Tool and method for dismounting a seal from a groove

Abstract

The tool comprises an integral end piece which is symmetrical about a longitudinal median plane and has a flat lower surface (20) from which two pads (21) project, and an upper surface provided with two facets (22) inclined with respect to the lower surface (20) and extending towards the end of the pads (21), forming a scraping tip.

Description

Tools and methods for removing seals from grooves Technical Field

[0001] The present invention relates to a tool for removing a seal from a groove, and a method for removing a seal from a groove using such a tool. Background Technology

[0002] Hydroentangling refers to a web-bonding process that utilizes water flow, widely used in the field of nonwoven fabrics. For this, a jetting device is required to uniformly spray pressurized water at a pressure of 1-400 bar across the entire length of the machine-formed fabric. There are two main water jetting methods: 1. Water needle – nozzle – distribution chamber; 2. Water needle – slit. The water jetting device, also known as a jetting device, mainly consists of a body and a pressure-resistant hydroentangling head. The hydroentangling head defines an internal cavity with an inlet. The internal cavity communicates with the insertion part of the water needle plate. The water needle plate has an outlet slit leading to the outside of the hydroentangling head or jetting device. On the hydroentangling head, an annular groove is formed around the outlet slit. This groove is shaped like an athletic track, with two opposing parts, each defined by an inner and outer edge, and two curved ends. An O-ring seal is placed in the groove to ensure the tightness and sealing of the water needle plate, thereby ensuring that pressurized water can only be sprayed out through the nozzles on the water needle plate of the jet device. Summary of the Invention

[0003] The purpose of this invention is to provide a seal removal tool with the following characteristics: it can completely remove seals that are particularly difficult to access in industrial machines without damaging the seals, without leaving any residue on the hydroentangle head, and without requiring the opening of the rear orifice of the hydroentangle head.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a disassembly tool for an elastic annular seal of a spraying device, the tool comprising an integrally formed end piece, the end piece being symmetrical about a longitudinal centerline plane and having a flat lower surface and an upper surface, two longitudinal pads extending from the lower surface and each pad having a front end, the upper surface being machined from front to back with:

[0005] - At the front of the upper surface, two small planes inclined relative to the lower surface extend toward the end of the pad, forming scraping tips;

[0006] - A T-shaped ramp with a lower transverse edge and a highest upper transverse edge, the two small planes extending from the lower transverse edge, the width of the highest upper transverse edge being smaller than that of the lower transverse edge, and sharing the front transverse edge of the longitudinal center bar;

[0007] - The width of the central rod is smaller than the width of the lower surface.

[0008] Insert the end piece into the cavity of the spraying device until the scraping tip reaches the groove where the rectangular section of the seal is located, scrape, and lift the rectangular section. When the end piece extends into the cavity through the orifice and reaches the curved section farthest from the orifice, lift the curved section. At this point, remove the end piece, and the entire seal can be removed.

[0009] Preferably, the end piece may include two longitudinal small rods located on either side of the longitudinal center rod, the longitudinal small rods being longitudinally aligned with the small plane, the thickness of the longitudinal small rods being less than the thickness of the center rod extending from the lowest transverse edge of the inclined plane, and the longitudinal small rods extending rearward beyond the center rod to the arc-shaped rear edge; the longitudinal small rods, the rear edge of the center rod, and the upper surface form a separate extension plate retainer mounting groove with an arc-shaped edge; the extension plate matches the arc-shaped rear edge, its thickness being equal to the thickness of the longitudinal small rod, and the sum of the thicknesses of the extension plate and the retainer being equal to the thickness of the center rod. The extension plate is longer than the end piece: the length of the extension plate is 1000 mm - 8000 mm, and the length of the end piece is 70 mm - 300 mm. The length extends along and is parallel to the centerline plane of the end piece; the width extends laterally relative to the length.

[0010] The angle between the inclined surface and / or the small plane and the lower surface of the end piece is between 5° and 30°, preferably between 10° and 20°, and most preferably 15°. Preferably, the angle between the inclined surface and the lower surface of the end piece is equal to the angle between the small plane and the lower surface of the end piece.

[0011] The end piece has a hole, and the pin of the retaining member passes through the hole through the opening of the extension plate stacked on the hole.

[0012] The present invention also relates to the use of the tool described herein to remove a seal from a cavity of a spraying device, the overall cross-section of the tool being slightly smaller than the cross-section of the cavity.

[0013] Finally, the present invention relates to a method for removing a seal from a spray device cavity, comprising the following steps: inserting the tool of the present invention into the water jet head side pad in the spray device cavity until the nearest curved segment of the seal is released; pulling out the curved segment, preferably holding it in one's hand; hooking the curved segment onto a hook or button on the operator side of the spray device; then, further inserting the tool of the present invention into the water jet head side pad until the transmission box side stop, thereby releasing the seal; and finally, removing the entire tool and the seal. Attached Figure Description

[0014] The accompanying drawings in the embodiments of this invention are for reference only:

[0015] Figure 1 is a cross-sectional view of the spraying device applicable to the disassembly tool described in this invention;

[0016] Figure 2 is a partial perspective view of the upper part of the main body removed from the end of the injection device cavity;

[0017] Figure 3 is an exploded perspective view of the tool described in this invention;

[0018] Figure 4 is a bottom perspective view of the tool end piece described in this invention;

[0019] Figure 5 is a top perspective view of the tool end piece described in this invention. Detailed Implementation

[0020] As shown in Figure 1, the spraying device includes an upper body 1, and a water jet head 2 is screwed onto the upper body 1, together forming a stainless steel pressure-resistant spraying device. The upper body and the water jet head define an internal cavity 3; the internal cavity 3 is provided with a water inlet, which communicates with the insertion part of the water needle plate (not shown in the figure) through a slit 4, and communicates with the water outlet slit 5 leading to the outside of the water jet head or the spraying device.

[0021] On the hydroentangle head 2, an annular groove 6 is formed around the outlet slit 5. A resilient O-ring seal 7 is installed into the groove. As shown in Figure 2, the groove 6 has two opposing rectangular portions 8 and 9, each defined by inner edges 10 and 11 and outer edges 12 and 13, and two curved ends 14 defined only by the inner edges (only one end is shown in the figure). The groove is formed in the curved ends. If the seal has been pre-stretched, the portion of the seal falling into the aforementioned defined area easily springs back onto the edge 14.

[0022] As shown in Figure 2, a second orifice 15 is provided on the second front surface of the hydroentangle head 2, the size of which should allow the sealing installation tool to pass through. The second orifice 15, the surface 17 and the lower surface 18 of the body 1 define a channel 16; the other end of the channel 16 is provided with a first orifice 15 of the same size, in which a groove 6 is provided.

[0023] The cross-section of the second opening 15 and the cross-section of the tunnel are just larger than the rectangle defined according to the overall dimensions of the installation tool.

[0024] The tool of this invention includes an integrally formed end piece symmetrical about a longitudinal centerline plane and having a flat lower surface 20. The lower surface 20 is equipped with two longitudinal pads 21; each longitudinal pad has a front end and an upper surface, extending from the lower surface 20. In the figures, surface 20 is the lower surface; however, when the tool is intended for use with an inclined or differently oriented spraying device, the lower surface 20 may be located above another surface. In this application, for ease of explanation, we simply refer to the two surfaces as the lower surface and the upper surface, respectively.

[0025] On the upper surface opposite to the lower surface 20, from front to back, there are two small planes 22 that are inclined at 15° relative to the lower surface 20 and extend toward the end of the pad 21 to form scraping tips.

[0026] The T-shaped inclined surface 23 is inclined at 15° relative to the lower transverse edge and the highest upper transverse edge; two small planes 22 extend from the lower transverse edge; the width of the highest upper transverse edge is less than the width of the lower transverse edge and is shared with the front transverse edge of the longitudinal center rod 24; the width of the center rod 24 is less than the width of the lower surface 20. Two longitudinal small rods 25 are provided on both sides of the center rod 24, the longitudinal small rods 25 are longitudinally aligned with the small planes 22, the thickness of the longitudinal small rods 25 is less than the thickness of the center rod 24, and the longitudinal small rods 25 extend rearward beyond the center rod 24; the rear edges of the longitudinal small rods 25 and the center rod 24 form a separate extension plate 27 retainer 26 mounting groove with an arc-shaped edge on the upper surface; the extension plate 27 matches the arc-shaped rear edge. The thickness of the extension plate 27 is equal to the thickness of the longitudinal small rod 25, and the sum of the thicknesses of the extension plate 27 and the retainer 26 is equal to the thickness of the center rod 24. The length of the extension plate is 6 m, and the length of the end piece is 1 m.

[0027] The end piece has a hole 28. The pin 29 of the retainer 26 passes through the hole. The extension plate 27 is detachably tightened to the end piece by two countersunk screws 30 and two nuts 31, the two countersunk screws 30 not extending beyond the lower surface 20; the extension plate 27 is held to the rest of the tool by the retainer 26.

[0028] Extension plate 27 is made of stainless steel strip, while the remaining components are made of rigid plastic material. Extension plate 27 can be rolled up.

Claims

1. A tool for removing a seal from a groove, characterized in that, The tool includes an integrally formed end piece symmetrical about the longitudinal centerline plane and having a flat lower surface (20) and an upper surface, with two longitudinal pads (21) extending from the lower surface (20) and each pad having a front end, and the upper surface being machined from front to back with: - at the front, two small planes (22) inclined relative to the lower surface (20) extending toward the end of the pad (21) to form scraping tips; - T-shaped ramp (23) having a lower transverse edge and a highest upper transverse edge, the two small planes (22) extending from the lower transverse edge, the width of the highest upper transverse edge being smaller than that of the lower transverse edge and sharing with the front transverse edge of the longitudinal center rod (24); and - the center rod (24) having a width smaller than that of the lower surface (20).

2. The tool according to claim 1, characterized in that, The end piece includes two longitudinal small rods (25) located on both sides of the central rod (24), the longitudinal small rods (25) being longitudinally aligned with the small plane (22), the thickness of the longitudinal small rods (25) being less than the thickness of the central rod (24) extending from the lowest upper transverse edge of the inclined plane (23), the longitudinal small rods (25) extending rearward beyond the central rod (24) to the arc-shaped rear edge, the longitudinal small rods (25), the rear edge of the central rod (24) and the upper surface forming a mounting groove for a retainer (26) of a separate extension plate (27) with an arc-shaped edge; the extension plate (27) matches the arc-shaped rear edge, its thickness is equal to the thickness of the longitudinal small rods (25), and the sum of the thicknesses of the extension plate (27) and the retainer (26) is equal to the thickness of the central rod (24).

3. The tool according to claim 1, characterized in that, The end piece has a hole (28), and the pin (29) of the retainer (26) passes through the hole (28) through the opening of the extension plate (27) stacked on the hole (28).

4. The tool according to any one of the preceding claims, characterized in that, The angle between the small plane (22) and the lower surface (20) of the end piece is between 5° and 30°.

5. The tool according to claim 1, characterized in that, The angle between the inclined surface (23) and the lower surface (20) of the end piece is between 5° and 30°.

6. The tool according to claim 4, characterized in that, The angle between the inclined plane (23) and the lower surface (20) is equal to the angle between the small plane (22) and the lower surface (20).

7. The tool according to claim 2, characterized in that, The extension plate (27) is longer than the end piece.

8. The tool according to claim 7, characterized in that, The length of the extension plate (27) is 1000 mm - 8000 mm, and the length of the end piece is 70 mm - 300 mm.

9. A method for removing a seal from a jetting device chamber using the tool described in any one of the preceding claims, characterized in that, The entire cross-section of the tool is just smaller than the cross-section of the chamber.

10. A method for removing a seal from a spray device cavity, characterized in that, The procedure includes the following steps: inserting the tool according to any one of claims 1-8 into the water jet head side pad in the spray device cavity until the nearest curved segment of the seal is released; pulling out the curved segment; hooking the curved segment onto a hook or button on the operator side of the spray device; then, further inserting the tool into the water jet head side pad until the drive side stop, thereby releasing the seal; and finally, removing the entire tool and seal.

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