Multi-layer folding sealing packing ring and manufacturing mold and method thereof

Abstract

According to the multi-layer folding sealing packing ring and the manufacturing mold and method thereof, a flexible graphite paper tape is wound and pre-bent on a pre-bending mold layer by layer to form a middle ring body with a wave-shaped section, or the flexible graphite paper tape is firstly wound into a straight tube shape and then is pre-bent on the pre-bending mold to form a middle ring body with a wave-shaped section; then the straight-barrel-shaped ring body is radially pressed into a middle ring body with the wave-shaped section through an outer mold with the bent inner wall, then the middle ring body is placed in a compression mold and axially compressed to form the ring body, and the ring body is provided with a folding section of a horizontal layer structure and a vertical section of a vertical structure and connected with the folding section; therefore, after being arranged in the stuffing box and pressed by the stuffing gland, an excellent sealing effect is achieved.

Description

Technical Field

[0001] The invention relates to the field of sealing fillers, in particular to a multi-layer folding sealing filler ring and a mold and a method for manufacturing the same. Background Art

[0002] In the existing sealing method of the valve body or valve cover and the valve stem (rotating shaft) of the control valve, the packing ring made of expanded flexible graphite is widely used, such as Figure 1 The figure shows a conventional flexible graphite ring. This structure will cause leakage after the valve stem or shaft of the control valve moves a certain number of times.

[0003] like Figure 2 It is the structure of a common flexible graphite packing ring on the market. The manufacturing method is to wrap flexible graphite paper tape of a certain width layer by layer and then press it with an axial compression mold and a press. On the cross section of the sealing ring after pressing, you can still see layers of graphite paper tape distributed vertically, and the sealing effect is not good; in a very small number of cases, the graphite paper tape can be seen to bend and deform due to compression, and the sealing effect is slightly better, but still cannot achieve the ideal effect.

[0004] In summary, how to improve the sealing effect of sealing packing has become an urgent problem that researchers in this field need to solve. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: how to improve the sealing effect of the sealing filler;

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] The present invention is a multi-layer folded sealing packing ring, comprising: an intermediate ring body formed by circumferentially winding a flexible graphite paper tape; the cross section formed by axially compressing the intermediate ring body comprises horizontal and multi-layered folded segments, and the multi-layer folded segments are connected end to end by vertical segments.

[0008] Furthermore, the inner circumferential wall and the outer circumferential wall of the ring body are both circular surfaces.

[0009] The present scheme also discloses a production mold for producing sealing fillers, including: a pre-bending mold, which is suitable for winding a flexible graphite paper tape and radially pressing the wound graphite paper tape to form an intermediate ring body, wherein the cross-sections of the inner circumferential wall and the outer circumferential wall layers of the intermediate ring body are wavy, and the wall thickness of the intermediate ring body is consistent; a compression mold, in which the intermediate ring body is placed and the intermediate ring body is axially compressed to form a ring body.

[0010] Furthermore, the pre-bending die includes: a rolling shaft; a rolling sleeve, which is locked on the rolling shaft, wherein the outer peripheral wall of the rolling sleeve has at least two first grooves in the circumferential direction, and a first annular protrusion is set between the two first grooves, and the first groove and the first protrusion are smoothly connected to form a wavy structure; a tool handle, which is arranged on one side of the rolling sleeve, and the end of which is hinged to the wheel frame; a rolling wheel, which is rotatably arranged at the wheel frame, and the outer peripheral wall of which has at least two second protrusions in the circumferential direction, the second protrusions are adapted to the first grooves, and a second groove is formed between the two second protrusions, and the second groove is adapted to the first protrusion; and also includes: a guide wheel, which is rotatably arranged at the wheel frame, and the outer peripheral wall of which has a fourth protrusion in the circumferential direction, and the graphite paper tape is pressed between the fourth protrusion and the first protrusion.

[0011] Furthermore, another pre-bending mold is disclosed, which includes: a rolling shaft; a rolling sleeve, which is locked on the rolling shaft, wherein the outer peripheral wall of the rolling sleeve has at least two first grooves in the circumferential direction, and a first annular protrusion is arranged between the two first grooves, and the first groove and the first protrusion constitute a wavy structure; two curved outer molds, which are arranged on the radial outside of the rolling sleeve, and the two curved outer molds are symmetrically arranged, and the inner wall of the curved outer mold has at least two third protrusions with an arc structure, and a third groove with an arc structure is formed between the two third protrusions; wherein the shape of the first groove matches that of the third protrusion, and the shape of the first protrusion matches that of the third groove.

[0012] Furthermore, the rolling sleeve is an annular structure composed of at least two split arc-shaped parts.

[0013] Furthermore, two pressure plates are sleeved on the rolling shaft, and the rolling sleeve is arranged between the two pressure plates, wherein the outer side surface of one pressure plate is against the shoulder of the rolling shaft, and the outer side surface of the other pressure plate is against the locking nut sleeved on the rolling shaft, and the inner side surfaces of the two pressure plates are buckled with the corresponding two side surfaces of the rolling sleeve.

[0014] Furthermore, the compression mold includes: a lower mold plate, the upper surface of which is detachably provided with an inner mold and an outer mold, and the inner mold and outer mold support members constitute a ring cavity for placing the intermediate ring body; an upper mold plate, the top of which is connected to the press, and the bottom of which is provided with a lower pressure ring inserted into the ring cavity.

[0015] The present scheme also discloses two methods for making multi-level folded packing sealing rings, one of which comprises the following steps: S1: pressing one end of the graphite paper tape between the first protrusion and the fourth protrusion of the rolling sleeve; S2: maintaining the relative rotation of the knife handle relative to the rolling sleeve, pressing the graphite paper tape between the rolling sleeve and the rolling wheel, and finally forming a wavy intermediate ring body; during the relative rotation process, the knife handle moves radially outward relative to the rolling sleeve; S3, placing the intermediate ring body in the annular cavity of the compression mold, pressing down the lower pressure plate, and axially compressing the intermediate ring body to form a ring body; S4, raising the lower pressure plate, and disassembling the compression mold to obtain the ring body.

[0016] Second: S1: Wind the graphite paper tape into a straight cylindrical structure and put it on the outside of the rolling sleeve; S2: Place the two curved outer molds on the radial outside of the rolling sleeve, and there is a certain gap between the two curved outer molds; S3: Move the two curved outer molds radially inward to compress the annular graphite paper tape between the curved outer molds and the rolling sleeve to form an intermediate ring body; S4: Place the intermediate ring body in the annular cavity of the compression mold, press down the upper mold plate, and axially compress the intermediate ring body to form a ring body; S4: Raise the upper mold plate, and disassemble the compression mold to obtain the ring body.

[0017] The above two methods can also be used to produce other sealing rings with the same shape.

[0018] The beneficial effects of the present invention are as follows: the present invention is a multi-layer folded packing sealing ring and its manufacturing mold and method, wherein the graphite paper tape is wound layer by layer on a pre-bending mold and pre-bent layer by layer to form an intermediate ring body with a wavy cross-section, or is first wound into a straight cylinder and radially pressed into an intermediate ring body with a wavy cross-section by an outer mold, and then the intermediate ring body is placed in a compression mold and axially compressed to form a ring body, the ring body having a folded section with a horizontal layer structure and a vertical section with a vertical structure and connecting the folded sections, so that it has an excellent sealing effect after being installed in a stuffing box and pressed with a stuffing gland. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] Figure 1 It is a schematic diagram of a conventional packing or other flexible graphite ring;

[0021] Figure 2 This is a structural diagram of common packing or other flexible graphite packing rings;

[0022] Figure 3 It is a structural diagram of the intermediate ring body of this scheme;

[0023] Figure 4 It is a structural diagram of the ring body of this scheme;

[0024] Figure 5yes Figure 4 Enlarged view of point A in the middle;

[0025] Figure 6 Schematic diagram of the structure of the pre-bending die in Example 1;

[0026] Figure 7 is a cross-sectional view of the rolling sleeve and the rolling shaft in Example 1 or Example 2;

[0027] Figure 8 This is a diagram showing the coordination of the rolling wheel, the guide wheel, and the wheel frame in Example 1;

[0028] Figure 9 is a side view of the rolling sleeve in Example 1 or Example 2;

[0029] Figure 10 is a front view of the rolling sleeve in Example 1 or Example 2;

[0030] Figure 11 is a cross-sectional view of the compression mold in Example 1 or Example 2;

[0031] Figure 12 Schematic diagram of the structure of the compression mold and the annular graphite paper strip in Example 2;

[0032] Figure 13 This is a schematic diagram of the structure of the compression mold and the intermediate ring in Example 2;

[0033] Figure 14 It is a structural schematic diagram of the curved outer mold in Example 2. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0035] Figure 1 It is a conventional flexible graphite ring structure. When used as a packing, it is easy to cause leakage after the valve stem or shaft of the control valve moves a certain number of times.

[0036] Figure 2 Yes Figure 1 The cross-sectional view shows that there are multiple layers of graphite paper from the inside out. After pressing, the graphite paper is distributed vertically, with small radial deformation and very poor sealing effect. A very small number of graphite papers can be seen to bend and deform due to compression, and the sealing effect is slightly better, but still not ideal.

[0037] Figure 4 、 Figure 5It is a schematic diagram of the ring body structure. The ring body 01 is formed by winding 3 layers (or more layers) of graphite paper tape and axially compressing the ring body. The cross section of the formed ring body has 12 folded segments 01, and the folded segments 1 are stacked horizontally. Each graphite paper tape is bent 4 times to form 4 horizontal folded segments 1. The 4 folded segments 1 are connected end to end by 3 vertical connecting segments 2. In this way, the cross section of the ring body is approximately "bow"-shaped. The inner and outer circumferential walls of the ring body 01 are flat circular surfaces. The outer circumferential wall of the ring body 01 contacts the stuffing box, and the inner circumferential wall contacts the valve stem or the rotating shaft. The cross section of the ring body has both vertically distributed connecting segments 2 and horizontally distributed folded segments 1. Therefore, when the ring body is installed in the stuffing box and compressed with the stuffing cover, the radial deformation is large, the overall elasticity is good, and the horizontally and vertically distributed graphite tape is conducive to preventing the medium from passing through in all directions, and has an excellent sealing effect after compression.

[0038] If the molding Figure 5 The ring body 01 shown is formed by a straight cylinder by a one-time axial compression molding directly through the graphite paper tape after being wound without passing through the intermediate ring body. During the molding process, the shape and distribution of the graphite paper on the cross section will be random, resulting in the folding section 1 not being set horizontally and the connecting section 2 not being set vertically, which has a poor sealing effect. In addition, during axial compression, the graphite paper tape will tear during the bending process, further reducing the sealing effect. Therefore, the direct compression method is adopted to obtain Figure 4 The ring body 01 shown has a poor yield, so the graphite paper strip needs to be pre-bent to form the intermediate ring body 02.

[0039] Figure 3 The schematic diagram of the structure of the intermediate ring body is first formed by winding the graphite paper tape to form the intermediate ring body 02. The cross section of the intermediate ring body is a wavy structure. Figure 4 In the figure, the graphite paper strip of ring 1 is bent 4 times, so Figure 3 The middle ring body 02 with a wavy cross-section has a wave crest 3 and two wave troughs 4. The graphite paper strip can be bent at the wave troughs 4 and wave crests 3 to form the middle ring body 02. In this way, the ring body 01 formed after the middle ring body 02 is axially compressed has a horizontal folding section 1 and a vertical connecting section 2.

[0040] Example 1

[0041] How to form the wound graphite paper tape into an intermediate ring body, such as Figure 6As shown, this solution discloses a pre-bending die 5, a rolling sleeve 52 is sleeved on the rolling shaft 51, and pressure plates 53 are provided at both ends of the rolling sleeve 52. The two pressure plates 53 are tightly arranged on the rolling shaft 51 under the rolling sleeve 52, one of the pressure plates 53 is against the shoulder of the rolling shaft 51, and the other pressure plate 53 is against the locking nut 54, so that the rolling sleeve 52 is limited to the rolling shaft 51. From the cross-sectional view, from left to right are the pressure plate 53, the rolling sleeve 52, the pressure plate 53, the locking nut 54, and the rolling shaft 51 passes through the above four connections; as shown in FIG. Figure 9 As shown, the outer wall profile of the rolling sleeve 52 has two first grooves 521 , and a wave-shaped structure of a first protrusion 522 is formed between the two first grooves 521 .

[0042] like Figure 8 As shown, a knife handle 55 is provided outside the rolling shaft 51, and a wheel frame 56 is hinged at the end of the knife handle 55. A rotatable rolling wheel 57 and a guide wheel 58 are provided on the wheel frame 56. The guide wheel 58 and the rolling wheel 57 are mounted on the wheel frame 56, and the wheel frame 59 can rotate within a certain range around the pin connected to the knife handle 55, so as to automatically adjust the angle when pressing the intermediate ring body, so that the guide wheel 58 and the rolling wheel 57 have uniform force on the intermediate ring body 02; the outer peripheral wall of the rolling wheel 57 has two second protrusions 571, and a second groove 572 is formed between the two second protrusions 571. The second groove 572 matches the first protrusion 522, and the second protrusion 571 matches the first groove 521; the outer peripheral wall of the guide wheel 58 has a fourth protrusion 581, which matches the first protrusion 522 of the rolling sleeve 52, and the fourth protrusion 581 and the first protrusion 522 cooperate to compress the graphite paper strip;

[0043] like Figure 9 As shown, the bottoms of the first groove 521 and the second groove 572 are arc-shaped surfaces, and the angle between the two side planes is ≥90°. Similarly, the tops of the first protrusion 522, the second protrusion 571, and the fourth protrusion 581 are arc-shaped surfaces, and the angle between the two side planes is ≥90°.

[0044] During the process of forming the intermediate ring body 02, the rolling shaft 51, the rolling sleeve 52, the two pressure plates 53, and the locking nut 54 are installed on the machine tool or other optional equipment. The machine tool or other optional equipment is used to drive the above five to rotate, and the tool handle 55 is connected to the tool holder, lying horizontally on the machine tool and located on one side of the rolling sleeve 52, and the rolling wheel 57 and the guide wheel 58 are abutted against the rolling sleeve 52, and the end of the graphite paper is pressed between the guide wheel 58 and the rolling sleeve 52. Then the rolling sleeve 52 is rotated to wrap the graphite paper around the rolling sleeve 52. The rolling wheel 57 and the rolling sleeve 52 cooperate to deform the graphite paper into a wavy intermediate ring body 02. As the thickness of the graphite paper increases during the winding process, the tool handle 55 needs to be continuously moved radially away from the rolling sleeve 52.

[0045] like Figure 10As shown, in this solution, the rolling sleeve 52 is a split design, and the rolling sleeve is composed of four split arc-shaped parts 523 of a, b, c, and d. After the rolling forming of the intermediate ring body 02 is completed, the rolling sleeve 52 is separated from the rolling shaft 51, and then the rolling sleeve 52 is split, so that the intermediate ring body 02 can be separated from the rolling sleeve 52; Figure 7 The inner walls of the two pressure plates 53 are provided with annular grooves, and the outer walls of the rolling sleeve 52 composed of four split arc-shaped parts 523 are provided with protrusions matching the grooves. The pressure plate 53 and the rolling sleeve 52 are buckled to prevent the split arc-shaped parts 523 from separating during operation.

[0046] like Figure 11 As shown, after the intermediate ring body is formed, the intermediate ring body needs to be compressed in the middle axial direction to form a ring body. In this process, a compression mold 6 is needed. The lower template 61 of the compression mold 6 is fixed on the machine tool. The lower template 61 is detachably provided with an inner mold 62 and an outer mold 63. An annular cavity 64 for placing the intermediate ring body 02 is formed between the inner mold 62 and the outer mold 63. The outer mold 63 has an inner annular wall structure, and the inner film 62 can adopt a cylindrical structure. The radial width of the annular cavity 64 needs to be the same as the radial width of the intermediate ring body 02. The width is matched, and the intermediate ring body 02 is positioned in the ring cavity 64. The upper template 65 is connected to the press. The lower pressure ring 66 at the bottom of the upper template 65 can be inserted into the ring cavity 64. The radial width of the ring cavity 64 matches the radial width of the lower pressure ring 66. The intermediate ring body 02 is axially compressed to form the ring body 01. After compression, the outer diameter of the ring body 01 is consistent with the inner diameter of the outer mold 63, and the inner diameter of the ring body 01 is consistent with the outer diameter of the inner mold 62. The ring body 01 is obtained by separating the outer mold 63, the inner mold 62 and the lower template 61.

[0047] The present scheme also discloses a method for manufacturing a multi-level folded sealing packing ring, comprising the following steps: S1: pressing one end of the graphite paper tape between the first protrusion 522 and the fourth protrusion 581 of the rolling sleeve 52; S2: maintaining the relative rotation of the knife handle 55 relative to the rolling sleeve 52, pressing the graphite paper tape between the rolling sleeve 52 and the rolling wheel 57, and finally forming a wavy intermediate ring body 02; during the relative rotation process, the knife handle 55 moves radially outward relative to the rolling sleeve 52; S3, placing the intermediate ring body 02 in the annular cavity 64 of the compression mold 6, pressing down the lower pressure ring 66, and axially compressing the intermediate ring body 02 to form a ring body 01; S4, raising the lower pressure ring 66, and disassembling the compression mold 5 to obtain the ring body 01.

[0048] Example 2

[0049] The compression die in Example 2 is exactly the same as the compression die in Example 1, and the pre-bending die is substantially the same as the pre-bending die 5 in Example 1. The difference is that Example 1 uses a knife handle 55 and a rolling sleeve 52 to achieve radial bending while winding the graphite paper strip; Figure 12-14As shown, in Example 2, two curved outer molds 510 are used to perform radial compression to achieve the molding of the intermediate ring body 02.

[0050] like Figure 12-14 As shown, the specific structure of the pre-bending die in Example 2 is as follows: a rolling sleeve 52 is sleeved on the rolling shaft 51, and pressure plates 53 are provided at both ends of the rolling sleeve 52. The two pressure plates 53 are tightly arranged on the rolling shaft 51 under the rolling sleeve 52, one of the pressure plates 53 is against the shoulder of the rolling shaft 51, and the other pressure plate 53 is against the locking nut 54, so that the rolling sleeve 52 is limited to the rolling shaft 51. From the cross-sectional view, from left to right are the pressure plate 53, the rolling sleeve 52, the pressure plate 53, the locking nut 54, and the rolling shaft 51 passes through the above four connections; as shown in FIG. Figure 9 As shown, the outer wall profile of the rolling sleeve 52 has two first grooves 521, and a wave-shaped structure of a first protrusion 522 is formed between the two first grooves 521; curved outer molds 510 are symmetrically arranged on both sides of the radial outside of the rolling sleeve 52.

[0051] like Figure 12-14 As shown, the intermediate ring body is made by using the pre-bending mold in Example 2 as follows: Figure 12 As shown, first, the graphite paper strip is rolled into a hollow annular structure, and the graphite paper strip is placed outside the rolling sleeve 52. Two curved outer molds 510 are symmetrically arranged outside the rolling sleeve 52 and the curved outer mold 510 is installed at the protruding end of the machine tool. There is a certain gap between the two curved outer molds 510. Then, the two oppositely arranged curved outer molds 510 move radially inward until the two curved outer molds 510 contact. At this time, the annular graphite paper strip is compressed between the two curved outer molds 510 and the rolling sleeve 52. The first protrusion 522 cooperates with the third groove 511, and the third protrusion 512 cooperates with the first groove 521, thus forming a structure as shown in FIG. Figure 13 The middle ring body 02 has a wavy structure.

[0052] After the intermediate ring body 02 is formed, the steps are exactly the same as those for forming the ring body 01 in Example 1, that is, the intermediate ring body 02 is placed in the compression mold 6 and axially compressed to form the ring body 01.

[0053] Compared with the two-step method for forming the ring body in Example 1, the intermediate ring body 02 is formed during the winding process of the graphite paper tape, and then the intermediate ring body 02 is axially compressed to form the ring body 01.

[0054] Example 2 adopts a three-step method to form the ring body. That is, the graphite paper strip is first rolled into a ring structure, then placed on the pre-bending die 5 to form the intermediate ring body 02, and finally the intermediate ring body 02 is axially compressed to form the ring body 01.

[0055] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A multi-layer folded sealing packing ring, characterized in that: include: A bellows-shaped intermediate ring body is formed by circumferentially winding a flexible graphite paper strip. The cross section of the intermediate ring body formed after axial compression has horizontal and multi-layered folded sections, and the multi-layer folded sections are connected end to end by vertical sections.

2. The multi-layer folded sealing packing ring according to claim 1, characterized in that: The inner peripheral wall and the outer peripheral wall of the ring body are both circumferential surfaces.

3. A mold for manufacturing a multi-layer folded sealing packing ring, used for molding the multi-layer folded sealing packing ring according to any one of claims 1-2, characterized in that: include: A pre-bending die is suitable for radially pressing the flexible graphite paper strip to form an intermediate ring body, wherein the cross-sections of the inner and outer peripheral walls of the intermediate ring body are both wavy, and the wall thickness of the intermediate ring body is uniform; A compression mold is used to place the intermediate ring body therein and axially compress the intermediate ring body to form a ring body.

4. The mold for manufacturing a multi-layer folded sealing packing ring according to claim 3, characterized in that: The pre-bending mold comprises: Rolling shaft; A rolling sleeve is sleeved and locked on the rolling shaft, wherein the outer peripheral wall of the rolling sleeve has at least two first grooves in the circumferential direction, an annular first protrusion is arranged between the two first grooves, and the first grooves and the first protrusion form a wave-shaped structure; A knife handle is provided on one side of the rolling sleeve, and a wheel frame is hingedly connected to the end thereof; a rolling wheel rotatably disposed on the wheel frame, with at least two second protrusions on its outer peripheral wall, the second protrusions being adapted to the first grooves, a second groove being formed between the two second protrusions, and the second groove being adapted to the first protrusion; Also includes: The guide wheel is rotatably arranged on the wheel frame, and has a fourth protrusion on its outer peripheral wall in the circumferential direction, and the graphite paper tape is pressed between the fourth protrusion and the first protrusion.

5. The mold for manufacturing a multi-layer folded sealing packing ring according to claim 3, characterized in that: The pre-bending mold comprises: Rolling shaft; A rolling sleeve is sleeved and locked on the rolling shaft, wherein the outer peripheral wall of the rolling sleeve has at least two first grooves in the circumferential direction, an annular first protrusion is arranged between the two first grooves, and the first grooves and the first protrusion form a wave-shaped structure; Two curved outer molds are arranged radially outward from the rolling sleeve, the two curved outer molds are symmetrically arranged, the inner wall of the curved outer mold has at least two third protrusions of an arc structure, and a third groove of an arc structure is formed between the two third protrusions; The shape of the first groove matches that of the third protrusion, and the shape of the first protrusion matches that of the third groove.

6. A mold for manufacturing a multi-layer folded sealing packing ring according to claim 4 or 5, characterized in that: The rolling sleeve is an annular structure composed of at least two split arc-shaped parts.

7. A mold for manufacturing a multi-layer folded sealing packing ring according to claim 4 or 5, characterized in that: Two pressure plates are sleeved on the rolling shaft, and the rolling sleeve is arranged between the two pressure plates, wherein the outer side surface of one pressure plate is against the shoulder of the rolling shaft, and the outer side surface of the other pressure plate is against the locking nut sleeved on the rolling shaft, and the inner sides of the two pressure plates are buckled with the rolling sleeve.

8. The mold for manufacturing a multi-layer folded sealing packing ring according to claim 3, characterized in that: The compression mold comprises: A lower mold plate, the upper surface of which is detachably provided with an inner mold and an outer mold, wherein the inner mold and outer mold support members form an annular cavity for receiving the intermediate ring body; The top of the upper template is connected to the press, and the bottom of the upper template is provided with a lower pressure ring inserted into the annular cavity.

9. A method for manufacturing a multi-layer folded sealing packing ring, using the mold for manufacturing a multi-layer folded sealing packing ring according to any one of claims 3, 4, 6, 7, and 8, characterized in that: The steps include: S1: Press one end of the graphite paper strip tightly between the first protrusion and the fourth protrusion of the rolling sleeve; S2: Keeping the tool handle rotating circumferentially relative to the rolling sleeve, pressing the graphite paper strip between the rolling sleeve and the rolling wheel, and finally forming a wavy intermediate ring body; during the relative rotation, the tool handle moves radially outward relative to the rolling sleeve; S3: placing the intermediate ring body in the annular cavity of the compression mold, pressing down the upper mold plate, and axially compressing the intermediate ring body to form a ring body; S4: Raise the upper template and disassemble the compression mold to obtain a ring body.

10. A method for manufacturing a multi-layer folded sealing packing ring, using the mold for manufacturing a multi-layer folded sealing packing ring according to any one of claims 3, 5, 6, 7, and 8, characterized in that: The steps include: S1: winding the graphite paper tape into a straight cylindrical structure and sleeve it on the outside of the rolling sleeve; S2: placing the two curved outer molds radially outward from the rolling sleeve, with a certain gap between the two curved outer molds; S3: Move the two curved outer molds radially inward to compress the annular graphite paper strip between the curved outer mold and the rolling sleeve to form an intermediate ring body; S4: placing the intermediate ring body in the annular cavity of the compression mold, pressing down the upper mold plate, and axially compressing the intermediate ring body to form a ring body; S4: Raise the upper template and disassemble the compression mold to obtain a ring body.

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