A cardboard tube four-corner cutting device

Abstract

The present invention discloses a four-corner cutting device for cardboard tubes, which comprises a bench (1). A tensioning device (5) for stretching a rectangular cardboard tube is arranged on the bench (1). Four first cylinders (4) with corner cutting tools (3) are distributed outside the tensioning device (5), and the first cylinders (4) respectively point to the four corners of the positioned cardboard tube. Columns (6) are arranged outside the tensioning device (5). A vertical linear running mechanism (7) is arranged on the columns (6). A flexible support frame (8) is connected to the moving part of the linear running mechanism (7). A rotary cylinder (9) is connected to the flexible support frame (8). The rotating end of the rotary cylinder is connected to a clamping support (10). Second cylinders (11) that extend inwards are respectively connected to two pairs of sides of the clamping support (10). The telescopic end of each second cylinder (11) is connected to a clamping block (12). The present invention improves the production efficiency of four-corner cutting of cardboard tubes and reduces the defective rate.

Description

Technical Field

[0001] The present invention relates to the technical field of carton production equipment, and particularly to a device for cutting the four corners of a cardboard tube used in a carton production line. Background Art

[0002] Smart manufacturing such as intelligent equipment based on cyber-physical systems and smart factories of industrial robots is leading the transformation of manufacturing methods. And the manufacturing industry is the main body of the national economy, the foundation for establishing the country, the instrument for rejuvenating the country, and the basis for strengthening the country. The era of automation and intelligence has arrived, which facilitates people's lives and work in many aspects and also replaces manual labor.

[0003] During the production and manufacturing process of cartons, it is necessary to cut the four corners at one end of a rectangular cardboard tube to meet the subsequent processes. Currently, the cutting efficiency of the four corners of the cardboard tube is relatively low, and defective cardboard tubes are likely to occur. Summary of the Invention

[0004] To solve the above problems, the present invention provides a device for cutting the four corners of a cardboard tube.

[0005] The present invention adopts the following technical solutions:

[0006] A device for cutting the four corners of a cardboard tube, including a bench. It is characterized in that: a tensioning device for expanding a rectangular cardboard tube is provided on the bench, and four first cylinders with corner-cutting tools are distributed outside the tensioning device, and the first cylinders respectively point to the four corners of the positioned cardboard tube;

[0007] Columns are provided outside the tensioning device, a vertical linear motion mechanism is provided on the columns, a flexible support frame is connected to the moving part of the linear motion mechanism, a rotary cylinder is connected to the flexible support frame, a clamping support is connected to the rotating end of the rotary cylinder, and second cylinders that extend inwards are respectively connected to the two opposite sides of the clamping support, and a clamping block is connected to the extending end of each second cylinder.

[0008] Further, the tensioning device includes a gantry fixed on the bench, a stepping motor is fixedly connected to the gantry, the stepping motor is connected to a screw rod with a nut, one ends of four connecting rods are respectively hinged to the nut, the four connecting rods are evenly distributed in four orthogonal directions, and swing in a vertical plane. A tensioning block is hinged to the other end of each connecting rod, and the tensioning blocks are respectively slidably connected to guide rails fixed on the bench; the up and down movement of the nut drives the connecting rods to swing, so that the corresponding connected tensioning blocks synchronously expand and contract outward and inward in a plane.

[0009] Furthermore, the tool flexible support frame includes a first mounting plate connected to the moving part of the linear motion mechanism. A group of parallel and equal-length arm rods are hinged on the first mounting plate. Each arm rod swings in a vertical plane. The other ends of this group of arm rods are hinged to a second mounting plate, and the second mounting plate is used to mount a rotary cylinder. One end of the group of arm rods is hinged to one end of a gas spring, and the other end of the gas spring is hinged to the first mounting plate.

[0010] Furthermore, the number of the group of arm rods is three, with two on the upper side and one on the lower side; the number of gas springs is two, which are respectively hinged to the two upper-side arm rods.

[0011] Furthermore, a guide rod parallel to the cylinder rod is connected to each clamping block, and the guide rod passes through the corresponding clamping bracket to form a guiding fit.

[0012] Furthermore, centered on the tensioning device, four positioning blocks enclosing a rectangular shape are connected to the bench. Notches are provided at the vertex angles of every two adjacent positioning blocks, and each notch is used to set a first cylinder.

[0013] Furthermore, the four first cylinders share one control solenoid valve, and the two second cylinders share another control solenoid valve.

[0014] Furthermore, a photoelectric sensor for detecting the incoming material is provided on the bench, and the photoelectric sensor is located inside the positioning block.

[0015] Furthermore, cylinder speed regulators and magnetic sensors are provided on the rotary cylinder and the first and second cylinders.

[0016] The beneficial effects of the present invention:

[0017] In this solution, through the cooperation of the tensioning device and the tool for synchronous movement, the function of cutting the four corners of the cardboard tube is realized, the production efficiency is improved, the defective rate is reduced, and automatic production is achieved; by setting the flexible support frame, compared with the rigid support frame, it has a buffering effect and prolongs the service life of this device; in addition, the tensioning device is driven by a stepping motor to realize the synchronous outward expansion and inward contraction of the tensioning block in the plane, which can be applied to the production of cardboard tubes of various specifications and sizes, and reduces the production cost caused by product replacement. Description of the drawings

[0018] Figure 1 is the structural schematic diagram of the present invention;

[0019] Figure 2 is the structural schematic diagram of the tensioning device;

[0020] Figure 3 is the structural schematic diagram of the flexible support frame;

[0021] Figure 4It is a schematic diagram of the guiding structure of the clamping block.

[0022] Description of the reference numerals in the drawings: 1. Bench; 2. Positioning stop block; 3. Chamfering cutter; 4. First cylinder; 5. Tensioning device; 51. Gantry; 52. Stepper motor; 53. Nut; 54. Screw rod; 55. Connecting rod; 56. Tensioning block; 57. Guide rail; 58. Mounting seat; 59. Hinge seat; 6. Column; 7. Linear running mechanism; 8. Flexible support frame; 81. First mounting plate; 82. Arm rod; 83. Second mounting plate; 84. Gas spring; 9. Rotary cylinder; 10. Clamping bracket; 11. Second cylinder; 12. Clamping block; 13. Guide rod; 14. Photoelectric sensor; 15. Sliding sleeve. Detailed implementation manners

[0023] To make the present invention more clearly understood, the following further describes a four-corner cutting device for cardboard tubes of the present invention with reference to the drawings. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] As Figure 1 shown, a four-corner cutting device for cardboard tubes is used in a cardboard box production line, specifically in the production process steps of cutting the four corners of a rectangular cardboard tube. It includes a bench 1, which is composed of a carbon steel plate tabletop and a frame welded by rectangular tubes. Four positioning stop blocks 2 surrounding a rectangular shape are connected to the tabletop of the bench 1. The positioning stop blocks 2 are strip-shaped blocks made of carbon steel, and their lengths are less than the lengths of the corresponding rectangular sides, so that gaps are formed at the top corners of each adjacent pair of positioning stop blocks 2. The sizes of the gaps are the same. At each gap, a first cylinder 4 with a chamfering cutter 3 is provided. The chamfering cutter 3 is made of bearing steel, and its moving direction points to the center of the rectangle surrounded by the positioning stop blocks 2, and the four corners of the cardboard tube are cut by the right-angled cutting edge. A tensioning device 5 for expanding the cardboard tube is provided at the center of this rectangle. Among them, the positioning stop blocks 2 can prevent the cardboard tube from running off and play a limiting role; the distances from each first cylinder 4 to the center of the tensioning device 5 are the same, ensuring the synchronous cutting of the four corners of the cardboard tube.

[0025] A column 6 is provided at the outer left position of the positioning stop block 2, and the column 6 is fixed to the ground. A vertical linear motion mechanism 7 is connected to the column 6. A cantilever flexible support frame 8 is connected to the moving part of the linear motion mechanism 7. The front end of the flexible support frame 8 is connected to a rotary cylinder 9, and the rotary end of the rotary cylinder 9 is fixedly connected to a clamping support 10. The clamping support 10 is in an "n" shape. On the two pairs of sides at its front end, second cylinders 11 that telescopically move inward are respectively connected. The second cylinders 11 are front flange cylinders, and their front flanges are fixed to the outside of the clamping support 10. The cylinder rods pass through the clamping support 10 and are connected to the clamping blocks 12 on the inner side. The two second cylinders are arranged collinearly. Among them, the linear motion mechanism 7 is a prior art, and it can be a lead screw linear motion mechanism driven by a motor, and its moving part is a slider; it can also be a linear cylinder mechanism with a guide, and its moving part is a slider connected to the end of the cylinder rod. The clamping support 10 is welded by carbon steel plates, which has high strength and stiffness, and can reduce the shaking phenomenon during the movement of the second cylinders 11.

[0026] As Figure 2 shown, the tensioning device 5 includes a gantry 51 fixed to the bench 1. The top of the gantry 51 is fixedly connected to a stepping motor 52. The stepping motor 52 is connected to a screw rod 54. The screw rod 54 is vertically arranged. A lead nut 53 is connected in cooperation with the rod body of the screw rod 54. The lead nut 53 is a ball lead nut, which can reduce the frictional resistance of the transmission. An installation seat 58 is fixedly connected to the lead nut 53. Four hinge seats 59 are fixedly connected to the lower end of the installation seat 58. The hinge seats 59 are evenly distributed in four orthogonal directions with the axis of the lead nut 53, and their openings all face down. One end of a connecting rod 55 is respectively hinged to each hinge seat 59 through a pivot. The other end of the connecting rod 55 is hinged to the corresponding tensioning block 56. The connecting rod 55 can only swing in the vertical plane of the corresponding direction, and the hinge point spacing of each connecting rod 55 is the same. The tensioning blocks 56 are respectively slidably connected to the corresponding guide rails 57. The guide rails 57 are fixed to the bench 1, and the number of them is four. The axis of each guide rail 57 is perpendicular to the length direction of the positioning stop block 2. The guide rails 57 adopt linear guide rails, and the corresponding sliders of the linear guide rails are integrated in the tensioning blocks 56. Through the guiding action of the guide rails 57, the tensioning blocks 56 can only perform linear reciprocating motion on the horizontal plane. In the tensioning device 5, the stepping motor 52 drives the screw rod 54 to rotate. Since the lead nut 53 is restricted by the connecting rod 55 and cannot rotate, it can only move up and down. When the lead nut 53 moves up and down, it acts on the connecting rod 55 to drive the corresponding tensioning blocks 56 to synchronously expand and contract in the horizontal plane. That is, when the lead nut 53 moves up, the four tensioning blocks 56 synchronously contract, and vice versa, the four tensioning blocks 56 synchronously expand.

[0027] As Figure 3As shown in the figure, the flexible support frame 8 includes a first mounting plate 81 connected to the moving part of the linear motion mechanism 7. One end of a group of arm rods 82 is hinged to the first mounting plate 81 by means of a hinge seat and a pivot. The other end of the arm rod 82 is hinged to the second mounting plate 83 in the same manner as above. The number of arm rods 82 is 3, which are parallel and of equal length to each other. Two of them are on the upper side and the other is on the lower side, and the corresponding hinge points are distributed at the vertices of an inverted isosceles triangle. Since the openings of the hinge seats are all in the vertical direction, each arm rod 82 can only drive the second mounting plate 83 to swing in the vertical plane. The second mounting plate 83 is a trapezoidal frame structure, and a rotary cylinder 9 is installed on the outer end face of the second mounting plate 83. One ends of the two upper arm rods 82 are respectively hinged to one end of the gas springs 84, and the other ends of the gas springs 84 are hinged to the lower part of the first mounting plate 81. The two gas springs 84 are parallel and of equal length to each other, and can buffer the swing of the corresponding arm rods 82 synchronously.

[0028] As Figure 4 shown in the figure, each clamping block 12 can be fixedly connected to the two guide rods 13 by means of welding, screwing and interference fit, etc. The two guide rods 13 are symmetrically distributed left and right with respect to the cylinder rod and are parallel to each other. The exposed ends of the guide rods 13 pass through the corresponding clamping brackets 10, and sliding sleeves 15 are arranged in the clamping brackets 10 to form a guiding fit with the rod bodies of the guide rods 13. During the extension action of the second cylinder 11, the clamping stability of the clamping block 12 is improved.

[0029] As Figure 2 shown in the figure, for the detection of the incoming material, a photoelectric sensor 14 is provided inside the positioning block 2, and the photoelectric sensor 14 is installed on the bench 1.

[0030] In addition, the four first cylinders 4 share a control solenoid valve, and the two second cylinders 11 share another control solenoid valve to realize the synchronous operation of the cylinders in the same group and ensure the consistency of related actions. Cylinder speed control valves and magnetic sensors are provided on the rotary cylinder 9 and the first and second cylinders, realizing the speed control function and the action detection function of the corresponding cylinders.

[0031] The usage process of this solution: In the carton production line, the cardboard tube is sleeved on the tensioning device 5 (this step is realized by the relevant mechanisms in the production line). The photoelectric sensor 14 detects the incoming material and makes the tensioning device 5 operate. In the tensioning device 5, through the action of the stepping motor 52 via the tensioning block 56, the cardboard tube is internally supported and fixed; then, the first cylinder 4 drives the corner cutting tool 3 to synchronously cut the four corners of the cardboard tube. When the cardboard tube cutting is completed, the tensioning block 56 retracts, the fixation of the cardboard tube is released, the linear motion mechanism 7 drives the flexible support frame 8 to move the clamping block 12 downward, synchronously clamp the cardboard tube, and then move upward to a position away from the tensioning device 5. The rotary cylinder 9 rotates 180°, and is transported to the subsequent production line station through the relevant mechanisms in the production line.

[0032] In this solution, the tensioning device realizes the synchronous outward and inward movement of the tensioning block in the plane through the cooperation of the nut and screw rod with the guide rail, and can be applied to the production of cardboard cylinders of various specifications and sizes, reducing the production cost and time cost caused by product replacement; the flexible support frame, through the cooperation of the articulated arm rods at both ends and the gas spring, reduces the inertial impact during the operation of the device and plays a buffering role. Especially in a working environment with a relatively fast production rhythm such as rapid start and stop in the vertical direction, the durability and service life of the device can be improved.

[0033] Generally speaking, the present invention improves the production efficiency of the four-corner cutting of cardboard cylinders and reduces the defective rate.

[0034] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention; any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A cardboard tube four-corner cutting device, comprising a bench (1), characterized in that: A tensioning device (5) for stretching a rectangular cardboard tube is provided on the bench (1). Four first cylinders (4) with chamfering cutters (3) are distributed outside the tensioning device (5), and the first cylinders (4) respectively point to the four corners of the positioned cardboard tube. A column (6) is provided outside the tensioning device (5). A vertical linear motion mechanism (7) is provided on the column (6). A flexible support frame (8) is connected to the moving part of the linear motion mechanism (7). A rotary cylinder (9) is connected to the flexible support frame (8). The rotating end of the rotary cylinder is connected to a clamping bracket (10). Two pairs of second cylinders (11) that retract and extend inward are respectively connected to the two opposite sides of the clamping bracket (10). The telescopic end of each second cylinder (11) is connected to a clamping block (12). The tensioning device (5) includes a gantry (51) fixed to the bench (1). A stepping motor (52) is fixedly connected to the gantry (51). The stepping motor (52) is connected to a screw rod (54) with a nut (53). One end of each of the four connecting rods (55) is hinged to the nut (53). The four connecting rods (55) are evenly distributed in four orthogonal directions and swing in a vertical plane. A tensioning block (56) is hinged to the other end of each connecting rod. The tensioning blocks (56) are respectively slidably connected to guide rails (57), and the guide rails (57) are fixed to the bench (1). The up and down movement of the nut (53) drives the connecting rods (55) to swing, so that the corresponding connected tensioning blocks (56) expand and contract synchronously in the plane. The flexible support frame (8) includes a first mounting plate (81) connected to the moving part of the linear motion mechanism (7). A group of parallel and equal-length arm rods (82) are hinged to the first mounting plate (81). Each arm rod (82) swings in a vertical plane. The other ends of the group of arm rods (82) are hinged to a second mounting plate (83), and the second mounting plate (83) is used to mount the rotary cylinder (9). One end of the group of arm rods (82) is hinged to a gas spring (84), and the other end of the gas spring (84) is hinged to the first mounting plate (81). Cylinder speed control valves and magnetic sensors are provided on the rotary cylinder (9), the first cylinder, and the second cylinder.

2. The four-corner cutting device for cardboard tubes according to claim 1, characterized in that: The number of the group of arm rods (82) is three, with two on the upper side and one on the lower side. The number of the gas springs (84) is two, which are respectively hinged to the two upper-side arm rods (82).

3. A cardboard tube four-corner cutting device according to claim 1 or 2, characterized in that: A guide rod (13) parallel to the cylinder rod is connected to each clamping block (12), and the guide rod (13) passes through the corresponding side of the clamping bracket (10) and forms a guiding fit.

4. A cardboard tube four-corner cutting device according to claim 1, characterized in that: Four positioning blocks (2) that enclose a rectangle are connected to the bench (1) with the tensioning device (5) as the center. Notches are provided at the top corners of each adjacent pair of positioning blocks (2), and each notch is used to arrange the first cylinder (4).

5. A four-corner cutting device for cardboard tubes according to claim 1, characterized in that: The four first cylinders (4) share one control solenoid valve, and the two second cylinders (11) share another control solenoid valve.

6. A cardboard tube four-corner cutting device according to claim 4, characterized in that: An optoelectronic sensor (14) for detecting the incoming material is provided on the bench (1), and the optoelectronic sensor (14) is located inside the positioning block (2).

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