or the spacing port.

[0012] A further technical solution is that the cam mechanism comprises a driving motor and a reducer, the reducer is connected to the driving motor via a coupling, and a cam is mounted on the output shaft of the reducer for respectively pushing the rocker arms of the two crank mechanisms by the rotation of the cam.

[0013] A further technical solution is that a rotating wheel is provided on the rocker arm, so as to contact the cam through the rotating wheel.

[0014] A further technical solution is that the side wall of the box body is provided with a plurality of observation ports, the observation ports are sealed with tempered glass, and the outer wall of the observation port is provided with a sealing lock.

[0015] The present invention also discloses an operation method of a discharge device for a negative pressure state, using the above-mentioned discharge device for a negative pressure state, comprising the following steps:

[0016] Physical device testing is to continuously supply air or test materials to the feed inlet to form a testing environment, start the cam mechanism to work with the crank mechanism to observe whether the sealing structure works normally, and determine whether the device installation is sealed based on the material.

[0017] Delay test, control the cam mechanism to run at a uniform speed, record the working time of the sealing structure of the feed port, record the working time of the sealing structure of the spacing port, so as to obtain the time ratio of each part of one cycle of the cam mechanism.

[0018] Equipment installation: install the discharge device at the output port of the negative pressure equipment's straight discharge pipe, and connect its cam mechanism to the computer control system, which controls the operation of the cam mechanism.

[0019] The delay time is set by starting the cam mechanism through the computer, and the cam mechanism is controlled by the computer to stop temporarily, so as to increase the delay protection from the complete closure of the sealing structure of the feed port to the opening of the sealing structure of the interval port; the delay time is matched with the production line, and production can start after completion.

[0020] Compared with the prior art, the beneficial effects of the present invention are at least one of the following:

[0021] The present invention drives the sealing plate to contact / release with the sealing seat by moving the support rod up and down, and uses the universal ball unit to enable the sealing plate to shake by itself to obtain self-adjustment capability. The sealing ring is deformed after being squeezed and fills the gap between the sealing plate and the sealing seat, effectively ensuring the sealing between the sealing plate and the sealing seat. The limiting seat is provided to prevent the sealing plate from shaking excessively, ensuring that the adjustment capability does not affect the overall sealing, and facilitating the replacement of the sealing ring.

[0022] The device of the present invention conveys materials in stages through a feed port, a spacing port and a discharge port, blocks the feed port and the spacing port with two sealing structures, drives the support rod to move through a crank mechanism, and acts on the crank mechanism through a cam mechanism to realize opening or closing of the sealing structure.

[0023] The crank mechanism of the present invention drives the main shaft to rotate through the rocker arm, and drives the support rod through the main shaft to act on the support rod, so that the support rod can move up and down, and the crank mechanism drives the support rod to move up through the counterweight to close the sealing structure, and the cam mechanism drives the crank mechanism to move the support rod down to open the sealing structure.

[0024] The cam mechanism of the present invention adopts a driving motor to provide power, and the cam speed is adjusted through a reducer. The cam rotates to contact the rocker arms of the crank mechanism respectively, so as to act on the support rod through the crank mechanism.

[0025] The present invention ensures smooth contact by contacting the cam with the rotating wheel, avoids misalignment between the rocker arm and the cam due to friction, and causes equipment failure. The material conveying situation is observed through the observation port, the internal environment of the box is relatively sealed by the tempered glass, and the observation port can be closed by the sealing lock in the non-observation state.

[0026] The method adopted by the present invention can make the device adapt to the automated production line and improve the working efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the sealing structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the installation of the sealing ring of the present invention.

[0029] Figure 3 It is a schematic diagram of the structure of the discharging device of the present invention.

[0030] Figure 4 It is a schematic diagram of the power structure of the present invention.

[0031] Figure 5 A schematic diagram of an embodiment of the present invention.

[0032] Figure 6 for Figure 5 A partial enlarged schematic diagram of .

[0033] Description of reference numerals:

[0034] 1-sealing seat, 2-support rod, 3-universal ball unit, 4-sealing plate, 5-limiting groove, 6-sealing ring, 7-limiting seat, 8-box, 9-feeding port, 10-discharging port, 11-spacer, 12-crank mechanism, 13-cam mechanism, 14-spindle, 15-support rod, 16-rocker arm, 17-counterweight, 18-reducer, 19-cam, 20-rotor, 21-observation port, 22-sealing lock, 23-mounting hole, 24-fixing groove, 25-clamping ring, 26-silicone tension rope, 27-spherical support point. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] Embodiment 1:

[0037] refer to Figure 1 , Figure 2 As shown, one embodiment of the present invention is a sealing structure for a negative pressure state, comprising a sealing seat 1, which is used to be installed at the output port of a negative pressure device, wherein mounting holes are provided at both ends of the sealing seat 1, and bolts are installed through the mounting holes, so that a locking bolt installation method can be adopted to improve the disassembly / installation efficiency and facilitate maintenance or replacement.

[0038] A support rod 2 is provided below the sealing seat 1, that is, the support rod 2 is located below the output port of the negative pressure device, and a universal ball unit 3 is provided on the support rod 2, which is used for the universal ball unit 3 to swing on the support rod 2, and a sealing plate 4 is fixed on the universal ball unit 3, wherein the universal ball unit 3 is an existing product, such as a bull's eye wheel commonly known in the industry, and a bull's eye wheel with a flange edge can be selected; a connecting flange adapted to the universal ball unit 3 is provided at the upper end of the support rod 2, so as to facilitate the installation of the fixed end of the universal ball unit 3 on the support rod 2. The sealing plate 4 is installed on the movable ball of the universal ball unit 3 by welding or other fixing methods, so that the sealing plate 4 can swing relatively freely on the universal ball unit 3.

[0039] The upper end of the sealing plate 4 is arc-shaped. The arc-shaped structure can prevent materials from piling up on the upper end of the sealing plate 4, which is beneficial to dumping materials. The materials on the sealing plate 4 are not easy to pile up and arch, so that the materials are distributed and fall according to a predetermined trajectory. The sealing seat 1 is provided with a limiting groove 5, and a sealing ring 6 is provided between the limiting groove 5 and the sealing plate 4. The sealing ring 6 is located above the outer edge of the sealing plate 4. The sealing ring 6 corresponds to the limiting groove 5 and is used to drive the sealing plate 4 to contact the sealing seat 1 by the support rod 2 moving up and down. The installation method of the sealing ring 6 can be various:

[0040] For example, the sealing ring 6 is directly installed in the limiting groove 5, and sealing is achieved by the sealing plate 4 contacting the sealing ring 6. It should be noted that the sealing seat 1 is installed with locking bolts so that the sealing seat 1 can be disassembled, thereby facilitating the replacement of the sealing ring 6.

[0041] For example, a sealing ring 6 is installed on the outer edge of the sealing plate 4, and the sealing ring 6 is located on the sealing plate 4, and the sealing ring 6 is inserted into the limiting groove 5 to achieve sealing; the limiting groove 5 is an annular groove, and the shape of the upper end of the sealing ring 6 is adapted to the limiting groove 5; the sealing seat 1 is moved upward to insert the sealing ring 6 into the limiting groove 5 to achieve sealing, thereby reducing the risk of material leakage; specifically, in order to prevent the limiting groove 5 from accumulating material, the limiting groove 5 can adopt a trapezoidal structure, and when the sealing ring 6 extends into the limiting groove 5, the accidentally attached material can be squeezed out of the limiting groove 5 as much as possible, thereby ensuring the sealing.

[0042] Furthermore, since excessive shaking of the sealing plate 4 is not conducive to the sealing of the sealing ring 6, in order to ensure that the shaking range of the sealing ring 6 is controllable when it shakes with the sealing plate 4, limit seats 7 are provided at both ends of the above-mentioned support rod 2, and a gap is provided between the above-mentioned limit seat 7 and the lower end of the sealing plate 4, wherein the limit seat 7 is fixedly mounted on the support rod 2, and the end of the limit seat is L-shaped, so that when the sealing plate 4 shakes, the lower end of the sealing plate 4 contacts the limit seat 7 to limit the shaking range; therefore, by selecting a gap distance between the limit seat 7 and the lower end of the sealing plate 4, the required shaking range can be adjusted according to design requirements.

[0043] Embodiment 2:

[0044] refer to Figure 5 , Figure 6 As shown, the sealing plate 4 moves in a non-vertical direction relative to the sealing seat 1. In order to ensure that the sealing seat 1 and the sealing plate 4 have good coordinate orientation when resetting, the sealing seat 1 is provided with a plurality of mounting holes 23, and the sealing plate 4 is provided with fixing grooves 24 corresponding to the mounting holes. Both the mounting holes and the fixing grooves are provided with snap rings 25. A silicone tension rope 26 is provided between the sealing plate 4 and the sealing seat 1. Both ends of the silicone tension rope 26 have spherical supporting points 27. The spherical supporting points 27 are fixed in the snap rings 25, and are used for the silicone tension rope 26 to provide a guiding effect.

[0045] The sealing plate 4 is not in a vertical direction during movement and can adjust itself when resetting. If the sealing ring 6 and the limiting groove 5 are deflected and affect the sealing, the silicone tension rope 26 is stretched when the sealing plate 4 is opened, which will not affect the material transportation. A guiding tension is provided when closing, thereby ensuring that the sealing plate 4, the sealing ring 6 and the limiting groove 5 are in a relatively adapted position to prevent the risk of excessive deflection. During the actual installation process, the sealing plate is installed on the mounting hole 23 and the fixing groove 24 by bolts to ensure that the spherical support point 27 will not accidentally fall out.

[0046] Embodiment 3:

[0047] refer to Figure 3 , Figure 4 As shown, another embodiment of the present invention is a discharging device for a negative pressure state, comprising a box body 8, wherein the box body 8 can be an existing product, and has two cavities therein, and a feed port 9 and a discharge port 10 are respectively provided at the upper and lower ends of the box body 8, and a partition port 11 is provided in the middle of the box body 8, that is, the material enters from the feed port 9, then passes through the partition port 11, and is finally discharged from the discharge port 10; the feed port 9 and the partition port 11 are equipped with the above-mentioned sealing structure; the feed port 9 and the partition port 11 are blocked by the sealing mechanism.

[0048] A crank mechanism 12 is provided on one side of the above-mentioned feed port 9 and the spacing port 11. The above-mentioned crank mechanism 12 is connected to the support rod 2 of the sealing structure, and the support rod 2 is driven to move up and down by the crank mechanism 12. A cam mechanism 13 is provided on one side of the above-mentioned box body 8, which is used to contact different crank mechanisms 12 during the rotation of the cam mechanism 13, and is used to drive the support rod 2 to move downward by the crank mechanism 12; specifically, different crank mechanisms 12 are triggered at different times by a cam mechanism 13, thereby ensuring that the feed port 9 and the spacing port 11 are opened and closed, achieving stable output, and preventing external airflow from continuously entering the negative pressure equipment through the feed port 9, affecting the normal operation of the equipment.

[0049] Furthermore, the crank mechanism 12 includes a main shaft 14, on which a support rod 15 and a rocker arm 16 are respectively provided, that is, the main shaft 14 is used to ensure that the support rod 15 and the rocker arm 16 rotate synchronously, the support rod 15 is connected to the support rod 2, and the rocker arm 16 is provided with a counterweight 17, which is used for the rocker arm 16 to contact the cam mechanism 13 and drive the main shaft 14 to rotate, and is used for the support rod 15 to rotate to drive the support rod 2 to move downward and open the sealing structure of the feed port 9 or the partition port 11.

[0050] Specifically, when the cam mechanism 13 acts on the rocker arm 16, the rocker arm 16 is lifted and drives the main shaft 14 to rotate. At this time, the support rod 15 is driven by the main shaft 14 to rotate relatively, so that the support rod 2 is pulled downward by the support rod 15, which makes the support rod 2 move downward and open the gap between the sealing seat 1 and the sealing plate 4. When the cam mechanism 13 does not act on the rocker arm 16, the rocker arm 16 falls naturally under the influence of the counterweight 17, and the main shaft 14 rotates again. At this time, the support rod 15 is still driven by the main shaft 14 to rotate relatively, so that the support rod 2 is pushed upward by the support rod 15, which makes the support rod 2 move upward, so that the sealing plate 4 contacts the sealing seat 1 to form a seal.

[0051] Furthermore, in order to ensure that the cam mechanism 13 stably acts on the crank mechanism 12, the cam mechanism 13 includes a driving motor and a reducer 18. The reducer 18 is connected to the driving motor through a coupling. A cam 19 is installed on the output shaft of the reducer 18, which is used to rotate the cam 19 to push the rocker arms 16 of the two crank mechanisms 12 respectively. The driving motor provides power, and the reducer 18 optimizes the rotation speed of the cam 19 to ensure that the cam can work continuously and stably. The edge of the cam 19 adopts an arc profile to ensure that the cam 19 and the rocker arm 16 apply a stable thrust during the contact process to avoid the rocker arm 16 from falling suddenly due to loss of force.

[0052] Furthermore, the rocker arm 16 is provided with a rotating wheel 20 for contacting the cam 19. The rotating wheel 20 contacts the rocker arm 16, thereby reducing the friction coefficient, which is beneficial to improving the smoothness of the operation of the equipment. It should be noted by those skilled in the art that in order to accurately limit the start and stop timing of the rocker arm 16, a slide groove can be provided on the cam 19, and the slide groove is adapted to the rotating wheel 20, which is rotated by the cam 19 and stably acts on the rotating wheel 20, so as to reduce the risk of the rotating wheel 20 derailing from the cam 19.

[0053] Furthermore, the side wall of the box 8 is provided with a plurality of observation ports 21, which are sealed with tempered glass, and the outer wall of the observation port 21 is provided with a sealing lock 22; wherein there are at least two observation ports 21, which are provided on the outer walls of the two cavities of the box 8, and are sealed with tempered glass to ensure visibility without affecting the normal operation of the equipment. It should be noted that if the number of observation ports 21 is greater than that required for observation, the redundant observation ports 21 do not need to be provided with tempered glass, and are only sealed and closed with the sealing lock 22, and can be opened for subsequent maintenance and cleaning.

[0054] Embodiment 4:

[0055] This embodiment is an operation embodiment of the present invention, an operation method of a discharge device for negative pressure state, using the above-mentioned discharge device for negative pressure state, comprising the following steps:

[0056] Physical device detection is to form a detection environment by continuously supplying air or testing materials to the feed port 9, start the cam mechanism 13 to cooperate with the crank mechanism 12 to observe whether the sealing structure works normally, and determine whether the device installation is sealed according to the material.

[0057] Delay test, control the cam mechanism 13 to run at a constant speed, record the working time of the sealing structure of the feed port 9, and record the time taken for the sealing structure of the feed port 9 to work, so as to obtain the time ratio of each part of one cycle of the cam mechanism 13.

[0058] Specifically, since the connected equipment itself is under negative pressure and the particle size of the material may be different, the material falling speed of the sealing mechanism of the feed port 9 is different during the opening, pause and closing process. Therefore, it is necessary to ensure that the single feeding of the sealing mechanism of the feed port 9 is within a controllable range. Similarly, the single feeding of the sealing mechanism of the interval port 11 also needs to discharge the material inside the box 8 as much as possible, so it is necessary to record the relevant time.

[0059] Specifically, the time T1 taken for the sealing structure of the feed port 9 to be fully opened from opening is recorded; the time T2 taken for the sealing structure of the feed port 9 to be closed from being fully opened is recorded; the time T3 taken for the sealing structure of the feed port 9 to be fully closed from beginning to end is recorded; the time T4 taken for the sealing structure of the feed port 9 to be fully closed to the opening of the sealing structure of the gap port 11 is recorded; the time T5 taken for the sealing structure of the gap port 11 to be fully opened from opening is recorded; the time T6 taken for the sealing structure of the gap port 11 to be closed from being fully opened is recorded; the time T7 taken for the sealing structure of the gap port 11 to be closed from beginning to end to be fully closed is recorded; the time T8 taken for the sealing structure of the gap port 11 to be fully closed to the next opening of the sealing structure of the feed port 9 is recorded; that is, T1 to T8 is the total time for the cam 19 to rotate one circle.

[0060] Equipment installation, the discharge device is installed at the output port of the negative pressure equipment's straight material discharge pipe, and its cam mechanism 13 is connected to the computer control system, and the computer system controls the cam mechanism 13 to work; wherein the computer is an existing computer, and its control program is an existing PLC program, and the time parameters are at least T1 to T8.

[0061] The delay time is set by starting the cam mechanism 13 through a computer, and controlling the cam mechanism 13 to stop temporarily through a computer, so as to increase the delay protection from the complete closure of the sealing structure of the feed port 9 to the opening of the sealing structure of the partition port 11; the delay time is matched with the production line, and production can start after completion.

[0062] The program controls the reducer to shorten the duration of T1 and T3. The duration of T4 can be the voltage stabilization duration and the cam 19 is temporarily stopped at T8 by the computer control to serve as the downtime protection time of the equipment to avoid the long-term operation of the drive motor. The duration of T5 plus T7 needs to be greater than the duration of T1 plus T3, and the duration greater than T3 is not less than 3 seconds to ensure that the spacer 11 can output materials greater than the materials loaded into the feed port 9.

[0063] The "one embodiment", "another embodiment", "embodiment", "preferred embodiment" and the like mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment as included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0064] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and modifications may be made to the components and / or layout of the subject combination layout. In addition to the variations and modifications made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A method for operating a discharge device in a negative pressure state, characterized in that: The negative pressure discharge device comprises a box body (8), wherein the upper and lower ends of the box body (8) are respectively provided with a feed port (9) and a discharge port (10), and a partition port (11) is provided in the middle of the box body (8), wherein the feed port (9) and the partition port (11) are provided with a sealing structure; a crank mechanism (12) is provided on one side of the feed port (9) and the partition port (11), wherein the crank mechanism (12) is connected to a support rod (2) of the sealing structure; and a cam mechanism (13) is provided on one side of the box body (8), wherein the cam mechanism (13) contacts different crank mechanisms (12) during the rotation of the cam mechanism (13), and wherein the crank mechanism (12) drives the support rod (2) to move downward; The sealing structure comprises a sealing seat (1) for being installed at the output port of the negative pressure device by the sealing seat (1); a support rod (2) is provided below the sealing seat (1); a universal ball unit (3) is provided on the support rod (2) for the universal ball unit (3) to swing on the support rod (2); a sealing plate (4) is fixed on the universal ball unit (3); the upper end of the sealing plate (4) is arc-shaped; a limiting groove (5) is provided on the sealing seat (1); a sealing ring (6) is provided between the limiting groove (5) and the sealing plate (4); the sealing ring (6) is located above the outer edge of the sealing plate (4); the sealing ring (6) corresponds to the limiting groove (5) and is used for the support rod (2) to move up and down so as to drive the sealing plate (4) to contact the sealing seat (1); limiting seats (7) are provided at both ends of the support rod (2); a gap is provided between the limiting seat (7) and the lower end of the sealing plate (4); The method comprises the following steps: Step A, physical device testing, by continuously supplying air or testing materials to the feed port (9) to form a testing environment, starting the cam mechanism (13) to cooperate with the crank mechanism (12) to observe whether the sealing structure works normally, and determining whether the device installation is sealed according to the materials; Step B, delay test, control the cam mechanism (13) to run at a constant speed, record the working time of the sealing structure of the feed port (9), and record the working time of the sealing structure of the spacer port (11), so as to obtain the time ratio of each part of one cycle of the cam mechanism (13); Step C, equipment installation, installing the discharge device at the output port of the discharge straight pipe of the negative pressure device, and connecting the cam mechanism (13) thereof to a computer control system, and the computer system controls the operation of the cam mechanism (13); Step D, delay time setting, starting the cam mechanism (13) through a computer, and controlling the cam mechanism (13) through a computer to temporarily stop, so as to increase the delay protection from the complete closure of the sealing structure of the feed port (9) to the opening of the sealing structure of the spacing port (11); the delay time is matched with the production line, and production can be started after completion.

2. The method for operating a discharge device in a negative pressure state according to claim 1, characterized in that: The crank mechanism (12) comprises a main shaft (14), on which a support rod (15) and a rocker arm (16) are respectively provided, wherein the support rod (15) is connected to the support rod (2), and the rocker arm (16) is provided with a counterweight (17) for causing the rocker arm (16) to contact the cam mechanism (13) and drive the main shaft (14) to rotate, and for causing the support rod (15) to rotate and drive the support rod (2) to move downward and open the sealing structure of the feed port (9) or the spacing port (11).

3. The method for operating a discharge device in a negative pressure state according to claim 2, characterized in that: The cam mechanism (13) comprises a drive motor and a reducer (18), wherein the reducer (18) is connected to the drive motor via a coupling, and a cam (19) is mounted on an output shaft of the reducer (18) for respectively driving the rocker arms (16) of the two crank mechanisms (12) by the rotation of the cam (19).

4. The method for operating a discharge device in a negative pressure state according to claim 3, characterized in that: The rocker arm (16) is provided with a rotating wheel (20) for contacting the cam (19) via the rotating wheel (20).

5. The method for operating a discharge device in a negative pressure state according to claim 1, characterized in that: The side wall of the box body (8) is provided with a plurality of observation ports (21), the observation ports (21) are sealed with tempered glass, and the outer wall of the observation port (21) is provided with a sealing lock (22).

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