Packaging bag forming die

Abstract

The packaging bag forming mold facilitating bag body demolding and rapid width adjustment comprises a mold core (1), mold side plates (2), sliding assemblies (3), limiting pieces (4) and a power source (5), the two mold side plates are arranged on the left side and the right side of the mold core in the width direction through the sliding assemblies correspondingly, and a concave part (213) is formed in the outer side of each mold side plate in the width direction; positioning parts (311) which are matched with each other are arranged on the sliding assembly and the limiting part, and the power source is arranged on the mold core and can push and pull the limiting part, so that the limiting part and the positioning parts on the sliding assembly get close to each other to be meshed or get away from each other to be released from meshing. According to the invention, the connected part of the side surface of the bag body or the side surface and the bottom corner part are naturally extruded towards the concave part of the mold in the forming process, and when the edge sealing forming part is withdrawn, the side edge connecting part of the bag body naturally pops up outwards to generate a gap with the mold, so that the bag body cannot be tightly attached to the mold, and the production efficiency is improved. The separation with the mold is more convenient.

Description

Technical Field

[0001] The invention relates to the field of bag body manufacturing and processing of packaging bags, and in particular to a packaging bag forming mold which is convenient for bag body demoulding and rapid width adjustment. Background Art

[0002] Packaging bags include paper bags, non-woven fabrics or bags made of other materials, side-connected bags (such as Figure 7 ) During the forming process, the bag body needs to be folded on both sides in a U-shaped state. The production equipment needs to be equipped with a special forming mold that extends into the bag body. The forming mold also needs side panels on both sides with a spacing equal to the width of the bag body to facilitate the inner side to support the side of the bag body for folding and forming.

[0003] For example, the Chinese invention patent with announcement number CN212353094U, entitled "An adjustable mold for forming a three-dimensional bag and a three-dimensional bag forming machine", discloses an adjustable mold for forming a three-dimensional bag, including an inner mounting plate, with side plates connected to both sides of the inner mounting plate, the side plates can be translated left and right relative to the inner mounting plate, and the side plates can be detached and replaced relative to the inner mounting plate. Figure 1 It can be seen that the side panels are smooth on the front, back and outer surfaces. When the bag body is formed outside the mold, the sides of the bag body are connected and are completely wrapped outside the mold on all four sides. This will cause the bag body to be in close contact with the mold and make it difficult to demold.

[0004] In order to solve this problem, the bag body will have a taper on the side that is smaller at the bottom and larger at the top. Either the front and back sides do not completely fit the mold, or the side connection is skewed so that the side of the bag body does not completely fit the mold. The bag body formed in this way is not beautiful enough and its strength will be affected.

[0005] In addition, due to the use of an adjustable screw rod structure, the above patented technology has the problem of inaccurate locking position when adjusting the mold width, and the operation is relatively cumbersome. Summary of the invention

[0006] In view of the above-mentioned shortcomings in the prior art, the present invention provides a packaging bag forming mold which is convenient for bag body demoulding and quick width adjustment.

[0007] The technical solution of the present invention is: a packaging bag forming mold, including a mold core, a mold side plate, a sliding assembly, a stopper and a power source, the two mold side plates are respectively arranged on the left and right sides of the mold core in the width direction through the sliding assembly, and each mold side plate is provided with a recessed portion on the outer side in the width direction; mutually cooperating positioning components are arranged on the sliding assembly and the stopper, and the power source is arranged on the mold core and can push and pull the stopper, so that the stopper and the positioning component on the sliding assembly are close to each other to engage, or are separated from each other to disengage. By arranging the recessed portion on the outer side of the mold side plate, the processed bag body is naturally pressed toward the recessed portion of the mold during the forming process, and when the edge seal forming component is withdrawn, the side connection part of the bag body will naturally pop out and disengage from the recessed portion, and a gap will be generated between the part and the mold, so that the bag body will not fit tightly with the mold, and it is more convenient to disengage from the mold; in addition, through the mutually cooperating positioning components, the sliding assembly and the stopper can be quickly engaged or separated, so that the width of the mold can be quickly adjusted.

[0008] Furthermore, the mold side plate includes a side support plate and a cross support plate. The cross support plates on the front and rear sides of the side support plate are respectively provided with transverse support surfaces on the outside relative to the mold core, which are used to contact the inner surface of the front or rear side of the bag body to be processed; the side support plate includes a front support bag part, a rear support bag part and a recessed part, and the outer side surfaces of the front support bag part and the rear support bag part of the same side support plate jointly form a longitudinal support surface.

[0009] Furthermore, the recessed portion extends to the bottom of the mold side plate, and the bottom edges of the front support pocket and the rear support pocket are spaced apart from the bottom edge of the mold side plate by an accommodating portion.

[0010] Furthermore, the outer surface of the recess is a plane, the vertical plane where the lowest point is located is the same plane as the vertical plane where the highest point is located, and the plane is located on the inner side of the longitudinal support surface; the plane where the recess (213) is located has a height difference of 0.3-2mm with the longitudinal support surface.

[0011] Optionally, the front side of the concave portion is the front support pocket portion, and the rear side is the rear support pocket portion, and the front support pocket portion and the rear support pocket portion are both in the shape of vertical strips, and the concave portion forms an "inverted T" shape. The vertical strips can cooperate with the horizontal support plate to keep the four edges of the bag body vertical during molding, and the "inverted T"-shaped concave portion creates a gap between the side connection part and the bottom corner part of the bag body and the mold after molding, which is convenient for demoulding.

[0012] Furthermore, the sliding assembly includes a plurality of positioning sliders and multi-layer slide rails, each positioning slider is slidably disposed on the multi-layer slide rails, each mold side plate is fixedly connected to at least one positioning slider, and each positioning slider is provided with a plurality of positioning components that can engage or disengage with the limiting member. Due to the limiting effect of the limiting member, the positioning slider cannot move left and right on the multi-layer slide rail when engaged, and can only move left and right when disengaged.

[0013] Optionally, the multi-layer slide rail includes a plurality of guide rails arranged in parallel and a middle rail slidably arranged inside each guide rail, each of the guide rails is fixed on the mold core, and each of the middle rails is slidably connected to a positioning slider.

[0014] Optionally, each of the mold side plates on the left and right sides is connected to at least two of the positioning slide blocks, and the height positions of the two positioning slide blocks are staggered.

[0015] Furthermore, the positioning component is a tooth-shaped protrusion or a circular hole-cylinder pair.

[0016] Furthermore, the distance between every two adjacent tooth-shaped protrusions or circular hole-cylinder pairs is 1-10 mm.

[0017] Optionally, mutually limiting blocking members are respectively provided on opposite sides of the guide rail and the middle rail, and mutually limiting blocking members are also respectively provided on opposite sides of the middle rail and the positioning slide block.

[0018] Optionally, the outward travel of the middle rail along the guide rail does not exceed half of the length of the guide rail, and the outward travel of the positioning slider along the middle rail does not exceed half of the length of the middle rail.

[0019] Furthermore, the power source arranged at the bottom of the mold core is driven horizontally and is connected to a steering connection pair. The steering connection pair has a transmission connection surface matching the limit member, which is used to convert the horizontal drive of the power source into the up and down movement of the limit member.

[0020] Optionally, the steering connection pair consists of an oblique guide block and an oblique matching block, the oblique guide block is connected to a power source, the limit piece is connected to the oblique matching block or is integrally formed, the inclined surface of the oblique guide block and the inclined surface of the oblique matching block fit each other, so that the left and right movement of the oblique guide block is converted into the up and down movement of the oblique matching block.

[0021] Since the present invention adopts the above technical solution, it has significant technical effects compared with the prior art:

[0022] 1. The present invention adopts a structural design in which a concave portion is made on the outer side of the mold side plate, so that the side of the bag body will not fit tightly with the mold, and it is convenient to separate from the mold.

[0023] 2. Due to the mold structure of the present invention, even if the bag body is tightly attached to the mold, it is easy to demould. The formed bag body does not need to be tapered on the front or side. The bag shape can be more neatly processed to ensure that each side edge connected to the bag body is vertical relative to the bottom surface, and the side connection part is also straight, which is beneficial to the aesthetics and bearing capacity of the bag body.

[0024] 3. The structure of the multi-layer slide rail of the present invention can achieve that the adjustment range of the mold surface width can be extended to both sides close to the length of the multi-layer slide rail body, the adjustment range is greatly increased, and the applicability of the mold is increased.

[0025] 4. The mold structure of the present invention is evenly spaced with positioning components, which can facilitate the staff to adjust the width of the mold according to the specific width of the bag body. Each time, they only need to calculate how many positioning components need to be moved inward or outward. Compared with the traditional motor-driven screw adjustment accuracy is difficult to ensure, or the earlier bolt fixing method is cumbersome to operate and difficult to measure, the adjustment scheme of the present invention is very simple to calculate and adjust. Because there is no requirement for the precision of the power source, the equipment cost will be greatly reduced, saving time for changing molds in production and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of a packaging bag forming mold of the present invention.

[0027] Figure 2 yes Figure 1 Schematic diagram of the structure shown from a front view angle.

[0028] Figure 3 yes Figure 1 Schematic diagram of the structure shown from a left perspective.

[0029] Figure 4 It is a structural schematic diagram of an embodiment of a mold side plate of a packaging bag forming mold of the present invention.

[0030] Figure 5 yes Figure 1 Exploded view of the structure shown.

[0031] Figure 6 It is a structural schematic diagram of an embodiment of a steering connection pair of a packaging bag forming mold of the present invention.

[0032] Figure 7 This is a schematic diagram of the packaging bag structure involved in the present invention.

[0033] The names of the parts indicated by the numerical labels in the above drawings are as follows: Among them, 1. mold core; 2. mold side plate; 21. side support plate; 211. front support pocket; 212. rear support pocket; 213. recess; 214. accommodating portion; 22. cross support plate; 221. transverse support surface; 23. corner support; 3. sliding assembly; 31. positioning slider; 311. positioning component; 32. multi-layer slide rail; 321. guide rail; 322. middle rail; 4. limit member; 5. power source; 61. oblique guide block; 62. oblique matching block. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-6 The present invention is further described in detail with embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions.

[0035] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention. The terms and words used in the following description and claims are not limited to the literal meanings, but are used only by the inventors to enable a clear and consistent understanding of the present invention. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present invention is provided for the purpose of illustration only and not for the purpose of limiting the present invention as defined in the appended claims and their equivalents.

[0036] The orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Although ordinals such as "first", "second", etc. will be used to describe various components, those components are not limited here. The term is only used to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component without departing from the teachings of the inventive concept. The term "and / or" used herein includes any and all combinations of one or more associated listed items.

[0037] like Figure 1-5As shown, the present invention provides a packaging bag forming mold that is convenient for bag demoulding and quick width adjustment, including a mold core 1, a mold side plate 2, a sliding assembly 3, a limiter 4 and a power source 5. The two mold side plates 2 are respectively arranged on the left and right sides of the mold core 1 in the width direction through the sliding assembly 3, and each mold side plate 2 is provided with a recess 213 on the outer side in the width direction for facilitating bag demoulding; mutually cooperating positioning components 311 are provided on the sliding assembly 3 and the limiter 4, and the power source 5 is fixedly arranged on the mold core 1 and can push and pull the limiter 4, so that the limiter 4 and the positioning component 311 on the sliding assembly 3 are close to each other and meshed, or moved away from each other and disengaged.

[0038] By setting a recess 213 on the outer side of the mold side plate 2, the processed bag body is naturally squeezed toward the recess 213 of the mold during the molding process. When the edge sealing molding component is withdrawn, the side connecting part of the bag body will naturally pop out and separate from the recess 213. A gap will be generated between this part of the bag body and the mold, and the bag body will not fit tightly between the mold, which facilitates the separation of the bag body from the mold. In addition, through the cooperation of the positioning components 311, the sliding component 3 and the limit member 4 can be quickly engaged or separated. After separation, the relative positions of the sliding component 3 and the limit member 4 can be quickly adjusted, thereby achieving the purpose of quickly adjusting the mold width.

[0039] like Figure 1 , Figure 3 and Figure 4 As shown, the mold side plate 2 includes a side support plate 21 and a transverse support plate 22. The transverse support plates 22 on the front and rear sides of the side support plate 21 are respectively provided with transverse support surfaces 221 on the outer side relative to the mold core 1, which are used to contact the inner surface of the front side or the rear side of the bag to be processed; the side support plate 21 includes a front support pocket 211, a rear support pocket 212 and a recess 213. The outer side surfaces of the front support pocket 211 and the rear support pocket 212 of the same side support plate 21 jointly form a longitudinal support surface. The longitudinal support surface is respectively connected with the transverse support surfaces 221 on the front and rear sides to form a support angle 23. The projection of the support angle 23 on the horizontal plane is a right angle. The outer surface of the recess 213 at least includes a support surface that provides support force for the side of the bag body when it is centrally sealed or bonded. The vertical plane where the lowest point of the recess 213 is located is located on the inner side of the longitudinal support surface, and the vertical plane where the highest point of the recess 213 is located does not exceed the longitudinal support surface. The side bracing plate 21 and the cross bracing plate 22 can be made into separate types but must be connected to each other, or they can be formed in one piece.

[0040] The concave portion 213 extends to the bottom of the bag support member 2, and the bottom edges of the front support bag portion 211 and the rear support bag portion 212 have a receiving portion 214 at a distance from the bottom edge of the mold side plate 2. The receiving portion 214 is a plane, so that the folded tongue portion of the bag body is turned up and covered on the receiving portion 214, and the concave portion 213 is a larger area, which includes the receiving portion 214.

[0041] The outer surface of the recess 213 is a plane, and the vertical plane where the lowest point is located is the same plane as the vertical plane where the highest point is located. The plane is located on the inner side of the longitudinal support surface.

[0042] The plane where the recess 213 is located has a height difference of 0.3-2 mm with the longitudinal support surface. The height difference can be any value such as 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, etc., and is preferably 0.5 mm.

[0043] The front side of the concave portion 213 is the front support pocket portion 211, and the rear side is the rear support pocket portion 212. The front support pocket portion 211 and the rear support pocket portion 212 are both in the shape of vertical strips, and the concave portion 213 forms an "inverted T" shape. The vertical strips can cooperate with the horizontal support plate 22 to keep the four edges of the bag body vertical during molding, and the "inverted T"-shaped concave portion 213 allows the side connection part and the bottom corner part of the bag body to have a gap with the mold after molding, which is convenient for demoulding.

[0044] like Figure 1 , Figure 2 and Figure 5 As shown, the sliding assembly 3 includes a plurality of positioning sliders 31 and a multi-layer slide rail 32. Each positioning slider 31 and the multi-layer slide rail 32 form a sliding pair, and the positioning slider 31 is slidably arranged on the multi-layer slide rail 32. The multi-layer slide rail 32 includes a plurality of guide rails 321 fixedly arranged in parallel on the mold core 1 and a middle rail 322 slidably arranged inside each guide rail 321. Each middle rail 322 and a positioning slider 31 form a sliding pair, and the two are slidably connected.

[0045] Optionally, each of the mold side plates 2 on the left and right sides is connected to at least two positioning sliders 31 , and the height positions of the two positioning sliders 31 are staggered.

[0046] Since the positioning slider 31 and the stopper 4 are in an up-and-down position relationship rather than an inside-outside position relationship, the thickness of the mold can be greatly reduced, and it can be applied to the adjustment of bags of more sizes. In one embodiment, the multi-layer slide rail 32 is a double-stroke double-layer guide rail, and can actually be extended to three or more layers of guide rails according to needs, but if more than three layers are set, its thickness will be thicker.

[0047] The multi-layer slide rail 32 can achieve good sliding smoothness through rollers or bearings, which will not be described in detail here.

[0048] Specifically, Figure 1 , Figure 2 and Figure 5As shown, the sliding assembly 3 includes four positioning sliders 31 and multi-layer slide rails 32. The multi-layer slide rails 32 include four guide rails 321 fixed in parallel on the core 1 and four middle rails 322 that can slide in the guide rails 321. Each middle rail 322 is half-enclosed in the positioning slider 31.

[0049] In one embodiment, the mold includes a mold core 1, two mold side plates 2, a sliding assembly 3, four limiters 4 and four power sources 5. That is, in this embodiment of the present invention, one power source 5 corresponds to one limiter 4, one positioning slider 31, one middle rail 322 and one guide rail 321. The power source 5 pushes or pulls the limiter 4, which can make the limiter 4 close to or away from the positioning slider 31. When the limiter 4 is away from the positioning slider 31, the positioning slider 31 can slide horizontally on the middle rail 322, and the middle rail 322 can slide in the guide rail 321. At this time, the positioning slider 31 can be moved manually to adjust the width of the mold; when the limiter 4 is close to the positioning slider 31, the positioning slider 31 is fixed, and the lateral position of the mold side plate 2 arranged together with the positioning slider 31 is also determined, so that the size of the mold in the width direction can be limited.

[0050] like Figure 6 As shown, the positioning component 311 can be a tooth-shaped protrusion, the tooth-shaped protrusion of the positioning slider 31 is arranged at the lower part of the positioning slider 31, and the tooth-shaped protrusion of the limiting member 4 is arranged at the upper part of the limiting member 4. When the limiting member 4 is close to the positioning slider 31, the tooth-shaped protrusions of the two are engaged with each other, and the positioning slider 31 can be locked at this time so that it cannot move left or right.

[0051] In another embodiment, the positioning component 311 can also be a pair of circular holes and cylinders. A circular hole or a circular cylinder is provided at the bottom of the positioning slider 31, and a circular cylinder or a circular hole is provided at the top of the stopper 4. When the stopper 4 is close to the positioning slider 31, the circular holes and cylinders of the two are meshed with each other, and the positioning slider 31 can be locked so that it cannot move left or right. This embodiment is not shown in the figure.

[0052] In the embodiment of the present invention, the spacing between every two adjacent positioning components 311 is 1-10 mm. The spacing can be 1 mm, or 10 mm, preferably 5 mm, which is convenient for calculation and adjustment, and can quickly obtain accurate calculation results when adjusting the mold width.

[0053] In a preferred embodiment, mutually limiting blocking members are respectively provided on the guide rail 321 and the middle rail 322, and mutually limiting blocking members are also respectively provided on the middle rail 322 and the positioning slider 31. The outward travel of the middle rail 322 along the guide rail 321 does not exceed half of the length of the guide rail 321, and the outward travel of the positioning slider 31 along the middle rail 322 does not exceed half of the length of the middle rail 322. Such a structure can ensure that the multi-layer slide rail 32 still has a certain strength after being pulled out for a certain distance.

[0054] In a preferred embodiment, four long-stroke multi-layer slide rails 32 are installed on the mold core 1. The multi-layer slide rails 32 are double-layer slides. Taking the guide rail 321 with a body length of 150 mm as an example, the outer end faces of the mold side plates 2 on the left and right sides are 15 mm away from the ends of the guide rails 321. When the multi-layer slide rails 32 are fully retracted, the minimum mold surface width is 180 mm. The multi-layer slide rails 32 are stretched to both sides. The stretching can be done by pulling out the positioning slider 31 first, or by pulling out the middle rail 322 first, or both can be pulled out at the same time. Assuming that the maximum sliding stroke of the positioning slider 31 can reach 120 mm, the mold surface width can be adjusted from 180 mm to a maximum width of 420 mm.

[0055] The stopper 4 is connected to a power source 5 that drives it to move up and down. The power source 5 is generally a linearly driven cylinder or electric cylinder, or a motor that cooperates with screws, gears and other components. The setting of the power source 5 is a conventional means that can be easily selected by those skilled in the art according to the specific transmission direction, cost and accuracy, and will not be elaborated here.

[0056] In a preferred embodiment, a power source 5 arranged at the bottom of the mold core 1 is driven horizontally, and is connected to a steering connection pair, which has a transmission connection surface matching the limit member 4, and is used to convert the left and right direction drive of the power source 5 into the up and down movement of the limit member 4.

[0057] In the present invention, the role of the steering connection pair is to give way. Due to the limitations of the contact area between the mold and the bag body, especially the bottom of the mold must extend into the bag body, so there is not enough space at the bottom to set the power source. Therefore, the direction of the power drive is set to the horizontal direction. The steering connection pair converts the drive direction into the up and down movement of the limit member to achieve giving way, so that the mold power source will not touch the bag body and affect the processing progress.

[0058] The steering connection sub-transmission means that convert left and right movement into up and down movement mainly include the following: Gear drive: The direction of movement can be changed by the meshing of gears. For example, a horizontal gear can be meshed with a vertical gear; Chain drive: Chain drive can change the direction of movement through the cooperation of chain and sprocket. By designing a suitable sprocket layout, horizontal motion can be converted into vertical motion; screw drive: screw drive can convert horizontal rotational motion into vertical linear motion; worm drive: the worm and worm wheel in the worm drive can achieve a change in the direction of motion; belt drive: by designing a suitable pulley, belt drive can also achieve a change in the direction of motion and convert horizontal motion into vertical motion; connecting rod mechanism: through the design of the connecting rod mechanism, motion in one direction can be converted into motion in the vertical direction. For example, a crank-connecting rod mechanism can be used to convert horizontal motion into vertical motion; it can also be achieved by setting a crank on the gear; cam mechanism: the cam mechanism can achieve a change in the direction of motion by designing a suitable cam and follower such as a roller or slider; slider-crank mechanism: this mechanism can achieve the conversion from left and right motion to up and down motion by combining a horizontally moving slider with a vertically moving crank; pneumatic or hydraulic transmission directly changes the output direction of the fluid to achieve vertical up and down motion. These transmission methods have their own characteristics and applicable scenarios. In the present invention, the mold core 1 is inserted into the bag to be formed, and the mold side plate 2 is stretched to the side. Therefore, the bottom power source 5 generally does not have space for the vertical drive limiter 4, otherwise it will collide with the bag. In order to arrange the spatial layout more reasonably, a steering connection pair is needed that can convert the horizontal output into the up and down displacement of the limiter 4. The selection of a suitable transmission method requires comprehensive consideration of factors such as the specific load size, accuracy requirements, and spatial layout in this field.

[0059] As one of the implementations in the above example, Figure 6 As shown, the steering connection pair is composed of an oblique guide block 61 and an oblique matching block 62, the oblique guide block 61 is connected to the power source 5, the limit member 4 is connected to the oblique matching block 62 or is integrally formed, the inclined surface of the oblique guide block 61 and the inclined surface of the oblique matching block 62 fit each other, so that the left and right movement of the oblique guide block 61 is converted into the up and down movement of the oblique matching block 62.

[0060] In summary, the present invention proposes a packaging bag forming mold, which has significant technical effects compared with the prior art, including: the present invention adopts a structural design of making a recess on the outer side of the mold side plate, so that the side of the bag body will not fit tightly with the mold, and it is convenient to separate from the mold; due to the mold structure of the present invention, it is convenient to demould even if the bag body is tightly pressed against the mold, and the formed bag body does not need to be tapered on the front or side, and the bag shape can be more neatly processed, ensuring that each side edge connected to the bag body is in a vertical state relative to the bottom surface, and the side connecting part is also straight, which is beneficial to the aesthetics and bearing capacity of the bag body; the structure of the multi-layer slide rail of the present invention can realize the adjustable range of the mold surface width size By extending to both sides close to the length of the multi-layer slide rail body, the adjustment range is greatly increased, thereby increasing the applicability of the mold; the mold structure of the present invention is evenly spaced with positioning components, which can facilitate the staff to adjust the width of the mold according to the specific width of the bag body. Each time, it is only necessary to calculate how many positioning components need to be moved inward or outward. Compared with the traditional motor-driven screw adjustment accuracy that is difficult to ensure, or the earlier bolt fixing method that is cumbersome to operate and difficult to measure, the adjustment scheme of the present invention is very simple to calculate and adjust, because there is no requirement for the precision of the power source, the equipment cost will also be greatly reduced, saving the time used for replacing molds in production and improving efficiency.

[0061] A typical workflow of the present invention is described as follows:

[0062] During operation, the front and rear surfaces of the bag body are turned up to form a U shape at the bottom of the mold, and the front of the bag body is attached to the outer surface of the horizontal support plate 22 on the left and right sides of the mold located on the front side, which is the front lateral support surface 221, and the back of the bag body is respectively attached to the outer surface of the horizontal support plate 22 on the left and right sides of the mold located on the rear side, which is the rear lateral support surface 221, and then the folding tongues on the left and right sides of the bottom of the bag body are turned up and attached to the left and right accommodating parts 214, and the front and rear parts of the bag body that form the side surfaces are folded sideways and the connecting parts are attached to the recessed part 213, and the folded corners formed by the folding are attached to the outside of the straight corners 23 formed by the longitudinal support surfaces and the lateral support surfaces 221, respectively, so as to ensure the stiffness of the corners of the bag body. When the side is connected, since the vertical plane where the lowest point of the recess 213 is located is located on the inner side of the longitudinal support surface, the edge seal molding component on the outer side of the side presses the bag surface onto the mold. Therefore, the part of the bag side that is connected is naturally squeezed toward the recess 213 during the molding process, and moves more inward than the corner part of the bag body. When the edge seal molding component is withdrawn, due to the stiffness of the corner part, the side connection part of the bag body will naturally pop out and separate from the recess 213. After a gap is generated between this part and the mold, the bag body will not fit tightly between the mold, and it is more convenient to separate from the mold.

[0063] The existence of the accommodating portion 214 allows the folded tongue of the bag body to be turned up and covered on the accommodating portion 214, and on the other hand allows the four bottom corners of the bag body to move further inward relative to the four side ribs during molding. After the molding device pressing the bag body on the outside is withdrawn, the bottom corners will also rebound, creating a gap with the mold, which is more conducive to demolding.

[0064] When the width of the mold needs to be adjusted to adapt to the width of the packaging bag to be processed, the spacing between every two adjacent positioning components 311 is fixed, which is convenient for the staff to make manual adjustments. Each time the specifications of the bag body change, the corresponding width can be directly calculated by adjusting the number of positioning components 311. Before adjustment, drive the power source 5 (it can also be automatically disengaged through program control when changing the mold) to disengage the limiter 4 from the matching relationship with the positioning slider 31, unlock the sliding of the positioning slider 31, and then adjust the unit to the set position according to the spacing of the positioning components 311, and then drive the power source 5 to make the limiter 4 lock the positioning slider 31 in this position, so as to complete the adjustment of the mold width.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "a specific embodiment" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. It is understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0066] The preferred embodiments described above are only examples, and those skilled in the art may think of other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0067] The terms used herein are only used for the purpose of describing various embodiments and are not intended to be limiting. As used herein, singular forms are intended to also include plural forms, unless the context clearly indicates an exception. In addition, it will be understood that the terms "including" and / or "having" when used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the embodiments of the present application. In short, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A packaging bag forming mold, characterized in that: The invention comprises a mold core (1), a mold side plate (2), a sliding assembly (3), a stopper (4) and a power source (5); the two mold side plates (2) are respectively arranged on the left and right sides of the mold core (1) in the width direction through the sliding assembly (3); each mold side plate (2) is provided with a recess (213) on the outer side in the width direction; mutually matching positioning components (311) are provided on the sliding assembly (3) and the stopper (4); the power source (5) is arranged on the mold core (1) and can push and pull the stopper (4), so that the stopper (4) and the positioning component (311) on the sliding assembly (3) are moved closer to each other to engage with each other, or moved away from each other to release the engagement.

2. The packaging bag forming mold according to claim 1, characterized in that: The mold side plate (2) comprises a side support plate (21) and a transverse support plate (22); the transverse support plates (22) on the front and rear sides of the side support plate (21) are respectively provided with transverse support surfaces (221) on the outer sides relative to the mold core (1) for contacting the inner surface of the front side or the rear side of the bag body to be processed; the side support plate (21) comprises a front support bag portion (211), a rear support bag portion (212) and a recessed portion (213); the outer side surfaces of the front support bag portion (211) and the rear support bag portion (212) of the same side support plate (21) jointly form a longitudinal support surface.

3. The packaging bag forming mold according to claim 2, characterized in that: The recess (213) extends to the bottom of the mold side plate (2), and the bottom edges of the front support pocket (211) and the rear support pocket (212) have a receiving portion (214) at a distance from the bottom edge of the mold side plate (2).

4. The packaging bag forming mold according to claim 3, characterized in that: The outer surface of the recess (213) is a plane, the vertical plane where the lowest point is located is the same plane as the vertical plane where the highest point is located, and the plane is located on the inner side of the longitudinal support surface; the plane where the recess (213) is located has a height difference of 0.3-2mm with the longitudinal support surface.

5. The packaging bag forming mold according to claim 1, characterized in that: The sliding assembly (3) comprises a plurality of positioning sliders (31) and multi-layer slide rails (32), each of the positioning sliders (31) being slidably disposed on the multi-layer slide rails (32), each of the mold side plates (2) being fixedly connected to at least one of the positioning sliders (31), and each of the positioning sliders (31) being provided with a plurality of positioning components (311) capable of engaging or disengaging with a limiting component (4).

6. The packaging bag forming mold according to claim 5, characterized in that: The multi-layer slide rail (32) comprises a plurality of parallel guide rails (321) and a middle rail (322) slidably arranged inside each guide rail (321); each guide rail (321) is fixed on the mold core (1); and each middle rail (322) is slidably connected to a positioning slide block (31).

7. The packaging bag forming mold according to claim 6, characterized in that: Each of the mold side plates (2) on the left and right sides is connected to at least two positioning slide blocks (31), and the height positions of the two positioning slide blocks (31) are staggered.

8. The packaging bag forming mold according to claim 1, characterized in that: The positioning component (311) is a tooth-shaped protrusion or a circular hole-cylinder pair.

9. The packaging bag forming mold according to claim 8, characterized in that: The distance between every two adjacent tooth-shaped protrusions or circular hole-cylinder pairs is 1-10 mm.

10. The packaging bag forming mold according to any one of claims 1 to 9, characterized in that: The power source (5) arranged at the bottom of the mold core (1) is driven in the horizontal direction and is connected to a steering connection pair. The steering connection pair has a transmission connection surface that matches the limit member (4) and is used to convert the horizontal drive of the power source (5) into the up and down movement of the limit member (4).

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