A differential pressure leak detection device for a packaging machine

Abstract

The invention discloses a pressure difference leakage detection device for a packaging machine, which relates to the field of packaging machines, and comprises a workbench, a plurality of detection boxes installed on the workbench, and a pressure difference component for forming a pressure difference inside and outside the detection box, wherein a transmission mechanism for controlling a switch of the detection box is provided on the workbench, and a sensor component for detecting whether a packaging bag is leaking is provided in the detection box. The invention has the advantages of high accuracy and high working efficiency.

Description

Technical Field

[0001] The invention relates to the field of packaging machines, and in particular to a pressure difference leakage detection device of a packaging machine. Background Art

[0002] When packaging bags are sealed through the heat sealing process, sometimes the seal may be damaged due to the high heat sealing temperature, which shortens the shelf life of the food in the packaging bag. When the heat sealing temperature does not reach the heat sealing temperature of the packaging bag or there are foreign objects at the bag opening, it is easy to cause the packaging bag to be loosely sealed and air to enter the packaging bag, affecting the storage time of the food. Therefore, it is necessary to screen them. The existing method is generally manual screening, which is inefficient and prone to omissions. Summary of the invention

[0003] In order to overcome the shortcomings of the background technology, the present invention provides a pressure difference leak detection device for a packaging machine with high accuracy and high working efficiency.

[0004] The technical solution adopted by the present invention is: a pressure difference leak detection device for a packaging machine, which includes a workbench, a plurality of detection boxes installed on the workbench, and a pressure difference component that forms a pressure difference inside and outside the detection box. The workbench is provided with a transmission mechanism for controlling the switch of the detection box, and the detection box is provided with a sensor component for detecting whether a packaging bag is leaking.

[0005] The detection box comprises a first half box body and a second half box body, a pressing plate for the sensing assembly to contact the packaging bag, a pressure sensor connected to the pressing plate, and a base for installing the pressure sensor.

[0006] The workbench is a rotating workbench; the first half box is vertically slidably installed on the rotating workbench; a first disc is provided under the rotating workbench; the transmission mechanism includes a first transmission part that drives the first half box to move up and down and a second transmission part that drives the second half box to switch.

[0007] The first transmission part adopts a first driving member vertically installed on the rotating workbench, and the output end of the first driving member is fixedly connected to the first half box.

[0008] The first transmission part adopts a first inclined surface arranged in the circumference of the first disk; the rotating workbench is provided with a vertically installed first guide sleeve, and the first half box is provided with a first guide shaft slidably installed in the first guide sleeve. The first inclined surface drives the first half box to move up and down through the first guide shaft, and a first elastic member providing a reset preload force is provided between the first half box and the rotating workbench.

[0009] A first bottom plate is fixedly connected to the lower end of the first guide shaft, and a first roller rollingly matched with the first slope surface is provided on the first bottom plate.

[0010] The second transmission part comprises:

[0011] A first bracket, which extends radially outward from the rotary table and is hingedly connected to the lower surface of the second half box;

[0012] A first mounting rod, which is fixedly mounted on the first bracket;

[0013] A first swing arm, one end of which is hingedly mounted on the first mounting rod;

[0014] A first connecting rod, two ends of which are respectively hinged to the second half box and the first swing arm;

[0015] A second slope surface is also provided in the circumferential direction of the first disc; the middle position of the first swing arm is in rolling cooperation with the second slope surface.

[0016] The workbench is a rotating workbench; the first half box is vertically slidably installed on the rotating workbench; a third disc is provided under the rotating workbench; the transmission mechanism includes a third transmission part that drives the first half box to move up and down, and a fourth transmission part is provided between the first half box and the second half box to drive the second half box to perform synchronous switching actions.

[0017] The third transmission part adopts a third slope surface arranged in the circumference of the third disk; a vertically installed third guide sleeve is provided on the rotating workbench, and a third guide shaft slidably installed in the third guide sleeve is provided on the first half box body. The third slope surface drives the first half box body to move up and down through the third guide shaft, and a fifth elastic member providing a reset preload force is provided between the first half box body and the rotating workbench.

[0018] A third bottom plate is fixedly connected to the lower end of the third guide shaft, and the third bottom plate is in rolling cooperation with the third slope surface.

[0019] The fourth transmission part comprises:

[0020] A pull rod, the upper end of which is hingedly mounted on the side wall of the first half box;

[0021] A second elastic member, which is sleeved on the pull rod;

[0022] A guide sleeve shaft, which is rotatably mounted on the side wall of the second half box and is provided with a through hole for the lower end of the pull rod to slide and fit;

[0023] A support extending radially outward from the rotary table and hingedly connected to the lower surface of the second half box;

[0024] A limiting cushion for limiting the swing angle of the second half box is provided on the upper surface of the support.

[0025] The workbench is a rotating workbench; a second disc is provided below the rotating workbench, the first half box is installed in the circumference of the rotating workbench, and the transmission mechanism includes a fifth transmission part for driving the switch of the second half box.

[0026] The fifth transmission unit comprises:

[0027] A second bracket, which is fixedly mounted on the lower surface of the rotating worktable;

[0028] a second mounting rod vertically mounted on the second bracket;

[0029] A second swing arm, one end of which is hingedly mounted on the first half box and one end of which is fixedly connected to the second half box;

[0030] A third swing arm, one end of which is hingedly mounted on the second mounting rod;

[0031] A second connecting rod, two ends of which are respectively hinged to the second swing arm and the third swing arm;

[0032] The second disc is also provided with a fourth slope surface in the circumferential direction; the middle position of the third swing arm is in rolling cooperation with the fourth slope surface, and a third elastic member connecting the second bracket and the third swing arm is provided between the two.

[0033] A clamping piece is arranged in the detection box.

[0034] An elastic member is provided between the base and the detection box;

[0035] A telescopic connecting rod is also provided between the base and the detection box to hinge the two.

[0036] A fourth elastic member connecting the rotating worktable and the second half box is provided between the two.

[0037] An adjusting shaft connecting the base and the detection box and capable of adjusting the installation length is arranged between the base and the detection box; a pressure monitoring meter for monitoring the internal pressure of the detection box is arranged on the detection box.

[0038] The workbench includes a fixed frame and a conveyor belt. The first half box is movably installed on the fixed frame. The second half box is installed on the conveyor belt and is driven to the bottom of the first half box. The transmission mechanism adopts a second driving member fixedly installed on the fixed frame. The output end of the second driving member is fixedly connected to the first half box and drives it to approach and move away from the second half box. A buffer assembly is provided between the fixed frame and the upper surface of the first half box.

[0039] The buffer assembly comprises an upper spring seat fixedly mounted on a fixing frame, a lower spring seat fixedly mounted on a first half box body, and a spring installed between the upper spring seat and the lower spring seat.

[0040] The pressure difference component adopts a vacuum pumping device.

[0041] The beneficial effects of the present invention are as follows: the technical solution places the packaging bag into a detection box, and the pressure difference component vacuums the detection box, so that a pressure difference is formed between the detection box and the packaging bag. If the packaging bag has no leakage, the gas in the packaging bag will expand, thereby squeezing the sensing component. If the packaging bag has a leakage, the gas in the packaging bag will be drawn away by the pressure difference component, and the pressure difference will change, which has the advantages of high accuracy and high working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0043] Figure 2 This is a schematic diagram of the structure of the detection box when it is opened in Example 1.

[0044] Figure 3 It is a schematic diagram of the structure of the detection box of Example 1.

[0045] Figure 4 This is a schematic diagram of the structure of the detection box when it is closed in Example 1.

[0046] Figure 5 This is a schematic diagram of the structure of the detection box when it is opened according to the second embodiment of the present invention.

[0047] Figure 6 This is a schematic diagram of the structure of the detection box of Example 2.

[0048] Figure 7 This is a schematic diagram of the structure of the second embodiment when the detection box is closed.

[0049] Figure 8 It is a cross-sectional view of the detection box of the second embodiment when it is closed.

[0050] Fig. 9 This is a schematic diagram of the structure of the detection box when it is opened according to the third embodiment of the present invention.

[0051] Fig.10 This is a schematic diagram of the structure of the third embodiment when the detection box is closed.

[0052] Fig.11 This is a schematic diagram of the disassembled structure of the detection box of Example 3.

[0053] Fig.12 It is a structural diagram of embodiment 4 of the present invention.

[0054] Fig.13This is a schematic diagram of the structure of the detection box when it is opened according to the fourth embodiment of the present invention.

[0055] Fig.14 It is a schematic diagram of the structure of the detection box of Example 4.

[0056] Fig.15 This is a structural diagram of Embodiment 5 of the present invention.

[0057] Fig.16 This is a schematic diagram of the structure of the detection box of Example 5.

[0058] Fig.17 This is a schematic diagram of the disassembled structure of the detection box in Example 5. DETAILED DESCRIPTION

[0059] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0060] As shown in the figure, a differential pressure leak detection device for a packaging machine includes a workbench, a plurality of detection boxes installed on the workbench, and a differential pressure component 1 for forming a differential pressure inside and outside the detection box. The workbench is provided with a transmission mechanism for controlling the switch of the detection box, and the detection box is provided with a sensor component for detecting whether the packaging bag is leaking; the differential pressure component adopts a vacuum pumping device; the technical scheme forms a differential pressure between the detection box and the packaging bag by placing the packaging bag in the detection box and the differential pressure component vacuuming the detection box. If the packaging bag does not leak, the gas in the packaging bag will expand, thereby squeezing the sensor component. If the packaging bag leaks, the gas in the packaging bag will be sucked away by the differential pressure component, and the differential pressure will change. It has the advantages of high accuracy and high working efficiency.

[0061] The detection box includes a first half box body 2 and a second half box body 3, a pressure plate 4 for the sensing component to contact the packaging bag, a pressure sensor 5 connected to the pressure plate 4, and a base 6 for installing the pressure sensor 5. The base 6 can be installed in the first half box body 2 or the second half box body. The first half box body and the second half box body are sealed when closed. During the vacuuming process, the adjustment shaft adopts an inflatable shaft. After the position is locked, the base will not move. A qualified packaging bag will expand and press the pressure plate to transmit the force to the pressure sensor. Within a period of time when the pressure value after vacuuming remains unchanged, if the value of the pressure sensor remains unchanged, it means that the packaging bag has no leakage. If the value of the pressure sensor changes, it means that the packaging bag has leakage.

[0062] This technical solution has five embodiments;

[0063] Embodiment 1: Figure 2, as shown in 3 and 4, the workbench adopts a rotating workbench 7; the first half box 2 is vertically slidably installed on the rotating workbench 7; a first disc 8 is provided under the rotating workbench 7; the transmission mechanism includes a first transmission part that drives the first half box 2 to move up and down and a second transmission part that drives the second half box 3 to switch; the first transmission part adopts a first driving member 9 vertically installed on the rotating workbench 7, and the output end of the first driving member 9 is fixedly connected to the first half box 2; the first driving member adopts a cylinder, wherein a vertically installed first guide sleeve 11 is provided on the rotating workbench 7, and a first guide shaft 13 slidably installed in the first guide sleeve 11 is provided on the first half box 2, and a fixedly connected first bottom plate 14 is provided at the lower end of the first guide shaft 13, and the output end of the first driving member is fixedly connected to the first bottom plate, thereby realizing a fixed connection with the first half box.

[0064] The second transmission part comprises:

[0065] A first bracket 17, which extends radially outward from the rotary table 7 and is hingedly connected to the lower surface of the second half box 3;

[0066] A first mounting rod 18, which is fixedly mounted on the first bracket 17;

[0067] A first swing arm 19, one end of which is hingedly mounted on the first mounting rod 18;

[0068] The first connecting rod 20, both ends of which are respectively hinged to the second half box 3 and the first swing arm 19;

[0069] A second slope surface 21 is also provided in the circumference of the first disc 8; a second roller 22 that rolls with the second slope surface 21 is provided in the middle position of the first swing arm 19, and the rotating worktable 7 drives the detection box to rotate circumferentially. The second slope surface has a high position and a low position. When the second roller rolls on the second slope surface, it will drive the first swing arm to swing, thereby driving the second half box to swing around the hinge point of the first bracket through the first connecting rod, so as to achieve closing and opening with the first half box; a fourth elastic member 48 connecting the rotating worktable 7 and the second half box 3 is provided between the two to provide elastic preload for the resetting of the second half box.

[0070] The pressure plate in this embodiment is arranged downward, and the pressure sensor is installed on the upper surface of the pressure plate.

[0071] Embodiment 2: Figure 5, 6 and 7, the workbench adopts a rotating workbench 7; the first half box 2 is vertically slidably mounted on the rotating workbench 7; a first disc 8 is provided below the rotating workbench 7; the transmission mechanism includes a first transmission part that drives the first half box 2 to move up and down and a second transmission part that drives the second half box 3 to switch; the first transmission part adopts a first slope surface 10 arranged in the circumference of the first disc 8; a first vertically mounted first guide sleeve 11 is provided on the rotating workbench 7, and a first guide shaft 13 that is slidably mounted in the first guide sleeve 11 is provided on the first half box 2, and the first guide shaft 13 A first bottom plate 14 is fixedly connected at the lower end, and a first roller 15 is provided on the first bottom plate 14 for rolling cooperation with the first slope surface 10. A first elastic member 16 for providing a reset preload is provided between the first half box 2 and the rotating worktable 7; the rotating worktable 7 drives the detection box to rotate circumferentially, and the first roller rolls along the first slope surface. The first slope surface has a high position and a low position. When the first roller rolls on the first slope surface, the first half box is driven to move up and down through the first bottom plate and the first guide shaft. The first elastic member uses a tension spring to provide a reset elastic preload for the first half box.

[0072] The second transmission part comprises:

[0073] A first bracket 17, which extends radially outward from the rotary table 7 and is hingedly connected to the lower surface of the second half box 3;

[0074] A first mounting rod 18, which is fixedly mounted on the first bracket 17;

[0075] A first swing arm 19, one end of which is hingedly mounted on the first mounting rod 18;

[0076] The first connecting rod 20, both ends of which are respectively hinged to the second half box 3 and the first swing arm 19;

[0077] A second slope surface 21 is also provided in the circumference of the first disc 8; a second roller 22 that rolls with the second slope surface 21 is provided in the middle position of the first swing arm 19; the second slope surface has a high position and a low position, and when the second roller rolls on the second slope surface, it will drive the first swing arm to swing, thereby driving the second half box to swing around the hinge point of the first bracket through the first connecting rod, thereby realizing closing and opening with the first half box; a fourth elastic member 48 connecting the rotating workbench 7 and the second half box 3 is provided between the two to provide an elastic preload for the resetting of the second half box.

[0078] The pressure plate in this embodiment is arranged downward, and the pressure sensor is installed on the upper surface of the pressure plate.

[0079] Embodiment three, as Fig. 9 and 10As shown, the workbench adopts a rotating workbench 7; the first half box 2 is vertically slidably mounted on the rotating workbench 7; a third disc 23 is provided below the rotating workbench 7; the transmission mechanism includes a third transmission part for driving the first half box 2 to move up and down, and a fourth transmission part for driving the second half box 3 to perform synchronous switching actions is provided between the first half box 2 and the second half box;

[0080] The third transmission part adopts a third slope surface 24 arranged in the circumference of the third disk 23; the rotating worktable 7 is provided with a vertically installed third guide sleeve 25, the first half box 2 is provided with a third guide shaft 26 slidably installed in the third guide sleeve 25, the lower end of the third guide shaft 26 is provided with a third bottom plate 27 fixedly connected, the third bottom plate 27 is provided with a third roller 28 rollingly matched with the third slope surface 24, and a fifth elastic member 29 for providing a reset preload is provided between the first half box 2 and the rotating worktable 7. Its working principle is the same as the first transmission part in Example 2, and will not be elaborated here.

[0081] The fourth transmission part comprises:

[0082] A pull rod 30, the upper end of which is hingedly mounted on the side wall of the first half box 2;

[0083] A second elastic member 31, which is sleeved on the pull rod 30;

[0084] A guide sleeve shaft 32, which is rotatably mounted on the side wall of the second half box 3 and is provided with a through hole 33 for the lower end of the pull rod 30 to slide and fit;

[0085] A support 34 extending radially outward from the rotary table 7 and hingedly connected to the lower surface of the second half box 3;

[0086] The upper surface of the support 34 is provided with a limit cushion 35 for limiting the swing angle of the second half box 3. The bottom end of the pull rod is provided with a boss that forms a limit fit with the through hole. When the first half box moves up and down, it will drive the second half box to move synchronously through the fourth transmission part. When the first half box rises, the pull rod slides in the through hole of the guide sleeve shaft until the boss contacts the through hole. The second half box will rotate under the pulling of the support and the elastic warning force of the second elastic member. Fig. 9 When the first half box body descends, the pull rod slides in the through hole of the guide sleeve shaft, thereby compressing the second elastic member, which is a spring. The states of the first half box body and the second half box body are as shown in FIG. Fig.10 shown.

[0087] The pressure plate in this embodiment is arranged downward, and the pressure sensor is installed on the upper surface of the pressure plate.

[0088] Embodiment 4: Fig.12 , as shown in 13 and 14, the workbench adopts a rotating workbench 7; a second disc 36 is provided under the rotating workbench 7, the first half box 2 is vertically installed in the circumference of the rotating workbench 7, and the transmission mechanism includes a fifth transmission part that drives the switch of the second half box 3.

[0089] The fifth transmission unit comprises:

[0090] A second bracket 37, which is fixedly mounted on the lower surface of the rotating worktable 7;

[0091] A second mounting rod 38 , which is vertically mounted on the second bracket 37 ;

[0092] A second swing arm 39, one end of which is hingedly mounted on the first half box 2 and one end of which is fixedly connected to the second half box 3;

[0093] A third swing arm 40, one end of which is hingedly mounted on the second mounting rod 38;

[0094] A second connecting rod 41, both ends of which are respectively hinged to the second swing arm 39 and the third swing arm 40;

[0095] The second disc 36 is also provided with a fourth slope surface 42 in the circumferential direction; a fourth roller 43 rollingly matched with the fourth slope surface 42 is provided in the middle position of the third swing arm 40, and a third elastic member 44 connecting the second bracket 37 and the third swing arm 40 is provided. The rotating worktable drives the detection box to rotate, and the fourth roller will roll on the fourth slope surface, and the fourth slope surface is set downward. When the fourth roller rolls to the low point of the fourth slope surface, the third swing arm overcomes the pre-tightening force of the third elastic member and drives the second swing arm to swing upward through the second connecting rod, and the second swing arm can drive the second half box to open, presenting as shown in the figure. Fig.13 state, at this time the robot can put the packaging bag into the first half box to be clamped by the clamping member, when the fourth roller rolls to the high point of the fourth slope surface, the third elastic member resets the third swing arm through the elastic preload force, thereby driving the second swing arm to swing downward through the second connecting rod, so that the second half box and the first half box are closed.

[0096] The detection box is provided with a clamping member 45, which can be a finger cylinder. The clamping member can be arranged on the first half box or the second half box; preferably, the first half box.

[0097] like Figure 8 and 11 As shown, an elastic member 46 is provided between the base 6 and the detection box, and the detection box is preferably the first half box body; when there is no packaging bag, the pressure plate will reset due to its own weight, but since the adjustment shaft may be stuck, the elastic member is required to provide appropriate elastic force to reset it.

[0098] A telescopic connecting rod 47 is also provided between the base 6 and the detection box to connect the two; the detection box is preferably the first half box body, such as Fig.11 As shown, when there is only one adjustment shaft and it is located in the middle, the telescopic connecting rods around it can keep the pressing plate stable when it is raised or lowered, preventing the pressing plate from rotating.

[0099] An adjustment shaft 49 connecting the base 6 and the detection box and capable of adjusting the installation length is provided between the base 6 and the detection box. The detection box is preferably the first half box body. In addition, the adjustment shaft 49 is preferably an inflatable shaft. Different packaging bags have different volumes and thicknesses. In order to accommodate packaging bags of more sizes, the installation height of the pressure plate can be adjusted by adjusting the shaft. The principle of the inflatable shaft is to fix the shaft body by inflation so that it will not move. When not inflated, the shaft body can be moved axially. The inflatable shaft is a prior art and will not be elaborated here. In addition, the adjustment shaft can adopt an airbag to inflate and clamp the shaft body to achieve adjustment of the installation length, or a screw structure can be adopted.

[0100] Through the arrangement of the above-mentioned adjustment shaft, elastic member and telescopic connecting rod, four cases can be selected;

[0101] Case 1, such as Figure 8 As shown, an elastic member is arranged between the two adjusting shafts, and the adjusting shaft controls the lifting and lowering of the pressing plate. When the adjusting shaft is blocked, the elastic member provides an external force to reset it;

[0102] Case 2, referring to Case 1, only uses two adjustment shafts and removes the elastic parts. The effect will be slightly worse than that of the case.

[0103] Case 3, such as Fig.11 As shown, an adjustment shaft is used, and multiple telescopic connecting rods are arranged around it. The adjustment shaft controls the lifting height, and the telescopic connecting rods provide a stable structure.

[0104] The detection box is provided with a pressure monitoring gauge 56 for monitoring the internal pressure thereof.

[0105] Embodiment 5: The workbench includes a fixed frame 50 and a conveyor belt 51, the first half box 2 is movably mounted on the fixed frame 50, the second half box 3 is mounted on the conveyor belt 51 and is driven to the bottom of the first half box 2, the transmission mechanism adopts a second driving member 52 fixedly mounted on the fixed frame 50, the output end of the second driving member 52 is fixedly connected to the first half box 2 and drives it to approach and move away from the second half box 3, a buffer assembly is provided between the fixed frame 50 and the upper surface of the first half box 2, the conveyor belt can be a chain or a belt, when the second half box is sent to the position directly below the first half box, the second driving member drives the first half box to move downward until the first half box and the second half box are sealed together, when the sealing is completed, the detection box is vacuumed and leak tested, and the working principle is the same as the above embodiments.

[0106] The buffer assembly includes an upper spring seat 53 fixedly mounted on the fixing frame 50, a lower spring seat 54 fixedly mounted on the first half box 2, and a spring 55 installed between the upper spring seat and the lower spring seat, which plays a buffering role, ensures the stability of the structure, and prolongs the service life.

[0107] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance and order.

[0108] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0109] Technical personnel should note that although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A differential pressure leak detection device for a packaging machine, characterized in that: It comprises a workbench, a plurality of detection boxes installed on the workbench, and a pressure difference component (1) for forming a pressure difference between the inside and outside of the detection box, wherein the workbench is provided with a transmission mechanism for controlling the switch of the detection box, and the detection box is provided with a sensor component for detecting whether a packaging bag is leaking; The detection box comprises a first half box body (2) and a second half box body (3), a pressure plate (4) for the sensing component to contact the packaging bag, a pressure sensor (5) connected to the pressure plate (4), and a base (6) for mounting the pressure sensor (5); The workbench is a rotating workbench (7); the first half box (2) is vertically slidably mounted on the rotating workbench (7); a first disc (8) is provided below the rotating workbench (7); the transmission mechanism comprises a first transmission part for driving the first half box (2) to move up and down, and a second transmission part for driving the second half box (3) to open and close; The first transmission part adopts a first inclined surface (10) arranged in the circumferential direction of the first disc (8); a first guide sleeve (11) installed vertically is provided on the rotating worktable (7); a first guide shaft (13) slidably installed in the first guide sleeve (11) is provided on the first half box (2); the first inclined surface (10) drives the first half box (2) to move up and down through the first guide shaft; and a first elastic member (16) providing a reset preload force is provided between the first half box (2) and the rotating worktable (7).

2. The pressure difference leak detection device for a packaging machine according to claim 1, characterized in that: The first transmission part adopts a first driving member (9) vertically mounted on the rotating worktable (7), and the output end of the first driving member (9) is fixedly connected to the first half box (2).

3. The pressure difference leak detection device for a packaging machine according to claim 1, characterized in that: A first bottom plate (14) is fixedly connected to the lower end of the first guide shaft (13), and a first roller (15) is provided on the first bottom plate (14) for rolling engagement with the first slope surface (10).

4. The pressure difference leak detection device for a packaging machine according to claim 2, characterized in that: The second transmission part comprises: A first bracket (17) extending radially outward from the rotary table (7) and hingedly connected to the lower surface of the second half box (3); A first mounting rod (18) fixedly mounted on the first bracket (17); A first swing arm (19), one end of which is hingedly mounted on the first mounting rod (18); A first connecting rod (20), two ends of which are respectively hinged to the second half box (3) and the first swing arm (19); A second slope surface (21) is also provided in the circumferential direction of the first disc (8); the middle position of the first swing arm (19) is in rolling engagement with the second slope surface (21).

5. The pressure difference leak detection device for a packaging machine according to claim 1, characterized in that: The first half box (2) and the second half box (3) may also be installed in the following manner: the first half box (2) is vertically slidably installed on the rotating worktable (7); a third disc (23) is provided below the rotating worktable (7); the transmission mechanism comprises a third transmission part for driving the first half box (2) to move up and down, and a fourth transmission part is provided between the first half box (2) and the second half box for driving the second half box (3) to perform synchronous switching actions; The fourth transmission part comprises: A pull rod (30), the upper end of which is hingedly mounted on the side wall of the first half box (2); A second elastic member (31) which is sleeved on the pull rod (30); A guide sleeve shaft (32) which is rotatably mounted on the side wall of the second half housing (3) and is provided with a through hole (33) for the lower end of the pull rod (30) to slide and engage with; A support (34) extending radially outward from the rotary table (7) and hingedly connected to the lower surface of the second half box (3); The upper surface of the support (34) is provided with a limiting cushion (35) for limiting the swing angle of the second half box (3).

6. The pressure difference leak detection device for a packaging machine according to claim 5, characterized in that: The third transmission part adopts a third inclined surface (24) arranged in the circumferential direction of the third disc (23); the rotary worktable (7) is provided with a third guide sleeve (25) installed vertically; the first half box (2) is provided with a third guide shaft (26) slidably installed in the third guide sleeve (25); the third inclined surface drives the first half box to move up and down through the third guide shaft (26); and a fifth elastic member (29) for providing a reset preload force is provided between the first half box (2) and the rotary worktable (7).

7. The pressure difference leak detection device for a packaging machine according to claim 6, characterized in that: A third bottom plate (27) is fixedly connected to the lower end of the third guide shaft (26), and the third bottom plate (27) is in rolling engagement with the third slope surface (24).

8. The pressure difference leak detection device for a packaging machine according to claim 1, characterized in that: A second disc (36) is provided below the rotating worktable (7); the first half housing (2) is mounted in the circumferential direction of the rotating worktable (7); and the transmission mechanism comprises a fifth transmission part for driving the second half housing (3) to switch.

9. The pressure difference leak detection device for a packaging machine according to claim 8, characterized in that: The fifth transmission unit comprises: A second bracket (37) fixedly mounted on the lower surface of the rotating worktable (7); a second mounting rod (38) vertically mounted on the second bracket (37); A second swing arm (39), one end of which is hingedly mounted on the first half box (2) and one end of which is fixedly connected to the second half box (3); A third swing arm (40), one end of which is hingedly mounted on the second mounting rod (38); A second connecting rod (41), two ends of which are respectively hinged to the second swing arm (39) and the third swing arm (40); A fourth slope surface (42) is also provided in the circumferential direction of the second disc (36); the middle position of the third swing arm (40) is in rolling engagement with the fourth slope surface (42); and a third elastic member (44) is provided between the second bracket (37) and the third swing arm (40) to connect the two.

10. The pressure difference leak detection device for a packaging machine according to claim 8, characterized in that: A clamping piece (45) is provided in the detection box.

11. The pressure difference leak detection device for a packaging machine according to claim 1, characterized in that: An adjustment shaft (49) is provided between the base (6) and the detection box, connecting the two and capable of adjusting the installation length; The detection box is provided with a pressure monitoring gauge (56) for monitoring the internal pressure thereof.

12. The pressure difference leak detection device for a packaging machine according to claim 4, characterized in that: A fourth elastic member (48) is provided between the rotating worktable (7) and the second half box (3) to connect the two.

13. The pressure difference leak detection device for a packaging machine according to claim 11, characterized in that: An elastic member (46) is provided between the base (6) and the detection box; A telescopic connecting rod (47) is also provided between the base (6) and the detection box to hinge the two.

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