Sheet material edge folding device

Abstract

The utility model provides a sheet material edge folding device which comprises a pair of edge folding mechanisms oppositely arranged on the inner side of a machine frame in the width direction of a bearing platform, each edge folding mechanism comprises a pressing assembly and an edge folding assembly which are arranged on the machine frame, the pressing assemblies are located above the bearing platform, the lower ends of the pressing assemblies are provided with pressing heads, and the edge folding assemblies are located above the bearing platform. The pressing head is used for pressing the sheet material on the bearing platform. An edge folding part of the edge folding assembly can move towards the pressing head from the position below the bearing platform, so that the end of the edge folding part pushes the end of the corresponding side to be bent and folded upwards relative to the bearing platform, and the sheet material is folded to form an edge folding part. According to the utility model, the folded edge can be pushed to be folded through the obliquely upward linear motion of the edge folding part, and the whole device is simple in structure, higher in structural reliability and lower in operation and maintenance cost; the action process of the device is simple, and the edge folding efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of packaging product processing, and in particular relates to a sheet material folding device. Background Art

[0002] Sheet material is the base material for various packaging products such as luggage and bags. Taking bags as an example, three-dimensional bags are one of the most common bags in daily life and are widely used in the food industry, daily necessities industry, and pharmaceutical industry. They are usually made of plastic, paper materials or a composite of multiple materials and have a three-dimensional shape. Compared with traditional flat bags, they can provide more regular storage space, so that products can be more reasonably placed in the packaging bag, reducing the overall packaging volume, thereby saving storage and transportation space. The formation of three-dimensional bags requires the use of a forming machine to fold the original sheet material through processes such as folding, ironing, indenting, and heat sealing, ultimately forming the bag into a foldable three-dimensional shape. Among them, the folding edge is the key to allowing the bag to maintain its three-dimensional shape after filling the contents. The common method is to add folding edges on both sides or the bottom of the bag and fix these folding edges by heat sealing or bonding.

[0003] When the folding mechanism used in the existing technology folds the end of the sheet material, it is necessary to first lift the folding plate vertically to bend the sheet material into 90 degrees, and then move the folding plate horizontally along the folding direction to flatten the end of the sheet material, thereby pressing out an indentation. This folding method has a complicated action process and low folding efficiency. The structure requires the linkage and coordination of multiple structures. The more complex connection structure has a higher probability of failure, which reduces the reliability of the overall structure and increases the manufacturing and maintenance costs. Utility Model Content

[0004] The purpose of the utility model is to solve the problems in the prior art of the folding device having a complicated operation process, low folding efficiency, complex structure, high probability of failure, which reduces the reliability of the overall structure and increases the manufacturing and maintenance costs.

[0005] In order to solve the above technical problems, the embodiment of the present utility model discloses a sheet material folding device, including a pair of folding mechanisms relatively arranged on the inner side of a frame along the width direction of a load-bearing platform, each folding mechanism including a clamping assembly and a folding assembly arranged on the frame. The clamping assembly is located above the corresponding side portion of the load-bearing platform in the width direction, the upper end of the clamping assembly is vertically movably connected to the frame, the lower end has a clamping head, and the clamping assembly can move away from or close to the load-bearing platform in the vertical direction. The folding assembly includes a folding component and a folding drive component located outside the corresponding side of the load-bearing platform in the width direction and below the load-bearing platform, the output end of the folding drive component is transmission-connected to the folding component and can drive the folding component to move from the bottom of the load-bearing platform toward the clamping head, and the folding component has a push portion on the side close to the load-bearing platform in the width direction. The clamping head can move downward in the vertical direction, pressing the sheet placed on the carrying platform onto the carrying platform, with the folded edges on both sides of the sheet in the width direction protruding from the carrying platform; the folding drive component on each side drives the folding component to move from the bottom of the carrying platform toward the clamping head, and the end of the folding component pushes the folding portion on the corresponding side to fold relative to the carrying platform.

[0006] Using the above technical solution, the supporting platform is used to support the sheet to be folded; the frame is used to fix the various components of the sheet folding device (supporting platform, clamping assembly and folding assembly, etc.); the clamping head of the clamping assembly is used to press the sheet to be folded on the supporting platform to prevent the sheet from being displaced when being pushed for folding and affecting the folding effect; when the clamping head presses the sheet, the folding component can be driven by the folding drive component to move from the bottom of the supporting platform in an inclined upward direction toward the clamping head, and at the same time push the end of the sheet to fold upward along the pre-pressed crease line toward the center of the supporting platform to form a folded portion.

[0007] Therefore, the above solution can achieve the action of pushing the folding portion and folding the folding portion of the sheet material upward toward the center of the supporting platform (i.e., the center of the sheet material) by making the folding component perform an inclined upward linear motion. The entire device uses fewer mechanical structures and is simple in structure, thereby increasing the reliability of the overall structure and reducing operation and maintenance costs. The device's operation process is simple, and each folding operation takes less time, thereby improving the folding efficiency during mass production. In addition, the path of each folding action is a straight line, which is easier to control, and the operation is more stable when applied to three-dimensional bag making equipment.

[0008] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a sheet material folding device, the folding driving component includes a push rod and a cylinder fixed under the supporting platform. In the cross section taken along the vertical direction, the extension direction of the push rod is parallel to the inclination direction of the forming part. One end of the push rod is fixedly connected to the bottom of the folding component, and the other end is fixedly connected to the output end of the cylinder. The output end of the cylinder can drive the push rod and link the pushing part to move from the bottom of the corresponding side of the supporting platform toward the forming part.

[0009] By adopting the above technical solution, since the pushing part of the folding component and the relative surfaces of the forming part of the pressing head are adapted to each other, that is, both are inclined relative to the supporting platform, the extension direction of the cylinder and the push rod is set to be parallel to the inclined direction of the forming part, and the cylinder can push the pushing part of the folding component along its inclined direction toward the inclined direction of the forming part, folding the end of the sheet material and pressing it on the forming part.

[0010] The beneficial technical effects of the utility model are:

[0011] In the sheet folding device provided by the present invention, the folding drive component drives the folding component to perform an oblique upward linear motion from the bottom of the supporting platform toward the pressing head above the supporting platform. During the motion, the end of the folding component pushes the end of the sheet material along the pre-pressed crease line toward the center of the supporting platform to be obliquely folded upward to form a folded portion. The present invention can achieve the action of pushing the end of the sheet material to fold the end of the sheet material upward toward the center of the supporting platform. The entire device adopts fewer mechanical structures and a simple structure, so that the overall structure has higher reliability and lower operation and maintenance costs. In addition, the action process of the device is simple, and less time is spent on each folding, thereby improving the folding efficiency during mass production. In addition, the path of each folding action is a straight line, which is easier to control, and the operation is more stable when applied to three-dimensional bag making equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the overall structure of the sheet folding device provided by an embodiment of the utility model as viewed along the width direction of the sheet;

[0013] Figure 2 for Figure 1 Schematic diagram of the local structure (the folding portion is in a state of being clamped between the shaping portion and the pushing portion);

[0014] Figure 3 A schematic diagram of the three-dimensional structure of a sheet material folding device provided in an embodiment of the utility model;

[0015] Figure 4 This is a schematic structural diagram of a sheet material being folded using the sheet material folding device provided by an embodiment of the utility model.

[0016] Description of reference numerals:

[0017] 1. A bearing platform;

[0018] 2. A folding mechanism;

[0019] 20. A pressing assembly; 201, a pressing head; 2011, a shaping part; 2012, a pressing surface; 202, a connecting part; 203, a pressing driving part; 204, a guide groove;

[0020] 21. A folding assembly; 211, a folding part; 2111, a pushing part; 2112, an overlapping surface; 2113, a wedge angle of the second wedge structure; 2114, a rolling member; 212, a folding driving part; 2121, a pushing rod; 2122, a cylinder;

[0021] 3. A sheet material; 30, a crease line; 31, a folding part;

[0022] 4. A machine frame. DETAILED DESCRIPTION

[0023] The sheet material folding process is a common process in the production of packaging products such as bags and boxes. For example, a three-dimensional bag with a bag opening fold needs to be folded before the bag body is formed. When folding, the end of the sheet material needs to be bent or turned over first, and then the turned over part is extruded to make it overlap with the non-turned over part at an angle of less than 90 degrees or to make them overlap. The existing technology for folding and extruding the folding mechanism has a complex structure, which reduces the reliability of the structure, increases the probability of failure, increases the operation and maintenance cost, and makes the movement process complicated, thereby reducing the folding efficiency and affecting batch production.

[0024] For example, some of the existing folding mechanisms need to first vertically lift the folding plate to bend the sheet material to 90°, and then horizontally move the folding plate along the folding direction to flatten the end of the sheet material, thereby pressing the indentation; another part of the folding mechanism needs to push a complex curved arm structure by a cylinder, and when the one end of the curved arm structure is pushed by the cylinder, the curved arm structure is turned over to drive the folding plate at the other end of the curved arm structure to fold the sheet material, thereby folding the folding edge.

[0025] To solve the above problems, the present application provides a sheet material folding device. The device can push the end of the sheet material to fold to form a folding part by making the folding part move in a straight line upward. The device has fewer mechanical structures, simple structure, higher reliability and lower operation and maintenance cost. The movement process of the device is simple, and the folding time is shorter each time, which can improve the folding efficiency of batch production. In addition, the path of each folding action is a straight line, which is easier to control and more stable when applied to a three-dimensional bag making equipment.

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 3 As shown, the sheet folding device provided by the present invention includes a carrying platform 1 and a pair of folding mechanisms 2. The carrying platform 1 is used to carry the sheet 3 to be folded. The carrying platform 1 is set on a frame 4 ( Figure 1 and Figure 3 The frame 4 is used to fix and support the various components of the sheet folding device (the carrying platform 1, the folding mechanism 2, etc.). The folding mechanism 2 is also set inside the frame 4 and extends along the width direction of the carrying platform 1 ( Figure 1 and Figure 3 The folding mechanism 2 is respectively arranged on both sides of the carrying platform 1, so that the folding mechanism 2 can simultaneously fold the ends of the sheet 3 protruding from both sides of the carrying platform 1 (for example, see Figure 1 The folding operation is performed on the folding portion 31).

[0028] It should be understood that the width direction of the carrying platform 1 is parallel to the length direction of the sheet 3 .

[0029] Each folding mechanism 2 includes a pressing assembly 20 and a folding assembly 21 arranged on the frame 4. The pressing assembly 20 is used to press the sheet 3 onto the carrying platform 1, especially to ensure that the folding line 30 ( Figure 4 The position shown in FIG3 is pressed tightly to prevent the sheet 3 from deflecting and affecting the folding effect during folding. On the other hand, it facilitates the end of the sheet to turn upward around the fold line 30 toward the center of the carrying platform 1 to form a folded portion 31. Figure 1 and Figure 2 As shown, the folding component 21 is used to push the folding portion 31 of the sheet 3 protruding from the edges of both sides of the carrying platform 1 from the bottom of the carrying platform 1. The pushing direction of the folding component 21 can be from Figure 1 The state shown (located below the left and right sides of the carrying platform 1) moves upwards towards the center of the carrying platform 1. Figure 2 In the state shown, the folded edge portion 31 is folded upward and toward the center of the carrying platform 1 relative to the carrying platform 1, and the folded edge portion 31 and the unfolded portion of the sheet 3 form an angle less than 90 degrees.

[0030] Therefore, the device can push the folding portion 31 at the end of the sheet 3 by causing the folding component 21 to move toward the pressing head 201 in a straight line from bottom to top and from the outside to the inside of the supporting platform 1, so that the folding portion 31 is bent upward toward the center of the supporting platform 1 and folded at an angle, thereby forming the folding portion 31. The entire device uses fewer mechanical structures and a simple structure, so that the overall structure has higher reliability and lower operation and maintenance costs. In addition, the device has a simple operation process and takes less time each time to fold, thereby improving the folding efficiency during mass production. In addition, the folding action path of the folding component 21 is a straight line, which is easier to control and more stable when applied to three-dimensional bag making equipment.

[0031] Specifically, if Figure 1 As shown, when the sheet material 3 is in the initial state without being folded, the sheet material 3 needs to be placed on the carrying platform 1, and the folded portions 31 of the sheet material 3 on both sides of the width direction of the carrying platform 1 protrude from the carrying platform 1 (for example, see Figure 1 , the left and right ends of the sheet 3 protrude from the left and right sides of the carrying platform 1 respectively), the position of the fold line 30 of the sheet 3 corresponds to the left and right edges of the carrying platform 1, and when folding is performed subsequently, the folding portion 31 is flipped upward relative to the carrying platform 1 around the fold line 30 (that is, the edge of the carrying platform 1) to achieve folding.

[0032] like Figure 1 As shown, the two clamping assemblies 20 are respectively located above the left and right sides of the supporting platform 1, and the clamping assemblies 20 can move away from or closer to the supporting platform 1 in the vertical direction. The upper end of the clamping assembly 20 is vertically movably connected to the frame 4, and the lower end of the clamping assembly 20 has a clamping head 201, which is mainly used to clamp the sheet material 3. The process of clamping the sheet material 3 and pushing the folding part 31 is as follows: the upper end of the clamping assembly 20 moves downward in the vertical direction and drives the clamping head 201 at its lower end to move closer to the supporting platform 1 until the sheet material 3 is pressed onto the supporting platform 1. During the subsequent folding, the folding part 211 tilts upward and pushes against the folding part 31, so that the folding part 31 is flipped around the crease line 30 relative to the supporting platform 1 to achieve folding.

[0033] The left side of the clamping head 201 above the left side of the carrying platform 1 can have a shaping portion 2011 that extends obliquely relative to the carrying platform 1, and the right side of the clamping head 201 above the right side of the carrying platform 1 can also have a shaping portion 2011 that extends obliquely relative to the carrying platform 1. The shaping portion 2011 is used to provide bottom support for the folding portion 31, so that the folding portion 31 can be pressed on the shaping portion 2011 when pushed by the folding assembly 21, and the folding portion 31 formed after the end of the sheet 3 is folded is opened at a certain preset angle, which is convenient for subsequent steps such as plugging or gluing of the sheet 3. When the clamping head 201 has a shaping portion 2011, the specific process of clamping the sheet material 3 is as follows: the upper end of the clamping assembly 20 moves downward in the vertical direction and drives the clamping head 201 at its lower end to move close to the carrying platform 1 until the sheet material 3 is pressed onto the carrying platform 1. At this time, the outer side of each shaping portion 2011 forms an angle less than 90 degrees with the upper surface of the carrying platform 1, and the outer side of the lower end of the shaping portion 2011 is aligned with the edge of the carrying platform 1, so that the folding portion 31 can be flipped around the crease line 30 relative to the carrying platform 1 to achieve folding during subsequent folding.

[0034] It should be noted that in the initial state of the clamping assembly 20, the clamping head 201 is suspended above the supporting platform 1. After the sheet 3 is conveyed along its conveying direction (parallel to the width direction of the sheet 3) to a position on the supporting platform 1 corresponding to the clamping assembly 20 and the folding assembly 21, the clamping head 201 moves downward to a state of compressing the sheet 3. After the folding is completed, the clamping head 201 is lifted upward to release the sheet 3 to facilitate conveying the sheet 3 to the next workstation. Of course, since the clamping head 201 is located between the folding portion 31 and the unfolded portion of the sheet 3 after the folding is completed, the clamping head 201 can also be first moved back along the width direction of the supporting platform 1 toward the middle of the supporting platform 1, so that the shaping portion 2011 of the clamping head 201 is first away from the folding portion 31, and then the clamping head 201 is lifted upward to release the sheet 3 to facilitate conveying the sheet 3 to the next workstation. This method of first retreating and then lifting can prevent the clamping head 201 from directly lifting up and pushing on the folding portion 31, affecting the folding effect. The movement mode of retreating first and then lifting can be realized by cooperating with the horizontally arranged cylinder and the vertically arranged cylinder respectively, or by setting a guide groove. For example, a guide groove can be opened on the frame 4 supporting the pressing assembly 20. Figure 1 and Figure 2 As shown in the curved guide groove 204, the upper end of the clamping assembly 20 is slidably connected to the guide groove 204. When the upper end of the clamping assembly 20 moves from the left and right sides of the supporting platform 1 to the middle in the guide groove 204, it can be lifted by the inclined transition part of the guide groove 204.

[0035] It should also be noted that the shaping portion 2011 can be an inclined surface extending obliquely relative to the carrying platform 1, and the folding portion 31 can be pressed on the inclined surface after being folded upward. The inclined surface and the sheet-shaped folding portion 31 have a large contact area and a good folding effect. Of course, the shaping portion 2011 can also be a reinforcing rib plate (for example) arranged at intervals along the edge of the carrying platform 1. Figure 3 ), one side edge of each reinforcing rib is inclined relative to the supporting platform 1, and the folded edge 31 can also be pressed against the edge of the reinforcing rib. Whether it is an inclined surface or the edge of the reinforcing rib, the end of the shaping portion 2011 closer to the outside of the supporting platform 1 is closer to the supporting platform 1 in the vertical direction than the other end closer to the middle of the supporting platform 1. The inclination direction can be from top to bottom or from the middle of the supporting platform 1 to the outside. For details, please refer to Figure 2 As shown in the figure, the shaping portion 2011 arranged on the right side of the carrying platform 1 is inclined from top to bottom and from the middle of the carrying platform 1 to the right. Similarly, the shaping portion 2011 arranged on the left side of the carrying platform 1 is inclined from top to bottom and from the middle of the carrying platform 1 to the left.

[0036] The hemming assembly 21 includes a hemming component 211 and a hemming driving component 212. Figure 1 As shown, the folding component 211 and the folding drive component 212 on the left side of the device are located on the left side of the carrying platform 1, the folding component 211 and the folding drive component 212 on the right side of the device are located on the right side of the carrying platform 1, and the folding component 211 and the folding drive component 212 are also located below the carrying platform 1.

[0037] The output end of the folding drive component 212 is transmission-connected to the folding component 211, and the other end of the folding drive component 212 away from the output end is supported and connected to the frame 4. The folding drive component 212 can drive the folding component 211 to move from the bottom of the load-bearing platform 1 toward the pressing head 201, that is, drive the folding component 211 to move upward in a direction inclined relative to the load-bearing platform 1 to push the folding component 211 to push the folding portion 31 to be folded and pressed against the shaping portion 2011. The path of the folding action of the folding component 211 is a straight line, which is easier to control and more stable when used on a three-dimensional bag making device. The folding component 211 on the left side of the load-bearing platform 1 has a push-pull portion 2111 on its right side, and the folding component 211 on the right side of the load-bearing platform 1 also has a push-pull portion 2111 on its left side. The push-pull portion 2111 is used to push the folding portion 31 upward to be folded and press the folding portion 31 against the shaping portion 2011. The shaping portion 2011 on the left side of the load-bearing platform 1 and the surface opposite to the pushing portion 2111 on the same side are adapted to each other, and the shaping portion 2011 on the right side of the load-bearing platform 1 and the surface opposite to the pushing portion 2111 on the same side are adapted to each other, that is, the pushing portion 2111 is inclined relative to the load-bearing platform 1, and the inclination direction is parallel to the inclination direction of the shaping portion 2011 on the same side. In this embodiment, the pushing portion 2111 is preferably an inclined surface inclined relative to the load-bearing platform 1. Setting the pushing portion 2111 as an inclined surface can maximize the contact area between the pushing portion 2111 and the folding portion 31, thereby uniformly applying a pushing force to the folding portion 31, and achieving a better folding effect. When the folding drive component 212 on each side of the load-bearing platform 1 drives the folding component 211 to move obliquely upward from the bottom of the load-bearing platform 1 toward the clamping head 201, the end of the folding component 211 (for example, refer to Figure 2 The upper end of the middle pushing portion 2111 and the side close to the carrying platform 1 pushes the folding portion 31 on the corresponding side to be folded relative to the carrying platform 1, and clamps the folding portion 31 on each side between the pushing portion 2111 and the relative surface of the shaping portion 2011.

[0038] It should be noted that the folding component 211 can specifically be a wedge-shaped block structure or a strip structure having an inclined surface inclined relative to the supporting platform 1, or it can be a flat plate structure inclined relative to the supporting platform 1. The inclined surface of the wedge structure or the plane of the flat plate structure close to the supporting platform 1 is set to be parallel to the inclined direction of the shaping portion 2011. When the folding driving component 212 drives the folding component 211, the inclined surface of the wedge structure or the inclined plane of the flat plate structure can push the folding portion 31 to fold, and clamp the folding portion 31 between the relative surfaces of the pushing portion 2111 and the shaping portion 2011.

[0039] The structure and configuration of the pressing assembly 20 and the folding assembly 21 are described in detail below:

[0040] Regarding the clamping assembly 20:

[0041] like Figure 1 、 Figure 2 and Figure 3 As shown, the upper end of the clamping assembly 20 is a clamping drive component 203, which is mainly used to drive the clamping head 201 below it to move in the vertical direction. The setting direction of the clamping drive component 203 is to extend downward in the vertical direction. The upper end of the clamping drive component 203 is set on the frame 4, and the lower end is connected to the clamping head 201 through the connecting portion 202. In addition to driving the connecting portion 202 and linking the clamping head 201 to move up and down in the vertical direction, when it is necessary to move the clamping head 201 toward the middle of the load-bearing platform 1 along the width direction of the load-bearing platform 1, a driving cylinder or other driving component arranged horizontally along the width direction of the load-bearing platform 1 can be further connected to the clamping drive component 203 to drive the clamping drive component 203 to do horizontal linear motion along the width direction of the load-bearing platform 1, thereby linking the clamping head 201 to move in the horizontal direction.

[0042] It should be noted that the compacting drive component 203 can specifically be a drive cylinder, which is vertically arranged on the frame 4 , and the bottom output end of the drive cylinder is connected to the compacting head 201 through the connecting portion 202 . Of course, the clamping drive component 203 can also be other motors or other mechanisms. The same driving effect can be achieved by cooperating with the motor and the transmission mechanism. The transmission mechanism can be, for example, a chain transmission mechanism, a belt transmission mechanism or a screw-nut mechanism. When the clamping drive component 203 is a chain transmission mechanism, the transmission direction of the transmission chain is set to the vertical direction, and the motor drives the gear to drive the chain to move. The connecting part 202 is connected to the transmission chain, and the movement of the transmission chain is linked to the movement of the clamping head 201 at the bottom of the connecting part 202; when the clamping drive component 203 is a belt transmission mechanism, the transmission direction of the transmission belt is set to the vertical direction, and the connecting part 202 is connected to the transmission belt, and the movement of the transmission belt is linked to the movement of the clamping head 201 at the bottom of the connecting part 202; when the clamping drive component 203 is a screw-nut mechanism, the screw is set to extend in the vertical direction, and the connecting part 202 is connected to the nut. The motor drives the screw rod, so that the nut moves vertically on the screw, which is linked to the movement of the clamping head 201 at the bottom of the connecting part 202.

[0043] The connecting portion 202 may specifically be any one of a connecting rod, a connecting plate or a connecting block, and is mainly used to connect the output end of the compacting drive component 203 and the compacting head 201 .

[0044] Further, if Figure 1 、 Figure 2 and Figure 3As shown, the pressing head 201 at the lower end of the pressing assembly 20 is a first wedge-shaped structure. When the shaping portion 2011 is an inclined surface inclined relative to the supporting platform 1, the shaping portion 2011 is a plane located on one side of the first wedge-shaped structure; the inclined surface (for example, refer to Figure 1 The first wedge-shaped structure is close to the wedge-shaped surface of the supporting platform 1) and its inclination direction is from top to bottom and from the middle of the supporting platform 1 to the outside. Figure 2 As shown in the figure, the shaping portion 2011 arranged on the right side of the carrying platform 1 is inclined from top to bottom and from the middle of the carrying platform 1 to the right. Similarly, the shaping portion 2011 arranged on the left side of the carrying platform 1 is inclined from top to bottom and from the middle of the carrying platform 1 to the left.

[0045] When the shaping portion 2011 is a reinforcing rib plate inclined relative to the carrying platform 1, the shaping portion 2011 is composed of an edge of the reinforcing rib plate inclined relative to the carrying platform 1, and the inclined edge (for example, refer to Figure 1 The first wedge-shaped structure is close to the edge of the side of the carrying platform 1) and is inclined from top to bottom and from the middle of the carrying platform 1 to the outside. For details, please refer to Figure 2 As shown in the figure, the shaping part 2011 arranged on the right side of the carrying platform 1 is tilted from top to bottom and from the middle of the carrying platform 1 to the right. Similarly, the shaping part 2011 arranged on the left side of the carrying platform 1 is tilted from top to bottom and from the middle of the carrying platform 1 to the left. The other side of the first wedge-shaped structure opposite to the shaping part 2011 is formed as a pressing surface 2012, which is used to press the sheet 3 onto the carrying platform 1 at a position aligned with the edge of the carrying platform 1. It should be noted that, as Figure 1 and Figure 2 As shown, in the vertical cross section of the first wedge-shaped structure, the wedge angle of the first wedge-shaped structure is located at one end of the cross section close to the outer side of the supporting platform 1 , and the two sides of the wedge angle are the shaping portion 2011 and the pressing surface 2012 respectively.

[0046] like Figure 1 and Figure 2 As shown, in the vertical direction, the pressing surface 2012 is located on the side of the first wedge-shaped structure close to the supporting platform 1, and is used to press the sheet material 3 onto the supporting platform 1. The shaping portion 2011 is located on the side of the first wedge-shaped structure away from the supporting platform 1, that is, the shaping portion 2011 is located above the pressing surface 2012. The shaping portion 2011 is used to provide support for the folded edge after folding, so that the sheet material 3 is folded at an angle.

[0047] In a vertical cross-section, when the pressing surface 2012 is a plane parallel to the supporting platform 1, the pressing surface 2012 extends parallel to the supporting platform 1, the contact area between the pressing surface 2012 and the sheet 3 is larger, and the pressing stability is better. Of course, the pressing surface 2012 can also be an inclined surface inclined relative to the supporting platform 1, as long as the bottom of the inclined surface can press the sheet 3 onto the supporting platform 1 at a position aligned with the edge of the supporting platform 1.

[0048] In the cross section taken along the vertical direction, since the shaping portion 2011 extends obliquely from top to bottom and from the middle of the supporting platform 1 to the outside, in the width direction of the supporting platform 1, the lower end of the shaping portion 2011 is closer to the left and right edges of the supporting platform 1 than its upper end, and the lower end of the shaping portion 2011 coincides with the crease line 30.

[0049] like Figure 4 As shown, the sheet 3 is pre-pressed with crease lines 30 ( Figure 4 The dotted line in the figure), the portion between the crease line 30 and the two side edges of the sheet 3 is an elongated strip structure, that is, the folding portion 31. In order to make the shaping portion 2011 of the pressing head 201 more compatible with the folding portion 31, in one embodiment of the present invention, as shown in FIG. Figure 3 As shown, the first wedge-shaped structure can be configured as a first strip-shaped member extending along the length of the supporting platform 1 (i.e., the width of the sheet 3). The shaping portion 2011 on the first strip-shaped member also extends along the length of the supporting platform 1, so that the folded portion 31 can be completely pressed against the shaping portion 2011. When the first wedge-shaped structure is a first strip-shaped member, the first strip-shaped member is vertically movably connected to the lower end of the pressing assembly 20 via the connecting portion 202.

[0050] It should also be noted that in order to make the pushing portion 2111 more compatible with the shaping portion 2011 to improve the folding quality, the pushing portion 2111 can be set as an inclined surface extending parallel to the shaping portion 2011, that is, when the shaping portion 2011 is an inclined surface inclined relative to the supporting platform 1, the inclination direction of the inclined surface of the pushing portion 2111 is parallel to the inclination direction of the shaping portion 2011; when the shaping portion 2011 is a reinforcing rib plate inclined relative to the supporting platform 1, the inclination direction of the inclined surface of the pushing portion 2111 is parallel to the edge of the reinforcing rib plate inclined relative to the supporting platform 1.

[0051] About Folding Component 21:

[0052] The folding drive component 212 is mainly used to drive the folding component 211 to perform an inclined linear motion to push the folding portion 31 to fold. The folding component 211 is used to push the folding portion 31. In this embodiment, the folding drive component 212 cooperates with the folding component 211 to adopt a simpler structure and simple linear motion to fold the sheet material 3. The entire device uses fewer mechanical structures and a simple structure, so the overall structure has higher reliability and lower operation and maintenance costs. In addition, the device has a simple operation process and takes less time each time to fold, which can improve the folding efficiency during mass production. The folding action path of the folding component 211 is a straight line, which is easier to control and works more stably when applied to three-dimensional bag making equipment.

[0053] In one specific embodiment of the present invention, Figure 1 and Figure 2 As shown, the folding drive component 212 includes a push rod 2121 and a cylinder 2122 fixed below the supporting platform 1. The cylinder 2122 is used to output the power of linear motion, and the push rod 2121 is used to transmit the driving force of the output end of the cylinder 2122 to the folding component 211. In the cross section taken along the vertical direction, the extension direction of the push rod 2121 is parallel to the inclination direction of the shaping portion 2011. One end (upper end) of the push rod 2121 is fixedly connected to the bottom of the folding component 211, and the other end (lower end) is fixedly connected to the output end of the cylinder 2122. The output end of the cylinder 2122 can drive the push rod 2121 and link the push portion 2111 to move from the lower side of the corresponding side of the supporting platform 1 toward the shaping portion 2011. The specific driving direction is Figure 2 and Figure 3 The inclined arrow is shown in the Y direction.

[0054] Since the pushing portion 2111 of the folding component 211 and the relative surfaces of the forming portion 2011 of the clamping head 201 are adapted to each other, that is, both are inclined relative to the supporting platform 1, the extension direction of the cylinder 2122 and the push rod 2121 is set to be parallel to the inclined direction of the forming portion 2011, and the cylinder 2122 can push the push rod 2121 along its inclined direction, thereby pushing the pushing portion 2111 of the folding component 211 toward the inclined direction of the forming portion 2011, folding the fold and clamping it between the relative surfaces of the pushing portion 2111 and the forming portion 2011.

[0055] In another specific embodiment of the present invention, the hemming drive component 212 can be a linear motor, which can also achieve linear drive, as long as the extension direction of the linear motor is arranged to be inclined relative to the supporting platform 1 according to the desired hemming angle. Specifically, in a cross-section taken along the vertical direction, the extension direction of the linear motor's mover is parallel to the inclination direction of the shaping portion 2011, and the output end of the mover is fixedly connected to the bottom of the hemming component 211. The mover can drive the push portion 2111 to move from the lower side of the corresponding side of the supporting platform 1 toward the shaping portion 2011. It should be noted that the end of the linear motor away from the output end of the mover is supported and connected to the frame 4.

[0056] It should be noted that the hemming drive component 212 can also be a motor, and the motor can achieve the same driving effect in conjunction with various transmission mechanisms. For example, the transmission mechanism can be any one of a cam mechanism and a rack and pinion mechanism. The cam mechanism is driven by the motor to rotate, and the edge of the cam mechanism pushes the hemming component 211 to make an oblique upward linear motion; the gear is driven by the motor to rotate, and the gear is linked to the rack and drives the hemming component 211 to make an oblique upward linear motion. Alternatively, when the hemming drive component 212 is a horizontally arranged cylinder, a swing arm mechanism can be connected to the output end of the cylinder, and the output end of the cylinder pushes the swing arm to swing in a vertical plane to push the hemming component 211 to make an oblique upward linear motion.

[0057] Further, if Figure 1 and Figure 2 As shown, the folding part 211 is a second wedge-shaped structure, and the second wedge-shaped structure has at least one inclined surface inclined relative to the supporting platform 1 as a push portion 2111, and the other side of the second wedge-shaped structure opposite to the push portion 2111 is formed as a lap surface 2112, and the lap surface 2112 is used to overlap the folding portion 31 of the sheet material 3 protruding from the edge of the supporting platform 1. It should be noted that the lap surface 2112 can be a horizontal plane parallel to the supporting platform 1, or it can be an inclined surface inclined relative to the supporting platform 1, as long as the folding portion 31 can be overlapped thereon. It should also be noted that, as Figure 1 and Figure 2 As shown, in the cross section of the second wedge-shaped structure along the vertical direction, the wedge angle 2113 of the second wedge-shaped structure is located at one end of the cross section close to the middle of the supporting platform 1, and the two sides of the wedge angle 2113 of the second wedge structure are respectively a pushing portion 2111 and a lap surface 2112. The function of the wedge angle 2113 of the second wedge structure is to interact with the wedge angle of the first wedge structure to push the folded edge portion 31 to fold.

[0058] like Figure 1 and Figure 2 As shown, in the vertical direction, the overlap surface 2112 is located on the upper side of the second wedge-shaped structure, and the push portion 2111 is located on the lower side of the overlap surface 2112. Figure 1The folding component 211 is shown in the initial state. The pressing head 201 presses the sheet 3 onto the carrying platform 1. The folding component 211 is located below the left and right sides of the carrying platform 1 in the width direction. The folding portion 31 overlaps the overlapping surface 2112 and has not been folded. The pushing portion 2111 is located on the side of the second wedge-shaped structure close to the carrying platform 1. The output end of the folding drive component 212 (for example, see Figure 1 The cylinder 2122 in the embodiment of the present invention can drive the second wedge-shaped structure from the corresponding side (left / right) of the supporting platform 1 to the first wedge-shaped structure (see, for example, Figure 1 As the pressing head 201 in the second wedge-shaped structure moves, the wedge angle 2113 of the second wedge-shaped structure can push the corresponding side of the folded portion 31 against the supporting platform 1, causing it to fold relative to the supporting platform 1. It should be noted that the inclination direction of the wedge-shaped surface of the second wedge-shaped structure that pushes against the folded portion 31 is consistent with the inclination direction of the shaping portion 2011, both sloping from top to bottom and from the center of the supporting platform 1 toward the right.

[0059] like Figure 2 As shown, when the folding drive component 212 drives the second wedge-shaped structure to move obliquely upward and pushes the folding portion 31 to be folded between the surfaces opposite to the shaping portion 2011 and the pushing portion 2111, the shaping portion 2011 forms a support for the bottom of the folding portion 31, and the pushing portion 2111 can press the folding portion 31 against the shaping portion 2011, so that the sheet 3 is folded to form a fold at a certain angle. The angle of the folding portion 31 can be 5 degrees, 15 degrees, 25 degrees, 35 degrees or any other angle less than 90 degrees. Those skilled in the art can set it according to actual conditions, and this embodiment does not make specific restrictions here.

[0060] In order to make the folding part 211 (second wedge-shaped structure) more compatible with the strip-shaped folding portion 31, in one embodiment of the present invention, as shown in FIG. Figure 3 As shown, the second wedge-shaped structure can be configured as a second strip-shaped member extending along the length of the support platform 1 (i.e., the width of the sheet), and the abutting portion 2111 on the second strip-shaped member also extends along the length of the support platform 1, so that the folding portion 31 can be completely pushed by the abutting portion 2111 until it is pressed against the surface of the shaping portion 2011. When the second wedge-shaped structure is a second strip-shaped member, the output end (cylinder 2122) of the folding drive component 212 is in driving connection with the bottom of the second strip-shaped member to drive the second strip-shaped member to move from the bottom of the corresponding side of the support platform 1 toward the first wedge-shaped structure (i.e., the pressing head 201), with the movement direction being the direction in which the shaping portion 2011 is tilted relative to the support platform 1.

[0061] like Figure 2As shown, in one specific embodiment of the present invention, the folding part 211 also includes a rolling member 2114 arranged at the wedge angle 2113 of the second wedge-shaped structure, the axis of the rolling member 2114 is parallel to the length direction of the supporting platform 1, and when the second wedge-shaped structure moves from the bottom of the supporting platform 1 toward the first wedge-shaped structure, the rolling member 2114 can roll on the corresponding surface of the folding part 31 along the inclined direction of the shaping part 2011.

[0062] It should be noted that the rolling element 2114 can be a roller or a roller extending along the length direction of the supporting platform 1. The roller or roller can roll on the surface of the folding portion 31 to press the folding portion 31 against the surface of the forming portion 2011. The rolling element 2114 can also reduce the friction between the folding portion 31 and prevent damage to the sheet material 3.

[0063] In another specific embodiment of the present invention, the wedge angle 2113 of the second wedge-shaped structure can also be formed as an arcuate surface. Providing the arcuate surface at the wedge angle 2113 of the second wedge-shaped structure can prevent the wedge angle 2113 of the second wedge-shaped structure from being too sharp and damaging the sheet material 3 when pushing against it. In a cross section taken along the vertical direction, the upper and lower ends of the arcuate surface are smoothly connected to the pushing portion 2111 and the overlapping surface 2112, respectively. When the second wedge-shaped structure moves from the bottom of the supporting platform 1 toward the first wedge-shaped structure, the arcuate surface can slide on the corresponding surface of the folded edge portion 31 along the inclined direction of the shaping portion 2011.

[0064] In order to facilitate the operator to understand the method of using the sheet material folding device provided in this embodiment, one specific practicable process of the sheet material folding device is described below with reference to the accompanying drawings:

[0065] The folding process mainly includes a pressing step, a folding step and a lifting step.

[0066] The specific pressing step is as follows: when the sheet material 3 that needs to be folded is conveyed to the folding station of the carrying platform 1, the folding part 31 of the sheet material 3 protrudes from both sides of the carrying platform 1, and the driving cylinder of the clamping assembly 20 on each side of the carrying platform 1 drives the clamping head 201 at the lower end to move vertically downward to press the sheet material 3 onto the carrying platform 1, and the end of the forming part 2011 close to the outside of the carrying platform 1 (that is, the end where the wedge angle of the first wedge-shaped structure is located) is aligned with the two side edges of the carrying platform 1.

[0067] When the folding part 211 is in the initial state, Figure 1 As shown, the folding part 211 is located below the left and right sides of the carrying platform 1 in the width direction, the folding portion 31 overlaps the overlapping surface 2112 and has not been folded over, and the pushing portion 2111 is located on the side of the second wedge-shaped structure close to the carrying platform 1.

[0068] The folding steps are as follows: the power output end (cylinder 2122) of the folding drive component 212 drives the push rod 2121, and the linked folding component 211 (second wedge-shaped structure) moves upward from the corresponding side (left / right) of the supporting platform 1 toward the shaping portion 2011 of the pressing head 201 (first wedge-shaped structure) (movement direction is Figure 1 、 Figure 2 As shown in the inclined arrow Y direction), when the end of the folding part 211 (the wedge angle 2113 of the second wedge-shaped structure) moves to contact the corresponding edge of the supporting platform 1, it interacts with the end of the clamping head 201 (the wedge angle of the first wedge-shaped structure) to clamp the sheet 3 at the folding line 30. As the folding part 211 (the second wedge-shaped structure) continues to move, the pushing part 2111 pushes the folding part 31 to fold the folding part 31 to a certain angle (technical personnel in this field can make reasonable settings according to the folding needs), and presses the folding part 31 on the shaping part 2011, so that the folding part 31 is clamped between the pushing part 2111 and the shaping part 2011, and the folding part can be folded.

[0069] The lifting step is specifically as follows: the pressing driving component 203 (driving cylinder) drives the connecting portion 202 and the pressing head 201 to move and lift in the vertical direction, loosening the sheet material 3 so that the sheet material 3 can be transported to the next station.

[0070] It should be noted that, in addition to the implementation methods of the present invention described in the above-mentioned specific embodiments, those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation method. On the contrary, the purpose of introducing the utility model in conjunction with the implementation method is to cover other options or modifications that may be extended based on the claims of the present utility model. In order to provide an in-depth understanding of the present utility model, the following description will contain many specific details. The present utility model can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present utility model, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other.

[0071] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0072] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the utility model.

[0073] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0074] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0075] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the present invention should not be construed as being limited to these descriptions. Those skilled in the art may make various changes in form and detail, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A sheet folding device, characterized in that: include: A pair of folding mechanisms are arranged on the inner side of the frame relative to each other along the width direction of the carrying platform, each of the folding mechanisms includes a pressing component and a folding component arranged on the frame; wherein The pressing assembly is located above the corresponding side portion of the carrying platform in the width direction, the upper end of the pressing assembly is vertically movably connected to the frame, and the lower end has a pressing head, and the pressing assembly can move away from or approach the carrying platform in the vertical direction; The folding assembly includes a folding component and a folding driving component located outside the corresponding side of the carrying platform in the width direction and below the carrying platform, the output end of the folding driving component is transmission-connected with the folding component and can drive the folding component to move from below the carrying platform toward the pressing head, and the folding component has a pushing portion on the side close to the carrying platform in the width direction; and The clamping head can move downward in the vertical direction to press the sheet placed on the supporting platform onto the supporting platform, with the folded edges on both sides of the sheet in the width direction protruding from the supporting platform; the folding driving component on each side drives the folding component to move from the bottom of the supporting platform toward the clamping head, and the end of the folding component pushes the folding portion on the corresponding side to fold relative to the supporting platform.

2. The sheet material folding device according to claim 1, characterized in that: The pressing head has a shaping portion extending obliquely relative to the carrying platform on a side away from the carrying platform in the width direction; the opposing surfaces of the pushing portion and the shaping portion in the width direction are adapted to each other; the folding portion is clamped between the opposing surfaces of the pushing portion and the shaping portion; and The pressing head is a first wedge-shaped structure, and the two opposite sides of the first wedge-shaped structure are respectively formed as the shaping portion and the pressing surface, and In the vertical direction, the pressing surface is located on a side of the first wedge-shaped structure close to the carrying platform, pressing the sheet material onto the carrying platform, and the shaping portion is located on a side of the first wedge-shaped structure away from the carrying platform; in In a cross section taken along the vertical direction, the pressing surface extends parallel to the carrying platform, the shaping portion extends obliquely relative to the carrying platform, and one end of the shaping portion closer to the outer portion of the corresponding side of the carrying platform is closer to the carrying platform than the other end closer to the middle of the carrying platform; and The pushing portion is an inclined surface extending parallel to the shaping portion.

3. The sheet material folding device according to claim 2, characterized in that: The first wedge-shaped structure is a first strip-shaped member extending along the length direction of the bearing platform. The first strip-shaped member is vertically movably connected to the lower end of the pressing assembly through a connecting portion.

4. The sheet material folding device according to claim 2, characterized in that: The folding part is a second wedge-shaped structure, and the two opposite sides of the second wedge structure are respectively formed as the pushing portion and the overlapping surface, and the wedge angle of the second wedge structure can push the folding portion on the corresponding side to fold relative to the bearing platform, and In the vertical direction, the overlapping surface is located on the upper side of the second wedge-shaped structure and is used to overlap the folding portion. The pushing portion is located on the lower side of the overlapping surface and on the side of the second wedge-shaped structure close to the supporting platform. The output end of the folding drive component can drive the second wedge-shaped structure to move from the bottom of the corresponding side of the supporting platform toward the first wedge-shaped structure.

5. The sheet material folding device according to claim 4, characterized in that: The hemming component further includes a rolling element provided at a wedge angle of the second wedge-shaped structure, wherein the axis of the rolling element is parallel to the length direction of the carrying platform, and when the second wedge-shaped structure moves from below the carrying platform toward the first wedge-shaped structure, the rolling element can roll on the corresponding surface of the hemming portion along the inclined direction of the shaping portion; Alternatively, the wedge angle of the second wedge-shaped structure is formed into an arc-shaped surface, and in a cross section taken along the vertical direction, the upper and lower ends of the arc-shaped surface are smoothly connected to the pushing portion and the overlapping surface respectively, and when the second wedge-shaped structure moves from under the supporting platform toward the first wedge-shaped structure, the arc-shaped surface can slide on the corresponding surface of the folding portion along the inclined direction of the shaping portion.

6. The sheet material folding device according to claim 5, characterized in that: The second wedge-shaped structure is a second strip-shaped component extending along the length direction of the supporting platform. The output end of the folding drive component is transmission-connected to the bottom of the second strip-shaped component, and can drive the second strip-shaped component to move from the bottom of the corresponding side of the supporting platform toward the first wedge-shaped structure.

7. The sheet material folding device according to claim 2, characterized in that: The folding drive component includes a push rod and a cylinder fixed under the supporting platform. In the cross section taken in the vertical direction, the extension direction of the push rod is parallel to the inclination direction of the forming part. One end of the push rod is fixedly connected to the bottom of the folding component, and the other end is fixedly connected to the output end of the cylinder. The output end of the cylinder can drive the push rod and link the pushing part to move from the bottom of the corresponding side of the supporting platform toward the forming part.

8. The sheet material folding device according to claim 2, characterized in that: The folding drive component is a linear motor. In a cross section taken along the vertical direction, the extension direction of the mover of the linear motor is parallel to the inclination direction of the forming part. The output end of the mover is fixedly connected to the bottom of the folding component. The mover can drive the pushing part to move from the bottom of the corresponding side of the supporting platform toward the forming part.

9. The sheet material folding device according to any one of claims 1 to 8, characterized in that: The upper end of the clamping assembly is a clamping drive component, the upper end of the clamping drive component is arranged on the frame, extends downward in the vertical direction, and the lower end is connected to the clamping head through a connecting part. The clamping drive component can drive the connecting part and link the clamping head to move up and down in the vertical direction.

10. The sheet material folding device according to claim 9, characterized in that: The pressing driving component is a driving cylinder.

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