A double-spindle finishing production line for machining shafts of low-speed electric machines

Abstract

The application relates to the field of double-spindle finishing of low-speed motor shafts, and discloses a double-spindle finishing production line for machining low-speed motor shafts, which comprises a support column, the top end of the support column is fixedly provided with a truss, a numerical control machine tool is arranged between the adjacent support columns below the truss, and a conveying frame is arranged on one side of the numerical control machine tool; a running frame is arranged on the truss, the outer surface of the truss is provided with sliding rails matched with the bottom end of the truss, the running frame is internally provided with a pulley assembly, and the outer surface of the truss is provided with sliding channels matched with the pulley assembly. A plurality of groups of running frames are arranged on the truss, the running frames can move back and forth along the truss through the pulley assemblies, the clamping plate assemblies on the running frames can clamp the finished workpieces, the numerical control machine tools are replaced along the truss, the workers are replaced for replacing the workpieces, the speed of replacing the numerical control machine tools is improved, and the machining efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of dual-spindle precision machining technology for low-speed motor shafts, specifically a dual-spindle precision machining production line for machining low-speed motor shafts. Background Technology

[0002] A low-speed motor is an electric motor designed specifically for low-speed, high-torque applications. Its core feature is that it directly outputs low-speed power or achieves efficient transmission through a built-in reduction mechanism. The low-speed motor spindle is a core drive component designed specifically for low-speed, high-torque applications. It is initially formed by forging or casting, and then precision machined by turning, grinding, and other processes.

[0003] For example, Chinese patent CN119448700B discloses a precision machining device for a generator rotor spindle, including a collection box. The collection box has two side plates on its top, arranged symmetrically front to back. Each side plate has a corresponding groove on one side. Between the two side plates are two movable plates, arranged symmetrically left to right. The front and rear sides of each movable plate are slidably connected to the adjacent groove. A clamping plate is fixedly connected to the top of each movable plate. This invention, through the cooperation of components such as the movable box, limiting plate, electric telescopic rod, fixed frame, spring, sponge block, and mounting plate, enables the movement of a soft baffle when the linkage plate moves, and the movement of the soft baffle can modify... The size of the rectangular opening is changed to block excess soft baffles inside the placement box, while the remaining sponge block can fit against the outside of the rotor spindle, avoiding waste of excess penetrant. However, traditional motor spindle machining in CNC machine tools includes processes such as precision cutting, drilling, and chamfering. Different machining processes need to be performed on different machine tools, requiring workers to remove the workpiece and change equipment after each machining operation. Before machining, the workpiece needs to be positioned using positioning fixtures. During the entire operation, workers need to remove the workpiece, change equipment, and reposition. This process greatly increases the machining time of the motor spindle and reduces machining efficiency. Therefore, a dual-spindle precision machining production line for machining low-speed motor shafts is proposed to solve the above problems. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a dual-spindle precision machining production line for processing low-speed motor shafts, which offers advantages such as increasing the speed of workpiece changeover to CNC machine tools and solving the problem of low efficiency in traditional manual changeover.

[0006] (II) Technical Solution

[0007] To achieve the aforementioned goal of increasing the speed of changing workpieces to CNC machine tools, the present invention provides the following technical solution: a dual-spindle precision machining production line for machining low-speed motor shafts, comprising:

[0008] A support column, the top of which is fixedly installed with a truss, and a CNC machine tool is arranged below the truss between adjacent support columns, and a conveyor frame is arranged on one side of the CNC machine tool;

[0009] A running frame is mounted on a truss. The outer surface of the truss is provided with a slide rail that matches the bottom end of the truss. The interior of the running frame is equipped with a pulley assembly, and the outer surface of the truss is provided with a slide rail that matches the pulley assembly.

[0010] The mounting frame is installed at the front end of the running frame. A lifting frame is longitudinally inserted inside the running frame. A clamping plate assembly for clamping workpieces is fixedly installed at the bottom end of the lifting frame. A flipping component is provided inside the clamping plate assembly, and the clamped workpiece is flipped by the flipping component.

[0011] A baffle is provided on the top outer surface of the support column. A storage groove is provided on the top outer surface of the support column at the baffle. A guide tube is fixedly installed on one side of the bottom end of the baffle, and the baffle is rotatably connected to the inner wall of the storage groove through the guide tube. A limiting component is provided inside the guide tube to limit and fix the baffle.

[0012] Preferably, the CNC machine tool is provided with a base, and two sets of workpiece fixing tables are fixedly installed on the outer surface of the top of the base. The outer surface of the top of the workpiece fixing table is provided with a positioning fixture for positioning the workpiece. When the workpiece is being processed, it is positioned by the positioning fixture on the workpiece fixing table.

[0013] Preferably, a guide frame is fixedly installed inside the CNC machine tool below the base, and the bottom end of the base is slidably connected to the guide frame. A cylinder is installed on one side below the base, and the output shaft of the cylinder is fixedly connected to the bottom end of the base. By activating the cylinder, the base is pushed outward along the guide frame.

[0014] Preferably, the pulley assembly includes a pulley rotatably installed inside the running frame. A drive motor is fixedly installed at the rear end of the running frame, and the output end of the drive motor is fixedly connected to one end of the pulley. When the drive motor on one side of the running frame is started, it drives the internal pulley to roll, causing the running frame to slide along the guide rail on the truss and move the workpiece fixing table above.

[0015] Preferably, a first motor is fixedly installed inside the mounting frame, and a transmission gear is fixedly installed at one end of the output shaft of the first motor. A sliding groove is opened on the outer surface of the lifting frame, and the transmission gear is disposed in the sliding groove. The transmission gear is meshed with one side of the inner wall of the sliding groove. By starting the first motor inside the mounting frame, the transmission gear at one end is driven to rotate, and the transmission gear is meshed with one side of the inner wall of the sliding groove of the lifting frame, causing the lifting frame to slide downward along the mounting frame.

[0016] Preferably, the clamping plate assembly includes a clamping plate body fixedly installed at the bottom of the lifting frame. The clamping plate body is provided with a first clamping arm and a second clamping arm at both ends. A bidirectional cylinder is fixedly installed inside the clamping plate body, and the output shafts at both ends of the bidirectional cylinder are fixedly connected to one end of the first clamping arm and the second clamping arm, respectively. When the bidirectional cylinder inside the clamping plate body is activated, the first clamping arm and the second clamping arm at both ends are driven to retract inward, and clamped and fixed by the first clamping plate and the second clamping plate.

[0017] Preferably, the flipping assembly includes a first clamping plate that rotates inside the first clamping arm, a second clamping plate that is rotatably mounted inside the second clamping arm, a second motor that is fixedly mounted on one outer surface of the first clamping arm, and one end of the output shaft of the second motor that is fixedly connected to the outer surface of the first clamping arm, a positioning block that is fixedly mounted on one outer surface of the first clamping plate, and a positioning groove that matches the positioning block on the outer surface of the second clamping plate. When the first clamping plate and the second clamping plate are clamped, the positioning block on one side of the first clamping plate will be inserted into the positioning groove of the second clamping plate, and then the second motor on one side of the first clamping arm will be started, driving the first clamping plate and the second clamping plate to rotate together, thereby causing the workpiece to flip.

[0018] Preferably, an outer ring is fixedly installed on the outer surface of the conduit, and a sleeve is fitted on one side of the outer surface of the conduit located on the outer ring. Fixing pieces are integrally connected to the four corners of the outer surface of the sleeve. A number of mounting grooves are opened on one side of the outer surface of the baffle and the outer ring, and the mounting grooves are arranged in a ring. Magnetic blocks are embedded in the mounting grooves. The baffle and the outer ring are connected by magnetic attraction. When the baffle is tilted down, the conduit will rotate along the sleeve, and the outer ring will also rotate relative to the sleeve. The corresponding sides of the sleeve and the outer ring are attracted to each other by magnetic blocks. After rotation, the corresponding magnetic block positions are misaligned. When the running frame passes through, the magnetic force of the magnetic blocks will drive the outer ring to rotate and reset, thereby driving the baffle to reset and stand upright.

[0019] Preferably, a retaining post is inserted inside the conduit, and a groove matching one end of the retaining post is formed on the inner wall of the receiving groove. A retaining ring is fixedly installed on the outer surface of the retaining post, and a return spring is sleeved on one side of the outer surface of the retaining post located on the retaining ring. A collar is sleeved on one end of the outer surface of the retaining post located on the return spring. An electromagnet is fixedly installed at one end inside the conduit. When the electromagnet inside the conduit is activated, one end of the retaining post is attracted by the magnetic force of the electromagnet and will retract into the conduit, causing the other end of the retaining post to disengage from the groove on the inner wall of the receiving groove, thereby releasing the baffle from its limiting position.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, the present invention provides a dual-spindle precision machining production line for processing low-speed motor shafts, which has the following beneficial effects:

[0022] 1. By setting multiple sets of running frames on the truss, the running frames can move back and forth along the truss via pulley assemblies. The processed workpieces can be clamped by the clamping plate assemblies on the running frames, and CNC machine tools can be changed along the truss, replacing workers in changing workpieces and increasing the speed of changing CNC machine tools, thereby increasing processing efficiency.

[0023] 2. By setting rotating components on both sides of the clamping arm, the first clamping plate and the second clamping plate can be rotated and flipped together, thereby causing the workpiece to rotate and flip, and the other end of the motor spindle can be processed, increasing the practicality of the clamping plate structure.

[0024] 3. By setting baffles on the truss, the running frame can be intercepted and limited at the corresponding workpiece fixing position to ensure the accuracy of the running frame's stopping position. The limiting structure at the bottom of the baffle is controlled by an electromagnet. When the trolley continues to move, the limit lock of the baffle can be locked by the electromagnet contact, and the trolley can push the baffle down to continue moving forward. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the CNC machine tool in the open state according to the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the base of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the running frame of the present invention;

[0029] Figure 5 This is a schematic diagram of the lifting frame of the present invention;

[0030] Figure 6 This is a schematic diagram of the clamping plate assembly structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the first and second clamping plates of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of the baffle of the base of the present invention;

[0033] Figure 9 This is an exploded view of the installation structure of the baffle of the present invention;

[0034] Figure 10 This is a schematic diagram of the structure of the sleeve of the present invention;

[0035] Figure 11 This is a cross-sectional view of the catheter of the present invention.

[0036] In the diagram: 1. Support column; 11. Truss; 2. CNC machine tool; 21. Base; 22. Workpiece fixing table; 23. Positioning fixture; 24. Cylinder; 25. Guide frame; 3. Running frame; 31. Pulley; 32. Drive motor; 33. Mounting frame; 331. First motor; 332. Transmission gear; 34. Lifting frame; 341. Slide groove; 35. Clamping plate body; 351. Two-way cylinder; 36. First clamping arm; 361. First clamping plate; 362. Positioning block; 37. Second clamping arm; 371. Second clamping plate; 372. Positioning groove; 38. Second motor; 4. Baffle; 41. Guide tube; 42. Outer ring; 43. Sleeve; 431. Fixing plate; 44. Mounting groove; 441. Magnetic block; 45. Clamping post; 451. Retaining ring; 46. Return spring; 47. Collar; 48. Electromagnet; 5. Conveying frame. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] Please see Figure 1-5 The present invention provides the following technical solution: a dual-spindle precision machining production line for processing low-speed motor shafts, including a support column 1, a truss 11 fixedly installed at the top of the support column 1, a CNC machine tool 2 arranged below the truss 11 between adjacent support columns 1, and a conveyor frame 5 arranged on one side of the CNC machine tool 2;

[0040] In this embodiment, the CNC machine tool 2 is provided with a base 21, and two sets of workpiece fixing tables 22 are fixedly installed on the outer surface of the top end of the base 21. The outer surface of the top end of the workpiece fixing table 22 is provided with a positioning fixture 23 for positioning the workpiece. When the workpiece is being processed, the workpiece is positioned by the positioning fixture on the workpiece fixing table 22.

[0041] The CNC machine tool 2 has a guide frame 25 fixedly installed inside the base 21 below it, and the bottom end of the base 21 is slidably connected to the guide frame 25. A cylinder 24 is installed on one side below the base 21, and the output shaft of the cylinder 24 is fixedly connected to the bottom end of the base 21. By starting the cylinder 24, the base is pushed outward along the guide frame 25.

[0042] In this embodiment, the running frame 3 is mounted on the truss 11. The outer surface of the truss 11 is provided with a slide rail that matches the bottom end of the truss 11. The running frame 3 is equipped with a pulley assembly, and the outer surface of the truss 11 is provided with a slide rail that matches the pulley assembly.

[0043] The pulley assembly includes a pulley 31 rotatably installed inside the running frame 3. A drive motor 32 is fixedly installed at the rear end of the running frame 3, and the output end of the drive motor 32 is fixedly connected to one end of the pulley 31. When the drive motor 32 on one side of the running frame 3 is started, it drives the pulley 31 inside to roll, so that the running frame 3 slides along the guide rail on the truss 11, and drives the workpiece fixing table 22 above.

[0044] In this embodiment, the mounting bracket 33 is installed at the front end of the running frame 3, and the lifting frame 34 is longitudinally inserted inside the running frame 3.

[0045] The mounting frame 33 has a first motor 331 fixedly installed inside it. A transmission gear 332 is fixedly installed at one end of the output shaft of the first motor 331. The outer surface of the lifting frame 34 has a sliding groove 341, and the transmission gear 332 is disposed in the sliding groove 341. The transmission gear 332 is meshed with one side of the inner wall of the sliding groove 341. By starting the first motor 331 in the mounting frame 33, the transmission gear 332 at one end is driven to rotate. The transmission gear 332 is meshed with one side of the inner wall of the sliding groove 341 of the lifting frame 34, causing the lifting frame 34 to slide downward along the mounting frame 33.

[0046] The working principle of this embodiment is as follows:

[0047] During processing, the workpiece is positioned by the positioning fixture on the workpiece fixing table 22. After processing, the cabinet door is opened, and the base is pushed outward along the guide frame 25 by starting the cylinder 24. At the same time, the drive motor 32 on one side of the running frame 3 drives the internal pulley 31 to roll, so that the running frame 3 slides along the guide rail on the truss 11. This causes the first motor 331 in the mounting frame 33 above the workpiece fixing table 22 to drive the transmission gear 332 at one end to rotate. The transmission gear 332 meshes with the inner wall of the slide groove 341 of the lifting frame 34, causing the lifting frame 34 to slide downward along the mounting frame 33. The processed workpiece is clamped by the clamping plate assembly at the bottom. Then the lifting frame 34 is moved upward, and the workpiece is moved to the next CNC machine tool 2 for processing by the running frame 3. This cycle is repeated until all processing is completed. Finally, the processed workpiece is placed on the conveyor frame 5 for transport.

[0048] Example 2

[0049] Please see Figure 6-7 The present invention provides the following technical solution: a dual-spindle precision machining production line for processing low-speed motor shafts, including a clamping plate assembly for clamping workpieces fixedly installed at the bottom end of the lifting frame 34, wherein a flipping component is provided inside the clamping plate assembly, and the clamped workpieces are flipped by the flipping component.

[0050] In this embodiment, the clamping plate assembly includes a clamping plate body 35 fixedly installed at the bottom of the lifting frame 34. The clamping plate body 35 has a first clamping arm 36 and a second clamping arm 37 at both ends. A bidirectional cylinder 351 is fixedly installed inside the clamping plate body 35, and the output shafts at both ends of the bidirectional cylinder 351 are fixedly connected to one end of the first clamping arm 36 and the second clamping arm 37, respectively. When the bidirectional cylinder 351 inside the clamping plate body 35 is activated, the first clamping arm 36 and the second clamping arm 37 at both ends are driven to retract inward, and clamped and fixed by the first clamping plate 361 and the second clamping plate 371.

[0051] The flipping assembly includes a first clamping plate 361 that rotates inside the first clamping arm 36, a second clamping plate 371 that is rotatably mounted inside the second clamping arm 37, a second motor 38 that is fixedly mounted on one outer surface of the first clamping arm 36, and one end of the output shaft of the second motor 38 that is fixedly connected to the outer surface of the first clamping arm 36, a positioning block 362 that is fixedly mounted on one outer surface of the first clamping plate 361, and a positioning groove 372 that matches the positioning block 362 on the outer surface of the second clamping plate 371. When the first clamping plate 361 and the second clamping plate 371 are clamped, the positioning block 362 on one side of the first clamping plate 361 will be inserted into the positioning groove of the second clamping plate 371, and then the second motor 38 on one side of the first clamping arm 36 will be started, driving the first clamping plate 361 and the second clamping plate 371 to rotate together, thereby causing the workpiece to flip.

[0052] The working principle of this embodiment is as follows:

[0053] During the clamping process, the bidirectional cylinder 351 inside the clamping plate body 35 can be activated to drive the first clamping arm 36 and the second clamping arm 37 at both ends to retract inward, and clamp and fix them through the first clamping plate 361 and the second clamping plate 371. When the first clamping plate 361 and the second clamping plate 371 are clamped, the positioning block 362 on one side of the first clamping plate 361 will be inserted into the positioning groove of the second clamping plate 371. Then, the second motor 38 on one side of the first clamping arm 36 is activated, and the first clamping plate 361 and the second clamping plate 371 are rotated together by the second motor 38, thereby causing the workpiece to be flipped and then placed and positioned to facilitate further processing of the other end of the workpiece.

[0054] Example 3

[0055] Please see Figure 8-11 The present invention provides the following technical solution: a dual-spindle precision machining production line for processing low-speed motor shafts, including a baffle 4, which is disposed on the top outer surface of a support column 1. A receiving groove is provided on the top outer surface of the support column 1 at the baffle 4. A guide tube 41 is fixedly installed on one side of the bottom end of the baffle 4, and the baffle 4 is rotatably connected to the inner wall of the receiving groove through the guide tube 41. A limiting component is provided inside the guide tube 41 to limit and fix the baffle 4.

[0056] In this example, an outer ring 42 is fixedly installed on the outer surface of the conduit 41. A sleeve 43 is fitted on one side of the outer surface of the conduit 41 and the four corners of the outer surface of the sleeve 43 are integrally connected with fixing pieces 431. Several mounting grooves 44 are opened on one side of the outer surface of the baffle 4 and the outer ring 42, and the several mounting grooves 44 are arranged in a ring. A magnetic block 441 is embedded in the inside of the mounting groove 44. The baffle 4 and the outer ring 42 are attracted to each other by the magnetic block 441. When the baffle 4 falls down, the conduit 41 will rotate along the sleeve 43, and the outer ring 42 will also rotate relative to the sleeve 43. The corresponding sides of the sleeve 43 and the outer ring 42 are attracted to each other by the magnetic block 441. After the rotation, the corresponding magnetic block 441 is misaligned. When the running frame 3 passes through, the magnetic force of the magnetic block 441 will drive the outer ring 42 to rotate and reset, thereby driving the baffle 4 to reset and stand up.

[0057] The conduit 41 has a locking post 45 inserted inside. The inner wall of the receiving groove has a locking groove that matches one end of the locking post 45. A retaining ring 451 is fixedly installed on the outer surface of the locking post 45. A return spring 46 is sleeved on one side of the retaining ring 451 on the outer surface of the locking post 45. A collar 47 is sleeved on one end of the return spring 46 on the outer surface of the locking post 45. An electromagnet 48 is fixedly installed at one end of the conduit 41. When the electromagnet 48 in the conduit 41 is activated, one end of the locking post 45 is attracted by the magnetic force of the electromagnet 48 and will retract into the conduit 41, causing the other end of the locking post 45 to disengage from the locking groove on the inner wall of the receiving groove, thus releasing the restriction on the baffle 4.

[0058] The working principle of this embodiment is as follows:

[0059] As the running frame 3 moves along the truss 11, it is stopped by the baffle 4 on the truss 11. The stopping position corresponds to the workpiece fixing table 22 in the CNC machine tool 2 below, ensuring the accuracy of the clamping structure in clamping or placing the workpiece. The truss 11 has a storage slot at the position of the baffle 4. At the same time, the baffle 4 is rotatably connected to the inner wall of the storage slot through the guide tube 41. When the workpiece is finished and enters the next CNC machine tool 2 for processing, the electromagnet 48 in the guide tube 41 can be activated. One end of the locking pin 45 is attracted by the magnetic force of the electromagnet 48 and will retract into the guide tube 41, causing the other end of the locking pin 45 to disengage from the locking slot on the inner wall of the storage slot, releasing the limitation on the baffle 4. When the running frame 3 continues to move, it will stop the baffle 4. The frame 3 falls to one side and is retracted into the storage slot, allowing it to pass through the baffle 4. As the baffle 4 falls, the guide tube 41 rotates along the sleeve 43, and the outer ring 42 rotates relative to the sleeve 43. The corresponding sides of the sleeve 43 and the outer ring 42 are attracted to each other by the magnetic block 441. After the frame 3 passes through, the magnetic force of the magnetic block 441 will drive the outer ring 42 to rotate and reset, thereby driving the baffle 4 to reset and stand upright. As the locking post 45 is retracted inward, the retaining ring 451 will squeeze the reset spring 46. After the frame 3 passes through, the electromagnet 48 is turned off, and the reset spring 46 will push the locking post 45 out again and insert it into the slot for limit and fixation.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-spindle finishing production line for machining shafts of low-speed electric machines, characterized in that: Include: Support (1), the top end of the support (1) is fixedly installed with a truss (11), and the lower part of the truss (11) is arranged between adjacent supports (1). A numerical control machine tool (2) is arranged on one side of the numerical control machine tool (2). A conveying frame (5) is arranged on the truss (11). The outer surface of the truss (11) is provided with a sliding rail matched with the bottom end of the truss (11). The inside of the running rack (3) is provided with a pulley assembly. The outer surface of the truss (11) is provided with a slide matched with the pulley assembly. The mounting frame (33) is installed at the front end of the running rack (3). The inside of the running rack (3) is longitudinally penetrated by a lifting frame (34). The bottom end of the lifting frame (34) is fixedly installed with a clamping plate assembly for clamping workpieces. The clamping plate assembly is provided with a turnover assembly. The clamped workpieces are turned over by the turnover assembly. The baffle (4) is arranged on the outer surface of the top end of the support (1). The outer surface of the top end of the support (1) is provided with a receiving groove at the baffle (4). The bottom end of the baffle (4) is fixedly installed with a guide pipe (41). The baffle (4) is rotatably connected with the inner wall of the receiving groove through the guide pipe (41). The inside of the guide pipe (41) is provided with a limiting assembly. The baffle (4) is limited and fixed by the limiting assembly. The outer surface of the guide pipe (41) is fixedly installed with an outer ring (42). The outer surface of the guide pipe (41) is sleeved with a sleeve seat (43) on one side of the outer ring (42). The outer surface of the sleeve seat (43) is integrally connected with a fixing piece (431) at the four corners. The baffle (4) and the outer surface of one side of the outer ring (42) are provided with a plurality of mounting grooves (44). The mounting grooves (44) are arranged in a ring shape. The mounting grooves (44) are embedded with magnetic blocks (441). The baffle (4) and the outer ring (42) are connected by the magnetic blocks (441). The inside of the guide pipe (41) is inserted with a clamping column (45). The inner wall of the receiving groove is provided with a clamping groove matched with one end of the clamping column (45). The outer surface of the clamping column (45) is fixedly installed with a stop ring (451). The outer surface of the clamping column (45) is sleeved with a return spring (46) on one side of the stop ring (451). The outer surface of the clamping column (45) is sleeved with a sleeve ring (47) on one end of the return spring (46). The inside of the guide pipe (41) is fixedly installed with an electromagnet (48). The numerical control machine tool (2) is provided with a base (21). The top end of the base (21) is fixedly installed with two groups of workpiece fixing tables (22). The top end of the workpiece fixing table (22) is provided with a positioning tool (23) for positioning workpieces.

2. The double-spindle finishing production line for machining the shaft of a low-speed electric machine according to claim 1, characterized in that: The inside of the numerical control machine tool (2) is fixedly installed with a guide frame (25) below the base (21). The bottom end of the base (21) is slidably connected with the guide frame (25). The base (21) is installed with a cylinder (24) on one side below. The output shaft of the cylinder (24) is fixedly connected with the bottom end of the base (21).

3. The double-spindle finishing line for machining the shafts of low-speed electric machines according to claim 2, characterized in that: ​ 4. The double-spindle finishing production line for machining the shafts of low-speed electric machines according to claim 1, characterized in that: The pulley assembly comprises a pulley (31) rotatably installed inside the running frame (3), the rear end of the running frame (3) is fixedly installed with a driving motor (32), and the output end of the driving motor (32) is fixedly connected with one end of the pulley (31).

5. The double-spindle finishing production line for machining the shafts of low-speed electric machines according to claim 1, characterized in that: The inside of the mounting frame (33) is fixedly installed with a first motor (331), one end of the output shaft of the first motor (331) is fixedly installed with a transmission gear (332), the outer surface of the lifting frame (34) is provided with a sliding groove (341), and the transmission gear (332) is arranged in the sliding groove (341) and is in meshing connection with one side of the inner wall of the sliding groove (341).

6. The double-spindle finishing production line for machining the shafts of low-speed electric machines according to claim 1, characterized in that: The clamping plate assembly comprises a clamping plate body (35) fixedly installed at the bottom end of the lifting frame (34), first clamping arms (36) and second clamping arms (37) are arranged at both ends of the clamping plate body (35), a two-way air cylinder (351) is fixedly installed inside the clamping plate body (35), and the output shafts at both ends of the two-way air cylinder (351) are fixedly connected with one end of the first clamping arms (36) and the second clamping arms (37) respectively.

7. A double-spindle finishing line for machining the shafts of low-speed electric machines according to claim 6, characterized in that: The overturning assembly comprises a first clamping plate (361) rotatably arranged on the inner side of the first clamping arm (36), a second clamping plate (371) rotatably installed on the inner side of the second clamping arm (37), a second motor (38) fixedly installed on one side of the outer surface of the first clamping arm (36), one end of the output shaft of the second motor (38) fixedly connected with the outer surface of the first clamping arm (36), a positioning block (362) fixedly installed on one side of the outer surface of the first clamping plate (361), and a positioning groove (372) matching with the positioning block (362) is arranged on the outer surface of the second clamping plate (371).

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