Bonding device for processing oxygen mask

Abstract

The invention discloses a bonding device for oxygen therapy mask processing, and relates to the technical field of oxygen therapy mask processing, the bonding device comprises a base, the upper side of the base is fixedly connected with a bearing frame, the upper surface of the base is provided with a sliding groove, the inner wall of the sliding groove is slidably connected with a moving seat, and the moving seat is provided with a threaded hole; according to the device, the air bag and the bottom plate which can move relative to the lifting box are arranged, so that the device can slightly extrude a liner through the dead weight of the air bag before the liner is extruded, and the liner is prevented from falling off, so that the liner is prevented from falling off, and the liner is prevented from falling off. The air bubbles in the glue on the lower side of the liner have time to be discharged, and the liner can be stretched to be flatter, so that the bonding effect is better, and the device has the advantages of being high in practicability and capable of avoiding unstable bonding caused by the air bubbles in the bonding glue.

Description

Technical Field

[0001] The invention relates to the technical field of oxygen supply mask processing, in particular to a bonding device used for oxygen supply mask processing. Background Art

[0002] The breathing mask can be covered on the nose or mouth of a person to assist the person in breathing. The existing breathing masks are provided with pads at the contact position with the face of the person, which can prevent the mask from leaking and make the person more comfortable to wear. When processing the existing breathing masks, the pads are usually bonded to the corresponding positions of the mask body with adhesives such as glue. The glue needs to be applied to the corresponding positions of the mask body, but the adhesive application process will be uneven, resulting in a certain gap between the mask body and the pad, making the curved mask prone to leaking; The existing Chinese patent with publication number CN115502031A discloses a gasket bonding device for processing a respiratory mask. This device can prevent dust from being present at the glue application site when applying glue to the respiratory mask, thereby reducing the bonding effect of the glue. However, after the glue is applied, the gasket itself deforms during the bonding process and the presence of bubbles inside the glue will cause the gasket and the mask to be bonded loosely. Therefore, it is necessary to design a bonding device for oxygen mask processing that is practical and can avoid loose bonding caused by bubbles inside the bonding glue. Summary of the invention

[0003] The object of the present invention is to provide a bonding device for processing oxygen supply masks to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a bonding device for processing oxygen masks, comprising a base, a load-bearing frame fixedly connected to the upper side of the base, a sliding groove is provided on the upper surface of the base, a moving seat is slidably connected to the inner wall of the sliding groove, a threaded hole is provided on the moving seat, a threaded nail is threadedly connected to the inner wall of the threaded hole, the lower end of the threaded nail contacts the outer wall of the base, a hydraulic rod is fixedly connected to the upper side of the load-bearing frame, a connecting plate is fixedly connected to the upper end of the hydraulic rod, a moving hole penetrating up and down is provided in the middle part of the load-bearing frame, a lifting box is slidably connected to the inner wall of the moving hole, the outer wall of the lifting box is fixedly connected to the outer wall of the connecting plate, an extrusion mechanism is provided on the lower side of the lifting box, the lifting box is a hollow structure, and a cooling mechanism is provided on the upper side of the lifting box.

[0005] The cam is provided with a plurality of protruding members on the bottom of the support frame, and the plurality of protruding members on the bottom of the support frame are provided with a plurality of protruding members on the bottom of the support frame.

[0006] According to the above technical solution, the upper surface of the base plate is rotatably connected to a threaded column through a bearing, the upper end of the threaded column passes through the fixed plate and extends to the interior of the lifting box, the outer wall of the threaded column is threadedly connected to the inner wall of the fixed plate, and the upper outer wall of the threaded column is fixedly connected to a counterweight block, and the right side of the counterweight block protrudes to the right.

[0007] According to the above technical solution, the cooling mechanism includes a connecting column, the lower side of the connecting column is inserted into the upper inner side of the lifting box, the outer wall of the connecting column is slidably connected to the upper inner wall of the lifting box, the outer side wall of the connecting column is fixedly connected with an upper cover, the lower end of the upper cover is fixedly connected to the upper outer wall of the load-bearing frame, the cooling mechanism includes a connecting pipe, the upper end of the connecting pipe is fixedly connected to the lower inner wall of the lifting box, the lower end of the connecting pipe is fixedly connected with an exhaust ring, the outer wall of the exhaust ring is fixedly connected to the outer wall of the bottom plate, an exhaust gap is opened on the lower side of the exhaust ring, and the interior of the lifting box and the interior of the exhaust ring are connected through a connecting pipe.

[0008] According to the above technical solution, the heating mechanism includes a prism, the lower end of the prism is fixedly connected to the upper end of the threaded column, a sleeve is provided on the outside of the prism, the inner wall of the sleeve does not contact the outer wall of the prism, the outer wall of the sleeve is fixedly connected to a bracket, one end of the bracket is fixedly connected to the inner wall of the lifting box, the upper side of the outer wall of the sleeve is rotatably connected to a rotating block through a bearing, the inner wall of the rotating block is slidably connected to the outer wall of the prism, the rotating block is fixedly connected to a coil, the upper side of the bracket is fixedly connected to a fixing ring, and the fixing ring is arranged on the coil An annular cylindrical structure is provided on the outer part of the upper side, and a plurality of magnets are fixedly connected to the inner wall of the fixed ring. Both ends of the coil pass through the rotating block and extend to the lower side of the rotating block, and both ends of the coil are fixedly connected to conductive sliders, and the lower side of the conductive sliders is slidably connected to conductive slip rings, and the mass and height of the conductive sliders and conductive slip rings on the lower sides of both ends of the coil are inconsistent, and a wire is fixedly connected to the lower side of the outer wall of the conductive slip ring, and the lower end of the wire passes through the lifting box and the bottom plate and extends to between the bottom plate and the airbag, and a heating tube is fixedly connected to the lower side of the bottom plate.

[0009] According to the above technical solution, the outer wall of the prism and the middle inner wall of the rotating block are both hexagonal structures, the prism and the rotating block cannot rotate relative to each other, and the wire is electrically connected to the heating tube.

[0010] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention is provided with an airbag and a bottom plate that can move relative to the lifting box, so that the device can slightly squeeze the pad by the deadweight of the airbag before squeezing the pad, so that the bubbles in the glue on the lower side of the pad have time to be discharged, and the pad can be stretched flatter, thereby achieving a better bonding effect; By providing a fixed plate that can be slightly deflected relative to the lifting box and a rotatable and unevenly weighted counterweight, the device can rely on the rotation of the counterweight to drive the fixed plate to vibrate slightly during the process of squeezing the cushion, thereby allowing the airbag to bond the cushion to the mask more evenly; By providing a coil structure that can rotate with the threaded column, the device can heat up the airbag by squeezing the liner with downward pressure during the downward pressing process, and the squeezing force on the liner is gradually increased, so that the glue can better bond the liner to the mask; By providing a cooling mechanism, the device can quickly blow air to cool down the surface of the liner after bonding the liner, thereby cooling and solidifying the liner to avoid displacement of the liner. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal structure of the base of the present invention; Figure 3 It is a schematic diagram of the internal structure of the present invention; Figure 4 It is a schematic diagram of the internal structure of the lifting box of the present invention; Figure 5 It is a schematic diagram of the structure of the extrusion mechanism of the present invention; Figure 6 The present invention Figure 5 A is a schematic diagram of the enlarged structure of the middle part; In the figure: 1, base; 2, load-bearing frame; 3, moving seat; 4, threaded nail; 5, hydraulic rod; 6, connecting plate; 7, lifting box; 8, extrusion mechanism; 9, cooling mechanism; 801, fixed plate; 802, spring; 803, plug rod; 804, bottom plate; 805, air bag; 806, heating mechanism; 807, threaded column; 808, counterweight; 601, prism; 602, sleeve; 603, bracket; 604, rotating block; 605, coil; 606, fixing ring; 607, magnet; 608, conductive slider; 609, conductive slip ring; 610, wire; 611, heating tube; 901, connecting column; 902, upper cover; 903, exhaust ring; 904, connecting tube. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] See also Figure 1-6 The present invention provides a technical solution: a bonding device for processing oxygen masks, comprising a base 1, a load-bearing frame 2 is fixedly connected to the upper side of the base 1, a slide groove is provided on the upper surface of the base 1, a moving seat 3 is slidably connected to the inner wall of the slide groove, a threaded hole is provided on the moving seat 3, a threaded nail 4 is threadedly connected to the inner wall of the threaded hole, the lower end of the threaded nail 4 contacts the outer wall of the base 1, a hydraulic rod 5 is fixedly connected to the upper side of the load-bearing frame 2, a connecting plate 6 is fixedly connected to the upper end of the hydraulic rod 5, a moving hole penetrating up and down is provided in the middle of the load-bearing frame 2, a lifting box 7 is slidably connected to the inner wall of the moving hole, the outer wall of the lifting box 7 is fixedly connected to the outer wall of the connecting plate 6, an extrusion mechanism 8 is provided on the lower side of the lifting box 7, the lifting box 7 is a hollow structure, and a cooling mechanism 9 is provided on the upper side of the lifting box 7; The squeezing mechanism 8 includes a fixed plate 801, a mounting opening is provided on the lower side of the lifting box 7, the inner wall of the mounting opening on the lower side of the lifting box 7 is rotatably connected to the outer wall of the fixed plate 801 through a bearing, protruding structures are provided on both sides of the outer wall of the fixed plate 801, and a spring 802 is fixedly connected to the protruding structure of the fixed plate 801, a spring groove is provided on the lower side of the inner wall of the lifting box 7, the protruding structure on the fixed plate 801 is located inside the spring groove, the front and rear width of the protruding structure on the fixed plate 801 is smaller than the front and rear width of the inner wall of the spring groove, one end of the spring 802 is fixedly connected to the inner wall of the spring groove, a sliding hole is provided on the fixed plate 801, and a plug rod 803 is inserted into the inner wall of the sliding hole, the upper end of the plug rod 803 is located inside the lifting box 7, and the plug rod 803 The lower end extends to the lower side of the fixed disk 801 and is fixedly connected with a bottom plate 804. The upper side of the bottom plate 804 does not contact the outer wall of the fixed disk 801. The lower side of the bottom plate 804 is fixedly connected with an air bag 805. The space between the upper side of the air bag 805 and the lower side of the bottom plate 804 is filled with gas. The extrusion mechanism 8 also includes a heating mechanism 806. The heating mechanism 806 is located inside the lifting box 7. The upper surface of the bottom plate 804 is rotatably connected with a threaded column 807 through a bearing. The upper end of the threaded column 807 passes through the fixed disk 801 and extends to the inside of the lifting box 7. The outer wall of the threaded column 807 is threadedly connected to the inner wall of the fixed disk 801. The upper outer wall of the threaded column 807 is fixedly connected with a counterweight block 808, and the right side of the counterweight block 808 protrudes to the right. During use, the threaded nail 4 is rotated to make the threaded nail 4 disengage from the surface of the base 1, and then the movable seat 3 is moved to a suitable position and the threaded nail 4 is rotated to make the lower side of the threaded nail 4 contact with the upper surface of the base 1, thereby fixing the movable seat 3, and then the mask coated with glue is placed on the upper side of the two movable seats 3 to form a fixation, and after the liner is placed on the glue, the hydraulic rod 5 is started to pull down the lifting box 7, so that the lifting box 7 drives the extrusion mechanism 8 to descend. Since the lower side of the airbag 805 will first contact the upper side of the liner, at this time, the bottom plate 804 can keep relatively still the liner by the sliding of the insertion rod 803 in the fixed plate 801, so that the lower side of the airbag 805 relies on its own weight to slightly compress the liner first, so that the liner can slowly deform and stretch during the compression, thereby reducing the deformation and wrinkles of the liner caused by direct compression, so that the liner can be completely flattened, and the bubbles can be discharged, reducing the problems of instability caused by the bonding of the liner; Then, as the lifting box 7 continues to descend, the lower side of the lifting box 7 will press the bottom plate 804, so that the bottom plate 804 and the airbag 805 are pressed downward, and then the airbag 805 completely bonds the cushion according to the shape of the mask, so that the bonding step is completed; After the airbag 805 contacts the cushion, the lifting box 7 continues to descend, which will reduce the distance between the lifting box 7 and the bottom plate 804, and then the threaded column 807 will penetrate into the lifting box 7. Since the outer wall of the threaded column 807 is rotatably connected to the outer wall of the bottom plate 804, and the outer wall of the threaded column 807 is threadedly connected to the inner wall of the fixed plate 801, the threaded column 807 will rotate during the process of the lifting box 7 descending relative to the bottom plate 804. Since the outer wall of the threaded column 807 is fixedly connected to the counterweight block 808, and the left and right masses of the counterweight block 808 are uneven, the rotation of the threaded column 807 will drive the vibration of the bottom plate 804, the insertion rod 803, and the fixed plate 801, and then the fixed plate 801 will vibrate slightly under the support of the spring 802, so that the lower side of the airbag 805 vibrates and squeezes the upper side of the cushion slightly, so that the bubbles in the glue can be discharged outward during the vibration, and the glue is distributed more evenly, thereby increasing the firmness of the bonding. Then, after the extrusion is completed, the hydraulic rod 5 is started to push the lifting box 7 upward, driving the extrusion mechanism 8 to move away from the upper side of the pad; The heating mechanism 806 includes a prism 601, the lower end of the prism 601 is fixedly connected to the upper end of the threaded column 807, a sleeve 602 is arranged on the outer side of the prism 601, the inner wall of the sleeve 602 does not contact the outer wall of the prism 601, the outer wall of the sleeve 602 is fixedly connected to a bracket 603, one end of the bracket 603 is fixedly connected to the inner wall of the lifting box 7, the upper side of the outer wall of the sleeve 602 is rotatably connected to a rotating block 604 through a bearing, the inner wall of the rotating block 604 is slidably connected to the outer wall of the prism 601, the rotating block 604 is fixedly connected to the coil 605, the upper side of the bracket 603 is fixedly connected to a fixing ring 606, the fixing ring 606 is an annular cylindrical structure arranged on the outer side of the upper side of the coil 605, the inner wall of the fixing ring 606 is fixedly connected to a plurality of magnets 607, and the coil 6 Both ends of the coil 605 penetrate the rotating block 604 and extend to the lower side of the rotating block 604, and both ends of the coil 605 are fixedly connected with a conductive slider 608, and the lower side of the conductive slider 608 is slidably connected with a conductive slip ring 609, and the mass and height of the conductive slider 608 and the conductive slip ring 609 at the lower sides of both ends of the coil 605 are inconsistent, and the lower side of the outer wall of the conductive slip ring 609 is fixedly connected with a wire 610, and the lower end of the wire 610 penetrates the lifting box 7 and the bottom plate 804 and extends to between the bottom plate 804 and the airbag 805, and the lower side of the bottom plate 804 is fixedly connected with a heating tube 611, the outer wall of the prism 601 and the middle inner wall of the rotating block 604 are both hexagonal structures, the prism 601 and the rotating block 604 cannot rotate relative to each other, and the wire 610 is electrically connected to the heating tube 611; During the rotation of the threaded column 807, the threaded column 807 drives the prism 601 to rotate, and then the prism 601 drives the rotating block 604, the coil 605 and other structures to rotate. Since the magnet 607 is fixed relative to the lifting box 7, during the rotation of the coil 605, the current is generated in the path of the coil 605, the conductive slider 608, the conductive slip ring 609, the wire 610 and the heating tube 611, and then the heating tube 611 heats up the gas inside the airbag 805, so that when the airbag 805 contacts the cushion, the glue is further softened by the temperature of the airbag 805, so that the bubbles inside the glue are easily discharged. And because the masses and positions of the two conductive sliders 608 and the conductive slip ring 609 under the coil 605 are inconsistent, the vibration of the fixed disk 801 can be promoted during rotation; The cooling mechanism 9 includes a connecting column 901, the lower side of which is plugged into the upper side of the interior of the lifting box 7, the outer wall of the connecting column 901 is slidably connected to the upper side of the inner wall of the lifting box 7, the outer side wall of the connecting column 901 is fixedly connected to an upper cover 902, the lower end of the upper cover 902 is fixedly connected to the upper side of the outer wall of the load-bearing frame 2, the cooling mechanism 9 includes a connecting pipe 904, the upper end of the connecting pipe 904 is fixedly connected to the lower inner wall of the lifting box 7, the lower end of the connecting pipe 904 is fixedly connected to an exhaust ring 903, the outer wall of the exhaust ring 903 is fixedly connected to the outer wall of the bottom plate 804, an exhaust slit is provided on the lower side of the exhaust ring 903, and the interior of the lifting box 7 is connected to the interior of the exhaust ring 903 through the connecting pipe 904; During the descent of the lifting box 7, since the connecting column 901 is fixed relative to the load-bearing frame 2, the descent of the lifting box 7 will increase the internal space of the lifting box 7 and the connecting column 901, and then the interior of the lifting box 7 will be inhaled through the connecting pipe 904 and the exhaust ring 903. In the process of lifting the extrusion mechanism 8 after the pad is extruded, the space between the lifting box 7 and the connecting column 901 is reduced, so that the internal gas of the lifting box 7 is discharged through the connecting pipe 904 and the exhaust ring 903, and the airflow blows to the surface of the pad that has just been heated and bonded by the airbag 805, accelerating the cooling speed of the pad and the solidification speed of the glue, thereby ensuring that the pad and the mask will not be displaced later.

[0014] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0015] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bonding device for processing an oxygen mask, comprising a base (1), characterized in that: The upper side of the base (1) is fixedly connected to a load-bearing frame (2); a slide groove is provided on the upper surface of the base (1); a movable seat (3) is slidably connected to the inner wall of the slide groove; a threaded hole is provided on the movable seat (3); a threaded nail (4) is threadedly connected to the inner wall of the threaded hole; the lower end of the threaded nail (4) contacts the outer wall of the base (1); a hydraulic rod (5) is fixedly connected to the upper side of the load-bearing frame (2); the upper end of the hydraulic rod (5) is fixedly connected to a connecting plate (6); a movable hole penetrating from top to bottom is provided in the middle of the load-bearing frame (2); a lifting box (7) is slidably connected to the inner wall of the movable hole; the outer wall of the lifting box (7) is fixedly connected to the outer wall of the connecting plate (6); an extrusion mechanism (8) is provided on the lower side of the lifting box (7); the lifting box (7) is a hollow structure; and a cooling mechanism (9) is provided on the upper side of the lifting box (7).

2. A bonding device for oxygen mask processing according to claim 1, characterized in that: The extrusion mechanism (8) comprises a fixed plate (801); a mounting opening is provided on the lower side of the lifting box (7); the inner wall of the mounting opening on the lower side of the lifting box (7) is rotatably connected to the outer wall of the fixed plate (801) via a bearing; protruding structures are provided on both sides of the outer wall of the fixed plate (801); a spring (802) is fixedly connected to the protruding structure of the fixed plate (801); a spring groove is provided on the lower side of the inner wall of the lifting box (7); the protruding structure on the fixed plate (801) is located inside the spring groove; the front-to-rear width of the protruding structure on the fixed plate (801) is smaller than the front-to-rear width of the inner wall of the spring groove; one end of the spring (802) is fixedly connected to the inner wall of the spring groove The fixed plate (801) is provided with a sliding hole, the inner wall of the sliding hole is plugged with an insertion rod (803), the upper end of the insertion rod (803) is located inside the lifting box (7), the lower end of the insertion rod (803) extends to the lower side of the fixed plate (801) and is fixedly connected to a bottom plate (804), the upper side of the bottom plate (804) does not contact the outer wall of the fixed plate (801), the lower side of the bottom plate (804) is fixedly connected to an air bag (805), the space between the upper side of the air bag (805) and the lower side of the bottom plate (804) is filled with gas, and the extrusion mechanism (8) further includes a heating mechanism (806), and the heating mechanism (806) is located inside the lifting box (7).

3. A bonding device for oxygen mask processing according to claim 2, characterized in that: The upper surface of the bottom plate (804) is rotatably connected to a threaded column (807) via a bearing; the upper end of the threaded column (807) passes through the fixed plate (801) and extends to the interior of the lifting box (7); the outer wall of the threaded column (807) is threadedly connected to the inner wall of the fixed plate (801); a counterweight (808) is fixedly connected to the upper outer wall of the threaded column (807); and the right side of the counterweight (808) protrudes to the right.

4. A bonding device for oxygen mask processing according to claim 3, characterized in that: The cooling mechanism (9) comprises a connecting column (901), the lower side of which is plugged into the upper side of the interior of the lifting box (7), the outer wall of the connecting column (901) is slidably connected to the upper side of the inner wall of the lifting box (7), the outer side wall of the connecting column (901) is fixedly connected to an upper cover (902), the lower end of the upper cover (902) is fixedly connected to the upper side of the outer wall of the load-bearing frame (2), the cooling mechanism (9) comprises a connecting pipe (904), the upper end of the connecting pipe (904) is fixedly connected to the lower inner wall of the lifting box (7), the lower end of the connecting pipe (904) is fixedly connected to an exhaust ring (903), the outer wall of the exhaust ring (903) is fixedly connected to the outer wall of the bottom plate (804), an exhaust slit is provided on the lower side of the exhaust ring (903), and the interior of the lifting box (7) and the interior of the exhaust ring (903) are connected via the connecting pipe (904).

5. A bonding device for oxygen mask processing according to claim 4, characterized in that: The heating mechanism (806) comprises a prism (601), the lower end of the prism (601) is fixedly connected to the upper end of the threaded column (807), a sleeve (602) is arranged on the outer side of the prism (601), the inner wall of the sleeve (602) does not contact the outer wall of the prism (601), the outer wall of the sleeve (602) is fixedly connected to a bracket (603), one end of the bracket (603) is fixedly connected to the inner wall of the lifting box (7), the upper side of the outer wall of the sleeve (602) is rotatably connected to a rotating block (604) via a bearing, the inner wall of the rotating block (604) is slidably connected to the outer wall of the prism (601), the rotating block (604) is fixedly connected to a coil (605), the upper side of the bracket (603) is fixedly connected to a fixing ring (606), and the fixing ring (606) is arranged on the upper side of the coil (605). The outer annular cylindrical structure is characterized in that a plurality of magnets (607) are fixedly connected to the inner wall of the fixing ring (606), both ends of the coil (605) penetrate the rotating block (604) and extend to the lower side of the rotating block (604), and both ends of the coil (605) are fixedly connected to conductive sliders (608), and the lower side of the conductive sliders (608) is slidably connected to conductive slip rings (609), and the mass and height of the conductive sliders (608) and conductive slip rings (609) at the lower sides of both ends of the coil (605) are inconsistent, and a wire (610) is fixedly connected to the lower side of the outer wall of the conductive slip ring (609), and the lower end of the wire (610) penetrates the lifting box (7) and the bottom plate (804) and extends to between the bottom plate (804) and the airbag (805), and the lower side of the bottom plate (804) is fixedly connected to a heating tube (611).

6. A bonding device for oxygen mask processing according to claim 5, characterized in that: The outer wall of the prism (601) and the middle inner wall of the rotating block (604) are both hexagonal structures; the prism (601) and the rotating block (604) cannot rotate relative to each other; and the wire (610) is electrically connected to the heating tube (611).

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