Pressure adjusting device and belt dryer

Abstract

The embodiment of the utility model provides a pressure regulating device and a belt dryer, and relates to the technical field of pressure regulation. The belt dryer comprises a pressure adjusting device, and the pressure adjusting device comprises a sealing box and a pressure adjusting assembly. The sealing box comprises a bottom box and an upper cover which are connected with each other, the upper cover and the bottom box jointly define a sealed space, the bottom box is provided with an air inlet and an air outlet, the air inlet is used for being connected with an air source, and the air outlet is used for being connected with a tensioning air cylinder; the other end of the air flow pipeline is communicated with the air outlet, a pressure regulating valve is installed on the air flow pipeline and used for regulating the flow of air passing through the air flow pipeline, and a regulating knob of the pressure regulating valve is located outside the sealed space. Due to the fact that the pressure regulating valve is located in the sealing box, the pressure regulating valve can be effectively protected from being corroded and damaged by external substances of the sealing box, and the service life of the pressure regulating valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure regulation, and in particular, to a pressure regulation device and a dryer. Background Art

[0002] A dryer is a device for continuously drying materials, and is widely used in industries such as food, pharmaceuticals, and chemicals. The dryer feeds the materials into the drying chamber through a conveyor belt, and removes the moisture in the materials through hot air or other heating methods, so as to achieve the purpose of drying.

[0003] The dryer includes a drying chamber, a gas source and a pressure regulating valve. A plurality of conveying devices are arranged in the drying chamber in sequence along the height direction. The conveying device includes a frame body and a driving member. Installation shafts and a driving shaft are arranged at both ends of the frame body along the extending direction of the frame body. A driven wheel and a driving wheel are respectively installed on the installation shaft and the driving shaft. The driving member is connected to the driving shaft, and the driving member is used for driving the driving shaft to rotate. A conveyor belt is sleeved on the driving wheel and the driven wheel. Two deviation rectifying components are respectively arranged on the installation shaft on both sides of the driven wheel. The deviation rectifying component includes a tensioning cylinder. The gas source is connected to the tensioning cylinder through the pressure regulating valve. The pressure regulating valve can correct the deviation of the driven wheel through the tensioning cylinder to prevent the conveyor belt from shifting.

[0004] After research by the inventor, it is found that the service life of the pressure regulating valve in the existing dryer is relatively low. Summary of the Utility Model

[0005] The purpose of the utility model includes providing a pressure regulating device and a dryer, which can improve the service life of the pressure regulating valve.

[0006] The embodiments of the utility model can be implemented as follows:

[0007] In a first aspect, the utility model provides a pressure regulating device, including:

[0008] A sealing box, the sealing box includes a bottom box and an upper cover which are connected to each other. The upper cover and the bottom box jointly define a sealed space. The bottom box is provided with an air inlet and an air outlet. The air inlet is used for connecting with the gas source, and the air outlet is used for connecting with the tensioning cylinder;

[0009] A pressure regulating component, the pressure regulating component includes a pressure regulating valve and an air flow pipeline. One end of the air flow pipeline is communicated with the air inlet, the other end of the air flow pipeline is communicated with the air outlet, and a pressure regulating valve is installed on the air flow pipeline. The pressure regulating valve is used for regulating the air flow rate in the air flow pipeline;

[0010] Wherein, the adjusting knob of the pressure regulating valve is located outside the sealed space.

[0011] In an optional embodiment, the pressure regulating component further includes a pressure gauge. The pressure gauge is installed on the pressure regulating valve. The pressure gauge is used for displaying the air pressure in the air flow pipeline, and the pressure gauge exposes the sealed space.

[0012] In an alternative embodiment, the upper cover is provided with an opening through which the pressure gauge protrudes, and the opening is sealingly connected to the outer peripheral wall of the pressure gauge.

[0013] In an alternative embodiment, the pressure regulating assembly further includes a first connecting member, a second connecting member and an air flow branch. The pressure regulating valve and the first connecting member are both installed in the air flow pipeline and are successively closer to the air outlet. The first connecting member is a three-way member. One end of the air flow branch is communicated with the air flow pipeline, and the other end of the air flow branch is connected to the first connecting member and is communicated with the air outlet through the first connecting member;

[0014] Wherein, the second connecting member is installed on the air flow branch, and the second connecting member is provided with an air source switch located outside the sealed space, and the air source switch is used to control the on-off of the air flow branch.

[0015] In an alternative embodiment, the pressure regulating assembly further includes a third connecting member. The third connecting member, the pressure regulating valve and the first connecting member are all installed in the air flow pipeline and are successively closer to the air outlet. The third connecting member is a three-way member. The air flow branch is connected to the third connecting member, and the air flow branch is communicated with the air flow pipeline through the third connecting member.

[0016] In an alternative embodiment, the air flow pipeline includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline arranged in sequence. One end of the first pipeline is communicated with the air inlet, and a third connecting member is arranged between the end of the first pipeline far from the air inlet and the second pipeline. A pressure regulating valve is arranged between the second pipeline and the third pipeline. One end of the fourth pipeline is communicated with the air outlet, and a first connecting member is arranged between the end of the fourth pipeline far from the air outlet and the third pipeline.

[0017] In an alternative embodiment, the upper cover is detachably connected to the bottom box.

[0018] In an alternative embodiment, the bottom box is provided with a plurality of connecting parts arranged at intervals along its circumferential direction. The connecting parts are located in the sealed space. The connecting parts are provided with first mounting holes. The upper cover is provided with a plurality of matching parts corresponding to the plurality of connecting parts one by one. The matching parts are provided with second mounting holes. One of the first mounting hole and the second mounting hole is a threaded hole, and the bottom box and the upper cover are connected by a threaded fastener.

[0019] In an alternative embodiment, the adjusting knob can move relative to the pressure regulating valve and has an unlocking position and a locking position relative to the pressure regulating valve. When the adjusting knob is in the unlocking position, the adjusting knob can rotate along its own axis to adjust the size of the air flow in the air flow pipeline. When the adjusting knob is in the locking position, the adjusting knob is fixed relative to the pressure regulating valve.

[0020] In a second aspect, the present utility model provides a drying machine, including an installation tank, a plurality of conveying devices successively installed on the installation tank in the height direction, and a pressure regulating device according to any one of the foregoing embodiments;

[0021] The conveying device includes a conveyor belt and tensioning cylinders arranged on both sides in the width direction of the conveyor belt;

[0022] Wherein, the air outlet of each sealing box is connected to a tensioning cylinder.

[0023] The beneficial effects of the pressure regulating device and the belt dryer provided by the embodiments of the present invention include: Since the pressure regulating valve in this embodiment is located inside the sealing box, it can effectively protect the pressure regulating valve from being corroded and damaged by substances outside the sealing box, thereby improving the service life of the pressure regulating valve. And since the air outlet of each sealing box is connected to a tensioning cylinder, the tensioning cylinders of each layer can be independently adjusted through multiple pressure regulating devices, ensuring the accuracy of the tensioning adjustment of the conveying device each time. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of the pressure regulating device provided in this embodiment without the upper cover assembled;

[0026] Figure 2 It is a schematic structural diagram of the pressure regulating device provided in this embodiment.

[0027] Icons: 1 - Pressure regulating device; 100 - Sealing box; 110 - Bottom box; 111 - Air inlet; 112 - Air outlet; 113 - Connection part; 114 - First mounting hole; 120 - Upper cover; 121 - Fitting part; 122 - Second mounting hole; 200 - Pressure regulating assembly; 210 - Pressure regulating valve; 211 - Pressure gauge; 212 - Adjusting knob; 220 - Air flow pipeline; 221 - First pipeline; 222 - Second pipeline; 223 - Third pipeline; 224 - Fourth pipeline; 230 - First connecting piece; 240 - Second connecting piece; 241 - Air source switch; 250 - Third connecting piece; 260 - Air flow branch; 261 - First branch pipe; 262 - Second branch pipe. Detailed Embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present utility model, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model.

[0032] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0033] It should be noted that the features in the embodiments of the present utility model can be combined with each other without conflict.

[0034] It should be noted that some existing pressure regulating valves with drying machines are directly exposed to the outside. Therefore, when disinfecting the drying machine, the disinfection reagent is likely to corrode the pressure regulating valve, or external water vapor may also enter the pressure regulating valve, which is likely to affect the service life of the pressure regulating valve.

[0035] The following will introduce in detail the specific structure of a pressure regulating device provided by the embodiments of the present utility model and the corresponding technical effects brought thereby with reference to the patent drawings.

[0036] Please refer to Figure 1 - Figure 2, a pressure regulating device 1 provided by an embodiment of the present utility model includes a sealing box 100 and a pressure regulating assembly 200. The sealing box 100 includes a bottom box 110 and an upper cover 120 which are connected to each other. The upper cover 120 and the bottom box 110 jointly define a sealed space. The bottom box 110 is provided with an air inlet 111 and an air outlet 112. The air inlet 111 is used to connect to a gas source, and the air outlet 112 is used to connect to a tensioning cylinder. The pressure regulating assembly 200 includes a pressure regulating valve 210 and an air flow pipeline 220. One end of the air flow pipeline 220 is communicated with the air inlet 111, and the other end of the air flow pipeline 220 is communicated with the air outlet 112. A pressure regulating valve 210 is installed on the air flow pipeline 220. The pressure regulating valve 210 is used to regulate the air flow rate passing through the air flow pipeline 220. The adjusting knob 212 of the pressure regulating valve 210 is located outside the sealed space.

[0037] It can be understood that when the pressure regulating device 1 provided by this embodiment is applied to a dryer, since the pressure regulating valve 210 in this embodiment is located inside the sealing box 100, when the dryer is disinfected, it can effectively prevent the disinfection reagent from corroding the pressure regulating valve 210, and can also prevent water vapor from entering the pressure regulating valve 210, thereby effectively protecting the pressure regulating valve 210 inside the sealing box 100 and improving the service life of the pressure regulating valve 210.

[0038] Specifically, in this embodiment, the pressure regulating assembly 200 further includes a pressure gauge 211. The pressure gauge 211 is installed on the pressure regulating valve 210. The pressure gauge 211 is used to display the air pressure of the air flow pipeline 220, and the pressure gauge 211 exposes the sealed space. It can be understood that through the pressure gauge 211, the air pressure of the air flow pipeline 220 can be displayed, and then it is convenient for the operator to observe whether the air flow pipeline 220 leaks air. When the pressure regulating device 1 is applied to a dryer, after the air inlet 111 is connected to the gas source and the air outlet 112 is connected to the tensioning cylinder, through the pressure gauge 211, it can also be observed whether the tensioning cylinder leaks air, and through the pressure gauge 211, it is also convenient for the operator to adjust the air pressure of the tensioning cylinder more accurately.

[0039] It should be noted that in this embodiment, the upper cover 120 is provided with an opening for the pressure gauge 211 to extend out, and the opening is hermetically connected to the outer peripheral wall of the pressure gauge 211. That is to say, the operator can observe the data shown by the pressure gauge 211 through the pressure gauge 211 extending out of the sealed space. Among them, the opening and the outer peripheral wall of the pressure gauge 211 can be hermetically connected through a sealing ring.

[0040] Of course, in some other embodiments, the upper cover 120 can be provided with an observation window. The observation window is installed with an observation window made of a transparent material. The pressure gauge 211 faces the observation window. That is to say, the pressure gauge 211 in this embodiment is completely inside the sealed space and the pressure gauge 211 exposes the sealed space through the observation window.

[0041] Of course, in some alternative embodiments, the upper cover 120 may also be entirely made of a transparent material, and the pressure gauge 211 faces the upper cover 120 to ensure that the user can observe the data shown by the pressure gauge 211 through the upper cover 120.

[0042] Specifically, the pressure regulating assembly 200 further includes a first connecting member 230, a second connecting member 240, and an air flow branch 260. The pressure regulating valve 210 and the first connecting member 230 are both installed on the air flow pipeline 220 and are successively closer to the air outlet 112. The first connecting member 230 is a three-way member. One end of the air flow branch 260 communicates with the air flow pipeline 220, and the other end of the air flow branch 260 is connected to the first connecting member 230 and communicates with the air outlet 112 through the first connecting member 230. The second connecting member 240 is installed on the air flow branch 260, and the second connecting member 240 is provided with an air source switch 241 located outside the sealed space. The air source switch 241 is used to control the on-off of the air flow branch 260.

[0043] It can be understood that through the setting of the air flow branch 260 in this embodiment, when the pressure regulating valve 210 is in a damaged and closed state, the gas introduced by the air source can still be transported to the tensioning cylinder when the air source switch 241 fully opens the air flow branch 260. The upper cover 120 may be provided with an opening for the air source switch 241 to protrude, and the opening is hermetically connected to the air source switch 241.

[0044] Specifically, the pressure regulating assembly 200 further includes a third connecting member 250. The third connecting member 250, the pressure regulating valve 210, and the first connecting member 230 are all installed on the air flow pipeline 220 and are successively closer to the air outlet 112. The third connecting member 250 is a three-way member. The air flow branch 260 is connected to the third connecting member 250, and the air flow branch 260 communicates with the air flow pipeline 220 through the third connecting member 250.

[0045] The air flow pipeline 220 includes a first pipeline 221, a second pipeline 222, a third pipeline 223, and a fourth pipeline 224 arranged in sequence. One end of the first pipeline 221 communicates with the air inlet 111. A third connecting member 250 is provided between the end of the first pipeline 221 far from the air inlet 111 and the second pipeline 222. A pressure regulating valve 210 is provided between the second pipeline 222 and the third pipeline 223. One end of the fourth pipeline 224 communicates with the air outlet 112. A first connecting member 230 is provided between the end of the fourth pipeline 224 far from the air outlet 112 and the third pipeline 223.

[0046] It can be understood that since the third connecting member 250 is a three-way member, therefore, in addition to connecting the third connecting member 250 to the first pipeline 221 and the second pipeline 222, it can also be connected to the air flow branch 260. In other words, the air flow branch 260 is connected to the first pipeline 221 and the second pipeline 222 through the third connecting member 250. Therefore, the gas transmitted from the air inlet 111 by the air source can pass through the first pipeline 221 and then be split by the third connecting member 250 to the second pipeline 222 and the air flow branch 260.

[0047] Similarly, since the first connecting member 230 is also a three-way member, therefore, in addition to connecting the first connecting member 230 to the third pipeline 223 and the fourth pipeline 224, it can also be connected to the air flow branch 260. In other words, the air flow branch 260 can be connected to the third pipeline 223 and the fourth pipeline 224 through the third connecting member 250. Therefore, after the gas transmitted by the air source passes through the air flow branch 260, it can then flow into the fourth pipeline 224 through the first connecting member 230 and be discharged from the air outlet 112.

[0048] Specifically, the air flow branch 260 includes a first branch pipe 261 and a second branch pipe 262. Two ends of the first branch pipe 261 are respectively connected to one end of the air source switch 241 and the third connecting member 250, and two ends of the second branch pipe 262 are respectively connected to the other end of the air source switch 241 and the first connecting member 230.

[0049] In order to facilitate the operator to disassemble and assemble the sealing box 100 to maintain the pressure regulating component 200 inside the sealing box 100, the upper cover 120 and the bottom box 110 in this embodiment are detachably connected.

[0050] The bottom box 110 is provided with a plurality of connecting portions 113 spaced along its circumferential direction. The connecting portions 113 are located inside the sealing space. The connecting portions 113 are provided with first installation holes 114. The upper cover 120 is provided with a plurality of matching portions 121 arranged corresponding to the plurality of connecting portions 113 one by one. The matching portions 121 are provided with second installation holes 122. One of the first installation hole 114 and the second installation hole 122 is a threaded hole. The bottom box 110 and the upper cover 120 are connected by a threaded fastener. That is to say, the threaded fastener can pass through the second installation hole 122 and the first installation hole 114. Specifically, in this embodiment, the first installation hole 114 is a threaded hole, and the first installation hole 114 is a through hole.

[0051] In order to ensure that the connection strength between the upper cover 120 and the bottom box 110 is relatively uniform, the plurality of connecting portions 113 are evenly spaced along the circumferential direction of the bottom box 110.

[0052] Optionally, to prevent an operator or the external environment from accidentally touching the adjustment knob 212 to adjust the flow rate of the air flow pipeline 220, in some embodiments, the adjustment knob 212 can move relative to the pressure regulating valve 210 and has an unlocked position and a locked position relative to the pressure regulating valve 210. When the adjustment knob 212 is in the unlocked position, the adjustment knob 212 can rotate along its own axis to adjust the size of the air flow pipeline 220. When the adjustment knob 212 is in the locked position, the adjustment knob 212 is fixed relative to the pressure regulating valve 210. That is to say, at this time, the adjustment knob 212 cannot rotate along its own axis.

[0053] Specifically, when the adjustment knob 212 is not subject to an external force, the adjustment knob 212 is in the locked position. When the pressure regulating device 1 is placed upright, the adjustment knob 212 extends out of the top of the bottom box 110. Therefore, when the user needs to adjust the air flow rate in the air flow pipeline 220 through the adjustment knob 212, the adjustment knob 212 needs to be driven to move upward along its own axis so that the adjustment knob 212 moves from the locked position to the unlocked position. Then, the operator can turn the adjustment knob 212 to adjust the air flow rate in the air flow pipeline 220. After the adjustment is completed, the adjustment knob 212 can also fall under the action of gravity and then return to the locked position.

[0054] The embodiment of the present utility model also provides a drying machine (not shown in the figure). The drying machine includes an installation tank and a plurality of conveying devices and a plurality of the above-mentioned pressure regulating devices 1 sequentially installed on the installation tank in the height direction. It should be noted that the inside of the installation tank is a drying chamber. The conveying device includes a conveyor belt and tensioning cylinders arranged on both sides in the width direction of the conveyor belt. The air outlet 112 of each sealing box 100 is connected to a tensioning cylinder.

[0055] It should be noted that since the drying machine has a conventional structure, the rest of the structure of the drying machine will not be described in detail here.

[0056] It should be noted that in some embodiments, the tensioning cylinders on one side of the multi-layer conveying devices sequentially arranged in the height direction in the installation tank are all connected to a pressure regulating valve 210. That is to say, for the multi-layer conveying devices, the left tensioning cylinders in all layers of conveying devices are all connected to a pressure regulating valve 210, and the right tensioning cylinders in all layers of conveying devices are all connected to a pressure regulating valve 210. Each pressure regulating valve 210 controls the tensioning cylinders on one side of all layers. Such a setting cannot independently adjust each layer of conveying devices.

[0057] In this embodiment, since the air outlet 112 of each sealing box 100 is connected to a tensioning cylinder, the tensioning cylinders of each layer can be independently adjusted through a plurality of pressure regulating devices 1, ensuring the accuracy of the tensioning adjustment of each conveying device each time.

[0058] In summary, the embodiment of the present utility model provides a pressure regulating device 1 and a dryer. The dryer includes the pressure regulating device 1, and the pressure regulating device 1 includes a sealing box 100 and a pressure regulating component 200. The sealing box 100 includes a bottom box 110 and an upper cover 120 which are connected to each other. The upper cover 120 and the bottom box 110 jointly define a sealed space. The bottom box 110 is provided with an air inlet 111 and an air outlet 112. The air inlet 111 is used to connect with an air source, and the air outlet 112 is used to connect with a tensioning cylinder. The pressure regulating component 200 includes a pressure regulating valve 210 and an air flow pipeline 220. One end of the air flow pipeline 220 is communicated with the air inlet 111, and the other end of the air flow pipeline 220 is communicated with the air outlet 112. A pressure regulating valve 210 is installed on the air flow pipeline 220. The pressure regulating valve 210 is used to adjust the air flow rate passing through the air flow pipeline 220, and the adjusting knob 212 of the pressure regulating valve 210 is located outside the sealed space. Since the pressure regulating valve 210 in this embodiment is located inside the sealing box 100, it can effectively protect the pressure regulating valve 210 from being corroded and damaged by substances outside the sealing box 100, thereby improving the service life of the pressure regulating valve 210. And since the air outlet 112 of each sealing box 100 is connected to a tensioning cylinder, the tensioning cylinders of each layer can be independently adjusted through multiple pressure regulating devices 1, ensuring the accuracy of the tensioning adjustment of the conveying device each time.

[0059] As described above, the above is only the specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A pressure regulating device, characterized in that, Comprising: A sealed box (100), the sealed box (100) includes a bottom box (110) and an upper cover (120) connected to each other. The upper cover (120) and the bottom box (110) jointly define a sealed space. The bottom box (110) is provided with an air inlet (111) and an air outlet (112). The air inlet (111) is used to connect to an air source, and the air outlet (112) is used to connect to a tensioning cylinder; A pressure regulating assembly (200), the pressure regulating assembly (200) includes a pressure regulating valve (210) and an air flow pipeline (220). One end of the air flow pipeline (220) is communicated with the air inlet (111), and the other end of the air flow pipeline (220) is communicated with the air outlet (112). The pressure regulating valve (210) is installed on the air flow pipeline (220), and the pressure regulating valve (210) is used to regulate the air flow rate passing through the air flow pipeline (220); Wherein, the adjusting knob (212) of the pressure regulating valve (210) is located outside the sealed space.

2. The pressure regulating device according to claim 1, characterized in that: The pressure regulating assembly (200) further includes a pressure gauge (211). The pressure gauge (211) is installed on the pressure regulating valve (210). The pressure gauge (211) is used to display the air pressure of the air flow pipeline (220), and the pressure gauge (211) exposes the sealed space.

3. The pressure regulating device according to claim 2, characterized in that: The upper cover (120) is provided with an opening for the pressure gauge (211) to extend out, and the opening is hermetically connected to the outer peripheral wall of the pressure gauge (211).

4. The pressure regulating device according to claim 1, characterized in that: The pressure regulating assembly (200) further includes a first connecting member (230), a second connecting member (240) and an air flow branch (260). The pressure regulating valve (210) and the first connecting member (230) are both installed on the air flow pipeline (220) and are successively close to the air outlet (112). The first connecting member (230) is a three-way member. One end of the air flow branch (260) is communicated with the air flow pipeline (220), and the other end of the air flow branch (260) is connected to the first connecting member (230) and is communicated with the air outlet (112) through the first connecting member (230); Wherein, the second connecting member (240) is installed on the air flow branch (260). The second connecting member (240) is provided with an air source switch (241) located outside the sealed space, and the air source switch (241) is used to control the on-off of the air flow branch (260).

5. The pressure regulating device according to claim 4, characterized in that: The pressure regulating assembly (200) further includes a third connecting member (250). The third connecting member (250), the pressure regulating valve (210), and the first connecting member (230) are all installed on the air flow pipeline (220) and are successively closer to the air outlet (112). The third connecting member (250) is a three-way member. The air flow branch (260) is connected to the third connecting member (250), and the air flow branch (260) is communicated with the air flow pipeline (220) through the third connecting member (250).

6. The pressure regulating device according to claim 5, characterized in that: The air flow pipeline (220) includes a first pipeline (221), a second pipeline (222), a third pipeline (223), and a fourth pipeline (224) arranged in sequence. One end of the first pipeline (221) is communicated with the air inlet (111). The third connecting member (250) is arranged between the end of the first pipeline (221) far from the air inlet (111) and the second pipeline (222). The pressure regulating valve (210) is arranged between the second pipeline (222) and the third pipeline (223). One end of the fourth pipeline (224) is communicated with the air outlet (112). The first connecting member (230) is arranged between the end of the fourth pipeline (224) far from the air outlet (112) and the third pipeline (223).

7. The pressure regulating device according to claim 1, characterized in that: The upper cover (120) is detachably connected to the bottom box (110).

8. The pressure regulating device according to claim 7, characterized in that: The bottom box (110) is provided with a plurality of connecting parts (113) arranged at intervals along its circumferential direction. The connecting parts (113) are located in the sealed space. The connecting parts (113) are provided with first mounting holes (114). The upper cover (120) is provided with a plurality of matching parts (121) arranged corresponding to the plurality of connecting parts (113). The matching parts (121) are provided with second mounting holes (122). One of the first mounting hole (114) and the second mounting hole (122) is a threaded hole. The bottom box (110) and the upper cover (120) are connected by threaded fasteners.

9. The pressure regulating device according to claim 1, characterized in that: The adjusting knob (212) can move relative to the pressure regulating valve (210) and has an unlocking position and a locking position relative to the pressure regulating valve (210). When the adjusting knob (212) is in the unlocking position, the adjusting knob (212) can rotate along its own axis to adjust the size of the air flow in the air flow pipeline (220). When the adjusting knob (212) is in the locking position, the adjusting knob (212) is fixed relative to the pressure regulating valve (210).

10. A drying machine, characterized in that, It includes an installation tank, a plurality of conveying devices successively installed on the installation tank in the height direction, and a pressure regulating device according to any one of claims 1-9; The conveying device includes a conveyor belt and tension cylinders arranged on both sides in the width direction of the conveyor belt; Wherein, the air outlet (112) of each sealing box (100) is connected to a tension cylinder.

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