Gear machining clamp

Abstract

The utility model relates to a gear machining clamp which comprises a rack used for containing a gear. The pressing mechanism is used for pressing the upper end face of the gear downwards so that the gear can abut against and be limited to the rack. The first external expansion mechanism is used for moving in the radial direction of the gear to abut against the inner wall of the shaft hole of the gear so as to limit movement of the gear; and the second external expansion mechanism is arranged opposite to the first external expansion mechanism in the axial direction of the shaft hole, and the second external expansion mechanism is used for moving in the radial direction of the gear to abut against the inner wall of the shaft hole so as to limit movement of the gear. The gear is placed on the rack, the pressing mechanism enables the gear to abut against and be limited to the rack, the first external expansion mechanism can abut against the inner wall of the shaft hole, the second external expansion mechanism can move in the radial direction of the gear and abut against the inner wall of the shaft hole, movement of the gear is limited, and the fixing effect of the gear is guaranteed; and therefore, the gear is prevented from jumping and shifting in the machining process, and the gear can be ensured to have higher machining precision.

Description

Technical Field

[0001] The present disclosure relates to the technical field of fixtures, and in particular, to a gear processing fixture. Background Art

[0002] During the gear processing, the gear will jump and shift due to vibration. In order to ensure the processing accuracy of the gear, technicians need to use a fixture to restrict the gear on the processing surface of the machine frame to limit its movement. In the related art, the fixing effect of the gear is poor, resulting in easy jumping and shifting of the gear during the processing, and thus the processing accuracy of the gear is low. Summary of the Utility Model

[0003] The purpose of the present disclosure is to provide a gear processing fixture to at least partially solve the problems existing in the related art.

[0004] To achieve the above purpose, the present disclosure provides a gear processing fixture, including: a machine frame for placing the gear; a downward pressing mechanism for pressing the upper end surface of the gear to abut and restrict the gear on the machine frame; a first outward expansion mechanism for moving along the radial direction of the gear to abut against the inner wall of the shaft hole of the gear to restrict the movement of the gear; and a second outward expansion mechanism oppositely arranged with the first outward expansion mechanism in the axial direction of the shaft hole, the second outward expansion mechanism being configured to move along the radial direction of the gear to abut against the inner wall of the shaft hole to restrict the movement of the gear.

[0005] Optionally, the first outward expansion mechanism includes: an elastic expansion block for being arranged in the shaft hole; and a first power assembly connected to the elastic expansion block and configured such that when the first power assembly moves along the axial direction of the placed gear, the elastic expansion block can elastically move along the radial direction of the placed gear.

[0006] Optionally, the first power assembly includes: a top block, the elastic expansion block being sleeved on the outer periphery of the top block, and a first wedge surface being formed on the inner wall of the elastic expansion block, and a second wedge surface being formed on the outer wall of the top block and matching the first wedge surface; a driving motor fixedly connected to the machine frame; and a lead screw pair including a lead screw body and a nut, one end of the lead screw body extending into the elastic expansion block and the other end being connected to the driving motor, the nut being connected to the top block, the driving motor being configured to drive the lead screw body to rotate so that the second wedge surface approaches or moves away from the first wedge surface, thereby enabling the elastic expansion block to elastically move along the radial direction of the placed gear.

[0007] Optionally, the second outward expansion mechanism includes: a housing configured to extend downward into the shaft hole; an abutting block disposed within the housing and capable of extending or retracting radially of the gear after placement with respect to the housing; and a second power assembly connected to the abutting block for driving the abutting block to extend or retract with respect to the housing.

[0008] Optionally, the second power assembly includes: a power member connected to the housing for driving the housing to extend into the shaft hole; a slide bar extending radially of the gear after placement and slidably disposed within the housing and connected to the abutting block; and a telescopic rod extending axially of the gear after placement and partially extending into the housing to be in wedge fit with an end of the slide bar.

[0009] Optionally, a limiting sleeve is disposed within the housing, and the slide bar is slidably disposed through the limiting sleeve.

[0010] Optionally, the second power assembly further includes a spring sleeved on the outer periphery of the slide bar and elastically disposed between the abutting block and the limiting sleeve, and configured to be stretched when the abutting block expands outward and capable of driving the abutting block to retract through elastic reset.

[0011] Optionally, the pressing mechanism includes: a hydraulic rod mounted on the frame, an output shaft of the hydraulic rod being connected to the housing for driving the housing to extend into or out of the shaft hole; and a pressing block mounted on the housing for abutting against an upper end surface of the gear.

[0012] Optionally, the pressing block and the abutting block are of an integral structure.

[0013] Optionally, a rotatable workbench is mounted on the frame, the gear is placed on the workbench, and the pressing mechanism, the first outward expansion mechanism, and the second outward expansion mechanism are all configured to be rotatably mounted on the frame coaxially with the workbench.

[0014] Optionally, the gear processing fixture further includes a turntable, the turntable including a stationary ring and a rotating ring rotatably connected to the stationary ring, the stationary ring being connected to the frame, and the second outward expansion mechanism being connected to the rotating ring of the turntable.

[0015] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0016] Place the gear on the frame. The pressing mechanism can press down on the upper end face of the gear so that the gear can be abutted and restricted on the frame. The first outward expansion mechanism can move radially along the gear to abut against the inner wall of the shaft hole. The second outward expansion mechanism and the first outward expansion mechanism are oppositely arranged in the axial direction of the shaft hole. The second outward expansion mechanism can move radially along the gear and abut against the inner wall of the shaft hole, restricting the movement of the gear. By setting the pressing mechanism, the first outward expansion mechanism, and the second outward expansion mechanism, the fixing effect of the gear is ensured. Furthermore, it is ensured that the gear will not jump or shift during the machining process, thereby ensuring that the gear can have a high machining accuracy.

[0017] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. Brief Description of the Drawings

[0018] The drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0019] Figure 1 is a schematic diagram of a gear machining fixture shown according to an exemplary embodiment of the present disclosure.

[0020] Figure 2 is a partial cross-sectional view of a gear machining fixture shown according to an exemplary embodiment of the present disclosure.

[0021] Figure 3 is a cross-sectional view of the first outward expansion mechanism in a gear machining fixture shown according to an exemplary embodiment of the present disclosure.

[0022] Figure 4 is a half cross-sectional view of the second outward expansion mechanism in a gear machining fixture shown according to an exemplary embodiment of the present disclosure.

[0023] Description of the Reference Numerals in the Drawings

[0024] 100, frame; 110, workbench; 200, pressing mechanism; 210, hydraulic rod; 220, pressing block; 300, first outward expansion mechanism; 310, elastic expansion block; 311, first wedge surface; 320, first power assembly; 321, top block; 3211, second wedge surface; 322, lead screw body; 323, drive motor; 330, nut; 400, second outward expansion mechanism; 410, housing; 420, abutting block; 430, sliding rod; 440, telescopic rod; 441, inclined surface; 450, limiting sleeve; 460, spring; 470, sliding sleeve; 480, slider; 500, turntable. Specific Implementation Modes

[0025] The following will describe in detail the specific embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present disclosure, and are not intended to limit the present disclosure.

[0026] In the present disclosure, unless otherwise stated, the orientation terms such as "upper, lower" are defined for facilitating the description of the drawing direction according to the corresponding drawings. For example, the upper end face of the gear refers to the opposite face of the side of the gear in contact with the frame after the gear is placed on the frame. "Inner, outer" are defined according to the contour of the corresponding component itself. The terms such as "first, second" used in the present disclosure are used to distinguish one element from another, and do not have sequence and importance. In addition, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0027] Please refer to Figure 1 , a gear processing fixture provided by an embodiment of the present disclosure includes a frame 100, a downward pressing mechanism 200, a first outward expanding mechanism 300, and a second outward expanding mechanism 400. Among them, the frame 100 can be used to place a gear (not shown in the figure). The downward pressing mechanism 200 can be used to press down the upper end face of the gear so as to abut and limit the gear on the frame 100 to prevent the gear from axially moving during the processing. The first outward expanding mechanism 300 can be used to move radially along the gear so as to abut against the inner wall of the shaft hole of the gear to limit the radial movement of the gear. The second outward expanding mechanism 400 can be disposed opposite to the first outward expanding mechanism 300 in the axial direction of the shaft hole. The second outward expanding mechanism 400 can be used to move radially along the gear so as to abut against the inner wall of the shaft hole to limit the radial movement of the gear. It can be understood that the first outward expanding mechanism 300 and the second outward expanding mechanism 400 can respectively abut against the inner walls of the upper and lower parts of the shaft hole to further ensure that the gear does not jump and shift during the processing. Through the downward pressing mechanism 200 and the two outward expanding mechanisms, the gear can be limited at the same time, ensuring the fixing effect of the gear, so as to ensure that the gear can have a high processing accuracy. Moreover, since both the first outward expanding mechanism 300 and the second outward expanding mechanism 400 can move radially, different sizes of gears can be applied, and the applicable range is larger.

[0028] In this embodiment, the downward pressing mechanism 200, the first outward expanding mechanism 300, and the second outward expanding mechanism 400 can all be installed on the frame 100 to ensure the compactness of the installation space of the downward pressing mechanism 200 and the two outward expanding mechanisms. Of course, in other embodiments, the downward pressing mechanism 200, the first outward expanding mechanism 300, and the second outward expanding mechanism 400 can be respectively installed on other components, that is, the frame 100 can only be used to place the gear, and the installation positions of the downward pressing mechanism 200 and the two outward expanding mechanisms are not specifically limited here.

[0029] In the embodiments of the present disclosure, both the first expanding mechanism 300 and the second expanding mechanism 400 can be elastic expanding mechanisms. That is, the expanding mechanism will abut against the inner wall of the shaft hole under the action of elastic force. The implementation manners of the elastic force include, but are not limited to: the part in contact with the inner wall of the shaft hole is made of an elastic material, and the elastic force is provided by this part; it can also be that the part in contact with the inner wall of the shaft hole is made of a rigid material, and the rigid structure is driven by other structures made of elastic materials, and the elastic part driving the rigid structure provides the elastic force. Setting the expanding mechanism to be capable of providing an elastic force can absorb vibration during the gear processing, avoiding the gear from shifting under the action of vibration and resulting in poor machining quality of the gear.

[0030] In one embodiment, please refer to Figure 3 , the first expanding mechanism 300 may include an elastic expansion block 310 and a first power assembly 320. Among them, the elastic expansion block 310 can be used to be arranged in the shaft hole, and the elastic expansion block 310 can be made of rubber. The first power assembly 320 can be connected to the elastic expansion block 310 and can be configured such that when the first power assembly 320 moves axially along the placed gear, the elastic expansion block 310 can elastically move radially along the placed gear. The elastic expansion block 310 can elastically buffer the abutting force of the first expanding mechanism 300 against the inner wall of the shaft hole, avoiding damage to the inner wall of the shaft hole.

[0031] It can be understood that, in combination with Figure 3 , before gear processing, the gear is sleeved on the outer periphery of the elastic expansion block 310, and the first power assembly 320 moves axially along the placed gear, so that the elastic expansion block 310 can elastically expand to abut against the inner wall of the shaft hole, avoiding the gear from jumping and shifting during the processing; after the gear processing is completed, the first power assembly 320 can move in the reverse direction, so that the elastic expansion block 310 can elastically reset to be separated from the inner wall of the shaft hole.

[0032] In one embodiment, please refer to Figure 2 and 3The first power assembly 320 may include a top block 321, a drive motor 323 and a lead screw pair. The elastic expansion block 310 may be sleeved on the outer periphery of the top block 321, and the inner wall of the elastic expansion block 310 may be formed with a first wedge surface 311, and the outer wall of the top block 321 may be formed with a second wedge surface 3211 matching the first wedge surface 311. The drive motor 323 may be fixedly connected to the frame 100. The screw pair may include a screw body 322 and a nut 330. One end of the screw body 322 may extend into the elastic expansion block 310, and the other end may be connected to the drive motor 323. The nut 330 may be connected to the top block 321. The drive motor 323 may be used to drive the screw body 322 to rotate, so that the second wedge surface 3211 approaches or moves away from the first wedge surface 311, so that the elastic expansion block 310 may move elastically along the radial direction of the placed gear. The screw pair may convert the rotational motion of the drive shaft of the drive motor 323 into the up and down motion of the top block 321, so that the elastic expansion block 310 may expand outward and reset. This structure is relatively simple and convenient.

[0033] It is understandable that, combined with Figure 2 and 3 The nut 330 can drive the top block 321 to move downward, so that the second wedge surface 3211 is close to the first wedge surface 311. At this time, the side wall of the elastic expansion block 310 will elastically expand outward until it abuts against the inner wall of the shaft hole. Furthermore, the outer wall of the elastic expansion block 310 is constructed as an arc shape that matches the inner wall of the shaft hole to be contacted, thereby increasing the contact area between the two, ensuring that the force on the inner wall of the shaft hole is uniform, and avoiding the inner wall of the shaft hole from being squeezed and damaged. After the gear is processed, the drive motor 323 drives the screw body 322 to rotate in the opposite direction, so that the nut 330 can drive the top block 321 to move downward, so that the second wedge surface 3211 is away from the first wedge surface 311. At this time, the side wall of the elastic expansion block 310 will elastically reset, that is, it will no longer abut against the inner wall of the shaft hole.

[0034] In another embodiment, the first power assembly 320 may include a top block 321, a motor and a screw. The motor and the screw are connected in a transmission manner, the screw can extend into the elastic expansion block 310, and are respectively screwed with the bottom of the elastic expansion block 310 and the top block 321. Because the elastic expansion block 310 is relatively large in mass, it is not easy for the screw to drive the elastic expansion block 310 to rotate. When it is necessary to limit the inner wall of the shaft hole of the gear, the motor will drive the screw to rotate, and the screw can move upward relative to the elastic expansion block 310, so that the top block 321 can move upward, so that the second wedge surface 3211 is close to the first wedge surface 311, so that the elastic expansion block 310 expands outward; the motor rotates in the opposite direction, so that the top block 321 can move downward, so that the second wedge surface 3211 is away from the first wedge surface 311, so that the elastic expansion block 310 can be elastically reset.

[0035] In one embodiment, see Figure 2 and 4 The second outward expansion mechanism 400 may include a shell 410, an abutment block 420 and a second power assembly. The shell 410 may be used to extend downward into the shaft hole. The abutment block 420 may be disposed in the shell 410, and may extend out or extend into the shell 410 along the radial direction of the placed gear. The second power assembly may be connected to the abutment block 420, so as to be used to drive the abutment block 420 to extend out or extend into the shell 410. By setting the first outward expansion mechanism 300 and the second outward expansion mechanism 400, the upper and lower parts of the inner wall of the shaft hole may be limited to ensure the limiting effect of the gear.

[0036] It is understandable that, when the gear is placed on the rack 100, the housing 410 can move downward into the shaft hole, and the second power assembly can drive the abutment block 420 to extend out of the housing 410, so that the abutment block 420 can abut against the inner wall of the shaft hole; after the gear is processed, the first power assembly 320 drives the abutment block 420 to move in the opposite direction to extend into the housing 410, so that the abutment block 420 releases the abutment against the inner wall of the shaft hole, and the housing 410 can move upward to the initial state. By controlling the rise or fall of the housing 410, the housing 410 is prevented from interfering with the placement and removal of the gear on the rack 100.

[0037] For further information, see Figure 4 There are multiple abutment blocks 420, which are arranged at circumferential intervals in the shell 410. The second power component can be connected to the multiple abutment blocks 420 at the same time to drive the multiple abutment blocks 420 to extend out of the shell 410 at the same time, so that the abutment blocks 420 can abut against the inner wall of the shaft hole, thereby improving the abutment effect of the second outward expansion mechanism 400 on the inner wall of the shaft hole.

[0038] In this implementation, see Figure 4 , the second power assembly may include a power piece, a slide bar 430 and a telescopic rod 440. Among them, the power piece may be connected to the housing 410 so as to be used to drive the housing 410 to extend into the shaft hole. The slide bar 430 may extend along the radial direction of the placed gear, and may be slidably arranged in the housing 410, and may be connected to the abutment block 420. The telescopic rod 440 may extend along the axial direction of the placed gear, and may partially extend into the housing 410 so as to be wedge-matched with the end of the slide bar 430, so as to facilitate the telescopic rod 440 to convert the up and down movement into the horizontal movement of the abutment block 420, so as to facilitate the technician to take out the processed gear. Further, a slider 480 may be installed at one end of the telescopic rod 440 close to the slide bar 430, and the telescopic rod 440 may drive the slider 480 to move up and down, so that the slider 480 may abut or release the restriction on the slide bar 430, and the wear of the end of the telescopic rod 440 close to the slide bar 430 may be avoided by setting the slider 480.

[0039] It is understandable that the gear is placed on the frame 100, and the power component can drive the housing 410 to extend downward into the shaft hole. The power component can be an oil cylinder, a cylinder or a hydraulic cylinder, and no specific limitation is made here. One end of the telescopic rod 440 can extend out to push against the wedge-shaped end of the sliding rod 430, so that the sliding rod 430 can push the abutting block 420 to extend out of the housing 410 until it abuts against the inner wall of the shaft hole; the telescopic rod 440 can move in the reverse direction to release the abutment against the sliding rod 430, so that the abutting block 420 can extend into the housing 410 to release the restriction on the inner wall of the gear, facilitating the technician to take out the processed gear.

[0040] In this embodiment, please refer to Figure 4 , a limiting sleeve 450 can be arranged in the housing 410, and the sliding rod 430 is slidably arranged through the limiting sleeve 450. The limiting sleeve 450 is used to guide the sliding rod 430 to move in a straight line, ensuring that the sliding rod 430 can drive the abutting block 420 to move in a straight line, thereby ensuring the abutting effect of the abutting block 420 on the inner wall of the shaft hole.

[0041] In one embodiment, please refer to Figure 4 , the second power assembly can further include a spring 460. The spring 460 can be sleeved on the outer periphery of the sliding rod 430, saving the installation space of the spring 460, and the spring 460 can be elastically arranged between the abutting block 420 and the limiting sleeve 450, and can be configured to be stretched when the abutting block 420 expands outward, and can drive the abutting block 420 to quickly retract through elastic reset, without the user manually resetting the abutting block 420.

[0042] In another embodiment, the bottom wall of the housing 410 is configured as an inclined surface 441 that is low in the middle and high around. When the telescopic rod 440 releases the restriction on the sliding rod 430, the sliding rod 430 can drive the abutting block 420 to slide from the high place to the low place of the inclined surface 441, so that the abutting block 420 can extend into the housing 410.

[0043] In one embodiment, please refer to Figure 1 and 2 , the pressing mechanism 200 can include a hydraulic rod 210 and a pressing block 220. Among them, the hydraulic rod 210 can be installed on the frame 100, and the output shaft of the hydraulic rod 210 can be connected to the housing 410 to be used to drive the housing 410 to extend into or out of the shaft hole. The hydraulic rod 210 can have a certain shock absorption effect, reducing the vibration of the gear and improving the machining accuracy of the gear. The pressing block 220 can be installed on the housing 410 to be used to abut against the upper end surface of the gear, restricting the vibration and offset of the gear during cutting, and improving the stability and accuracy of gear processing.

[0044] It should be noted that the hydraulic rod 210 and the power component can exist simultaneously. When the pressing mechanism 200 operates, one ends of the hydraulic rod 210 and the power component can extend simultaneously to increase the abutting force of the pressing block 220 against the upper end surface of the gear. Of course, either the hydraulic rod 210 or the power component can be selected. That is, the second expanding mechanism 400 moves up and down in the axial direction of the gear by relying on the hydraulic cylinder of the pressing mechanism 200, or the pressing block 220 of the pressing mechanism 200 can move up and down by relying on the power component of the second expanding mechanism 400. This can save a driving component for up and down movement and reduce the manufacturing cost of the gear processing fixture.

[0045] In this embodiment, please refer to Figure 2 and 4 , the pressing block 220 and the abutting block 420 can be of an integral structure, which is convenient for the processing and manufacturing of both. This integral structure can be constructed as an L shape. In the L shape, the bottom of the pressing block 220 can be used to abut against the upper end surface of the gear, and one side of the abutting block 420 in the L shape connected to the bottom of the pressing block 220 is used to abut against the inner wall of the shaft hole of the gear.

[0046] In this embodiment, please refer to Figure 2 , a rotatable workbench 110 can be installed on the frame 100. For example, the workbench 110 can be a rotary workbench or a revolving workbench. The gear can be placed on the workbench 110. The pressing mechanism 200, the first expanding mechanism 300, and the second expanding mechanism 400 can all be configured to be coaxially rotatably installed on the frame 100 with the workbench 110, which is convenient for the pressing mechanism 200 and the two expanding mechanisms to still stably abut against the gear during the rotation of the gear and ensure the machining accuracy of the gear.

[0047] In one embodiment, please refer to Figure 2 , the gear processing fixture can further include a turntable 500. The turntable 500 can include a stationary ring and a rotating ring rotatably connected to the stationary ring. The stationary ring can be connected to the frame 100, and the second expanding mechanism 400 can be connected to the rotating ring of the turntable 500 to ensure that the inner wall of the shaft hole of the gear can drive the second expanding mechanism 400 to rotate synchronously by relying on friction, thus ensuring the machining accuracy of the gear. For example, the housing 410 and the telescopic rod 440 in the second expanding mechanism 400 can be directly connected to the rotating ring. The gear drives the abutting block 420 to rotate by relying on friction, so that the sliding rod 430 connected to the abutting block 420 can drive the limiting sleeve 450 and the telescopic rod 440 to rotate, and then the housing 410 connected to the sliding sleeve 470 can rotate, ensuring that the second expanding mechanism 400 can rotate synchronously with the gear.

[0048] In one embodiment, a part of the structure in the pressing mechanism 200 (such as the pressing block 220) can rotate coaxially with the rotating ring, enabling the gear to drive its synchronous rotation by relying on friction. For example, when the pressing mechanism 200 and the second outward expansion mechanism 400 share a driving component (such as the power component or the hydraulic rod 210 described above) that can drive the housing 410 to move up and down, the driving component can be connected to the stationary ring, and the stationary ring is connected to the frame 100 through the driving component. During the rotation of the gear, it can drive the pressing block 220 and the abutting block 420 to rotate following it by relying on friction. Since the driving component is connected to the stationary ring, it is avoided that the driving component is damaged due to the torsional force during the rotation of the gear. Of course, all the structures of the pressing mechanism 200 (the hydraulic rod 210 and the pressing block 220) can be connected to the rotating ring, enabling the gear to drive each component of the pressing mechanism 200 to rotate coaxially by friction.

[0049] In one embodiment, the first outward expansion mechanism 300 can also be integrally connected to the rotating ring to ensure the limiting effect of the first outward expansion mechanism 300 on the gear.

[0050] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0051] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0052] In addition, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A gear processing fixture, characterized in that: include: A rack for placing gears; A pressing mechanism, used for pressing down the upper end surface of the gear to restrict the gear from abutting against the frame; A first outward expansion mechanism, used to move in the radial direction of the gear to abut against the inner wall of the shaft hole of the gear to limit the movement of the gear; as well as The second outward expansion mechanism is arranged opposite to the first outward expansion mechanism in the axial direction of the shaft hole, and the second outward expansion mechanism is used to move along the radial direction of the gear to abut against the inner wall of the shaft hole to limit the movement of the gear.

2. The gear processing fixture according to claim 1, characterized in that: The first outward expansion mechanism comprises: An elastic expansion block, used to be arranged in the shaft hole; and The first power assembly is connected to the elastic expansion block and is configured so that when the first power assembly moves along the axial direction of the placed gear, the elastic expansion block can elastically move along the radial direction of the placed gear.

3. The gear processing fixture according to claim 2, characterized in that: The first power assembly comprises: A top block, wherein the elastic expansion block is sleeved on the outer periphery of the top block, and the inner wall of the elastic expansion block is formed with a first wedge-shaped surface, and the outer wall of the top block is formed with a second wedge-shaped surface matching the first wedge-shaped surface; A driving motor, fixedly connected to the frame; and The screw pair includes a screw body and a nut. One end of the screw body extends into the elastic expansion block, and the other end is connected to the driving motor. The nut is connected to the top block. The driving motor is used to drive the screw body to rotate so that the second wedge surface approaches or moves away from the first wedge surface, thereby causing the elastic expansion block to move elastically along the radial direction of the gear after placement.

4. The gear processing fixture according to claim 1, characterized in that: The second outward expansion mechanism comprises: A housing, used to extend downward into the shaft hole; an abutment block, disposed in the housing and capable of extending out of or into the housing in a radial direction of the gear after placement; and The second power assembly is connected to the abutment block to drive the abutment block to extend out of or into the housing.

5. The gear processing fixture according to claim 4, characterized in that: The second power assembly comprises: A power member connected to the housing to drive the housing to extend into the shaft hole; a sliding rod extending in the radial direction of the placed gear, slidably disposed in the housing, and connected to the abutment block; and The telescopic rod extends along the axial direction of the placed gear and partially extends into the housing to be wedge-matched with the end of the sliding rod.

6. The gear processing fixture according to claim 5, characterized in that: A limiting sleeve is arranged in the shell, and the slide bar is slidably arranged in the limiting sleeve.

7. The gear processing fixture according to claim 6, characterized in that: The second power assembly also includes a spring, which is sleeved on the outer circumference of the slide rod and elastically arranged between the abutment block and the limiting sleeve, and is configured to be stretched when the abutment block expands outward, and can drive the abutment block to retract through elastic resetting.

8. The gear processing fixture according to claim 4, characterized in that: The pressing mechanism comprises: A hydraulic rod is mounted on the frame, and an output shaft of the hydraulic rod is connected to the housing to drive the housing to extend into or out of the shaft hole; and A lower pressing block is installed on the housing to abut against the upper end surface of the gear.

9. The gear processing fixture according to claim 8, characterized in that: The pressing block and the abutting block are an integrated structure.

10. The gear processing fixture according to claim 1, characterized in that: A rotatable workbench is installed on the frame, the gear is placed on the workbench, and the pressing mechanism, the first outward expansion mechanism and the second outward expansion mechanism are all configured to be coaxially rotatably installed on the frame with the workbench.

11. The gear processing fixture according to claim 10, characterized in that: The gear processing fixture also includes a turntable, which includes a stationary ring and a rotating ring rotatably connected to the stationary ring, the stationary ring is connected to the frame, and the second outward expansion mechanism is connected to the rotating ring of the turntable.

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