A rotary clamping fixture for three-way multi-channel machining

Abstract

This invention relates to a rotary clamping fixture for multi-stage machining of three-way joints, comprising a transverse drive shaft, a rotary seat with a regular hexagonal cross-section fixedly fitted onto the drive shaft, rectangular fixed clamps formed on the lower part of the outer walls of each side of the rotary seat, and T-shaped lower three-way clamping openings formed on the fixed clamps; movable clamps opposite to the fixed clamps are respectively provided on the outer walls of each side of the rotary seat; circular recesses are formed in the middle of the end faces of both sides of the rotary seat, and opening components opposite to the front and lower front movable clamps of the rotary seat are inserted into the recesses, the opening components being fitted onto the drive shaft. This rotary clamping fixture has multiple clamping heads, and by rotating the three-way workpiece through the clamping heads, the workpiece can be switched between multiple machining stations, allowing multiple workpieces to be processed simultaneously, while eliminating the need for repeated clamping of the same workpiece, thus improving machining efficiency.

Description

Technical fields:

[0001] This invention relates to the technical field of tee machining fixtures, and more specifically to a rotary clamping fixture for multi-pass tee machining. Background technology:

[0002] Tee fittings are a basic pipeline connector widely used in various industries. The machining process of tee fittings generally requires the use of a lathe. For example, the machining of the inner holes at the three ends of a tee fitting involves cutting and reaming. Currently, tee fittings are typically clamped on a fixture with a T-slot, and the inner holes are machined by feeding a boring bar. Because a tee fitting has three ports, completing all the reaming work on the same tee fitting requires repeatedly clamping and changing the position of the tee fitting on the fixture. Therefore, completing the machining of a single tee fitting is time-consuming and inefficient. Therefore, some have proposed using a fixture that allows for multi-station repositioning. By repositioning the tee fitting, the repeated clamping of the tee workpiece is eliminated, allowing multiple tee workpieces to be machined simultaneously, thus effectively improving machining efficiency. Summary of the Invention:

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a rotary clamping fixture for multi-pass machining of three-way workpieces. The rotary clamping fixture is equipped with multiple clamping heads. By rotating the three-way workpiece through the clamping heads, the workpiece can be switched between multiple machining stations, enabling the simultaneous machining of multiple workpieces. Furthermore, the same workpiece does not need to be repeatedly clamped, thereby improving machining efficiency.

[0004] A rotary clamping fixture for multi-pass machining of three-way joints includes a transverse drive shaft. A rotary seat with a regular hexagonal cross-section is inserted and fixed on the drive shaft. A rectangular fixed clamp is formed on the lower part of the outer wall of each side of the rotary seat, and a T-shaped lower three-way clamp is formed on the fixed clamp. A movable clamp is provided on each side of the outer wall of the rotary seat, which is opposite to the fixed clamp. A circular recess is formed in the middle of the end face of each side of the rotary seat. An opening component is inserted in the recess, which is opposite to the movable clamp on the front side and the lower front side of the rotary seat. The opening component is inserted on the drive shaft.

[0005] The movable clamping seat includes a rectangular movable clamping block. On the end face of the movable clamping block near the fixed clamping seat, an upper tee clamping opening is formed, which is directly opposite to the lower tee clamping opening. On the end face of the movable clamping block near the movable clamping block, several dovetail-shaped guide rails are formed. The guide rails are inserted into dovetail grooves that are parallel to the side of the rotary seat. The dovetail grooves are formed on the outer wall of the rotary seat. V-shaped grooves are formed on the end faces of the rotary seat on both sides of the movable clamping block. Clamping mechanisms are inserted into the grooves. The clamping mechanisms drive the movable clamping block to approach the fixed clamping seat to form a clamping head for holding the tee.

[0006] The clamping mechanism on the movable clamping seat includes a strip-shaped clamping arm. A T-shaped positioning pin is inserted into the inner end of the clamping arm and is fixed to the bottom surface of the groove. The outer ends of the clamping arm are distributed on both sides of the movable clamping block and have guide grooves formed. A transverse guide shaft is inserted into the movable clamping block. Both ends of the guide shaft extend out of the movable clamping block and pass through the spacer and are inserted into the guide groove of the clamping arm. The spacer is fixed to the guide shaft. A strip-shaped groove is formed on the clamping arm inside the guide groove. A vertical strip-shaped limiting groove is formed on the bottom surface of the groove. A T-shaped limiting post is inserted into the limiting groove. The end of the limiting post is fixed to the rotary seat. A clamping spring is inserted into the limiting post. One end of the clamping spring presses against the head of the limiting post and the other end presses against the bottom surface of the groove.

[0007] The opening assembly includes a cylindrical annular fixed base. A mounting groove is formed on the front side wall of the fixed base. Two cylinders, one facing forward and the other facing downward, are respectively inserted and fixed in the mounting groove. A right-angled triangular opening head is fixed on the piston rod of the cylinder. A support shaft is formed on the side wall of the clamping arm near the rotary seat side end face. A guide wheel is pivotally connected to the support shaft. Straight-line limit bars opposite to the guide wheels are formed on the rotary seat side end faces on both sides of the fixed clamping base. The opening head is located between the limit bars and the guide wheels.

[0008] Preferably, the movable clamping block on the movable clamping seat abuts against the outer wall of the rotary seat, the width of the movable clamping block is less than the thickness of the rotary seat, the outer wall of the front side of the rotary seat is vertical, and the movable clamping block is located on the upper side of the fixed clamping seat.

[0009] Preferably, the groove width of the guide shaft on the clamping arm is equal to the diameter of the guide groove, and the spacer is clamped between the clamping arm and the moving clamping block.

[0010] Preferably, the diameter of the outer wall of the fixing seat on the opening component is smaller than the diameter of the inner wall of the recess, the diameter of the inner wall of the fixing seat is larger than the diameter of the drive shaft, and one end of the fixing seat is located outside the rotary seat; the bottom surface of the mounting groove on the fixing seat is flush with the side end face of the rotary seat, and an arc-shaped connecting plate is formed on the outer wall of the rear side of the fixing seat, with a plurality of connecting holes formed on the connecting plate, and a gap is provided between the connecting plate and the rotary seat.

[0011] Preferably, the end face of the inclined side of the opening head is opposite to the guide wheel, and the end face of the right-angle side of the opening head is flush with the end face of the limiting stop bar near the opening head.

[0012] The limiting stop bar has a limiting groove with a longitudinal section of arc formed on the end face near the opening head, and a limiting strip opposite to the limiting groove is formed on the end face of the right-angle side of the opening head; the arc of the longitudinal section of the limiting groove is greater than π.

[0013] Preferably, the maximum center distance from the opening head to the drive shaft on the opening assembly is greater than the minimum center distance from the limiting stop bar to the drive shaft.

[0014] The beneficial effects of this invention are as follows:

[0015] This rotary clamping fixture is equipped with multiple clamping heads. By rotating the workpiece through the clamping head, the workpiece can be switched between multiple processing stations, allowing multiple workpieces to be processed simultaneously. At the same time, the same workpiece does not need to be clamped repeatedly, which can improve processing efficiency. Attached image description:

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0017] Figure 2 This is a frontal structural diagram of the present invention;

[0018] Figure 3 This is a side view of the structure of the present invention;

[0019] Figure 4 This is a three-dimensional structural diagram of the present invention with an opening component without one side.

[0020] In the diagram: 1. Drive shaft; 2. Rotary seat; 21. Fixed clamp seat; 22. Lower tee clamp; 23. Dovetail groove; 24. Shaped groove; 25. Limiting stop bar; 26. Limiting slot; 27. Recessed platform; 38. Moving clamp block; 31. Moving clamp block; 32. Support plate; 33. Support plate; 34. Clamping arm; 35. Limiting post; 36. Clamping spring; 37. Positioning pin; 38. Guide wheel; 4. Opening assembly; 41. Fixed seat; 42. Cylinder; 43. Opening head. Detailed implementation method:

[0021] Example: See Figures 1 to 4 As shown, a rotary clamping fixture for three-way multi-pass machining includes a transverse drive shaft 1. A rotary seat 2 with a regular hexagonal cross-section is inserted and fixed on the drive shaft 1. A rectangular fixed clamp 21 is formed on the lower part of the outer wall of each side of the rotary seat 2. A T-shaped lower three-way clamping opening 22 is formed on the fixed clamp 21. A movable clamp 3 is provided on each side of the outer wall of the rotary seat 2, which is opposite to the fixed clamp 21. A circular recess 27 is formed in the middle of the two end faces of the rotary seat 2. An opening component 4 is inserted in the recess 27, which is opposite to the movable clamp 3 on the front side and the lower front side of the rotary seat 2. The opening component 4 is inserted and sleeved on the drive shaft 1.

[0022] The movable clamping seat 3 includes a rectangular movable clamping block 31. On the end face of the movable clamping block 31 near the fixed clamping seat 21, an upper tee clamping opening 312 is formed, which is directly opposite to the lower tee clamping opening 22. On the end face of the movable clamping block 31 near the movable clamping block 31, a plurality of dovetail-shaped guide rails 311 are formed. The guide rails 311 are inserted into dovetail grooves 23 parallel to the side of the rotary seat 2. The dovetail grooves 23 are formed on the outer wall of the rotary seat 2. V-shaped grooves 24 are formed on the end faces of the rotary seat 2 on both sides of the movable clamping block 31. Clamping mechanisms are inserted into the grooves 24 respectively. The clamping mechanisms drive the movable clamping block 31 to approach the fixed clamping seat 21 to form a clamping head for holding the tee. The lower tee clamping opening 22 on the fixed clamping seat 21 and the upper tee clamping opening 312 on the movable clamping block 31 can cooperate to clamp and fix the tee. One end of the tee faces forward, and the other two ends are distributed on both sides of the movable clamping block 31.

[0023] The clamping mechanism on the movable clamping seat 3 includes a strip-shaped clamping arm 34. A T-shaped positioning pin 37 is inserted into the inner end of the clamping arm 34 and is fixed to the bottom surface of the groove 24. The outer ends of the clamping arm 34 are distributed on both sides of the movable clamping block 31 and have guide grooves 341 formed therein. A transverse guide shaft 32 is inserted into the movable clamping block 31. Both ends of the guide shaft 32 extend out of the movable clamping block 31 and pass through a spacer 33, inserting into the guide groove 341 of the clamping arm 34. The spacer 33 is fixed to the guide shaft 32. The clamping mechanism inside the guide groove 341... The clamping arm 34 has a strip-shaped groove 342 formed on its surface. A vertical strip-shaped limiting groove 343 is formed on the bottom surface of the groove 342. A T-shaped limiting post 35 is inserted into the limiting groove 343. The end of the limiting post 35 is inserted and fixed to the rotary seat 2. A clamping spring 36 is inserted into the limiting post 35. One end of the clamping spring 36 presses against the head of the limiting post 35, and the other end presses against the bottom surface of the groove 342. The limiting post 35 can be bolted. The size of the groove 24 on the rotary seat 2 is sufficient to accommodate the bolted installation of the limiting post 35.

[0024] The opening assembly 4 includes a cylindrical annular fixed base 41. A mounting groove 411 is formed on the front side wall of the fixed base 41. Two cylinders 42, one facing forward and the other facing downward, are respectively inserted and fixed in the mounting groove 411. A right-angled triangular opening head 43 is fixed on the piston rod of the cylinder 42. A support shaft 344 is formed on the side wall of the clamping arm 34 near the side end face of the rotary seat 2. A guide wheel 38 is pivotally connected to the support shaft 344. Straight-line limiting bars 25, which are opposite to the guide wheel 38, are formed on the side end faces of the rotary seat 2 on both sides of the fixed clamp 21. The opening head 43 is located between the limiting bar 25 and the guide wheel 38.

[0025] Preferably, the movable clamping block 31 on the movable clamping seat 3 abuts against the outer wall of the rotary seat 2, the width of the movable clamping block 31 is less than the thickness of the rotary seat 2, the outer wall of the front side of the rotary seat 2 is vertical, and the movable clamping block 31 is located on the upper side of the fixed clamping seat 21.

[0026] The groove width of the guide shaft 32 on the clamping arm 34 is equal to the diameter of the guide groove 341. The spacer 33 is clamped between the clamping arm 34 and the moving clamping block 31. The spacer 33 can restrict the guide shaft 32 from disengaging from the moving clamping block 31.

[0027] The diameter of the outer wall of the fixed seat 41 on the opening assembly 4 is smaller than the diameter of the inner wall of the recess 27, and the diameter of the inner wall of the fixed seat 41 is larger than the diameter of the drive shaft 1. One end of the fixed seat 41 is located outside the rotary seat 2. The bottom surface of the mounting groove 411 on the fixed seat 41 is flush with the side end face of the rotary seat 2. An arc-shaped connecting plate 412 is formed on the outer wall of the rear side of the fixed seat 41. Several connecting holes 413 are formed on the connecting plate 412. There is a gap between the connecting plate 412 and the rotary seat 2. When this clamping fixture is installed, the rotary seat 2 can rotate and change position with the drive shaft 1. The drive shaft 1 is connected to the CNC lathe for machining tees through bearings. Bolts can be inserted into the connecting holes 413 on the fixed seat 4 of the opening assembly 4 and fixed to the CNC lathe for machining tees by bolts. The opening assembly 4 is fixed.

[0028] The end face of the inclined side of the opening head 43 is opposite to the guide wheel 38, and the end face of the right-angle side of the opening head 43 is flush with the end face of the limiting stop 25 near the opening head 43. The limiting stop 25 can be used as a reference for the movement of the opening head 43. When the opening head 43 moves, the limiting stop 25 can drive the guide wheel 38 to move, thereby realizing the rotation of the clamping arm 34.

[0029] The limiting stop 25 has a limiting groove 26 with a longitudinal section of arc shape formed on the end face near the opening head 43. The opening head 43 has a limiting strip 431 opposite to the limiting groove 26 formed on the end face of the right-angle side. The arc of the longitudinal section of the limiting groove 26 is greater than π. Because of the existence of the limiting groove 26, when the opening head 43 moves with the piston rod of the cylinder 42, the limiting strip 431 can be inserted into the limiting groove 26. The opening head 43 can restrict the rotation of the rotary seat 2 and realize the positioning of the rotary seat 2 at each processing station.

[0030] The maximum center distance from the opening head 43 on the opening assembly 4 to the drive shaft 1 is greater than the minimum center distance from the limit stop 25 to the drive shaft 1. The above distance is limited to the state when the piston rod of the cylinder 42 is retracted. When the rotary seat 2 rotates to realize the work position change, the opening head 43 will not interfere.

[0031] Working principle: This invention is a rotary clamping fixture for three-way multi-pass machining. The main body of the rotary clamping fixture is a regular hexagonal rotary seat 2. Each side of the outer wall of the rotary seat 2 represents a workstation. Therefore, a clamping chuck consisting of a movable clamping seat 3 and a fixed clamping seat 21 is provided on each side of the outer wall of the rotary seat 2; For example... Figure 1 ,2 As shown, the front of the rotary seat 2 is the loading station, the upper front, upper rear, and rear sides of the rotary seat 2 are the processing stations for the three ports of the tee, the lower rear of the rotary seat 2 is the cleaning station, where the chips of the tee can be cleaned by blowing air, and the lower front of the rotary seat 2 is the unloading station, which realizes the unloading of the tee.

[0032] Therefore, the rotary seat 2 is provided with opening components 4 on both sides. The opening components 4 are provided with two sets of opening heads 43 opposite to the loading station and the unloading station. The opening heads 43 can be moved by the cylinder 42, which in turn drives the clamping arm 34 on the moving clamp seat 3 to rotate around the positioning pin 37, and drives the moving clamp block 31 to move. Thus, the moving clamp block 31 can move away from the fixed clamp seat 21. At the loading station, the tee can be placed on the fixed clamp seat 21, while at the unloading station, the tee can fall off automatically.

[0033] At other workstations, the moving clamping block 31 on the moving clamping seat 3 clamps and fixes the tee workpiece in conjunction with the clamping spring 36 and the fixed clamping seat 21.

[0034] The embodiments described are illustrative of the invention and are not intended to limit the invention. Any person skilled in the art can modify the embodiments without departing from the spirit and scope of the invention; therefore, the scope of protection of the invention should be as set forth in the claims.

Claims

1. A rotary clamping fixture for multi-pass machining of three-way joints, comprising a transverse drive shaft (1), a rotary seat (2) with a regular hexagonal cross-section fixed on the drive shaft (1), a rectangular fixed clamping seat (21) formed on the lower part of the outer wall of each side of the rotary seat (2), and a T-shaped lower three-way clamping mouth (22) formed on the fixed clamping seat (21); characterized in that: The rotary seat (2) has a movable clamp (3) on each side outer wall that is opposite to the fixed clamp (21); the rotary seat (2) has a circular recess (27) formed in the middle of the two end faces; an opening component (4) is inserted in the recess (27) that is opposite to the movable clamp (3) on the front side and lower front of the rotary seat (2); the opening component (4) is sleeved on the drive shaft (1). The movable clamp (3) includes a rectangular movable clamp (31). The movable clamp (31) has an upper tee clamp (312) that is directly opposite to the lower tee clamp (22) on the end face of the movable clamp (31) near the fixed clamp (21). Several dovetail-shaped guide rails (311) are formed on the end face of the movable clamp (31). The guide rails (311) are inserted into dovetail grooves (23) that are parallel to the side of the rotary seat (2). The dovetail grooves (23) are formed on the outer wall of the rotary seat (2). V-shaped grooves (24) are formed on the end faces of the rotary seat (2) on both sides of the movable clamp (31). Clamping mechanisms are inserted into the grooves (24). The clamping mechanisms drive the movable clamp (31) to approach the fixed clamp (21) to form a clamping head for holding the tee. The clamping mechanism on the movable clamping seat (3) includes a strip-shaped clamping arm (34). A T-shaped positioning pin (37) is inserted into the inner end of the clamping arm (34). The positioning pin (37) is inserted and fixed on the bottom surface of the groove (24). The outer ends of the clamping arm (34) are distributed on both sides of the movable clamping block (31) and have guide grooves (341) formed. A transverse guide shaft (32) is inserted into the movable clamping block (31). The two ends of the guide shaft (32) extend out of the movable clamping block (31) and pass through the spacer (33) and are inserted into the guide groove (341) of the clamping arm (34). The guide groove (341) is fixed on the guide shaft (32); a strip-shaped groove (342) is formed on the clamping arm (34) inside the guide groove (341), and a vertical strip-shaped limiting groove (343) is formed on the bottom surface of the groove (342). A T-shaped limiting post (35) is inserted into the limiting groove (343), and the end of the limiting post (35) is inserted and fixed on the rotary seat (2). A clamping spring (36) is inserted on the limiting post (35), and one end of the clamping spring (36) presses against the head of the limiting post (35) and the other end presses against the bottom surface of the groove (342). The opening assembly (4) includes a cylindrical ring-shaped fixed seat (41), and an installation groove (411) is formed on the side wall of the front side of the fixed seat (41). Two cylinders (42) with longitudinal forward and inclined downward are respectively inserted and fixed in the installation groove (411). A right-angled triangular opening head (43) is fixed on the piston rod of the cylinder (42). A support shaft (344) is formed on the side wall of the clamping arm (344) near the side end face of the rotary seat (2). A guide wheel (38) is pivotally connected to the support shaft (344). A straight limit bar (25) opposite to the guide wheel (38) is formed on the side end face of the rotary seat (2) on both sides of the fixed clamp (21). The opening head (43) is set between the limit bar (25) and the guide wheel (38).

2. The rotary clamping fixture for three-way multi-pass machining according to claim 1, characterized in that: The movable clamping block (31) on the movable clamping seat (3) abuts against the outer wall of the rotary seat (2). The width of the movable clamping block (31) is less than the thickness of the rotary seat (2). The outer wall of the front side of the rotary seat (2) is vertical. The movable clamping block (31) is located on the upper side of the fixed clamping seat (21).

3. The rotary clamping fixture for three-way multi-pass machining according to claim 1, characterized in that: The groove width of the guide shaft (32) on the clamping arm (34) is equal to the diameter of the guide groove (341), and the spacer (33) is clamped between the clamping arm (34) and the moving clamping block (31).

4. The rotary clamping fixture for three-way multi-pass machining according to claim 1, characterized in that: The diameter of the outer wall of the fixed seat (41) on the opening component (4) is smaller than the diameter of the inner wall of the recess (27), and the inner wall diameter of the fixed seat (41) is larger than the diameter of the drive shaft (1). One end of the fixed seat (41) is located outside the rotary seat (2). The bottom surface of the mounting groove (411) on the fixed seat (41) is flush with the side end face of the rotary seat (2). An arc-shaped connecting plate (412) is formed on the outer wall of the rear side of the fixed seat (41). Several connecting holes (413) are formed on the connecting plate (412). A gap is provided between the connecting plate (412) and the rotary seat (2).

5. A rotary clamping fixture for three-way multi-pass machining according to claim 4, characterized in that: The end face of the inclined side of the opening head (43) is opposite to the guide wheel (38), and the end face of the right angle side of the opening head (43) is flush with the end face of the limiting stop (25) near the opening head (43). The limiting stop (25) has a limiting groove (26) with a circular arc cross section formed on the end face near the opening head (43), and a limiting strip (431) opposite to the limiting groove (26) is formed on the end face of the right-angle side of the opening head (43); the arc of the longitudinal section of the limiting groove (26) is greater than π.

6. A rotary clamping fixture for three-way multi-pass machining according to claim 1, characterized in that: The maximum center distance from the opening head (43) on the opening assembly (4) to the drive shaft (1) is greater than the minimum center distance from the limit stop (25) to the drive shaft (1).

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