Quick blade replacing device of bag making machine

Abstract

The utility model relates to the technical field of blade disassembly and assembly, and discloses a bag making machine blade quick replacement device which comprises a knife rest, a knife shaft and a blade, the knife shaft is in running fit with the knife rest, and the knife shaft is locked with the knife rest through a locking unit; a plurality of positioning grooves are circumferentially formed in the peripheral surface of the cutter shaft in the axis direction of the cutter shaft; the multiple blades are matched with the positioning grooves, and the blades are fixed into the positioning grooves through the clamping units. The blade replacement device has the effect of rapidly replacing the blade.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of blade disassembly and assembly, in particular to a quick replacement device for a bag making machine blade. BACKGROUND

[0002] A bag making machine is a device used for producing various plastic packaging bags or packaging bags made of other materials. It can process packaging bags of different specifications made of plastic or other materials, among which plastic packaging bags are the main products. The bag making machine has a wide range of applications in the packaging field of food, daily necessities and industrial products.

[0003] The blade of the bag making machine is one of its key components, mainly used for cutting and sealing plastic film. The sharpness, wear resistance and cooperation precision of the blade directly affect the efficiency and quality of bag making. These blades are usually made of high-speed steel or special alloy materials to ensure their durability and cutting effect.

[0004] During the operation of the bag making machine, the replacement and maintenance of the blade are crucial. Currently, replacing the blade usually needs to be carried out after the bag making machine is stopped. The operator needs to remove the old blade first, and then fix the new blade on the blade shaft through bolts and nuts. A large number of bolts and nuts need to be disassembled and installed, and there is a defect of low efficiency in replacing the blade. CONTENT OF THE INVENTION

[0005] In order to quickly replace the blade, the application provides a quick replacement device for a bag making machine blade.

[0006] The quick replacement device for a bag making machine blade provided by the application adopts the following technical scheme:

[0007] A quick replacement device for a bag making machine blade comprises a blade holder, a blade shaft and a blade, wherein:

[0008] The blade shaft is rotationally connected with the blade holder, and the blade shaft is locked with the blade holder through a locking unit;

[0009] A plurality of positioning grooves are arranged on the outer circumferential surface of the blade shaft in the circumferential direction along the axis of the blade shaft;

[0010] A plurality of blades are arranged, the blades are matched with the positioning grooves, and the blades are fixed in the positioning grooves through a clamping unit.

[0011] Optionally, the blade holder comprises a horizontal frame and a vertical frame, wherein:

[0012] The vertical frame is arranged on the horizontal frame, and two vertical frames are arranged in parallel;

[0013] The vertical frame is provided with a placement slot, the end of the knife shaft is adapted to the placement slot, and the end of the knife shaft is provided with a mounting column, and the mounting column is rotatably matched with the placement slot.

[0014] Optionally, the end of the mounting column is provided with a plurality of adjustment slots, the plurality of adjustment slots are circumferentially distributed along the axis direction of the knife shaft, an inserting slot is provided on the inner wall of the placement slot, and the locking unit includes an insert block and a limit plate, wherein:

[0015] The plug block is plugged into and matched with the adjustment slot, and the plug block is plugged into and matched with the plug slot;

[0016] The limiting plate is detachably fixed on the vertical frame, and the limiting plate contacts the end of the knife shaft.

[0017] Optionally, the locking unit further includes a limit block, which is placed in the placement groove, and a side of the limit block close to the knife shaft is provided with an arc surface, and the arc surface is in contact with the outer peripheral surface of the mounting column.

[0018] Optionally, the clamping unit includes an electromagnet and an extrusion block, wherein:

[0019] The electromagnet is embedded in the inner wall of the positioning groove;

[0020] The extrusion block is slidably matched with the positioning groove, and magnetic material is provided inside the extrusion block.

[0021] Optionally, a guide block is provided at a position of the positioning groove close to the end of the knife shaft, and the extrusion block is in sliding engagement with the guide block.

[0022] Optionally, the cutter shaft is provided with a calibration unit, the calibration unit comprising a push block and a bolt, wherein:

[0023] The pushing block is in contact with the end of the blade;

[0024] The bolt passes through the pushing block, and the bolt is threadedly connected to the cutter shaft.

[0025] Optionally, a protective cover is provided on the tool holder.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. Multiple blades are pre-fixed on the cutter shaft. When the blade needs to be replaced, the cutter shaft is rotated inside the cutter holder to select the required blade. After the replacement is completed, the cutter shaft and the cutter holder are locked using the locking unit. If all the blades are worn, the cutter shaft and blades are removed as a whole for replacement. The installation column of the cutter shaft cooperates with the placement slot of the vertical frame. The precise positioning and stability of the cutter shaft are achieved through the plug-in cooperation of the adjustment slot and the plug-in slot, as well as the limiting effect of the limit plate and the limit block. The clamping unit clamps the blade through the cooperation of the electromagnet and the extrusion block, while the calibration unit calibrates the blade position through the cooperation of the push block and the bolt. In addition, to protect the blade, a protective cover is provided near the blade position on the vertical frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the tool holder structure in the embodiment of the present application.

[0030] Figure 3 It is a schematic diagram of the position relationship between the knife shaft and the blade in the embodiment of the present application.

[0031] Figure 4 It is a schematic diagram showing the relative positions of the insert block and the limiting plate in the embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1. Tool holder; 11. Horizontal frame; 12. Vertical frame; 121. Placement slot; 122. Insertion slot; 2. Tool shaft; 21. Mounting column; 22. Adjustment slot; 23. Positioning slot; 3. Blade; 4. Locking unit; 41. Insert block; 42. Limit plate; 43. Limit block; 5. Clamping unit; 51. Extrusion block; 52. Guide block; 6. Calibration unit; 61. Push block; 62. Bolt; 7. Protective cover. DETAILED DESCRIPTION

[0034] The following is combined with Figures 1-4 This application is described in further detail.

[0035] The embodiment of the present application discloses a quick-changing device for blades of a bag-making machine.

[0036] A quick blade replacement device for a bag-making machine includes a blade holder 1, a blade shaft 2, and a blade 3. The blade shaft 2 is mounted on the blade holder 1, rotatably engaged with the blade holder 1, and locked to the blade holder 1 via a locking unit 4. Multiple blades 3 are provided, evenly distributed circumferentially along the axis of the blade shaft 2, and are clamped by a clamping unit 5.

[0037] Several blades 3 are pre-fixed to the blade shaft 2 via a clamping unit 5. To replace a blade 3, the blade shaft 2 rotates within the blade holder 1, allowing a different blade 3 to be replaced. After the blade 3 is replaced, the blade shaft 2 and the blade holder 1 are locked together using the locking unit 4. Once all blades 3 are worn, the blade shaft 2 and blade 3 can be removed and replaced.

[0038] The tool holder 1 includes a horizontal frame 11 and a vertical frame 12. The horizontal frame 11 is arranged horizontally, and two vertical frames 12 are provided. The two vertical frames 12 are arranged vertically and parallel to each other. Each vertical frame 12 is provided with a placement groove 121, which passes through the side wall of the vertical frame 12.

[0039] Mounting posts 21 are coaxially fixedly mounted on both ends of the blade shaft 2. The mounting posts 21 are cylindrical, and their dimensions match those of the placement slot 121. When the blade shaft 2 is mounted on the tool holder 1, the mounting posts 21 of the blade shaft 2 are positioned within the placement slot 121 of the vertical frame 12 through the notch of the placement slot 121. The inner wall of the placement slot 121 is provided with an arc surface, and the outer circumferential surface of the mounting posts 21 of the blade shaft 2 mates with the arc surface of the inner wall of the placement slot 121.

[0040] A plurality of adjustment grooves 22 are provided at the end of the mounting column 21 of the knife shaft 2, which are distributed axially along the axis direction of the mounting column 21 of the knife shaft 2. In the embodiment of the present application, three adjustment grooves 22 are provided, and a plug-in groove 122 is provided at the bottom of the inner wall of the placement groove 121. The plug-in groove 122 passes through the side wall of the vertical frame 12, and the plug-in groove 122 and the adjustment groove 22 are adapted to each other.

[0041] The locking unit 4 includes an insert 41, a stopper plate 42, and a stopper block 43. The stopper plate 42 is fixedly mounted on the end of the insert 41. The insert 41 engages with the adjustment slot 22 and the insertion slot 122, respectively. To lock the blade shaft 2 and the tool holder 1, the mounting post 21 of the blade shaft 2 is rotated so that the notch of the adjustment slot 22 aligns with the notch of the insertion slot 122. The insert 41 is then inserted into the adjustment slot 22 and the insertion slot 122. The inner wall of the insertion slot 122 is restrained by the insert 41 against the wall of the adjustment slot 22, reducing the possibility of the insert 41 rotating again. Simultaneously, the stopper plate 42 is fixed to the vertical frame 12, and the stopper plate 42 restrains the mounting post 21 of the blade shaft 2, reducing the possibility of the blade shaft 2 moving horizontally.

[0042] The stopper 43 is inserted into the placement slot 121 through the notch of the placement slot 121. The end of the stopper 43, which is closest to the mounting post 21 of the blade shaft 2, is provided with an arc surface. The arc surface of the stopper 43 mates with the mounting post 21. The arc surface of the placement slot 121 wall and the arc surface of the stopper 43 intersect at the axis of the mounting post 21. When the blade shaft 2 is rotated, the stopper 43 limits the mounting post 21, reducing the possibility of the axis of the blade shaft 2 shifting.

[0043] There are multiple positioning grooves 23 on the cutter shaft 2, which are distributed circumferentially along the axial direction of the cutter shaft 2. The length direction of each positioning groove 23 is consistent with the length direction of the cutter shaft 2, and the positioning groove 23 passes through the outer peripheral surface of the cutter shaft 2 and the end of the cutter shaft 2. In the embodiment of the present application, there are three positioning grooves 23.

[0044] The clamping unit 5 includes an electromagnet and an extrusion block 51. The electromagnet is embedded in the inner wall of the positioning groove 23. The extrusion block 51 slides with the inner wall of the positioning groove 23. The extrusion block 51 is provided with magnetic material inside the extrusion block 51. The extrusion block 51 is driven to move by changing the magnetism of the electromagnet. When the blade 3 needs to be clamped, the blade 3 is placed inside the positioning groove 23. The extrusion block 51 is driven by the electromagnet to move, and the blade 3 is pressed against the groove wall of the positioning groove 23 by the extrusion block 51. A guide block 52 is provided near the end of the positioning groove 23 near the blade shaft 2. The extrusion block 51 slides with the guide block 52.

[0045] A calibration unit 6 is installed at the end of the blade shaft 2 to calibrate the blade 3. This unit comprises a push block 61 and a bolt 62. The push block 61 contacts the end of the blade 3, while the bolt 62 passes through the push block 61 and is threadedly connected to the blade shaft 2. To calibrate the position of the blade 3, tighten the bolt 62. The bolt 62's head drives the push block 61, pushing the blade 3 to complete the calibration.

[0046] In order to protect the blade 3 , a protective cover 7 is provided on the vertical frame 12 near the blade 3 .

[0047] The implementation principle of a quick blade replacement device for a bag-making machine in an embodiment of the present application is as follows: a plurality of blades 3 are pre-fixed on the cutter shaft 2. When the blade 3 needs to be replaced, the cutter shaft 2 is rotated to rotate the blade 3 inside the cutter holder 1 to select the desired blade 3. After the replacement is completed, the cutter shaft 2 and the cutter holder 1 are locked using the locking unit 4. If all the blades 3 are worn, the cutter shaft 2 and the blade 3 are removed as a whole for replacement. The mounting column 21 of the cutter shaft 2 cooperates with the placement slot 121 of the longitudinal frame 12. The precise positioning and stability of the cutter shaft 2 are achieved through the plug-in cooperation of the adjustment slot 22 and the plug-in slot 122, as well as the limiting effect of the limit plate 42 and the limit block 43. The clamping unit 5 clamps the blade 3 through the cooperation of the electromagnet and the extrusion block 51, while the calibration unit 6 calibrates the position of the blade 3 through the cooperation of the push block 61 and the bolt 62. In addition, to protect the blade 3, a protective cover 7 is provided on the longitudinal frame 12 near the position of the blade 3.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A quick blade replacement device for a bag making machine, characterized by: It comprises a tool holder (1), a tool shaft (2) and a blade (3), wherein: The knife shaft (2) is rotationally matched with the knife holder (1), and the knife shaft (2) is locked with the knife holder (1) via a locking unit (4); A plurality of positioning grooves (23) are provided on the outer peripheral surface of the knife shaft (2) along the axial direction of the knife shaft (2); A plurality of blades (3) are provided, each blade (3) is adapted to the positioning groove (23), and the blade (3) is fixed inside the positioning groove (23) via a clamping unit (5).

2. The quick blade replacement device for a bag making machine according to claim 1, characterized in that: The tool holder (1) comprises a horizontal frame (11) and a vertical frame (12), wherein: The longitudinal frame (12) is mounted on the transverse frame (11), and two longitudinal frames (12) are provided in parallel; The longitudinal frame (12) is provided with a placement groove (121), the end of the knife shaft (2) is adapted to the placement groove (121), and the end of the knife shaft (2) is provided with a mounting column (21), and the mounting column (21) is rotatably matched with the placement groove (121).

3. The quick blade replacement device for a bag making machine according to claim 2, characterized in that: The end of the mounting column (21) is provided with a plurality of adjustment slots (22), and the plurality of adjustment slots (22) are circumferentially distributed along the axial direction of the knife shaft (2). The inner wall of the placement slot (121) is provided with an insertion slot (122). The locking unit (4) includes an insertion block (41) and a limiting plate (42), wherein: The insert block (41) is plug-fitted with the adjustment slot (22), and the insert block (41) is plug-fitted with the insertion slot (122); The limiting plate (42) is detachably fixed to the longitudinal frame (12), and the limiting plate (42) contacts the end of the knife shaft (2).

4. The quick blade replacement device for a bag making machine according to claim 3, characterized in that: The locking unit (4) further comprises a limit block (43), the limit block (43) being placed in the placement groove (121), and a circular arc surface being provided on a side of the limit block (43) close to the knife shaft (2), the circular arc surface being in contact with the outer peripheral surface of the mounting column (21).

5. The quick blade replacement device for a bag making machine according to claim 1, characterized in that: The clamping unit (5) comprises an electromagnet and an extrusion block (51), wherein: The electromagnet is embedded in the inner wall of the positioning groove (23); The extrusion block (51) is slidably matched with the positioning groove (23), and magnetic material is provided inside the extrusion block (51).

6. The quick blade replacement device for a bag making machine according to claim 5, characterized in that: A guide block (52) is provided at a position of the positioning groove (23) close to the end of the knife shaft (2), and the extrusion block (51) is slidably matched with the guide block (52).

7. The quick blade replacement device for a bag making machine according to claim 1, characterized in that: The knife shaft (2) is provided with a calibration unit (6), and the calibration unit (6) comprises a push block (61) and a bolt (62), wherein: The pushing block (61) is in contact with the end of the blade (3); The bolt (62) passes through the pushing block (61), and the bolt (62) is threadedly connected to the knife shaft (2).

8. The quick blade replacement device for a bag making machine according to claim 1, characterized in that: A protective cover (7) is provided on the tool holder (1).

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