Vacuum machine pressure relief device

Abstract

The utility model provides a pressure relief device of a vacuum machine. The pressure relief device comprises a knob, a pressure relief mechanism, a transmission mechanism and a reset mechanism, the pressure relief mechanism is fixedly installed on the vacuum machine body and provided with a pressure relief opening communicated with the negative pressure cavity and a plug covering the pressure relief opening in an openable and closable mode. The input end of the transmission mechanism is in transmission connection with the knob, and the output end is fixedly connected with the plug; the reset mechanism is arranged between the vacuum machine body and the transmission mechanism and is in transmission connection with the transmission mechanism. When the pressure relief valve is used, the knob is rotated to enable the transmission mechanism to drive the plug to move, so that the pressure relief opening is opened for pressure relief; after pressure relief is completed, the rotary knob is rotated to return, and under the action of the reset mechanism, the transmission mechanism drives the plug to return and closes the pressure relief opening again. In the pressure relief process, only the plug moves back and forth to open or close the pressure relief opening, and the air pipe, communicated with the negative pressure cavity, of the pressure relief mechanism does not need to move at all, so that fatigue fracture caused by frequent bending of the joint of the pressure relief mechanism and the air pipe can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum sealing machines, and particularly relates to a pressure relief device for a vacuum machine. Background Art

[0002] A vacuum sealing machine is a device used to pump out the air inside a packaging bag to achieve a predetermined vacuum degree inside the packaging bag and then seal it. When evacuating, the bag opening of the packaging bag is placed in a closed cavity, and the air in the packaging bag is pumped out by a vacuum pump through pumping air into the closed cavity. When the packaging bag needs to be taken out after sealing, it is difficult to open the sealing cavity due to the negative pressure inside the closed cavity.

[0003] Chinese patent document CN219506633U discloses a pressure relief valve structure of a vacuum sealing machine: a support is arranged inside a housing, an air vent rod is movably arranged on the support, a knob drives the air vent rod to move through a transmission mechanism, a pressure relief port for communicating with a negative pressure cavity is arranged at the other end of the air vent rod, a plug is arranged inside the housing opposite to the pressure relief port, and an elastic member for driving the pressure relief port and the plug to be in sealing cooperation is arranged inside the housing. In the above technical solution, by rotating the knob, the air vent rod is driven to move, and then the pressure relief port and the plug are driven to be in sealing cooperation, so as to realize pressure relief of the closed cavity. However, in the above technical solution, the L-shaped pipe moves up and down with the air vent rod every time pressure is relieved. Since the air pipe is communicated with the air vent of the L-shaped pipe, after long-term use, the connection between the air pipe and the air vent will be fatigued and broken due to frequent bending, thus affecting the use of the vacuum sealing machine.

[0004] Therefore, it is necessary to provide a pressure relief device for a vacuum machine that can be used for a long time and does not cause the connection between the air pipe and the air vent to break. Summary of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the technical defect that in the prior art, the L-shaped pipe for pressure relief is installed on the air vent rod, and the L-shaped pipe moves up and down with the air vent rod every time pressure is relieved. After long-term use, the connection between the air pipe and the air vent will be fatigued and broken due to frequent bending, thus affecting the normal use of the vacuum sealing machine. Therefore, a pressure relief device for a vacuum machine that can be used for a long time and does not cause the connection between the air pipe and the air vent to break is provided.

[0006] To this end, the utility model provides a pressure relief device for a vacuum machine, including:

[0007] A knob rotatably installed on the vacuum machine housing, with one end located outside the vacuum machine housing and the other end extending into the vacuum machine housing;

[0008] A pressure relief mechanism fixedly installed on the vacuum machine body, having a pressure relief port communicating with the negative pressure cavity and a plug that can be opened and closed to cover the pressure relief port;

[0009] A transmission mechanism, the input end of which is in driving connection with the knob, and the output end of which is fixedly connected with the plug;

[0010] A reset mechanism, which is arranged between the vacuum machine body and the transmission mechanism and is in driving connection with the transmission mechanism;

[0011] In the initial state, under the action of the reset mechanism, the transmission mechanism drives the plug to close the pressure relief port;

[0012] When an external force is applied to the knob, under the drive of the knob, the transmission mechanism overcomes the acting force of the reset mechanism and then drives the plug to open the pressure relief port.

[0013] Further, the transmission mechanism includes:

[0014] A swing arm, which is swingably mounted on the vacuum machine body through a first mounting structure, and one end of which is fixedly connected with the plug;

[0015] A transmission rod, which is rotatably mounted on the vacuum machine body through a second mounting structure, one end of which is in driving connection with the other end of the knob through a first connection mechanism, and the other end of which is in driving connection with the other end of the swing arm through a second connection structure.

[0016] Further, the second mounting structure includes:

[0017] Two first supports, which are arranged oppositely and are respectively fixedly mounted on the vacuum machine body;

[0018] Two rotating shaft sleeves, which are respectively rotatably mounted on the first supports, and the two rotating shaft sleeves are respectively fixedly connected with the two ends of the transmission rod.

[0019] Further, the first mounting structure includes:

[0020] Two second supports, which are arranged oppositely and are respectively fixedly mounted on the vacuum machine body; the swing arm passes through between the two second supports, and both sides of the swing arm are respectively rotatably connected with the two second supports.

[0021] Further, the first connection structure includes:

[0022] A first connection arm, which is formed on the rotating shaft sleeve close to the knob side;

[0023] A long strip hole, which is opened on the first connection arm;

[0024] A second connection arm, which is formed on the other end of the knob;

[0025] The connecting column is formed at the free end of the second connecting arm and movably passes through the long hole.

[0026] Furthermore, it further includes:

[0027] The first guiding groove is opened on the rotating shaft sleeve near the knob side;

[0028] The first limiting protrusion is formed at the end of the first guiding groove;

[0029] The first limiting member has one end fixedly connected to the vacuum machine body and the other end formed with a first limiting portion; the first limiting portion extends into the first guiding groove and can be mutually limited with the first limiting protrusion.

[0030] Furthermore, the second connecting structure includes:

[0031] The pushing block is formed on the rotating shaft sleeve near the swing arm side; a guiding inclined surface is provided on the pushing block;

[0032] When the rotating shaft sleeve rotates, the guiding inclined surface can be abutted against the other end of the swing arm under the drive of the rotating shaft sleeve and guide the pushing block to slide below the swing arm, thereby jacking up the other end of the swing arm.

[0033] Furthermore, it further includes:

[0034] The second guiding groove is opened on the rotating shaft sleeve near the swing arm side;

[0035] The second limiting protrusion is formed at the end of the second guiding groove;

[0036] The second limiting member has one end fixedly connected to the vacuum machine body and the other end formed with a second limiting portion; the second limiting portion extends into the second guiding groove and can be mutually limited with the second limiting protrusion.

[0037] Furthermore, the reset mechanism includes:

[0038] The spring has one end fixedly connected to the vacuum machine body and the other end fixedly connected to the part of the swing arm between the second support and the other end of the swing arm.

[0039] Furthermore, the pressure relief mechanism includes:

[0040] The mounting seat is fixedly installed on the vacuum machine body,

[0041] The L-shaped pipe is fixedly installed on the mounting seat. The free end of the horizontal part of the L-shaped pipe is communicated with the negative pressure cavity, and the free end of the vertical part of the L-shaped pipe is provided with the pressure relief port.

[0042] The technical solution provided by the utility model has the following advantages:

[0043] The pressure relief device of the vacuum machine of the utility model includes a knob, a pressure relief mechanism, a transmission mechanism and a reset mechanism; wherein, the knob is rotatably installed on the vacuum machine housing, one end is located outside the vacuum machine housing, and the other end extends into the vacuum machine housing; the pressure relief mechanism is fixedly installed on the vacuum machine body, and has a pressure relief port communicated with the negative pressure chamber and a plug that can be opened and closed to cover the pressure relief port; the input end of the transmission mechanism is in transmission connection with the knob, and the output end is fixedly connected with the plug; the reset mechanism is arranged between the vacuum machine body and the transmission mechanism and is in transmission connection with the transmission mechanism; in the initial state, the transmission mechanism drives the plug to close the pressure relief port under the action of the reset mechanism; when an external force is applied to the knob, the transmission mechanism is driven by the knob to overcome the acting force of the reset mechanism and then drives the plug to open the pressure relief port.

[0044] For the pressure relief device of the vacuum machine of the utility model, the pressure relief mechanism is connected to the negative pressure chamber through a trachea, the pressure relief mechanism is fixedly connected to the vacuum machine body, and the plug is fixedly connected to the transmission structure. During use, when pressure relief is required, rotate the knob to drive the plug to move by the transmission mechanism, so as to open the pressure relief port; after the pressure relief is completed, rotate the knob to return it to its original position, and under the action of the reset mechanism, the transmission mechanism drives the plug to return to its original position and re-close the pressure relief port. During the pressure relief process, only the plug in the pressure relief mechanism moves back and forth to open or close the pressure relief port, and other components of the pressure relief mechanism and the trachea communicated with the negative pressure chamber do not need to move at all, so that fatigue fracture caused by frequent bending at the connection between the pressure relief mechanism and the trachea can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the prior art or the specific embodiments of the utility model, the following briefly introduces the drawings used in the description of the prior art or the specific embodiments.

[0046] Figure 1 It is a schematic diagram of the overall structure of the vacuum machine of the utility model.

[0047] Figure 2 It is a schematic diagram of the structure of the pressure relief device of the vacuum machine of the utility model after being installed and assembled on the vacuum machine body.

[0048] Figure 3 It is Figure 2 The enlarged structural schematic diagram of part A in

[0049] Figure 4 It is a schematic diagram of the structure after removing the vacuum machine housing, the vacuum machine body and the first support.

[0050] Figure 5It is a schematic structural diagram of the pressure relief mechanism.

[0051] Reference numerals: 1, knob; 11, second connecting arm; 12, connecting column; 100, vacuum machine body; 2, pressure relief mechanism; 200, vacuum machine housing; 21, plug; 22, mounting seat; 23, L-shaped pipe; 231, pressure relief port; 31, swing arm; 32, transmission rod; 33, first support; 34, rotating shaft sleeve; 341, first connecting arm; 342, long hole; 343, first guide groove; 344, first limiting protrusion; 345, pushing block; 346, guiding inclined surface; 347, second guide groove; 348, second limiting protrusion; 35, second support; 36, first limiting member; 361, first limiting portion; 37, second limiting member; 371, second limiting portion; 38, spring. Detailed implementation manners

[0052] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0053] It should be noted that the terms "first", "second", etc. in the claims and the description of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the clearly listed steps or units, but may also include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0054] In this application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this application can be understood according to specific circumstances. Additionally, the meaning of the term "a plurality of" should be two or more. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0055] The following will detail this application with reference to the drawings and in combination with embodiments.

[0056] This embodiment provides a pressure relief device for a vacuum machine, as Figures 1-5 shown, which includes a knob 1, a pressure relief mechanism 2, a transmission mechanism, and a reset mechanism; wherein, the knob 1 is rotatably installed on the vacuum machine housing 200, one end is located outside the vacuum machine housing 200, and the other end extends into the interior of the vacuum machine housing 200; the pressure relief mechanism 2 is fixedly installed on the vacuum machine body 100, has a pressure relief port 231 communicated with the negative pressure chamber, and a plug 21 that can be opened and closed to cover the pressure relief port 231; the input end of the transmission mechanism is in transmission connection with the knob 1, and the output end is fixedly connected to the plug 21; the reset mechanism is arranged between the vacuum machine body 100 and the transmission mechanism and is in transmission connection with the transmission mechanism; in the initial state, under the action of the reset mechanism, the transmission mechanism drives the plug 21 to block the pressure relief port 231; when an external force is applied to the knob 1, the transmission mechanism is driven by the knob 1, overcomes the acting force of the reset mechanism, and then drives the plug 21 to open the pressure relief port 231.

[0057] In the vacuum machine pressure relief device of this embodiment, the pressure relief mechanism 2 is connected to the negative pressure chamber through an air pipe, the pressure relief mechanism 2 is fixedly connected to the vacuum machine body 100, and the plug 21 is fixedly connected to the transmission structure. During use, when pressure relief is required, the knob 1 is rotated to make the transmission mechanism drive the plug 21 to move, thereby opening the pressure relief port 231 for pressure relief; after the pressure relief is completed, the knob 1 is rotated to return it to its original position, and under the action of the reset mechanism, the transmission mechanism drives the plug 21 to return to its original position and re-close the pressure relief port 231. During the pressure relief process, only the plug 21 in the pressure relief mechanism 2 moves back and forth to open or close the pressure relief port 231, while other components of the pressure relief mechanism 2 and the air pipe connected to the negative pressure chamber do not need to move at all, thereby avoiding fatigue fracture of the connection between the pressure relief mechanism 2 and the air pipe due to frequent bending.

[0058] The vacuum machine pressure relief device of this embodiment, further, the transmission mechanism includes a swing arm 31 and a transmission rod 32; wherein, the swing arm 31 is swingably mounted on the vacuum machine body 100 through a first mounting structure, and one end is fixedly connected to the plug 21; the transmission rod 32 is rotatably mounted on the vacuum machine body 100 through a second mounting structure, one end of which is transmission connected to the other end of the knob 1 through a first connecting mechanism, and the other end is transmission connected to the other end of the swing arm 31 through a second connecting structure.

[0059] The vacuum machine pressure relief device of this embodiment, further, the second mounting structure includes a first support 33 and a rotating shaft sleeve 34; there are two first supports 33, which are arranged opposite to each other and are fixedly mounted on the vacuum machine body 100 respectively; there are two rotating shaft sleeves 34, which are rotatably mounted on the first supports 33 respectively, and the two rotating shaft sleeves 34 are fixedly connected to the two ends of the transmission rod 32 respectively.

[0060] The vacuum machine pressure relief device of this embodiment, further, the first mounting structure includes two second supports 35, the second supports 35 are oppositely arranged and respectively fixedly mounted on the vacuum machine body 100; the swing arm 31 passes between the two second supports 35, and the two sides are respectively rotatably connected to the two second supports 35.

[0061] The vacuum machine pressure relief device of this embodiment, the first connecting structure includes a first connecting arm 341, a long hole 342, a second connecting arm 11 and a connecting column 12; the first connecting arm 341 is formed on the rotating shaft sleeve 34 close to the side of the knob 1; the long hole 342 is opened on the first connecting arm 341; the second connecting arm 11 is formed at the other end of the knob 1; the connecting column 12 is formed at the free end of the second connecting arm 11, and is movably inserted into the long hole 342.

[0062] The pressure relief device of the vacuum machine in this embodiment further includes a first guiding groove 343, a first limiting protrusion 344, and a first limiting member 36. The first guiding groove 343 is formed on the rotating shaft sleeve 34 near the knob 1. The first limiting protrusion 344 is formed at the end of the first guiding groove 343. One end of the first limiting member 36 is fixedly connected to the vacuum machine body, and the other end is formed with a first limiting portion 361. The first limiting portion 361 extends into the first guiding groove 343 and can be mutually limited with the first limiting protrusion 344.

[0063] In this embodiment, the mutual limitation between the first limiting portion 361 and the first limiting protrusion 344 can prevent the knob 1 from being screwed too much, so that the rotation range of the knob 1 is always maintained between the positions of opening the pressure relief port 231 and closing the pressure relief port 231, thereby ensuring that the user can accurately control the opening and closing of the pressure relief port 231 through the knob 1.

[0064] For the pressure relief device of the vacuum machine in this embodiment, the second connection structure includes a pushing block 345. The pushing block 345 is formed on the rotating shaft sleeve 34 near the swing arm 31. A guiding inclined surface 346 is provided on the pushing block 345. When the rotating shaft sleeve 34 rotates, the guiding inclined surface 346 can be driven by the rotating shaft sleeve 34 to abut against the other end of the swing arm 31 and guide the pushing block 345 to slide under the swing arm 31, thereby jacking up the other end of the swing arm 31.

[0065] The pressure relief device of the vacuum machine in this embodiment further includes a second guiding groove 347, a second limiting protrusion 348, and a second limiting member 37. The second guiding groove 347 is formed on the rotating shaft sleeve 34 near the swing arm 31. The second limiting protrusion 348 is formed at the end of the second guiding groove 347. One end of the second limiting member 37 is fixedly connected to the vacuum machine body, and the other end is formed with a second limiting portion 371. The second limiting portion 371 extends into the second guiding groove 347 and can be mutually limited with the second limiting protrusion 348.

[0066] In this embodiment, the mutual limitation between the second limiting portion 371 and the second limiting protrusion 348 can, on the one hand, also prevent the knob 1 from being screwed too much, so as to ensure that the user can accurately control the opening and closing of the pressure relief port 231 through the knob 1. On the other hand, it can also ensure that the movement range of the pushing block 345 is always between the positions of jacking up the other end of the swing arm 31 and making the other end of the swing arm 31 fall back down, thereby ensuring the accuracy of the movement of the pushing block 345.

[0067] For the vacuum machine pressure relief device of this embodiment, the reset mechanism includes a spring 38. One end of the spring 38 is fixedly connected to the vacuum machine body 100, and the other end is fixedly connected to a portion of the swing arm 31 located between the second support 35 and the other end of the swing arm 31.

[0068] For the vacuum machine pressure relief device of this embodiment, the pressure relief mechanism 2 includes a mounting base 22 and an L-shaped pipe 23. The mounting base 22 is fixedly installed on the vacuum machine body 100, the L-shaped pipe 23 is fixedly installed on the mounting base 22, the free end of the horizontal portion of the L-shaped pipe 23 is communicated with the negative pressure chamber, and a pressure relief port 231 is provided at the free end of the vertical portion of the L-shaped pipe.

[0069] The working principle of the vacuum machine pressure relief device of this embodiment is as follows:

[0070] During the use process, when pressure relief is required, rotate the knob 1 to drive the second connecting arm 11 to drive the connecting column 12 to rotate around the axis of the knob 1. Then, through the cooperation with the long strip hole 342, drive the first connecting arm 341, the rotating shaft sleeve 34, and the transmission rod 32 to rotate. The rotation of the transmission rod 32 drives the top push block 345 to rotate around the axis of the transmission rod 32 through the rotating shaft sleeve 34. Under the guidance of the guiding inclined surface 346, the top push block 345 slides below the swing arm 31, and then the end of the corresponding swing arm 31 close to the top push block 345 is pushed upward. During the process that the end of the swing arm 31 close to the top push block 345 is pushed upward, the end of the swing arm 31 far from the top push block 345 drives the plug 21 to move downward, thereby opening the pressure relief port 231 for pressure relief.

[0071] After the pressure relief is completed, rotate the knob 1 back to its initial position. Driven by the second connecting arm 11 and the connecting column 12, the first connecting arm 341, the rotating shaft sleeve 34, and the transmission rod 32 also return to their initial positions. At the same time, the rotating shaft sleeve 34 drives the top push block 345 to move from below the swing arm 31 to its initial position. Under the action of the spring 38, the end of the swing arm 31 close to the top push block 345 falls downward, and the end of the swing arm 31 far from the top push block 345 drives the plug 21 to move upward, thereby closing the pressure relief port 231.

[0072] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of this innovative technical solution.

Claims

1. A vacuum machine pressure relief device, characterized in that: include: A knob (1) is rotatably mounted on the vacuum machine housing (200), one end of which is located outside the vacuum machine housing (200) and the other end of which extends into the interior of the vacuum machine housing (200); A pressure relief mechanism (2) is fixedly mounted on the vacuum machine body (100), and comprises a pressure relief port (231) communicating with the negative pressure chamber, and a plug (21) that can be opened and closed and covers the pressure relief port (231); A transmission mechanism, the input end of which is transmission-connected to the knob (1), and the output end of which is fixedly connected to the plug (21); A reset mechanism, arranged between the vacuum machine body (100) and the transmission mechanism, and in transmission connection with the transmission mechanism; In the initial state, the transmission mechanism, under the action of the reset mechanism, drives the plug (21) to close the pressure relief port (231); When an external force is applied to the knob (1), the transmission mechanism, under the drive of the knob (1), overcomes the action force of the reset mechanism and drives the plug (21) to open the pressure relief port (231).

2. The vacuum machine pressure relief device according to claim 1, characterized in that: The transmission mechanism comprises: A swing arm (31) is swingably mounted on the vacuum machine body (100) via a first mounting structure, and one end of the swing arm is fixedly connected to the plug (21); A transmission rod (32) is rotatably mounted on the vacuum machine body (100) via a second mounting structure, one end of which is transmission-connected to the other end of the knob (1) via a first connection structure, and the other end of which is transmission-connected to the other end of the swing arm (31) via a second connection structure.

3. The vacuum machine pressure relief device according to claim 2, characterized in that: The second mounting structure comprises: There are two first supports (33), which are arranged opposite to each other and are respectively fixedly mounted on the vacuum machine body (100); There are two rotating shaft sleeves (34), which are rotatably mounted on the first support (33) respectively, and the two rotating shaft sleeves (34) are respectively fixedly connected to the two ends of the transmission rod (32).

4. The vacuum machine pressure relief device according to claim 2, characterized in that: The first mounting structure comprises: There are two second supports (35), which are arranged opposite to each other and are respectively fixedly mounted on the vacuum machine body (100); the swing arm (31) passes between the two second supports (35), and the two sides are respectively rotatably connected to the two second supports (35).

5. The vacuum machine pressure relief device according to claim 3, characterized in that: The first connection structure comprises: A first connecting arm (341) formed on the rotating shaft sleeve (34) at a side close to the knob (1); A long hole (342) is formed on the first connecting arm (341); A second connecting arm (11) formed at the other end of the knob (1); The connecting column (12) is formed at the free end of the second connecting arm (11) and is movably inserted into the elongated hole (342).

6. The vacuum machine pressure relief device according to claim 5, characterized in that: Also includes: A first guide groove (343) is formed on the rotating shaft sleeve (34) at a side close to the knob (1); A first limiting protrusion (344) formed at the end of the first guide groove (343); The first limiting member (36) has one end fixedly connected to the vacuum machine body and the other end formed with a first limiting portion (361); the first limiting portion (361) extends into the first guide groove (343) and can limit each other with the first limiting protrusion (344).

7. The vacuum machine pressure relief device according to claim 3, characterized in that: The second connection structure comprises: A push block (345) is formed on the rotating shaft sleeve (34) at a side close to the swing arm (31); a guide inclined surface (346) is provided on the push block (345); When the rotating shaft sleeve (34) rotates, the guiding inclined surface (346) can abut against the other end of the swing arm (31) under the drive of the rotating shaft sleeve (34), and guide the pushing block (345) to slide under the swing arm (31), thereby pushing the other end of the swing arm (31) upward.

8. The vacuum machine pressure relief device according to claim 7, characterized in that: Also includes: A second guide groove (347) is formed on the rotating shaft sleeve (34) at a side close to the swing arm (31); A second limiting protrusion (348) formed at the end of the second guide groove (347); The second limiting member (37) has one end fixedly connected to the vacuum machine body and the other end formed with a second limiting portion (371); the second limiting portion (371) extends into the second guide groove (347) and can limit each other with the second limiting protrusion (348).

9. The vacuum machine pressure relief device according to claim 4, characterized in that: The reset mechanism comprises: A spring (38) having one end fixedly connected to the vacuum machine body (100) and the other end fixedly connected to a portion of the swing arm (31) located between the second support (35) and the other end of the swing arm (31).

10. The vacuum machine pressure relief device according to claim 2, characterized in that: The pressure relief mechanism (2) comprises: The mounting seat (22) is fixedly mounted on the vacuum machine body (100). The L-shaped tube (23) is fixedly mounted on the mounting seat (22); the free end of the horizontal portion of the L-shaped tube (23) is in communication with the negative pressure chamber; and the free end of the vertical portion of the L-shaped tube is provided with the pressure relief port (231).

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