An indexable fixture for automatic drilling and milling of fixed-length chords
By designing three sets of positioning and clamping mechanisms, steering and orienting mechanisms of the indexable fixture, the problem of inconvenient operation of the existing chord fixture is solved, and convenient rotation positioning and multi-directional processing of the chord are achieved, and the clamping and fixation are more secure.
Patent Information
- Application Number
- CN202311207978.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-19
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2043-09-19
AI Technical Summary
The existing chord rod clamp needs to be frequently disassembled and assembled when drilling holes in different directions on the chord rod, which makes the operation inconvenient and makes it difficult to achieve one-time clamping and rotational positioning of multiple chord rods.
A rotatable fixture is designed, which includes three sets of positioning and clamping mechanisms, a steering mechanism and an orienting mechanism. The rotation of the rotary inner ring is achieved through the steering mechanism and is fixed by the orienting mechanism. Combined with the upper clamping, side positioning and axial positioning mechanisms, the rotational positioning and fixation of the chord are achieved.
It realizes convenient rotation positioning and multi-directional processing of the chord, improves processing efficiency and the convenience of using the fixture, and the clamping is more firm, which is suitable for the positioning requirements of different types of chords.
Smart Images
Figure CN117086670B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of chord processing equipment, and in particular relates to an indexable fixture for realizing automatic drilling and milling processing of a fixed-length chord. Background Art
[0002] In the tower crane industry, chords are typically long, square steel tube welded parts. The chords consist of square steel tubes, onto which are fixedly mounted lugs, several third connecting plates, treads, angle steel, lugs, railing connecting plates, and other components. Different types of chords have different components fixed to the square steel tubes, and require assembly in groups of four fixed-length chords. This places high demands on the hole spacing and positional accuracy of the chord's end faces and connecting holes. In particular, the vertical connecting holes at both ends of the chord require inspection using a 90° special inspection fixture. Existing technology fixes the chords using existing clamping methods. When drilling holes in different directions, the chords can only be removed from the existing fixture and reinstalled by rotating the chords, which is extremely inconvenient. Therefore, it is necessary to design a reversible fixture for the chords that can accommodate multiple chords at once while also achieving rotational positioning of the chords. Summary of the Invention
[0003] In order to solve the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide an indexable fixture for realizing automatic drilling and milling processing of fixed-length chord rods. The rotary inner ring provided in the indexable fixture for realizing automatic drilling and milling processing of fixed-length chord rods can be rotated by a steering mechanism and fixed by an orienting mechanism, thereby realizing rotational positioning after the chord rod is installed, thereby facilitating subsequent processing and being more convenient to use.
[0004] The technical solution adopted by the indexable fixture for realizing automatic drilling and milling of fixed-length chord rods to solve the technical problems is as follows:
[0005] The invention provides an indexable fixture for realizing automatic drilling and milling of a fixed-length chord rod, comprising three groups of positioning and clamping mechanisms, namely a left positioning and clamping mechanism, a middle positioning and clamping mechanism and a right positioning and clamping mechanism. The three groups of positioning and clamping mechanisms are respectively connected to the keyway of the worktable through a guide flat key. The rotation center lines of the three groups of positioning and clamping mechanisms are coaxial and collinear. The three groups of positioning and clamping mechanisms each include a fixed outer ring, a pair of centering bearings and a rotating inner ring. Both the fixed outer ring and the rotating inner ring are top-opening structures. The fixed outer ring and the rotating inner ring are connected through a pair of centering bearings. Three rotating inner rings of the same size are respectively equipped with two positioning reference blocks, one in front and one behind. The three rotating inner rings are connected by a first connecting plate. One of the positioning and clamping mechanisms is provided with an orienting mechanism for fixing the position of the rotating inner ring. The other positioning and clamping mechanism is provided with a steering mechanism for driving the rotating inner ring to rotate. Two groups of upper pressing mechanisms and side positioning mechanisms are respectively provided on the three groups of positioning and clamping mechanisms. An axial positioning mechanism is provided on the first connecting plate and the positioning and clamping mechanism.
[0006] Furthermore, a centering clamping device is respectively arranged between the three groups of positioning and clamping mechanisms. The centering clamping device consists of a mounting seat and two clamping cylinders, one in front and one behind. The two clamping cylinders are respectively fixedly mounted on the mounting seats, and the mounting seats are connected to the keyway of the workbench through a guide flat key.
[0007] Furthermore, the directional mechanism consists of a first mounting plate, a directional cylinder, a directional rod and several directional holes. The first mounting plate is fixedly mounted on the corresponding fixed outer ring, and the several directional holes are evenly distributed on the corresponding rotating inner ring. The directional cylinder is fixedly mounted on the first mounting plate, and the movable end of the directional cylinder is fixedly connected to one end of the directional rod through the second connecting plate. The directional rod passes through the first mounting plate and is clearance-fitted. The directional rod can be inserted into the directional hole and contact-fitted.
[0008] Furthermore, there are two directional rods, and one end of each of the two directional rods is connected to the movable end of the directional oil cylinder through the same second connecting plate.
[0009] Furthermore, the steering mechanism consists of a steering motor and a gear arc rack transmission structure, the steering motor is fixedly mounted on the corresponding fixed outer ring, the gear is fixedly mounted on the output shaft of the steering motor, the arc rack is fixedly mounted on the corresponding rotating inner ring and the center lines are collinear, and the gear is meshed with the arc rack.
[0010] Furthermore, the upper clamping mechanism consists of an upper clamping cylinder, a clamping plate and a movable plate. The upper clamping cylinder is fixedly mounted on the rotating inner ring. The movable end of the upper clamping cylinder is hingedly connected to one end of the clamping plate. The middle part of the bottom surface of the clamping plate is hingedly connected to the upper end of the movable plate. The lower end of the movable plate is hingedly connected to the top surface of the upper clamping cylinder.
[0011] Furthermore, the side positioning mechanism is a side positioning cylinder, which is fixedly mounted on the rotating inner ring and arranged in the front-rear direction.
[0012] Furthermore, side thrust fixing cylinders are fixedly installed on the fixed outer rings of the left positioning clamping mechanism and the right positioning clamping mechanism respectively.
[0013] Furthermore, the axial positioning mechanism is composed of two U-shaped second mounting plates, two axial positioning cylinders, two positioning plates, two positioning bolts and a manual positioning assembly. The two second mounting plates are fixedly mounted on the front side of the first connecting plate, and the two axial positioning cylinders are fixedly mounted on the adjacent side of the second mounting plate. The movable ends of the two axial positioning cylinders face oppositely, and the two positioning plates are fixedly mounted on the rotating inner rings of the left positioning clamping mechanism and the right positioning clamping mechanism, respectively. The positioning bolts pass through the corresponding positioning plates and are threadedly engaged. The manual positioning assembly includes a rectangular positioning block, a connecting shaft, a spring and a handle. The connecting shaft passes through the right side plate of the second mounting plate on the right and is clearance-fitted. The positioning block and the handle are fixedly mounted on both ends of the connecting shaft, respectively. The spring is arranged between the handle and the second mounting plate. A slot corresponding to the shape of the positioning block is provided on the inner side of the right side plate of the second mounting plate on the right.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. An example of the present invention is a rotatable fixture for realizing automatic drilling and milling of a fixed-length chord. The axial positioning mechanism axially positions the chord through the third connecting plate and the stepping plate, and places the chord on the positioning reference blocks of the three sets of positioning clamping mechanisms. The upper pressing mechanism and the side positioning structure can respectively give the chord a downward and backward force, so that the bottom surface and the back surface of the chord are respectively aligned with the reference surface of the corresponding positioning reference block, so that the chord cannot move in the front-back direction and the up-down direction. Finally, the axial positioning mechanism can axially position the chord through the third connecting plate and the stepping plate of the chord, so that the chord The rod cannot move in the left and right directions. The rotation and fixation of the rotating inner ring can be achieved through the steering mechanism and the directional mechanism. The rotation and fixation of one rotating inner ring can make the other rotating inner rings rotate and fix through the first connecting plate, thereby driving the chord rod to rotate, and thus facilitating further processing of the chord rod. Compared with the existing chord rod clamp, the rotating inner ring provided in the present invention can be rotated by the steering mechanism and fixed by the directional mechanism, thereby realizing rotation positioning after the chord rod is installed, thereby facilitating subsequent processing and being more convenient to use.
[0016] 2. The present invention provides an indexable fixture for realizing automatic drilling and milling of a fixed-length chord. The two clamping cylinders of the centering clamping device can further center and clamp the chord, making the chord clamped and fixed more firmly.
[0017] 3. An example of the present invention is a rotatable fixture for realizing automatic drilling and milling of fixed-length chord rods. The directional mechanism consists of a first mounting plate, a directional oil cylinder, a directional rod and a plurality of directional holes. The first mounting plate is fixedly mounted on the corresponding fixed outer ring, and the plurality of directional holes are evenly distributed on the corresponding rotating inner ring. The directional oil cylinder is controlled to extend, and the directional rod can be driven to move through the second connecting plate, so that the directional rod is moved out of the directional hole. After the rotating inner ring is driven to rotate through the steering mechanism, the directional oil cylinder is controlled to contract, and the directional rod can be inserted into the directional hole aligned with it, thereby realizing orientation. The directional mechanism has a simple structure and is easy to use.
[0018] 4. An example of the present invention is a rotatable fixture for realizing automatic drilling and milling of fixed-length chord rods. The orienting mechanism consists of a first mounting plate, an orienting oil cylinder, an orienting rod and several orienting holes. The first mounting plate is fixedly mounted on the corresponding fixed outer ring, and the several orienting holes are evenly distributed on the corresponding rotating inner ring. The orienting oil cylinder is controlled to extend, and the orienting rod can be driven to move through the second connecting plate, so that the orienting rod is moved out of the orienting hole. Compared with orienting with one orienting rod, orienting with two orienting rods is more secure and can withstand greater force.
[0019] 5. An example of the present invention is a rotatable fixture for realizing automatic drilling and milling of a fixed-length chord rod, which controls the rotation of a steering motor. The rotation of the steering motor can drive the rotation of the rotating inner ring through a gear arc rack transmission structure. The structure of the steering mechanism is simple and easy to produce.
[0020] The cam is fixedly mounted on the drive means, wherein the cam is secured to the upper and lower surfaces of the drive means and the cam is secured to the upper and lower surfaces of the drive means.
[0021] 7. An example of the present invention is a rotatable fixture for realizing automatic drilling and milling of a fixed-length chord. The movable end of the side positioning cylinder contacts the front of the chord, which can give the chord a backward force, thereby causing the back of the chord to contact the side positioning surface of the positioning reference block, thereby realizing the rear positioning and fixation of the chord.
[0022] 8. The present invention provides an example of an indexable fixture for realizing automatic drilling and milling of a fixed-length chord. When drilling a hole in the end of the chord, the existing drilling equipment will give the end of the chord a forward and backward pushing force, which can easily cause the chord to separate from the positioning surface of the positioning reference block. The side push fixing cylinder can further fix the chord and share the force of the side positioning mechanism and the upper clamping mechanism.
[0023] 9. An example of the present invention is a rotatable fixture for realizing automatic drilling and milling of a fixed-length chord rod, wherein the third connecting plate on the chord rod without a tread plate is clamped between the second mounting plate on the right side, and the handle is pushed to the left to compress the spring, so that the positioning block can be pushed out of the corresponding slot. The rotating handle can drive the positioning block to rotate through the connecting shaft, thereby causing the positioning block and the slot to be misaligned. After releasing the handle, under the elastic force of the spring, the right side of the positioning block fits into the inner side of the right plate of the second mounting plate on the right side, controlling the extension of the axial positioning cylinder on the right side, and the movable end of the axial positioning cylinder contacts the left side of the third connecting plate and pushes the right side of the third connecting plate to contact the positioning block, thereby realizing the positioning of the chord rod without a tread plate. When positioning the chord rod with a tread plate, the hand needs to be rotated. The handle aligns the positioning block with the slot, and under the action of the elastic force of the spring, the positioning block is received in the slot. When the chord rod needs to be axially positioned through the left tread, it is only necessary to adjust the positioning bolt on the left to control the extension of the axial positioning cylinder on the left. The axial positioning cylinder on the left can push the chord rod to the left through the third connecting plate, thereby enabling the left tread to contact the positioning bolt on the left, thereby realizing the chord rod positioning of the left tread. Conversely, if the chord rod needs to be axially positioned through the right tread, according to the above description, it is sufficient to adjust the positioning bolt and the axial positioning cylinder on the right. The axial positioning mechanism can respectively position the chord rods with and without treads, and can perform chord rod positioning work on treads in different positions, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:
[0025] Figure 1 It is a schematic diagram of the mechanism of the present invention;
[0026] Figure 2 This is a schematic diagram of the present invention in use;
[0027] Figure 3 This is a schematic diagram of the positioning and clamping mechanism of the present invention from the right side;
[0028] Figure 4This is a schematic diagram of the left side of the right positioning and clamping mechanism of the present invention;
[0029] Figure 5 It is a partial front view of the present invention;
[0030] Figure 6 Schematic diagram of the chord structure.
[0031] In the figure: 1 left positioning clamping mechanism; 2 middle positioning clamping mechanism; 3 right positioning clamping mechanism; 4 workbench; 5 fixed outer ring; 6 pair of centering bearings; 7 rotary inner ring; 8 positioning reference block; 9 first connecting plate; 10 centering clamping device; 11 first mounting plate; 12 directional cylinder; 13 directional rod; 14 directional hole; 15 steering motor; 16 upper clamping cylinder; 17 clamping plate; 18 movable plate; 19 side positioning cylinder; 20 side push fixing cylinder; 21 second mounting plate; 22 axial positioning cylinder; 23 positioning plate; 24 positioning bolt; 25 positioning block; 26 connecting shaft; 27 spring; 28 handle. DETAILED DESCRIPTION
[0032] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.
[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0034] like Figure 1-6As shown, an indexable fixture for realizing automatic drilling and milling of a fixed-length chord rod comprises three groups of positioning and clamping mechanisms, namely, a left positioning and clamping mechanism 1, a middle positioning and clamping mechanism 2 and a right positioning and clamping mechanism 3. The three groups of positioning and clamping mechanisms are connected to the keyways of a workbench 4 through guide flat keys respectively. The rotation center lines of the three groups of positioning and clamping mechanisms are coaxial and collinear. The three groups of positioning and clamping mechanisms all comprise a fixed outer ring 5, a pair of centering bearings 6 and a rotating inner ring 7. Both the fixed outer ring 5 and the rotating inner ring 7 have top surface opening structures. The fixed outer ring 5 and the rotating inner ring 7 are connected through a pair of centering bearings 6. The three rotating inner rings 7 of the same size are respectively equipped with There are two positioning reference blocks 8, one in front and one behind. The positioning reference block 8 is an L-shaped structure. There are bottom positioning surfaces and side positioning surfaces on the positioning reference block 8. The three rotating inner rings 7 are connected by a first connecting plate 9. One of the positioning clamping mechanisms is provided with a directional mechanism for fixing the position of the rotating inner ring 7, and the other positioning clamping mechanism is provided with a steering mechanism for driving the rotating inner ring 7 to rotate. The three groups of positioning clamping mechanisms are respectively provided with two groups of upper clamping mechanisms and side positioning mechanisms. The upper clamping mechanism can give the chord a downward force, and the side positioning mechanism can give the chord a backward force. The first connecting plate 9 and the positioning clamping mechanism are provided with an axial positioning mechanism. The axial positioning mechanism axially positions the chord through the third connecting plate and the tread plate, and places the chord on the positioning reference block 8 of the three sets of positioning clamping mechanisms. The upper pressing mechanism and the side positioning structure can respectively give the chord a downward and backward force, so that the bottom surface and the back surface of the chord are respectively aligned with the reference surface of the corresponding positioning reference block 8, so that the chord cannot move in the front-back direction and the up-down direction. Finally, the axial positioning mechanism can axially position the chord through the third connecting plate and the tread plate of the chord, so that the chord cannot move in the left-right direction. The rotation and fixation of the rotating inner ring 7 can be achieved through the steering mechanism and the orientation mechanism. The rotation and fixation of one rotating inner ring 7 can rotate and fix the other rotating inner rings 7 through the first connecting plate 9, thereby driving the chord to rotate, thereby facilitating further processing of the chord. Compared with the existing chord clamp, the rotating inner ring 7 provided in the present invention can be rotated by the steering mechanism and fixed by the orientation mechanism, thereby achieving rotational positioning after the chord is installed, thereby facilitating subsequent processing and being more convenient to use.
[0035] like Figure 1 and 2As shown, further preferably, a centering clamping device 10 is provided between each of the three positioning and clamping mechanisms. The centering clamping device 10 comprises a mounting base and two clamping cylinders, one in front and one behind. The two clamping cylinders are fixedly mounted on the mounting base, and the mounting bases are connected to the keyway of the workbench 4 via a guide flat key. The two clamping cylinders of the centering clamping device 10 can further center and clamp the chord rod, making the chord rod clamped and fixed more firmly.
[0036] like Figure 4 As shown, further preferably, the directional mechanism consists of a first mounting plate 11, a directional cylinder 12, a directional rod 13 and several directional holes 14. The first mounting plate 11 is fixedly mounted on the corresponding fixed outer ring 5, and several directional holes 14 are evenly distributed on the rotating inner ring 7. The directional cylinder 12 is fixedly mounted on the first mounting plate 11, and the movable end of the directional cylinder 12 is fixedly connected to one end of the directional rod 13 through the second connecting plate. The directional rod 13 passes through the first mounting plate 11 and is clearance-fitted. The directional rod 13 can be inserted into the directional hole 14 and contact-fitted. The orientation mechanism is composed of a first mounting plate 11, an orientation cylinder 12, an orientation rod 13 and several orientation holes 14. The first mounting plate 11 is fixedly mounted on the corresponding fixed outer ring 5, and several orientation holes 14 are evenly distributed on the rotating inner ring 7. The orientation cylinder 12 is controlled to extend, and the orientation rod 13 can be driven to move through the second connecting plate, so that the orientation rod 13 is moved out of the orientation hole 14. After the rotating inner ring 7 is driven to rotate by the steering mechanism, the orientation cylinder 12 is controlled to contract, and the orientation rod 13 can be inserted into the orientation hole 14 aligned with it, thereby achieving orientation. The orientation mechanism has a simple structure and is easy to use.
[0037] like Figure 4 As shown, further preferably, there are two directional rods 13, one end of each of the two directional rods 13 is connected to the movable end of the directional oil cylinder 12 through the same second connecting plate, and the other end of each of the directional rods 13 is a truncated cone structure, which facilitates the insertion of the directional rods 13 into the corresponding directional holes 14. The directional mechanism is composed of a first mounting plate 11, a directional oil cylinder 12, a directional rod 13 and a plurality of directional holes 14. The first mounting plate 11 is fixedly mounted on the corresponding fixed outer ring 5, and the plurality of directional holes 14 are evenly distributed on the rotating inner ring 7. The directional oil cylinder 12 is controlled to extend, and the directional rods 13 can be driven to move through the second connecting plate, so that the directional rods 13 are moved out of the directional holes 14. Compared with the directional mechanism using one directional rod 13, the directional mechanism using two directional rods 13 is more secure and can withstand greater forces.
[0038] like Figure 3As shown, further preferably, the steering mechanism comprises a steering motor 15 and a gear arc-shaped rack transmission structure. The steering motor 15 is fixedly mounted on the corresponding fixed outer ring 5, the gear is fixedly mounted on the output shaft of the steering motor 15, and the arc-shaped rack is fixedly mounted on the corresponding rotating inner ring 7 with the center lines of the circles collinear. The gear and the arc-shaped rack mesh with each other. Controlling the rotation of the steering motor 15 drives the rotating inner ring 7 to rotate via the gear arc-shaped rack transmission structure. This steering mechanism has a simple structure and is easy to manufacture.
[0039] like Figure 3 and 4 As shown, it is further preferred that the upper clamping mechanism consists of an upper clamping cylinder 16, a clamping plate 17 and a movable plate 18. The upper clamping cylinder 16 is fixedly mounted on the rotating inner ring 7. The movable end of the upper clamping cylinder 16 is hingedly connected to one end of the clamping plate 17. The middle part of the bottom surface of the clamping plate 17 is hingedly connected to the upper end of the movable plate 18. The lower end of the movable plate 18 is hingedly connected to the top surface of the upper clamping cylinder 16. The upper clamping mechanisms are arranged one in front and one behind on the rotating inner ring 7. The two groups of upper clamping mechanisms can respectively press down and position the front and rear parts of the top surface of the chord. By controlling the extension of the movable end of the upper clamping cylinder 16, one end of the clamping plate 17 can be lifted upward for a certain distance, thereby causing the other end of the clamping plate 17 to move downward, and then the bottom surface of the other end of the clamping plate 17 can be brought into contact with the top surface of the chord, thereby giving the chord a downward force, so that the bottom surface of the chord is brought into contact with the bottom positioning surface of the positioning reference block 8, thereby realizing the bottom positioning and fixation of the chord.
[0040] like Figure 1 As shown, further preferably, the side positioning mechanism is a side positioning cylinder 19, which is fixedly mounted on the rotating inner ring 7 and arranged in the front-to-back direction. The movable end of the side positioning cylinder 19 contacts the front of the chord, which can apply a backward force to the chord, thereby causing the rear of the chord to contact the side positioning surface of the positioning reference block 8, thereby achieving the rear positioning and fixation of the chord.
[0041] like Figure 1 and 2 As shown, further preferably, a side-thrust fixing cylinder 20 is fixedly installed on the fixed outer ring 5 of the left positioning clamping mechanism 1 and the right positioning clamping mechanism 3. When drilling, existing drilling equipment will apply a forward and backward pushing force to the end of the chord, which easily causes the chord to separate from the positioning surface of the positioning reference block 8. The side-thrust fixing cylinder 20 can further fix the chord and share the force of the side positioning mechanism and the upper clamping mechanism.
[0042] like Figure 4 and 5As shown, further preferably, the axial positioning mechanism is composed of two U-shaped second mounting plates 21, two axial positioning cylinders 22, two positioning plates 23, two positioning bolts 24 and a manual positioning assembly. The two second mounting plates 21 are fixedly mounted on the front side of the first connecting plate 9, and the two axial positioning cylinders 22 are respectively fixedly mounted on the adjacent side of the second mounting plate 21. The movable ends of the two axial positioning cylinders 22 face oppositely, and the two positioning plates 23 are respectively fixedly mounted on the rotating inner ring 7 of the left positioning clamping mechanism 1 and the right positioning clamping mechanism 3. The positioning bolts 24 are fixedly mounted on the left positioning clamping mechanism 1 and the right positioning clamping mechanism 3. The bolts 24 pass through the corresponding positioning plates 23 and are threaded together. The bolt heads of the positioning bolts 24 are located on the opposite sides of the two positioning plates 23. The manual positioning assembly includes a rectangular positioning block 25, a connecting shaft 26, a spring 27 and a handle 28. The connecting shaft 26 passes through the right side plate of the second mounting plate 21 on the right and is clearance-fitted. The positioning block 25 and the handle 28 are fixedly mounted on both ends of the connecting shaft 26 respectively. The spring 27 is arranged between the handle 28 and the second mounting plate 21. A slot corresponding to the shape of the positioning block 25 is opened on the inner side of the right side plate of the second mounting plate 21 on the right. The third connecting plate on the chord without the tread is inserted between the second mounting plate 21 on the right side, and the handle 28 is pushed to the left to compress the spring 27, which can push the positioning block 25 out of the corresponding slot. The rotating handle 28 can drive the positioning block 25 to rotate through the connecting shaft 26, thereby making the positioning block 25 and the slot misaligned. After releasing the handle 28, under the elastic force of the spring 27, the right side of the positioning block 25 fits with the inner side of the right side plate of the second mounting plate 21 on the right side, controlling the extension of the axial positioning cylinder 22 on the right side. The movable end of the axial positioning cylinder 22 contacts the left side of the third connecting plate and pushes the right side of the third connecting plate to contact the positioning block 25, thereby realizing the positioning of the chord without the tread. When the chord with the tread is positioned, the handle 28 needs to be rotated to make the positioning block 25 Aligned with the slot, the positioning block 25 is retracted into the slot under the elastic force of the spring 27. When the chord rod needs to be axially positioned through the left tread, it is only necessary to adjust the positioning bolt 24 on the left to control the extension of the axial positioning cylinder 22 on the left. The axial positioning cylinder 22 on the left can push the chord rod to the left through the third connecting plate, thereby enabling the left tread to contact the positioning bolt 24 on the left, thereby achieving the chord rod positioning work of the left tread. Conversely, if the chord rod needs to be axially positioned through the right tread, according to the above description, it is sufficient to adjust the positioning bolt 24 and the axial positioning cylinder 22 on the right. This axial positioning mechanism can respectively position the chord rods with and without treads, and can position the chord rods of treads in different positions, and has strong applicability.
[0043] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.
[0044] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.
Claims
1. An indexable fixture for realizing automatic drilling and milling of a fixed-length chord, comprising three sets of positioning and clamping mechanisms, the three sets of positioning and clamping mechanisms being a left positioning and clamping mechanism (1), a middle positioning and clamping mechanism (2) and a right positioning and clamping mechanism (3), characterized in that: The three groups of positioning clamping mechanisms are connected to the keyway of the workbench (4) through the guide flat key respectively. The rotation center lines of the three groups of positioning clamping mechanisms are coaxial and collinear. The three groups of positioning clamping mechanisms all include a fixed outer ring (5), a pair of centering bearings (6) and a rotating inner ring (7). The fixed outer ring (5) and the rotating inner ring (7) are both top surface open structures. The fixed outer ring (5) and the rotating inner ring (7) are connected through the pair of centering bearings (6). Three rotating inner rings (7) of the same size are respectively equipped with two positioning reference blocks (8) one in front and one behind. The three rotating inner rings (7) are connected through the first connecting plate (9). One of the positioning clamping mechanisms is provided with an orientation mechanism for fixing the position of the rotating inner ring (7). The other positioning clamping mechanism is provided with a steering mechanism for driving the rotating inner ring (7) to rotate. The three groups of positioning clamping mechanisms are respectively provided with two groups of upper pressing mechanisms and side positioning mechanisms. The first connecting plate (9) and the positioning clamping mechanism are provided with an axial positioning mechanism. A centering clamping device (10) is provided between the three groups of positioning and clamping mechanisms. The centering clamping device (10) is composed of a mounting seat and two clamping cylinders, one in front and one behind. The two clamping cylinders are fixedly mounted on the mounting seat, and the mounting seat is connected to the keyway of the workbench (4) through a guide flat key. The orientation mechanism is composed of a first mounting plate (11), an orientation oil cylinder (12), an orientation rod (13) and a plurality of orientation holes (14). The first mounting plate (11) is fixedly mounted on the corresponding fixed outer ring (5). The plurality of orientation holes (14) are evenly distributed on the corresponding rotary inner ring (7). The orientation oil cylinder (12) is fixedly mounted on the first mounting plate (11). The movable end of the orientation oil cylinder (12) is fixedly connected to one end of the orientation rod (13) through the second connecting plate. The orientation rod (13) passes through the first mounting plate (11) and is clearance-fitted. The orientation rod (13) can be inserted into the orientation hole (14) and is contact-fitted. The axial positioning mechanism is composed of two U-shaped second mounting plates (21), two axial positioning oil cylinders (22), two positioning plates (23), two positioning bolts (24) and a manual positioning assembly. The two second mounting plates (21) are fixedly mounted on the front side of the first connecting plate (9). The two axial positioning oil cylinders (22) are respectively fixedly mounted on the adjacent sides of the second mounting plates (21). The movable ends of the two axial positioning oil cylinders (22) face oppositely. The two positioning plates (23) are respectively fixedly mounted on the rotating inner rings (7) of the left positioning clamping mechanism (1) and the right positioning clamping mechanism (3). The positioning bolts (24) respectively pass through the corresponding positioning plates (23) and are threaded together. The manual positioning assembly includes a rectangular positioning block (25), a connecting shaft (26), a spring (27) and a handle (28). The connecting shaft (26) passes through the right side plate of the second mounting plate (21) on the right side and is clearance-fitted. The positioning block (25) and the handle (28) are respectively fixedly mounted on the two ends of the connecting shaft (26). The spring (27) is arranged between the handle (28) and the second mounting plate (21). A slot corresponding to the shape of the positioning block (25) is opened on the inner side of the right side plate of the second mounting plate (21) on the right side.
2. The indexable fixture for realizing automatic drilling and milling of fixed-length chord rods according to claim 1 is characterized in that: There are two directional rods (13), and one end of each of the two directional rods (13) is connected to the movable end of the directional oil cylinder (12) through the same second connecting plate.
3. The indexable fixture for realizing automatic drilling and milling of fixed-length chord rods according to claim 1 is characterized in that: The steering mechanism is composed of a steering motor (15) and a gear arc rack transmission structure, wherein the steering motor (15) is fixedly mounted on the corresponding fixed outer ring (5), the gear is fixedly mounted on the output shaft of the steering motor (15), the arc rack is fixedly mounted on the corresponding rotating inner ring (7) and the center lines of the circles are collinear, and the gear is meshed with the arc rack.
4. The indexable fixture for realizing automatic drilling and milling of fixed-length chord rods according to claim 1 is characterized in that: The upper clamping mechanism is composed of an upper clamping cylinder (16), a clamping plate (17) and a movable plate (18). The upper clamping cylinder (16) is fixedly mounted on the rotary inner ring (7). The movable end of the upper clamping cylinder (16) is hingedly connected to one end of the clamping plate (17). The middle of the bottom surface of the clamping plate (17) is hingedly connected to the upper end of the movable plate (18). The lower end of the movable plate (18) is hingedly connected to the top surface of the upper clamping cylinder (16).
5. The indexable fixture for realizing automatic drilling and milling of fixed-length chord rods according to claim 1 is characterized in that: The side positioning mechanism is a side positioning oil cylinder (19), which is fixedly mounted on the rotary inner ring (7) and arranged in a front-to-back direction.
6. The indexable fixture for realizing automatic drilling and milling of fixed-length chord rods according to claim 1 is characterized in that: The side push fixing oil cylinder (20) is fixedly mounted on the fixed outer ring (5) of the left positioning clamping mechanism (1) and the right positioning clamping mechanism (3), respectively.
Citation Information
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