Middle seal sealing device of packaging machine

Abstract

The utility model relates to a middle seal sealing device of a packaging machine, which comprises a middle seal edge sealing unit, the middle seal edge sealing unit comprises sealing wheels which are paired left and right, the middle seal edge sealing unit further comprises a rotating position adjusting frame, an angle rotating adjusting shaft and a rotating angle adjusting driving part, the sealing wheels which are paired left and right are arranged on the rotating position adjusting frame in a matched mode, and the rotating angle adjusting driving part is arranged on the rotating position adjusting frame. The rotating position adjusting frame is connected with the angle rotating adjusting shaft, the angle rotating adjusting shaft is connected to the supporting frame, the axis of the angle rotating adjusting shaft is transversely arranged, and the angle rotating adjusting shaft is in transmission connection with the rotating angle adjusting driving component. The middle seal edge sealing width can be adjusted by adjusting the inclination angles of the left sealing wheel and the right sealing wheel of the middle seal edge sealing unit, and more production requirements such as the bag body packaging tightness requirement and the edge sealing firmness requirement are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a middle seal sealing device of packaging machine. BACKGROUND

[0002] In the process of packaging materials (such as wet wipes), the packaging machine can be combined with bag-making packaging by continuous roll materials (such as continuous roll film), for example, horizontal / pillow packaging machine; wherein, when packaging, the bag body is in a horizontal state, and the upper side of the bag body is sealed by middle seal to form a sealing edge, and in the middle seal process, the left and right sealing wheels are matched to clamp the upper side of the bag body, and the left and right sealing wheels rotate to cooperate with the bag body material to advance and complete the middle seal sealing. In the middle seal sealing process, the effective area of the (left and right matched) sealing wheel clamping the upper side material of the bag body determines the width of the middle seal sealing, and after the sealing wheel is set (i.e. after the equipment is debugged), the relative position of the middle seal sealing is determined, which is difficult to change and adjust, resulting in that the width of the sealing edge cannot be adjusted, which affects the tightness of the bag body packaging and also affects the firmness of the sealing edge. SUMMARY

[0003] In view of the technical problems in the background art, the utility model aims to provide a middle seal sealing device of packaging machine capable of realizing sealing edge width adjustment.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme: a middle seal sealing device of packaging machine, comprising a middle seal sealing unit, the middle seal sealing unit comprising left and right matched sealing wheels, characterized in that: the middle seal sealing unit further comprises a rotary position adjusting frame, an angle rotary adjusting shaft and a rotary angle driving part, the left and right matched sealing wheels are matched and arranged on the rotary position adjusting frame, the rotary position adjusting frame is connected with the angle rotary adjusting shaft, the angle rotary adjusting shaft is connected and arranged on the support frame, the axis of the angle rotary adjusting shaft is horizontally arranged, and the angle rotary adjusting shaft is drivingly connected with the rotary angle driving part.

[0005] The above technical scheme can be further optimized or supplemented as follows.

[0006] For example, at least two groups of middle seal sealing units are arranged on the support frame.

[0007] Among them, the rotary position adjusting frame has a support seat, the support seat has a sealing transmission shaft, and the sealing wheels are drivingly connected to the lower end of the corresponding sealing transmission shaft; the sealing transmission shaft is drivingly connected with the sealing driving part.

[0008] For example, the sealing transmission shaft is arranged vertically on the support seat, and the sealing wheels are horizontally rotatably arranged; the sealing wheels in the middle seal sealing unit are matched with each other to roll and seal the edge, and the sealing wheels are hot sealing wheels; the rotary angle driving part is arranged on the support frame, and the support frame is arranged as a lifting adjusting frame; the support frame is connected to the rack through a lifting displacement adjusting mechanism.

[0009] In this unit, the sealing drive shafts in the middle sealing and edge sealing unit are connected to each other, and one of the sealing drive shafts in the middle sealing and edge sealing unit is connected to the sealing drive component.

[0010] Further optimization involves using a gear transmission pair to connect the sealing drive shafts. The gear transmission pair includes a left gear and a right gear. The left gear is mounted on one of the sealing drive shafts, and the right gear is mounted on the other sealing drive shaft. The left gear and the right gear mesh and transmit power.

[0011] It can also be optimized. The angle rotation adjustment shaft adopts a hollow shaft, and a rotation support part is provided on the support frame. The angle rotation adjustment shaft is configured on the rotation support part. The sealing drive component includes a power input shaft, which is configured in the angle rotation adjustment shaft. The power input shaft is connected to the sealing transmission shaft.

[0012] The power input shaft and the angle rotation adjustment shaft are provided with a rotary support bearing. The power input shaft and the angle rotation adjustment shaft are concentrically arranged. The rotary adjustment frame is connected and fixed to one end of the angle rotation adjustment shaft, and the other end of the angle rotation adjustment shaft is connected to the rotary angle adjustment drive component. The power input shaft is provided with a first bevel gear, and the sealing transmission shaft is provided with a second bevel gear. The second bevel gear meshes with the first bevel gear for transmission.

[0013] In addition, the rotary angle adjustment drive component includes a worm gear transmission mechanism; or, the rotary angle adjustment drive component includes a swing arm adjustment transmission mechanism, which includes an adjusting swing arm connected to an angle rotation adjustment shaft. One end of the adjusting swing arm is fixedly connected to the angle rotation adjustment shaft, and the other end of the adjusting swing arm is equipped with a swing arm rotation angle adjustment operation component. The swing arm rotation angle adjustment operation component includes an adjusting screw and a lifting transmission block with a threaded hole. The adjusting screw is mounted on a support frame through a screw rotation support. The threaded hole of the lifting transmission block is threadedly connected to the adjusting screw. The adjusting swing arm is provided with a swing avoidance hole and a radial transmission hole. The radial transmission hole is connected to the swing avoidance hole. The lifting transmission block is matched in the radial transmission hole, and the adjusting screw passes through the swing avoidance hole.

[0014] In order to facilitate operation, the support seat comprises a left seat and a right seat, the left seat is fixedly connected to the rotary position adjusting frame, the rotary position adjusting frame is provided with a transverse guide rod and a support side plate, the right seat is arranged on the transverse guide rod, the right seat is connected with a transverse decompression separation pull rod, the support side plate is connected to the transverse guide rod, the support side plate is located at the right side of the right seat, the transverse decompression separation pull rod is arranged on the support side plate, the right seat is further connected with a transverse compression reset spring, the transverse decompression separation pull rod is further provided with a transverse tensioning driving part; the transverse compression reset spring is arranged between the support side plate and the right seat, the transverse compression reset spring is sleeved on the transverse decompression separation pull rod, the support side plate is fixedly connected with the transverse guide rod, the transverse tensioning driving part adopts a turnover handle, the left seat is sleeved on the transverse guide rod and is fixedly connected by fastener locking connection, the right seat is further provided with a compression limiting part, the compression limiting part adopts a compression limiting adjusting screw, one end of the compression limiting adjusting screw is threadedly connected with a threaded hole on the right seat, and the head of the compression limiting adjusting screw is located outside a limiting through hole on the support side plate.

[0015] The utility model discloses the beneficial effects of, can through the inclination angle adjustment of left and right sealing wheel 2 of middle seal edge unit 1, realize middle seal edge width narrow adjustment, satisfy more production demand, such as bag body package tightness demand, edge sealing firmness demand.

[0016] The wet tissue pillow type packaging machine can also be additionally provided with a spraying device 400 at the input end of the packaging machine to spray the wet tissue material, so that the water content of the wet tissue can be prevented from being too low after the wet tissue is folded or even stacked. BRIEF DESCRIPTION OF DRAWINGS

[0017] The embodiments and examples of the utility model will be described below in combination with the drawings.

[0018] Figure 1 It is a three-dimensional structural schematic view of the packaging machine.

[0019] Figure 2 It is Figure 1 It is a partial schematic view of the back of the middle frame.

[0020] Figure 3 It is Figure 1 It is a schematic view of the middle seal sealing device in the middle frame.

[0021] Figure 4 It is Figure 3 It is a three-dimensional view of the middle frame.

[0022] Figure 5 It is Figure 4 It is another angle structural schematic view of the middle frame.

[0023] Figure 6 It is Figure 2 It is a back view of the middle frame.

[0024] Figure 7Bit Figure 6 Figure A-A cross-sectional view.

[0025] Figure:

[0026] 1, the middle of the edge unit;

[0027] 2, sealing wheel; 21, sealing transmission shaft; 22, second bevel gear; 23, left gear; 24, right gear;

[0028] 3, rotating position adjusting frame; 30, limiting through hole; 31, support seat; 32, turnover handle; 33, left seat; 34, right seat; 35, transverse guide rod; 36, support side plate; 37, horizontal displacement pressure separation pull rod; 38, horizontal displacement compression reset spring; 39, horizontal displacement tensioning driving component;

[0029] 4, angle rotating adjusting shaft;

[0030] 5, rotating angle adjusting driving component; 50, adjusting swing arm; 51, adjusting screw; 52, lifting transmission block; 53, screw rotating support; 54, swing avoidance hole; 55, radial transmission hole;

[0031] 6, support frame; 61, rotating support part;

[0032] 7, sealing driving component; 70, power input shaft; 71, first bevel gear; 72, rotating support bearing;

[0033] 8, rack. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0035] Referring to the drawings, the middle sealing device 100 of the packaging machine in the embodiment of the present application comprises a middle sealing edge unit 1, which comprises left and right paired sealing wheels 2. The left and right paired sealing wheels 2 cooperate to clamp the middle material and seal the upper side of the horizontal bag body to form a sealing edge. The sealing circumference of the sealing wheel 2 can be provided with a pattern (such as a tooth pattern, a grid pattern, etc.).

[0036] In the embodiment, further optimization is made to realize edge width adjustment, so as to adjust the tightness of the bag body package and take into account the edge firmness. The middle edge unit 1 in the embodiment further comprises a rotating position adjusting frame 3, an angle rotating adjusting shaft 4 and a rotating angle driving component 5. Specifically, the left and right matched sealing wheels 2 are arranged on the rotating position adjusting frame 3 and can rotate and adjust the position together with the rotating position adjusting frame 3. The rotating position adjusting frame 3 is connected with the angle rotating adjusting shaft 4, and the angle rotating adjusting shaft 4 can drive the rotating position adjusting frame 3 to rotate and adjust the angle, so as to adjust the angle position. The angle rotating adjusting shaft 4 is connected with the supporting frame 6, and the supporting frame 6 supports the angle rotating adjusting shaft 4 and the rotating position adjusting frame 3 connected therewith. The supporting frame 6 can support the whole middle edge unit 1. The axis of the angle rotating adjusting shaft 4 is arranged horizontally (horizontal refers to the left-right horizontal direction). The angle rotating adjusting shaft 4 is in transmission connection with the rotating angle driving component 5, and the rotating angle driving component 5 drives the angle rotating adjusting shaft 4 to rotate and adjust the angle.

[0037] The working principle is that the bag body material advances from front to back and is sealed by the left and right matched sealing wheels 2. On the premise that the middle edge of the bag body is formed, the angle rotating adjusting shaft 4 is driven by the rotating angle driving component 5 to adjust the angle and adjust the angle position, so that the rotating position adjusting frame 3 is adjusted to rotate and adjust the angle, and finally the inclination angle (i.e. the angle of upward inclination along the advancing direction of the bag body material) of the left and right matched sealing wheels 2 is adjusted, so that the middle edge position of the bag body material clamped and pulled upward and rotated by the left and right sealing wheels 2 (rotation) is adjusted. The greater the upward inclination angle, the more obvious the upward pulling effect, and the wider the middle edge (the greater the range of the sealed edge). The smaller the upward inclination angle, the weaker the upward pulling effect, and the narrower the middle edge width. Without inclination (i.e. the sealing wheel 2 rotates in the horizontal plane), the middle edge width is narrower.

[0038] In the middle edge sealing device of the packaging machine, the inclination angle of the left and right sealing wheels 2 of the middle edge unit 1 can be adjusted to adjust the width of the middle edge, so as to meet more production requirements, such as the tightness of the bag body package and the firmness of the edge.

[0039] The wet wipe pillow type packaging machine can also be additionally provided with a spray 400 at the input end of the packaging machine to spray the wet wipe material. After the wet wipe is folded or even stacked, the water content of the wet wipe can be prevented from being too low.

[0040] The following optimizations or further explanations can be made on the basis of the above embodiments.

[0041] For example, at least two groups of middle sealing and edge sealing units 1 are arranged on the support frame 6. Multiple groups of middle sealing and edge sealing units 1 are arranged in front and back, and the left and right matched sealing wheels 2 in the middle sealing and edge sealing units 1 are matched in front and back, and the upward inclined angle can gradually increase, and can gradually pull up, and the effect is better, and the sealing is gradually and gradually sealed, and the sealing effect is better and more stable, and the problem of too large inclination angle and unable to smoothly and stably seal is avoided.

[0042] The rotation position adjusting frame 3 has a support seat 31, the support seat 31 has a sealing transmission shaft 21, the sealing wheels 2 are respectively connected to the lower ends of the corresponding sealing transmission shafts 21, the rotation position adjusting frame 3 is supported by the support shaft to support the sealing transmission shaft 21 to rotate, thereby driving the sealing wheels 2 at the lower end to rotate and operate, and cooperating with sealing and pulling. The sealing transmission shaft 21 is in transmission connection with the sealing driving part 7, and the sealing transmission shaft 21 is driven to rotate by the sealing driving part 7, and the sealing transmission shaft 21 is driven to rotate on the support seat 31 in a corresponding manner. There are many ways to drive the sealing transmission shaft 21 to rotate on the support seat 31.

[0043] The sealing transmission shaft 21 is arranged vertically on the support seat 31, and the sealing transmission shaft 21 rotates around its axis, that is, the axis of the sealing transmission shaft 21 is vertically arranged on the support seat 31, and the angle rotation adjusting shaft 4 is used for rotating and adjusting the position, the rotation position adjusting frame 3 and the support seat 31 are rotated and adjusted together, and the axis of the sealing transmission shaft 21 will be inclined and inclined with them, that is, the axis of the sealing transmission shaft 21 is not perpendicular to the horizontal plane. The sealing wheels 2 are horizontally rotatable sealing wheels. The sealing wheels 2 in the middle sealing and edge sealing units 1 are mutually matched and rolled to seal the edges, and the left and right sealing wheels 2 can clamp the material and move forward to cooperate with sealing, and the sealing wheels 2 can be hot sealing wheels (such as cooperating with an electric heating ring). When multiple groups of middle sealing and edge sealing units 1 are arranged, at least one group uses a hot sealing method to cooperate with edge sealing. Additional heating copper blocks can be arranged between the multiple groups of middle sealing and edge sealing units 1 to heat the material below. In addition, the rotation angle driving part 5 can be arranged on the support frame 6 and supported together; or the support frame 6 can be arranged as a lifting adjusting frame, which can adjust the overall height of the middle sealing and edge sealing unit 1 to match the overall thickness of the bag body, and has more freedom and is more practical; for example, the support frame 6 is connected to the rack 8 through a lifting displacement adjusting mechanism. The lifting displacement adjusting mechanism has many forms, and can be manually or electrically (such as being provided with a motor, for example, a servo motor is used for cooperation and driving to realize accurate and automatic control), and can use a screw and nut structure, a gear and rack structure, or a belt and pulley structure for transmission.

[0044] The sealing transmission shaft 21 in the middle sealing edge unit 1 can be directly connected with the sealing transmission shaft 21, and one sealing transmission shaft 21 in the middle sealing edge unit 1 is connected with the sealing driving part 7 in transmission. There are many transmission connection modes, for example, the sealing transmission shaft 21 and the sealing transmission shaft 21 are connected in transmission by a gear transmission pair. For example, the gear transmission pair includes a left gear 23 and a right gear 24. The left gear 23 is arranged on one sealing transmission shaft 21, and the right gear 24 is arranged on the other sealing transmission shaft 21. The left gear 23 and the right gear 24 are in meshing transmission connection.

[0045] In addition, the angle rotation adjustment shaft 4 can adopt a hollow rotating shaft, the support frame 6 is provided with a rotating support part 61, the angle rotation adjustment shaft 4 is arranged on the rotating support part 61, and the angle rotation adjustment shaft 4 is stably rotated and adjusted in the angle position by being supported on the support frame 6 by the rotating support part 61; for example, the sealing driving part 7 comprises a power input rotating shaft 70, the power input rotating shaft 70 is arranged in the angle rotation adjustment shaft 4 (i.e. the hollow rotating shaft), the power input rotating shaft 70 is in transmission connection with the sealing transmission rotating shaft 21, power is transmitted to the sealing transmission rotating shaft 21 by the power input rotating shaft 70, so as to drive the sealing transmission rotating shaft 21 to rotate, the power input rotating shaft 70 can be supported by the angle rotation adjustment shaft 4, the two shafts (the power input rotating shaft 70 and the angle rotation adjustment shaft 4) can rotate as required, and the sealing wheel 2 can be driven to rotate and the angle position can be adjusted. In this structure, power is input by the power input rotating shaft 70, the power source of the power input rotating shaft 70 does not need to be arranged on the support frame 6, the load of the support frame 6 is relatively low, and the angle rotation adjustment and the adjustment of the angle position are facilitated. Further optimization can be made, a rotating support bearing 72 is arranged between the power input rotating shaft 70 and the angle rotation adjustment shaft 4, the power input rotating shaft 70 and the angle rotation adjustment shaft 4 are arranged concentrically, i.e. the power input rotating shaft 70 is also arranged transversely, the rotating adjustment frame 3 is connected and fixed to one end of the angle rotation adjustment shaft 4, the other end of the angle rotation adjustment shaft 4 is connected with the rotating angle driving part 5; wherein the power input rotating shaft 70 is provided with a first bevel gear 71, the sealing transmission rotating shaft 21 is provided with a second bevel gear 22, the second bevel gear 22 is in meshing transmission connection with the first bevel gear 71, power input is met, and the angle rotation adjustment can be smoothly completed, the rotating adjustment frame 3 and the angle rotation adjustment shaft 4 are adjusted in the angle, and the structure is more reasonable. In addition, each power input rotating shaft 70 can be driven by a corresponding motor (the motor can be connected to the lifting plate of the machine frame 8 so as to be lifted together with the lifting adjustment frame) or be connected with the motor 80 of the main machine, for example, the motor of the packaging machine is connected with each other by a synchronous belt, each power input rotating shaft 70 can be driven together, a pulley 82 is arranged on the power input rotating shaft 70 for transmission connection with the synchronous belt 84, each power input rotating shaft 70 can be arranged on the pulley set (the pulley 82 and the pulley 83) of the lifting plate 81 of the machine frame 8 for transmission, so that the motor 80 can be smoothly transmitted without lifting. The power input rotating shafts 70 can be connected with each other.

[0046] The rotation angle driving part 5 cooperates with the angle rotation adjusting shaft 4 to rotate, and the cooperation realizes the angle rotation adjustment in many ways. The rotation angle driving part 5 can include a motor (such as a servo motor) in transmission connection with the angle rotation adjusting shaft 4. For another example, the rotation angle driving part 5 includes a worm gear transmission mechanism, wherein the worm gear can be sleeved on the angle rotation adjusting shaft 4, and the worm can be manually operated by a tool or driven by a motor. Alternatively, the rotation angle driving part 5 includes a swing arm adjusting transmission mechanism, which includes an adjusting swing arm 50 connected with the angle rotation adjusting shaft 4. The angle rotation adjustment of the angle rotation adjusting shaft 4 is realized by controlling the swing of the adjusting swing arm 50. One end of the adjusting swing arm 50 is fixedly connected with the angle rotation adjusting shaft 4, and the other end of the adjusting swing arm 50 is provided with a swing arm rotation angle adjusting operation part for controlling the swing of the adjusting swing arm 50. For example, the swing arm rotation angle adjusting operation part includes an adjusting screw 51 and a lifting transmission block 52 with a threaded hole. The adjusting screw 51 is arranged on the support frame 6 through a screw rotation support 53, and can be vertically arranged or horizontally arranged for convenient operation and rotation. The screw rotation support 53 cooperates with the adjusting screw 51 to rotate and support. The threaded hole of the lifting transmission block 52 is in threaded connection with the adjusting screw 51, and the adjusting screw 51 can cooperate with the lifting transmission block 52 to lift. The adjusting swing arm 50 is provided with a swing avoiding hole 54 and a radial transmission hole 55. The lifting transmission block 52 is matched in the radial transmission hole 55, the adjusting screw 51 passes through the swing avoiding hole 54, and the radial transmission hole 55 is in communication (forms a channel) with the swing avoiding hole 54, so that the lifting transmission block 52 can cooperate with the adjusting swing arm 50 to lift. The lifting transmission block 52 can relatively displace in the radial transmission hole 55 during the lifting process.

[0047] In addition, the left and right matched sealing wheels 2 can have different states, such as a closing state for closing and pressing (for clamping and rolling the material edge) and a separating state for separating and releasing (for arranging the material, etc.). For example, the support seat 31 includes a left seat 33 and a right seat 34. The left seat 33 is fixedly connected to the rotating adjusting frame 3, which has a transverse guide rod 35 and a support side plate 36. The right seat 34 is arranged on the transverse guide rod 35 and can move laterally on the transverse guide rod 35 to approach and separate from the left seat 33, so that the corresponding sealing wheels 2 approach and separate from each other to realize state switching. The right seat 34 is connected to a lateral displacement and release pressing release rod 37, which cooperates with the right seat 34 to drive (pull) the lateral displacement and release pressing release rod 37 to move laterally and release pressing. The support side plate 36 is connected to the transverse guide rod 35 and is located to the right of the right seat 34. The lateral displacement and release pressing release rod 37 is arranged on the support side plate 36 for operation. The right seat 34 is also connected to a lateral displacement and pressing reset spring 38. After the lateral displacement and pressing release rod is released from the pulling and moving state, the lateral displacement and pressing reset spring 38 resets the right seat 34 to approach the left seat 33, and the sealing wheels 2 approach and press each other. The lateral displacement and release pressing release rod 37 is also provided with a lateral displacement and tension driving component 39, which cooperates with the lateral displacement and release pressing release rod 37 to operate. The lateral displacement and pressing reset spring 38 is arranged between the support side plate 36 and the right seat 34, and can be sleeved on the lateral displacement and release pressing release rod 37 to be relatively stable. The support side plate 36 is fixedly connected to the transverse guide rod 35.

[0048] The lateral displacement and tension driving component 39 adopts a turnover handle 32. The left seat 33 is sleeved on the transverse guide rod 35 and is fixedly connected by a fastener to achieve position adjustment by tightening. The right seat 34 can also be provided with a pressing limiting component. When the lateral displacement and pressing reset spring 38 approaches the left seat 33, the pressing limiting component cooperates with the right seat 34 to limit the position and the pressing force, so as to adjust to the appropriate edge sealing effect. For example, the pressing limiting component adopts a pressing limiting adjustment screw. One end of the pressing limiting adjustment screw is threadedly connected to a threaded hole 300 on the right seat 34. The head of the pressing limiting adjustment screw is located outside a limiting through hole 30 on the support side plate 36. By rotating the pressing limiting adjustment screw, the corresponding adjustment is realized. That is, the pressing limiting adjustment screw is connected to the threaded hole 300 on the right seat 34 after passing through the limiting through hole 30, and the head is limited by the limiting through hole 30.

Claims

1. The middle seal sealing device of a packaging machine, comprising a middle seal sealing unit (1), the middle seal sealing unit (1) comprising left and right sealing wheels (2) matched with each other, characterized in that: the middle seal sealing unit (1) further comprises a rotating position adjusting frame (3), an angle rotating adjusting shaft (4) and a rotating angle adjusting driving part (5), the left and right sealing wheels (2) are arranged on the rotating position adjusting frame (3) in a matched manner, the rotating position adjusting frame (3) is connected with the angle rotating adjusting shaft (4), the angle rotating adjusting shaft (4) is arranged on a support frame (6) in a connected manner, the axis of the angle rotating adjusting shaft (4) is arranged horizontally, and the angle rotating adjusting shaft (4) is connected with the rotating angle adjusting driving part (5) in a transmission manner. At least two groups of the middle seal sealing units (1) are arranged on the support frame (6) in a front and back manner. The rotating position adjusting frame (3) is provided with a supporting seat (31), the supporting seat (31) is provided with a sealing transmission shaft (21), and the sealing wheels (2) are respectively connected with the lower ends of the corresponding sealing transmission shafts (21) in a transmission manner; the sealing transmission shafts (21) are connected with the sealing driving part (7) in a transmission manner.

2. The central-seal sealing device of a packaging machine according to claim 1, characterized in that: The sealing transmission shafts (21) are arranged vertically on the supporting seat (31), and the sealing wheels (2) are arranged in a horizontal sealing manner.

3. The central sealing device of a packaging machine according to claim 1, characterized in that: The sealing wheels (2) in the middle seal sealing unit (1) are matched with each other in a rolling sealing manner, and the sealing wheels (2) are heat sealing wheels.

4. The central sealing device of a packaging machine according to claim 3, characterized in that: The rotating angle adjusting driving part (5) is arranged on the support frame (6), and the support frame (6) is arranged as a lifting adjusting frame. The support frame (6) is connected with the machine frame (8) through a lifting displacement adjusting mechanism. The sealing transmission shafts (21) in the middle seal sealing unit (1) are connected with each other in a transmission manner, and one of the sealing transmission shafts (21) in the middle seal sealing unit (1) is connected with the sealing driving part (7) in a transmission manner.

6. The middle seal sealing device of the packaging machine according to claim 5, characterized in that:

5. The central sealing device of a packaging machine according to claim 3, characterized in that: The sealing transmission shafts (21) are connected with each other in a gear transmission pair transmission manner. The gear transmission pair comprises a left gear (23) and a right gear (24), the left gear (23) is arranged on one of the sealing transmission shafts (21), the right gear (24) is arranged on the other sealing transmission shaft (21), and the left gear (23) is connected with the right gear (24) in a meshing transmission manner. The angle rotating adjusting shaft (4) is a hollow shaft, the support frame (6) is provided with a rotating support part (61), the angle rotating adjusting shaft (4) is arranged on the rotating support part (61), the sealing driving part (7) comprises a power input shaft (70), the power input shaft (70) is arranged in the angle rotating adjusting shaft (4), and the power input shaft (70) is connected with the sealing transmission shaft (21) in a transmission manner. The power input shaft (70) and the angle rotating adjusting shaft (4) are provided with a rotating support bearing (72), the power input shaft (70) and the angle rotating adjusting shaft (4) are arranged concentrically, 7. The machine for middle sealing and sealing according to claim 3 or 5, characterized in that: The rotating position adjusting frame (3) is connected and fixed to one end of the angle rotating adjusting shaft (4), the other end of the angle rotating adjusting shaft (4) is connected with the rotating angle adjusting driving part (5); 8. The machine for packaging according to claim 7, characterized in that: The power input shaft (70) is provided with a first bevel gear (71), ​ ​ The second bevel gear (22) is arranged on the sealing transmission shaft (21) and is engaged with the first bevel gear (71) to realize transmission.

9. The middle sealing and sealing device of the packaging machine according to claim 1, characterized in that: The rotation angle adjusting driving part (5) comprises a worm gear transmission mechanism. The rotation angle adjusting driving part (5) comprises a swing arm adjusting transmission mechanism, which comprises an adjusting swing arm (50) connected with the angle rotation adjusting shaft (4). One end of the adjusting swing arm (50) is fixedly connected with the angle rotation adjusting shaft (4), and the other end of the adjusting swing arm (50) is provided with a swing arm rotation angle adjusting operating part. The swing arm rotation angle adjusting operating part comprises an adjusting screw (51) and a lifting transmission block (52) with a threaded hole. The adjusting screw (51) is arranged on the support frame (6) through a screw rotation support (53), and the threaded hole of the lifting transmission block (52) is threadedly connected with the adjusting screw (51). The adjusting swing arm (50) is provided with a swing avoiding hole (54) and a radial transmission hole (55) in communication with the swing avoiding hole (54). The lifting transmission block (52) is matched in the radial transmission hole (55). The adjusting screw (51) passes through the swing avoiding hole (54).

10. The central sealing and sealing device of a packaging machine according to claim 3, characterized in that: The support seat (31) comprises a left seat (33) and a right seat (34). The left seat (33) is fixedly connected with the rotation position adjusting frame (3). The rotation position adjusting frame (3) has a transverse guide rod (35) and a support side plate (36), the right seat (34) is arranged on the transverse guide rod (35), the right seat (34) is connected with a transverse retraction separation pull rod (37), the support side plate (36) is connected with the transverse guide rod (35), and the support side plate (36) is located on the right side of the right seat (34). The transverse retraction separation pull rod (37) is arranged on the support side plate (36), the right seat (34) is further connected with a transverse compression resetting spring (38), and the transverse retraction separation pull rod (37) is further provided with a transverse tensioning driving part (39). The transverse compression resetting spring (38) is arranged between the support side plate (36) and the right seat (34), is sleeved on the transverse retraction separation pull rod (37), and the support side plate (36) is fixedly connected with the transverse guide rod (35). The transverse tensioning driving part (39) adopts a turnover handle (32), the left seat (33) is sleeved on the transverse guide rod (35) and is fixedly connected by a fastener locking connection. The right seat (34) is further provided with a compression limiting part, the compression limiting part adopts a compression limiting adjusting screw, one end of the compression limiting adjusting screw is threadedly connected with a threaded hole on the right seat (34), and the head of the compression limiting adjusting screw is located on the outside of a limiting through hole (30) on the support side plate (36).

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