Automatic pressure plate based exhaust and its outfeed

Abstract

This utility model relates to the field of pressure plate venting technology, and more particularly to an automatic venting device and its discharge machine based on a pressure plate. The venting device is installed on the pressure plate and includes: a valve stem, a valve seat, and a spring. The valve stem passes through the pressure plate, with a pressure plate on the side of the valve stem near the vessel body and a pressure cap on the side of the valve stem away from the vessel body. The valve seat is sleeved on the outside of the valve stem and passes through the pressure plate, with the valve stem and valve seat slidably connected. The spring is sleeved on the outside of the valve stem, with both ends of the spring connected to the pressure cap and the valve seat, respectively. The spring is used to adjust the position of the valve stem relative to the valve seat, so that the venting device can switch back and forth between a venting state and a closed state. This utility model uses the extension and retraction of the spring to adjust the position of the valve stem relative to the valve seat, thereby realizing the switching of the entire venting device between a venting state and a closed state, so as to realize the automatic discharge of air from the vessel body, and automatically close after discharge, thereby improving venting efficiency.

Description

Technical Field

[0001] This utility model relates to the field of pressure plate exhaust technology, and in particular to an automatic exhaust device based on a pressure plate and its discharge machine. Background Technology

[0002] When the pressure plate enters the container (e.g., the vessel body), there is a certain gap between the bottom of the pressure plate and the material stored inside the container. At this time, the container is in a sealed state. If an exhaust device (mostly used on discharge machines in the chemical industry) is not installed on the pressure plate to expel the air in this gap, this air will be forced into the material as the pressure plate presses down. This will cause the following problems:

[0003] 1. This air will mix into the material and affect its properties;

[0004] 2. If the material contains air, the discharge will be intermittent and there will be a spraying phenomenon, which is quite dangerous and affects the stability of the material discharge.

[0005] Currently, the commonly used pressure plate venting device is the valve-type venting, which involves drilling holes in the pressure plate and equipping it with a manual or pneumatic ball valve. When venting is required, the ball valve is opened first, and the pressure plate enters the vessel and continues to press down to begin venting. When material leakage is observed from the venting port, the ball valve is closed to complete the venting. After the material discharge is completed, the ball valve needs to be opened again when the pressure plate rises. This operation requires manual operation of the ball valve for venting, which is prone to observation and operation errors, leading to excessive material leakage. In addition, on some large equipment, there is not enough space and angle for observation, and it is often necessary to use structures such as reflectors for observation, which increases costs, makes the operation very cumbersome, and results in low venting efficiency. Utility Model Content

[0006] To address the shortcomings of the existing production technology, the applicant provides an automatic exhaust device and its discharge machine based on a pressure plate. By improving the structure of the exhaust device, it can automatically discharge air from the reactor and automatically shut off after exhaust, thereby preventing leakage of materials from the reactor, reducing production costs, and improving exhaust efficiency.

[0007] The technical solution adopted in this utility model is as follows:

[0008] An automatic venting device based on a pressure plate is disclosed. The venting device is mounted on the pressure plate and includes a valve stem, a valve seat, and a spring. The valve stem passes through the pressure plate, and a pressure plate is provided on the side of the valve stem near the vessel body. A pressure cap is provided on the side of the valve stem away from the vessel body. The valve seat is sleeved on the outside of the valve stem and passes through the pressure plate. The valve stem and the valve seat are slidably connected. The spring is sleeved on the outside of the valve stem, and both ends of the spring are connected to the pressure cap and the valve seat, respectively. The spring is used to adjust the position of the valve stem relative to the valve seat, so that the venting device switches back and forth between a venting state and a closed state. Specifically: when the spring is in a compressed state, the venting device is in a venting state, and air between the pressure plate and the vessel body is discharged through the venting device; when the spring is in a normal state, the venting device is in a closed state.

[0009] Therefore, by extending and retracting the spring, the position of the valve stem relative to the valve seat is adjusted, thereby enabling the entire exhaust device to switch back and forth between the exhaust state and the closed state. Compared with the existing method of manually operating the exhaust using a manual ball valve or a pneumatic ball valve, this method has a simple structure and is easy to operate. The spring enables the automatic discharge of air from the reactor body, and the device automatically closes after discharge to avoid leakage of materials from the reactor body, reduce production costs, and improve exhaust efficiency.

[0010] As a further improvement to the above technical solution: the gland has a first through hole along the axial direction of the valve stem. This first through hole ensures that air can be discharged through the gland.

[0011] As a further improvement to the above technical solution, a first sealing ring is embedded on the outer circumferential surface of the pressure plate. This first sealing ring ensures a tight connection between the pressure plate and the base, guaranteeing that when the entire exhaust device is closed, the material inside the vessel will not leak out through the exhaust device.

[0012] As a further improvement to the above technical solution, it also includes: a base, the base being located on the side of the pressure plate near the vessel body, and the side of the valve seat near the vessel body being connected to the pressure plate via the base; a second sealing ring is installed between the base and the valve seat, and the second sealing ring is embedded in the inner wall of the base; wherein: when the spring is in its normal state, the side of the pressure plate near the pressure plate abuts against the side of the base near the pressure plate, the outer circumferential surface of the pressure plate abuts against the inner wall of the base, and the exhaust device is in a closed state. Thus, the second sealing ring can seal the base and the valve seat.

[0013] As a further improvement to the above technical solution, it also includes: a guide sleeve, which is located between the valve stem and the valve seat, with the outer side of the guide sleeve connected to the inner wall of the valve seat and the inner side of the guide sleeve abutting against the outer wall of the valve stem; two guide sleeves are provided, each located at one end of the valve stem. Thus, by installing the guide sleeves between the valve stem and the valve seat, on the one hand, it can be ensured that the valve stem can only move relative to the valve seat in the axial direction, while remaining relatively stable in the radial direction, preventing relative movement; on the other hand, it can effectively support the valve stem and the valve seat; the two guide sleeves can support the valve stem and the valve seat from both ends of the valve stem, thereby further improving the stability of the valve stem.

[0014] As a further improvement to the above technical solution: one end of the guide sleeve is connected to the valve seat via a stepped portion, and the other end of the guide sleeve is connected to the valve seat via a perforated elastic retaining ring; a second through hole is formed on the outer circumferential surface of the guide sleeve along the axial direction of the valve stem. Thus, through the cooperation of the stepped portion and the perforated elastic retaining ring, it can be ensured that when the valve stem moves axially relative to the valve seat, the guide sleeve will not move relative to the valve seat; the perforated elastic retaining ring ensures air flow to facilitate air discharge from the vessel; and the second through hole ensures air is discharged through the guide sleeve.

[0015] As a further improvement to the above technical solution: there is a gap between the valve seat and the valve stem, and a gap between the base and the valve stem. Therefore, the gaps between the valve seat and the valve stem, and between the base and the valve stem, ensure the discharge of air from the vessel body.

[0016] As a further improvement to the above technical solution, it also includes: a first flange, which is located on the side of the pressure plate away from the vessel body, with one end of the first flange abutting against the pressure cap, and the other end of the first flange connected to the valve seat, and a flange gasket installed between the first flange and the valve seat. Thus, the flange gasket is used for sealing between the first flange and the valve seat.

[0017] As a further improvement to the above technical solution: an adjusting shim is installed between the valve stem and the pressure plate. Therefore, the adjusting shim is used to adjust the gap between the side of the valve stem closest to the vessel body and the side of the pressure plate closest to the vessel body.

[0018] A material discharge machine includes: an automatic venting device based on a pressure plate, a pressure plate, and a container body. The automatic venting device based on the pressure plate is installed on the pressure plate, and the container body is located on the side of the pressure plate near the pressure plate and is connected to the pressure plate. The container body is used to store materials.

[0019] The beneficial effects of this utility model are as follows:

[0020] The position of the valve stem relative to the valve seat is adjusted by the extension and retraction of the spring, thereby enabling the entire exhaust device to switch back and forth between the exhaust state and the closed state. Compared with the existing method of manually operating the exhaust using a manual ball valve or a pneumatic ball valve, this method has a simple structure and is easy to operate. The spring enables the automatic discharge of air from the reactor body and automatically closes the valve after discharge to avoid leakage of materials from the reactor body, reduce production costs, and improve exhaust efficiency.

[0021] This utility model also has the following advantages:

[0022] 1. This utility model ensures a tight connection between the pressure plate and the base through the first sealing ring, so that the material inside the vessel will not leak out through the exhaust device when the entire exhaust device is in the closed state.

[0023] 2. This utility model, by installing guide sleeves between the valve stem and the valve seat, ensures that the valve stem can only move relative to the valve seat in the axial direction, while remaining relatively stable in the radial direction and preventing relative movement. On the other hand, it effectively supports the valve stem and the valve seat. The two guide sleeves can support the valve stem and the valve seat from both ends of the valve stem, thus further improving the stability of the valve stem.

[0024] 3. This utility model, through the cooperation of the stepped part and the elastic retaining ring for the hole, can ensure that when the valve stem moves relative to the valve seat in the axial direction, the guide sleeve will not move relative to the valve seat; the elastic retaining ring for the hole can ensure air flow to realize the discharge of air in the vessel body; the second through hole can ensure that air is discharged through the guide sleeve. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the automatic exhaust device based on a pressure plate according to this utility model.

[0026] Figure 2 For the present utility model Figure 1 Enlarged schematic diagram of a local structure at point A;

[0027] Figure 3 For the present utility model Figure 1 Enlarged schematic diagram of the local structure at point B;

[0028] Figure 4 This is a schematic diagram of the valve stem structure of this utility model;

[0029] Figure 5 This is a schematic diagram of the valve seat structure of this utility model;

[0030] Figure 6 This is a schematic diagram of the guide sleeve of this utility model;

[0031] Figure 7 This is a schematic diagram of the installation structure of the valve stem, the elastic retaining ring for the hole, and the guide sleeve of this utility model;

[0032] Figure 8 This is a schematic diagram of the material discharge machine of this utility model.

[0033] Among them: 1. Pressure plate;

[0034] 2. Valve stem;

[0035] 201. Pressure plate; 202. Pressure cap; 203. First through hole; 204. First sealing ring; 205. Adjusting shim; 206. Connector;

[0036] 3. Valve seat;

[0037] 301. Stepped section; 302. Hole retaining ring; 303. Second flange; 304. Circular pipe; 305. Third flange;

[0038] 4. Spring;

[0039] 5. Kettle body;

[0040] 6. Base;

[0041] 601. Second sealing ring;

[0042] 7. Guide sleeve;

[0043] 701, Second through hole;

[0044] 8. First flange;

[0045] 801. Flange gasket. Detailed Implementation

[0046] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0047] like Figures 1 to 8As shown, an automatic venting device based on a pressure plate is disclosed. The venting device is mounted on the pressure plate 1 and includes a valve stem 2, a valve seat 3, and a spring 4. The valve stem 2 passes through the pressure plate 1. A pressure plate 201 is provided on the side of the valve stem 2 near the vessel body 5, and a pressure cap 202 is provided on the side of the valve stem 2 away from the vessel body 5. The valve seat 3 is sleeved on the outside of the valve stem 2 and passes through the pressure plate 1. The valve stem 2 and the valve seat 3 are slidably connected. The spring 4 is sleeved on the outside of the valve stem 2, and both ends of the spring 4 are connected to the pressure cap 202 and the valve seat 3, respectively. The spring 4 is used to adjust the position of the valve stem 2 relative to the valve seat 3 so that the venting device can switch back and forth between the venting state and the closed state. Specifically, when the spring 4 is in the compressed state, the venting device is in the venting state, and the air between the pressure plate 1 and the vessel body 5 is discharged through the venting device. When the spring 4 is in the normal state, the venting device is in the closed state. Therefore, by extending and retracting the spring 4, the position of the valve stem 2 relative to the valve seat 3 is adjusted, thereby enabling the entire exhaust device to switch back and forth between the exhaust state and the closed state. Compared with the existing method of manually operating the exhaust using a manual ball valve or a pneumatic ball valve, this method has a simple structure and is easy to operate. The spring 4 enables the automatic discharge of air from the vessel body 5 and automatically closes the vessel body after discharge to avoid leakage of materials from the vessel body 5, reduce production costs, and improve exhaust efficiency.

[0048] It should be noted that the spring 4 in this solution not only enables automatic venting and closure, but also avoids the risk of leakage of low-viscosity materials through the entire venting device. This is because, when the entire venting device moves from the venting state to the closed state, the valve stem 2 is subjected to the thrust of the spring 4 from the compressed state to the normal state, as well as the thrust of the material pushing the valve stem 2 away from the vessel body 5 after contact with the pressure plate 201. Under the action of the dual thrust, the valve stem 2 is pushed away from the vessel body 5. This dual thrust can avoid the risk that the thrust of the low-viscosity material on the valve stem 2 is too small to independently push the valve stem 2 away from the vessel body 5. Thus, the entire venting device can be closed even in the environment of low-viscosity materials, and there is no risk of leakage of low-viscosity materials.

[0049] Specifically, the valve stem 2 and the gland 202 are connected by bolts.

[0050] Specifically, such as Figure 4 As shown, a connector 206 is provided on the side of the valve stem 2 away from the pressure plate 201, and the connector 206 is connected to the pressure cover 202 by bolts.

[0051] In this embodiment, the pressure cap 202 has a first through hole 203 along the axial direction of the valve stem 2; an adjusting shim 205 is installed between the valve stem 2 and the pressure cap 202. Thus, the first through hole 203 ensures that air can be discharged through the pressure cap 202; the adjusting shim 205 is used to adjust the gap between the side of the valve stem 2 near the vessel body 5 and the side of the pressure plate 1 near the vessel body 5.

[0052] In this embodiment, a first sealing ring 204 is embedded on the outer peripheral surface of the pressure plate 201. Thus, the first sealing ring 204 ensures a tight connection between the pressure plate 201 and the base 6, ensuring that the material inside the vessel 5 will not leak out through the exhaust device when the entire exhaust device is in the closed state.

[0053] In this embodiment, the system further includes a base 6, located on the side of the pressure plate 1 near the vessel body 5. The valve seat 3, on the side near the vessel body 5, is connected to the pressure plate 1 via the base 6. A second sealing ring 601 is installed between the base 6 and the valve seat 3, and the second sealing ring 601 is embedded in the inner wall of the base 6. When the spring 4 is in its normal state, the side of the pressure plate 201 near the pressure plate 1 abuts against the side of the base 6 near the pressure plate 201, and the outer circumferential surface of the pressure plate 201 abuts against the inner wall of the base 6, thus the exhaust device is in a closed state. Therefore, the second sealing ring 601 can seal the base 6 and the valve seat 3.

[0054] Specifically, the pressure plate 1 and the base 6 are installed by welding, and the valve seat 3 is connected to the base 6 by bolts.

[0055] In this embodiment, it also includes: a guide sleeve 7, which is located between the valve stem 2 and the valve seat 3, and the outer side of the guide sleeve 7 is connected to the inner wall of the valve seat 3, and the inner side of the guide sleeve 7 abuts against the outer wall of the valve stem 2; two guide sleeves 7 are provided, and the two guide sleeves 7 are located at both ends of the valve stem 2 respectively; one end of the guide sleeve 7 is connected to the valve seat 3 through the stepped portion 301, and the other end of the guide sleeve 7 is connected to the valve seat 3 through the perforated elastic retaining ring 302; a second through hole 701 is opened on the outer peripheral surface of the guide sleeve 7 along the axial direction of the valve stem 2. Therefore, by installing guide sleeves 7 between valve stem 2 and valve seat 3, on the one hand, it can be ensured that valve stem 2 can only move relative to valve seat 3 in the axial direction, while remaining relatively stable in the radial direction and not moving relative to valve seat 3. On the other hand, it can effectively support valve stem 2 and valve seat 3. The two guide sleeves 7 can support valve stem 2 and valve seat 3 from both ends of valve stem 2, thus further improving the stability of valve stem 2. Through the cooperation between step portion 301 and orifice elastic retaining ring 302, it can be ensured that when valve stem 2 moves relative to valve seat 3 in the axial direction, guide sleeves 7 will not move relative to valve seat 3. Orifice elastic retaining ring 302 can ensure air flow to realize the discharge of air inside vessel body 5. The second through hole can ensure that air is discharged through guide sleeves 7.

[0056] Specifically, such as Figure 6 As shown, the guide sleeve 7 has a plurality of second through holes 701, which are arranged in a ring at equal intervals. Thus, the area of ​​the guide sleeve 7 without the second through holes 701 is used to abut against the inner wall of the valve seat 3, while the area of ​​the guide sleeve 7 with the second through holes 701 is used for gas flow (i.e. for the exhaust operation of the entire exhaust device).

[0057] It should be noted that: 302 refers to an elastic retaining ring with holes (such as...) Figure 7 As shown, the outer side of the elastic retaining ring 302 abuts against the valve assembly 3, and there is a gap between the inner side of the elastic retaining ring 302 and the valve stem 2 (this gap is formed by the hole). Thus, the elastic retaining ring itself is used to install the guide sleeve 7 onto the valve seat 3, and the hole (which is connected to the second through hole 701) is used for the exhaust operation of the entire exhaust device.

[0058] Specifically, such as Figure 5 As shown, the valve seat 3 includes: a second flange 303, a round tube 304, and a third flange 305. The second flange 303, the round tube 304, and the third flange 305 are welded and fixed in sequence. A retaining ring groove is provided inside the round tube 304. The retaining ring groove is used to install the elastic retaining ring 302 of the hole.

[0059] In this embodiment, there is a gap between the valve seat 3 and the valve stem 2, and a gap between the base 6 and the valve stem 2. Therefore, the gaps between the valve seat 3 and the valve stem 2, and between the base 6 and the valve stem 2, ensure the discharge of air from the vessel body 5.

[0060] In this embodiment, a first flange 8 is also included. The first flange 8 is located on the side of the pressure plate 1 away from the vessel body 5, and one end of the first flange 8 abuts against the pressure cap 202, while the other end of the first flange 8 is connected to the valve seat 3. A flange gasket 801 is installed between the first flange 8 and the valve seat 3. Thus, the flange gasket 801 is used for sealing between the first flange 8 and the valve seat 3.

[0061] Specifically, such as Figure 1 , Figure 3 As shown, bolts and nuts are provided on the first flange 8. Through the cooperation of the bolts and nuts, pressure is applied to the first flange 8 to compress the flange gasket 801 so that the flange gasket 801 can play a sealing role.

[0062] The exhaust process of this utility model's automatic exhaust device is as follows: First, in the initial state, the pressure plate 1 has not entered the vessel body 5. At this time, under the action of gravity, the valve stem 2, pressure plate 201, and pressure cover 202 cause the pressure plate 201 to abut against the first flange 8, and the pressure plate 201 is in its lowest position (relative to the lowest position of the pressure plate 1). The spring 4 is in a compressed state under the action of gravity of the valve stem 2, pressure plate 201, and pressure cover 202, and the entire exhaust device is not venting. Then, under the action of the hydraulic system (the drive end of the hydraulic system (not shown in the figure) is installed on the side of the pressure plate 1 away from the vessel body 5), the drive... The moving pressure plate 1 moves towards the side closer to the vessel body 5, entering the vessel body 5 and continuing to move towards the side closer to the vessel body 5 under the action of this force (at this time, the pressure plate 1 is not in contact with the material inside the vessel body 5). Meanwhile, the air between the pressure plate 1 and the vessel body 5 passes sequentially through the gap between the base 6 and the valve stem 2, the gap between the valve seat 3 and the valve stem 2, the hole of the elastic retaining ring 302, the second through hole 701, the gap between the valve seat 3 and the valve stem 2, the second through hole 701, the hole of the elastic retaining ring 302, the gap between the valve seat 3 and the valve stem 2, and the first through hole 2. 03. Upon discharge, the air between the pressure plate 1 and the vessel body 5 is automatically discharged (i.e., natural venting is complete, and the side of the pressure plate 1 closest to the vessel body 5 comes into contact with the material). Then, as the pressure plate 1 continues to move closer to the vessel body 5 (at this time, the pressure plate 1 is in contact with the material), the pressure plate 201 is subjected to the pushing force of the spring 4 and the pushing force of the material pushing the valve rod 2 away from the vessel body 5 after contact with the pressure plate 201. Under the action of these two pushing forces, the valve rod 2 (pressure plate 201, pressure cover 202) is pushed away from the vessel body 5. Once the pressure plate 201 approaches... When one side of the pressure plate 1 abuts against the side of the base 6 near the pressure plate 201 and the outer peripheral surface of the pressure plate 201 abuts against the inner wall of the base 6 (at this time, the outer peripheral surface of the pressure plate 201 and the inner wall of the base 6 are sealed by the second sealing ring 601, and the spring 4 is in normal state), the entire exhaust device switches from the exhaust state to the closed state, which can realize the automatic closing after the air between the pressure plate 1 and the vessel 5 is discharged. As the pressure plate 1 continues to move towards the side closer to the vessel 5, it can continuously press down so that the material in the vessel 5 can be discharged through the side away from the pressure plate 1.Finally, after the material inside the vessel 5 is completely discharged, the pressure plate 1 moves away from the vessel 5 under the action of the hydraulic system. At this time, the vessel 5 is in a vacuum state, and the pressure inside the vessel 5 is less than the pressure outside the vessel 5. Under the combined action of air pressure and the gravity of the valve stem 2, pressure plate 201, and pressure cover 202, the valve stem 2, pressure plate 201, and pressure cover 202 move back towards the vessel 5, recompressing the spring 4, so that the entire exhaust device switches from the closed state to the exhaust state. The air outside the vessel 5 flows into the vessel 5 sequentially through the first through hole 203, the gap between the valve seat 3 and the valve stem 2, the hole of the elastic retaining ring 302, the second through hole 701, the gap between the valve seat 3 and the valve stem 2, the second through hole 701, the hole of the elastic retaining ring 302, the gap between the valve seat 3 and the valve stem 2, and the gap between the base 6 and the valve stem 2. By operating in this way, the automatic exhaust and automatic closing of the entire exhaust device can be achieved.

[0063] like Figure 7 As shown, a discharge machine includes: an automatic exhaust device based on a pressure plate, a pressure plate 1, and a vessel body 5. The automatic exhaust device based on the pressure plate is installed on the pressure plate 1. The vessel body 5 is located on the side of the pressure plate 1 near the pressure plate 201 and is connected to the pressure plate 1. The vessel body 5 is used to store materials.

[0064] In summary, this utility model uses the extension and retraction of the spring 4 to adjust the position of the valve stem 2 relative to the valve seat 3, thereby enabling the entire exhaust device to switch back and forth between the exhaust state and the closed state. Compared with the existing method of manually operating the exhaust using a manual ball valve or a pneumatic ball valve, this method has a simple structure and is easy to operate. The spring 4 enables the automatic discharge of air from the vessel body 5 and automatically closes the vessel body after discharge to avoid leakage of materials from the vessel body 5, reduce production costs, and improve exhaust efficiency.

[0065] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. An automatic exhaust device based on a pressure plate, the exhaust device being mounted on a pressure plate (1), characterized in that, include: Valve stem (2), the valve stem (2) passes through the pressure plate (1), a pressure plate (201) is provided on the side of the valve stem (2) close to the vessel body (5), and a pressure cap (202) is provided on the side of the valve stem (2) away from the vessel body (5); Valve seat (3), the valve seat (3) is sleeved on the outside of the valve stem (2), and the valve seat (3) passes through the pressure plate (1), and the valve stem (2) is slidably connected to the valve seat (3); Spring (4), the spring (4) is sleeved on the outside of the valve stem (2), and the two ends of the spring (4) are respectively connected to the pressure cap (202) and the valve seat (3). The spring (4) is used to adjust the position of the valve stem (2) relative to the valve seat (3) so that the exhaust device can switch back and forth between the exhaust state and the closed state. Wherein: when the spring (4) is in a compressed state, the exhaust device is in an exhaust state, and the air between the pressure plate (1) and the vessel body (5) is discharged through the exhaust device; When the spring (4) is in its normal state, the exhaust device is in the closed state.

2. The automatic exhaust device based on a pressure plate as described in claim 1, characterized in that: The pressure cap (202) has a first through hole (203) along the axial direction of the valve stem (2).

3. The automatic exhaust device based on a pressure plate as described in claim 1, characterized in that: The outer circumferential surface of the pressure plate (201) is fitted with a first sealing ring (204).

4. The automatic exhaust device based on a pressure plate as described in claim 1, characterized in that: Also includes: The base (6) is located on the side of the pressure plate (1) near the vessel body (5), and the valve seat (3) is connected to the pressure plate (1) on the side near the vessel body (5) through the base (6). A second sealing ring (601) is installed between the base (6) and the valve seat (3), and the second sealing ring (601) is embedded in the inner wall of the base (6). Wherein: when the spring (4) is in the normal state, the side of the pressure plate (201) near the pressure plate (1) abuts against the side of the base (6) near the pressure plate (201), the outer peripheral surface of the pressure plate (201) abuts against the inner wall of the base (6), and the exhaust device is in the closed state.

5. The automatic exhaust device based on a pressure plate as described in claim 1, characterized in that: Also includes: Guide sleeve (7), the guide sleeve (7) is located between the valve stem (2) and the valve seat (3), and the outer side of the guide sleeve (7) is connected to the inner wall of the valve seat (3), and the inner side of the guide sleeve (7) abuts against the outer wall of the valve stem (2); There are two guide sleeves (7), which are located at both ends of the valve stem (2).

6. The automatic exhaust device based on a pressure plate as described in claim 5, characterized in that: One end of the guide sleeve (7) is connected to the valve seat (3) through the stepped portion (301), and the other end of the guide sleeve (7) is connected to the valve seat (3) through the hole and the elastic retaining ring (302); The outer circumferential surface of the guide sleeve (7) is provided with a second through hole (701) along the axial direction of the valve stem (2).

7. The automatic exhaust device based on a pressure plate as described in claim 4, characterized in that: There is a gap between the valve seat (3) and the valve stem (2), and there is a gap between the base (6) and the valve stem (2).

8. The automatic exhaust device based on a pressure plate as described in claim 1, characterized in that: Also includes: The first flange (8) is located on the side of the pressure plate (1) away from the vessel body (5), and one end of the first flange (8) abuts against the pressure cap (202), and the other end of the first flange (8) is connected to the valve seat (3), and a flange gasket (801) is installed between the first flange (8) and the valve seat (3).

9. The automatic exhaust device based on a pressure plate as described in claim 1, characterized in that: An adjusting shim (205) is installed between the valve stem (2) and the pressure cap (202).

10. A discharge machine, characterized in that: include: Automatic exhaust device based on pressure plate as described in any one of claims 1-9; Pressure plate (1), wherein the automatic exhaust device based on the pressure plate is installed on the pressure plate (1); The vessel body (5) is located on the side of the pressure plate (1) near the pressure plate (201) and is connected to the pressure plate (1). The vessel body (5) is used to store materials.

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