A clamping device for milling of centrifugal blower impeller

Abstract

The invention relates to the technical field of blower impeller processing, and discloses a clamping device for the milling processing of a centrifugal blower impeller, comprising a chassis, on which a first positioning mechanism is arranged; the first positioning mechanism comprises a first three-jaw chuck arranged in the middle of the chassis, on which three first claws are slidably arranged; an axial hole is opened in the middle of an impeller blank, and a second positioning mechanism is also arranged on the chassis, the second positioning mechanism comprises a second three-jaw chuck arranged in the chassis, on which three second claws are slidably arranged, and each of the three second claws is provided with a first support arm; the clamping device for the milling processing of a centrifugal blower impeller improves the positioning stability of the blank by performing triple reinforcement on three points at the edge of the impeller blank, three points at the axial hole of the blank, and points at the keyway of the blank, thereby improving the precision of the milling processing of the centrifugal blower impeller.

Description

Technical Field

[0001] The invention relates to the technical field of blower impeller processing, in particular to a clamping device for milling a centrifugal blower impeller. Background Art

[0002] Centrifugal blowers use the centrifugal force generated by a working impeller equipped with many blades to squeeze air to achieve a certain air volume and air pressure. The impeller of a centrifugal blower is usually milled by a five-axis high-precision machine tool. When milling the impeller, a clamping device is required to position the impeller blank. Generally, a hydraulic chuck is used for clamping. The three jaws of the hydraulic chuck move synchronously to clamp and fix the edge of the circular blank.

[0003] However, due to the extremely high machining precision required for the milling of the impeller and the high requirements for positioning stability, the fixing stability of the positioning method that only clamps three points on the edge of the impeller blank still needs to be improved.

[0004] Therefore, in order to solve the above technical problems existing in the prior art, a clamping device for the milling processing of a centrifugal blower impeller is proposed. Summary of the invention

[0005] The present invention provides a clamping device for the milling of centrifugal blower impellers, which has the beneficial effect of improving the positioning stability of the blank by performing triple reinforcement on three points at the edge of the impeller blank, three points at the axial hole of the blank and the keyway of the blank, thereby improving the precision of the milling of the centrifugal blower impeller. It solves the problem mentioned in the above background technology that the milling of the impeller requires extremely high machining accuracy and high requirements for positioning stability, and the fixing stability of the positioning method that only clamps the three points on the edge of the impeller blank still needs to be improved.

[0006] The present invention provides the following technical solution: a clamping device for the milling of a centrifugal blower impeller, used for fixing an impeller blank, the clamping device for the milling of a centrifugal blower impeller comprising a chassis, and a first positioning mechanism is arranged on the chassis;

[0007] The first positioning mechanism comprises a first three-jaw chuck arranged in the middle of the chassis, and three first jaws are slidably arranged on the first three-jaw chuck, and the three first jaws are synchronously moved radially toward the center of the first three-jaw chuck until the three first jaws abut against the edge of the impeller blank, thereby fixing the impeller blank;

[0008] An axial hole is opened in the middle of the impeller blank, and a second positioning mechanism is also arranged on the chassis. The second positioning mechanism includes a second three-jaw chuck arranged in the chassis, and three second claws are slidably arranged on the second three-jaw chuck. The three second claws are respectively provided with a first support arm, and the three first support arms are driven by the three second claws to synchronously move radially away from the center direction of the first three-jaw chuck until the three first support arms are against the inner wall of the axial hole to fix the impeller blank.

[0009] As an optional solution of the clamping device for the milling of the centrifugal blower impeller of the present invention, wherein: the impeller blank is also provided with a keyway, the keyway is connected to the shaft hole, and the chassis is also provided with a third positioning mechanism;

[0010] The third positioning mechanism includes two second support arms, which are L-shaped. The two second support arms are respectively arranged on two of the first support arms. The three first support arms drive the two second support arms to press against the inner wall of the keyway to fix the impeller blank.

[0011] As an optional solution of the clamping device for milling the centrifugal blower impeller described in the present invention, one of the second support arms is provided with a connecting block, and the other second support arm is provided with a connecting groove, and the connecting block is slidably connected in the connecting groove.

[0012] As an optional solution of the clamping device for milling the impeller of a centrifugal blower described in the present invention, wherein: a driving mechanism is also provided on the chassis, and the driving mechanism is used to drive the second positioning mechanism and the third positioning mechanism to rise and fall along the shaft hole;

[0013] The driving mechanism includes a lifting seat slidably arranged in the chassis, a hydraulic cylinder is arranged in the chassis, a piston rod of the hydraulic cylinder is connected to the lifting seat, a circular rotating groove is provided on the lifting seat, a rotating seat is rotatably arranged in the circular rotating groove, the second three-jaw chuck is installed on the rotating seat, three first linear sliding grooves are circumferentially provided on the rotating seat, and the three first support arms are slidably connected to the three first linear sliding grooves respectively.

[0014] As an optional solution of the clamping device for milling the impeller of a centrifugal blower of the present invention, wherein: the driving mechanism further comprises a positioning assembly, and the positioning assembly is used to position the keyway;

[0015] The positioning assembly includes a connecting seat arranged on the lifting seat, and a plurality of first arc-shaped sliding blocks are arranged on the connecting seat, and the plurality of first arc-shaped sliding blocks are arranged equidistantly in the circumferential direction based on the center of the shaft hole.

[0016] As an optional scheme of the clamping device for milling processing of a centrifugal blower impeller described in the present invention, wherein: the upper end of the first arc-shaped slider is an inclined surface inclined from the side close to the center of the shaft hole to the side away from the center of the shaft hole, the heights of several first arc-shaped sliders decrease in the clockwise direction, and the curvature of the first arc-shaped slider is less than half of the curvature of the keyway.

[0017] As an optional solution of the clamping device for milling the impeller of a centrifugal blower described in the present invention, the positioning assembly also includes a plurality of second linear slide grooves circumferentially opened on the connecting seat, a plurality of the first arc-shaped sliding blocks are each provided with a slide rod, a plurality of the slide rods are respectively slidably connected to a plurality of the second linear slide grooves, and a plurality of the slide rods are respectively elastically connected to the inner walls of a plurality of the second linear slide grooves through a plurality of springs.

[0018] As an optional solution of the clamping device for milling the impeller of a centrifugal blower described in the present invention, wherein: the positioning assembly also includes a plurality of second arc-shaped sliders respectively arranged on the plurality of first arc-shaped sliders, the connecting seat is provided with an annular slide groove, a third arc-shaped slider is slidably arranged in the annular slide groove, and the third arc-shaped slider is located on the inner side of the plurality of second arc-shaped sliders;

[0019] In the process of the hydraulic cylinder driving several of the first arc-shaped sliders to rise and contact the bottom end of the impeller blank, several of the first arc-shaped sliders and several of the second arc-shaped sliders outside the lower side range of the keyway are pushed to the inside of the shaft hole, and then the third arc-shaped slider is pushed into the lower side range of the keyway to position the keyway.

[0020] As an optional solution of the clamping device for milling a centrifugal blower impeller described in the present invention, the positioning assembly further includes a fourth arc-shaped slider disposed on the swivel seat, and the fourth arc-shaped slider is connected to the third arc-shaped slider.

[0021] As an optional scheme of the clamping device for milling the centrifugal blower impeller described in the present invention, wherein: the curvature of the fourth arc-shaped slider is equal to the curvature of the keyway, and in the process of the hydraulic cylinder driving the fourth arc-shaped slider to rise and contact the bottom end of the impeller blank, the fourth arc-shaped slider and the are pushed to fit with the keyway, and the fourth arc-shaped slider then drives the two second support arms to rotate to a position aligned with the keyway.

[0022] The present invention has the following beneficial effects:

[0023] 1. The clamping device for the milling of the impeller of the centrifugal blower, in addition to positioning the edge of the lower plate of the impeller blank, is further provided with three first support arms that can be raised and lowered along the axial hole in the middle of the impeller blank. The three first support arms can be driven by the second three-jaw chuck to move in radial expansion, so that the three first support arms are against three equidistant points on the inner wall of the axial hole, which plays a role in reinforcing the impeller blank, and improves the precision of the milling of the impeller of the centrifugal blower by improving the positioning stability.

[0024] 2. The clamping device for the milling of the impeller of the centrifugal blower also takes into account that some shaft holes may be provided with keyways for key connection with the shaft. In order to avoid interference of the keyways with the supporting points of the first supporting arms, two L-shaped second supporting arms are installed on two of the first supporting arms. While the three first supporting arms are against three equidistant points on the inner wall of the shaft hole, the two second supporting arms will expand and against the three sides of the keyway, thereby further strengthening the impeller blank.

[0025] 3. The clamping device for the milling of the centrifugal blower impeller can automatically locate the keyway through the positioning assembly when the three first support arms and the two second support arms are lifted upward along the shaft hole. This simplifies the operation process. The impeller blank only needs to be roughly placed at the center of the chassis to first fix the three equidistant points on the edge of the lower plate and locate the center of the impeller blank, then automatically determine the keyway position, and finally complete the support of the three equidistant points on the inner wall of the shaft hole and the three sides of the keyway. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 It is a schematic diagram of the explosion structure of the blank in the present invention.

[0028] Figure 3 It is a schematic diagram of the partial cross-sectional structure of the chassis in the present invention.

[0029] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0030] Figure 5 It is a first cross-sectional structural schematic diagram of the driving mechanism in the present invention.

[0031] Figure 6 It is a second cross-sectional structural schematic diagram of the driving mechanism in the present invention.

[0032] Figure 7It is a schematic diagram of the explosion structure of the driving mechanism in the present invention.

[0033] Figure 8 It is a schematic diagram of the exploded structure of the third positioning mechanism in the present invention.

[0034] Fig. 9 It is a schematic diagram of the first working principle of the present invention.

[0035] Fig.10 It is a schematic diagram of the second working principle of the present invention.

[0036] In the figure: 100, impeller blank; 110, shaft hole; 120, keyway; 200, chassis; 300, first positioning mechanism; 310, first three-jaw chuck; 320, first clamping claw; 400, second positioning mechanism; 410, second three-jaw chuck; 420, second clamping claw; 430, first support arm; 500, third positioning mechanism; 510, second support arm; 520, connecting block; 530, connecting groove; 60 0. Driving mechanism; 610. Lifting seat; 620. Hydraulic cylinder; 630. Circular rotating groove; 640. Rotating seat; 650. First linear sliding groove; 660. Positioning assembly; 661. Connecting seat; 662. First arc-shaped slider; 663. Second linear sliding groove; 664. Sliding rod; 665. Spring; 666. Second arc-shaped slider; 667. Annular sliding groove; 668. Third arc-shaped slider; 669. Fourth arc-shaped slider. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] For example, see Figure 1-Figure 8 A clamping device for milling a centrifugal blower impeller is used to fix an impeller blank 100. The clamping device for milling a centrifugal blower impeller comprises a chassis 200, and a first positioning mechanism 300 is arranged on the chassis 200;

[0039] The first positioning mechanism 300 includes a first three-jaw chuck 310 disposed in the middle of the chassis 200, and three first clamping jaws 320 are slidably disposed on the first three-jaw chuck 310. The three first clamping jaws 320 synchronously move radially toward the center of the first three-jaw chuck 310 until the three first clamping jaws 320 abut against the edge of the impeller blank 100, thereby fixing the impeller blank 100.

[0040] An axial hole 110 is opened in the middle of the impeller blank 100, and a second positioning mechanism 400 is also arranged on the chassis 200. The second positioning mechanism 400 includes a second three-jaw chuck 410 arranged in the chassis 200, and three second claws 420 are slidably arranged on the second three-jaw chuck 410. The three second claws 420 are all provided with a first support arm 430. The three first support arms 430 are driven by the three second claws 420 to synchronously move radially away from the center direction of the first three-jaw chuck 310 until the three first support arms 430 are against the inner wall of the axial hole 110 to fix the impeller blank 100.

[0041] In this embodiment: the chassis 200 is the base of the clamping device, which is used to fix and position the impeller blank 100. The chassis 200 itself can also be rotated, swung, and moved on a five-axis machining center for impeller milling to cooperate with milling.

[0042] After the impeller blank 100 is placed near the middle position of the chassis 200, the first three-jaw chuck 310 drives the three first jaws 320 to move radially toward the center of the chassis 200 synchronously until the three first jaws 320 hit three points on the edge of the lower plate of the impeller blank 100. The operation of the first three-jaw chuck 310 is stopped. At this time, the impeller blank 100 is fixed in the middle position of the chassis 200, and the positioning of the impeller blank 100 is completed.

[0043] Then, further, by lifting the second three-jaw chuck 410 upward as a whole, the three first support arms 430 are lifted upward and inserted into the shaft hole 110, and then the second three-jaw chuck 410 is operated to drive the three second jaws 420 to move radially toward the inner wall of the shaft hole 110 synchronously until the three second jaws 420 hit three points on the inner wall of the shaft hole 110, and then the second three-jaw chuck 410 is stopped to complete the reinforcement of the impeller blank 100.

[0044] It should be supplemented that the first three-jaw chuck 310 and the second three-jaw chuck 410 can be hydraulically driven, and a hydraulic cylinder stroke detector or a pressure sensor can be installed to control the force of the first jaw 320 to clamp the impeller blank 100 to a set value. The specific structure and working principle of the first three-jaw chuck 310 and the second three-jaw chuck 410 are conventional technical means and are not described in detail.

[0045] Embodiment 2: This embodiment is an improvement on Embodiment 1. For details, please refer to Figure 1-Figure 8 The impeller blank 100 is also provided with a keyway 120, the keyway 120 is connected to the shaft hole 110, and the chassis 200 is also provided with a third positioning mechanism 500;

[0046] The third positioning mechanism 500 includes two second support arms 510, which are L-shaped. The two second support arms 510 are respectively arranged on two of the first support arms 430. The three first support arms 430 drive the two second support arms 510 to press against the inner wall of the key slot 120 to fix the impeller blank 100.

[0047] A connecting block 520 is disposed on one of the second supporting arms 510 , and a connecting groove 530 is formed on the other second supporting arm 510 . The connecting block 520 is slidably connected in the connecting groove 530 .

[0048] In this embodiment, considering that the impeller is usually mounted on the shaft, and the impeller and the shaft are usually connected by a key, a rectangular keyway 120 is provided at the edge of the shaft hole 110. Due to the presence of the keyway 120, when the impeller blank 100 is slightly displaced during the milling process, the contact point between the first support arm 430 and the shaft hole 110 may interfere with the keyway 120, affecting the clamping effect of the first support arm 430.

[0049] Therefore, a third positioning mechanism 500 is further provided. When the three first support arms 430 are expanded and moved, Figure 8 As shown, the axis of one of the first support arms 430 is in the left-right direction, and the axes of the other two first support arms 430 form an angle of 120° with the axis. The first support arm 430 located on the upper right side drives the second support arm 510 connected thereto to move toward the upper right side, and the first support arm 430 located on the lower right side drives the second support arm 510 connected thereto to move toward the lower right side. The two second support arms 510 will be driven to extend into the key slot 120 and contact the inner wall of the key slot 120, thereby playing a reinforcing role.

[0050] Finally Figure 1 As shown, three equidistant points on the inner wall of the shaft hole 110 and three sides of the keyway 120 are all fixed.

[0051] Embodiment 3: This embodiment is an improvement made on the basis of Embodiment 1. For details, please refer to Figure 2-Figure 7 The chassis 200 is also provided with a driving mechanism 600, and the driving mechanism 600 is used to drive the second positioning mechanism 400 and the third positioning mechanism 500 to rise and fall along the shaft hole 110;

[0052] The driving mechanism 600 includes a lifting seat 610 slidably arranged in the chassis 200, a hydraulic cylinder 620 is arranged in the chassis 200, the piston rod of the hydraulic cylinder 620 is connected to the lifting seat 610, a circular rotating groove 630 is opened on the lifting seat 610, a rotating seat 640 is rotatably arranged in the circular rotating groove 630, the second three-jaw chuck 410 is installed on the rotating seat 640, three first linear slide grooves 650 are opened circumferentially on the rotating seat 640, and the three first support arms 430 are respectively slidably connected in the three first linear slide grooves 650.

[0053] In this embodiment: the operation of the hydraulic cylinder 620 can drive the lifting seat 610 to rise and fall, and then drive the rotating seat 640 and the second three-jaw chuck 410 to rise and fall. The positions of the second three-jaw chuck 410 and the three first support arms 430 can be adjusted as the rotating seat 640 rotates.

[0054] Embodiment 4: This embodiment is an improvement on Embodiment 3. For details, please refer to Figure 2-Figure 9 , the driving mechanism 600 further includes a positioning assembly 660, and the positioning assembly 660 is used to position the key slot 120;

[0055] The positioning assembly 660 includes a connecting seat 661 disposed on the lifting seat 610, and a plurality of first arc-shaped sliders 662 are disposed on the connecting seat 661. The plurality of first arc-shaped sliders 662 are equidistantly arranged in the circumferential direction based on the center of the shaft hole 110;

[0056] The upper end of the first arc-shaped slider 662 is an inclined surface inclined from a side close to the center of the shaft hole 110 to a side away from the center of the shaft hole 110, and the height of the first arc-shaped sliders 662 decreases in the clockwise direction, and the curvature of the first arc-shaped sliders 662 is less than half of the curvature of the key slot 120;

[0057] The positioning assembly 660 further includes a plurality of second linear slide grooves 663 circumferentially arranged on the connecting seat 661, and a plurality of first arc-shaped sliders 662 are each provided with a slide rod 664, and the plurality of slide rods 664 are respectively slidably connected in the plurality of second linear slide grooves 663, and the plurality of slide rods 664 are respectively elastically connected to the inner walls of the plurality of second linear slide grooves 663 through a plurality of springs 665;

[0058] The positioning assembly 660 further includes a plurality of second arc-shaped sliders 666 respectively disposed on the plurality of first arc-shaped sliders 662. An annular slide groove 667 is provided on the connecting seat 661. A third arc-shaped slider 668 is slidably disposed in the annular slide groove 667. The third arc-shaped slider 668 is located on the inner side of the plurality of second arc-shaped sliders 666.

[0059] In the process of the hydraulic cylinder 620 driving several first arc-shaped sliders 662 to rise and contact the bottom end of the impeller blank 100, several first arc-shaped sliders 662 and several second arc-shaped sliders 666 outside the lower side range of the keyway 120 are pushed to the inner side of the shaft hole 110, and then the third arc-shaped slider 668 is pushed to the lower side range of the keyway 120 to position the keyway 120.

[0060] In this embodiment, in order to make the two second support arms 510 able to abut against the three sides of the key slot 120, the positioning assembly 660 is required to position the key slot 120. The connecting seat 661 is connected to the lifting seat 610, and a plurality of 622 are respectively distributed along a plurality of radial directions of the connecting seat 661, and the first arc-shaped slider 662 is set as an inclined surface that tilts downward from the inner side of the shaft hole 110 to the outer side.

[0061] The thickness of the first arc-shaped slider 662 is set so that the circular contour of the inner wall of the shaft hole 110 can be projected downward to the middle position of the first arc-shaped slider 662. The height of the first arc-shaped sliders 662 gradually decreases in the clockwise direction, and the slide bars 664 slide along the second linear slide grooves 663, which are the radial directions of the shaft hole 110. The spring 665 plays an elastic supporting role for the first arc-shaped slider 662.

[0062] like Fig. 9 As shown, a represents the arc of the keyway 120 calculated from the center of the shaft hole 110, and b represents the arc of the first arc slider 662. The second arc slider 666 is installed on the inner ring of the first arc slider 662. The arc of the second arc slider 666 is the same as that of the first arc slider 662.

[0063] When the connecting seat 661 is driven to rise by the hydraulic cylinder 620, if the highest first arc-shaped slider 662 is within the key slot 120, the first arc-shaped slider 662 does not contact the inner wall of the shaft hole 110, and then the second highest first arc-shaped slider 662 is moved, until the first first arc-shaped slider 662 that can contact the bottom end of the shaft hole 110 is moved, and the first first arc-shaped slider 662 and the second arc-shaped slider 666 connected thereto are pushed to the inside of the shaft hole 110, and at this time, the outer ring of the first arc-shaped slider 662 is pressed against the inner wall of the shaft hole 110. Then the second first arc-shaped slider 662 that contacts the shaft hole 110 is moved, until the last first arc-shaped slider 662 that can contact the shaft hole 110 is moved.

[0064] There are two situations at this time. Fig. 9 As shown on the left side, the third arc-shaped slider 668 is within the range of the key slot 120 , and the third arc-shaped slider 668 will not move until all the first arc-shaped sliders 662 that can contact the inner wall of the shaft hole 110 are pushed to the inside of the shaft hole 110 .

[0065] If Fig. 9 As shown on the right side, the third arc-shaped slider 668 is in the non-key slot 120 range, wherein one or two first arc-shaped sliders 662 in the key slot 120 range are not pushed, so the third arc-shaped slider 668 will eventually be squeezed into the range of the key slot 120 by several second arc-shaped sliders 666 to complete the initial positioning.

[0066] It should be supplemented that, in order to facilitate the second arc-shaped slider 666 to push the third arc-shaped slider 668 to slide, both are provided with rounded edges. When a second arc-shaped slider 666 pushes the third arc-shaped slider 668 to slide clockwise or counterclockwise, the sliding distance of the third arc-shaped slider 668 due to inertia and friction and other factors can be controlled by setting the friction coefficient and other methods. This enables the third arc-shaped slider 668 to continue to slide clockwise or counterclockwise along the direction of the first sliding when the next second arc-shaped slider 666 pushes the third arc-shaped slider 668.

[0067] The curvature of the second curved slider 666 is set to be slightly smaller than half of the curvature of the key slot 120 in order to ensure that no matter where the initial position of the third curved slider 668 is in the circumferential range and the initial position of the key slot 120, at least one or two second curved sliders 666 fall within the range of the key slot 120. Instead of setting the curvature of the second curved slider 666 to be equal to the curvature of the key slot 120, the third curved slider 668 can only be inserted into the range of the key slot 120 when the key slot 120 coincides with the radial position of one of the second curved sliders 666.

[0068] Embodiment 5: This embodiment is an improvement made on the basis of Embodiment 4. For details, please refer to Figure 2-Figure 10 , the positioning assembly 660 further includes a fourth arc-shaped slider 669 disposed on the rotating seat 640 , and the fourth arc-shaped slider 669 is connected to the third arc-shaped slider 668 ;

[0069] The curvature of the fourth arc-shaped slider 669 is equal to the curvature of the key slot 120. When the hydraulic cylinder 620 drives the fourth arc-shaped slider 669 to rise and contact the bottom end of the impeller blank 100, the fourth arc-shaped slider 669 is pushed to fit with the key slot 120, and the fourth arc-shaped slider 669 then drives the two second support arms 510 to rotate to a position aligned with the key slot 120.

[0070] In this embodiment: after determining that the third arc-shaped slider 668 is within the range of the key slot 120, the connection seat 661 can be further raised until the two parallel sides of the key slot 120 touch the fourth arc-shaped slider 669. The two parallel sides of the fourth arc-shaped slider 669 are set with an inclination angle to facilitate being pushed. Since the fourth arc-shaped slider 669 and the key slot 120 have the same arc, the fourth arc-shaped slider 669 and the key slot 120 fit exactly.

[0071] One of the parallel sides of the key slot 120 will definitely contact one of the parallel sides of the fourth arc-shaped slider 669, and the fourth arc-shaped slider 669 will be pushed to fit with the key slot 120. The fourth arc-shaped slider 669, the third arc-shaped slider 668, and the rotating seat 640 are driven to complete the positioning of the key slot 120.

[0072] At this time, the second positioning mechanism 400 and the third positioning mechanism 500 are also driven by the rotating seat 640 as a whole so that the angle bisectors of the two first support arms 430 equipped with the second support arms 510 can coincide with the bisectors of the key slot 120. At this time, when the second three-jaw chuck 410 drives the three first support arms 430 to expand radially, the two second support arms 510 will fit with the key slot 120 and can resist the three sides of the key slot 120.

[0073] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A clamping device for the milling of a centrifugal blower impeller, used to fix an impeller blank, comprising a chassis, on which a first positioning mechanism, a second positioning mechanism, a third positioning mechanism and a driving mechanism are arranged; The first positioning mechanism includes a first three-jaw chuck arranged in the middle of the chassis, and three first clamping claws are slidably arranged on the first three-jaw chuck, and the three first clamping claws are synchronously moved radially toward the center direction of the first three-jaw chuck until the three first clamping claws abut against the edge of the impeller blank, thereby fixing the impeller blank; An axial hole is opened in the middle of the impeller blank, and the second positioning mechanism includes a second three-jaw chuck arranged in the chassis, and three second clamping claws are slidably arranged on the second three-jaw chuck, and the three second clamping claws are all provided with first support arms, and the three first support arms are driven by the three second clamping claws to synchronously move radially away from the center direction of the first three-jaw chuck until the three first support arms are against the inner wall of the axial hole, thereby fixing the impeller blank; A key slot is also provided on the impeller blank. The third positioning mechanism includes two second support arms, which are L-shaped. The two second support arms are respectively arranged on two of the first support arms. The three first support arms drive the two second support arms to press against the inner wall of the key slot to fix the impeller blank. A driving mechanism is also provided on the chassis, and the driving mechanism is used for driving the second positioning mechanism and the third positioning mechanism to rise and fall along the shaft hole. The driving mechanism includes a lifting seat slidably arranged in the chassis, a hydraulic cylinder is arranged in the chassis, a piston rod of the hydraulic cylinder is connected to the lifting seat, a circular rotating groove is provided on the lifting seat, a rotating seat is rotatably arranged in the circular rotating groove, the second three-jaw chuck is installed on the rotating seat, three first linear slide grooves are circumferentially provided on the rotating seat, and three first support arms are respectively slidably connected to the three first linear slide grooves.

2. The clamping device for milling a centrifugal blower impeller according to claim 1, characterized in that: A connecting block is arranged on one of the second supporting arms, and a connecting groove is arranged on the other second supporting arm, and the connecting block is slidably connected in the connecting groove.

3. The clamping device for milling a centrifugal blower impeller according to claim 1, characterized in that: The driving mechanism also includes a positioning assembly, which is used to position the keyway; The positioning assembly comprises a connecting seat arranged on the lifting seat, a plurality of first arc-shaped sliding blocks are arranged on the connecting seat, and the plurality of first arc-shaped sliding blocks are arranged equidistantly in the circumferential direction based on the center of the shaft hole.

4. The clamping device for milling a centrifugal blower impeller according to claim 3, characterized in that: The upper end of the first arc-shaped slider is an inclined surface inclined from the side close to the center of the shaft hole to the side away from the center of the shaft hole. The heights of several first arc-shaped sliders decrease in a clockwise direction, and the curvature of the first arc-shaped slider is less than half of the curvature of the keyway.

5. The clamping device for milling a centrifugal blower impeller according to claim 3, characterized in that: The positioning assembly also includes a plurality of second linear slide grooves circumferentially opened on the connecting seat, a plurality of first arc-shaped sliders are each provided with a slide rod, a plurality of slide rods are respectively slidably connected in the plurality of second linear slide grooves, and a plurality of slide rods are respectively elastically connected to the inner walls of the plurality of second linear slide grooves through a plurality of springs.

6. The clamping device for milling a centrifugal blower impeller according to claim 3, characterized in that: The positioning assembly also includes a plurality of second arc-shaped sliders respectively arranged on the plurality of first arc-shaped sliders, an annular slide groove is provided on the connecting seat, a third arc-shaped slider is slidably arranged in the annular slide groove, and the third arc-shaped slider is located on the inner side of the plurality of second arc-shaped sliders; In the process of the hydraulic cylinder driving several first arc-shaped sliders to rise and contact the bottom end of the impeller blank, several first arc-shaped sliders and several second arc-shaped sliders outside the lower side range of the keyway are pushed to the inside of the shaft hole, and then the third arc-shaped slider is pushed into the lower side range of the keyway to position the keyway.

7. The clamping device for milling a centrifugal blower impeller according to claim 6, characterized in that: The positioning assembly also includes a fourth arc-shaped sliding block arranged on the rotating seat, and the fourth arc-shaped sliding block is connected to the third arc-shaped sliding block.

8. The clamping device for milling a centrifugal blower impeller according to claim 7, characterized in that: The curvature of the fourth arc-shaped slider is equal to the curvature of the keyway. When the hydraulic cylinder drives the fourth arc-shaped slider to rise and contact the bottom end of the impeller blank, the fourth arc-shaped slider is pushed to fit with the keyway, and the fourth arc-shaped slider then drives the two second support arms to rotate to a position aligned with the keyway.

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