Inner bag folding mechanism of automatic powder packaging machine

Abstract

The invention provides an inner bag folding mechanism of an automatic powder packaging machine. The inner bag folding mechanism solves the problem that an existing inner bag folding mechanism is poor in paper tape folding effect. The device comprises a bottom plate, a left baffle and a right baffle, a first through groove is formed in the lower portion of the left baffle, a second through groove is formed in the lower portion of the right baffle, a concave cavity is formed in the bottom plate, a supporting plate is arranged in the concave cavity in a sliding fit mode, a buffering assembly is arranged below the supporting plate, and the upper surface of the supporting plate is flush with the upper surface of the bottom plate under the action of the buffering assembly. A pressing block capable of ascending and descending is arranged between the left baffle and the right baffle, and a first sliding block used for abutting against the left side face of the concave cavity after the pressing block presses the supporting plate into the concave cavity, a second sliding block used for abutting against the right side face of the concave cavity and a driving structure used for driving the first sliding block and the second sliding block to act are arranged in the pressing block. The folding marks can be formed between the first side attaching section and the bottom attaching section of the paper tape and between the second side attaching section and the bottom attaching section of the paper tape, the first side attaching section and the second side attaching section cannot be turned upwards after the paper tape is folded, and the folding effect is good.

Description

Technical Field

[0001] The present invention belongs to the technical field of pharmaceutical packaging equipment and relates to an inner bag folding mechanism of a powder automatic packaging machine. Background Art

[0002] A Chinese patent discloses a secondary paper folding mechanism for the inner bag of a powder automatic packaging machine [authorization announcement number: CN209305960U], which includes a frame with a horizontal support surface, a first baffle perpendicular to the horizontal support surface provided on the frame, and a second baffle opposite to and parallel to the first baffle. A U-shaped groove is formed between the first baffle and the second baffle. A pressing block for pressing a paper tape straddling between the first baffle and the second baffle into the U-shaped groove is provided on the workbench. The paper tape pressed into the U-shaped groove includes a bottom abutting section abutting against the horizontal support surface, a first side abutting section abutting against the first baffle, and a second side abutting section abutting against the second baffle. A pushing plate for making the first side abutting section, the second side abutting section, and the bottom abutting section abut against each other is also provided on the frame.

[0003] In order to prevent the pressed pressing block from lifting the paper tape upward, gaps are required between the pressing block and the first baffle and the second baffle, which will cause the pressing block not to squeeze the joints of the first side abutting section and the second side abutting section with the bottom abutting section well when pressing in, that is, no creases can be formed between the first side abutting section and the bottom abutting section and between the second side abutting section and the bottom abutting section, and the folding effect is poor. When the folded paper tape is pushed out by the second through groove, the first side abutting section and the second side abutting section will expand outward at a certain angle due to the tension, which is not conducive to loading it into the outer packaging bag. Moreover, due to the existence of the first through groove and the second through groove, the paper tape is in a hollow state at the positions of the first through groove and the second through groove during the folding process, which is not conducive to the formation of creases. Summary of the Invention

[0004] The purpose of the present invention is to address the above problems existing in the prior art and propose an inner bag folding mechanism of a powder automatic packaging machine with good paper folding effect.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The inner bag folding mechanism of the automatic powder packaging machine comprises a bottom plate, a left baffle plate and a right baffle plate vertically arranged on the bottom plate, the left baffle plate and the right baffle plate are parallel and oppositely arranged, the lower part of the left baffle plate is provided with a through groove 1 whose lower side surface is flush with the upper surface of the bottom plate, the lower part of the right baffle plate is provided with a through groove 2 whose lower side surface is flush with the upper surface of the bottom plate, the bottom plate is provided with a concave cavity, the left side surface of the concave cavity is flush with the right side surface of the left baffle plate, the right side surface of the concave cavity is flush with the left side surface of the right baffle plate, and the concave cavity is slidably fitted There is a support plate, and a buffer assembly is provided under the support plate. Under the action of the buffer assembly, the upper surface of the support plate is flush with the upper surface of the bottom plate. A pressure block that can be raised and lowered is provided between the left baffle plate and the right baffle plate, and the left and right width of the pressure block is smaller than the distance between the left baffle plate and the right baffle plate. A slider 1 is provided in the pressure block for abutting against the left side surface of the concave cavity when the pressure block presses the support plate into the concave cavity, a slider 2 is provided for abutting against the right side surface of the concave cavity, and a driving structure for driving the slider 1 and the slider 2 to move.

[0007] The paper tape coming from the upstream spans over the left baffle and the right baffle, and then the pressure block presses the paper tape into the space between the left baffle and the right baffle. As the pressure block further descends, it pushes the support plate down until the support plate cannot descend anymore. At this time, the driving structure drives slider 1 and slider 2 to extend and respectively rest against the left and right sides of the cavity. An extrusion blade is formed between the left side and the lower surface of slider 1, which squeezes the area of ​​the paper tape between the side abutment section 1 and the bottom abutment section, forming a crease. Similarly, an extrusion blade is formed between the right side and the lower surface of slider 2, which squeezes the area of ​​the paper tape between the side abutment section 2 and the bottom abutment section, forming a crease.

[0008] In the inner bag folding mechanism of the above-mentioned automatic powder packaging machine, a T-shaped groove extending in the left-right direction is provided on the lower surface of the pressing block, and the slider 1 and the slider 2 are slidably fitted in the T-shaped groove. A clearance cavity connected to the T-shaped groove is provided above the T-shaped groove, and the upper ends of the slider 1 and the slider 2 extend into the clearance cavity respectively. A spring 1 capable of driving the slider 1 to move to the right is provided between the slider 1 and the right side of the clearance cavity, and a spring 2 capable of driving the slider 2 to move to the left is provided between the slider 2 and the left side of the clearance cavity.

[0009] Under the action of spring 1 and spring 2, slider 1 and slider 2 are located in the T-shaped groove. At this time, the distance from the left side of slider 1 to the right side of slider 2 is smaller than the distance between baffle 1 and baffle 2. Spring 1 and spring 2 are of the same model. The driving structure can overcome the elastic force of spring 1 and spring 2, so that slider 1 moves to the left and slider 2 moves to the right.

[0010] In the inner bag folding mechanism of the above-mentioned automatic powder packaging machine, the said give way cavity has a guide rod extending in the left-right direction, and the said guide rod is two and is respectively arranged close to the front and rear sides of the give way cavity, and the said slider 1 and the slider 2 are slidably sleeved on the guide rod, and the said spring 1 and spring 2 are respectively sleeved on the same said guide rod.

[0011] The guide rod can not only guide the slider 1 and the slider 2, but also limit the spring 1 and the spring 2 to prevent the spring 1 and the spring 2 from falling off.

[0012] In the inner bag folding mechanism of the above-mentioned automatic powder packaging machine, a guide cavity connected to the give way cavity is provided at the top of the give way cavity, a through hole penetrating upwardly through the pressure block is provided at the upper part of the guide cavity, the driving structure includes a push block slidably fitted in the guide cavity and a push rod slidably fitted in the through hole, the lower end of the push rod is fixedly connected to the push block, a guide surface 1 is provided on the right side of the slider 1, a guide surface 2 is provided on the left side of the slider 2, and the maximum distance between the guide surface 1 and the guide surface 2 is greater than the left and right width of the lower end of the push block.

[0013] The diameter of the through hole is smaller than the minimum width of the guide cavity cross section to prevent the push block from coming out of the through hole. When the push block is pressed down, it squeezes the guide surface 1 and the guide surface 2 respectively, so that the slider 1 moves to the left along the T-slot, and the slider 2 moves to the right along the T-slot.

[0014] In the inner bag folding mechanism of the above-mentioned automatic powder packaging machine, a limiting flange is provided at the upper end of the push rod, a spring three is sleeved on the push rod, the upper end of the spring three acts on the limiting flange, and the lower end of the spring three acts on the pressing block.

[0015] Under the action of spring three, the push block abuts against the upper surface of the guide cavity. At this time, when the push rod is pressed down, it will drive the pressure block, slider one and slider two to move downward together. When the lower surface of the pressure block abuts against the upper surface of the bottom plate, the push rod continues to move downward until the support plate abuts against the bottom of the concave cavity. In this process, the push block squeezes slider one and slider two to make them move to both sides along the T-shaped groove until the left side of slider one abuts against the right side of the concave cavity, and the right side of slider two abuts against the right side of the concave cavity, so that the bottom abutting section, side abutting section one and side abutting section two are respectively pressed, and creases are formed at the connection between the side abutting section one and the bottom abutting section and the connection between the side abutting section two and the bottom abutting section.

[0016] The push block is located between the two guide rods, and the push block will not touch the guide rods when it moves up and down.

[0017] In the inner bag folding mechanism of the above-mentioned automatic powder packaging machine, the buffer assembly includes a plurality of springs four arranged at the bottom of the cavity, and the upper ends of the springs four act on the support plate. The plurality of springs four are of the same model and are evenly distributed, which can ensure that the upper surface of the support plate is flush with the upper surface of the bottom plate.

[0018] In the inner bag folding mechanism of the above powder automatic packaging machine, a plurality of mounting holes corresponding to the fourth spring one by one are provided at the bottom of the concave cavity, the fourth spring is arranged in the corresponding mounting hole, and the free length of the fourth spring is greater than the depth of the mounting hole.

[0019] When the lower surface of the support plate abuts against the bottom of the concave cavity, the support plate cannot continue to descend. At this time, the downward movement of the push rod will drive the first slider to move leftward and the second slider to move rightward, and the fourth spring will completely enter the mounting hole.

[0020] After the paper tape forms a crease, it passes through the push plate from the first through groove. The push plate presses the first side abutting section against the bottom abutting section. Subsequently, the push plate abuts against the crease between the second side abutting section and the bottom abutting section and extends out from the second through groove. At this time, under the action of the push plate and the right baffle, the second side abutting section is made to abut against the upper side of the first side abutting section.

[0021] In the inner bag folding mechanism of the above powder automatic packaging machine, a horizontally extending first V-shaped groove is provided on the left baffle, a second V-shaped groove corresponding to the first V-shaped groove is provided on the right baffle, a V-shaped conveying groove extending in the left-right direction is provided at the front side of the first V-shaped groove and the second V-shaped groove, a push paper board is provided above the V-shaped conveying groove, and the rear end of the push paper board has a V-shaped portion cooperating with the first V-shaped groove / the second V-shaped groove.

[0022] The paper tape is conveyed by the V-shaped conveying groove. The push paper board pushes the paper tape along the middle of the height of the paper tape, so that the middle of the paper tape enters the first V-shaped groove and the second V-shaped groove, is folded into a V shape across the left baffle and the right baffle, and is then pressed by the pressing block.

[0023] In the inner bag folding mechanism of the above powder automatic packaging machine, a support block that can move back and forth is provided at the rear side of the first V-shaped groove and the second V-shaped groove. The support block has a third V-shaped groove cooperating with the V-shaped portion. When the support block moves forward to the maximum position, the third V-shaped groove is aligned with the first V-shaped groove / the second V-shaped groove in the left-right direction.

[0024] The support block and the push paper board act synchronously. When the push paper board moves backward, the support block moves forward. When the push paper board moves forward, the support block moves backward. The two act together to fold the support plate.

[0025] Compared with the prior art, the inner bag folding mechanism of this powder automatic packaging machine has the following advantages:

[0026] Due to the provision of the first slider, the second slider and the driving structure, creases can be formed between the first side abutting section and the bottom abutting section of the paper tape, as well as between the second side abutting section and the bottom abutting section. When the paper tape is folded, the first side abutting section and the second side abutting section will not turn up, and the folding effect is good. A support plate is arranged in the concave cavity of the bottom plate to prevent the crease of the paper tape from being in a hollow state, further improving the folding effect. The first slider and the second slider are driven by the push rod of the driving pressing block, eliminating the need for additional structures, and the overall structure is reasonably designed and ingenious. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the inner bag folding mechanism in the first state.

[0028] Figure 2 is Figure 1 a front-to-back sectional view of the inner bag folding mechanism in

[0029] Figure 3 is Figure 1 a left-to-right sectional view of the inner bag folding mechanism in

[0030] Figure 4 is a schematic structural diagram of the inner bag folding mechanism in the second state.

[0031] Figure 5 is a schematic structural diagram of the inner bag folding mechanism in the third state.

[0032] Figure 6 is Figure 5 a left-to-right sectional view of the inner bag folding mechanism in

[0033] Figure 7 is a schematic structural diagram of the inner bag folding mechanism in the fourth state.

[0034] Figure 8 is Figure 7 a left-to-right sectional view of the inner bag folding mechanism in

[0035] Figure 9 is a process diagram of the paper tape being folded under the action of the pressing block.

[0036] In the figure, 1. bottom plate; 2. left baffle; 3. right baffle; 4. first through groove; 5. second through groove; 6. concave cavity; 7. support plate; 8. pressing block; 9. first slider; 10. second slider; 11. T-shaped groove; 12. relief cavity; 13. first spring; 14. second spring; 15. guide rod; 16. guide cavity; 17. push block; 18. push rod; 19. limit flange; 20. third spring; 21. fourth spring; 22. mounting hole; 23. first V-shaped groove; 24. second V-shaped groove; 25. V-shaped conveying groove; 26. push paper board; 27. support block; 28. third V-shaped groove; a. paper tape; a1. first side abutting section; a2. second side abutting section; a3. bottom abutting section. Detailed implementation manners

[0037] The following are specific embodiments of the present invention. In combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0038] As Figure 1 shown, the inner bag folding mechanism of the powder automatic packaging machine includes a bottom plate 1, a left baffle 2 and a right baffle 3 vertically arranged on the bottom plate 1. The left baffle 2 and the right baffle 3 are parallel and opposite to each other. A through groove 4 with a lower side flush with the upper surface of the bottom plate 1 is provided at the lower part of the left baffle 2, and a through groove 5 with a lower side flush with the upper surface of the bottom plate 1 is provided at the lower part of the right baffle 3. The through groove 4 and the through groove 5 are opposite to each other, and the push plate extending from the through groove 4 can extend out from the through groove 5.

[0039] As Figure 2 and Figure 3 shown, a concave cavity 6 is provided on the bottom plate 1. The left side surface of the concave cavity 6 is flush with the right side surface of the left baffle 2, and the right side surface of the concave cavity 6 is flush with the left side surface of the right baffle 3. A support plate 7 is slidably fitted in the concave cavity 6. A buffer assembly is provided below the support plate 7. Under the support of the buffer assembly, the upper surface of the support plate 7 is flush with the upper surface of the bottom plate 1.

[0040] As Figure 2 and Figure 3 shown, the buffer assembly includes a plurality of spring fours 21 provided at the bottom of the concave cavity 6. The upper ends of the spring fours 21 act on the support plate 7. The models of the multiple spring fours 21 are the same and are evenly distributed, which can ensure that the upper surface of the support plate 7 is flush with the upper surface of the bottom plate 1.

[0041] In order to position the spring four 21, as Figure 2 and Figure 3 shown, a plurality of mounting holes 22 corresponding to the spring four 21 one by one are provided at the bottom of the concave cavity 6. The spring four 21 is arranged in the corresponding mounting hole 22. The free length of the spring four 21 is greater than the depth of the mounting hole 22. When the lower surface of the support plate 7 abuts against the bottom of the concave cavity 6, the support plate 7 cannot continue to descend, and the spring four 21 completely enters the mounting hole 22.

[0042] As Figures 1 - 8 shown, a vertically movable pressing block 8 is provided between the left baffle 2 and the right baffle 3. The left and right widths of the pressing block 8 are smaller than the distance between the left baffle 2 and the right baffle 3. As Figure 3 , 6 and Figure 8 shown, the pressing block 8 is provided with a slider one 9 for abutting against the left side surface of the concave cavity 6, a slider two 10 for abutting against the right side surface of the concave cavity 6, and a driving structure for driving the slider one 9 and the slider two 10 to act after the pressing block 8 presses the support plate 7 into the concave cavity 6.

[0043] An extrusion edge is formed between the left side surface and the lower surface of the first slider 9, which squeezes the area of the paper tape a between the first side attachment section a1 and the bottom attachment section a3 to form a crease. Similarly, an extrusion edge is formed between the right side surface and the lower surface of the second slider 10, which squeezes the area of the paper tape a between the second side attachment section a2 and the bottom attachment section a3 to form a crease.

[0044] In this embodiment, a T-shaped groove 11 extending in the left-right direction is provided on the lower surface of the pressing block 8. The first slider 9 and the second slider 10 are slidably fitted in the T-shaped groove 11. A relief cavity 12 communicating with the T-shaped groove 11 is provided above the T-shaped groove 11. The upper ends of the first slider 9 and the second slider 10 respectively extend into the relief cavity 12. A first spring 13 capable of driving the first slider 9 to move to the right is provided between the first slider 9 and the right side of the relief cavity 12, and a second spring 14 capable of driving the second slider 10 to move to the left is provided between the second slider 10 and the left side of the relief cavity 12.

[0045] Under the action of the first spring 13 and the second spring 14, the first slider 9 and the second slider 10 are located in the T-shaped groove 11. At this time, the distance from the left side surface of the first slider 9 to the right side surface of the second slider 10 is less than the distance between the first baffle and the second baffle. The first spring 13 and the second spring 14 are of the same model. The driving structure can overcome the elastic forces of the first spring 13 and the second spring 14 to make the first slider 9 move to the left and the second slider 10 move to the right.

[0046] As Figure 2 、 Figure 3 and Figure 6 As shown in

[0047] As Figure 3 、 Figure 6 and Figure 8As shown, the top of the clearance cavity 12 is provided with a guide cavity 16 connected with the clearance cavity 12, and the upper part of the guide cavity 16 is provided with a through hole that penetrates the pressure block 8 upward. The driving structure includes a push block 17 that slides in the guide cavity 16 and a push rod 18 that slides in the through hole. The lower end of the push rod 18 is fixedly connected to the push block 17. The right side of the slider 1 9 is provided with a guide surface 1, and the left side of the slider 2 10 is provided with a guide surface 2. The maximum distance between the guide surface 1 and the guide surface 2 is greater than the left and right width of the lower end of the push block 17. The aperture of the through hole is smaller than the minimum width of the cross section of the guide cavity 16 to prevent the push block 17 from falling out of the through hole. When the push block 17 is pressed down, the guide surface 1 and the guide surface 2 are squeezed respectively, so that the slider 1 9 moves to the left along the T-slot 11, and the slider 2 10 moves to the right along the T-slot 11.

[0048] As shown in the figure Figures 1 - 8 As shown, a limiting flange 19 is provided at the upper end of the push rod 18 , a spring 20 is sleeved on the push rod 18 , the upper end of the spring 20 acts on the limiting flange 19 , and the lower end of the spring 20 acts on the pressure block 8 .

[0049] like Figure 2 As shown, under the action of spring three 20, the push block 17 abuts against the upper surface of the guide cavity 16. At this time, when the push rod 18 is pressed down, it will drive the pressure block 8, the slider one 9 and the slider two 10 to move downward together, as shown in FIG. Figure 6 and Figure 8 As shown, when the lower surface of the pressing block 8 abuts against the upper surface of the bottom plate 1, the push rod 18 continues to move downward until the support plate 7 abuts against the bottom of the cavity 6. During this process, the pushing block 17 squeezes the slider 1 9 and the slider 2 10 so that the two move to both sides along the T-shaped groove 11 until the left side of the slider 1 9 abuts against the right side of the cavity 6 and the right side of the slider 2 10 abuts against the right side of the cavity 6, so that the bottom abutting section a3, the side abutting section a1 and the side abutting section a2 are respectively pressed, and creases are formed at the connection between the side abutting section a1 and the bottom abutting section a3 and at the connection between the side abutting section a2 and the bottom abutting section a3.

[0050] The push block 17 is located between the two guide rods 15, and the push block 17 does not hit the guide rods 15 when moving up and down.

[0051] After the paper tape a forms a crease, it passes through the push plate from the through slot 1 4, and the push plate sticks the side abutting section 1 a1 to the bottom abutting section a3. Then the push plate abuts against the crease between the side abutting section 2 a2 and the bottom abutting section a3, and extends out from the through slot 2 5. At this time, under the action of the push plate and the right baffle plate 3, the side abutting section 2 a2 is abutted against the upper side of the side abutting section 1 a1.

[0052] like Figure 1 and 3 As shown in FIG. 8 , the left baffle plate 2 is provided with a transversely extending V-shaped groove 1 23, and the right baffle plate 3 is provided with a V-shaped groove 24 corresponding to the V-shaped groove 1 23. Figure 1 andFigure 2 As shown, a V-shaped conveying groove 25 extending in the left-right direction is provided at the front side of the first V-shaped groove 23 and the second V-shaped groove 24. A paper pushing plate 26 is provided above the V-shaped conveying groove 25. The rear end of the paper pushing plate 26 has a V-shaped portion that cooperates with the first V-shaped groove 23 / the second V-shaped groove 24. The paper tape a is conveyed by the V-shaped conveying groove 25. The paper pushing plate 26 pushes the paper tape a along the middle of the height of the paper tape a, so that the middle part of the paper tape a enters into the first V-shaped groove 23 and the second V-shaped groove 24, is folded into a V shape across the left baffle 2 and the right baffle 3 at the waist, and then is pressed into by the pressing block 8.

[0053] As Figure 1 and Figure 2 shown, a support block 27 that can move back and forth is provided at the rear side of the first V-shaped groove 23 and the second V-shaped groove 24. A third V-shaped groove 28 that cooperates with the V-shaped portion is provided on the support block 27. When the support block 27 moves forward to the maximum position, the third V-shaped groove 28 is aligned with the first V-shaped groove 23 / the second V-shaped groove 24 in the left-right direction. The support block 27 and the paper pushing plate 26 act synchronously. When the paper pushing plate 26 moves backward, the support block 27 moves forward. When the paper pushing plate 26 moves forward, the support block 27 moves backward. The two act together to fold the support plate.

[0054] Among them, the elastic force of the third spring 20 is greater than the elastic force of the fourth spring 21, ensuring that the fourth spring 21 deforms first when pressing down.

[0055] The working process of this inner bag folding mechanism is as follows:

[0056] First state: As Figures 1 - 3 shown, the pressing block 8 is located at the highest position, the paper pushing plate 26 is located at the front left side, and the support block 27 is located at the rearmost side, providing space for the entry of the paper tape a.

[0057] Second state: As Figure 4 shown, the paper pushing plate 26 and the support block 27 move relative to each other, pressing the paper tape a into the third V-shaped groove 28 of the support block 27, so that the paper tape a is folded at the waist in the front-rear direction.

[0058] Third state: As Figure 5 and Figure 6 shown, the pressing block 8 presses down onto the support plate 7.

[0059] Fourth state: As Figure 7 and Figure 8 shown, on the basis of the third state, the pressing block 8 presses down the support plate 7, so that the upper surface of the support plate 7 is lower than the upper surface of the bottom plate 1.

[0060] Subsequently, the push plate inserted through the first through groove 4 presses the first side abutting section a1 against the bottom abutting section a3. Subsequently, the push plate abuts against the crease between the second side abutting section a2 and the bottom abutting section a3 and extends out through the second through groove 5. At this time, under the action of the push plate and the right baffle 3, the second side abutting section a2 abuts against the upper side of the first side abutting section a1. The specific process of the paper tape a becoming the first side abutting section a1, the second side abutting section a2, and the bottom abutting section a3 is as shown in Figure 9 shown, which is formed by squeezing with the pressing block 8, the first slider 9, and the second slider 10 in the cavity 6.

[0061] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An inner bag folding mechanism of an automatic powder packaging machine, comprising a bottom plate (1), a left baffle (2) and a right baffle (3) vertically arranged on the bottom plate (1), the left baffle (2) and the right baffle (3) being parallel and oppositely arranged, the lower part of the left baffle (2) being provided with a through groove (4) whose lower side surface is flush with the upper surface of the bottom plate (1), the lower part of the right baffle (3) being provided with a through groove (5) whose lower side surface is flush with the upper surface of the bottom plate (1), characterized in that: The bottom plate (1) is provided with a concave cavity (6), the left side surface of the concave cavity (6) is flush with the right side surface of the left baffle (2), and the right side surface of the concave cavity (6) is flush with the left side surface of the right baffle (3). A support plate (7) is slidably fitted in the concave cavity (6), and a buffer component is provided below the support plate (7). Under the action of the buffer component, the upper surface of the support plate (7) is flush with the upper surface of the bottom plate (1), and the left baffle (2) and the right baffle (3) are slidably fitted in the concave cavity (6). A pressure block (8) which can be lifted up and down is provided between the left baffle plate (2) and the right baffle plate (3); the left and right widths of the pressure block (8) are smaller than the distance between the left baffle plate (2) and the right baffle plate (3); and the pressure block (8) is provided with a slider 1 (9) for abutting against the left side of the concave cavity (6) when the pressure block (8) presses the support plate (7) into the concave cavity (6), a slider 2 (10) for abutting against the right side of the concave cavity (6), and a driving structure for driving the slider 1 (9) and the slider 2 (10) to move.

2. The inner bag folding mechanism of the automatic powder packaging machine according to claim 1, characterized in that: The lower surface of the pressing block (8) is provided with a T-shaped groove (11) extending in the left-right direction, and the slider 1 (9) and the slider 2 (10) are slidably fitted in the T-shaped groove (11). A clearance cavity (12) connected to the T-shaped groove (11) is provided above the T-shaped groove (11), and the upper ends of the slider 1 (9) and the slider 2 (10) extend into the clearance cavity (12) respectively. A spring 1 (13) capable of driving the slider 1 (9) to move rightward is provided between the slider 1 (9) and the right side of the clearance cavity (12), and a spring 2 (14) capable of driving the slider 2 (10) to move leftward is provided between the slider 2 (10) and the left side of the clearance cavity (12).

3. The inner bag folding mechanism of the automatic powder packaging machine according to claim 2, characterized in that: The give-way cavity (12) has a guide rod (15) extending in the left-right direction. The guide rods (15) are two and are respectively arranged close to the front and rear sides of the give-way cavity (12). The slider 1 (9) and the slider 2 (10) are slidably sleeved on the guide rod (15). The same guide rod (15) is sleeved with the above-mentioned spring 1 (13) and spring 2 (14).

4. The inner bag folding mechanism of the automatic powder packaging machine according to claim 2 or 3, characterized in that: The top of the give-way cavity (12) is provided with a guide cavity (16) connected to the give-way cavity (12), the upper part of the guide cavity (16) is provided with a through hole that penetrates the pressure block (8) upward, the driving structure includes a push block (17) that is slidably fitted in the guide cavity (16) and a push rod (18) that is slidably fitted in the through hole, the lower end of the push rod (18) is fixedly connected to the push block (17), the right side of the slider one (9) is provided with a guide surface one, the left side of the slider two (10) is provided with a guide surface two, and the maximum distance between the guide surface one and the guide surface two is greater than the left and right width of the lower end of the push block (17).

5. The inner bag folding mechanism of the automatic powder packaging machine according to claim 4, characterized in that: The upper end of the push rod (18) is provided with a limiting flange (19), and the push rod (18) is sleeved with a spring three (20) whose upper end acts on the limiting flange (19), and the lower end of the spring three (20) acts on the pressing block (8).

6. The inner bag folding mechanism of the automatic powder packaging machine according to claim 1, characterized in that: The buffer assembly comprises a plurality of springs four (21) arranged at the bottom of the cavity (6), and the upper ends of the springs four (21) act on the support plate (7).

7. The inner bag folding mechanism of the automatic powder packaging machine according to claim 6, characterized in that: The bottom of the concave cavity (6) is provided with a plurality of mounting holes (22) arranged one-to-one with the spring four (21), the spring four (21) is arranged in the mounting hole (22) corresponding thereto, and the free length of the spring four (21) is greater than the depth of the mounting hole (22).

8. The inner bag folding mechanism of the automatic powder packaging machine according to claim 1, characterized in that: The left baffle plate (2) is provided with a transversely extending V-shaped groove 1 (23), the right baffle plate (3) is provided with a V-shaped groove 2 (24) corresponding to the V-shaped groove 1 (23), the front sides of the V-shaped groove 1 (23) and the V-shaped groove 2 (24) are provided with a V-shaped conveying groove (25) extending in the left-right direction, a pushing paper board (26) is provided above the V-shaped conveying groove (25), and the rear end of the pushing paper board (26) has a V-shaped portion that cooperates with the V-shaped groove 1 (23) / the V-shaped groove 2 (24).

9. The inner bag folding mechanism of the automatic powder packaging machine according to claim 8, characterized in that: A support block (27) that can move forward and backward is provided at the rear side of the V-shaped groove 1 (23) and the V-shaped groove 2 (24); the support block (27) has a V-shaped groove 3 (28) that is arranged in cooperation with the V-shaped portion; when the support block (27) moves forward to the maximum position, the V-shaped groove 3 (28) is aligned with the V-shaped groove 1 (23) / V-shaped groove 2 (24) in the left-right direction.

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