Highly adaptive die assembly and pulp molding machine

Abstract

In order to solve the problem of uneven mold pressing in the mold closing process, the application provides a height self-adaptive mold closing device, which comprises upper and lower mounting plates arranged between the lower mold and the lower mold base, the upper mounting plate is fixed below the lower mold, the lower mounting plate is fixed above the lower mold base, and a plurality of elastic supporting devices are arranged between the upper and lower mounting plates. A pulp molding machine has the height self-adaptive mold closing device. During mold closing, uneven molds can be polished because the elastic supporting members corresponding to each mold of different heights are compressed to different degrees, which compensates for the height deviation between the molds. The beneficial effects of the new type are that even if there is a height deviation between the molds during mold closing, the height self-adaptive mold closing device can compensate for the deviation, there is no risk of damaging the molds during mold closing, and the molds can be polished every time, improving production efficiency and product quality.

Description

Technical Field

[0001] This invention relates to the field of mold manufacturing, and in particular to a highly adaptive mold-closing device and a pulp molding machine. Background Technology

[0002] Machines with mold-closing functions, such as pulp molding machines, complete all the different processes from blank to finished product within the machine. The existing process is as follows: after mold alignment, the molds are precisely closed in a cold state. Once closed, the molds are heated. After reaching the specified temperature, heating is maintained, and the moving and positioning device of the mobile machine is activated to re-close each mold individually.

[0003] Since its inception, the automatic pulp molding machine has faced two major problems that have not been well resolved: first, the horizontal movement position error of the mold leads to inaccurate mold closing; second, the manufacturing error of the mold height results in uneven product pressing.

[0004] Regarding the issue of inaccurate mold closing, whenever there is a transfer between processes, the mold needs to move, thus raising the issue of mold positioning accuracy. Whether the mold can be accurately aligned after a process transfer is crucial for the normal operation of the machine. Because of manufacturing errors in the mold moving and positioning devices, if the horizontal positioning is inaccurate, pressure cannot be applied (otherwise, it will cause rigid damage to the mold moving and positioning devices, reducing the accuracy of mold alignment). Due to thermal expansion and contraction after heating, the mold position will shift slightly after the heating process. Even if the mold was accurately closed during the cold mold closing process, it is difficult to accurately close it again after the heating process. To avoid affecting subsequent processes, the clamping bolts must be loosened and the mold re-aligned.

[0005] Regarding the issue of uneven pressing, after the mold is closed, pressure is applied to the workpiece. Due to manufacturing errors in the mold or insufficient rigidity and unevenness of the mold mounting surface, there may be height errors after the mold is closed, resulting in unevenness of the product. That is, due to errors in mold manufacturing, the height is uneven (approximately 1-2 mm). This causes the higher mold to receive greater pressure during pressing, while the lower mold receives less pressure. As a result, the lower mold cannot be pressed smooth, and the shape of the product cannot meet the standard requirements. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention aims to provide a height-adaptive mold closing device and a pulp molding machine to solve the problem that lower molds cannot be flattened during mold closing due to slight differences in mold height.

[0007] A height-adaptive mold closing device includes a lower mounting plate and an upper mounting plate disposed between a lower mold and a lower mold base. The upper mounting plate is fixed below the lower mold, and the lower mounting plate is fixed above the lower mold base. A plurality of elastic support devices are disposed between the lower mounting plate and the upper mounting plate.

[0008] Furthermore, the elastic support device is a disc spring.

[0009] Further, the elastic support device includes an upper bushing, a lower bushing, and an elastic support member, wherein: the lower bushing has a first sleeve in the middle, and the lower bushing has a lower mounting portion for connecting the elastic support member on its periphery; the upper bushing has a second sleeve in the middle that can be slidably fitted onto the first sleeve, and the upper bushing has an upper mounting portion for connecting the elastic support member on its periphery; the elastic support member has its two ends connected to the upper mounting portion and the lower mounting portion, respectively.

[0010] Furthermore, the elastic support device also includes a guide spindle and a first locking nut, the guide spindle passing through the first sleeve and connected to the first locking nut.

[0011] Furthermore, the guide spindle is also provided with a second locking nut for pressing the first locking nut.

[0012] Furthermore, a second elastic member is provided between the upper and lower mounting plates, the second elastic member being used to support the upper mounting plate so that it does not abut against the upper bushing.

[0013] Furthermore, a heat insulation layer is provided between the upper mounting plate and the lower mounting plate, and the lower mounting plate and the heat insulation layer are provided with vent pipe mounting holes, and the vent pipe is installed on the vent pipe mounting holes.

[0014] A pulp molding machine having the aforementioned height-adaptive mold clamping device.

[0015] Furthermore, the pulp molding machine includes a connecting rod for connecting the two, the connecting rod having spherical ends at both ends, the upper mounting plate and the lower mounting plate having mounting holes adapted to the shape of the spherical ends, the spherical ends being rotatably mounted in the mounting holes.

[0016] Furthermore, the spherical end does not extend beyond the upper mounting plate or the lower mounting plate.

[0017] During mold closing, each elastic support device is compressed until it reaches a certain level. At this point, the elastic support device provides the upward reaction force required for mold closing, thus completing the mold closing process. During mold closing, even uneven molds can be smoothed out because the elastic support corresponding to each mold of different height is compressed to a different degree, compensating for the height deviation between molds.

[0018] The beneficial effect of this height-adaptive mold closing device is that even if there is a height deviation in the mold during mold closing, the deviation can be compensated by this height-adaptive mold closing device. There is no risk of rigid damage to the mold during mold closing, while ensuring that all molds are smoothed every time the mold is closed, thereby improving production efficiency and product quality. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the height-adaptive mold clamping device of the present invention;

[0020] Figure 2 This is another cross-sectional schematic diagram of the height-adaptive mold clamping device of the present invention;

[0021] Figure 3 This is a schematic diagram of the buffer mechanism of the present invention;

[0022] Figure 4 This is a cross-sectional schematic diagram of the buffer mechanism of the present invention;

[0023] Figure 5 A schematic diagram of a pulp molding machine equipped with the height adaptive clamping device of the present invention;

[0024] Figure 6 This is a cross-sectional schematic diagram of a pulp molding machine equipped with the height adaptive clamping device of the present invention.

[0025] In the diagram: 1. Locating pin; 2. Lower mounting plate; 3. Ball head bolt assembly; 4. Screw; 5. Heat insulation layer; 6. Vent pipe; 7. Height-adaptive mold closing device; 8. Upper mounting plate; 11. Guide spindle; 12. Lower bushing; 13. Disc spring; 14. Upper bushing; 15. First locking nut; 16. Second locking nut; 21. Upper heat insulation plate; 22. Upper heating plate; 23. Upper mold; 24. Upper guide cone; 25. Lower guide cone sleeve; 26. Lower mold; 27. Lower heating plate; 28. Lower heat insulation plate; 29. ​​Height-adaptive mold closing device; 30. Lower mold base. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] like Figure 1-6 As shown, a height-adaptive mold clamping device 7 includes a lower mounting plate and an upper mounting plate disposed between a lower mold 26 and a lower mold base 30. The upper mounting plate 8 is fixed below the lower mold 26, and the lower mounting plate 2 is fixed above the lower mold base 30. Several elastic support devices are disposed between the lower mounting plate and the upper mounting plate.

[0028] It should be noted that those skilled in the art can easily conceive of placing the upper and lower mounting plates between the upper mold and the upper mold base, so this solution also belongs to the technical solution of the present invention.

[0029] During mold closing, each elastic support device is compressed until it reaches a certain level. At this point, the elastic support device provides the upward reaction force required for mold closing, thus completing the mold closing process. During mold closing, even uneven molds can be smoothed out because the elastic support corresponding to each mold of different height is compressed to a different degree, compensating for the height deviation between molds.

[0030] Furthermore, the elastic support device is a disc spring 13. More specifically, the elastic support device consists of several sets of disc springs 13 connected in series or in parallel, with two disc springs forming a group, and the large radius ends of each group of disc springs abutting each other.

[0031] Further, the elastic support device includes an upper bushing 14, a lower bushing 12, and an elastic support member, wherein: the lower bushing 12 has a first sleeve in the middle, and the lower bushing 12 has a lower mounting portion for connecting the elastic support member on its periphery; the upper bushing 14 has a second sleeve in the middle that can be slidably fitted onto the first sleeve, and the upper bushing 14 has an upper mounting portion for connecting the elastic support member on its periphery; the elastic support member has its two ends connected to the upper mounting portion and the lower mounting portion, respectively.

[0032] Furthermore, the elastic support device also includes a guide spindle 11 and a first locking nut 15, wherein the guide spindle 11 passes through the first sleeve and is connected to the first locking nut 15.

[0033] Furthermore, the guide spindle 11 is also provided with a second locking nut 16 for pressing the first locking nut 15.

[0034] like Figure 4As shown, several height-adaptive mold-closing devices 7 are set up corresponding to the lower mold 26. The lower bushing 12 can be fixedly installed on the lower mold base 30 of the machine, and the lower mold 26 is connected to the upper bushing 14 through the upper mounting plate 8. When the lower mold 26 is compressed during mold closing, the lower mold 26 pushes the first clamping nut downward, causing the entire guide spindle 11 and the upper bushing 14 to slide downward along the lower bushing 12. At this time, the elastic support is compressed. Until the first clamping nut abuts against the first sleeve, or the elastic support reaches the limit position and can no longer be pressed down, the height-adaptive mold-closing device 7 can provide an upward reaction force to complete the mold closing. During mold closing, molds with uneven heights can be smoothed because the elastic support corresponding to each mold of different height is compressed to a different degree. The spring compensates for the height deviation of the mold by compression.

[0035] Furthermore, the guide mandrel 11 comprises a screw 4 and a first locking nut 15, the first locking nut 15 having a stepped portion for abutting the end of the second sleeve, and the head of the screw 4 for abutting the upper bushing 14. The detachable first locking nut 15 can be easily mounted on the screw 4 to form the guide mandrel 11.

[0036] Furthermore, the height-adaptive mold clamping device 7 also includes an upper mounting plate 8, a lower mounting plate 2, and a second elastic member for connecting the two. The lower bushing 12 is fixed to the lower mounting plate 2, and the second elastic member is used to support the upper mounting plate 8 so that it does not abut against the upper bushing 14.

[0037] like Figure 2 , Figure 6As shown, due to the slight difference in height between the molds, the highest mold contacts first during mold closing. As the pressure increases, the first set of disc springs 13 corresponding to the highest mold is compressed. As the pressure continues to rise, the second highest mold contacts, and the springs of the second set of molds corresponding to the second highest mold are also compressed. As the pressure further increases, all molds contact, and all disc springs are compressed. When the pressure reaches the rated pressure, all springs are compressed to a certain height (due to the different heights of the molds, the corresponding disc springs are compressed to different degrees), so all molds receive a certain pressure, and all products are smoothed. The pressure is then removed, completing one work cycle. From the above working process, it can be seen that after the disc springs 13 are pre-tightened, there is still a distance between the top of the limiting end of the guide spindle 11 and the upper mounting plate 8. In the initial stage of mold closing, the disc springs 13 are not under force, and the top of the limiting end approaches the upper mounting plate 8; when the limiting end abuts against the upper mounting plate 8, the molds of different heights begin to apply pressure to the disc springs 13. At this point, the springs are compressed to varying lengths, resulting in varying pressures on the mold. It is these varying pressures, all exceeding the preload of the disc springs, that enable the device to achieve height self-adaptation. Because this pressure is greater than or equal to the minimum calendering pressure of the product, the machine completes the calendering process using the minimum total pressure.

[0038] Furthermore, a heat insulation layer 5 is provided between the upper mounting plate 8 and the lower mounting plate 2. The lower mounting plate 2 and the heat insulation layer 5 are provided with vent pipe mounting holes. The vent pipe 6 is installed in the vent pipe mounting holes, passing through both the upper mounting plate 8 and the lower mounting plate 2. To prevent interference between the vent pipe 6 and the upper mounting plate 8, a gap is left between the vent pipe 6 and the mounting holes of the upper mounting plate. Therefore, the vent pipe 6 is installed on the lower mounting plate and passes through both the upper and lower mounting plates.

[0039] A pulp molding machine having the aforementioned height-adaptive mold clamping device 7.

[0040] Furthermore, the pulp molding machine includes a connecting rod for connecting the two, with spherical ends at both ends of the connecting rod. The upper mounting plate 8 and the lower mounting plate 2 are provided with mounting holes adapted to the shape of the spherical ends, and the spherical ends are rotatably installed in the mounting holes. At least one of the upper mounting plate 8 and the lower mounting plate 2 is provided with a plurality of height-adaptive mold closing devices 7, the height of which is not greater than that of the connecting rod. A third elastic element is also provided between the upper mounting plate 8 and the lower mounting plate 2 for making the upper mounting plate 8 and the lower mounting plate 2 respectively abut against the spherical ends.

[0041] This technical solution is proposed to solve the misalignment problem mentioned in the background art, which is also the secondary objective of this invention. The principle of this technical solution is as follows: The lower mounting plate 2 is mounted on the lower mold base 30 of the machine, and the lower mold 26 of the machine is mounted on the upper mounting plate 8. Due to the elastic force of the third elastic element, the upper and lower mounting plates 2 abut against the spherical ends of the connecting rod, and the spherical surface of the spherical end is in contact with the wall of the mounting hole of a suitable shape, so that the spherical end can roll along the mounting hole within a small angle. During mold closing, if the mold position moves slightly after heating, a horizontal resultant force will be generated during the engagement of the upper guide cone 24 and the lower guide cone sleeve 25, causing the upper and lower mounting plates 2 to have a tendency to have a horizontal relative displacement. This causes the spherical end to roll within the mounting hole due to this force. At this time, the connecting rod deflects at an angle as the spherical end rolls, thereby giving the upper and lower mounting plates 2 a horizontal relative displacement to compensate for the slight displacement of the mold position. It should be noted that the third elastic element can be a spring, an elastic pillar, etc. Combining the height-adaptive mold clamping device 7 given above, a height-level adaptive mold clamping device 29 can be obtained.

[0042] It should be noted that the connecting rod can be a ball head bolt device 3, which includes a ball head screw 4 and a ball head nut. To avoid interference, a gap is left between the second locking nut 16 and the ball head screw 4 and the side wall of the mounting hole.

[0043] Furthermore, the spherical end does not extend beyond the upper and lower mounting plates 2. For example, the lower mounting plate 2 is provided with several height-adaptive mold-closing devices 7, the height of which is less than that of the connecting rod. The height from the top of the height-adaptive mold-closing device 7 to the bottom of the upper mounting plate 8 is not greater than the height from the top of the spherical end to the top of the upper mounting plate 8. To allow sufficient space for the mold-closing action, an appropriate distance is maintained between the upper mounting plate and the height-adaptive mold-closing device. Otherwise, the upper mounting plate may be unable to move horizontally due to the frictional force of the height-adaptive mold-closing device. The ball head bolt head cannot protrude from the mounting plate, and the second locking nut cannot protrude from the upper mounting plate; otherwise, it will bend the spherical end, affecting the smoothness of the mold-closing action and causing impact damage to the machine structure.

[0044] Furthermore, the pulp molding machine also includes a lower mold base 30 and a lower mold 26. The lower mounting plate 2 is fixed to the lower mold base 30 with screws 4, and the lower mold 26 is fixed to the upper mounting plate 8 by a positioning pin 1 provided on the upper mounting plate 8.

[0045] It should be noted that the upper heat insulation plate 21, upper heating plate 22, upper mold 23, lower heating plate 27, and lower heat insulation plate 28 are common structures in mold closing machines, and are shown in the figure for easy understanding.

[0046] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A height-adaptive mold clamping device, characterized in that: It includes a lower mounting plate and an upper mounting plate disposed between the lower mold and the lower mold base. The upper mounting plate is fixed below the lower mold, and the lower mounting plate is fixed above the lower mold base. Several elastic support devices are disposed between the lower mounting plate and the upper mounting plate. The elastic support device is a disc spring; The elastic support device includes an upper bushing, a lower bushing, and an elastic support member, wherein: The lower bushing has a first sleeve in the middle, and the lower bushing has a lower mounting part on its periphery for connecting the elastic support member; The upper bushing has a second bushing in the middle that can be slidably fitted onto the first bushing, and the upper bushing has an upper mounting part on its periphery for connecting the elastic support member. The elastic support member is connected at both ends to the upper mounting part and the lower mounting part, respectively; It also includes a guide mandrel and a first locking nut, the guide mandrel passing through the first sleeve and connected to the first locking nut; The guide spindle is also provided with a second locking nut for pressing the first locking nut; A second elastic element is provided between the upper and lower mounting plates, the second elastic element being used to support the upper mounting plate so that it does not abut against the upper bushing.

2. The height-adaptive mold clamping device as described in claim 1, characterized in that: A heat insulation layer is provided between the upper mounting plate and the lower mounting plate. The lower mounting plate and the heat insulation layer are provided with vent pipe mounting holes, and the vent pipe is installed on the vent pipe mounting holes.

3. A pulp molding machine, characterized in that: It has a height-adaptive mold closing device as described in any one of claims 1-2.

4. A pulp molding machine as described in claim 3, characterized in that: The pulp molding machine includes a connecting rod for connecting the two, the connecting rod having spherical ends at both ends, the upper mounting plate and the lower mounting plate having mounting holes adapted to the shape of the spherical ends, and the spherical ends being rotatably mounted in the mounting holes.

5. A pulp molding machine as described in claim 4, characterized in that: The spherical end does not extend beyond the upper mounting plate or the lower mounting plate.

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