CN219806453U - Thermoforming device - Google Patents

Abstract

The utility model discloses a thermoforming device, which relates to the thermoforming field, and comprises a forming chamber and a negative pressure device communicated with the forming chamber, wherein the forming chamber is provided with a negative pressure deformation part, a mould is arranged on the deformation path of the negative pressure deformation part, and one side of the mould facing the negative pressure deformation part is used for bearing a plate to be formed; according to the utility model, the mold and the plate are arranged in the forming chamber, the forming chamber is connected with the negative pressure device, so that the plate can be tightly attached to the mold under the action of negative pressure, and further is formed smoothly, and the negative pressure deformation part is arranged in the forming chamber, and the plate and the mold are sequentially arranged on the deformation path of the negative pressure deformation part, so that the negative pressure deformation part can fix the plate under the action of the negative pressure device, the size of the plate is not limited by a fixing frame of the plastic plate in the prior art, and the plate with the corresponding size can be cut and prepared according to the different molds.

Description

Thermoforming device

Technical Field

The utility model relates to the field of thermoforming, in particular to a thermoforming device.

Background

The clamping mechanism in the patent document CN211710019U comprises an upper frame body and a lower frame body, wherein one sides of the upper frame body and the lower frame body are mutually hinged, and a locking assembly is arranged between the upper frame body and the lower frame body; when the upper frame body and the lower frame body are mutually closed, the upper frame body and the lower frame body are locked through the locking assembly, so that the plastic sheet is clamped and fixed between the upper frame body and the lower frame body; however, it should be noted that, regardless of the size of the blister piece to be manufactured, the plastic sheet can only be sized to match the upper and lower frames: if the plastic sheet with the size smaller than that of the upper frame body and the lower frame body can be clamped, the plastic sheet cannot be fixed by the clamping mechanism, and the plastic sheet can deviate in the plastic sucking molding process and cannot be tightly attached to the die, so that the plastic sucking piece is failed to prepare, and the limitation of the size of the plastic sheet causes great waste when the small plastic sucking piece is prepared.

The plastic sheet fixing device in the patent document CN211074679U comprises an upper frame body and a lower frame body, wherein the left sides of the upper frame body and the lower frame body are mutually hinged, concave parts are distributed on the upper surface of the lower frame body, convex parts corresponding to the concave parts are distributed on the lower surface of the upper frame body, an upper vertical plate and a lower vertical plate are respectively arranged on the right sides of the upper frame body and the lower frame body, a spring pin is fixed on the upper vertical plate, and insertion holes are formed in the lower vertical plate; after the plastic sheet is placed on the lower frame body, the upper frame body is buckled downwards, a spring pin is inserted into the insertion hole, and the plastic sheet is clamped and fixed through the frame edges of the upper and lower frame bodies, the protruding parts and the recessed parts; however, the plastic sheet must be matched with the upper and lower frames to be clamped by the frame edges of the upper and lower frames, so that the plastic sheet cannot be completely used when the smaller-sized product is prepared, and the plastic sheet is wasted.

The applicant, after careful study of the above documents, found that: the plastic sucking device adopting the plastic sheet fixing device is limited by the sheet fixing device, and the sheet matched with the sheet fixing device in size can be adopted no matter the size of the die/workpiece, and when the sheet with smaller size is prepared, the sheet can be wasted greatly, so that the technical problem to be solved is urgent by the person skilled in the art is solved on the basis of ensuring the smooth molding of the sheet.

Disclosure of Invention

The utility model aims to provide a thermoforming device which solves the problems in the prior art, so that the device reduces the loss of a plate on the basis of ensuring smooth forming of the plate.

In order to achieve the above object, the present utility model provides the following solutions:

the utility model provides a thermal forming device which comprises a forming chamber and a negative pressure device communicated with the forming chamber, wherein the forming chamber is provided with a negative pressure deformation part, a mould is arranged on a deformation path of the negative pressure deformation part, and one side, facing the negative pressure deformation part, of the mould is used for bearing a plate to be formed.

Preferably, a bearing part is further arranged on the deformation path of the negative pressure deformation part, the bearing part is located at one side of the die, which is away from the negative pressure deformation part, and one side of the bearing part, which is towards the negative pressure deformation part, is used for bearing the die.

Preferably, the bearing part is uniformly provided with a plurality of exhaust ports connected with the negative pressure device.

Preferably, the vent grooves are uniformly formed in the die, and the aperture of the vent groove at the corner of the die is larger than that of the vent groove at the plane of the die.

Preferably, the vent grooves are curved.

Preferably, a supporting piece is placed between the bearing part and the die and used for supporting the die.

Preferably, exhaust passages corresponding to the exhaust grooves are formed between two adjacent rows of the supporting pieces.

Preferably, the support is a sandbag or a metal block.

Preferably, the number of the supporting pieces is plural, and the supporting pieces are uniformly arranged between the bearing part and the die.

Preferably, the thermoforming device further comprises a heat gun for correcting the non-bonded part of the plate to be formed and the die.

Compared with the prior art, the utility model has the following technical effects:

1. the utility model adopts the forming chamber with the negative pressure deformation part, the mould is arranged on the deformation path of the negative pressure deformation part, one side of the mould facing the negative pressure deformation part is used for bearing the plate to be formed, and the forming chamber is connected with the negative pressure device, so that the plate to be formed can be tightly attached to the mould under the action of the negative pressure device to obtain a product which is matched with the mould, the plate to be formed is fixed through the negative pressure deformation part, the plate to be formed is not limited by a plate fixing frame in the prior art, and the plate with corresponding size can be cut out in advance according to different products, thereby avoiding the plate loss caused by the adoption of a large-size plate by the small-size mould, that is, the device reduces the plate loss on the basis of ensuring the smooth forming of the plate.

2. According to the utility model, a mode of uniformly arranging a plurality of sand bags between the bearing part and the mould is adopted, on one hand, the sand bags have fluidity, so that the shape of the sand bags can be changed according to different types of moulds, the moulds can be stably supported, and the problems that the manufactured products are inconsistent with the moulds and line protrusions appear at the corners of the products due to unstable or skewed mould support are avoided; on the other hand, the height of the die can be changed by increasing or decreasing the quantity of the sand bags, so that the die always keeps the optimal height: the distance between the plate to be formed and the negative pressure deformation part carried on the die is within the deformation range of the negative pressure deformation part, so that the negative pressure deformation part can play a role in fixing the plate to be formed in the deformation process, meanwhile, the sand bag also fills the region of the forming chamber, which needs to be vacuumized, the air quantity needed to be extracted is reduced, and the power loss of the negative pressure device is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural view of a forming chamber without a support;

FIG. 2 is a schematic view of the structure of a sheet material to be formed after being placed in a forming chamber filled with a support member;

FIG. 3 is a schematic view of a structure in which a plate to be formed is tightly adhered to a mold;

FIG. 4 is a top view of the forming chamber with the support member being a sandbag;

FIG. 5 is a schematic view of the structure of the negative pressure deformable portion as a frame with an elastic material embedded therein;

FIG. 6 is a schematic view of a heating device;

wherein, 1, a forming chamber; 2. a negative pressure device; 3. a negative pressure deformation part; 4. a mold; 5. a plate to be formed; 6. a carrying part; 7. an exhaust port; 8. an exhaust groove; 9. a support; 10. an exhaust passage; 11. a heating device.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

As shown in fig. 1-3, the thermoforming device comprises a forming chamber 1 and a heating device 10, a die 4 for bearing a plate 5 to be formed is placed in the forming chamber 1, and the forming chamber 1 is connected with a negative pressure device 2; during operation, an operator firstly heats the plate in the heating device 11 to a softened state, then wears protective gloves or uses clamping tools such as a mechanical arm to transfer the plate in the softened state into the forming chamber 1, places the plate on the die 4, then starts the negative pressure device 2 to discharge air in the forming chamber 1, enables the forming chamber 1 to form a negative pressure environment, closely adheres the plate 5 to the die 4 under the negative pressure, forms the plate after the plate is cooled, takes the plate out of the forming chamber 1, and obtains a required product after the plate is subjected to post-treatment.

It should be noted that, in the prior art, the plate 5 to be formed is mostly fixed by the plate fixing frame, but the size of the plate fixing frame is fixed, which means that even when a product with a size far smaller than that of the plate fixing frame is prepared, the plate 5 to be formed with a size matching with that of the plate fixing frame needs to be selected, which is far larger than that of the product (otherwise, the plate cannot be fixed, and the plate deviates from the die 4 in the forming process, so that the obtained product does not conform to the die 4), and this causes great waste of the plate.

In order to solve the problem that the plate is wasted because the plate is far larger than the product when the product with smaller size is prepared because the size of the plate fixing frame is fixed, the forming chamber 1 in the utility model is provided with a negative pressure deformation part which can deform under the action of the negative pressure device 2, the die 4 is positioned on the deformation path of the negative pressure deformation part, and one side of the die 4, which is close to the negative pressure deformation part, is used for bearing the plate 5 to be formed; during operation, the negative pressure deformation part moves towards the opposite side of the negative pressure deformation part under the action of the negative pressure device 2, and then the plate 5 to be formed is fixed, at this time, the plate and the die 4 for bearing the plate are located on the deformation path of the negative pressure deformation part, so that the negative pressure deformation part can fix the plate in the deformation process no matter the size of the plate, and therefore, the plate can be cut in advance according to the size of the product to be prepared no matter the size of the product to be prepared, and the loss of the plate is greatly reduced.

It should be noted that, the heating device 11 in the present utility model may be various devices, such as an oven, a heating furnace, a heating plate, a microwave heating chamber, a ceramic tile-shaped infrared heater, etc., as long as it can heat the hardened sheet material to a softened state, and since the heat conductivity coefficient and the heat conductivity coefficient of the sheet material 5 to be formed decrease with the increase of the thickness of the sheet material, when heating a thinner sheet material, one-sided heating is only required; when the thicker plate is heated, double-sided heating, preheating or high-frequency heating can be adopted to shorten the heating time; the plate 5 to be formed can be made of PVC, PE, PLA, PP, PS, PET, PETG, APTT, ABS, HIPS, but is not limited to the above materials, and can be made of a material which meets the conditions of plasticity under a certain temperature condition, solidification after cooling and repetition of the process; the mold 4 can be a gypsum mold, a felling mold, a bakelite mold, an aluminum mold, a copper mold, a hardware mold and the like, which depend on the types of products to be prepared, wherein the aluminum mold has better consistency of a cavity due to CNC processing, and can obtain ideal surface finish after polishing or spraying teflon on the surface, so that the products have better effect when being demolded, and can be selected when the quality requirements of the products are higher.

And, the panel need complete cooling just can smooth shaping after closely laminating in mould 4, if take out before the product does not cool down completely, because the product has not hardened completely yet, in taking out the in-process, the product will receive external force and external temperature's influence, leads to self size and shape to change, reduces the product shaping effect. The cooling mode can adopt water cooling or air cooling, water mist or cold air is sprayed above the product to cool the product, and if a better cooling effect is required, the die 4 with the built-in cooling coil can be selected.

Meanwhile, the formed product is shaped and kept in vacuum through the die 4 after being cooled, so that the size of the formed plate cannot be changed greatly.

After the sheet is formed, a number of post-treatment processes are required to be performed on the resulting product. For example, surface strengthening: grinding by a bench worker or a machine to remove hidden danger of processing, and carrying out dulling and R-conversion on edges, acute angles and orifices of the product; meanwhile, because uneven plasticizing or uneven cooling of the plate can lead to unavoidable internal stress in the manufactured product, and the internal stress can lead to deformation or cracking of the product in the use process, the product also needs to be annealed.

The post-treatment process of the product also comprises the steps of trimming, welding, bonding, heat sealing, coating, metal spraying, flocking, printing and the like, and the process is selectively carried out according to the requirements of the product.

In the present embodiment, the negative pressure deformation portion is made of high temperature resistant silicone rubber, but is not limited to silicone rubber, and the negative pressure deformation portion may be made of an elastic material such as a phosphor copper alloy, a beryllium copper alloy, a manganese steel, or a stainless steel. And the deformation range of the negative pressure deformation part is larger than the distance between the negative pressure deformation part and the plate.

Further, the negative pressure device 2 comprises a vacuum pump, a gas storage tank, a valve, a pipeline and a vacuum meter. Wherein the vacuum degree of the vacuum pump is more than 0.07-0.09 MPa (520 mmHg), and the capacity of the air storage tank is more than half of the capacity of the molding chamber 1. The concrete type of the vacuum pump can be a water ring type vacuum pump, a reciprocating type vacuum pump or a rotary vane type vacuum pump, and the vacuum pump needs to pay attention to floating dust and particulate matters interference in the forming process, so that the vacuum degree and the pump efficiency of the vacuum pump are prevented from being damaged by the factors, and further the product quality is influenced, and therefore, a storage tank and a filtering device (not shown in the figure) are arranged at the joint of the forming chamber 1 and a pipeline of the negative pressure device 2, so that the floating dust and the particulate matters are filtered, the vacuum pump oil is prevented from becoming turbid or white, and the normal work of the vacuum pump is ensured.

Meanwhile, in the forming process, a sealing space is formed between the heated plate and the die 4, in order to ensure that the plate is tightly adhered to the die 4, air in the sealing space is required to be exhausted, in order to achieve the effect, the die 4 is provided with enough exhaust grooves 8, the aperture of the exhaust grooves 8 positioned at the corners of the die 4 is larger than that of the exhaust grooves 8 positioned at the planes of the die 4, the plate 5 to be formed positioned at the corners of the die 4 can be tightly adhered to the die 4, the problem that the plate is unevenly formed due to the fact that air bubbles exist at the corners of the plate 5 to be formed and the die 4, the thickness of the plate 5 to be formed at the corners of the die 4 is larger than that of the plates at the rest positions of the die 4 is solved, meanwhile, the exhaust grooves 8 are in a curve shape, and particularly, when the negative pressure device 2 draws air in the forming chamber 1 through the exhaust grooves 7, the linear motion can be converted into rotary motion, the suction force of the negative pressure device 2 is increased, and the plastic suction forming is completed more quickly, and the plastic suction efficiency of the device is improved.

After the exhaust groove 8 is arranged, air in the forming chamber 1 can be rapidly removed through the negative pressure device 2, so that sufficient vacuum quantity is ensured in the forming chamber 1 in the forming process, the plate 5 to be formed heated to a softened state can be completely attached to the surface of the die 4 due to sufficient vacuum suction, the forming effect is ensured, meanwhile, the exhaust groove 8 is arranged to ensure the smoothness of exhaust, the vacuum degree in the forming chamber 1 is reduced due to the blockage of foreign matters, and the plastic suction forming is not in place.

Further, the forming chamber 1 is provided with a carrying part 6 opposite to the negative pressure deformation part, and a plurality of supporting pieces 9 are arranged between the carrying part 6 and the die 4. On the one hand, the supporting piece 9 can play a role in filling the forming chamber 1, so that the vacuumizing area of the negative pressure device 2 is reduced, the air quantity required to be extracted is reduced, and the power loss of the negative pressure device 2 is further reduced; on the other hand, the supporting piece 9 can play a good supporting role on the die 4, especially on the die 4 with a special shape on the side far away from the negative pressure deformation part. And when encountering the mould 4 of different sizes, the mode of increasing and decreasing the number of the supporting pieces 9 can realize the adjustment of the height of the mould 4, so that the height of the mould 4 keeps the optimal position: the distance between the plate 5 to be formed on the die 4 and the negative pressure deformation part is within the deformation range of the negative pressure deformation part, so that the negative pressure deformation part can be ensured to smoothly fix the plate.

In addition, according to different conditions, different numbers of supporting pieces 9 can be placed between the bearing part 6 and the die 4 to support the die 4, when the number of the supporting pieces 9 is one, the supporting pieces 9 can provide stable support for one side of the die 4 away from the negative pressure deformation part, and because only one supporting piece 9 is arranged, when the supporting pieces 9 are damaged, the replacement is more convenient; when the number of the supporting pieces 9 is plural, the supporting pieces 9 are uniformly placed between the bearing part 6 and the die 4, and the inner area of the forming chamber 1 can be further reduced, the amount of extracted air can be reduced, and the power loss of the negative pressure device 2 can be further reduced.

The support 9 of the utility model can be is a metal block or a sand bag. When the support 9 is a metal block, the operator can provide a support point for the side of the mold 4 away from the negative pressure deformation portion by placing the metal block, and in particular, can provide a stable support for the mold 4 having a protrusion or protrusions with different heights on the side away from the negative pressure deformation portion.

And an exhaust passage 10 is formed between two adjacent rows of supporting pieces 9, and the exhaust passage 10 corresponds to the exhaust port 7 and the exhaust groove 8, so that the air can be smoothly discharged when the negative pressure device 2 discharges the air in the forming chamber 1, thereby further improving the plastic sucking forming efficiency.

When support piece 9 is the sand bag, because the sand bag has fluidity, can change the shape of sand bag to mould 4 of different grade type, and need not increase and decrease sand bag quantity, it is more convenient to make the support of mould 4, this still prevents simultaneously that mould 4 from taking place to rock because of supporting unstable, lead to the subsides that panel can not be better on the profile surface of mould 4, make the final product not according with the actually required product, still avoided because of mould 4 supports crookedly, lead to the mould 4 highly different towards negative pressure deformation portion one side, the line arch appears in the product corner that makes finally obtain, influence the problem of product outward appearance.

In the present embodiment, as shown in fig. 5, the negative pressure deforming portion 3 is a frame in which the elastic material is embedded, but the frame may be removed to directly fix the elastic material to one surface of the molding chamber 1; when the bearing surface of the bearing part 6 is a plane, the die 4 with the plane bottom surface can be used for bearing, and when the bearing surface of the bearing part 6 is a concave surface, the die 4 with the concave surface can be used for bearing.

In addition, the thermoforming device further comprises a heat gun, and when a part with an unsound joint exists between the plate 5 to be formed and the die 4, an operator can correct the part of the unsound joint through the heat gun so as to ensure a good forming effect.

The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present utility model; also, it is within the scope of the present utility model to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.

Claims (10)

1. A thermoforming apparatus, characterized in that: the forming device comprises a forming chamber and a negative pressure device communicated with the forming chamber, wherein the forming chamber is provided with a negative pressure deformation part, a die is arranged on a deformation path of the negative pressure deformation part, and one side, facing the negative pressure deformation part, of the die is used for bearing a plate to be formed.

2. A thermoforming apparatus as claimed in claim 1, wherein: the negative pressure deformation part is characterized in that a bearing part is further arranged on a deformation path of the negative pressure deformation part, the bearing part is positioned at one side of the die, which is away from the negative pressure deformation part, and one side of the bearing part, which faces the negative pressure deformation part, is used for bearing the die.

3. A thermoforming apparatus as claimed in claim 2, wherein: and a plurality of exhaust ports connected with the negative pressure device are uniformly arranged on the bearing part.

4. A thermoforming apparatus as claimed in claim 2, wherein: and the mold is uniformly provided with vent grooves, and the aperture of the vent grooves at the corners of the mold is larger than that of the vent grooves at the plane of the mold.

5. A thermoforming apparatus as claimed in claim 4, wherein: the exhaust groove is curved.

6. A thermoforming apparatus as claimed in claim 4, wherein: and a supporting piece is arranged between the bearing part and the die and used for supporting the die.

7. A thermoforming apparatus as claimed in claim 6, wherein: and exhaust channels corresponding to the exhaust grooves are formed between two adjacent rows of the supporting pieces.

8. A thermoforming apparatus as claimed in claim 6, wherein: the support is a sand bag or a metal block.

9. A thermoforming apparatus as claimed in claim 6, wherein: the number of the supporting pieces is multiple, and the supporting pieces are uniformly arranged between the bearing part and the die.

10. A thermoforming apparatus as claimed in claim 1, wherein: the thermoforming device further comprises a hot air gun for correcting the part, which is not attached to the die, of the plate to be formed.