Special honing fixture for finishing inner hole of round pipe joint

Abstract

This invention relates to the field of round pipe joint processing technology, specifically to a special honing fixture for precision machining of the inner hole of round pipe joints. It includes a housing, with an upper shell fixed inside the upper end of the housing. An inlet pipe is fixedly connected to one side of the upper shell. Multiple fixed sleeves are evenly distributed and fixedly connected to the lower end of the upper shell. An inner rod is concentrically inserted into each fixed sleeve. Multiple collars are sequentially fitted around the outer side of the inner rod. The outermost collar's outer edge slides in contact with the inner edge of the fixed sleeve. The lower ends of the other collars and the lower ends of the inner rods are machined with upsetting sections. The inner sides of the lower ends of the collars are chamfered to accommodate the adjacent upsetting sections. The inner rod is fixed inside the upper shell. A material-retrieving seat is slidably arranged vertically inside the housing. The upper end of the material-retrieving seat is connected to the lower end of the upper shell via multiple second hydraulic rods. The material-retrieving seat has a through hole concentric with the fixed sleeves, and a clamping assembly is installed inside the material-retrieving seat. This invention achieves dynamic adaptation to different pipe diameters through a nested collar assembly and a linkage structure between the upsetting section and the chamfer.

Description

Technical Field

[0001] This invention relates to the field of round pipe joint processing technology, specifically to a special honing fixture for precision machining of the inner hole of a round pipe joint. Background Technology

[0002] In the field of mechanical manufacturing, round pipe fittings are key connecting components in fluid transport systems, and the surface roughness and geometric accuracy of their inner bore directly affect their sealing performance and service life. Currently, honing is widely used in industry to finish the inner bore of pipe fittings, eliminating microscopic unevenness and shape errors left by previous processes. Conventional honing heads are usually of a single fixed size, requiring frequent tool changes or equipment parameter adjustments when machining fittings of different diameters, leading to production interruptions and extended changeover times. For round pipe fittings with stepped bores, multi-section diameter changes, or thin walls, traditional honing tools struggle to achieve dynamic adaptation. For example, when the honing head enters the diameter change region, the rigid structure cannot adapt to changes in the inner bore contour, easily causing tool jamming or pipe wall deformation; while segmented machining strategies require repeated positioning, increasing the risk of coaxiality errors. Summary of the Invention

[0003] The main objective of this invention is to provide a fixture suitable for honing the inner bore of round pipe fittings of different diameters.

[0004] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0005] A specialized honing fixture for precision machining of the inner bore of round pipe joints includes a housing with an opening at the front. An upper shell is fixedly installed inside the upper part of the housing, and an inlet pipe is fixedly connected to one side of the upper shell. Multiple fixed sleeves are evenly distributed and fixedly connected to the lower end of the upper shell. An inner rod is concentrically inserted into each fixed sleeve. Multiple collars are sequentially fitted around the outer side of the inner rod. The outermost collar's outer edge slides in contact with the inner edge of the fixed sleeve. The lower ends of the other collars and the lower ends of the inner rods are machined with upsetting sections. The inner sides of the lower ends of the collars are chamfered to accommodate the adjacent upsetting sections. When the inner collar moves upward, it can drive the outer collars upward. The inner edge of the innermost collar slides in contact with the outer edge of the inner rod. The inner rod is fixed. Inside the upper shell, a material-grabbing seat is slidably mounted vertically within the housing. The material-grabbing seat is located below the upper shell, and its upper end is connected to the lower end of the upper shell via multiple second hydraulic rods. The material-grabbing seat has a through hole concentric with the fixed sleeve. A clamping assembly is installed inside the material-grabbing seat. After the material tube passes through the through hole, the clamping assembly can clamp the material tube. Inside the housing, a lower shell is slidably mounted vertically. The lower end of the lower shell is connected to the lower end of the housing via a first hydraulic rod. The lower shell is located below the material-grabbing seat. A through hole corresponding to the through hole is opened at the upper end of the lower shell, and an outlet tube is fixedly connected to one side of the lower shell. The housing also includes a tray, with an insertion tube corresponding to the through hole fixed at the upper end of the tray. The lower end of the material tube is inserted into the insertion tube.

[0006] Specifically, a fixing rod is concentrically fixed to the upper end of the inner rod, and the fixing rod is fixed inside the upper shell.

[0007] Specifically, the material handling seat has an inner cavity with perforations passing through it. A clamping assembly is located within the inner cavity and includes multiple clamping units, the number of which is equal to and corresponds one-to-one with the number of perforations. Each clamping unit includes two first sliding grooves located at the bottom of the inner cavity. The two first sliding grooves are symmetrical about the axis of the perforations. A first clamping block and a second clamping block are slidably disposed in the two first sliding grooves, respectively. One end of a first connecting rod is rotatably connected to the first clamping block, and one end of a second connecting rod is rotatably connected to one end of the second clamping block. The other ends of the first and second connecting rods are rotatably connected to a slider. The bottom of the inner cavity has multiple second sliding grooves located inside the perforations. The number of second sliding grooves is equal to and corresponds one-to-one with the number of perforations. The length direction of the second sliding groove is perpendicular to the length direction of the first sliding groove. The slider is slidably engaged in the second sliding groove. A driving unit capable of simultaneously driving the slider to slide within the second sliding groove is provided in the inner cavity.

[0008] Specifically, the drive unit includes a turntable, which is concentrically rotated in the inner cavity. A hydraulic motor is fixed at the upper end of the material picker, and the output shaft of the hydraulic motor is concentrically fixedly connected to the turntable. Multiple arc-shaped grooves are opened on the turntable, and the multiple arc-shaped grooves are evenly distributed according to the circumference of the turntable's axis. One end of the arc-shaped groove is deflected towards the center of the turntable, and the slider passes through the corresponding arc-shaped groove and slides in the corresponding second groove.

[0009] Specifically, the opposite end faces of the first and second clamping blocks are both machined with inverted V-shaped grooves.

[0010] Specifically, the collar is made of a wear-resistant alloy material.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. Through the nested collar assembly and the linkage structure of the upsetting section and chamfering, dynamic adaptation to different pipe diameters is achieved. When the material pipe moves upward and pushes a specific collar, the outer collar rises synchronously, and the inner collar and inner rod automatically enter the material pipe to form a grinding channel that matches the pipe diameter. There is no need to change tools or adjust parameters, and it can seamlessly accommodate material pipes of different diameters, significantly improving the flexibility of the production line.

[0013] 2. The turntable is driven to rotate by a hydraulic motor, causing all the sliders to move along the second groove, which in turn drives the first and second clamping blocks to close precisely. This structure enables multiple tubes to be locked simultaneously, eliminating the time-consuming operation of each tube in traditional clamps. In addition, the inverted V-shaped groove ensures that the tubes are self-centering axially, avoiding the risk of vibration and displacement.

[0014] 3. The stepped flow channel formed by the misalignment of the collars. That is, the gap between the fixed rod and the fourth collar, and the fifth collar and the material tube annular cavity. Compressed air generates turbulence in the variable cross-section channel to enhance the kinetic energy of the grinding particles, solving the problem of deposition dead angle in traditional unidirectional flow channels and achieving consistent micro-cutting along the entire pipe length. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the fixture.

[0016] Figure 2 This is a sectional view of the fixture.

[0017] Figure 3 A schematic diagram showing the fitting of two adjacent collars.

[0018] Figure 4 This is a diagram showing the positional relationship between the perforation, the first slide, and the second slide.

[0019] Figure 5 This is a schematic diagram of the clamping assembly.

[0020] Figure 6 This is a schematic diagram showing the first and second clamping blocks holding the material tube.

[0021] Figure 7 This is a schematic diagram of machining the inner hole of the feed tube.

[0022] The components in the attached diagram are named as follows: 1. Housing; 2. Upper shell; 201. Fixing sleeve; 3. Collar; 301. Upsetting section; 302. Inner rod; 4. Material pick-up seat; 401. Through hole; 5. Lower shell; 501. Through hole; 6. Tray; 601. Insert tube; 7. Material tube; 8. First hydraulic rod; 9. Hydraulic motor; 10. Second hydraulic rod; 11. Fixing rod; 12. First slide groove; 13. Second slide groove; 14. First clamping block; 15. Second clamping block; 16. First connecting rod; 17. Second connecting rod; 18. Slider; 19. Turntable; 20. Arc groove. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] like Figures 1-7 As shown, a special honing fixture for precision machining of the inner hole of a round pipe joint includes a housing 1 with an opening on the front side. An upper shell 2 is fixed inside the upper end of the housing 1, and an inlet pipe is fixedly connected to one side of the upper shell 2.

[0025] Multiple fixed sleeves 201 are evenly distributed and fixedly connected to the lower circumference of the upper shell 2, and an inner rod 302 is concentrically inserted into the fixed sleeve 201.

[0026] Multiple collars 3 are sequentially fitted on the outer side of the inner rod 302. The collars 3 are made of wear-resistant alloy material. The outermost collar 3 has its outer edge in sliding contact with the inner edge of the fixed sleeve 201. The lower ends of the other collars 3 and the lower end of the inner rod 302 are all machined with upsetting sections 301. The inner side of the lower end of the collars 3 is machined with a chamfer. The chamfer is used to accommodate the inner and adjacent upsetting sections 301. When the inner collar 3 moves upward, it can drive the outer collar 3 to move upward.

[0027] The innermost collar 3 has its inner edge in sliding contact with the outer edge of the inner rod 302, which is fixed inside the upper shell 2. Specifically, a fixing rod 11 is concentrically fixed to the upper end of the inner rod 302, and the fixing rod 11 is fixed inside the upper shell 2.

[0028] like Figure 2 As shown, in this embodiment, the number of inner rings 3 of the fixed sleeve 201 is 6. For ease of description, the rings 3 from the outside to the inside are named the first set, the second set, the third set, the fourth set, the fifth set, and the sixth set. Among them, the lower ends of the second set, the third set, the fourth set, the fifth set, the sixth set, and the inner rod 302 are all machined with upsetting sections 301. The inner sides of the lower ends of the first set, the second set, the third set, the fourth set, the fifth set, and the sixth set are all machined with chamfers. The upsetting section 301 at the lower end of the second set is located within the chamfer at the lower end of the first set, the third set, the fourth set, the fifth set, and the inner rod 302. Therefore, as the sixth set moves upward, the first, second, third, fourth, and fifth sets move upward simultaneously.

[0029] like Figure 7 As shown, when the upper end of the material tube 7 pushes the fourth set upward, the first set, the second set and the third set move upward accordingly, and the inner rod 302, the fifth set and the sixth set will enter the material tube 7.

[0030] A material picking seat 4 is slidably arranged in the vertical direction inside the housing 1. The material picking seat 4 is located below the upper shell 2. The upper end of the material picking seat 4 is connected to the lower end of the upper shell 2 through multiple second hydraulic rods 10. A through hole 401 concentric with the fixed sleeve 201 is opened on the material picking seat 4. A clamping component is provided inside the material picking seat 4. After the material tube 7 passes through the through hole 401, the clamping component can clamp the material tube 7.

[0031] A lower shell 5 is slidably installed in the vertical direction inside the box 1. The lower end of the lower shell 5 is connected to the lower end of the box 1 through the first hydraulic rod 8. The lower shell 5 is located below the material receiving seat 4. A through hole 501 corresponding to the through hole 401 is opened at the upper end of the lower shell 5. An outlet pipe is fixedly connected to one side of the lower shell 5.

[0032] The material handling seat 4 has an inner cavity, and the through hole 401 passes through the inner cavity. The clamping assembly is located in the inner cavity. The clamping assembly includes multiple clamping units, and the number of clamping units is equal to the number of through holes 401 and corresponds one-to-one.

[0033] The clamping unit includes two first sliding grooves 12 formed at the bottom of the inner cavity. The two first sliding grooves 12 are symmetrical about the axis of the through hole 401. A first clamping block 14 and a second clamping block 15 are slidably arranged in the two first sliding grooves 12 respectively. The opposite end faces of the first clamping block 14 and the second clamping block 15 are all machined with inverted V-shaped grooves.

[0034] One end of the first connecting rod 16 is rotatably connected to the first clamping block 14, one end of the second connecting rod 17 is rotatably connected to one end of the second clamping block 15, and the other ends of the first connecting rod 16 and the second connecting rod 17 are rotatably connected to the slider 18. The bottom of the inner cavity is provided with a plurality of second sliding grooves 13, which are located inside a plurality of through holes 401. The number of second sliding grooves 13 is equal to the number of through holes 401 and corresponds one-to-one. The length direction of the second sliding groove 13 is perpendicular to the length direction of the first sliding groove 12. The slider 18 is slidably engaged in the second sliding groove 13. The inner cavity is provided with a driving unit that can simultaneously drive the slider 18 to slide in the second sliding groove 13.

[0035] The drive unit includes a turntable 19, which is concentrically rotated in the inner cavity. A hydraulic motor 9 is fixed at the upper end of the material picker 4. The output shaft of the hydraulic motor 9 is concentrically fixedly connected to the turntable 19. Multiple arc-shaped grooves 20 are opened on the turntable 19. The multiple arc-shaped grooves 20 are evenly distributed around the circumference of the axis of the turntable 19. One end of the arc-shaped groove 20 is deflected toward the center of the turntable 19. The slider 18 passes through the corresponding arc-shaped groove 20 and slides in the corresponding second slide groove 13.

[0036] When the hydraulic motor 9 drives the turntable 19 to rotate, the slider 18 slides within the second slide groove 13 under the guidance of the arc groove 20. Multiple sliders 18 move simultaneously, and the first connecting rod 16 and the second connecting rod 17 drive the first clamping block 14 and the second clamping block 15 to slide within the two first slide grooves 12 respectively. When the slider 18 approaches the center of the turntable 19, the first clamping block 14 and the second clamping block 15 move closer together, thus clamping the material tube 7 passing through the through hole 401; conversely, the first clamping block 14 and the second clamping block 15 move further apart.

[0037] It also includes a tray 6, with an insert 601 corresponding to the perforation 401 fixed at the upper end of the tray 6, and the lower end of the material tube 7 inserted into the insert 601.

[0038] When the inner hole of the material tube 7 needs to be machined, the material tube 7 is inserted into the insertion tube 601 respectively. Then, the tray 6, the insertion tube 601 and the material tube 7 are placed on the upper end of the lower shell 5, so that the material tube 7 corresponds one-to-one with the perforation 401.

[0039] Simultaneously, multiple second hydraulic rods 10 are activated, and the material take-up seat 4 descends. After the material tube 7 passes through the through hole 401, the hydraulic motor 9 is activated. The hydraulic motor 9 drives the turntable 19 to rotate. During the rotation of the turntable 19, under the guidance of the arc groove 20 on the slider 18, the slider 18 slides in the second slide groove 13 and approaches the center of the turntable 19. The first connecting rod 16 and the second connecting rod 17 respectively drive the first clamping block 14 and the second clamping block 15 to move. The first clamping block 14 and the second clamping block 15 approach each other. After the first clamping block 14 and the second clamping block 15 clamp the material tube 7, the hydraulic motor 9 is turned off.

[0040] Then, multiple second hydraulic rods 10 are activated simultaneously. The second hydraulic rods 10 drive the material taking seat 4 and multiple material tubes 7 to move upward. After the material tubes 7 move upward, their lower ends exit from the insertion tube 601. Then, the tray 6 and the insertion tube 601 are taken out from the box 1.

[0041] like Figure 7 As shown, during the upward movement of the material tube 7, the upper end of the material tube 7 pushes the fourth set upward, and the third set, the second set and the first set move upward accordingly. The inner rod 302, the fifth set and the sixth set enter the material tube 7.

[0042] When the fourth and fifth sets are misaligned, a grinding material flow channel is formed between the fixing rod 11 and the fourth set, and between the fifth set and the material tube 7.

[0043] Then, the first hydraulic rod 8 is activated, causing the lower shell 5 to move upward. After moving upward, the lower shell 5 contacts the lower end of the feed tube 7, and the lower end of the feed tube 7 is connected to the through hole 501. At this time, the abrasive material flow channel connects the upper shell 2 and the lower shell 5.

[0044] This allows compressed air carrying abrasive material to enter the upper shell 2 through the inlet pipe. The compressed air carrying abrasive material flows through the abrasive material flow channel and then enters the lower shell 5 through the through hole 501.

[0045] When compressed air carrying abrasive material flows between the feed pipe 7 and the fifth set, the abrasive material can polish the inner hole of the feed pipe 7. The compressed air and abrasive material that have entered the lower shell 5 are discharged from the outlet pipe.

[0046] When the feed tube 7 moves upward and pushes the specific collar 3, the outer collar 3 rises synchronously, and the inner collar 3 and inner rod 302 automatically enter the feed tube 7 to form a grinding channel that matches the diameter of the feed tube 7. Without changing tools or adjusting parameters, it can seamlessly accommodate feed tubes 7 of different diameters, significantly improving the flexibility of the production line.

[0047] In this embodiment, as Figure 7 As shown, the bottom roughening section 301 of the fifth set will cause the inner wall of the lower end of the material pipe 7 to be excessively polished. After the material pipe 7 is processed, the excessively polished part of the lower end of the material pipe 7 can be cut off to proceed to the next step of installation.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A special honing fixture for precision machining of the inner hole of a round pipe joint, comprising a housing (1), the front of the housing (1) being open, an upper shell (2) being fixedly fixed inside the upper end of the housing (1), an inlet pipe being fixedly connected to one side of the upper shell (2), and a plurality of fixed sleeves (201) being evenly distributed and fixedly connected to the lower end of the upper shell (2), characterized in that, An inner rod (302) is concentrically inserted into a fixed sleeve (201). Multiple collars (3) are sequentially sleeved on the outer side of the inner rod (302). The outermost collar (3) has its outer edge sliding contact with the inner edge of the fixed sleeve (201). The lower ends of the other collars (3) and the lower ends of the inner rod (302) are all machined with upsetting sections (301). The inner side of the lower end of the collars (3) is machined with a chamfer. The chamfer is used to accommodate the inner and adjacent upsetting sections (301). When the inner collar (3) moves upward, it can drive the outer collar (3) to move upward. The inner edge of the innermost collar (3) slides in contact with the outer edge of the inner rod (302). The inner rod (302) is fixed inside the upper shell (2). A material picking seat (4) is slidably arranged in the vertical direction inside the box (1). The material picking seat (4) is located below the upper shell (2). The upper end of the material picking seat (4) is connected to the upper shell (2). 2) The lower end is connected by multiple second hydraulic rods (10). The material taking seat (4) has a through hole (401) concentric with the fixed sleeve (201). The material taking seat (4) is equipped with a clamping component. After the material tube (7) passes through the through hole (401), the clamping component can clamp the material tube (7). The lower shell (5) is slidably arranged in the vertical direction inside the box (1). The lower end of the lower shell (5) is connected to the lower end of the box (1) through the first hydraulic rod (8). The lower shell (5) is located below the material taking seat (4). The upper end of the lower shell (5) has a through hole (501) corresponding to the through hole (401). The lower shell (5) is fixedly connected to an outlet pipe on one side. It also includes a tray (6). The upper end of the tray (6) is fixed with an insertion tube (601) corresponding to the through hole (401). The lower end of the material tube (7) is inserted into the insertion tube (601).

2. The special honing fixture for precision machining of the inner hole of a round pipe joint according to claim 1, characterized in that, The upper end of the inner rod (302) is concentrically fixed with a fixing rod (11), which is fixed inside the upper shell (2).

3. The special honing fixture for precision machining of the inner hole of a round pipe joint according to claim 1, characterized in that, The material handling seat (4) has an inner cavity, through which a perforation (401) passes. The clamping assembly is located in the inner cavity. The clamping assembly includes multiple clamping units, the number of which is equal to and corresponds one-to-one with the number of perforations (401). Each clamping unit includes two first sliding grooves (12) at the bottom of the inner cavity. The two first sliding grooves (12) are symmetrical about the axis of the perforation (401). A first clamping block (14) and a second clamping block (15) are slidably arranged in the two first sliding grooves (12). One end of a first connecting rod (16) is rotatably connected to the first clamping block (14), and one end of a second connecting rod (17) is connected to the second clamping block (15). One end of the first connecting rod (16) is rotatably connected to the other end of the first connecting rod (16) and the other end of the second connecting rod (17) are rotatably connected to the slider (18). The bottom of the inner cavity is provided with multiple second sliding grooves (13). The multiple second sliding grooves (13) are located inside multiple perforations (401). The number of second sliding grooves (13) is equal to the number of perforations (401) and corresponds one-to-one. The length direction of the second sliding groove (13) is perpendicular to the length direction of the first sliding groove (12). The slider (18) is slidably engaged in the second sliding groove (13). The inner cavity is provided with a driving unit that can simultaneously drive the slider (18) to slide in the second sliding groove (13).

4. The special honing fixture for precision machining of the inner hole of a round pipe joint according to claim 3, characterized in that, The drive unit includes a turntable (19), which is concentrically rotated in the inner cavity. A hydraulic motor (9) is fixed at the upper end of the material picker (4). The output shaft of the hydraulic motor (9) is concentrically fixedly connected to the turntable (19). Multiple arc-shaped grooves (20) are opened on the turntable (19). The multiple arc-shaped grooves (20) are evenly distributed according to the circumference of the axis of the turntable (19). One end of the arc-shaped groove (20) deflects toward the center of the turntable (19). The slider (18) passes through the corresponding arc-shaped groove (20) and slides in the corresponding second slide groove (13).

5. The special honing fixture for precision machining of the inner hole of a round pipe joint according to claim 3, characterized in that, The opposite end faces of the first clamping block (14) and the second clamping block (15) are both machined with inverted V-shaped grooves.

6. The special honing fixture for precision machining of the inner hole of a round pipe joint according to claim 1, characterized in that, The collar (3) is made of wear-resistant alloy material.

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