Surface polishing machine for powder metallurgy workpieces

Abstract

The utility model discloses a powder metallurgy type workpiece surface polisher, including the support pillar, be equipped with the processing device main part above the support pillar, and the processing device main part includes the processing bin, tooth ring and limit mechanism, the processing bin is provided above the support pillar, and the tooth ring is provided the inner side of processing bin, and the limit mechanism is provided with the limit mechanism. The limiting mechanism is arranged at the bottom of the machining bin, and indirect teeth are arranged on the inner side of the machining bin. Relates to the field of gear machining. By arranging the machining device body, the transmission mechanism, the object carrying mechanism and the supporting mechanism, a second gear drives a second threaded sleeve rod to rotate, a clamping block is located above a gear ring, and therefore the gear ring is limited, and through rotation of an object carrying table and bearing connection between a machining bin and a rotating shaft, the machining efficiency is improved. And it is ensured that relative movement is formed between the objective table and the machining bin, at the moment, meshing connection is formed between the gear rings, and grinding of the gear rings is completed.

Description

Technical Field

[0001] The utility model relates to the field of gear processing, in particular to a surface polishing machine for powder metallurgy workpieces. Background Art

[0002] Powder metallurgy is a process technology that produces metal powder or uses metal powder as raw material, forms and sinters it, and manufactures metal materials, composite materials and various types of products. Powder metallurgy is similar to the production of ceramics, both of which belong to powder sintering technology. Therefore, a series of new powder metallurgy technologies can also be used in the preparation of ceramic materials. Due to the advantages of powder metallurgy technology, it has become the key to solving new material problems and plays a pivotal role in the development of new materials.

[0003] In the process of manufacturing the gear ring by powder metallurgy in the prior art, the gear ring needs to be ground and polished. In the prior art, the gear ring is first fixed on the rotating shaft, and then the rotating shaft drives the gear ring to rotate through an external motor. At this time, the gear ring is meshed with the external meshing device, and the gear ring is repeatedly rotated to grind the gear ring.

[0004] In the prior art, when grinding the gear ring, the operator is required to load and unload the gear ring one by one, and when grinding the gear ring, there is no limiting device on the upper and lower sides of the gear ring, so that the gear ring shakes during grinding, thereby increasing the grinding time and easily damaging the teeth of the gear ring. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a surface polishing machine for powder metallurgy workpieces to solve the technical problems mentioned in the above background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a surface polishing machine for powder metallurgy workpieces, comprising a support column, a processing device body is arranged above the support column, and the processing device body includes a processing bin, a gear ring and a limiting mechanism, the processing bin is arranged above the support column, and the gear ring is arranged on the inner side of the processing bin, the limiting mechanism is arranged at the bottom of the processing bin, and indirect teeth are arranged on the inner side of the processing bin.

[0007] By adopting the above technical scheme, the processing chamber is fixed to ensure that the driving gear ring is fixed, thereby ensuring that a meshing connection is formed between the gear ring and the workpiece, thereby ensuring that the workpiece can be polished, and the processing chamber is fixed to ensure that the limiting mechanism is fixed, ensuring that the limiting mechanism releases the limit on the workpiece, thereby completing the unloading of the workpiece.

[0008] The utility model is further configured that a loading mechanism is arranged on the inner side of the processing device body, and the loading mechanism includes a loading platform and a plurality of sets of second limiting rings, the loading platform is arranged on the inner side of the processing chamber, and the second limiting rings are arranged in the middle of the loading platform.

[0009] By adopting the above technical solution, the second limiting ring is ensured to rotate through the rotation of the stage, thereby ensuring that the workpiece is clamped and unloaded.

[0010] The utility model is further configured such that a plurality of groups of protrusions are provided on the outer side of the loading platform, and a circular through groove is provided in the middle of the protrusions provided on the outer side of the loading platform, and indirect teeth are provided at the bottom of the loading platform, the plurality of groups of second limiting rings are provided in the middle of the loading platform, and there is a radius difference between the plurality of groups of second limiting rings, and two symmetrical groups of teeth are provided above the second limiting rings.

[0011] By adopting the above technical solution, multiple groups of protrusions are arranged on the outer side of the worktable, and the circular through grooves are arranged in the middle of the protrusions, which ensures the clamping of the workpiece and the unloading of the workpiece after processing. By setting the second limiting ring, when the worktable rotates, the second limiting ring rotates, thereby ensuring the clamping and release of the workpiece.

[0012] The utility model is further configured as follows: a transmission mechanism is arranged below the processing device body, and the transmission mechanism includes a motor, a rotating shaft and a first limiting ring; the motor is arranged below the processing device body, and the rotating shaft is arranged above the motor; the rotating shaft extends to the inner side of the processing device body, and the rotating shaft and the device body are connected by a bearing; the first limiting ring is arranged at the top end of the motor, and the first limiting ring and the rotating shaft are connected by a bearing.

[0013] By adopting the above technical solution, the rotating shaft is rotated by starting the motor, and the processing device body and the carrying mechanism are rotated synchronously. At this time, the meshing connection between the gear ring arranged on the inner wall of the processing device body and the processing workpiece ensures the grinding of the processing workpiece, and the bearing connection between the first limit ring and the rotating shaft ensures that the first limit ring will not rotate when the rotating shaft rotates, thereby ensuring relative movement between the processing workpiece and the carrying mechanism.

[0014] The utility model is further configured such that a supporting mechanism is arranged above the carrying mechanism, and the supporting mechanism includes a second threaded sleeve, a second threaded rod, a second gear and a clamping block, the second threaded sleeve is arranged on the outside of the first limiting ring, and the second threaded rod is arranged on the inside of the second threaded sleeve, the second gear is arranged on the outside of the second threaded sleeve, and the clamping block is arranged at the end of the second threaded rod.

[0015] By adopting the above technical solution, when the worktable drives the second limit ring to rotate, a meshing connection is formed between the second limit ring and the second gear, ensuring that the second gear is driven to rotate, thereby ensuring a threaded connection between the second threaded sleeve and the second threaded rod. Through the setting of the clamping block, when the second threaded rod is extended and retracted back and forth, the clamping block is driven to move back and forth, thereby ensuring the limitation of the workpiece.

[0016] The utility model is further configured such that the second threaded sleeves are provided with multiple groups, and a second gear is provided on the outer side of each group of the second threaded sleeves, there is a distance difference between the second gears on the outer sides of the multiple groups of the second threaded sleeves and the first limiting ring, and the second gear is meshedly connected with the teeth provided above the second limiting ring.

[0017] By adopting the above technical solution, when the second limiting ring rotates with the stage, it is ensured that a meshing connection is formed between the multiple groups of second limiting rings and the multiple groups of second gears, ensuring that the multiple groups of second gears rotate synchronously. By the distance difference between the second gears and the first limiting ring, it is ensured that a separate meshing connection is formed between each group of second gears and each group of second limiting rings, thereby ensuring that the multiple groups of second gears rotate synchronously when rotating with the second limiting ring.

[0018] The utility model is further configured such that a material unloading mechanism is arranged below the loading mechanism, and the material unloading mechanism includes a load-bearing block, a spring telescopic rod and a baffle, the load-bearing block is arranged on the outside of the loading mechanism, and an arc-shaped slide groove is arranged in the middle of the load-bearing block, the spring telescopic rod is arranged at the end of the load-bearing block, and the baffle is arranged at the end of the load-bearing block.

[0019] By adopting the above technical scheme, the support for the workpiece is ensured by the setting of the supporting block, thereby ensuring the clamping of the workpiece, and the arc-shaped slide groove set in the middle of the supporting block ensures that the supporting block will not be limited during movement, and the force applied by the baffle causes the spring telescopic rod to contract, ensuring the arc-shaped movement of the supporting block, thereby ensuring the unloading of the workpiece.

[0020] The utility model is further configured that the inner wall of the processing chamber is provided with indirect teeth, and there is a distance difference between the indirect teeth provided on the inner wall of the processing chamber and the teeth provided on the bottom of the stage.

[0021] By adopting the above technical solution, the first gear is rotated to rotate the first threaded sleeve, and the threaded connection between the first threaded sleeve and the first threaded rod ensures the up and down movement of the first threaded rod. The up and down movement of the first threaded rod ensures the up and down movement of the extrusion block, thereby completing the limiting of the baffle.

[0022] The utility model is further configured to include a first gear, a first threaded sleeve, a first threaded rod and an extrusion block, and the first gear is arranged below the unloading mechanism, the first threaded sleeve is arranged above the first gear, the first threaded rod is arranged at the top of the first threaded sleeve, and the extrusion block is arranged at the top of the first threaded rod.

[0023] By adopting the above technical solution, the indirect teeth arranged on the inner wall of the processing chamber ensure a meshing connection with the first gear, so that the first threaded rod drives the extrusion block to move downward, releasing the limit on the block. The distance difference between the indirect teeth arranged on the inner wall of the processing chamber and the teeth arranged on the bottom of the stage ensures that the first threaded rod is meshed with the teeth on the inner wall of the processing chamber and the teeth on the bottom of the stage in turn, thereby ensuring the up and down movement of the extrusion block.

[0024] In summary, the utility model mainly has the following beneficial effects:

[0025] 1. The utility model is provided with a processing device main body, a transmission mechanism, a loading mechanism and a supporting mechanism. The motor drives the rotating shaft to rotate, thereby driving the loading platform to rotate, so that the second limiting ring is rotated. At this time, the second limiting ring is rotated and the meshing connection between the second limiting ring and the second gear is made, so that the second gear drives the second threaded sleeve to rotate, so that the second threaded rod drives the clamping block to move outward. At this time, the middle slide groove of the clamping block passes through the feeding rod, and the clamping block is above the gear ring, so as to limit the gear ring. At this time, the loading platform is rotated and the bearing connection between the processing chamber and the rotating shaft is used to ensure relative movement between the loading platform and the processing chamber. At this time, the meshing connection between the gear rings completes the grinding of the gear rings.

[0026] 2. The utility model is provided with a processing device main body, a loading mechanism and a unloading mechanism. When the loading platform rotates, the meshing connection formed between the teeth at the bottom of the loading platform and the first gear makes the first gear drive the first threaded sleeve to rotate, so that the first threaded rod drives the extrusion block to move upward. At this time, the extrusion block contacts the baffle plate, and the unloading mechanism is driven by the loading platform to continuously rotate, so that the baffle plate is stressed, so that the spring telescopic rod contracts, and the bearing block passes through the middle arc-shaped slide groove, so that the bearing block moves in a circle, and the workpiece falls from the top of the bearing block, thereby completing the unloading of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0028] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0029] Figure 3 It is a structural schematic diagram of the transmission mechanism of the utility model;

[0030] Figure 4 This is a schematic diagram of the connection structure between the loading mechanism and the supporting mechanism of the utility model;

[0031] Figure 5 It is a schematic diagram of the enlarged structure of point A of the utility model;

[0032] Figure 6 It is a cross-sectional view of the main body of the processing device of the utility model;

[0033] Figure 7 It is a schematic diagram of the enlarged structure of point B of the utility model.

[0034] In the figure: 1. processing device body; 101. processing chamber; 102. gear ring; 103. limiting mechanism; 1031. first gear; 1032. first threaded sleeve; 1033. first threaded rod; 1034. extrusion block; 2. support column; 3. transmission mechanism; 301. motor; 302. rotating shaft; 303. first limiting ring; 4. loading mechanism; 401. loading platform; 402. second limiting ring; 5. supporting mechanism; 501. second threaded sleeve; 502. second threaded rod; 503. second gear; 504. clamping block; 6. unloading mechanism; 601. loading block; 602. spring telescopic rod; 603. baffle; 7. loading rod; 8. workpiece. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0036] The following describes an embodiment of the utility model based on its overall structure.

[0037] Example 1

[0038] A surface polishing machine for powder metallurgy workpieces, such as Figure 1 , Figure 2 and Figure 6As shown, it includes a support column 2, a processing device body 1 is arranged above the support column 2, and the processing device body 1 includes a processing bin 101, a gear ring 102 and a limiting mechanism 103. The processing bin 101 is arranged above the support column 2, and the gear ring 102 is arranged on the inner side of the processing bin 101. The processing bin 101 is fixed to ensure that the gear ring 102 is fixed, thereby ensuring that the gear ring 102 and the workpiece are meshed and connected, thereby ensuring that the workpiece is polished. The limiting mechanism 103 is arranged at the bottom of the processing bin 101, and indirect teeth are arranged on the inner side of the processing bin 101. The processing bin 101 is fixed to ensure that the limiting mechanism 103 is fixed, and it is ensured that the limiting mechanism 103 releases the limit on the workpiece, thereby completing the unloading of the workpiece.

[0039] See also Figure 1 , Figure 2 , Figure 4 and Figure 5 A loading mechanism 4 is arranged on the inner side of the processing device body 1, and the loading mechanism 4 includes a loading platform 401 and multiple sets of second limiting rings 402. The loading platform 401 is arranged on the inner side of the processing chamber 101, and the second limiting rings 402 are arranged in the middle of the loading platform 401. By rotating the loading platform 401, the second limiting ring 402 is ensured to rotate, thereby ensuring that the workpiece is clamped and unloaded.

[0040] See also Figure 4 and Figure 5 A plurality of groups of protrusions are arranged on the outer side of the stage 401, and a circular through groove is arranged in the middle of the protrusions arranged on the outer side of the stage 401. By arranging a plurality of groups of protrusions on the outer side of the stage 401 and a circular through groove in the middle of the protrusions, the clamping of the workpiece and the unloading of the workpiece after the processing are completed are ensured, and indirect teeth are arranged on the bottom of the stage 401, a plurality of groups of second limiting rings 402 are arranged in the middle of the stage 401, and there is a radius difference between the plurality of groups of second limiting rings 402, and two symmetrical groups of teeth are arranged above the second limiting rings 402. By setting the second limiting rings 402, when the stage 401 rotates, the second limiting rings 402 rotates, thereby ensuring the clamping and loosening of the workpiece.

[0041] See also Figure 2 and Figure 3A transmission mechanism 3 is arranged below the processing device body 1, and the transmission mechanism 3 includes a motor 301, a rotating shaft 302 and a first limiting ring 303. The motor 301 is arranged below the processing device body 1, and the rotating shaft 302 is arranged above the motor 301. The rotating shaft 302 extends to the inner side of the processing device body 1, and the rotating shaft 302 and the device body 1 are connected by a bearing. The first limiting ring 303 is arranged at the top of the motor 301. By starting the motor 301, the rotating shaft 302 is rotated. The processing device body 1 and the carrier mechanism 4 rotate synchronously at the same time. At this time, the meshing connection between the toothed ring 102 arranged on the inner wall of the processing device body 1 and the workpiece ensures the grinding of the workpiece, and the first limit ring 303 and the rotating shaft 302 are connected by a bearing. The bearing connection between the first limit ring 303 and the rotating shaft 302 ensures that when the rotating shaft 302 rotates, the first limit ring 303 will not rotate, thereby ensuring relative movement between the workpiece and the carrier mechanism 4.

[0042] See also Figure 1 , Figure 2 , Figure 4 and Figure 5 A supporting mechanism 5 is arranged above the carrying mechanism 4, and the supporting mechanism 5 includes a second threaded sleeve 501, a second threaded rod 502, a second gear 503 and a clamping block 504. The second threaded sleeve 501 is arranged on the outer side of the first limiting ring 303, and the second threaded rod 502 is arranged on the inner side of the second threaded sleeve 501, and the second gear 503 is arranged on the outer side of the second threaded sleeve 501. When the carrying platform 401 drives the second limiting ring 402 to rotate, the second limiting ring 402 and the second gear 503 are meshed and connected, ensuring that the second gear 503 is driven to rotate, thereby ensuring that the second threaded sleeve 501 and the second threaded rod 502 are threadedly connected, and the clamping block 504 is arranged at the end of the second threaded rod 502. Through the setting of the clamping block 504, when the second threaded rod 502 is extended and retracted back and forth, the clamping block 504 is driven to move back and forth, thereby ensuring the limitation of the workpiece.

[0043] See also Figure 4 and Figure 5, there are multiple groups of second threaded sleeves 501, and a second gear 503 is arranged on the outside of each group of second threaded sleeves 501. When the second limiting ring 402 rotates with the worktable 401, it is ensured that the multiple groups of second limiting rings 402 and the multiple groups of second gears 503 are meshed and connected, ensuring that the multiple groups of second gears 503 rotate synchronously. There is a distance difference between the second gears 503 on the outside of the multiple groups of second threaded sleeves 501 and the first limiting ring 303, and the second gears 503 are meshed and connected with the teeth arranged above the second limiting ring 402. The distance difference between the second gears 503 and the first limiting ring 303 ensures that each group of second gears 503 and each group of second limiting rings 402 form a separate meshing connection, thereby ensuring that the multiple groups of second gears 503 rotate synchronously when they rotate with the second limiting ring 402.

[0044] See also Figure 2 , Figure 6 and Figure 7 A material unloading mechanism 6 is arranged below the carrying mechanism 4, and the material unloading mechanism 6 includes a bearing block 601, a spring telescopic rod 602 and a baffle 603. The bearing block 601 is arranged on the outside of the carrying mechanism 4, and an arc-shaped slide groove is arranged in the middle of the bearing block 601. The setting of the bearing block 601 ensures support for the workpiece, thereby ensuring clamping the workpiece, and the arc-shaped slide groove arranged in the middle of the bearing block 601 ensures that the bearing block 601 will not be limited during movement. The spring telescopic rod 602 is arranged at the end of the bearing block 601, and the baffle 603 is arranged at the end of the bearing block 601. The force applied to the baffle 603 causes the spring telescopic rod 602 to contract, ensuring that the bearing block 601 is driven to move in an arc shape, thereby ensuring the unloading of the workpiece.

[0045] Example 2

[0046] See also Figure 6 and Figure 7 , which is the second embodiment of the present utility model, specifically further illustrating the processing device body 1, the limiting mechanism 103 includes a first gear 1031, a first threaded sleeve rod 1032, a first threaded rod 1033 and an extrusion block 1034, and the first gear 1031 is arranged below the unloading mechanism 6, the first threaded sleeve rod 1032 is arranged above the first gear 1031, and the first threaded rod 1033 is arranged at the top of the first threaded sleeve rod 1032, and the first gear 1031 is rotated, so that the first threaded sleeve rod 1032 is rotated, and the threaded connection between the first threaded sleeve rod 1032 and the first threaded rod 1033 ensures the up and down movement of the first threaded rod 1033, and the extrusion block 1034 is arranged at the top of the first threaded rod 1033, and the up and down movement of the first threaded rod 1033 ensures that the extrusion block 1034 is driven to move up and down, thereby completing the limiting of the baffle 603.

[0047] See also Figure 5 , Figure 6 and Figure 7 The inner wall of the processing chamber 101 is provided with indirect teeth. The indirect teeth provided on the inner wall of the processing chamber 101 ensure a meshing connection with the first gear 1031, so that the first threaded rod 1033 drives the extrusion block 1034 to move downward, releasing the limit of the block 603, and there is a distance difference between the indirect teeth provided on the inner wall of the processing chamber 101 and the teeth provided at the bottom of the stage 401. The indirect teeth provided on the inner wall of the processing chamber 101 and the teeth provided at the bottom of the stage 401 have a distance difference, which ensures that the first threaded rod 1033 is meshed with the teeth on the inner wall of the processing chamber 101 and the teeth on the bottom of the stage 401 in turn, thereby ensuring the up and down movement of the extrusion block 1034.

[0048] The working principle of the utility model is as follows: when it is necessary to polish the gear, the operator firstly sleeves the processed gear on the loading rod 7, and at this time, the gear passes through the loading rod 7 through the circular ring in the middle of the gear ring, and falls to the top of the bearing block 601 by the gravity of the gear ring, and then the motor 301 is started, and the motor 301 drives the rotating shaft 302 to rotate, thereby driving the loading platform 401 to rotate, so that the second limiting ring 402 is rotated, and at this time, through the rotation of the second limiting ring 402 and the meshing connection between the second limiting ring 402 and the second gear 503, the second gear 503 drives the second threaded sleeve rod 501 to rotate, so that the second threaded rod 502 drives the clamping block 50 4 moves outward, at this time, the middle slide groove of the clamping block 504 passes through the feeding rod 7, and the clamping block 504 is above the gear ring, so as to limit the gear ring. At this time, the rotation of the stage 401 and the bearing connection between the processing chamber 101 and the rotating shaft 302 ensure the relative movement between the stage 401 and the processing chamber 101. At this time, the meshing connection between the gear ring 102 and the gear ring is completed to grind the gear ring. After the second limiting ring 402 rotates a certain angle, the workpiece 8 is meshed with the gear ring 102 for multiple times, so as to complete the grinding and polishing of the workpiece 8. Then, the motor 301 is reversed to make the clamping block 504 shrink and release the restriction on the workpiece 8.

[0049] Furthermore, when the worktable 401 rotates, the meshing connection between the teeth at the bottom of the worktable 401 and the first gear 1031 is formed, so that the first gear 1031 drives the first threaded sleeve 1032 to rotate, so that the first threaded rod 1033 drives the extrusion block 1034 to move upward. At this time, the extrusion block 1034 contacts the baffle 603, and the unloading mechanism 6 is driven by the worktable 401 to continuously rotate, so that the baffle 603 is subjected to force, so that the spring telescopic rod 602 contracts, and the supporting block 601 passes through the middle arc-shaped slide groove, so that the supporting block 601 moves in a circle, and the workpiece 8 falls from the top of the supporting block 601, thereby completing the unloading of the workpiece 8.

[0050] Although an embodiment of the utility model has been shown and described, this specific embodiment is merely an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A surface polishing machine for a powder metallurgy workpiece, comprising a support column (2), characterized in that: A processing device body (1) is arranged above the support column (2), and the processing device body (1) comprises a processing chamber (101), a toothed ring (102) and a limiting mechanism (103); the processing chamber (101) is arranged above the support column (2), and the toothed ring (102) is arranged on the inner side of the processing chamber (101); the limiting mechanism (103) is arranged at the bottom of the processing chamber (101), and indirect teeth are arranged on the inner side of the processing chamber (101).

2. The surface polishing machine for powder metallurgy workpiece according to claim 1, characterized in that: A loading mechanism (4) is arranged on the inner side of the processing device body (1), and the loading mechanism (4) comprises a loading platform (401) and a plurality of sets of second limiting rings (402); the loading platform (401) is arranged on the inner side of the processing chamber (101), and the second limiting rings (402) are arranged in the middle of the loading platform (401).

3. The surface polishing machine for powder metallurgy workpiece according to claim 2, characterized in that: The outer side of the stage (401) is provided with a plurality of groups of protrusions, and a circular through groove is provided in the middle of the protrusions provided on the outer side of the stage (401), and indirect teeth are provided at the bottom of the stage (401), the plurality of groups of second limiting rings (402) are provided in the middle of the stage (401), and there is a radius difference between the plurality of groups of second limiting rings (402), and two symmetrical groups of teeth are provided above the second limiting rings (402).

4. The surface polishing machine for powder metallurgy workpiece according to claim 1, characterized in that: A transmission mechanism (3) is arranged below the processing device body (1), and the transmission mechanism (3) comprises a motor (301), a rotating shaft (302) and a first limiting ring (303); the motor (301) is arranged below the processing device body (1), and the rotating shaft (302) is arranged above the motor (301); the rotating shaft (302) extends to the inner side of the processing device body (1), and the rotating shaft (302) and the device body (1) are connected by a bearing; the first limiting ring (303) is arranged at the top end of the motor (301), and the first limiting ring (303) and the rotating shaft (302) are connected by a bearing.

5. The surface polishing machine for powder metallurgy workpiece according to claim 2, characterized in that: A support mechanism (5) is arranged above the object-carrying mechanism (4), and the support mechanism (5) comprises a second threaded sleeve (501), a second threaded rod (502), a second gear (503) and a clamping block (504); the second threaded sleeve (501) is arranged on the outside of the first limiting ring (303), and the second threaded rod (502) is arranged on the inside of the second threaded sleeve (501); the second gear (503) is arranged on the outside of the second threaded sleeve (501), and the clamping block (504) is arranged at the end of the second threaded rod (502).

6. The surface polishing machine for powder metallurgy workpiece according to claim 5, characterized in that: The second threaded sleeve rods (501) are provided with multiple groups, and a second gear (503) is provided on the outer side of each group of the second threaded sleeve rods (501), there is a distance difference between the second gears (503) on the outer sides of the multiple groups of the second threaded sleeve rods (501) and the first limiting ring (303), and the second gear (503) is meshedly connected with the teeth provided on the upper side of the second limiting ring (402).

7. The surface polishing machine for powder metallurgy workpiece according to claim 2, characterized in that: A material discharge mechanism (6) is arranged below the object-carrying mechanism (4), and the material discharge mechanism (6) comprises a bearing block (601), a spring telescopic rod (602) and a baffle (603); the bearing block (601) is arranged on the outside of the object-carrying mechanism (4), and an arc-shaped sliding groove is arranged in the middle of the bearing block (601); the spring telescopic rod (602) is arranged at the end of the bearing block (601), and the baffle (603) is arranged at the end of the bearing block (601).

8. The surface polishing machine for powder metallurgy workpiece according to claim 2, characterized in that: The inner wall of the processing chamber (101) is provided with indirect teeth, and there is a distance difference between the indirect teeth provided on the inner wall of the processing chamber (101) and the teeth provided on the bottom of the stage (401).

9. The surface polishing machine for powder metallurgy workpiece according to claim 1, characterized in that: The (103) comprises a first gear (1031), a first threaded sleeve (1032), a first threaded rod (1033) and an extrusion block (1034), wherein the first gear (1031) is arranged below the unloading mechanism (6), the first threaded sleeve (1032) is arranged above the first gear (1031), the first threaded rod (1033) is arranged at the top end of the first threaded sleeve (1032), and the extrusion block (1034) is arranged at the top end of the first threaded rod (1033).

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