Positioning clamp for hub machining

Abstract

The invention relates to the technical field of hub accessory machining, in particular to a hub machining positioning fixture which comprises a chuck body and three clamping jaws slidably arranged on the chuck body, a clamping groove is formed in the middle of the chuck body, a blocking assembly is arranged in the middle of the clamping groove, and the blocking assembly comprises a bottom pipe and a blocking block. The bottom pipe is vertically and fixedly connected to the middle of the chuck body, the stop block is vertically and fixedly connected to the upper end of the bottom pipe, the upper surface of the stop block is in an umbrella shape, three clamping openings are annularly formed in the side edge of the stop block, and the three clamping openings correspond to the three clamping jaws. A mounting space is formed in the stop block; and an air injection assembly is arranged above the stop block. The formed fixed space can be self-adaptively adjusted according to the diameter of a hub, gaps are avoided, and rapid cleaning of chippings is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of wheel hub component processing technology, and in particular to a positioning fixture for wheel hub processing. Background Technology

[0002] The wheel hub of a skateboard is connected to the skateboard bridge through bearings and is the core of load-bearing and transmission. The wheel hub is precision machined by CNC machine tools through milling, drilling, tapping and other processes. However, before processing, the wheel hub needs to be accurately and stably fixed on the machine tool. Usually, a three-jaw chuck is used to apply clamping force to overcome the cutting force and keep the workpiece in contact with the positioning point during the processing.

[0003] Patent CN107900388B discloses a flexible machining fixture for automotive wheel hubs, capable of automatically positioning and clamping wheel hubs of different sizes to meet the needs of automated production. Its triangular platform is located above a triangular pull plate. T-slots are formed at the three ends of both the platform and the pull plate, with guide rails on opposite sides of the T-slots. A U-shaped pad is provided above the T-slots on the platform, and a positioning claw is positioned above the U-shaped pad. A pull arm passes through the T-slots, with its top side connected to the positioning claw. This fixture allows the movement direction of the drive frame and the pull plate to be opposite to the movement direction during positioning and clamping, achieving automatic release of the wheel hub. No manual adjustment is required throughout the clamping and releasing process, greatly improving work efficiency.

[0004] However, during the wheel hub positioning process, a large amount of debris falls into the moving space between multiple positioning claws and the gaps where the claws slide. This not only makes it inconvenient to clean up the debris quickly, but also easily obstructs the movement of the claws, affecting their normal movement. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of inconvenient debris cleaning and easy obstruction of chuck movement in the prior art, thus proposing a positioning fixture for wheel hub processing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A positioning fixture for wheel hub processing includes: a chuck body and three jaws slidably disposed on the chuck body. The chuck body has a clamping groove in the middle and a blocking component in the middle of the clamping groove. The blocking component includes a bottom tube and a blocking block. The bottom tube is vertically fixedly connected to the middle of the chuck body, and the blocking block is vertically fixedly connected to the upper end of the bottom tube. The upper surface of the blocking block is umbrella-shaped, and three slots are circumferentially opened on the side of the blocking block, with the three slots corresponding to the three jaws. The blocking block has an installation space inside, which is connected to the three jaws via a sliding groove. The installation space has a telescopic component inside, which is used to elastically contact the three jaws. An air jet assembly is provided above the blocking block, and the air jet assembly is used to clean the surface of the blocking block. The chuck body has three outgoing ports arranged in a ring, and the outgoing ports are located between two adjacent jaws.

[0007] Preferably, the telescopic component includes a fixed block, three spring tubes, and three contact blocks. The fixed block is disposed inside the installation space, the three spring tubes are respectively fixedly connected to the side of the fixed block, and the three contact blocks are respectively fixedly connected to the end of the three spring tubes away from the fixed block and are slidably disposed inside the slide groove.

[0008] Preferably, the chute is inclined on a horizontal plane and is an arc-shaped groove, with both its upper and lower surfaces parallel to the upper surface of the blocking block. The contact block is an arc-shaped block and is slidably disposed inside the chute.

[0009] Preferably, a guide block is fixedly connected to the upper side of the end of the contact block away from the spring tube. The guide block is fan-shaped and its straight side is inclined to guide material to both sides. Both the contact block and the guide block are made of elastic material.

[0010] Preferably, the jet assembly includes three compression airbags and three nozzles. The three compression airbags are fixedly connected in a ring to the side of the bottom tube, with the compression airbags near the bayonet position. The three nozzles are fixedly connected in a ring to the upper surface of the blocking block and are respectively facing the three outlet positions. An air guide channel is provided between the bottom tube and the fixing block. The three compression airbags are connected to the air guide channel, and the air guide channel is connected to the three nozzles.

[0011] Preferably, a locking component is provided between the bottom tube and the chuck body, the locking component being used to fix the position of the bottom tube.

[0012] Preferably, the clamping assembly includes three clamping plates and three clamping seats. The three clamping seats are fixedly connected in a ring to the inner wall of the clamping groove, and the three clamping plates are fixedly connected in a ring to the bottom tube and are respectively disposed between the two compression airbags. The three clamping plates are respectively clamped in the three clamping seats.

[0013] Preferably, the upper surface of the blocking block is higher than the bottom surface of the outlet, the outlet is fan-shaped, and the side of the outlet away from the blocking block is inclined downward.

[0014] Preferably, the blocking block has three jet nozzles arranged in a ring on its side. The air inlet of each jet nozzle is connected to the air guide channel, and the air outlet is close to the outlet, for use in guiding air into the outlet.

[0015] Preferably, two push plates are symmetrically fixedly connected to both sides of the end of the contact block away from the spring tube. Half of the push plate is fixed to the contact block, and the other half is inclinedly arranged on the outside of the contact block. The push plate is made of elastic material and is used to block and push debris.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The umbrella-shaped blocking block can guide the generated debris to the outlet position, thereby preventing debris from accumulating between the blocking block and the chuck. Multiple telescopic components can extend and retract with the movement of the chuck, ensuring that there are no gaps between the chuck and the telescopic components during the fixing process of wheel hubs of different diameters, thus ensuring the blocking and cleaning of generated debris. The fixing space formed by this invention can be adaptively adjusted according to the diameter of the wheel hub, avoiding the generation of gaps and ensuring rapid cleaning of debris. 2. Due to the elasticity of the contact block and the guide block, as well as the inclined edge of the guide block, the debris falling on them will bounce to both sides and be transferred to the surface of the blocking block. Since the blocking block is made of metal and has low elasticity, it cannot make the debris bounce again. At the same time, due to the two contact blocks that protrude relative to the surface of the blocking block, the two adjacent contact blocks and the blocking block located between the two contact blocks form a barrier, effectively controlling the falling debris within the limiting space. 3. During the process of pressing and squeezing the airbag, the gas inside the airbag is ejected from the three nozzles through the air guide channel. Since the nozzles are facing the guide outlet, the air jet direction is also towards the guide outlet, thereby ejecting the powder adhering to the surface of the blocking block to the guide outlet, reducing powder residue, ensuring the falling and transfer of debris, and extending the cleaning cycle of the blocking block surface. 4. In order to facilitate the rapid discharge of generated debris, the bottom of the discharge port should be lower than the height of the top of the blocking block, so that there is a vertical drop between the blocking block and the discharge port. At the same time, the tilt angle of the discharge port is greater than the discharge angle of the surface of the blocking block, which speeds up the discharge of debris. Meanwhile, the discharge port gradually increases in size towards the discharge point, which avoids the accumulation and blockage of debris. 5. If debris is blocked at the outlet, during processing, as the contact block moves, the pushing plate will gradually come into contact with the side of the outlet, thereby pushing the debris accumulated at the outlet and allowing the blocked debris to enter the outlet. Attached Figure Description

[0017] Figure 1 This is a front structural diagram of a positioning fixture for wheel hub processing proposed in this invention; Figure 2 This is a schematic diagram of the bottom structure of a positioning fixture for wheel hub processing proposed in this invention; Figure 3 This is a schematic diagram of the jet assembly structure of a positioning fixture for wheel hub processing proposed in this invention; Figure 4 This is a cross-sectional view of the jet assembly of a positioning fixture for wheel hub processing proposed in this invention; Figure 5 This is a schematic diagram of the clamping assembly structure of a positioning fixture for wheel hub processing proposed in this invention; Figure 6 This is a schematic diagram of the air jet structure of a positioning fixture for wheel hub processing proposed in this invention; Figure 7 This is a schematic diagram of the push plate structure of a positioning fixture for wheel hub processing proposed in this invention; Figure 8 This is a schematic diagram of the telescopic change of a positioning fixture for wheel hub processing proposed in this invention.

[0018] In the diagram: 1. Chuck body; 2. Chuck claw; 3. Blocking assembly; 31. Bottom tube; 32. Blocking block; 4. Telescopic component; 41. Fixing block; 42. Spring tube; 43. Contact block; 5. Air jet assembly; 51. Compression airbag; 52. Nozzle; 6. Outlet; 7. Guide block; 8. Locking assembly; 81. Locking plate; 82. Locking seat; 9. Air jet nozzle; 10. Push plate; 11. Locking slot; 12. Slide groove; 13. Limiting space; 14. Installation space. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0021] Reference Figures 1-8 A positioning fixture for wheel hub processing includes: a chuck body 1 and three jaws 2 slidably disposed on the chuck body 1. The chuck body 1 has a clamping groove in the middle and a blocking component 3 in the middle of the clamping groove. The blocking component 3 includes a bottom tube 31 and a blocking block 32. The bottom tube 31 is vertically fixedly connected to the middle of the chuck body 1, and the blocking block 32 is vertically fixedly connected to the upper end of the bottom tube 31. The upper surface of the blocking block 32 is umbrella-shaped, and three slots 11 are circumferentially opened on the side of the blocking block 32. The three slots 11 correspond to the three jaws 2. The blocking block 32 has an installation space inside, which is connected to the three jaws 11 through a sliding groove 12. The installation space has a telescopic component 4 inside, which is used to elastically contact the three jaws 2. An air jet assembly 5 is provided above the blocking block 32, and the air jet assembly 5 is used to clean the surface of the blocking block 32. The chuck body 1 has three outlet ports 6 arranged in a ring, and the outlet ports 6 are located between two adjacent jaws 2.

[0022] In the embodiment of the above technical solution, by setting the blocking block 32, it is possible to prevent the debris from falling into the installation space during the processing and affecting the normal movement of the chuck 2. At the same time, the umbrella-shaped blocking block 32 can guide the generated debris to the outlet 6, thereby preventing the debris from accumulating between the blocking block 32 and the chuck 2. Multiple telescopic components 4 can extend and retract as the claw 2 moves, thereby forming a movable limiting space 13 with the claw 2, the telescopic components 4, and the blocking block 32. This ensures that there is no gap between the claw 2 and the telescopic components 4 during the fixing of wheel hubs of different diameters, and ensures the blocking and cleaning of generated debris.

[0023] The fixed space created by this invention can be adaptively adjusted according to the diameter of the wheel hub, avoiding the formation of gaps and ensuring rapid cleaning of debris.

[0024] The preferred technical solution in this embodiment is: Reference Figure 3-4 The telescopic component 4 includes a fixed block 41, three spring tubes 42 and three contact blocks 43. The fixed block 41 is disposed inside the installation space. The three spring tubes 42 are respectively fixedly connected to the side of the fixed block 41. The three contact blocks 43 are respectively fixedly connected to the end of the three spring tubes 42 away from the fixed block 41 and are slidably disposed inside the slide groove 12. The slide groove 12 is inclined on the horizontal plane and is an arc-shaped groove. Both the upper and lower surfaces are parallel to the upper surface of the blocking block 32. The contact block 43 is an arc-shaped block and is slidably disposed inside the slide groove 12.

[0025] In order to accommodate the fixing of wheel hubs of different diameters, it is necessary to control the sliding of the chuck 2 inside the chuck body 1, change the spacing between multiple chucks 2, and thus complete the internal support clamping of the wheel hub.

[0026] To ensure that the debris generated during the wheel hub manufacturing process falls intact onto the blocking assembly 3, three corresponding jaws 11 are provided on the blocking block 32. A telescopic component 4, capable of expansion and contraction, is installed inside the jaws 11 to prevent gaps from forming between the blocking block 32 and the jaws 2, thus avoiding debris getting stuck in the gaps. The contact block 43 maintains close contact with the center of the jaws 2 and moves with the jaws 2. The contact block 43 is compressed and reset by a spring tube 42 connected inside it, ensuring that the contact block 43 always contacts the side of the jaws 2. This prevents gaps from forming between the jaws 2 and the blocking block 32 during jaw movement, ensuring the blocking block 32 effectively collects and blocks the debris.

[0027] Reference Figure 3-5 A guide block 7 is fixedly connected to the upper side of the contact block 43 away from the spring tube 42. The guide block 7 is fan-shaped and the straight side of the guide block 7 is inclined to guide the material to both sides. Both the contact block 43 and the guide block 7 are made of elastic material.

[0028] By setting the guide block 7, the horizontal height of the contact block 43 is higher than the height of the blocking blocks 32 on both sides during the wheel hub clamping process. Since both the contact block 43 and the guide block 7 are made of elastic material (such as rubber or high elastic resin), when debris falls onto the contact block 43 and the guide block 7, due to the elasticity and the setting of the inclined edge of the guide block 7, the debris falling onto the contact block 43 and the guide block 7 will bounce to both sides and transfer to the surface of the blocking block 32. Since the blocking block 32 is made of metal material with low elasticity, it cannot make the debris bounce again. At the same time, due to the two contact blocks 43 protruding relative to the surface of the blocking block 32, the two adjacent contact blocks 43 and the blocking block 32 located between the two contact blocks 43 form a barrier, effectively controlling the falling debris inside the limiting space 13, so that the generated debris can be quickly discharged through the three outlets 6, avoiding the accumulation of debris on the blocking component 3.

[0029] Reference Figure 3-4 The jet assembly 5 includes three compression airbags 51 and three nozzles 52. The three compression airbags 51 are fixedly connected in a ring to the side of the bottom tube 31, and the compression airbags 51 are close to the bayonet 11. The three nozzles 52 are fixedly connected in a ring to the upper surface of the blocking block 32 and are respectively facing the three outlets 6. An air guide channel is provided between the bottom tube 31 and the fixing block 41. The three compression airbags 51 are connected to the air guide channel, and the air guide channel is connected to the three nozzles 52.

[0030] During the processing of the wheel hub, debris and powder are generated. Due to their own weight, the debris will slide down the inclined surface of the blocking block 32. However, the generated powder is too light to move with the inclined surface, causing the powder to accumulate on the surface of the blocking block 32. This not only affects the transfer of debris, but also requires separate cleaning later.

[0031] After the wheel hub is processed, the multiple claws 2 inside the wheel hub move inward, thereby loosening the fixation of the wheel hub. When the claws 2 move inward, they simultaneously squeeze the contact block 43 and the compression airbag 51. During the process of squeezing the compression airbag 51, the gas inside the airbag is ejected from the three nozzles 52 through the air guide channel. Since the nozzles 52 are positioned towards the guide outlet 6, the generated air jet is also directed towards the guide outlet 6, thereby spraying the powder adhering to the surface of the blocking block 32 towards the guide outlet 6, reducing powder residue, ensuring the falling and transfer of debris, and extending the cleaning cycle of the surface of the blocking block 32.

[0032] Reference Figure 5 A locking component 8 is provided between the bottom tube 31 and the chuck body 1, and the locking component 8 is used to fix the position of the bottom tube 31. The clamping assembly 8 includes three clamping plates 81 and three clamping seats 82. The three clamping seats 82 are fixedly connected in a ring to the inner wall of the clamping groove. The three clamping plates 81 are fixedly connected in a ring to the bottom tube 31 and are respectively disposed between the two compression airbags 51. The three clamping plates 81 are respectively clamped in the three clamping seats 82.

[0033] To ensure the correspondence between the blocking component 3 and the claw 2, and to facilitate the quick installation and removal of the blocking component 3, during installation, the three card plates 81 are slidably engaged with the three card seats 82 to ensure the installation of the blocking component 3.

[0034] Two adjacent clamping plates 81 can limit the compression airbag 51, ensuring that the compression airbag 51 will not expand to both sides when squeezed by the clamping claw 2, and ensuring that the compression airbag 51 can discharge the internal gas to the maximum extent, thereby generating a sufficient airflow impact effect.

[0035] Reference Figure 2 and Figure 6 The upper surface of the blocking block 32 is higher than the bottom surface of the outlet 6. The outlet 6 is fan-shaped and is inclined downward on the side of the outlet 6 away from the blocking block 32. The blocking block 32 has three jet nozzles 9 arranged in a ring on its side. The air inlet of the jet nozzle 9 is connected to the air guide channel, and the air outlet is close to the outlet 6, which is used to guide the air into the outlet 6.

[0036] To facilitate the rapid removal of generated debris, the bottom surface of the outlet 6 is lower than the upper surface of the blocking block 32, creating a vertical drop between the blocking block 32 and the outlet 6. At the same time, the tilt angle of the outlet 6 is greater than the tilt angle of the surface of the blocking block 32, accelerating the removal speed of debris. Meanwhile, the area inside the outlet 6 gradually increases towards the outlet, preventing debris from accumulating and clogging.

[0037] After processing is completed, some powder may adhere to the inner wall of the outlet 6. The accumulation of powder caused by adhesion may affect the falling of debris. When the chuck 2 is released, it will squeeze the compression airbag 51. Some of the gas inside the compression airbag 51 will be squeezed into the jet nozzle 9. Since the outlet end of the jet nozzle 9 gradually becomes smaller, the impact force generated by the jet is ensured to impact and discharge the powder inside the outlet 6.

[0038] During the retraction process, the chuck 2 squeezes multiple internal compression airbags 51, and simultaneously sprays air through the upper nozzle 52 and the lower air outlet 9 to clean the surface of the blocking block 32 and the interior of the outlet 6, thereby ensuring the cleaning and discharge of the processing powder.

[0039] Reference Figure 7 Two push plates 10 are symmetrically fixed to both sides of the end of the contact block 43 away from the spring tube. Half of the push plate 10 is fixed to the contact block 43, and the other half is inclined to be arranged on the outside of the contact block 43. The push plate 10 is made of elastic material and is used to block and push debris.

[0040] By setting two push plates 10 on both sides of the contact block 43, during processing and clamping, the push plates 10 contact the side of the outlet 6, thereby making the push plates 10 arc-shaped, which provides arc-shaped blocking at the small angle corner between the outlet 6 and the blocking block 32, thus preventing debris from accumulating and getting stuck inside the corner. Even if some debris accumulates inside the arc-shaped corner formed by the push plates 10, when processing is completed, the contact block 43 slides inward, and the push plates 10 separate from the chuck body 1, thereby changing the push plates 10 from an arc-shaped state to a straight state. The accumulated debris will also fall onto the blocking block 32, thus exporting the debris. Meanwhile, if debris blocks the outlet 6, during processing, the pusher 10 will gradually contact the side of the outlet 6 as the contact block 43 moves, thereby pushing the debris accumulated at the outlet 6 and allowing the blocked debris to enter the outlet 6.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A positioning fixture for wheel hub machining, comprising: The chuck body and three jaws slidably disposed on the chuck body are characterized in that a clamping groove is provided in the middle of the chuck body, a blocking component is provided in the middle of the clamping groove, the blocking component includes a bottom tube and a blocking block, the bottom tube is vertically fixedly connected to the middle of the chuck body, the blocking block is vertically fixedly connected to the upper end of the bottom tube, the upper surface of the blocking block is umbrella-shaped, and three slots are circumferentially opened on the side of the blocking block, the three slots corresponding to the three jaws; The blocking block has an installation space inside, which is connected to the three jaws via a sliding groove. The installation space has a telescopic component inside, which is used to elastically contact the three jaws. An air jet assembly is provided above the blocking block, and the air jet assembly is used to clean the surface of the blocking block. The chuck body has three outgoing ports arranged in a ring, and the outgoing ports are located between two adjacent jaws.

2. The positioning fixture for wheel hub processing according to claim 1, characterized in that, The telescopic component includes a fixed block, three spring tubes, and three contact blocks. The fixed block is disposed inside the installation space. The three spring tubes are respectively fixedly connected to the side of the fixed block. The three contact blocks are respectively fixedly connected to the end of the three spring tubes away from the fixed block and are slidably disposed inside the slide groove.

3. A positioning fixture for wheel hub processing according to claim 2, characterized in that, The chute is inclined on the horizontal plane and is an arc-shaped groove. Both the upper and lower surfaces are parallel to the upper surface of the blocking block. The contact block is an arc-shaped block and is slidably disposed inside the chute.

4. A positioning fixture for wheel hub processing according to claim 2, characterized in that, A guide block is fixedly connected to the upper side of the contact block away from the spring tube. The guide block is fan-shaped and its straight side is inclined to guide material to both sides. Both the contact block and the guide block are made of elastic material.

5. A positioning fixture for wheel hub processing according to claim 1, characterized in that, The jet assembly includes three compression airbags and three nozzles. The three compression airbags are fixedly connected in a ring to the side of the bottom tube, with the compression airbags near the bayonet position. The three nozzles are fixedly connected in a ring to the upper surface of the blocking block, and are respectively facing the three outlet positions. An air guide channel is provided between the bottom tube and the fixed block. The three compression airbags are connected to the air guide channel, and the air guide channel is connected to the three nozzles.

6. A positioning fixture for wheel hub processing according to claim 1, characterized in that, A locking component is provided between the bottom tube and the chuck body, and the locking component is used to fix the position of the bottom tube.

7. A positioning fixture for wheel hub processing according to claim 6, characterized in that, The clamping assembly includes three clamping plates and three clamping seats. The three clamping seats are fixedly connected in a ring to the inner wall of the clamping groove, and the three clamping plates are fixedly connected in a ring to the bottom tube and are respectively disposed between the two compression airbags. The three clamping plates are respectively clamped in the three clamping seats.

8. A positioning fixture for wheel hub processing according to claim 1, characterized in that, The upper surface of the blocking block is higher than the bottom surface of the outlet. The outlet is fan-shaped and the side of the outlet away from the blocking block is tilted downward.

9. A positioning fixture for wheel hub processing according to claim 5, characterized in that, The blocking block has three air inlets in a ring shape on its side. The air inlet of each air inlet is connected to the air guide channel, and the air outlet is close to the outlet, which is used to guide air into the outlet.

10. A positioning fixture for wheel hub processing according to claim 2, characterized in that, Two push plates are symmetrically fixed to both sides of the end of the contact block away from the spring tube. Half of the push plate is fixed to the contact block, and the other half is inclined and set on the outside of the contact block. The push plate is made of elastic material and is used to block and push debris.

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