Heavy-duty in-mold labeling double drawing arms

Abstract

The present invention discloses a double drawing arm for in-mold labeling for heavy-duty use, which includes a base, a first drawing arm, a second drawing arm, a first driving unit and a second driving unit. The first driving unit and the second driving unit are installed on the base. The first drawing arm has a first center-of-gravity connecting member located on the plane where its center of gravity is located, and the first center-of-gravity connecting member is connected to the first driving unit. The second drawing arm has a second center-of-gravity connecting member located on the plane where its center of gravity is located, and the second center-of-gravity connecting member is connected to the second driving unit. A plurality of first carriers are arranged on the first drawing arm, and a plurality of second carriers are arranged on the second drawing arm. The first driving unit and the second driving unit respectively drive the first drawing arm and the second drawing arm to move in directions away from or towards each other. Since the connection position of the driving unit is at the center-of-gravity position of the drawing arm, the driving unit can reduce jitter when driving the drawing arm to move, and the load is relatively uniform, so it can be applied to heavy-duty carriers.

Description

Technical Field

[0001] The present invention relates to the field of in-mold labeling equipment, and particularly to a double drawing arm for heavy-duty in-mold labeling. Background Art

[0002] In-mold labeling is a brand-new label packaging form different from traditional direct screen printing, heat shrink labels, and self-adhesive labels. In-mold labels are mainly used for blow-molded and injection-molded products made of materials such as PP, PE, and PET. That is, the pre-printed in-mold labels are placed into the blow or injection mold cavity before blow molding or injection molding. When the mold is closed for blowing or injection, the special adhesive on the in-mold label melts under the action of high temperature and high pressure in the mold and fuses with the surface of the bottle body or injection molded part. When the mold is opened, the label has been integrally formed with the product. Since the in-mold label and the plastic part naturally blend into one body and deform with the deformation of the bottle body, there will be no phenomena such as blistering or wrinkling. At the same time, ordinary labels need to be labeled after the container is formed, while the in-mold label and the container are formed in one step, thus preventing possible contamination of the bottle body during the labeling process.

[0003] When completing the in-mold labeling process, a corresponding in-mold labeling double drawing mechanism is required to place the product to be labeled and the label strip on the front and rear molds respectively, and then move them away from the forming mold and wait for the product to be formed.

[0004] In the existing in-mold labeling double drawing mechanism, the output end of the driving unit is directly connected to the end of the drawing arm. The defect it brings is that when the two drawing arms move, they are prone to jitter, need to move slowly, and need to wait for stability before adsorbing or placing the bottle, otherwise the error will be very large. Therefore, the moving speed of this in-mold labeling double drawing mechanism is very slow, and it can only be applied to light carriers and not to heavy carriers.

[0005] Therefore, there is an urgent need for a double drawing arm for heavy-duty in-mold labeling with small jitter, capable of carrying heavy carriers and having an increased moving speed to overcome the above defects. Summary of the Invention

[0006] The purpose of the present invention is to provide a double drawing arm for heavy-duty in-mold labeling with small jitter, capable of carrying heavy carriers and having an increased moving speed.

[0007] To achieve the above object, the heavy-duty in-mold labeling double drawing arm of the present invention includes a base, a first drawing arm, a second drawing arm, a first driving unit, and a second driving unit. The first driving unit is installed on the base. The first drawing arm has a first center-of-gravity connecting member located on the plane where its center of gravity is located. The first center-of-gravity connecting member is connected to the output end of the first driving unit. The second driving unit is installed on the base. The second drawing arm has a second center-of-gravity connecting member located on the plane where its center of gravity is located. The second center-of-gravity connecting member is connected to the output end of the second driving unit. A plurality of first carriers for loading products are provided on the first drawing arm, and a plurality of second carriers for loading labels are provided on the second drawing arm. The first driving unit and the second driving unit respectively drive the first drawing arm and the second drawing arm to move in directions away from or close to each other.

[0008] Compared with the prior art, the heavy-duty in-mold labeling double drawing arm of the present invention has a first center-of-gravity connecting member on the first drawing arm and a second center-of-gravity connecting member on the second drawing arm. The output end of the first driving unit is connected to the first center-of-gravity connecting member, and the output end of the second driving unit is connected to the second center-of-gravity connecting member. Since the connection position of the first driving unit is at the center-of-gravity position of the first drawing arm, the first driving unit can reduce jitter when driving the first drawing arm to move, and the load is relatively uniform during movement. Therefore, the weight range of the first carrier can be increased, and it can be applicable to heavy-duty first carriers. Similarly, since the connection position of the second driving unit is at the center-of-gravity position of the second drawing arm, the second driving unit can reduce jitter when driving the second drawing arm to move, and the load is relatively uniform during movement. Therefore, the weight range of the second carrier can be increased. After the first drawing arm and the second drawing arm move smoothly, the moving speeds of the first drawing arm and the second drawing arm can be appropriately increased, thereby improving work efficiency.

[0009] Preferably, the output end of the first driving unit is connected to a first mounting member. The first mounting member includes a first mounting portion and a second mounting portion. The first mounting portion is installed on the output end of the first driving unit, and the second mounting portion is connected to the first center-of-gravity connecting member. The output end of the second driving unit is connected to a second mounting member. The second mounting member includes a third mounting portion and a fourth mounting portion. The third mounting portion is installed on the output end of the second driving unit, and the fourth mounting portion is connected to the second center-of-gravity connecting member.

[0010] Preferably, the first pulling arm includes at least two first mounting arms that are parallel to each other and spaced apart, the first center-of-gravity connecting member is perpendicular to the first mounting arms and connects all of the first mounting arms at the same time, and the first center-of-gravity connecting member is disposed in the middle of the first mounting arms; the second pulling arm includes at least two second mounting arms that are parallel to each other and spaced apart, the second center-of-gravity connecting member is perpendicular to the second mounting arms and connects all of the second mounting arms at the same time, and the second center-of-gravity connecting member is disposed in the middle of the second mounting arms.

[0011] Preferably, the first carrier is mounted on the first mounting arms at intervals; the second carrier is mounted on the second mounting arms at intervals.

[0012] Preferably, the base includes a mounting cavity for mounting the first driving unit and the second driving unit, and a first isolation member and a second isolation member are further disposed in the base. The first isolation member divides the mounting cavity into a first mounting cavity and a second mounting cavity adjacent to each other in the horizontal direction, and the second isolation member divides the second mounting cavity into an upper mounting cavity and a lower mounting cavity adjacent to each other in the up-and-down direction. A part of the first driving unit is located in the first mounting cavity and another part is located in the upper mounting cavity, and a part of the second driving unit is located in the first mounting cavity and another part is located in the lower mounting cavity.

[0013] Preferably, the first driving unit includes a first driver, a first synchronous commutation assembly, a first lead screw, and a first nut. The first driver is located in the first mounting cavity, a part of the first synchronous commutation assembly is located in the first mounting cavity and a part is located in the upper mounting cavity, and the first lead screw and the first nut are located in the upper mounting cavity; the first synchronous commutation assembly is connected to the first driver, the first lead screw is connected to the first synchronous commutation assembly, the first nut is sleeved on the first lead screw, the first driver drives the first synchronous commutation assembly to rotate, the rotation of the first synchronous commutation assembly drives the first lead screw to rotate, the rotation of the first lead screw drives the first nut to move, and the movement of the first nut drives the first center-of-gravity connecting member to move.

[0014] Preferably, the second driving unit includes a second driver, a second synchronous commutation assembly, a second lead screw, and a second nut. The second driver is located in the first installation cavity. The second synchronous commutation assembly is partially located in the first installation cavity and partially located in the lower installation cavity. The second lead screw and the second nut are located in the lower installation cavity. The second synchronous commutation assembly is connected to the second driver. The second lead screw is connected to the second synchronous commutation assembly. The second nut is sleeved on the second lead screw. The second driver drives the second synchronous commutation assembly to rotate. The rotation of the second synchronous commutation assembly drives the second lead screw to rotate. The rotation of the second lead screw drives the second nut to move. The movement of the second nut drives the second center of gravity connecting member to move.

[0015] Preferably, the first spacer has a hollow hole.

[0016] Preferably, a first sliding guide assembly is provided on the upper surface of the second spacer, and a second sliding guide assembly is provided on the lower surface of the second spacer. The first driving unit is connected to the first center of gravity connecting member through the first sliding guide assembly, and the second driving unit is connected to the second center of gravity connecting member through the second sliding guide assembly.

[0017] Preferably, the first sliding guide assembly includes a first slide rail and a first slider that are slidably arranged relative to each other. One of the first slide rail and the first slider is installed on the upper surface of the second spacer, and the other of the first slide rail and the first slider is connected to the first center of gravity connecting member. The second sliding guide assembly includes a second slide rail and a second slider that are slidably arranged relative to each other. One of the second slide rail and the second slider is installed on the lower surface of the second spacer, and the other of the second slide rail and the second slider is connected to the second center of gravity connecting member. Description of the Drawings

[0018] Figure 1 is a perspective view of the in-mold labeling double drawing arm for heavy use of the present invention.

[0019] Figure 2 is a perspective view of another angle of the in-mold labeling double drawing arm for heavy use of the present invention.

[0020] Figure 3 is a perspective view of the in-mold labeling double drawing arm for heavy use of the present invention with the translation mechanism hidden.

[0021] Figure 4 is Figure 3 a perspective view of another angle in

[0022] Figure 5 is a perspective view of the in-mold labeling double drawing arm for heavy use of the present invention with the base housing hidden.

[0023] Figure 6 is the heavy-duty Use Stereogram of the first drive unit and the second drive unit revealed after the base of the in-mold labeling double-drawing arm is hidden.

[0024] Figure 7 is Figure 6 Stereogram of another perspective.

[0025] Figure 8 Stereogram of the translation mechanism of the in-mold labeling double-drawing arm for heavy-duty use of the present invention. Detailed implementation manner

[0026] In order to elaborate in detail on the technical content and structural features of the present invention, the following further explanation is provided in conjunction with the implementation manners and with reference to the drawings.

[0027] Please refer to Figures 1 to 2 , the in-mold labeling double-drawing arm 100 for heavy-duty use of the present invention includes a base 1, a first drawing arm 2, a second drawing arm 3, a first drive unit 4, and a second drive unit 5. The first drive unit 4 is installed on the base 1. The first drawing arm 2 has a first center-of-gravity connecting member 21 located on the plane where its center of gravity lies, and the first center-of-gravity connecting member 21 is connected to the output end of the first drive unit 4. The second drive unit 5 is installed on the base 1. The second drawing arm 3 has a second center-of-gravity connecting member 31 located on the plane where its center of gravity lies, and the second center-of-gravity connecting member 31 is connected to the output end of the second drive unit 5. A plurality of first carriers 6 for loading products are provided on the first drawing arm 2. A plurality of second carriers 7 for loading labels are provided on the second drawing arm 3. The first carriers 6 and the second carriers 7 are aligned with each other in the height direction, and the first drive unit 4 and the second drive unit 5 respectively drive the first drawing arm 2 and the second drawing arm 3 to move in directions away from or towards each other. By virtue of the first center-of-gravity connecting member 21 provided on the first drawing arm 2 and located at its center of gravity, and the first center-of-gravity connecting member 21 being connected to the output end of the first drive unit 4, the jitter can be reduced when the first drive unit 4 drives the first drawing arm 2, thereby making the movement of the first drawing arm 2 more stable and reliable; similarly, by virtue of the second center-of-gravity connecting member 31 provided on the second drawing arm 3 and located at its center of gravity, and the second center-of-gravity connecting member 31 being connected to the output end of the second drive unit 5, the jitter can be reduced when the second drive unit 5 drives the second drawing arm 3, thereby making the movement of the second drawing arm 3 more stable and reliable. When the movement stability of the first drawing arm 2 and the second drawing arm 3 is improved, heavier first carriers 6 or second carriers 7 can be carried, and the range of applicable carriers is wider; in addition, the first drive unit 4 and the second drive unit 5 can be appropriately speeded up to increase the movement speed of the first drawing arm 2 and the second drawing arm 3. More specifically, as follows:

[0028] Please refer toFigure 3 and Figure 4 The output end of the first driving unit 4 is connected with a first mounting member 8. The first mounting member 8 includes a first mounting portion 81 and a second mounting portion 82. The first mounting portion 81 is mounted on the output end of the first driving unit 4, and the second mounting portion 82 is connected with the first gravity connecting member 21. Similarly, the output end of the second driving unit 5 is connected with a second mounting member 9. The second mounting member 9 includes a third mounting portion 91 and a fourth mounting portion 92. The third mounting portion 91 is mounted on the output end of the second driving unit 5, and the fourth mounting portion 92 is connected with the second gravity connecting member 31. For example, in this embodiment, both the first mounting member 8 and the second mounting member 9 are L-shaped structures, but it is not limited thereto.

[0029] Please refer to Figures 1 to 4 , the first pulling arm 2 includes two horizontal first mounting arms 22 spaced apart in the vertical direction. The first gravity connecting member 21 is vertically arranged and simultaneously connected to all the first mounting arms 22. The first gravity connecting member 21 is arranged in the middle of the first mounting arms 22. Of course, in other embodiments, the number of the first mounting arms 22 can be three or four, so it is not limited thereto; specifically, the first carriers 6 are uniformly spaced and mounted on the first mounting arms 22. Specifically, in this embodiment, a first carrier connecting member 23 is further connected to the first mounting arms 22. For the first carrier connecting member 23 located above, one end thereof is connected to the first mounting arm 22, and the other end thereof is connected to the first carrier 6; for the first carrier connecting member 23 located below, the middle thereof is connected to the first mounting arm 22, and the two ends thereof are connected to the first carrier 6. Therefore, in this embodiment, the first carriers 6 are arranged in three rows. Of course, in other embodiments, according to the different number of the first mounting arms 22 and the different connection positions of the first carrier connecting members 23, the number of rows of the first carriers 6 can be two rows, four rows, five rows or six rows, etc., so it is not limited thereto. Of course, in other embodiments, the first pulling arm 2 includes at least two vertically arranged first mounting arms 22 spaced apart in the horizontal direction. The first gravity connecting member 21 is horizontally arranged and simultaneously connected to all the first mounting arms 22. The first gravity connecting member 21 is arranged in the middle of the first mounting arms 22. Therefore, the arrangement directions of the first mounting arms and the first gravity connecting member are not limited thereto.

[0030] Similarly, please refer to Figures 1 to 4, the second pulling arm 3 includes two horizontal second mounting arms 32 spaced apart in the vertical direction. The second gravity center connecting member 31 is vertically arranged and connects all the second mounting arms 32 at the same time. The second gravity center connecting member 31 is provided in the middle of the second mounting arms 32. Of course, in other embodiments, the number of the second mounting arms 32 can be three or four, so this is not limited thereto. Specifically, the second carriers 7 are evenly spaced and mounted on the second mounting arms 32. Specifically, in this embodiment, a second carrier connecting member 33 is further connected to the second mounting arms 32. For the second carrier connecting member 33 located above, one end thereof is connected to the second mounting arm 32, and the other end thereof is connected to the second carrier 7. For the second carrier connecting member 33 located below, the middle thereof is connected to the second mounting arm 32, and the two ends thereof are connected to the second carrier 7. Therefore, in this embodiment, the second carriers 7 are arranged in three rows. Of course, in other embodiments, depending on the number of the second mounting arms 32 and the connection positions of the second carrier connecting members 33, the number of rows of the second carriers 7 can be two rows, four rows, five rows or six rows, etc., so this is not limited thereto. Of course, in other embodiments, the second pulling arm 3 includes at least two vertically arranged second mounting arms 32 spaced apart in the horizontal direction. The second gravity center connecting member 31 is horizontally arranged and connects all the second mounting arms 32 at the same time. The second gravity center connecting member 31 is provided in the middle of the second mounting arms 32. Therefore, the arrangement directions of the second mounting arms 32 and the second gravity center connecting member 31 are not limited thereto.

[0031] Please refer to Figures 5 to 7 , the base 1 includes an installation cavity for installing the first driving unit 4 and the second driving unit 5. A first isolating member 11 and a second isolating member 12 are further provided in the base 1. The first isolating member 11 divides the installation cavity into a first installation cavity 13 and a second installation cavity 14 adjacent to each other in the horizontal direction. The second isolating member 12 divides the second installation cavity 14 into an upper installation cavity 141 and a lower installation cavity 142 adjacent to each other in the up-and-down direction. A part of the first driving unit 4 is located in the first installation cavity 13 and another part is located in the upper installation cavity 141. A part of the second driving unit 5 is located in the first installation cavity 13 and another part is located in the lower installation cavity 142. By means of the base 1 dividing the installation cavity into the first installation cavity 13, the upper installation cavity 141 and the lower installation cavity 142, not only provides installation space for the first driving unit 4 and the second driving unit 5, but also makes the utilization of the installation space reasonable, so that the volume of the base 1 can be greatly reduced, and the structure of the base 1 is more compact. Preferably, the first isolating member 11 has a hollow hole 111, so that some parts of the first driving unit 4 can pass through the hollow hole 111 to reach the upper installation cavity 141, and some parts of the second driving unit 5 can pass through the hollow hole 111 to reach the lower installation cavity 142.

[0032] Please refer to Figure 5 and Figure 6, the first driving unit 4 includes a first driver 41, a first synchronous commutation assembly 42, a first lead screw 43 and a first nut 44. The first driver 41 is located in the first installation cavity 13, part of the first synchronous commutation assembly 42 is located in the first installation cavity 13, and part is located in the upper installation cavity 141. The first lead screw 43 and the first nut 44 are located in the upper installation cavity 141. The first synchronous commutation assembly 42 is connected to the first driver 41, the first lead screw 43 is connected to the first synchronous commutation assembly 42, the first nut 44 is sleeved on the first lead screw 43, the first driver 41 drives the first synchronous commutation assembly 42 to rotate, the rotation of the first synchronous commutation assembly 42 drives the first lead screw 43 to rotate, the rotation of the first lead screw 43 drives the first nut 44 to move, and the movement of the first nut 44 drives the first installation member 8 to move so as to drive the first center-of-gravity connecting member 21 to move. Specifically, in this embodiment, the first synchronous commutation assembly 42 includes a first driving wheel 421, a first driven wheel 422 and a first conveyor belt 423. The first driving wheel 421 is connected to the first driver 41, the first driving wheel 421 is located in the first installation cavity 13, the first driven wheel 422 is located in the upper installation cavity 141, the first driven wheel 422 and the first driving wheel 421 are arranged at different heights in the height direction, the first conveyor belt 423 is simultaneously sleeved on the first driving wheel 421 and the first driven wheel 422, and the first conveyor belt 423 passes through the hollow hole 111 of the first separator 11. The first driven wheel 422 is sleeved on the first lead screw 43. Therefore, the first driver 41 drives the first driving wheel 421 to rotate, thereby driving the first driven wheel 422 to rotate, the first driven wheel 422 drives the first lead screw 43 to rotate, and thereby drives the first nut 44 to move. Preferably, in this embodiment, first bearing seats 46 are respectively installed at both ends of the first lead screw 43. With the help of the first bearing seats 46, the rotation of the first lead screw 43 is more stable and reliable.

[0033] Please refer to Figure 6 , preferably, in order to provide guidance for the movement of the first installation member 8 and improve the stability and reliability of its movement, a first sliding guide assembly 45 is provided on the upper surface of the second separator 12. The first driving unit 4 is connected to the first center-of-gravity connecting member 21 through the first sliding guide assembly 45. Specifically, in this embodiment, the first sliding guide assembly 45 includes a first slide rail 451 and a first slider 452 that are relatively slidably arranged. There are two first slide rails 451 and they are installed on the upper surface of the second separator 12 at intervals. The first slider 452 is installed on the bottom surface of the first installation member 8. When the first installation member 8 is driven to move, the first slider 452 slides relative to the first slide rail 451. It can be understood that the number of the first slide rails 451 can be one, three or four, etc., so it is not limited thereto.

[0034] Please refer to Figure 5 and Figure 7, the second driving unit 5 includes a second driver 51, a second synchronous commutation assembly 52, a second lead screw 53, and a second nut 54. The second driver 51 is located in the first installation cavity 13. Part of the second synchronous commutation assembly 52 is located in the first installation cavity 13, and part is located in the lower installation cavity 142. The second lead screw 53 and the second nut 54 are located in the lower installation cavity 142. The second synchronous commutation assembly 52 is connected to the second driver 51. The second lead screw 53 is connected to the second synchronous commutation assembly 52. The second nut 54 is sleeved on the second lead screw 53. The second driver 51 drives the second synchronous commutation assembly 52 to rotate. The rotation of the second synchronous commutation assembly 52 drives the second lead screw 53 to rotate. The rotation of the second lead screw 53 drives the second nut 54 to move. The movement of the second nut 54 drives the second installation member 9 to move so as to drive the second center-of-gravity connecting member 31 to move. Specifically, in this embodiment, the second synchronous commutation assembly 52 includes a second driving wheel 521, a second driven wheel 522, and a second conveyor belt 523. The second driving wheel 521 is connected to the second driver 51. The second driving wheel 521 is located in the first installation cavity 13. The second driven wheel 522 is located in the lower installation cavity 142. The second conveyor belt 523 is simultaneously sleeved on the second driving wheel 521 and the second driven wheel 522. The second conveyor belt 523 passes through the hollow hole 111 of the second separator 12. The second driven wheel 522 is sleeved on the second lead screw 53. Therefore, the second driver 51 drives the second driving wheel 521 to rotate, thereby driving the second driven wheel 522 to rotate. The second driven wheel 522 drives the second lead screw 53 to rotate, thereby driving the second nut 54 to move. Preferably, in this embodiment, second bearing seats 56 are respectively installed at both ends of the second lead screw 53. With the help of the second bearing seats 56, the rotation of the second lead screw 53 is more stable and reliable.

[0035] Please refer to Figure 7 , preferably, in order to provide guidance for the movement of the second installation member 9 and improve the stability and reliability of its movement, a second sliding guide assembly 55 is provided on the lower surface of the second separator 12. The second driving unit 5 is connected to the second center-of-gravity connecting member 31 through the second sliding guide assembly 55. Specifically, in this embodiment, the second sliding guide assembly 55 includes a second slide rail 551 and a second slider 552 that are relatively slidably arranged. There are two second slide rails 551 and they are installed on the lower surface of the second separator 12 at intervals. The second slider 552 is installed on the top surface of the second installation member 9. When the second installation member 9 is driven to move, the second slider 552 slides relative to the second slide rail 551. It can be understood that the number of the second slide rails 551 can be one, three, four, etc., and thus it is not limited thereto.

[0036] By adopting the driving mode of screw-nut with the first driving unit 4 and the second driving unit 5, compared with the traditional belt transmission mode, the linear distance between the first pulling arm 2 and the second pulling arm 3 can be shortened, making it suitable for products with small strokes, such as products with a relatively short height like cups.

[0037] Please refer to Figure 8 , specifically, in this embodiment, the heavy-duty in-mold labeling double pulling arm 100 of the present invention further includes a translation mechanism 10 for driving the base 1 to move in the horizontal direction. Specifically, in this embodiment, a translation slider 106 is provided on the bottom surface of the base 1. The translation mechanism 10 includes a frame 101, a translation driver 102 installed on the frame 101, a translation driving wheel 103 connected to the translation driver 102, a translation driven wheel 104 spaced apart from the translation driving wheel 103, and a translation conveyor belt 105 sleeved on the translation driving wheel 103 and the translation driven wheel 104. Two translation slide rails 107 arranged along the translation direction of the base 1 are further provided on the upper surface of the frame 101. The base 1 is connected to the translation conveyor belt 105 through a connecting member. When the translation mechanism 10 works, the translation driver 102 drives the translation driving wheel 103 to rotate, thereby driving the translation driven wheel 104 to rotate and the translation conveyor belt 105 to perform a rotary motion. When the translation conveyor belt 105 performs a rotary motion, it drives the base 1 to move in the horizontal direction. With the translation slider 106 and the translation slide rails 107, guidance is provided for the movement of the base 1 and its stability and reliability are improved. It can be understood that the translation mechanism 10 can also be a chain drive or other drive modes, so it is not limited thereto.

[0038] Combined with the accompanying drawings, the working principle of the heavy-duty in-mold labeling double pulling arm 100 of the present invention is described as follows: Before the translation mechanism 10 drives the base 1 to move to the mold cavity, the first driving unit 4 drives the first pulling arm 2 to move towards the second pulling arm 3, and the second driving unit 5 drives the second pulling arm 3 to move towards the first pulling arm 2, so that the first pulling arm 2 and the second pulling arm 3 approach each other. Then the translation mechanism 10 drives the base 1, the first pulling arm 2 and the second pulling arm 3 to translate together to the mold cavity. When the first carrier 6 and the second carrier 7 reach the mold cavity, the first driving unit 4 and the second driving unit 5 respectively drive the first pulling arm 2 and the second pulling arm 3 to move in opposite directions, so as to respectively place the product and the label into their respective mold cavities. Then the first driving unit 4 and the second driving unit 5 drive the first pulling arm 2 and the second pulling arm 3 to move towards each other again, and the translation mechanism 10 drives the electric base 1 to move to the initial position.

[0039] Compared with the prior art, the heavy-duty in-mold labeling double drawing arms 100 of the present invention have a first center-of-gravity connecting member 21 by means of the first drawing arm 2, the second drawing arm 3 has a second center-of-gravity connecting member 31, and the output end of the first driving unit 4 is connected to the first center-of-gravity connecting member 21, and the output end of the second driving unit 5 is connected to the second center-of-gravity connecting member 31. Since the connection position of the first driving unit 4 is at the center-of-gravity position of the first drawing arm 2, when the first driving unit 4 drives the first drawing arm 2 to move, jitter can be reduced, and the load is relatively uniform during movement. Therefore, the weight range of the first carrier 6 can be increased, and it can be applicable to the heavy-duty first carrier 6. Similarly, since the connection position of the second driving unit 5 is at the center-of-gravity position of the second drawing arm 3, when the second driving unit 5 drives the second drawing arm 3 to move, jitter can be reduced, and the load is relatively uniform during movement. Therefore, the weight range of the second carrier 7 can be increased. Since the movements of the first drawing arm 2 and the second drawing arm 3 are relatively stable, the moving speeds of the first drawing arm 2 and the second drawing arm 3 can be appropriately increased, thereby improving work efficiency.

[0040] The above-disclosed are only the preferred examples of the present invention, and the scope of the rights of the present invention cannot be limited thereby. Therefore, all equivalent changes made according to the claims of the present invention fall within the scope covered by the present invention.

Claims

1. A heavy-duty in-mold labeling double drawing arm, characterized in that, It includes a base, a first pulling arm, a second pulling arm, a first driving unit and a second driving unit. The first driving unit is installed on the base. The first pulling arm has a first center-of-gravity connecting member located at its center of gravity, and the first center-of-gravity connecting member is connected to the output end of the first driving unit. The second driving unit is installed on the base. The second pulling arm has a second center-of-gravity connecting member located at its center of gravity, and the second center-of-gravity connecting member is connected to the output end of the second driving unit. A plurality of first carriers for loading products are provided on the first pulling arm, and a plurality of second carriers for loading labels are provided on the second pulling arm. The first driving unit and the second driving unit respectively drive the first pulling arm and the second pulling arm to move in directions away from or close to each other; Wherein, the first pulling arm includes at least two first mounting arms that are parallel to each other and spaced apart. The first center-of-gravity connecting member is perpendicular to the first mounting arms and simultaneously connects all the first mounting arms. The first center-of-gravity connecting member is disposed in the middle of the first mounting arms; the second pulling arm includes at least two second mounting arms that are parallel to each other and spaced apart. The second center-of-gravity connecting member is perpendicular to the second mounting arms and simultaneously connects all the second mounting arms. The second center-of-gravity connecting member is disposed in the middle of the second mounting arms; The base includes an installation cavity for installing the first driving unit and the second driving unit. A first isolation member and a second isolation member are further provided in the base. The first isolation member divides the installation cavity into a first installation cavity and a second installation cavity adjacent to each other in the horizontal direction. The second isolation member divides the second installation cavity into an upper installation cavity and a lower installation cavity adjacent to each other in the up-and-down direction. A part of the first driving unit is located in the first installation cavity and another part is located in the upper installation cavity. A part of the second driving unit is located in the first installation cavity and another part is located in the lower installation cavity; The first driving unit includes a first driver, a first synchronous commutation assembly, a first lead screw and a first nut. The first driver is located in the first installation cavity. The first synchronous commutation assembly is partially located in the first installation cavity and partially located in the upper installation cavity. The first lead screw and the first nut are located in the upper installation cavity; the first synchronous commutation assembly is connected to the first driver, the first lead screw is connected to the first synchronous commutation assembly, the first nut is sleeved on the first lead screw. The first driver drives the first synchronous commutation assembly to rotate, the rotation of the first synchronous commutation assembly drives the first lead screw to rotate, the rotation of the first lead screw drives the first nut to move, and the movement of the first nut drives the first center-of-gravity connecting member to move.

2. The in-mold labeling double-drawing arm for heavy use according to claim 1, characterized in that, The output end of the first driving unit is connected with a first mounting member. The first mounting member includes a first mounting portion and a second mounting portion. The first mounting portion is mounted on the output end of the first driving unit, and the second mounting portion is connected with the first gravity center connecting member. The output end of the second driving unit is connected with a second mounting member. The second mounting member includes a third mounting portion and a fourth mounting portion. The third mounting portion is mounted on the output end of the second driving unit, and the fourth mounting portion is connected with the second gravity center connecting member.

3. The heavy-duty in-mold labeling double drawing arm according to claim 1, characterized in that, The first carrier is spaced apart and mounted on the first mounting arm; the second carrier is spaced apart and mounted on the second mounting arm.

4. The in-mold labeling double-drawing arm for heavy use according to claim 1, wherein, The second driving unit includes a second driver, a second synchronous commutation assembly, a second lead screw and a second nut. The second driver is located in the first mounting cavity. The second synchronous commutation assembly is partially located in the first mounting cavity and partially located in the lower mounting cavity. The second lead screw and the second nut are located in the lower mounting cavity. The second synchronous commutation assembly is connected with the second driver. The second lead screw is connected with the second synchronous commutation assembly. The second nut is sleeved on the second lead screw. The second driver drives the second synchronous commutation assembly to rotate. The rotation of the second synchronous commutation assembly drives the second lead screw to rotate. The rotation of the second lead screw drives the second nut to move. The movement of the second nut drives the second gravity center connecting member to move.

5. The in-mold labeling double-drawing arm for heavy use according to claim 1, characterized in that, The first spacer has a hollow hole.

6. The in-mold labeling double-drawing arm for heavy use according to claim 1, characterized in that, A first sliding guiding assembly is provided on the upper surface of the second spacer, and a second sliding guiding assembly is provided on the lower surface of the second spacer. The first driving unit is connected with the first gravity center connecting member through the first sliding guiding assembly, and the second driving unit is connected with the second gravity center connecting member through the second sliding guiding assembly.

7. The heavy-duty in-mold labeling double drawing arm according to claim 6, wherein The first sliding guiding assembly includes a first slide rail and a first slider which are relatively slidably arranged. One of the first slide rail and the first slider is mounted on the upper surface of the second spacer, and the other of the first slide rail and the first slider is connected with the first gravity center connecting member. The second sliding guiding assembly includes a second slide rail and a second slider which are relatively slidably arranged. One of the second slide rail and the second slider is mounted on the lower surface of the second spacer, and the other of the second slide rail and the second slider is connected with the second gravity center connecting member.

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