Mold closing device of non-woven fabric three-dimensional bag making machine
By introducing an edge-heating mechanism and a buffer component into the nonwoven fabric three-dimensional bag making machine, and using a servo motor to control the static pressure welding of the heat-heating mold and the bag mold, problems such as unstable welding pressure and high noise are solved, welding accuracy and equipment adaptability are improved, and maintenance costs are reduced.
Patent Information
- Application Number
- CN202610761689.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-29
- Publication Date
- 2026-06-30
AI Technical Summary
The existing nonwoven fabric three-dimensional bag making machine has unstable welding pressure, low precision, and high noise during high-speed production, and the equipment cost is high, which cannot meet the requirements of modern production.
The hot-edge heating mechanism includes a moving seat, a drive box, a transmission arm, and a controller. Through eccentric drive and buffer components, it achieves static pressure-holding welding between the hot-edge mold and the bag mold. Combined with precise control by a servo motor, it ensures stable welding pressure and reduced noise.
It achieves constant welding pressure, high precision, and noise elimination, reduces equipment costs, and improves the consistency of welding quality and the comfort of the production environment.
Smart Images
Figure CN122299998A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of nonwoven bag making equipment technology, and in particular to a mold closing device for a nonwoven three-dimensional bag making machine. Background Technology
[0002] Non-woven stand-up pouches are widely used in the packaging industry due to their environmental friendliness and reusability. In the production process of non-woven stand-up pouches, the welding and forming of the bag body is one of the key processes, and the performance of the mold-closing device directly affects the welding quality and production efficiency. Currently, the film-closing structure used in non-woven stand-up pouch making machines on the market generally adopts a continuous full-circle rotation operation. Its working principle is as follows: when the heat-sealing mold approaches the bag mold, it enters a slow-speed running stage. During this stage, the heat-sealing mold does not stop and continues to move at a low speed, contacting the bag mold. Ultrasonic waves are used to weld the non-woven fabric material in the middle into shape. After the heat-sealing mold slowly detaches from the bag mold and forms a certain gap, the bag mold is lifted upwards to avoid tooth pulling problems at the welding point.
[0003] However, the aforementioned traditional lamination structure has many technical defects in actual high-speed production: 1. Unstable welding pressure, requiring high equipment performance. The heat-pressing mold is always in motion during slow operation, without a static pressure holding stage, resulting in continuous dynamic changes in welding pressure. To ensure welding effect, high-power ultrasonic equipment is required, and the material and structural strength requirements of the ultrasonic heat-pressing mold are extremely high, significantly increasing equipment costs and wear; 2. The mold is prone to swaying, affecting welding accuracy. The heat-pressing mold continuously impacts the bag mold at low speed, making it impossible to achieve precise static bonding. Long-term operation will cause an imbalance of forces on the left and right sides of the bag mold, resulting in left and right swaying, directly reducing the welding accuracy of the non-woven fabric material and affecting the quality stability of the finished three-dimensional bag; 3. High operating noise, deteriorating the production environment. The continuous low-speed impact between the heat-pressing mold and the bag mold will generate significant impact noise, especially during high-speed bag making operations, where the noise problem becomes more serious, failing to meet the low-noise and environmentally friendly operation requirements of modern production workshops. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a mold closing device for a nonwoven fabric three-dimensional bag making machine that features stable welding pressure, high welding precision, elimination of impact noise, and strong adaptability.
[0005] The technical solution adopted by this invention to solve its technical problem is: a mold closing device for a non-woven fabric three-dimensional bag making machine, characterized in that: it includes a bag mold and an edge-sealing mechanism disposed on one side of the bag mold; the edge-sealing mechanism includes a movable seat, a drive box, a transmission arm, and a controller; the movable seat is reciprocatingly sliding, and the mold is disposed on the movable seat; the drive box is disposed on the rear side of the movable seat, and a drive element and an output wheel are disposed inside the drive box; the output wheel is drively connected to the drive element; one end of the transmission arm is rotatably connected to the movable seat, and the other end of the transmission arm is eccentrically connected to the output wheel; the controller is connected to the drive element. An electrical connection is provided to control the drive element to decelerate when the moving seat approaches the bag mold, and to control the drive element to stop when the output wheel rotates to a preset angle, so that the hot stamping mold and the bag mold are pressed together and enter a static pressure holding welding state; the hot stamping mold includes at least two sets of wave heads, each set of wave heads is independently configured with a set of buffer components; the buffer components include a buffer member, a second guide component, and a buffer base plate, the buffer base plate is slidably connected to the moving seat through the second guide component, the buffer member is disposed on the moving seat and connected to the buffer base plate, and the wave head passes through the buffer base plate and extends its rear end into the moving seat.
[0006] Preferably, the bag mold is raised and lowered by a vertical drive component.
[0007] Preferably, the ironing mechanism consists of two sets, which are symmetrically arranged on both sides of the bag mold.
[0008] Preferably, the movable seat is configured to slide back and forth via a first guide component.
[0009] Preferably, the driving element is a servo motor.
[0010] Preferably, the buffer is a cylinder.
[0011] Preferably, the buffer is a spring seat and a compression spring disposed within the spring seat.
[0012] The beneficial effects of this invention are: 1. The output wheel and transmission arm eccentrically drive the moving seat to reciprocate, and the controller stops the machine precisely at a preset angle, so that the hot stamping mold is in a completely static pressure-holding state at the moment of welding, and the welding pressure remains constant. The welding pressure can be precisely adjusted by changing the preset stopping angle, which is suitable for non-woven fabrics of different thicknesses and materials. At the same time, the hot stamping mold does not need to bear continuous dynamic impact, which greatly extends the service life of the ultrasonic wave head and reduces maintenance costs. 2. When the heat transfer mold and the bag mold are bonded together, they are in a completely static state, and the force is even on both sides. This eliminates the mold swaying problem caused by dynamic impact in traditional structures from the root, ensuring accurate welding position and uniform weld marks. The heat transfer mold adopts a bonding method that decelerates to a standstill, and there is no rigid impact between it and the bag mold, which completely solves the impact noise problem and improves the workshop production environment. 3. Each group of wave heads is independently equipped with a buffer component. During the heat pressing process, the wave head with greater pressure will automatically retract through the buffer component, so that its pressure is consistent with that of the wave head with less pressure. This effectively solves the problem of uneven pressure of each wave head when heat pressing a large area and ensures the consistency of welding quality. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the mold closing state structure according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the hot-stamping mechanism of the present invention.
[0014] In the diagram: 1. Bag mold; 2. Ironing edge mechanism; 3. Moving seat; 4. Ironing mold; 5. Drive box; 6. Drive element; 7. Output wheel; 8. Transmission arm; 9. Vertical drive component; 10. First guide assembly; 11. Buffer component; 12. Second guide assembly; 13. Buffer base plate; 14. Wave head. Detailed Implementation
[0015] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. Example
[0016] like Figures 1 to 3 The diagram illustrates a mold-closing device for a nonwoven stand-up pouch making machine, comprising a mold 1 and an edge-sealing mechanism 2. The mold 1 holds the semi-finished nonwoven stand-up pouch to be welded, and its shape matches the outline of the stand-up pouch. The mold 1 is raised and lowered via a vertical drive component 9; the vertical drive component 9 can be a pneumatic cylinder, hydraulic cylinder, electric cylinder, or synchronous belt, used to lower the mold 1 to the working height before welding and to raise it after welding to remove the finished product, facilitating connection with other bag-making processes.
[0017] The edge-sealing mechanism 2 consists of two sets, symmetrically arranged on both sides of the bag mold 1. Each set of edge-sealing mechanism 2 includes a movable seat 3, a drive box 5, and a transmission arm 8, and is controlled by the same or synchronously operating controller (not shown in the figure). The two sets of edge-sealing mechanisms 2 operate synchronously, welding the non-woven fabric three-dimensional bag from both sides simultaneously, which can significantly improve welding efficiency and ensure uniform force on both sides of the bag body, further avoiding mold swaying problems.
[0018] A heat-sealing mold 4 is fixedly mounted on the movable seat 3. The heat-sealing mold 4 is used for ultrasonic welding of non-woven fabric materials. The movable seat 3 is slidably positioned for reciprocating movement. In a preferred embodiment, the movable seat 3 achieves reciprocating movement through a first guide assembly 10 to ensure the linearity and stability of the movable seat 3's movement trajectory. Specifically, the first guide assembly 10 can be a combination of a linear guide rail and a slider, wherein the linear guide rail is fixedly mounted on the bag-making machine frame, and the slider is fixedly connected to the movable seat 3; alternatively, the first guide assembly 10 can be a combination of a guide post and a guide sleeve. This structure ensures that the movable seat 3 maintains a linear movement trajectory under the drive of the transmission arm 8, avoiding swaying.
[0019] The heat press mold 4 includes at least two sets of wave heads 14, each set of wave heads 14 being independently equipped with a buffer assembly. The buffer assembly includes a buffer element 11, a second guide assembly 12, and a buffer base plate 13. The buffer base plate 13 is slidably connected to the movable seat 3 via the second guide assembly 12. The second guide assembly 12 uses a guide post and a linear bearing to ensure that the buffer base plate 13 moves only along the heat pressing direction without swaying. The buffer element 11 is disposed on the movable seat 3 and connected to the buffer base plate 13. The wave heads 14 pass through the buffer base plate 13 and extend their rear ends into the movable seat 3. The rear ends of the wave heads 14 are connected to an ultrasonic transducer. The buffer element 11 is a cylinder, with compressed air at a preset pressure introduced into the rod-side or rodless side chamber of the cylinder to provide initial buffering force. Alternatively, the buffer element 11 can be a combination of a compression spring and a spring seat, with one end of the compression spring abutting against the movable seat 3 and the other end abutting against the buffer base plate 13, similarly providing a retractable buffering force for the wave heads 14.
[0020] When the moving seat 3 drives the heat-pressing mold 4 towards the bag mold 1 and presses it, each wave head 14 comes into contact with the non-woven fabric material. Due to slight differences in the surface or material thickness of the bag mold 1, different wave heads 14 experience different reaction forces. For wave heads 14 subjected to greater pressure, they will retract backward relative to the buffer base plate 13, causing the buffer base plate 13 to compress the piston rod of the buffer member 11, thus reducing the actual pressing pressure of that wave head 14; for wave heads 14 subjected to less pressure, the buffer base plate 13 compensates forward under the action of the buffer member 11, increasing the pressure of that wave head 14. Ultimately, the pressure of all wave heads 14 tends to be consistent, achieving balanced heat pressing.
[0021] The drive box 5 is located on the rear side of the movable base 3 (i.e., the side away from the bag mold 1). The drive box 5 houses the drive element 6 and the output wheel 7, which are connected to the drive element 6 via a transmission mechanism. In this embodiment, the drive element 6 is a servo motor to provide precise angle control and speed adjustment. The servo motor and the output wheel 7 can be directly connected or driven by a reducer. The rotor position feedback signal of the servo motor is connected to a controller (not shown in the figure) to achieve closed-loop precise control of the rotation angle of the output wheel 7, ensuring that the stopping accuracy of the preset angle is within ±0.5°, thereby ensuring the stability and repeatability of the welding pressure.
[0022] One end of the transmission arm 8 is rotatably connected to the movable seat 3 (e.g., hinged via a pin), and the other end of the transmission arm 8 is eccentrically connected to the output wheel 7 (i.e., the connection point is offset from the rotation center of the output wheel 7). When the output wheel 7 rotates, it drives the movable seat 3 to reciprocate in a straight line via the transmission arm 8.
[0023] In this embodiment, the initial position is set at the position where the heat-pressing mold 4 is furthest from the bag mold 1. At this position, the rotation angle of the output wheel 7 from this initial position is defined as 0°. As the output wheel 7 continues to rotate, the transmission arm 8 drives the moving seat 3 to move towards the bag mold 1.
[0024] The controller (not shown in the diagram) is electrically connected to the drive element 6. The controller includes a control program and an interactive interface. The control program implements logic control functions, while the interactive interface allows operators to set parameters and display equipment status. The controller uses a PLC or microcontroller, internally storing preset parameters for the rotation angle of the output wheel 7 and the duration for which the heat-pressing mold 4 maintains pressure during welding. The controller controls the drive element 6 to decelerate as the moving seat 3 approaches the bag mold 1, ensuring the moving seat 3 moves smoothly at low speed and avoiding high-speed impacts. When the output wheel 7 rotates to the preset angle (e.g., 175°), the controller immediately stops the drive element 6. At this point, the heat-pressing mold 4 and the bag mold 1 press together and enter a static pressure-holding welding state, and the ultrasonic wave head activates to complete the precise welding of the non-woven fabric material. After welding, the controller reverses the drive element 6, and the output wheel 7 drives the moving seat 3 to reset, preparing for the next mold-closing operation.
[0025] In this embodiment, the specific values of the preset angle and holding time are set by the operator on the interactive interface according to parameters such as the thickness, density, and number of waves of the nonwoven fabric material to meet the time requirements of different welding processes. When it is necessary to increase the welding pressure, the preset angle can be finely adjusted to a larger value (e.g., 177°). At this time, the stopping position of the output wheel 7 is closer to the 180° limit position, and the bonding pressure between the heat mold 4 and the bag mold 1 increases accordingly, thereby adapting to nonwoven fabric materials of different thicknesses and materials. The specific value of the preset angle is set by the operator on the touch screen according to parameters such as the thickness, density, and melting point of the nonwoven fabric material. The control program converts the angle and holding time settings on the interactive interface into the number of pulses or rotation commands of the servo motor to achieve one-click pressure adjustment. The holding time can be set according to the characteristics of the welding material, with a typical range of 0.2 seconds to 1.5 seconds. After the control program delays for the set time, it automatically controls the drive element 6 to reverse, driving the moving seat 3 to reset, completing one complete mold closing welding cycle.
[0026] Initially, the output wheel 7 is at 0°, and the heat-pressing mold 4 and the bag mold 1 are at their maximum distance. After the welding program is started, the controller (not shown in the figure) sends a forward rotation command to the drive element 6 (servo motor), and the drive element 6 drives the output wheel 7 to rotate from 0°. The output wheel 7 drives the moving seat 3 to move towards the bag mold 1 along the first guide assembly 10 through the eccentrically connected transmission arm 8. When the moving seat 3 approaches the bag mold 1, the controller (not shown in the figure) automatically controls the drive element 6 to decelerate, so that the moving seat 3 moves smoothly at a low speed. When the output wheel 7 rotates to a preset angle (e.g., 175°), the controller (not shown in the figure) controls the drive element 6 to stop immediately. At this time, the heat-pressing mold 4 and the bag mold 1 are tightly pressed together, and each wave head 14 is in contact with the non-woven fabric material. The buffer assembly automatically adjusts the pressure difference between each wave head, so that the pressing pressure of all waves head 14 tends to be consistent. The controller (not shown in the figure) starts timing according to the set pressure holding time (e.g., 0.5 seconds), and at the same time, the ultrasonic wave head works to complete the static pressure holding welding of the non-woven fabric material. After the holding pressure time is reached, the controller (not shown in the figure) controls the drive element 6 to reverse, driving the output wheel 7 to rotate in the opposite direction. This, through the transmission arm 8, pulls the moving seat 3 back to its initial position, completing one mold closing and welding operation. When it is necessary to change to a different material or thickness of non-woven fabric, the operator can directly change the holding pressure time or preset angle value (e.g., from 175° to 177°) through the controller's (not shown in the figure) interactive interface to change the bonding pressure between the heat exchanger 4 and the bag mold 1 without any mechanical adjustment.
Claims
1. A mold-closing device for a nonwoven fabric three-dimensional bag making machine, characterized in that: The device includes a bag mold (1) and an ironing mechanism (2) disposed on one side of the bag mold (1). The ironing mechanism (2) includes a movable seat (3), a drive box (5), a transmission arm (8), and a controller. The movable seat (3) is reciprocating and sliding. An ironing mold (4) is disposed on the movable seat (3). The drive box (5) is disposed on the rear side of the movable seat (3). The drive box (5) contains a drive element (6) and an output wheel (7). The output wheel (7) is connected to the drive element (6) in a transmission manner. One end of the transmission arm (8) is rotatably connected to the movable seat (3). The other end of the transmission arm (8) is eccentrically connected to the output wheel (7). The controller is electrically connected to the drive element (6) and is used to control the drive element (6) to move on the movable seat (3). When approaching the bag mold (1), the speed is reduced, and when the output wheel (7) rotates to a preset angle, the drive element (6) is controlled to stop, so that the hot stamping mold (4) and the bag mold (1) are pressed together and enter a static pressure holding welding state; the hot stamping mold (4) includes at least two sets of wave heads (14), each set of wave heads (14) is independently configured with a set of buffer components; the buffer components include a buffer element (11), a second guide component (12), and a buffer base plate (13). The buffer base plate (13) is slidably connected to the moving seat (3) through the second guide component (12). The buffer element (11) is set on the moving seat (3) and connected to the buffer base plate (13). The wave head (14) passes through the buffer base plate (13) and its rear end extends into the moving seat (3).
2. The mold closing device of the nonwoven fabric three-dimensional bag making machine according to claim 1, characterized in that: The bag mold (1) is raised and lowered by a vertical drive component (9).
3. The mold closing device of the nonwoven fabric three-dimensional bag making machine according to claim 1, characterized in that: The ironing mechanism (2) consists of two sets, which are symmetrically arranged on both sides of the bag mold (1).
4. The mold closing device of the nonwoven fabric three-dimensional bag making machine according to claim 1, characterized in that: The movable seat (3) is set to slide back and forth via the first guide component (10).
5. The mold closing device of the nonwoven fabric three-dimensional bag making machine according to claim 1, characterized in that: The driving element (6) is a servo motor.
6. The mold closing device of the nonwoven fabric three-dimensional bag making machine according to claim 1, characterized in that: The buffer (11) is a cylinder.
7. The mold closing device of the nonwoven fabric three-dimensional bag making machine according to claim 1, characterized in that: The buffer (11) is a spring seat and a compression spring disposed in the spring seat.