CN213808839U - Protection device for be used for stereoplasm PMI foam parts machining process - Google Patents

Abstract

The utility model discloses a protective device used in the machining process of hard PMI foam parts, which relates to the technical field of hard PMI foam part production and machining and comprises a supporting plate, a soft protective film and a vacuum air exhaust component, wherein the soft protective film is covered on the surface of the supporting plate and forms a storage space with the supporting plate; the flexible protective film is provided with a fixed end and a movable end, the supporting plate is provided with a first end and a second end, the fixed end of the flexible protective film is detachably connected with the first end of the supporting plate, and the movable end of the flexible protective film can be movably connected with the second end of the supporting plate; the air exhaust end of the vacuum air exhaust assembly is communicated with the storage space. The utility model discloses can store the space for stereoplasm PMI foam part provides, can not only make soft protection film adaptation part surface and provide certain flexible protection through the extraction vacuum, the simple operation nature is higher, and the leakproofness is good moreover, can antifouling moisture-proof.

Description

Protection device for be used for stereoplasm PMI foam parts machining process

Technical Field

The utility model relates to a stereoplasm PMI foam parts production and processing technology field particularly, relates to a protector that is used for stereoplasm PMI foam parts machining process.

Background

PMI rigid foam (polymethacrylimide) is a closed-cell rigid foam material, has excellent mechanical property and electrical property, but is brittle when being machined and has hygroscopicity because the material has a pore structure and weak intermolecular binding force. At present, in the processes of waiting, transferring, storing and the like among the processes of machining operation of hard PMI foam parts, a fish-bubble bag, kraft paper, a PVC film plastic bag and the like are generally adopted for sealing and packaging, a buffer material or a soft material needs to be placed on a sharp edge to prevent the sharp edge from being bruised and pressed, and the outside is packaged by a carton. The protection means is relatively troublesome, the operation convenience is low, certain moisture absorption conditions still exist in parts, and the production efficiency and the performance of the parts are influenced to a certain extent.

In view of this, the present application is specifically made.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a protector for stereoplasm PMI foam parts machining process, the device can store the space for stereoplasm PMI foam part provides, can not only make soft protection film adaptation part surface and provide certain flexible protection through the extraction vacuum, and the simple operation nature is higher, and the leakproofness is good moreover, can antifouling moisture-proof.

The embodiment of the utility model is realized like this: a protective device used in the machining process of hard PMI foam parts comprises a supporting plate, a soft protective film and a vacuum pumping assembly, wherein the soft protective film is covered on the surface of the supporting plate, and a storage space is formed between the soft protective film and the supporting plate; the flexible protective film is provided with a fixed end and a movable end, the supporting plate is provided with a first end and a second end, the fixed end of the flexible protective film is detachably connected with the first end of the supporting plate, the movable end of the flexible protective film can be movably connected with the second end of the supporting plate, and when the movable end of the flexible protective film is connected with the second end of the supporting plate, a storage space formed between the whole flexible protective film and the supporting plate is in a sealed state; the air exhaust end of the vacuum air exhaust assembly is communicated with the storage space.

The rotating frame assembly comprises a first rotating frame, the first rotating frame is fixedly connected with the movable end of the soft protective film, and the first rotating frame is hinged with the supporting plate and can rotate along the direction between the first end and the second end of the supporting plate; the movable end of the soft protective film can be connected with the second end of the supporting plate by rotating the first rotating frame.

Furthermore, the rotating frame assembly also comprises a second rotating frame, the second rotating frame is fixedly connected with the fixed end of the soft protective film, and the second rotating frame is hinged with the supporting plate and can rotate along the direction between the first end and the second end of the supporting plate; the second rotating frame is rotated, so that the fixed end of the soft protective film can be connected with the first end of the supporting plate.

Furthermore, the position of the second rotating frame hinged with the supporting plate is the same as the position of the first rotating frame hinged with the supporting plate.

Furthermore, a flange is formed at the edge of the surface of the supporting plate close to the soft protective film, the shape of the first rotating frame is matched with that of the flange at the second end, and the first rotating frame and the flange at the second end can be clamped with each other to form sealing.

Further, the shape of the second rotating frame is matched with the shape of the flange at the first end, and the second rotating frame and the flange part at the first end can be mutually clamped and form a seal.

Further, the first end and the second end of layer board all are the cuboid form, and the flange part of first end department and second end department is the U type form, the lateral wall of the flange part of second end department all is provided with the sand grip, the card slot has all been seted up to the sand grip of all sides near the side that stores the space, the card slot of all sides communicates each other and forms the form that wholly is U type groove, first swivel mount includes the U type frame with U type groove shape adaptation, U type frame and soft protection film fixed connection, and two tip of U type frame all are articulated with layer board or flange, and can rotate along the direction between layer board first end and the second end, when U type frame rotates towards second end one side, can the joint in U type inslot.

Furthermore, the side wall of the U-shaped frame and the U-shaped groove which are mutually clamped and connected and/or the groove wall of the U-shaped groove and the U-shaped frame which are mutually clamped and connected are provided with sealing gaskets.

Furthermore, the middle part of the U-shaped frame is provided with a pull buckle.

Further, the vacuum pumping assembly comprises a vacuum pump and a pumping pipeline, one end of the pumping pipeline is connected with the vacuum pump, and the other end of the pumping pipeline is connected with the flange and can be communicated with the storage space.

The embodiment of the utility model provides a beneficial effect is:

the embodiment of the utility model provides a protector operates through the expansion end to soft protection film, can with form between the layer board and seal to can provide the space that stores that can be encapsulated situation for stereoplasm PMI foam part, can not only make soft protection film adaptation part surface through the extraction vacuum, adapt to the shape on part surface, and can provide certain flexible protection, whole leakproofness is good moreover, can reach better antifouling damp proof effect.

Generally, the embodiment of the utility model provides a protection device accessible is convenient operation relatively provides sealed storage space to stereoplasm PMI foam part, and then reaches flexible protection and antifouling damp-proofing purpose.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a protection device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram ii of a protection device according to an embodiment of the present invention;

fig. 3 is a schematic partial structural view of the second end according to an embodiment of the present invention.

Icon: 1-a vacuum pumping assembly; 2-soft protective film; 3-a supporting plate; 4-a rotating assembly; 11-a vacuum pump; 12-an air extraction pipeline; 21-a movable end; 22-a fixed end; 31-a second end; 32-a first end; 33-a rib; 34-convex strips; 35-a card slot; 41-a first rotating frame; 42-a second rotating frame; 43-point of articulation; and 44-pulling the button.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "first", "second", "third", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

Referring to fig. 1 to fig. 3, the protection device for the rigid PMI foam component processing process according to the embodiment includes a supporting plate 3, a flexible protective film 2 and a vacuum pumping assembly 1, where the supporting plate 3 is used to provide a platform for supporting the rigid PMI foam component, and the flexible protective film 2 is used to provide shielding and flexible protection for the rigid PMI foam component, specifically, the flexible protective film 2 is covered on the surface of the supporting plate 3, where the covering is that the flexible protective film 2 is covered on the supporting surface of the supporting plate 3, and may be in a form of direct contact between the two or in a form of indirect contact between the two. A storage space is formed between the soft protective film 2 and the supporting plate 3 and is used for stably storing the hard PMI foam parts.

Through above design, can realize promptly providing the stable purpose that stores platform or space for stereoplasm PMI foam part, and the end of bleeding of vacuum subassembly 1 communicates with each other with storing the space, can communicate with any one of 3 bearing surfaces of layer board or soft protection film 2 promptly, can store the space and carry out the vacuum extraction in good time, thereby make the attached in stereoplasm PMI foam part surface of soft protection film 2 pressurized and better, not only can adapt to the various shapes of stereoplasm PMI foam part and reach the purpose of laminating, and can place the stability of storing in the space for stereoplasm PMI foam part and provide the assurance, thereby reach the effect that flexible protection and stable placing.

The better sealed effect of this storage space is further guaranteed, the antifouling damp proof purpose can also be reached promptly. Specifically, soft protection film 2 has stiff end 22 and expansion end 21, layer board 3 has first end 32 and second end 31, and the stiff end 22 of soft protection film 2 can be dismantled with the first end 32 of layer board 3 and be connected, can dismantle the mode of connecting and can be one of spiro union, grafting, joint or lock joint etc. of course, these some can dismantle the mode of connecting and can be stiff end 22 and first end 32 direct contact and reach the purpose of dismantling the connection, also can reach the purpose of dismantling the connection through the middleware contact. The movable end 21 of the flexible protective film 2 can be movably connected with the second end 31 of the supporting plate 3, the movable connection can be one of movable fastening, movable clamping, movable embedding or movable locking, and the like, and similarly, the movable connection mode can be that the movable end 21 and the second end 31 are in direct contact to achieve the purpose of detachable connection, and can also achieve the purpose of detachable connection through the contact of an intermediate piece.

The fixed end 22 and the first end 32 form a normally closed port with respect to the entire storage space, except that in special cases the fixed end 22 and the first end 32 are detached from each other, while the movable end 21 and the second end 31 form a normally open port, mainly for providing access for the placement of rigid PMI foam parts. When the movable end 21 of the flexible protective film 2 is connected to the second end 31 of the supporting plate 3, the storage space formed between the flexible protective film 2 and the supporting plate 3 is in a sealed state, that is, the fixed end 22 and the first end 32 are sealed and connected to each other, meanwhile, the movable end 21 and the second end 31 are sealed and connected to other places except the two places, so that the purpose that the whole storage space is in a sealed state is achieved, and only the movable end 21 and the second end 31 serve as a single movable opening in the state. It should be noted that the sealing connection may be in a fixed sealing state, or may be achieved by tight fitting between parts or by adding a sealing element such as a sealing ring or a sealant.

In order to facilitate the operation of the movable end 21 of the flexible protective film 2, so as to achieve the purpose of connecting the movable end 21 and the second end 31, the protection device provided in this embodiment further includes a rotating frame assembly 4, the rotating frame assembly 4 includes a first rotating frame 41, and the first rotating frame 41 is mainly in a frame shape formed by winding or combining stainless steel wires. The first rotating frame 41 is fixedly connected with the movable end 21 of the flexible protective film 2, the fixed connection mode can be bonding, welding or fastening through a fastener, and the like, and the purposes that the movable end 21 and the first rotating frame 41 are mutually fixed and the sealing performance of the connection position is good can be achieved. The first rotating frame 41 is hinged to the supporting plate 3 and can rotate along the direction between the first end 32 and the second end 31 of the supporting plate 3, here, the first end 32 and the second end 31 are mainly used as the main end of the supporting plate 3, although the supporting plate 3 may have other ends, but the other ends can achieve the purpose of fixed sealing by adopting a mode equivalent to the interconnection between the fixed end 22 and the first end 32, here, the first end 32 and the second end 31 are mainly taken as an example for description, it is only required that the first rotating frame 41 rotates back and forth on the path between the first end 32 and the second end 31, and the first rotating frame 41 is rotated to a certain angle, so that the purpose of sealing connection between the movable end 21 and the second end 31 can be achieved. In principle, the position where the first rotating frame 41 is hinged to the supporting plate 3 may be any position on the supporting plate 3, such as the position of the first end 32, the joint of the first end 32 and the second end 31 or the position of the second end 31, or the position of the edge side or the middle of the supporting plate 3, which can achieve the purpose of driving the movable end 21 to connect with the second end 31.

Similarly, the rotating frame assembly 4 further includes a second rotating frame 42, the second rotating frame 42 is fixedly connected to the fixed end 22 of the flexible protective film 2, the fixed connection manner can be bonding, welding or fastening by a fastener, etc., and only the purpose of fixing the fixed end 22 and the second rotating frame 42 to each other and having a good sealing property at the connection position can be achieved. The second rotating frame 42 is hinged to the supporting plate 3 and can rotate along the direction between the first end 32 and the second end 31 of the supporting plate 3, the mode of the hinged arrangement refers to the hinged mode between the first rotating frame 41 and the supporting plate 3, and the fixed end 22 of the flexible protective film 2 can be connected with the first end 32 of the supporting plate 3 by rotating the second rotating frame 42, and the connection is in a detachable connection but in a normally closed state. Similarly, the hinge position between the second rotating frame 42 and the pallet 3 may be located at any position on the pallet 3 in principle, but in order to avoid interference between the first rotating frame 41 and the second rotating frame 42 and to reduce the influence between the motions, the hinge position between the second rotating frame 42 and the pallet 3 is the same as the hinge position between the first rotating frame 41 and the pallet 3, that is, the hinge point 43 between the first rotating frame 41 and the second rotating frame 42 is the same. In another embodiment, the hinge point 43 between the first rotating frame 41 and the second rotating frame 42 is different and is located on the supporting plate 3 near the corresponding first end 32 or second end 31. In both ways, the purpose of less mutual action interference between the first rotating frame 41 and the second rotating frame 42 can be achieved. Of course, the closer the hinge point 43 is to the first end 32, especially to the first end 32, the more the whole flexible protection film 2 is similar to the form of single opening, and when the hinge point 43 is to the middle of the first end 32 and the second end 31, the whole flexible protection film 2 is similar to the form of double opening.

Returning to the embodiment, the sealing manner between the movable end 21 and the second end 31 and between the fixed end 22 and the first end 32 can be achieved by the first rotating frame 41 and the second rotating frame 42, at this time, the first rotating frame 41 and the second rotating frame 42 are used as intermediate members for sealing, specifically, the edge of the supporting plate 3 near the surface of the flexible protective film 2 is formed with the rib 33, and the whole supporting plate 3 can be made of an anti-rust aluminum plate, and the rib 33 is formed by bending. The shape of the first rotating frame 41 is adapted to the shape of the rib 33 at the second end 31, and can be mutually clamped and sealed with the portion of the rib 33 at the second end 31, that is, the rib 33 formed at the second end 31 is the portion of the whole rib 33, and the first rotating frame 41 needs to be adapted to the shape of the portion of the rib 33. The shape or at least partial shape of the first rotating frame 41 can be similar to the shape of the flange 33 of the part, the first rotating frame 41 is rotated, the first rotating frame and the second rotating frame can achieve the purpose of mutual internal and external clamping or internal and external sleeving, the internal and external clamping or sleeving mode has high sealing performance, and the sealing can be achieved through tight fit, such as interference, transition or clearance fit modes between hole shafts, or through adding a sealing ring or adding a sealing glue. Likewise, the second rotating frame 42 is shaped to fit the rib 33 at the first end 32 and to engage and form a seal with the rib 33 at that location. This achieves the purpose of achieving the sealing connection between the movable end 21 and the second end 31 and between the fixed end 22 and the first end 32 by using the first rotating frame 41 and the second rotating frame 42 as intermediate members.

In the present embodiment, the first end 32 and the second end 31 of the supporting plate 3 are both rectangular parallelepiped, that is, at least the supporting plate 3 has two rectangular parallelepiped end portions, but the shape of the entire supporting plate 3 is not limited, and the connecting portion therebetween may have other shapes, and likewise, may have end portions with other shapes. For convenience of understanding, the supporting plate 3 is only provided with the first end 32 and the second end 31 in a rectangular parallelepiped shape, that is, the whole supporting plate 3 is in a rectangular plate form. Specifically, the rib 33 portions at the first end 32 and the second end 31 are U-shaped, that is, a rectangle is U-shaped cut along a central line, except that the corners of the U-shape are 90 degrees, and the rib 33 portion at the second end 31 is taken as an example for explanation, the outer side wall of the rib 33 portion at the second end 31 is provided with a convex strip 34, that is, three side walls of the rib 33 portion at the second end 31 are provided with convex strips 34, the convex strips 34 at the three sides are preferably connected end to end, and the convex strips at each side are arranged along the length direction of the side wall of the rib 33.

The protruding strip 34 of all sides is close to the side of storing the space and is gone up the side and all seted up the draw-in groove 35 promptly, and the draw-in groove 35 of all sides communicates each other and forms the form that wholly is U type groove, shows promptly that second end 31 department flange 33 is partial, and the protruding strip 34 is seted up the draw-in groove 35 of becoming the U type on the whole wholly, and this U type is similar with the flange 33 shape of this department, can supply first swivel mount 41 to carry out the activity joint. Specifically, the first rotating frame 41 includes a U-shaped frame adapted to the shape of the U-shaped groove, that is, the first rotating frame 41 has at least a portion that is the U-shaped frame, but of course, the first rotating frame 41 may be entirely in the form of the U-shaped frame. The U-shaped frame portion of the first rotating frame 41 is fixedly connected with the flexible protective film 2, the fixed connection mode is the same as the connection mode of the flexible protective film 2 and the first rotating frame 41, and both end portions of the U-shaped frame are hinged to the supporting plate 3 or the flange 33, and can rotate along the direction between the first end 32 and the second end 31, and when the U-shaped frame rotates towards one side of the second end 31, the U-shaped frame can be clamped in the U-shaped groove, so that the purpose that the first rotating frame 41 serves as an intermediate piece to achieve specific sealing connection between the movable end 21 and the second end 31 is achieved. Of course, the form and connection relationship between the second rotating frame 42 and the supporting plate 3 are the same as those between the first rotating frame 41 and the supporting plate 3, and thus the description thereof is omitted.

In order to further increase the sealing effect between U type frame and the U type groove to improve the leakproofness between expansion end 21 and the second end 31 and between stiff end 22 and the first end 32, the lateral wall of the mutual joint in U type frame and U type groove and/or the cell wall of the mutual joint in U type groove and U type frame are provided with sealed the pad, show promptly that no matter in U type frame or U type groove arbitrary or both set up sealed the pad jointly, all can reach better sealed effect. The sealing gasket can be adhered or embedded on the outer wall of the U-shaped frame and the groove wall of the U-shaped groove, and certainly, for high stability of the sealing gasket connection, the sealing gasket is arranged on the iron wire body of the U-shaped frame in a coating mode and is arranged on the groove wall of the U-shaped groove in a bonding mode. The pull buckle 44 is arranged in the middle of the U-shaped frame, and the pull buckle 44 is also formed by winding an iron wire, and is preferably welded to the U-shaped frame, so that a certain force application point can be given to an operator, and the corresponding first rotating frame 41 or second rotating frame 42 can be opened or closed conveniently.

The protector that this embodiment provided can store stereoplasm PMI foam part, through the extraction vacuum back, the various shape states of adaptable part in addition, and it is convenient to use, and the structure is ingenious and cost-controllable, and the life-span is longer and can reuse. Especially, the vacuum pumping mode can greatly improve the convenience of the whole device and the protection stability of the soft protective film 2. In this embodiment, the vacuum pumping assembly 1 includes a vacuum pump 11 and a pumping pipeline 12, one end of the pumping pipeline 12 is connected to the negative pressure pumping end of the vacuum pump 11, and the other end is connected to the rib 33 and can be communicated with the storage space. Wherein, the size of vacuum pump 11, model isoparametric design according to the small-size goods shelves product of present market corresponds the parameter design of standard, fully considers installation stability and maneuverability, and secondly, this vacuum pump 11 and bleed-off line 12 adopt the design of the quick change dismouting interface of standard to the interface, satisfy the requirement of quick uninstallation switching. After the extraction vacuum, soft protection film 2 can be attached on blank, semi-manufactured goods or part rapidly, and its material chooses for use the rubber material that compliance is better, the ageing resistance is good for repeated contraction can reach better flexible protection mesh, is assisted again with the connection stability and the leakproofness of first swivel mount 41 or second swivel mount 42, can reach better antifouling damp-proof effect, avoids the influence of external environment such as humidity, greasy dirt.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that structures or components illustrated in the drawings are not necessarily drawn to scale, and descriptions of well-known components and processing techniques and technologies are omitted to avoid unnecessarily limiting the invention.

Claims (10)

1. A protection device used in the machining process of hard PMI foam parts is characterized by comprising a supporting plate, a soft protective film and a vacuum pumping assembly, wherein the soft protective film is covered on the surface of the supporting plate, and a storage space is formed between the soft protective film and the supporting plate; the flexible protective film is provided with a fixed end and a movable end, the supporting plate is provided with a first end and a second end, the fixed end of the flexible protective film is detachably connected with the first end of the supporting plate, the movable end of the flexible protective film can be movably connected with the second end of the supporting plate, and when the movable end of the flexible protective film is connected with the second end of the supporting plate, a storage space formed between the whole flexible protective film and the supporting plate is in a sealed state; and the air exhaust end of the vacuum air exhaust assembly is communicated with the storage space.

2. The shielding apparatus for rigid PMI foam parts processing of claim 1, further comprising a turret assembly, said turret assembly comprising a first turret fixedly connected to said flexible protective film at a free end thereof, said first turret being hinged to said pallet and rotatable in a direction between said pallet first and second ends; and the movable end of the flexible protective film can be connected with the second end of the supporting plate by rotating the first rotating frame.

3. The shield apparatus for rigid PMI foam part processing according to claim 2, wherein said turret assembly further comprises a second turret, said second turret being fixedly connected to a fixed end of said flexible protective film, and said second turret being hinged to said pallet and being rotatable in a direction between said first and second ends of said pallet; and the second rotating frame is rotated, so that the fixed end of the soft protective film can be connected with the first end of the supporting plate.

4. The shield for rigid PMI foam parts processing of claim 3, wherein said second swivel frame is hinged to said pallet at the same location as said first swivel frame is hinged to said pallet.

5. The protection device for rigid PMI foam part processing according to claim 2 or 3, wherein the edge of the supporting plate near the surface of the flexible protective film is formed with a rib, and the shape of the first rotating frame is adapted to the shape of the rib at the second end and can be mutually clamped and sealed with the rib part at the second end.

6. The shield for rigid PMI foam parts processing of claim 3, wherein said second turret has a shape that is adapted to the shape of said rim at said first end and is capable of interlocking with and forming a seal with said rim portion at said first end.

7. The shield apparatus according to claim 5, wherein the first end and the second end of the supporting plate are rectangular, the rib portions at the first end and the second end are U-shaped, the outer sidewall of the rib portion at the second end is provided with a protruding strip, the side surfaces of the protruding strips at all sides near the storage space are provided with a slot, the slots at all sides are communicated with each other and form a U-shaped slot, the first rotating frame comprises a U-shaped frame adapted to the U-shaped slot, the U-shaped frame is fixedly connected to the flexible protective film, and both ends of the U-shaped frame are hinged to the supporting plate or the rib and can rotate in the direction between the first end and the second end of the supporting plate, when the U-shaped frame rotates towards the second end, can the joint be in U type inslot.

8. The shield device for the rigid PMI foam part processing according to claim 7, wherein a sealing gasket is disposed on a side wall of the U-shaped frame and the U-shaped groove which are mutually clamped and/or a groove wall of the U-shaped groove and the U-shaped frame which are mutually clamped and connected.

9. The shield for rigid PMI foam parts processing of claim 7, wherein a pull tab is provided in the middle of said U-shaped frame.

10. The shielding apparatus for rigid PMI foam parts processing of claim 5, wherein said vacuum pumping assembly comprises a vacuum pump and a pumping duct, said pumping duct having one end connected to said vacuum pump and another end connected to said rib and capable of communicating with said storage space.

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