A method of forming a rubber joint mortise

Abstract

The present application belongs to the field of valve sealing ring, and particularly relates to a rubber joint mortise and tenon forming method. The method comprises the following steps: chamfering the end face of the sealing strip, so that the end faces of the two sealing strips are buckled to be in a right angle shape; respectively digging blind hole grooves, filling raw rubber in the blind hole grooves, and coating raw rubber on the end face; buckling the end faces of the two sealing strips and placing them into a mold for vulcanization to complete the production and forming of the sealing strip joint. The present application adopts the form of opening blind hole grooves, and fills raw rubber in the blind hole grooves to form a mortise and tenon connection structure, so that the joint strength of the rubber sealing strip is improved, and compared with the traditional raw rubber filling amount, the raw rubber filling amount is reduced, thereby reducing the deformation caused by raw rubber vulcanization shrinkage, improving the flatness of the sealing ring, and improving the valve sealing effect.

Description

Technical Field

[0001] This invention belongs to the field of valve sealing rings, and specifically relates to a method for forming mortise and tenon joints for rubber joints. Background Technology

[0002] Currently, some models of sealing valves on the market use square valve plates. The valve stem rotates to drive the valve plate to rotate and press the sealing ring located on the valve seat to form a seal. In order to match the shape of the valve plate, the sealing ring also needs to be made into a square shape.

[0003] Because sealing rings come in different sizes, the traditional manufacturing method involves cutting a strip of sealing rubber, placing the joint ends of the two sealing strips flush in a mold, forming a square cavity at the right angle of the mold, filling the square cavity with raw rubber, covering the mold, and placing it on the platform of a vulcanizing machine for vulcanization.

[0004] Because raw rubber and varnished rubber have different shrinkage ratios, the sealing rings made by traditional joint vulcanization processes have inconsistent outlines at right angles. They are generally 0.3-1.5mm smaller in cross-sectional diameter than the varnished rubber portion, resulting in uneven sealing surfaces. Furthermore, this method uses more raw rubber and has a longer vulcanization time, which can easily lead to poor valve plate fit at the joint, resulting in excessive valve leakage and unstable sealing quality. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a method for forming mortise and tenon joints in rubber joints, which can reduce the amount of raw rubber used, reduce the deformation caused by the vulcanization shrinkage of raw rubber, improve the flatness of the sealing ring, and improve the sealing effect of the valve.

[0006] The specific technical solution adopted in this invention is as follows:

[0007] A method for forming mortise and tenon joints for rubber joints includes the following steps:

[0008] S1. Cut the end faces of the two sealing strips at a 45° angle so that when the end faces of the two sealing strips are fastened together, the two sealing strips are at right angles.

[0009] S2. Grooves are dug on the end faces of the two sealing strips to form blind hole grooves. The opening of the blind hole groove is located on the end face of the sealing strip. The blind hole grooves are connected after the two sealing strips are fastened together.

[0010] S3. The blind hole groove is filled with raw rubber and the end face is coated with raw rubber.

[0011] S4. Fasten the end faces of the two sealing strips together and place them into the mold for vulcanization to complete the forming of the sealing strip joint.

[0012] In step S2, the lateral width of the opening of the blind hole groove is smaller than the lateral width of the inner cavity of the blind hole groove.

[0013] In step S3, the blind hole groove is also filled with a tenon block. The shape of the tenon block is the same as the inner cavity shape of the blind hole groove after the end faces of the two sealing strips are engaged. The raw rubber is filled in the gap between the tenon block and the blind hole groove.

[0014] In step S2, the blind hole groove is completed by a grooving device. The grooving device includes a strip clamping plate and a grooving mechanism set on the base plate. The strip clamping plate is provided with a fixing groove for accommodating the sealing strip. The grooving mechanism includes a sliding seat that feeds toward the strip clamping plate and a grooving cutter holder set on the sliding seat. The grooving cutter holder is slidably connected to a horizontal slide rail set on the sliding seat. The horizontal slide rail is perpendicular to the feed direction of the sliding seat. A grooving cutter bar is fixedly connected to the grooving cutter bar. A contour groove fixed to the base plate is provided below the grooving cutter bar. A contour rod extending out of the grooving cutter bar is provided. The contour rod extends into the contour groove to form a limiting fit.

[0015] The sliding seat has the freedom to feed and retract relative to the strip clamping plate by means of a sliding cylinder. The strip clamping plate includes an upper clamping plate and a lower clamping plate. The fixing groove is provided on the lower clamping plate. The fixing groove is provided on the side opposite to the grooving mechanism for the grooving tool bar to extend into.

[0016] The contouring groove is an annular structure, including a forming part with an arc-shaped groove structure and a receiving part with a Y-shaped groove structure. The top of the forming part is provided with a reversing structure. The reversing structure includes a convex receiving part provided on the outer groove side of the forming part and a convex reversing cone provided on the inner groove side of the forming part. The reversing cone and the receiving part are offset along the feed direction of the grooving tool holder. The reversing cone is close to the feed side of the contouring rod.

[0017] The lower end of the Y-shaped retracting section is a closed end. A directional structure is provided at the intersection of the feed side and the retraction side of the retracting section. The directional structure is a funnel-shaped structure provided on the feed side of the retracting section.

[0018] The end of the grooving cutter bar is provided with a ring cutter, and the upper and lower sides of the end of the grooving cutter bar are respectively fixed plates with sheet-like structures. The ring cutter has an arc-shaped structure, and the two sides of the ring cutter are respectively hinged to the fixed plates on both sides. The inner arc side of the ring cutter and the side of the fixed plate are provided with cutting edges.

[0019] The end of the grooving bar is provided with two sets of plate-shaped fixing plates, and an electric heating wire is pulled between the free ends of the fixing plates. The side of the fixing plates is provided with a cutting edge.

[0020] The beneficial effects of this invention are:

[0021] This invention employs a blind hole groove and fills the groove with raw rubber to form a tenon-and-mortise connection structure. This improves the joint strength of the rubber sealing strip and reduces the amount of raw rubber required compared to traditional methods. This reduces the deformation caused by the shrinkage of the raw rubber during vulcanization, improves the flatness of the sealing ring, and enhances the valve sealing effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the joint structure after the sealing strips of the present invention are assembled;

[0023] Figure 2 This is a schematic diagram of the structure of a sealing strip connector in the prior art;

[0024] Figure 3 This is a schematic diagram of the grooving device.

[0025] Figure 4 A schematic diagram of the grooving device from a side view.

[0026] Figure 5 This is a schematic diagram of the structure when the contour groove and the contour rod are engaged, viewed from the side.

[0027] Figure 6 A schematic diagram of the contour groove from a top view.

[0028] Figure 7 This is an enlarged schematic diagram of the blind hole groove portion on the end face of the sealing strip;

[0029] Figure 8 This is a schematic diagram of the grooving tool bar when using a heating wire;

[0030] In the attached diagram, 1 is the sealing strip, 2 is the blind hole groove, 3 is the base plate, 4 is the strip clamping plate, 5 is the fixing groove, 6 is the sliding seat, 7 is the grooving knife holder, 8 is the horizontal slide rail, 9 is the grooving knife bar, 10 is the contour groove, 11 is the contour rod, 12 is the forming part, 13 is the retracting part, 14 is the receiving part, 15 is the reversing cone, 16 is the ring cutting knife, 17 is the fixing plate, 18 is the clamping cylinder, 19 is the sliding cylinder, 20 is the heating wire, 101 is the first petal, and 102 is the second petal. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0032] Specific implementation examples Figure 1 As shown, the present invention is a method for forming mortise and tenon joints for rubber joints, comprising the following steps:

[0033] S1. Cut the end faces of the two sealing strips 1 at a 45° angle so that when the end faces of the two sealing strips 1 are fastened together, the two sealing strips 1 are at right angles.

[0034] S2. Grooves are dug on the end faces of the two sealing strips 1 to form blind hole grooves 2. The opening of the blind hole groove 2 is located on the end face of the sealing strip 1. After the two sealing strips 1 are fastened together, the blind hole grooves 2 are connected.

[0035] S3. The blind hole groove 2 is filled with raw rubber, and the end face is coated with raw rubber;

[0036] S4. Fasten the end faces of the two sealing strips 1 together and place them into the mold for vulcanization to complete the forming of the sealing strip 1 joint.

[0037] This invention, by providing a blind groove 2 on the end face, avoids the raw rubber material surface from being directly exposed to the molten rubber side, thereby preventing significant shrinkage deformation at the joint of the rubber sealing strip 1. Furthermore, the 45° bevel cut combined with the blind groove 2, compared to... Figure 2 The traditional process shown reduces the amount of raw rubber used, resulting in less overall deformation after vulcanization, thereby reducing surface shrinkage and improving flatness and sealing performance.

[0038] Furthermore, such as Figure 1 As shown, in step S2, the lateral width of the opening of the blind hole groove 2 is smaller than the lateral width of the inner cavity of the blind hole groove 2.

[0039] In step S3, the blind hole groove 2 is also filled with a tenon block. The shape of the tenon block is the same as the inner cavity shape of the blind hole groove 2 after the end faces of the two sealing strips 1 are engaged. The raw rubber is filled in the gap between the tenon block and the blind hole groove 2.

[0040] By setting a large opening and a small closing within the blind hole groove 2, the raw rubber lumps, after vulcanization, form a mortise and tenon structure. This adds structural constraints to the existing raw rubber adhesive strength, improving the connection quality. Furthermore, by pre-making tenons using waste material from cutting the sealing strips, and then filling the tenons with raw rubber, the connection is further enhanced. Figure 1 As shown, the figure-eight shaped tenon serves to connect the tenon and mortise and the space of the blind hole groove 2 is squeezed out. Since the raw rubber surrounds the tenon and is close to the surface of the sealing strip 1, the temperature conduction during vulcanization is relatively easy. In addition, the amount of raw rubber is reduced and the vulcanization time is significantly shortened, thereby improving the forming efficiency of the joint.

[0041] Furthermore, in step S2, the blind hole groove 2 is completed using a grooving device, such as... Figure 3As shown, the grooving device includes a strip clamping plate 4 and a grooving mechanism mounted on a base plate 3. The strip clamping plate 4 is provided with a fixing groove 5 for accommodating the sealing strip 1. The grooving mechanism includes a sliding seat 6 that feeds toward the strip clamping plate 4 and a grooving cutter holder 7 mounted on the sliding seat 6. The grooving cutter holder 7 is slidably connected to a horizontal slide rail 8 mounted on the sliding seat 6. The horizontal slide rail 8 is perpendicular to the feeding direction of the sliding seat 6. A grooving cutter bar 9 is fixedly connected to the grooving cutter holder 7. A contour groove 10 fixed to the base plate 3 is provided below the grooving cutter bar 9. A contour rod 11 extends out of the grooving cutter bar 9 and extends into the contour groove 10 to form a limiting fit.

[0042] Two sets of grooving tool holders 7 and horizontal slide rails 8 are provided, and the contour groove is fixed between the two sets of grooving tool holders 7 and horizontal slide rails 8, thereby avoiding the shaking of the grooving tool holders 7 and grooving tool rods 9.

[0043] like Figure 3 As shown, when in use, the cut sealing strip 1 is placed into the strip clamp 4. The main vertical cross-section of the sealing strip 1 is rectangular. The grooving tool 9 moves to carve on the end face of the sealing strip 1, and the blind hole groove 2 of the required shape is formed by the contouring rod 11 moving along the contouring groove 10. This improves the efficiency of joint prefabrication and ensures that the shape of the blind hole groove 2 is fixed, making it easy to adapt and make tenons.

[0044] Furthermore, the sliding seat 6 has the freedom to feed and retract relative to the strip clamping plate 4 by means of the sliding cylinder 19. The strip clamping plate 4 includes an upper clamping plate and a lower clamping plate. The fixing groove 5 is provided on the lower clamping plate. The fixing groove 5 is provided on the side opposite to the grooving mechanism for the grooving cutter bar 9 to extend into.

[0045] The sliding cylinder 19 pushes the sliding seat 6 to move back and forth along the guide rail set on the base plate 3, forming the freedom of feeding and retraction. The strip clamping plate 4 is a split structure with upper and lower parts. The lower clamping plate is provided with a fixing groove 5 that matches the shape of the sealing strip 1. The upper clamping plate is pushed down by the clamping cylinder 18 to clamp the sealing strip 1, so as to prevent the sealing strip 1 from moving when digging the blind hole groove 2.

[0046] like Figure 3 and Figure 6 As shown, the contouring groove 10 is an annular structure, including a forming part 12 with an arc-shaped groove structure and a receiving part 13 with a Y-shaped groove structure. The top of the forming part 12 is provided with a reversing structure. The reversing structure includes a convex receiving part 14 provided on the outer groove side of the forming part 12 and a convex reversing cone 15 provided on the inner groove side of the forming part 12. The reversing cone 15 and the receiving part 14 are offset along the feed direction of the grooving cutter holder 7. The reversing cone 15 is close to the feed side of the contouring rod 11.

[0047] The lower end of the Y-shaped retracting section 13 is a closed end. A directional structure is provided at the intersection of the feed side and the retraction side of the retracting section 13. The directional structure is a funnel-shaped structure provided on the feed side of the retracting section 13.

[0048] The width of the forming part 12 is greater than the width of the retracting part 13. The connection between the retracting part 13 and the forming part 12 consists of two sets of vertical straight grooves. The forming part 12 is arc-shaped. During the feeding process, when the contour rod 11 of the grooving bar 9 is located in the straight groove, it is inserted into the end face of the sealing strip 1. Then the contour rod 11 enters the forming part 12.

[0049] In the feeding state, the sliding cylinder 19 extends to push the sliding seat 6 forward, and the contour rod 11 moves along the contour groove 10. Since the grooving bar 9 cooperates with the horizontal slide rail 8 on the sliding seat 6 through the grooving bar seat 7, the shape of the contour groove 10 allows the grooving bar 9 to move left and right at the same time during the forward movement of the grooving bar 9, thereby forming the blind hole groove 2 of the required shape.

[0050] When it reaches such Figure 6 When the top of the forming part 12 reaches the receiving part 14, the contour rod 11 drives the grooving cutter bar 9 to enter the receiving part 14 from the left. Then, after the contour rod 11 enters the receiving part 14, the sliding cylinder 19 retracts, entering a retracting state. The contour rod 11 retracts along with the grooving cutter bar 9. Because the contour rod 11 has a circular cylindrical structure and the reversing cone 15 is misaligned with the receiving part 14, the contour rod 11 can enter the receiving part 14 under the guidance of the reversing cone 15. Figure 6 On the right side of the contouring groove 10, after the contouring rod 11 enters the retracting section 13, the Y-shaped structure of the retracting section 13 allows the contouring rod 11 to smoothly enter the closed end of the retracting section 13 and achieve reset. When the next feed state occurs, as the sliding cylinder 19 pushes the sliding seat 6 forward, the trumpet-shaped structure on the feed side of the retracting section 13 ensures that the contouring rod 11 smoothly feeds along the feed side.

[0051] Furthermore, such as Figure 4 As shown, the end of the grooving bar 9 is provided with a ring cutter 16, and the upper and lower sides of the end of the grooving bar 9 are respectively fixed plates 17 with sheet-like structures. The ring cutter 16 has an arc-shaped structure, and the two sides of the ring cutter 16 are respectively hinged to the fixed plates 17 on both sides. The inner arc side of the ring cutter 16 and the side of the fixed plate 17 are provided with cutting edges.

[0052] The circumferential cutting blade 16 is hinged to the fixed plate 17, allowing the circumferential cutting blade 16 to swing relative to the fixed plate 17. Figure 4As shown, the contact between the ring cutter 16 and the end face of the sealing strip 1 occurs in the straight groove section. If the back of the ring cutter 16 contacts the sealing strip 1, the ring cutter 16 swings, causing the side of the ring cutter 16 to face the end face of the sealing strip 1. Figure 4 As shown, since the ring cutter 16 is arc-shaped and its two ends are hinged to the fixing plate 17, after the fixing plate 17 is inserted into the sealing strip 1, the end of the ring cutter 16 is squeezed into the sealing strip 1. With the reverse pushing action of the sealing strip 1, the ring cutter 16 is pushed so that the blade faces the sealing strip 1, thus starting to cut.

[0053] Since the molding part 12 has an arc-shaped structure, the hinged ring cutter 16 can ensure that the blade always follows the moving direction of the fixed piece 17, achieving arc-shaped cutting and reducing cutting resistance. At the hinge point between the ring cutter 16 and the fixed piece 17, since there is no blade, the sealing strip 1 is torn open to form a rough edge, which improves the bonding strength between the raw rubber and the cured rubber at this corner, further strengthening the bonding strength after vulcanization and avoiding cracking during later use.

[0054] Alternatively, the end of the grooving bar 9 is provided with two sets of sheet-like fixing plates 17, with heating wires 20 pulled between the free ends of the fixing plates 17, and a cutting edge is provided on the side of the fixing plates 17.

[0055] like Figure 8 As shown, in this embodiment, the inner wall of the blind hole groove is excavated by heating and melting the sealing strip with the heating wire 20. The upper and lower sides of the blind hole groove are still cut off by the cutting edge of the fixing plate 17. This method has low excavation resistance, is easy to maintain, and does not have the problem of repeated disassembly and grinding of the ring cutting blade 16.

[0056] After the narrower blind hole groove "mouth" is cut, the fixing piece 17 moves laterally to cut the forming part 12, and the side walls on both sides of the blind hole groove "mouth" are cut, such as... Figure 7 As shown, the first petal 101 and the second petal 102 that form the cantilever structure, after the cutting is completed, the remaining material cut out inside is pulled out from the "mouth". Since the first petal 101 and the second petal 102 have been cut off from the sealing strip 1, when the remaining material is pulled out, it plays the role of expanding the "mouth" of the blind hole groove, which makes it easier to pull out the remaining material, and also makes it easier to insert the "tenon" later.

Claims

1. A method for forming mortise and tenon joints in rubber joints, characterized in that: Includes the following steps, S1. Cut the end faces of the two sealing strips (1) obliquely at 45° so that the two sealing strips (1) are right-angled after the end faces of the two sealing strips (1) are fastened together. S2. Drill grooves on the end faces of the two sealing strips (1) to form blind hole grooves (2). The opening of the blind hole groove (2) is located on the end face of the sealing strip (1). After the two sealing strips (1) are fastened together, the blind hole grooves (2) are connected. S3. The blind hole groove (2) is filled with raw rubber and coated with raw rubber on the end face; S4. Fasten the end faces of the two sealing strips (1) together and place them into the mold for vulcanization to complete the forming of the sealing strip (1) joint; In step S3, the blind hole groove (2) is also filled with tenons. The shape of the tenons is the same as the inner cavity shape of the blind hole groove (2) that is connected after the end faces of the two sealing strips (1) are engaged. The raw rubber is filled in the gap between the tenons and the blind hole groove (2). In step S2, the blind hole groove (2) is completed by means of a grooving device. The grooving device includes a strip clamping plate (4) set on the base plate (3) and a grooving mechanism. The strip clamping plate (4) is provided with a fixing groove (5) for accommodating the sealing strip (1). The grooving mechanism includes a sliding seat (6) that feeds toward the strip clamping plate (4) and a grooving knife holder (7) set on the sliding seat (6). The grooving knife holder (7) is slidably connected to a horizontal slide rail (8) set on the sliding seat (6). The horizontal slide rail (8) is perpendicular to the feeding direction of the sliding seat (6). A grooving knife bar (9) is fixedly connected to the grooving knife holder (7). A contour groove (10) fixed to the base plate (3) is provided below the grooving knife bar (9). A protruding contour rod (11) is provided on the grooving knife bar (9). The contour rod (11) extends into the contour groove (10) to form a limiting fit. The contouring groove (10) is an annular structure, including a forming part (12) with an arc-shaped groove structure and a receiving part (13) with a Y-shaped groove structure. The top of the forming part (12) is provided with a reversing structure. The reversing structure includes a receiving part (14) with a protrusion on the outer groove side of the forming part (12) and a reversing cone (15) with a protrusion on the inner groove side of the forming part (12). The reversing cone (15) and the receiving part (14) are offset along the feed direction of the grooving cutter holder (7). The reversing cone (15) is close to the feed side of the contouring rod (11).

2. The method for forming a rubber joint mortise and tenon joint according to claim 1, characterized in that: In step S2, the lateral width of the opening of the blind hole groove (2) is smaller than the lateral width of the inner cavity of the blind hole groove (2).

3. The method for forming a rubber joint mortise and tenon joint according to claim 1, characterized in that: The end of the grooving bar (9) is provided with a ring cutter (16), and the upper and lower sides of the end of the grooving bar (9) are respectively fixed plates (17) with sheet-like structures. The ring cutter (16) has an arc-shaped structure. The two sides of the ring cutter (16) are respectively hinged to the fixed plates (17) on both sides. The inner arc side of the ring cutter (16) and the side of the fixed plate (17) are provided with cutting edges.

4. The method for forming a rubber joint mortise and tenon joint according to claim 1, characterized in that: The end of the grooving bar (9) is provided with two sets of sheet-like fixing plates (17), and heating wires (20) are pulled between the free ends of the fixing plates (17). The side of the fixing plates (17) is provided with a cutting edge.

5. The method for forming a rubber joint mortise and tenon joint according to claim 1, characterized in that: The sliding seat (6) has the freedom to feed and retract relative to the strip clamp (4) by means of the sliding cylinder (19). The strip clamp (4) includes an upper clamp and a lower clamp. The fixing groove (5) is set on the lower clamp. The fixing groove (5) is provided with a notch on the side opposite to the grooving mechanism for the grooving cutter bar (9) to extend into.

6. The method for forming a rubber joint mortise and tenon joint according to claim 1, characterized in that: The lower end of the Y-shaped retracting part (13) is a closed end. A directional structure is provided at the intersection of the feed side and the retraction side of the retracting part (13). The directional structure is a trumpet-shaped structure provided on the feed side of the retracting part (13).

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