Fully automatic manufacturing method for plastic handles of metal containers

Abstract

A fully automatic method for producing plastic handles for metal containers comprises the following steps: a) when a plastic strip is conveyed to a first station, two parallel welding rivet holes are automatically punched out at the first node position of the plastic strip; b) when conveyed to a second station, two welding rivets are automatically installed in the two welding rivet holes respectively; c) when conveyed to a third station, the first node position of the plastic strip is cut by a first arc-shaped punch at a position between the two welding rivet holes; d) when conveyed to a fourth station, the cut portion of the plastic strip at the first node position is punched and shaped by a second arc-shaped punch mirroring the first punch, so that excess material is removed and a convex arc-shaped handle end portion is formed; and steps a) and d) are repeated to separate individual plastic handles from the plastic strip. In the above method, the convex arc-shaped handle end portion is achieved by combining steps c) and d), thereby avoiding the problem of the cutting position easily deviating from the cutter due to the triangular notch punched in the process of punching the welding rivet holes.

Description

Technical Field

[0001] The invention relates to a method for manufacturing a handle of a metal container, in particular to a method for fully automatically manufacturing a plastic handle of a metal container. Background Art

[0002] In order to improve the problems of high cost and poor carrying comfort of traditional round bar metal handles, the applicant previously proposed a method and equipment for fully automatic high-speed production of plastic handles on metal packaging cans, application number 201410180247.6. The production method is as follows: a flat cross-section plastic strip is fed into an automatic production equipment for conveying. During the process of the automatic production equipment conveying each metal packaging can body, the automatic production equipment makes the plastic strip into plastic handles and installs them on the metal packaging can body accordingly. The plastic handle production and installation process consists of The following steps are carried out in sequence: ① When the plastic belt is conveyed to the first station of the automatic production equipment, two parallel welding nail holes are automatically punched out at the first node position of the plastic belt, and triangular notches are automatically punched out at the upper and lower parts of the middle position of the two welding nail holes at the same time; ② When the first node position of the plastic belt is conveyed to the second station of the automatic production equipment, two annular welding nails with pointed cone feet on the back are automatically installed on the two welding nail holes at the first node position of the plastic belt, and the welding nails are installed by inserting the pointed cone feet of the welding nails into the welding nail holes, and then the pointed cone feet of the welding nails are slightly bent outwards; ③ When the first node position of the material strip is transported to the third station of the automatic production equipment, the first node position of the plastic strip is cut off at the middle position of the two welding nail holes, and the previous node position of the first node position of the plastic strip has been processed in the same way. At this time, the first plastic handle is separated from the plastic strip; ④ Then the middle position of the first plastic handle is automatically clamped and fixed, and at the same time, the two side parts of the clamped position of the first plastic handle are automatically pushed and bent, so that the first plastic handle becomes a semicircular ring, and the sharp cone feet of the welding nails on it are exposed on the inner side of the first plastic handle; ⑤ At this time, the automatic production equipment The equipment just transports the first metal packaging can body to the first plastic handle matching position of its third station, and then the automatic welding head on the equipment automatically pushes the welding nail on the first plastic handle from the outside of the first plastic handle, so that the pointed cone foot of the welding nail contacts the first metal packaging can body and welds it firmly to the first metal packaging can body, so that the plastic handle of the first metal packaging can is completed; ⑥ When the first metal packaging can body with the plastic handle is transported away, the second metal packaging can body is transported to the second plastic handle matching position of the third station for welding, and the production cycle continues.

[0003] In the above-mentioned production method, Figure 1As shown, when the plastic strip 100 punches two welding holes 101 at the first station, triangular notches 102 are punched out at the upper and lower parts of the middle position of the two welding holes 101. The purpose of punching the two triangular notches 102 is to expect that after the cutting operation at the third station, the end shape of the formed plastic handle will be a convex arc, as shown in FIG. Figure 2 The above manufacturing method has the following drawbacks: the width of the notch 102 of the plastic strip becomes smaller, the strength becomes worse, and when the plastic strip is transported from the first station to the second station and the third station, the external force driving the plastic strip to be transported easily causes the notch 102 to deform, resulting in the cutting position easily deviating from the cutter when transported to the third station, resulting in the end shape of the plastic handle formed by cutting being non-convex arc, as shown in FIG. Figure 3 or Figure 4 shown. Summary of the Invention

[0004] The object of the present invention is to provide a fully automatic method for producing a plastic handle for a metal container, so as to solve the problem that the cutting position in the existing fully automatic method for producing a plastic handle for a metal container easily deviates from the cutter.

[0005] The present invention provides a fully automatic method for producing plastic handles for metal containers, comprising: feeding a flat-cross-section plastic strip into an automatic production device for conveying; while the automatic production device conveys each metal container, the automatic production device produces plastic handles from the plastic strip and mounts the handles on the metal containers accordingly; wherein the process of producing the plastic handles from the plastic strip by the automatic production device comprises the following steps, performed in sequence:

[0006] a) When the plastic strip is conveyed to the first station of the automatic production equipment, two parallel welding nail holes are automatically punched out at the first node position of the plastic strip;

[0007] b) When the first node position of the plastic strip is transported to the second station of the automatic production equipment, two welding nails are automatically installed on the two welding nail holes at the first node position of the plastic strip;

[0008] c) when the first node position of the plastic strip is transported to the third station of the automatic production equipment, the first node position of the plastic strip is cut by the first arc-shaped punch at a position between the two welding nail holes; and

[0009] d) When the first node position of the plastic strip is conveyed to the fourth station of the automatic production equipment, the cut portion of the plastic strip at the first node position is punched and shaped by a second arc-shaped punch that is arranged in a mirror image with the first arc-shaped punch, so that excess material is removed and a convex arc-shaped handle end is formed;

[0010] Repeat steps a) to d) above to separate plastic handles from the plastic tape.

[0011] In the above method, the convex arc-shaped handle end of the plastic handle is achieved by combining step c) and step d), and there is no need to punch a triangular notch between two welding nail holes in the process of punching welding nail holes, thereby avoiding the problem of the cutting position easily deviating from the cutter due to punching the triangular notch in the process of punching welding nail holes.

[0012] Optionally, by arranging the fourth station and the third station at two positions of the automatic production equipment, two drivers are used to respectively drive the first arc-shaped punch and the second arc-shaped punch to move to achieve cutting and punching shaping.

[0013] Optionally, by arranging the fourth station and the third station at the same position of the automatic production equipment, the first arc-shaped punch and the second arc-shaped punch are driven by the same driver to move synchronously to achieve cutting and punching shaping.

[0014] Optionally, the plastic strip is conveyed by the traction of a driving roller group arranged between the second station and the third station and close to the third station.

[0015] Optionally, the process of installing the plastic handle on the metal container includes the following steps: when the plastic handle is conveyed to the fifth station of the automatic production equipment, it is flipped 90 degrees, the middle position of the plastic handle is automatically clamped and fixed, and the two side parts of the clamped position of the plastic handle are automatically pushed to produce a pre-bend, and the pre-bent plastic handle is automatically pushed into the positioning molding mold, and is bent and positioned for the second time in the positioning molding mold so that the welding pins on the plastic handle are aligned with the metal container; the welding electrodes of the automatic production equipment press the welding pins on the plastic handle to the metal container and weld it fixed; wherein, the positioning molding mold is configured to be composed of a first mold and a second mold that are independent of each other and in a mirror-image relationship and connected by a spacing adjustment mechanism.

[0016] Optionally, the first mold and the second mold both include: a straight section whose extension direction is perpendicular to the movement direction of the welding electrode; and an inclined section extending from the end of the straight section facing the fourth workstation, in a direction approaching the fourth workstation, and away from the center line of the mold.

[0017] Optionally, the plastic handle is transported from the fourth station to the fifth station through a step-by-step circulating conveyor chain, which includes a first section extending in the direction from the fourth station to the fifth station, a second section extending in a direction perpendicular to and downward from the first section, a third section extending in the direction from the fifth station to the fourth station, and a fourth section extending in a direction perpendicular to and upward from the third section. The plastic handle is automatically flipped 90 degrees after entering the second section from the first section.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] In the above method, the convex arc-shaped handle end of the plastic handle is achieved by combining step c) and step d), and there is no need to punch a triangular notch between two welding nail holes in the process of punching welding nail holes, thereby avoiding the problem of the cutting position easily deviating from the cutter due to punching the triangular notch in the process of punching welding nail holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the plastic strip after punching out the welding nail holes and triangular notches in the existing manufacturing method;

[0021] Figure 2 The desired cutting result;

[0022] Figure 3 It is a cutting result when the cutting position deviates from the cutter;

[0023] Figure 4 Another cutting result when the cutting position deviates from the cutter;

[0024] Figure 5 Schematic diagram of the fully automatic manufacturing method of the plastic handle of the metal container of the present invention;

[0025] Figure 6 The plastic strip is in the state after the welding holes are punched out at the first working station;

[0026] Figure 7 The plastic strip is in the state after the welding holes are installed in the second station;

[0027] Figure 8 This is the state of the plastic strip after being cut at the third station;

[0028] Figure 9 The state of the plastic strip after being punched and shaped at the fourth station;

[0029] Figure 10 Schematic diagram of a plastic handle separated from a plastic belt after passing through the first to fourth stations;

[0030] Figure 11 Schematic diagram of a step-by-step circulating conveyor chain transporting plastic handles. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Unless otherwise specified, terms such as first and second in this application are used to distinguish different components with the same name and do not include meanings such as importance and sequence.

[0033] like Figure 5As shown, the fully automatic production method for plastic handles of metal containers includes: feeding a flat cross-section plastic strip 100 into an automatic production device for conveying; while the automatic production device conveys metal containers 300 one by one, the automatic production device produces plastic handles 105 from the plastic strip 100 and installs the plastic handles 105 on the metal containers 300 accordingly; wherein, the process of the automatic production device producing the plastic handles 105 from the plastic strip 100 includes the following steps performed in sequence:

[0034] a) When the plastic strip 100 is delivered to the first workstation 201 of the automatic production equipment, two parallel welding nail holes 101 are automatically punched out at the first node position of the plastic strip 100. Figure 6 The schematic diagram shows a punched welding nail hole 101 at the first node position of the plastic strip 100. The punching operation of the welding nail hole 101 is completed by a third puncher set at the first station 201.

[0035] b) When the first node position of the plastic strip 100 is transported to the second station 202 of the automatic production equipment, two welding nails 103 are automatically installed on the two welding nail holes 101 at the first node position of the plastic strip, Figure 7 The schematic diagram shows the welding nails 103 installed in the welding nail holes 101. The welding nails 103 are automatically supplied by a vibrating loader 203 provided at the second workstation 202. Alternatively, one method for feeding and installing the welding nails is as follows: the vibration of the vibrating loader 203 transports the welding nails in the hopper from two tracks to the second workstation 202, respectively. The two tracks correspond to two welding nail holes 101. When the plastic strip 100 is transported to the second workstation 202 at the first node position, the power device provided at the second workstation 202 drives the nail support rod to move, respectively, and the nail legs of the two welding nails are passed through the two parallel welding nail holes 101 punched out of the plastic strip 100. The power device provided at the second workstation 202 then drives the presser rod to bend the nail legs, thereby fixing the welding nails in the welding nail holes 101. Optionally, another method for feeding and installing welding nails is: the vibration of the vibration loader 203 transports the welding nails in the hopper from the track to the second workstation 202. When the first node position of the plastic belt 100 is transported to the second workstation 202, the robotic arm arranged on the second workstation 202 takes out the welding nail 103 from the vibration loader 203 and installs it on the two parallel welding holes 101 punched out of the plastic belt 100. The triangular notch of the welding nail 103 is then expanded and fixed on the plastic belt 100 by stamping with a tapered mold.

[0036] c) When the first node position of the plastic strip 100 is transported to the third workstation 204 of the automatic production equipment, the first node position of the plastic strip is cut by the first arc-shaped punch 206 at the middle position between the two welding nail holes 101. Figure 8 Schematically shows the state after cutting; and

[0037] d) When the first node position of the plastic strip 100 is conveyed to the fourth station 208 of the automatic production equipment, the cut portion of the plastic strip at the first node position is punched and shaped by a second arc-shaped punch 207 which is configured in a mirror image with the first arc-shaped punch 206, so that the excess material 104 is removed and a convex arc-shaped handle end is formed. Figure 9 The schematic diagram shows the state after punching and shaping;

[0038] Repeat the above steps a)-d) to separate plastic handles 105 from the plastic belt 100. Figure 10 A plastic handle 105 separated from the plastic strap 100 is schematically shown.

[0039] In the above method, the convex arc-shaped handle end of the plastic handle is achieved by combining step c) and step d), and there is no need to punch a triangular notch between two welding nail holes 101 in the process of punching the welding nail holes 101, thereby avoiding the problem that the cutting position is easily deviated from the cutter due to punching the triangular notch in the process of punching the welding nail holes 101.

[0040] Furthermore, the plastic belt 100 is conveyed by the traction force of the drive roller assembly 205 disposed between the second station 202 and the third station 204 and close to the third station 204. The traction method for conveying the plastic belt 100 can avoid the problem of the plastic belt 100 bending upward in the middle due to obstruction of the front end during the conveying process.

[0041] In the above embodiment, the fourth station 208 and the third station 204 are located at two locations in the automatic production equipment. The first arc-shaped punch 206 and the second arc-shaped punch 207 are located separately. Two actuators are used to drive the first arc-shaped punch 206 and the second arc-shaped punch 207 to achieve cutting and punching shaping. The advantage of this embodiment is that a smaller actuator can be used to drive the first arc-shaped punch 206 and the second arc-shaped punch 207.

[0042] Alternatively, the fourth station 208 and the third station 204 can be placed at the same location in the automatic production equipment, and the same driver can be used to drive the first arc-shaped punch 206 and the second arc-shaped punch 207 to move synchronously to achieve cutting and punching shaping. The advantage of this embodiment is that it can save process time.

[0043] In this embodiment, the process of installing the plastic handle 105 on the metal container 300 includes the following steps: when the plastic handle 105 is conveyed to the fifth station 209 of the automatic production equipment, it is flipped 90 degrees, the middle position of the plastic handle 105 is automatically clamped and fixed, and the two side parts of the clamped position of the plastic handle 105 are automatically pushed to produce a pre-bend, and the pre-bent plastic handle 105 is automatically pushed into the positioning molding mold, wherein the positioning molding mold is configured to be composed of a first mold 210 and a second mold 211 that are independent of each other and in a mirror relationship and connected by a spacing adjustment mechanism. In the positioning molding mold, the pre-bent plastic handle 105 is bent and positioned for the second time, and the welding nails on the plastic handle 105 are aligned with the metal container 300; the welding electrode 212 of the automatic production equipment presses the welding nails on the plastic handle 105 to the wall of the metal container 300 and welds it. In this embodiment, a combination of pre-bending and secondary bending positioning is used to align the plastic handle 105 with the metal container 300. The distance between the first mold 210 and the second mold 211 can be adjusted by a spacing adjustment mechanism, so that the handles of metal containers of different sizes can be produced without changing the mold.

[0044] Optionally, the process of installing the plastic handle 105 on the metal container body 300 may also adopt the method described in Patent No. 201410180247.6.

[0045] In this embodiment, the first mold 210 and the second mold 211 both include: an extension direction and a movement direction of the welding electrode 212 ( Figure 5 and from the end of the straight section 2101 facing the fourth station 208, toward the direction close to the fourth station 208 ( Figure 5 The mold structure of this embodiment forms an inclined section 2102 along the feeding direction of the plastic handle (i.e., the direction from top to bottom in the mold). Figure 5 In the direction from bottom to top), the handle guide part with the mouth gradually shrinks. Figure 5 Even if there is a slight deviation in the left or right direction, it can still be pushed into the positioning molding die.

[0046] In this embodiment, the plastic handle 105 is transported from the fourth station 208 to the fifth station 209 by a step-by-step circular conveyor chain. Figure 11The step-by-step, looping conveyor chain includes a first section 401 extending from the fourth station 208 to the fifth station 209, a second section 402 extending perpendicularly and downwardly from the first section 401, a third section 403 extending from the fifth station to the fourth station, and a fourth section 404 extending perpendicularly and upwardly from the third section 403. The plastic handle automatically flips 90 degrees after passing from the first section 401 to the second section 402. The plastic handle 105 is secured to the chain by a fixture and is transported from the fourth station to the fifth station by the chain.

[0047] The present invention has been described in detail above through specific embodiments. Such detailed description is intended only to help those skilled in the art understand the present invention and is not to be construed as limiting the scope of protection of the present invention. Any modifications, equivalent transformations, and the like made by those skilled in the art to the above-described solutions based on the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A fully automatic method for producing a plastic handle for a metal container, comprising: A flat cross-section plastic strip is fed into an automatic production device for conveying. During the process of the automatic production device conveying metal containers one by one, the automatic production device makes the plastic strip into plastic handles and installs them on the metal containers accordingly. The process of the automatic production device making the plastic strip into plastic handles includes the following steps performed in sequence: a) When the plastic strip is conveyed to the first station of the automatic production equipment, two parallel welding nail holes are automatically punched out at the first node position of the plastic strip, and the upper and lower parts of the middle position of the two welding nail holes are not punched out; b) When the first node position of the plastic strip is transported to the second station of the automatic production equipment, two welding nails are automatically installed on the two welding nail holes at the first node position of the plastic strip; c) when the first node position of the plastic strip is transported to the third station of the automatic production equipment, the first node position of the plastic strip is cut by the first arc-shaped punch at a position between the two welding nail holes; and d) When the first node position of the plastic strip is conveyed to the fourth station of the automatic production equipment, the cut portion of the plastic strip at the first node position is punched and shaped by a second arc-shaped punch that is arranged in a mirror image with the first arc-shaped punch, so that excess material is removed and a convex arc-shaped handle end is formed; Repeat steps a) to d) above to separate the plastic handles from the plastic strip.

2. The fully automatic manufacturing method for plastic handles of metal containers according to claim 1, characterized in that: By arranging the fourth station and the third station at two positions of the automatic manufacturing equipment, two drivers are used to respectively drive the first arc-shaped punch and the second arc-shaped punch to move to achieve cutting and punching shaping.

3. The fully automatic manufacturing method for plastic handles of metal containers according to claim 1, characterized in that: By arranging the fourth station and the third station at the same position of the automatic production equipment, the first arc-shaped punch and the second arc-shaped punch are driven by the same driver to move synchronously to achieve cutting and punching shaping.

4. The fully automatic manufacturing method for plastic handles of metal containers according to claim 1, characterized in that: The plastic strip is conveyed by the traction of a driving roller group arranged between the second station and the third station and close to the third station.

5. The fully automatic manufacturing method of the plastic handle of the metal container according to claim 1, characterized in that: The process of installing plastic handles on metal containers includes the following steps: When the plastic handle is delivered to the fifth station of the automatic production equipment, it is flipped 90 degrees. The middle part of the plastic handle is automatically clamped and fixed. The two sides of the clamped part of the plastic handle are automatically pushed to produce a pre-bend. The pre-bent plastic handle is automatically pushed into the positioning molding die, where it is bent and positioned again. Finally, the welding nails on the plastic handle are aligned with the metal container. The welding electrodes of the automatic manufacturing equipment press the welding pins on the plastic handle to the wall of the metal container and weld it in place; The positioning molding die is configured to consist of a first die and a second die that are independent of each other and in a mirror image relationship and are connected by a spacing adjustment mechanism.

6. The fully automatic manufacturing method for plastic handles of metal containers according to claim 5, characterized in that: The first mold and the second mold both include: a straight section extending in a direction perpendicular to the direction of movement of the welding electrode; and An inclined section extends from the end of the straight section facing the fourth station, in a direction approaching the fourth station and in a direction away from the center line of the mold.

7. The fully automatic manufacturing method for plastic handles of metal containers according to claim 5, characterized in that: The plastic handle is transported from the fourth station to the fifth station through a step-by-step circulating conveyor chain, which includes a first section extending in the direction from the fourth station to the fifth station, a second section extending in a direction perpendicular to and downward from the first section, a third section extending in the direction from the fifth station to the fourth station, and a fourth section extending in a direction perpendicular to and upward from the third section. The plastic handle is automatically flipped 90 degrees after entering the second section from the first section.

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