A machining lathe for a floating upper pressing plate for pressing a cylindrical gear end face

Abstract

The application discloses a lathe for machining of a floating upper pressing plate for cylindrical gear end face pressing, and relates to the technical field of lathes, which comprises a lathe, a spindle box and a chuck. The chuck is used for clamping the upper pressing plate and driving the upper pressing plate to rotate to realize turning. A display structure is arranged on one side of the chuck on the spindle box. The display structure is used for displaying the real-time turning quantity of the upper pressing plate. The display structure is triggered in linkage with the action of clamping the upper pressing plate by the chuck. The display structure comprises a quantitative reminding assembly. The quantitative reminding assembly is used for reminding an operator to replace a turning tool when the upper pressing plate reaches a specified turning quantity. An opening is arranged on a coding belt at a specified number of pieces corresponding to the rated service life of the turning tool. When the coding belt is wound to the specified number of pieces, a pressing block enters the opening and acts on a pressing switch to trigger an alarm and automatically remind the operator to replace the turning tool in time.

Description

Technical Field

[0001] This application relates to the field of lathe technology, and in particular to a lathe for machining a floating upper pressure plate for clamping the end face of cylindrical gears. Background Technology

[0002] In gear transmission systems, the floating upper pressure plate used for clamping the end face of cylindrical gears is a key component to ensure the axial positioning and end face clamping accuracy of the gears. Currently, the machining of this type of upper pressure plate is completed by lathe turning.

[0003] In existing continuous batch turning, the number of upper pressure plates machined is directly related to the service life of the cutting tool. Taking carbide cutting tools as an example, when machining this type of upper pressure plate, the tool wears down to the dull standard after machining about 200 pieces. If the cutting tool is not replaced in time and machining continues, machining defects such as chatter marks and dimensional deviations will appear on the end face of the upper pressure plate. Therefore, operators need to accurately grasp the number of pieces machined so that the cutting tool can be replaced when it reaches its rated life.

[0004] However, existing lathes lack quantitative counting and reminder functions synchronized with the turning cycle. Operators mainly rely on manual stop-and-count or electronic counters to keep track of the number of workpieces. Manual counting is prone to omissions and errors due to fatigue and distraction during long-term operation. Although electronic counters can achieve automatic counting, they require power supply and sensor circuitry, increasing costs. Furthermore, the lathe machining environment makes it difficult to guarantee the reliability of electronic counters.

[0005] In summary, existing lathes urgently need a mechanical structure that can synchronize with the turning cycle, display the number of parts processed in real time, and automatically remind users when the specified number of parts corresponding to the rated tool life is reached. Summary of the Invention

[0006] Therefore, it is necessary to provide a lathe that can actively remind users when the cutting tool reaches a specified wear level, in order to address the above-mentioned technical problems.

[0007] To achieve the above objectives, this application provides the following technical solution: a lathe for machining a floating upper pressure plate for clamping the end face of a cylindrical gear, comprising: a lathe, a headstock, and a chuck. The chuck is used to clamp the upper pressure plate and drive it to rotate for turning. A display structure is installed on one side of the chuck on the headstock. The display structure is used to display the real-time turning quantity of the upper pressure plate. The display structure is triggered by the action of the chuck clamping the upper pressure plate. The display structure includes a quantitative reminder component, which reminds the operator to change the cutting tool when the upper pressure plate reaches a specified turning quantity. The display structure includes a stop bar, and an anti-interference structure is provided at the bottom of the stop bar. The anti-interference structure is achieved by the centrifugal force generated when the chuck rotates. The anti-interference structure is used to eliminate frictional interference between the stop bar and the upper pressure plate to ensure normal rotation of the chuck.

[0008] Preferably, the display structure further includes a first vertical groove on the spindle box, the stop rod is slidably connected in the first vertical groove, the first vertical groove is connected to the stop rod by a return spring, one end of the stop rod is fixed with a rack, the spindle box is rotatably connected with a gear by a damping shaft, the gear is fixed with a first disc, and wedge-shaped blocks are distributed around the circumference of the first disc.

[0009] Preferably, two support plates are fixed on the spindle box, and a winding shaft and a release shaft are rotatably mounted on the two support plates respectively. A square rod is slidably connected inside the winding shaft. The winding shaft is connected to the square rod through a first spring. A second disk is fixed to one end of the square rod. Wedge-shaped grooves are distributed around the circumference of the second disk.

[0010] Preferably, a spool is inserted into the outside of the release shaft, the outside of the spool is a rolled-up coded tape, two limiting rods are fixed on the main shaft box, and one end of the coded tape passes through the two limiting rods and is wound around the take-up shaft.

[0011] Preferably, the quantitative reminder component includes a pad with two limit rods fixed at the bottom, a first push switch and a limit block are installed on the top surface of the pad, an alarm is installed on the bottom surface of the pad, and the first push switch is electrically connected to the alarm.

[0012] Preferably, a hollow cylinder is fixed to the top surface of one of the limiting rods, and a bent tube is slidably connected inside the hollow cylinder. The hollow cylinder is connected to the bent tube by a second spring, and a pressure block is fixed to one end of the bent tube. The pressure block is in contact with the surface of the coding tape.

[0013] Preferably, the coding strip has an opening, and the pressure block cooperates with the opening to provide a reminder.

[0014] Preferably, the anti-interference structure includes grooves distributed on the surface of the chuck, a sliding groove at the bottom of the groove, a first magnet slidably connected along the sliding groove in the groove, a third spring connected to the first magnet in the sliding groove, a mounting plate fixed on the spindle box, a sliding rod slidably connected on the mounting plate, a second magnet fixed at the end of the sliding rod, a fourth spring provided on the outside of the sliding rod, and a second push switch mounted on the mounting plate.

[0015] Preferably, the bottom of the stop bar is provided with a second vertical groove, and a vertical rod is slidably connected along the second vertical groove, and a protrusion is fixed on the vertical rod.

[0016] Preferably, a horizontal plate is fixed to the bottom end of the stop bar, and a sliding plate is slidably connected to the horizontal plate through a set horizontal groove. The horizontal groove is connected to the sliding plate through a No. 5 spring. An iron block is fixed to one end of the sliding plate. An electromagnet is installed on the horizontal plate. The electromagnet is electrically connected to a No. 2 push switch. The sliding plate is provided with a communicating flat groove and an inclined groove. The protrusion is located in the flat groove.

[0017] In summary, the present invention has the following beneficial effects:

[0018] 1. This invention utilizes the upward movement of the stop lever to drive the rack, gear, and winding shaft to rotate and drive the coded tape to wind in one direction, so that the numbers on the coded tape are displayed sequentially below the pressure block, realizing real-time display of the number of turned parts. Operators can keep track of the number of parts processed at any time without stopping the machine or relying on electronic equipment.

[0019] 2. This invention provides an opening on the coding tape at a specified number of pieces corresponding to the rated life of the cutting tool. When the coding tape is wound up to the specified number of pieces, the pressure block enters the opening and acts on the push switch to trigger an alarm, automatically reminding the operator to replace the cutting tool in time. Moreover, this structure is purely mechanically triggered and is not affected by circuits or the processing environment.

[0020] 3. By eliminating interference when the vertical rod contacts the upper pressure plate, abnormal vibration can be avoided, which can lead to abnormal accelerated wear of the cutting tool and ensure accurate correspondence between the displayed quantity and the actual wear process of the cutting tool. Attached Figure Description

[0021] Figure 1 This is an exterior drawing of the lathe.

[0022] Figure 2 for Figure 1 Schematic diagram of the structure at the central spindle box;

[0023] Figure 3 for Figure 2 Schematic diagram of a partial structure;

[0024] Figure 4 for Figure 3 Schematic diagram of a partial structure;

[0025] Figure 5 for Figure 2 A schematic diagram of the structure at the chuck;

[0026] Figure 6 for Figure 3 A diagram showing the display angle after rotation;

[0027] Figure 7 for Figure 6 Enlarged view of point A;

[0028] Figure 8 This is a schematic diagram showing the fit between the support plate and the release shaft.

[0029] Figure 9 for Figure 3 A schematic diagram of a local structure in the image;

[0030] Figure 10 for Figure 9 A breakdown diagram, including a schematic of the inside of the reel;

[0031] Figure 11 for Figure 3 Schematic diagram of hollow cylinder and bent pipe in the diagram;

[0032] Figure 12 This is a schematic diagram of the opening on the encoding strip.

[0033] In the diagram: 1. Lathe; 2. Headstock; 3. Chuck; 201. Stop bar; 202. Vertical slot 1; 203. Rack; 204. Gear; 205. Disc 1; 206. Wedge block; 207. Support plate; 208. Rewind shaft; 209. Release shaft; 210. Square rod; 211. Spring 1; 212. Disc 2; 213. Wedge groove; 214. Drum; 215. Encoding tape; 216. Limit bar; 217. Return spring; 2001. Pad; 2002. Push-button switch 1; 2003. Limit block; 2004. Alarm; 200 5. Hollow cylinder; 2006. Bend; 2007. Spring No. 2; 2008. Pressure block; 2009. Opening; 301. Groove; 302. Slide groove; 303. Magnet No. 1; 304. Spring No. 3; 305. Mounting plate; 306. Slide rod; 307. Magnet No. 2; 308. Spring No. 4; 309. Push-button switch No. 2; 310. Vertical groove No. 2; 311. Vertical rod; 312. Protrusion; 313. Horizontal plate; 314. Horizontal groove; 315. Spring No. 5; 316. Iron block; 317. Electromagnet; 318. Flat groove; 319. Inclined groove; 320. Slide plate. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0035] Example: Refer to Figure 1-12 The lathe shown is for machining a floating upper pressure plate for clamping the end face of a cylindrical gear, including: a lathe 1, a spindle box 2, and a chuck 3. The chuck 3 is used to clamp the upper pressure plate and drive the upper pressure plate to rotate to achieve turning.

[0036] The distinguishing features of the present invention are described below:

[0037] A display structure is installed on one side of the chuck 3 on the spindle box 2. The display structure is used to display the real-time turning quantity of the upper pressure plate. The display structure is triggered by the action of the chuck 3 clamping the upper pressure plate. The display structure includes a quantitative reminder component, which is used to remind the operator to change the cutting tool when the upper pressure plate reaches the specified turning quantity. The display structure includes a stop bar 201. An anti-interference structure is set at the bottom of the stop bar 201. The anti-interference structure is achieved by the centrifugal force generated when the chuck 3 rotates. The anti-interference structure is used to eliminate the frictional interference between the stop bar 201 and the upper pressure plate to ensure the normal rotation of the chuck 3.

[0038] As one embodiment of this invention, the display structure includes a first vertical groove 202 provided on the spindle box 2, a stop rod 201 slidably connected in the first vertical groove 202, a rack 203 fixed at one end of the stop rod 201, a gear 204 rotatably connected to the spindle box 2 via a damping shaft, a first disk 205 fixed on the gear 204, and wedge blocks 206 distributed circumferentially on the first disk 205.

[0039] Two support plates 207 are fixed on the spindle box 2. A take-up shaft 208 and a release shaft 209 are rotatably mounted on the two support plates 207 respectively. A square rod 210 is slidably connected inside the take-up shaft 208. The take-up shaft 208 is connected to the square rod 210 through a first spring 211. A second disc 212 is fixed to one end of the square rod 210. Wedge-shaped grooves 213 are distributed around the circumference of the second disc 212. A drum 214 is inserted into the outside of the release shaft 209. The outside of the drum 214 is a rolled coding tape 215. Two limiting rods 216 are fixed on the spindle box 2. One end of the coding tape 215 passes through the two limiting rods 216 and is wound around the take-up shaft 208.

[0040] The quantitative reminder component includes two limit rods 216 and a base plate 2001 fixed at the bottom. A first push switch 2002 and a limit block 2003 are installed on the top surface of the base plate 2001, and an alarm 2004 is installed on the bottom surface of the base plate 2001. The first push switch 2002 and the alarm 2004 are electrically connected.

[0041] Next, a hollow cylinder 2005 is fixed to the top surface of one of the limiting rods 216. A bent tube 2006 is slidably connected inside the hollow cylinder 2005. The hollow cylinder 2005 is connected to the bent tube 2006 through a second spring 2007. A pressure block 2008 is fixed to one end of the bent tube 2006. The pressure block 2008 is in contact with the surface of the coding tape 215. An opening 2009 is provided on the coding tape 215. The pressure block 2008 and the opening 2009 cooperate to provide a reminder. The diameter of the opening 2009 is larger than the diameter of the pressure block 2008.

[0042] It should be noted that the stop lever 201 is located directly in front of the chuck 3. Therefore, when the chuck 3 clamps the pressure plate, the stop lever 201 must be lifted upwards to provide clearance for clamping the pressure plate. The present invention is designed such that the clearance height of lifting the stop lever 201 is greater than the length of the rack 203. The purpose is to ensure that the rack 203 can pass completely through the gear 204 each time the worker lifts the stop lever 201 upwards. This ensures that the gear 204 rotates at the same angle each time the pressure plate is clamped, thereby ensuring the accuracy of the display structure implementation.

[0043] Specifically, lifting the stop lever 201 causes it to move along the first vertical groove 202, which in turn moves the rack 203, driving the gear 204 to rotate. As can be seen, the rotation angle of the gear 204 is the same. The rotation of the gear 204 causes the first disc 205 to rotate. When the stop lever 201 is lifted, the first disc 205 rotates counterclockwise via the gear 204. Figure 3 As can be seen, when rotating counterclockwise, the wedge block 206 on the first disk 205 is blocked by the straight edge of the wedge groove 213 on the second disk 212, forming a lock. This causes the first disk 205 to rotate in reverse, along with the second disk 212 and the square rod 210. Since the square rod 210 is inserted into the take-up shaft 208, the take-up shaft 208 will rotate in reverse simultaneously, thereby winding up the coding tape 215.

[0044] As can be seen from the above, since the rotation angle is the same, the length of the coding tape 215 wound up by the winding shaft 208 each time is the same.

[0045] The coding strip 215 has equidistantly distributed numbers “0, 1, 2, 3, ..., n”. In the initial state, “0” is located below the transparent pressure block 2008. As can be seen from the above, the coding strip 215 is wound up once every time the chuck 3 clamps the upper pressure plate. Then “1” comes to the bottom of the pressure block 2008. At this time, the number of upper pressure plates being turned can be displayed. This process is repeated to display the number of processing operations.

[0046] After the stop lever 201 is raised and the upper pressure plate is installed, the stop lever 201 will be manually released. Then, under the action of the return spring 217, the stop lever 201 will descend. At this time, the vertical rod 311 will abut against the side of the upper pressure plate. The purpose here is that when the upper pressure plate is removed from the chuck 3, the vertical rod 311 can return to its original position under the return force of the remaining return spring 217. Figure 2 The initial position of the display forms a clamping barrier, the purpose of which is to force the stop lever 201 upward each time the pressure plate is clamped, thereby preventing errors in the display structure.

[0047] In addition, when the stop lever 201 descends with the rack 203, it will cause the gear 204 to rotate clockwise. Since the spindle box 2 and the gear 204 are connected by a damping shaft, the gear 204 can be locked and positioned after rotation, so that the rack 203 can accurately mesh with the gear 204 when returning. When rotating clockwise, the wedge block 206 presses the inclined side of the wedge groove 213, and then the square rod 210 moves in the winding shaft 208. At this time, the winding shaft 208 will not rotate to prevent the winding coding tape 215 from being released. Thus, through the cooperation of the above structure, the unidirectional rotation of the winding shaft 208 is realized, ensuring the feasibility of the display structure.

[0048] The numbers displayed on the coding strip 215 allow operators to keep track of the current machining quantity at all times, so as to know the wear of the cutting tool and be aware of the situation. In addition, the digital display also allows operators to check the current number on the coding strip 215 with the remaining number of upper pressure plates to be machined, thereby planning the timing of tool changes, upper pressure plate replenishment and subsequent machining arrangements in advance, and avoiding excessively long turning interruptions due to insufficient preparation.

[0049] Taking the rated life of the cutting tool of this invention corresponding to the machining of 200 upper pressure plates as an example, in the initial state, such as Figure 3 , 6 As shown in Figure 7, since the second spring 2007 inside the hollow cylinder 2005 is in a stretched state, the bent tube 2006 and the pressure block 2008 are lifted. The pressure block 2008 is blocked and reset by the straightened coding tape 215, thus keeping the pressure block 2008 in a lifted state.

[0050] During turning, as the coding tape 215 is continuously wound up, the number "200" will also come to the bottom of the pressure block 2008. Since there is an opening 2009 at this time, when the opening 2009 moves to the bottom of the pressure block 2008, the coding tape 215 can no longer block the pressure block 2008 from resetting. Then, under the action of the second spring 2007, the bend 2006 resets and takes the pressure block 2008 through the opening 2009. Then the pressure block 2008 presses the first pressing switch 2002. The limit block 2003 limits the descent of the pressure block 2008 to prevent it from damaging the first pressing switch 2002. The pressed first pressing switch 2002 connects the circuit, which powers on the alarm 2004 and triggers an alarm, thereby reminding the worker to change the cutting tool.

[0051] The above operation not only displays the number of turning operations, but also reminds workers to change the cutting tool after the specified number is reached, achieving two goals at once.

[0052] As one embodiment of this invention, the anti-interference structure includes grooves 301 distributed on the surface of the chuck 3, a sliding groove 302 at the bottom of the grooves 301, a first magnet 303 slidably connected along the sliding groove 302 in the grooves 301, a third spring 304 connected to the first magnet 303 in the sliding groove 302, a mounting plate 305 fixed on the spindle box 2, a sliding rod 306 slidably connected on the mounting plate 305, a second magnet 307 fixed at the end of the sliding rod 306, a fourth spring 308 provided on the outside of the sliding rod 306, and a second push switch 309 mounted on the mounting plate 305.

[0053] The bottom of the stop bar 201 is provided with a second vertical groove 310, and a vertical rod 311 is slidably connected along the second vertical groove 310. A protrusion 312 is fixed on the vertical rod 311. A horizontal plate 313 is fixed at the bottom of the stop bar 201. A sliding plate 320 is slidably connected to the horizontal plate 313 through a horizontal groove 314. A fifth spring 315 is connected to the sliding plate 320 in the horizontal groove 314. An iron block 316 is fixed at one end of the sliding plate 320. An electromagnet 317 is installed on the horizontal plate 313. The electromagnet 317 is electrically connected to the second push switch 309. The sliding plate 320 is provided with a connecting flat groove 318 and a sloping groove 319. The protrusion 312 is located in the flat groove 318.

[0054] It should be noted that after the upper pressure plate is clamped onto the chuck 3, the bottom of the vertical rod 311 is in contact with the upper pressure plate. If the chuck 3 rotates in this manner, the friction between the vertical rod 311 and the upper pressure plate will interfere with and affect the normal turning process. The anti-interference structure of the present invention is designed to solve this problem.

[0055] Specifically, such as Figure 5 As shown, the rotation of chuck 3 generates centrifugal force, which causes magnet 303 to overcome the resistance of spring 304 and move along the slide 302 to the outside of groove 301. Then, the distance between magnet 303 and magnet 307 is shortened. When the distance is shortened, magnet 307 and slide bar 306 will move on mounting plate 305 under the repulsion of like poles. Then, magnet 307 moves and presses the second push switch 309 to energize electromagnet 317. As long as chuck 3 rotates, centrifugal force will always exist, so electromagnet 317 will remain energized.

[0056] When the electromagnet 317 is energized, it generates magnetism and attracts the iron block 316, which overcomes the resistance of the fifth spring 315 and moves along the transverse groove 314. This forces the slide plate 320 to move toward the side of the electromagnet 317. Then, the inclined groove 319 reaches the protrusion 312. The movement of the inclined groove 319 drives the vertical rod 311 to move upward along the second vertical groove 310, so that the bottom of the vertical rod 311 no longer contacts the pressure plate. This way, no friction is generated, thus ensuring the normal rotation of the chuck 3.

[0057] After the turning is completed, the chuck 3 stops rotating and the centrifugal force disappears. Then, spring 308 returns to its original position, so magnet 307 no longer presses against push switch 309. Then, electromagnet 317 is de-energized and returns to its original position under the action of spring 315. Figure 4 The initial state, and then wait for the next clamping of the pressure plate.

[0058] It should be noted that when the chuck 3 starts to rotate, the centrifugal force is small. At this time, the bottom of the vertical rod 311 will definitely have a brief contact with the upper pressure plate. In order to solve this minor defect, the present invention embeds a roller at the bottom of the vertical rod 311, which changes the sliding friction into rolling friction and greatly reduces the friction force, thereby dealing with the brief contact between the vertical rod 311 and the upper pressure plate when the chuck 3 rotates.

[0059] Additionally, a damping layer is embedded at the connection point between the slide bar 306 and the mounting plate 305. This damping layer includes, but is not limited to, rubber and silicone. Its purpose is to delay the reset of the slide bar 306, the second magnet 307, and the second push switch 309. Since the three first magnets 303 are spaced apart, when the first magnet 303 and the second magnet 307 are briefly separated, the damping layer can compensate for this separation time, preventing the second push switch 309 from resetting and cutting off power when the first magnet 303 and the second magnet 307 are briefly separated.

[0060] The aforementioned anti-interference structure eliminates frictional interference between the vertical rod 311 and the upper pressure plate, preventing abnormal vibration from causing abnormal accelerated wear of the cutting tool. This prevents the cutting tool from reaching its dullness limit prematurely and failing before the coding band 215 displays "200", ensuring accurate correspondence between the tool changing action and the digital display.

[0061] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lathe for machining a floating upper pressure plate for clamping the end face of cylindrical gears, comprising: Lathe (1), spindle box (2), chuck (3), wherein the chuck (3) is used to clamp the upper pressure plate and drive the upper pressure plate to rotate to realize turning; The feature is that a display structure is installed on one side of the chuck (3) on the spindle box (2). The display structure is used to display the real-time turning quantity of the upper pressure plate. The display structure is triggered by the action of clamping the upper pressure plate by the chuck (3). The display structure includes a quantitative reminder component. The quantitative reminder component is used to remind the operator to change the cutting tool when the upper pressure plate reaches the specified turning quantity. The display structure includes a stop bar (201), and the bottom of the stop bar (201) is provided with an anti-interference structure. The anti-interference structure is achieved by the centrifugal force generated when the chuck (3) rotates. The anti-interference structure is used to eliminate the frictional interference between the stop bar (201) and the upper pressure plate to ensure the normal rotation of the chuck (3).

2. The lathe for machining a floating upper pressure plate for clamping the end face of a cylindrical gear according to claim 1, characterized in that, The display structure also includes a first vertical groove (202) provided on the spindle box (2), the stop rod (201) is slidably connected in the first vertical groove (202), the first vertical groove (202) is connected to the stop rod (201) by a return spring (217), one end of the stop rod (201) is fixed with a rack (203), the spindle box (2) is rotatably connected with a gear (204) by a damping shaft, the gear (204) is fixed with a first disk (205), and wedge blocks (206) are distributed circumferentially on the first disk (205).

3. A lathe for machining a floating upper pressure plate for clamping the end face of a cylindrical gear according to claim 2, characterized in that, Two support plates (207) are fixed on the main spindle box (2). A take-up shaft (208) and a release shaft (209) are respectively rotated on the two support plates (207). A square rod (210) is slidably connected inside the take-up shaft (208). The take-up shaft (208) is connected to the square rod (210) through a first spring (211). A second disc (212) is fixed at one end of the square rod (210). Wedge-shaped grooves (213) are distributed around the second disc (212).

4. A lathe for machining a floating upper pressure plate for clamping the end face of a cylindrical gear according to claim 3, characterized in that, A reel (214) is inserted into the outside of the release shaft (209). The outside of the reel (214) is a rolled coding tape (215). Two limiting rods (216) are fixed on the main shaft box (2). One end of the coding tape (215) passes through the two limiting rods (216) and is wound around the take-up shaft (208).

5. A lathe for machining a floating upper pressure plate for clamping the end face of a cylindrical gear according to claim 1, characterized in that, The quantitative reminder component includes a pad (2001) fixed to the bottom of two limit rods (216). A first push switch (2002) and a limit block (2003) are installed on the top surface of the pad (2001). An alarm (2004) is installed on the bottom surface of the pad (2001). The first push switch (2002) and the alarm (2004) are electrically connected.

6. A lathe for machining a floating upper pressure plate for clamping the end face of a cylindrical gear according to claim 5, characterized in that, A hollow cylinder (2005) is fixed to the top surface of one of the limiting rods (216). A bent tube (2006) is slidably connected inside the hollow cylinder (2005). The hollow cylinder (2005) is connected to the bent tube (2006) by a second spring (2007). A pressure block (2008) is fixed to one end of the bent tube (2006). The pressure block (2008) is in contact with the surface of the coding tape (215).

7. A lathe for machining a floating upper pressure plate for clamping the end face of a cylindrical gear according to claim 6, characterized in that, An opening (2009) is provided on the coding strip (215), and the pressure block (2008) cooperates with the opening (2009) to realize the reminder.

8. A lathe for machining a floating upper pressure plate for clamping the end face of a cylindrical gear according to claim 1, characterized in that, The anti-interference structure includes grooves (301) distributed on the surface of the chuck (3), a sliding groove (302) provided at the bottom of the groove (301), a first magnet (303) slidably connected in the groove (301) along the sliding groove (302), the first magnet (303) being connected in the sliding groove (302) by a third spring (304), a mounting plate (305) fixed on the spindle box (2), a sliding rod (306) slidably connected on the mounting plate (305), a second magnet (307) fixed at the end of the sliding rod (306), a fourth spring (308) provided on the outside of the sliding rod (306), and a second push switch (309) installed on the mounting plate (305).

9. A lathe for machining a floating upper pressure plate for clamping the end face of a cylindrical gear according to claim 8, characterized in that, The bottom of the stop bar (201) is provided with a second vertical groove (310), and a vertical rod (311) is slidably connected along the second vertical groove (310). A protrusion (312) is fixed on the vertical rod (311).

10. A lathe for machining a floating upper pressure plate for clamping the end face of a cylindrical gear according to claim 9, characterized in that, The bottom end of the stop bar (201) is fixed with a horizontal plate (313). A sliding plate (320) is slidably connected to the horizontal plate (313) through a horizontal groove (314). The horizontal groove (314) is connected to the sliding plate (320) through a No. 5 spring (315). An iron block (316) is fixed to one end of the sliding plate (320). An electromagnet (317) is installed on the horizontal plate (313). The electromagnet (317) is electrically connected to the No. 2 push switch (309). The sliding plate (320) is provided with a communicating flat groove (318) and a sloping groove (319). The protrusion (312) is located in the flat groove (318).

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