Plastic tape cutting mechanism of automatic strapping machine
By designing a plastic belt cutting mechanism including a middle knife, a front knife and a spring in an automatic bundling machine, the wear problem caused by skewed blade is solved, the belt cutting efficiency is improved, and the knife head is avoided excessive wear, and adapted to different packaging belts need.
Patent Information
- Application Number
- CN202421120147.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-22
AI Technical Summary
The plastic tape cutting mechanism of the existing automatic strapping machine is prone to skew during the tape cutting process, which leads to excessive wear, thereby reducing the efficiency of the tape cutting.
A plastic belt cutting mechanism consisting of a middle knife and a front knife mounted vertically slide in the tool box is designed, and the cutting head is pushed by a spring to fit the cutting surface of the cutting head, and the cutting head is avoided by guiding bevel and sliding rod. Wear, adjusting bolts adjust spring thrust to accommodate different packing straps.
It improves the shear efficiency of the packaging tape, avoids excessive wear of the cutting head, and adjusts the shear force according to the thickness of the packaging tape to match different usage needs.
Smart Images
Figure CN222203147U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of cutting equipment, in particular to a plastic belt cutting mechanism of an automatic strapping machine. Background Art
[0002] The strapping machine is also called a baler or a baler. The strapping machine is a machine that uses strapping tape to strap packages and completes the strapping operation. The strapping is to prevent the items from being scattered and lost, and to facilitate transportation and storage.
[0003] The utility model patent with application number CN201420754425.7 discloses a strapping mechanism in which the middle knife of a strapping machine automatically sticks to the front knife. The middle knife consists of a knife seat and a blade. Its assembly is installed in the main machine like the middle knife. The blade is connected to the knife seat boss by a groove and moves up and down with the knife seat. When cutting the strap, the blade can automatically stick to the front knife under the joint action of the knife seat and the strapping tape, and interlace with the front knife to complete the shearing of polypropylene and polyethylene strapping tapes.
[0004] However, when the above-mentioned tape cutting mechanism cuts the tape, the blade moves up and down and left and right in the blade holder at the same time. The clearance between the blade and the blade holder is large. The blade is prone to tilt during the tape cutting process, resulting in excessive wear of the blade, which in turn leads to reduced tape cutting efficiency. Utility Model Content
[0005] The technical problem to be solved by the utility model is to provide a plastic belt cutting mechanism of an automatic strapping machine, which can prevent the cutter head from excessively wearing, so as to solve the problems in the prior art.
[0006] In order to solve the above technical problems, the technical solution of the utility model is: the plastic strap cutting mechanism of the automatic strapping machine includes a middle knife and a front knife vertically slidably installed in a knife box, the front knife is provided with a strap hole for the strap to pass through, and the front knife is provided with a shearing surface on the side close to the middle knife; the middle knife includes a knife seat, and the knife seat is provided with a mounting groove on the side close to the front knife, and a knife head is horizontally slidably installed in the mounting groove, and a spring is provided in the mounting groove for pushing the knife head to move in a direction close to the front knife; a pin is fixedly installed on the knife head, and a baffle is fixedly installed on the knife box on the side of the pin close to the front knife, and a positioning surface is provided on the side of the baffle close to the pin to prevent the knife head from contacting the front knife.
[0007] As a further improvement, a guide slope is provided on the baffle, the lower end of the guide slope is connected to the upper end of the positioning surface, and the high end of the guide slope extends toward the side close to the front knife. When the tool head is in contact with the front knife, the pin shaft is separated from the baffle, and the projection of the pin shaft in the vertical direction is located on the guide slope.
[0008] As a further improvement, a laterally extending sliding rod is fixedly installed in the installation groove, and the cutter head is slidably installed on the sliding rod.
[0009] As a further improvement, when the cutter head is located below the top wall of the belt-threading hole, the pin shaft contacts the baffle plate or the pin shaft is separated from the baffle plate.
[0010] As a further improvement, an adjustment plate is installed in the installation groove for horizontal sliding. The adjustment plate is located on the side of the cutter head away from the front cutter. The spring is supported between the cutter head and the adjustment plate. An adjustment bolt is screwed on the cutter seat, and one end of the adjustment bolt is against the side of the adjustment plate away from the cutter head.
[0011] After adopting the above technical solution, the beneficial effects of the utility model are:
[0012] (1) When the present invention shears the strapping tape, when the cutter head drives the pin shaft to move upward to disengage the baffle, the spring pushes the cutter head to move rightward so that its blade is attached to the shearing surface on the left side of the front cutter, thereby improving the shearing efficiency of the strapping tape;
[0013] (2) After the strapping tape is cut, during the downward reset of the middle knife, the pin moves along the guide slope to the left and away from the front knife, and then the pin drives the knife head to the left and separates from the front knife to avoid excessive wear of the knife head;
[0014] (3) The present application facilitates adjusting the thrust of the spring on the cutter head by rotating the adjusting bolt so as to match different strapping tapes. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0016] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model;
[0017] Figure 2 It is a cross-sectional schematic diagram of the middle knife and the front knife of the first embodiment of the utility model;
[0018] Figure 3 This is a schematic diagram of the first embodiment of the utility model when the strapping tape is cut;
[0019] Figure 4 It is a top view schematic diagram of the tool box of the first embodiment of the utility model;
[0020] Figure 5 It is a cross-sectional schematic diagram of the middle knife of the second embodiment of the utility model.
[0021] In the figure: 1- tool box; 2- middle tool; 3- front tool; 4- first slide slot; 5- second slide slot; 6- rear tool; 7- belt threading hole; 8- shearing surface; 9- tool holder; 10- mounting slot; 11- tool head; 12- slide rod; 13- spring; 14- pin shaft; 15- baffle; 16- positioning surface; 17- guide slope; 18- adjustment plate; 19- adjustment bolt; 20- tension spring screw; 21- roller; 22- blade. DETAILED DESCRIPTION
[0022] Embodiment 1:
[0023] like Figures 1 to 4 As shown, the plastic strapping machine's plastic strapping machine's cutting mechanism includes a middle knife 2 and a front knife 3 vertically slidably mounted in a knife box 1. A first vertically extending chute 4 is provided in the knife box 1, and both the middle knife 2 and the front knife 3 are slidably mounted in the first chute 4; a second vertically extending chute 5 is also provided in the knife box 1, and a rear knife 6 is slidably mounted in the second chute 5, and the rear knife 6 and the front knife 3 are respectively located on the left and right sides of the middle knife 2. Tension spring screws 20 are fixedly mounted on the front and rear sides of the front knife 3, the middle knife 2 and the rear knife 6, and an avoidance groove is provided on the knife box 1 at a position corresponding to the position of the tension spring screw 20, and rollers 21 are respectively mounted on the lower ends of the front knife 3, the middle knife 2 and the rear knife 6, and the tension spring acts on the tension spring screw 20 to make the roller 21 fit downward on the cam, and the front knife 3, the middle knife 2 and the rear knife 6 are driven to move up and down by the rotation of the cam.
[0024] The upper end of the front blade 3 is provided with a threading hole 7 for the cable tie to pass through, and the side of the front blade 3 close to the middle blade 2 is provided with a shearing surface 8.
[0025] The middle knife 2 includes a knife seat 9, the upper end of which is not in contact with the front knife 3. A mounting groove 10 is provided on the upper end of the knife seat 9 near the front knife 3. A knife head 11 is mounted in a lateral sliding manner in the mounting groove 10. A blade portion 22 matching the shearing surface 8 is provided on the upper end of the knife head 11 near the front knife 3. In order to improve the stability of the installation of the knife head 11, a slide bar 12 extending transversely along the arrangement direction of the front knife 3, the middle knife 2 and the rear knife 6 is fixedly mounted in the mounting groove 10. Two slide bars 12 are arranged side by side in an upper and lower manner. One end of the slide bar 12 is embedded in the inner wall of the mounting groove 10. The knife head 11 is slidably mounted on the two slide bars 12. A spring 13 is sleeved on the slide bar 12 for pushing the knife head 11 to move in a direction close to the front knife. A pin shaft 14 is embedded on the cutter head 11, and the pin shaft 14 passes through the cutter head 11 front and back. A baffle 15 is fixedly installed on the top of the tool box 1 on the side of the pin shaft 14 close to the front knife 3. The baffle 15 is integrally formed on the tool box 1 or welded to the tool box. A positioning surface 16 is provided on the side of the baffle 15 close to the pin shaft 14 to prevent the cutter head 11 from contacting the front knife 3, and the positioning surface 16 extends vertically.
[0026] A guide slope 17 is provided on the left side of the top of the baffle 15, and the lower end of the guide slope 17 is connected to the upper end of the positioning surface 16 to the left, and the high end of the guide slope 17 extends to the right toward the side close to the front knife 3. When the cutter head 11 is attached to the shearing surface 8 on the left side of the front knife 3, the pin shaft 14 is separated from the baffle 15, and the projection of the pin shaft 14 in the vertical direction is located on the guide slope 17.
[0027] When the cutter head 11 is located below the top wall of the belt-passing hole 7 , the pin shaft 14 contacts the baffle plate 15 or the pin shaft 14 is separated from the baffle plate 15 .
[0028] In the initial state, if Figure 1 and Figure 2 As shown, the thrust of the spring 13 acts on the cutter head 11, causing the pin 14 to rest against the positioning surface on the left side of the baffle 15. At this time, the blade 22 on the upper right side of the cutter head 11 does not contact the shearing surface 8 on the left side of the front knife 3. When cutting the strapping tape, the cutter head 11 is driven upward relative to the front knife 3 by the cutter seat 9. When the cutter head 11 moves upward to the top wall close to the strapping hole 7, the cutter head 11 drives the pin 14 to move upward to break away from the baffle 15, and then the spring 13 pushes the cutter head 11 to move further to the right so that its blade 22 is attached to the shearing surface 8 on the left side of the front knife 3; the middle knife 2 continues to move upward, causing the blade 22 of the cutter head 11 to intersect with the strapping hole 7, as shown in FIG. Figure 3After the strapping tape is cut, the knife seat 9 drives the cutter head 11 to move downward relative to the front knife 3 and reset. When the cutter head 11 moves downward to below the top wall of the strapping hole 7, the cutter head 11 drives the pin 14 downward to abut against the guide slope 17 on the left side of the top of the baffle 15. The middle knife 2 continues to move downward, causing the pin 14 to move to the left along the guide slope 17 away from the front knife 3, and then the pin 14 drives the cutter head 11 to separate from the front knife 3 to the left to avoid excessive wear of the cutter head 11.
[0029] Embodiment 2:
[0030] like Figure 5 As shown, the difference between this embodiment and the first embodiment is that an adjustment plate 18 is also installed on the two slide bars 12 for transverse sliding movement, and the adjustment plate 18 is located on the side of the cutter head 11 away from the front cutter 3. The spring 13 is supported between the cutter head 11 and the adjustment plate 18. A screw hole that is transversely connected to the mounting groove 10 is provided on the side of the cutter seat 9 away from the front cutter 3, and an adjustment bolt 19 is screwed into the screw hole, and the bolt tail of the adjustment bolt 19 is against the side of the adjustment plate 18 away from the cutter head 11.
[0031] By rotating the adjusting bolt 19, the adjusting plate 18 can be driven to move left and right along the slide bar 12, thereby adjusting the thrust of the spring 13 on the cutter head 11, so as to match different strapping tapes. Specifically, when using a thicker strapping tape, by tightening the adjusting bolt 19 to increase the thrust of the spring 13 on the cutter head 11, the cutter head 11 and the front blade 3 are more closely fitted during shearing, thereby improving the cutting efficiency of the strapping tape; when using a thinner strapping tape, by loosening the adjusting bolt 19 to reduce the thrust of the spring 13 on the cutter head 11, the cutter head 11 and the front blade 3 are less closely fitted during shearing, thereby preventing the cutter head 11 from excessive wear.
[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. The plastic strapping machine's cutting mechanism is characterized by: It comprises a middle knife and a front knife which are vertically slidably installed in a tool box, the front knife is provided with a threading hole for a cable tie to pass through, and a shearing surface is provided on a side of the front knife close to the middle knife; the middle knife comprises a knife seat, a mounting groove is provided on a side of the knife seat close to the front knife, a knife head is horizontally slidably installed in the mounting groove, and a spring is provided in the mounting groove for pushing the knife head to move in a direction close to the front knife; a pin is fixedly installed on the knife head, a baffle is fixedly installed on the tool box at a side of the pin close to the front knife, and a positioning surface is provided on a side of the baffle close to the pin to prevent the knife head from contacting the front knife.
2. The plastic strapping cutting mechanism of the automatic strapping machine according to claim 1, characterized in that: The baffle plate is provided with a guide slope, the lower end of the guide slope is connected to the upper end of the positioning surface, and the high end of the guide slope extends toward the side close to the front knife. When the tool head is attached to the front knife, the pin shaft is separated from the baffle plate, and the projection of the pin shaft in the vertical direction is located on the guide slope.
3. The plastic strap cutting mechanism of the automatic strapping machine according to claim 1, characterized in that: A sliding rod extending transversely is fixedly installed in the installation groove, and the cutter head is slidably installed on the sliding rod.
4. The plastic strap cutting mechanism of the automatic strapping machine according to claim 1, characterized in that: When the cutter head is located below the top wall of the belt-passing hole, the pin shaft contacts the baffle plate or the pin shaft is separated from the baffle plate.
5. The plastic strap cutting mechanism of the automatic strapping machine according to claim 1, characterized in that: An adjustment plate is also installed in the installation groove for horizontal sliding. The adjustment plate is located on the side of the cutter head away from the front cutter. The spring is supported between the cutter head and the adjustment plate. An adjustment bolt is screwed on the cutter seat. One end of the adjustment bolt rests on the side of the adjustment plate away from the cutter head.