Six-point positioning fixture for guiding vane without installation plate

Abstract

The application discloses a kind of installation plate-free guide vane six-point positioning clamps, it is related to the structural design and application technical field of vane positioning clamp, the installation plate-free guide vane six-point positioning clamp includes: bottom plate, main pressing device, auxiliary pressing device, vane back auxiliary support device, vane basin auxiliary support device, radial positioning block, radial positioning ball pin, vane back positioning ball pin, blade edge positioning structure and process ball;Wherein, the lower end of main pressing device, vane back auxiliary support device, vane basin auxiliary support device and process ball is connected on bottom plate, the installation plate-free guide vane six-point positioning clamp, by reasonable tool structure, perfect quick pressing and auxiliary positioning structure design, can complete vane stable positioning clamping, effectively dispersed stress state at positioning point, prevent vane processing process to produce pressure injury.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structural design and application of blade positioning fixtures, and particularly provides a six-point positioning fixture for installation plate-free guide vanes. BACKGROUND

[0002] The installation plate-free guide vane assembly groove is located on the upper and lower installation head vane back sides, and the vane is placed in a reverse positioning posture during machining. The main pressing needs to be completed by a top pressing mechanism from below to press the vane, and the pressing force is opposite to the machining cutting force and forms a certain angle, which puts forward higher requirements for the clamping stability during the machining of the part.

[0003] People urgently hope to obtain a six-point positioning fixture for installation plate-free guide vanes with excellent technical effects. SUMMARY

[0004] The purpose of the present application is to provide a six-point positioning fixture for installation plate-free guide vanes with excellent technical effects. The part clamping and positioning stability is effectively improved, the number of reference conversions is reduced, the upper and lower installation head assembly grooves are clamped at the same time during machining, and the part clamping efficiency is improved.

[0005] The six-point positioning fixture for installation plate-free guide vanes comprises a bottom plate, a main pressing device, an auxiliary pressing device, a vane back auxiliary support device, a vane basin auxiliary support device, a radial positioning block, a radial positioning ball pin, a vane back positioning ball pin, a process ball and a blade edge positioning structure. The lower end of the main pressing device, the vane back auxiliary support device, the vane basin auxiliary support device and the process ball is connected to the bottom plate. The process ball is used to establish a coordinate system when programming the vane numerical control machining program. The main pressing device and the auxiliary pressing device are respectively connected to the vane back auxiliary support device. The vane back positioning ball pin is arranged on the vane back auxiliary support device. The radial positioning ball pin is connected to the radial positioning block. The radial positioning block is connected to the vane back auxiliary support device. The blade edge positioning structure is connected to the vane basin auxiliary support device.

[0006] Preferably, the blade edge positioning structure is a right-angle type blade edge structure, and two groups of right-angle type blade edge structures are respectively positioned at two points of the vane exhaust edge close to the vane basin side ridge edge and two points of the vane exhaust edge close to the vane back side ridge edge. The vane exhaust ridge edge is narrow, the positions of the four positioning points are close, and the design is a blade type point contact positioning mode.

[0007] Preferably, the radial positioning ball pin and the vane back positioning ball pin are respectively positioned at one point of the vane upper installation head end face and one point of the vane back. Since the positioning area of the vane back and the vane upper installation head end face is relatively large, a spherical positioning pin is used to form a point contact type positioning mode. The vane upper installation head end face is the vane radial end face.

[0008] The Z-direction reference of the blade is determined by three points, one point on the back of the blade and two points on the back side ridge of the blade exhaust edge, the Y-direction reference is determined by one point on the end face of the mounting head, and the X-direction reference of the blade is determined by two points on the back side ridge of the blade exhaust edge. The positioning constraints of six spatial degrees of freedom are established. The four points of the back side ridge of the blade exhaust edge are positioned by using the straight blade structure, and the width is 2 mm. This positioning method can effectively prevent the displacement and torsion of the blade during the machining process.

[0009] When clamping, the main pressing device and the auxiliary pressing device are in a loose state, the back auxiliary supporting device and the basin auxiliary supporting device are in a flexible rebound state, the basin is held with the blade facing the right and downward, the blade is manually pushed into the clamp along the radial direction, and after the six positioning points are attached, the main pressing device, the auxiliary pressing device, and finally the back auxiliary supporting device and the basin auxiliary supporting device are locked in sequence.

[0010] Preferably, the basin auxiliary supporting device comprises a basin positioning block, an oil injection port, a basin auxiliary positioning pin, a threaded bushing, a threaded compression spring, an o-shaped rubber sealing ring, a top pin, a plunger, and an internal hexagonal locking screw. The basin positioning block is internally hollow, the basin positioning block is provided with an oil injection port, the oil injection port is provided with a plug, the basin auxiliary positioning pin is connected to the basin positioning block, the threaded bushing is connected to the basin auxiliary positioning pin, the threaded compression spring is connected to the threaded bushing, the o-shaped rubber sealing ring is connected to the top pin, the top pin passes through the o-shaped rubber sealing ring, the threaded compression spring, and the threaded bushing to be connected to the basin auxiliary positioning pin, the plunger is connected to the internal hexagonal locking screw, the threaded compression spring is connected to the plunger, and the o-shaped rubber sealing ring is connected to the plunger.

[0011] The basin auxiliary supporting device can realize flexible pressing function, can adjust the space position of the auxiliary supporting point suitable for different raw material profiles, can manually lock the supporting device after completing the auxiliary supporting positioning, and can complete the blade clamping positioning. In addition, two auxiliary positioning mechanisms are designed near the blade back to the positioning point, the positioning pin is internally designed as a slide, the spring is used to realize the free extension of the basin auxiliary positioning pin, the slide groove is provided with a pressing pin, and the blade auxiliary supporting positioning can be manually locked after being completed.

[0012] The basin auxiliary supporting device can be injected with hydraulic oil through the oil injection port, four assembly and debugging mechanisms can be adjusted according to the blade raw material state during the tooling debugging stage, and the plug can be sealed with sealant after being assembled and qualified. During the blade clamping process, the three auxiliary positioning pins are in a flexible and relaxed state, after the blade is clamped and positioned, the basin auxiliary positioning pin will gradually move outward by manually rotating the internal hexagonal locking screw, and the positioning pin will automatically stop moving when the positioning pin is stably attached to the blade profile. After the three auxiliary positioning pins are all attached, the auxiliary supporting operation is completed, and the structure can meet the profile-following auxiliary supporting requirements of different profiles.

[0013] Preferably, the main pressing device comprises a first cam handle, a first pressing plate, a first spiral compression spring, a resin pressing block, a hinge shaft and a pressing rod; wherein the first cam handle is connected to one end of the bottom plate and the first pressing plate through the pressing rod, the resin pressing block is located at the other end of the first pressing plate, the first spiral compression spring is arranged between the bottom plate and the pressing plate, and the first pressing plate is connected with the blade back auxiliary support device through the hinge shaft.

[0014] When the first cam handle is upward, the pressing device is in a loosening state, and when the first cam handle is pressed downward to a horizontal posture, the pressing device is in a locking state, and the main pressing device can realize the quick pressing function in the main pressing direction. The blade processing posture is reverse positioning, the main pressing device is designed at the blade inlet leading edge, the lever and cam structure are adopted to press the blade from bottom to top, the contact position of the main pressing device and the blade inlet leading edge is selected to be resin material, which is embedded in the pressing plate groove in the form of a slide, which is convenient for later maintenance and replacement, and can meet the flexible pressing function requirement of different state rough material profiles.

[0015] Preferably, the auxiliary pressing device comprises a second cam handle, an internal hexagonal cylindrical head screw and a second pressing plate; one end of the second cam handle is connected with the second pressing plate, and the second pressing plate is connected with the blade back auxiliary support device through the internal hexagonal cylindrical head screw. When the two cam handles are vertical, the pressing device is in a loosening state, and when the two cam handles are pressed to a horizontal posture, the pressing device is in a locking state, and the device can realize the quick pressing function in the auxiliary pressing direction. The auxiliary pressing device is designed at the lower mounting head end surface of the blade, and the cam and pressing plate structure is adopted, and the two pressing devices can realize the quick pressing function.

[0016] Preferably, the blade back auxiliary support device comprises a blade back auxiliary support pin, a locking screw and a second spiral compression spring; the blade back auxiliary support pin is connected with the locking screw, and the second spiral compression spring is sleeved on the blade back auxiliary support pin. During the clamping process of the blade, the locking screw is screwed outward, the blade back auxiliary support pin is in a flexible rebound mode, after the blade is clamped and positioned and the blade back auxiliary support pin is attached to the blade profile, the locking screw is manually locked, the two blade back auxiliary support pins are locked, and the stability of the auxiliary positioning and clamping during the blade processing is ensured.

[0017] Preferably, handles are connected to both sides of the bottom plate.

[0018] The blade before machining is generally called rough material, and the positioning reference is generally divided into a positioning reference provided by the rough material and a positioning reference formed after machining. The self-provided positioning reference has large error and low precision, and the positioning reference after machining has high precision. The six-point positioning clamp for the installation plate-free guide vane selects six rough material points to provide a positioning reference for machining an installation groove, as a machining reference, and designs multiple adjustable auxiliary support mechanisms near the positioning points, which can match different rough material profiles and can be fixed and locked after the part is clamped, thereby optimizing the stress distribution state during part machining and improving the stability of the part reverse positioning clamp.

[0019] The six-point positioning clamp for the installation plate-free guide vane can be applied to six-point positioning clamping of the installation plate-free guide vane. The cam and lever structure can realize the reverse positioning and pressing function and one-key quick pressing function, thereby effectively improving the convenience of part clamping. The closed hydraulic oil flexible auxiliary support system can adapt to the actual situation of large casting rough material profile error and meet the flexible positioning requirement.

[0020] The six-point positioning clamp for the installation plate-free guide vane can be applied to six-point positioning clamping of the installation plate-free guide vane. The cam and lever structure can realize the reverse positioning and pressing function and one-key quick pressing function, thereby effectively improving the convenience of part clamping. The closed hydraulic oil flexible auxiliary support system can adapt to the actual situation of large casting rough material profile error and meet the flexible positioning requirement. BRIEF DESCRIPTION OF DRAWINGS

[0021] The application will be described in further detail below with reference to the drawings and embodiments:

[0022] Figure 1 It is a front view of the six-point positioning clamp for the installation plate-free guide vane.

[0023] Figure 2 It is a top view of the six-point positioning clamp for the installation plate-free guide vane.

[0024] Figure 3 It is a schematic view of a blade back positioning ball pin.

[0025] Figure 4 It is a schematic view of a main pressing device structure.

[0026] Figure 5 It is a schematic view of an auxiliary pressing device structure.

[0027] Figure 6 It is a Figure 2 It is a sectional view at E-E.

[0028] Figure 7 It is a schematic view of the internal structure of the blade basin auxiliary support device.

[0029] Figure 8Schematic diagram of the auxiliary support device for the blade back. DETAILED DESCRIPTION

[0030] Embodiment 1

[0031] The six-point positioning fixture for the installation plate-free guide vane includes a bottom plate 1, a main pressing device 2, an auxiliary pressing device 3, an auxiliary support device 4 for the blade back, an auxiliary support device 5 for the blade basin, a radial positioning block 6, a radial positioning ball pin 7, a blade back positioning ball pin 8, a process ball 9, and a blade edge positioning structure 10. The lower end of the main pressing device 2, the auxiliary support device 4 for the blade back, the auxiliary support device 5 for the blade basin, and the process ball 9 are connected to the bottom plate 1. The process ball 9 is used to establish a coordinate system for programming the numerical control machining program. The main pressing device 2 and the auxiliary pressing device 3 are connected to the auxiliary support device 4 for the blade back. The auxiliary support device 4 for the blade back is provided with the blade back positioning ball pin 8. The radial positioning ball pin 7 is connected to the radial positioning block 6. The radial positioning block 6 is connected to the auxiliary support device 4 for the blade back. The blade edge positioning structure 10 is connected to the auxiliary support device 5 for the blade basin.

[0032] Preferably, the blade edge positioning structure 10 is a right-angle type blade edge structure. Two groups of right-angle type blade edge structures are respectively positioned at two points of the blade exhaust edge close to the side ridge of the blade basin and two points of the blade exhaust edge close to the side ridge of the blade back. The blade exhaust ridge is narrow, and the positions of the four positioning points are close. The design is a blade type point contact positioning mode.

[0033] Preferably, the radial positioning ball pin 7 and the blade back positioning ball pin 8 are respectively positioned at one point of the blade upper mounting head end face and one point of the blade back. Because the positioning areas of the blade back and the blade upper mounting head end face are relatively large, a spherical positioning pin is used to form a point contact positioning mode. The blade upper mounting head end face is the radial end face of the blade.

[0034] The Z direction reference of the blade is determined by three points of one point of the blade back, two points of the blade exhaust edge close to the side ridge of the blade back. The Y direction reference is determined by one point of the blade upper mounting head end face. The X direction reference of the blade is determined by two points of the blade exhaust edge close to the side ridge of the blade basin. The positioning constraints of six spatial degrees of freedom are established. The four points of the blade exhaust edge basin and back side ridge are positioned by the right-angle type blade edge structure with a width of 2 mm. This positioning mode can effectively prevent displacement and torsion of the blade during machining.

[0035] During clamping, the main pressing device two and the auxiliary pressing device three are in a loosened state. The auxiliary support device 4 for the blade back and the auxiliary support device 5 for the blade basin are in a flexible rebound state. The blade basin is held with the hand facing the blade in a right and downward direction. The blade is manually pushed into the fixture along the radial direction. After the six positioning points are attached, the main pressing device 2, the auxiliary pressing device 3, the auxiliary support device 4 for the blade back, and the auxiliary support device 5 for the blade basin are sequentially locked.

[0036] Preferably, the auxiliary support device 5 of the vane pot comprises a vane pot positioning block 51, an oil injection port 52, a vane pot auxiliary positioning pin 53, a threaded bushing 54, a threaded compression spring 55, an o-shaped rubber sealing ring 56, a top pin 57, a plunger 58, an internal hexagonal locking screw 59; wherein the vane pot positioning block 51 is internally hollow, the vane pot positioning block 51 is provided with an oil injection port 52, the oil injection port 52 is provided with a plug 60, the vane pot auxiliary positioning pin 53 is connected to the vane pot positioning block 51, the threaded bushing 54 is connected to the vane pot auxiliary positioning pin 53, the threaded compression spring 55 is connected to the threaded bushing 54, the o-shaped rubber sealing ring 56 is connected to the top pin 57, the top pin 57 passes through the o-shaped rubber sealing ring 56, the threaded compression spring 55, the threaded bushing 54 and the vane pot auxiliary positioning pin 53, the plunger 58 is connected to the internal hexagonal locking screw 59, the threaded compression spring 55 is connected to the plunger 58, and the o-shaped rubber sealing ring 56 is connected to the plunger 58.

[0037] The auxiliary support device 5 of the vane pot can realize flexible compression function, can adjust the auxiliary support point space position suitable for different raw material profiles, can be manually locked after auxiliary support positioning is completed, and can complete vane clamping positioning. In addition, two auxiliary positioning mechanisms are designed near the position of the back of the vane, the inside of the positioning pin is designed as a slide, the auxiliary positioning pin is freely extended and retracted by using a spring, a compression pin is matched in the slide groove, and the vane auxiliary support positioning can be manually locked after being completed.

[0038] The inside of the auxiliary support device 5 of the vane pot can inject hydraulic oil 61 through the oil injection port, four assembly and debugging mechanisms can be adjusted according to the vane raw material state during the tool debugging stage, and the plug is sealed by using sealing glue after being assembled and debugged. During the vane clamping process, the three auxiliary positioning pins are in a flexible relaxed state, after the vane completes clamping positioning, the auxiliary positioning pin is gradually extended outward to the vane profile by manually rotating the internal hexagonal locking screw, the positioning pin automatically stops moving when the positioning pin is stably attached to the vane profile, and the auxiliary support operation is completed after the three auxiliary positioning pins are completely attached, which can meet the profile-following auxiliary support requirements of different profiles.

[0039] Preferably, the main compression device 2 comprises a first cam handle 21, a first pressing plate 22, a first spiral compression spring 23, a resin compression block 24, a hinge shaft 25 and a pressure rod 26; wherein the first cam handle 21 is connected to the bottom plate 1 and one end of the first pressing plate 22 through the pressure rod 26, the resin compression block 24 is located at the other end of the first pressing plate 22, the first spiral compression spring 23 is arranged between the bottom plate 1 and the pressing plate, and the first pressing plate 22 is connected to the back auxiliary support device 4 through the hinge shaft 25.

[0040] The first cam handle 21 is upward when the pressing device is loosened, and the first cam handle 21 is pressed to the horizontal posture when the pressing device is locked, so that the main pressing device 2 can realize the quick pressing function in the main pressing direction. The blade processing posture is reversely positioned, the main pressing device 2 is designed at the blade air inlet leading edge, the lever and the cam structure are adopted to press the blade from bottom to top, the contact position of the main pressing device 2 and the blade air inlet leading edge is selected to be resin material, is embedded in the pressing plate groove in the form of a slide, is convenient for later maintenance and replacement, and can meet the flexible pressing function requirement of different state rough material profiles.

[0041] Preferably, the auxiliary pressing device 3 comprises a second cam handle 31, an internal hexagonal cylindrical head screw 32 and a second pressing plate 33; one end of the second cam handle 31 is connected with the second pressing plate 33, and the second pressing plate 33 is connected with the blade back auxiliary supporting device 4 through the internal hexagonal cylindrical head screw 32. The second cam handle 31 is vertical when the pressing device is loosened, and the second cam handle 31 is pressed to the horizontal posture when the pressing device is locked, so that the device can realize the quick pressing function in the auxiliary pressing direction. The auxiliary pressing device 3 is designed at the blade lower mounting head end surface, and the cam and the pressing plate structure are adopted, so that the two pressing devices can realize the quick pressing function.

[0042] Preferably, the blade back auxiliary supporting device 4 comprises a blade back auxiliary supporting pin 41, a locking screw 42 and a second spiral compression spring 43; the blade back auxiliary supporting pin 41 is connected with the locking screw 42, and the second spiral compression spring 43 is sleeved on the blade back auxiliary supporting pin 41. During the blade clamping process, the locking screw 42 is rotated outward, the blade back auxiliary supporting pin 41 is in the flexible rebound mode, after the blade is clamped and positioned and the blade back auxiliary supporting pin 41 is attached to the blade profile, the locking screw 42 is manually locked, the two blade back auxiliary supporting pins 41 are locked, and the stability of the auxiliary positioning and clamping during the blade processing is ensured.

[0043] Preferably, the bottom plate 1 is connected with a handle 12 on both sides.

Claims

1. A six-point positioning fixture for guide vanes without mounting plates, characterized in that: The six-point positioning fixture for guide vanes without mounting plates includes: a base plate (1), a main clamping device (2), an auxiliary clamping device (3), an auxiliary support device for the blade back (4), an auxiliary support device for the blade base (5), a radial positioning block (6), a radial positioning ball pin (7), a positioning ball pin for the blade back (8), a process ball (9), and a blade positioning structure (10); wherein, the lower ends of the main clamping device (2), the auxiliary support device for the blade back (4), the auxiliary support device for the blade base (5), and the process ball (9) are connected to the base plate (1), and the main clamping device (2) and the auxiliary clamping device (3) are respectively connected to the auxiliary support device for the blade back (4). Connected to each other, the blade back auxiliary support device (4) is provided with a blade back positioning ball pin (8), the radial positioning ball pin (7) is connected to the radial positioning block (6), the radial positioning block (6) is connected to the blade back auxiliary support device (4), the blade positioning structure (10) is connected to the blade basin auxiliary support device (5), the blade positioning structure (10) is a right-angle blade structure, the two sets of right-angle blade structures respectively position the two points of the blade exhaust side near the blade basin side edge and the two points of the blade exhaust side near the blade back side edge, the radial positioning ball pin (7) and the blade back positioning ball pin (8) respectively position the one point of the mounting head end face on the blade and the one point on the blade back.

2. The six-point positioning fixture for guide vanes without mounting plates as described in claim 1, characterized in that: The blade basin auxiliary support device (5) includes a blade basin positioning block (51), an oil inlet (52), a blade basin auxiliary positioning pin (53), a threaded bushing (54), a threaded compression spring (55), an O-ring rubber seal (56), a top pin (57), a plunger (58), and an internal hexagonal locking screw (59); wherein, the blade basin positioning block (51) has a hollow internal structure, an oil inlet (52) is provided on the blade basin positioning block (51), a plug (60) is provided at the oil inlet (52), and the blade basin auxiliary positioning pin (53) is connected to the blade basin positioning block (51). 1) On the upper part, the threaded bushing (54) is connected to the blade basin auxiliary positioning pin (53), the threaded compression spring (55) is connected to the threaded bushing (54), the O-ring rubber seal (56) is connected to the top pin (57), the top pin (57) passes through the O-ring rubber seal (56), the threaded compression spring (55) and the threaded bushing (54) and is connected to the blade basin auxiliary positioning pin (53), the plunger (58) is connected to the internal hexagon lock screw (59), the threaded compression spring (55) is connected to the plunger (58), and the O-ring rubber seal (56) is connected to the plunger (58).

3. The six-point positioning fixture for guide vanes without mounting plates according to claim 2, characterized in that: The main clamping device (2) includes a first cam handle (21), a first pressure plate (22), a first spiral compression spring (23), a resin clamping block (24), a hinge shaft (25), and a pressure rod (26); wherein, the first cam handle (21) is connected to one end of the base plate (1) and the first pressure plate (22) through the pressure rod (26), the resin clamping block (24) is located at the other end of the first pressure plate (22), the first spiral compression spring (23) is provided between the base plate (1) and the pressure plate, and the first pressure plate (22) is connected to the blade back auxiliary support device (4) through the hinge shaft (25).

4. The six-point positioning fixture for guide vanes without mounting plates according to claim 3, characterized in that: The auxiliary clamping device (3) includes a second cam handle (31), an internal hexagonal head screw (32), and a second pressure plate (33); one end of the second cam handle (31) is connected to the second pressure plate (33), and the second pressure plate (33) is connected to the blade back auxiliary support device (4) through the internal hexagonal head screw (32).

5. The six-point positioning fixture for guide vanes without mounting plates according to claim 4, characterized in that: The blade back auxiliary support device (4) includes a blade back auxiliary support pin (41), a locking screw (42), and a second spiral compression spring (43); the blade back auxiliary support pin (41) is connected to the locking screw (42), and the second spiral compression spring (43) is sleeved on the blade back auxiliary support pin (41).

6. The six-point positioning fixture for guide vanes without mounting plates according to any one of claims 1 to 5, characterized in that: Handles (12) are connected to both sides of the base plate (1).

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