Polishing device for mold core
The design of the automatic polishing device solves the problems of low precision and efficiency in traditional manual polishing methods, and realizes high-precision automated polishing and dust collection of mold cores, thus protecting the health of workers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-14
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional manual polishing methods are difficult to control precisely in terms of pressure and trajectory, resulting in low geometric accuracy of the mold core, low efficiency, and dust pollution that harms health and safety.
Design an automatic polishing device that employs horizontal, vertical, and forward/backward drive mechanisms, combined with a clamping mechanism and a dust collection system, to achieve automated polishing and dust collection of mold cores.
It improved the polishing quality and precision of mold cores, reduced dust pollution, protected workers' health, and increased work efficiency.
Smart Images
Figure CN224088676U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mold manufacturing and processing technology, and specifically relates to a polishing device for mold cores. Background Technology
[0002] As the manufacturing industry places increasing demands on product appearance quality, the surface finish and geometric accuracy of mold cores have become key indicators. However, traditional manual polishing methods have significant drawbacks: First, they rely on worker experience, making it difficult to precisely and consistently control pressure and trajectory during polishing, easily leading to defects such as wavy lines and grooves, affecting the geometric accuracy of the mold core. Second, manual polishing is inefficient, labor-intensive, and cannot meet the high consistency requirements of complex curved surface molds. Furthermore, long-term exposure to metal dust generated during polishing can cause occupational health risks such as respiratory diseases and pneumoconiosis, while dust accumulation can lead to equipment wear or even explosions, creating safety hazards.
[0003] Therefore, the above problems urgently need to be solved. Utility Model Content
[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a polishing device for mold cores, which automatically polishes the mold cores, collects the dust generated during the polishing process, reduces dust pollution, and protects the health of workers.
[0005] Technical Solution: To achieve the above objectives, this utility model provides a polishing device for mold cores, including a worktable. A fixing device and a polishing mechanism are connected to the top surface of the worktable. The fixing device includes a limiting block and a clamping mechanism, which presses and fixes the mold core to the limiting block. The polishing mechanism includes a support, and a horizontal drive mechanism is connected to the top surface of the support. The horizontal drive mechanism drives a vertical drive mechanism, which in turn drives the vertical drive mechanism to reciprocate horizontally. The vertical drive mechanism drives a grinding mechanism, which in turn drives the grinding mechanism to reciprocate vertically. The fixing device is connected to the top surface of the worktable via a front and rear drive mechanism. This utility model is used for polishing mold cores, reducing surface roughness and improving smoothness. For polishing the mold core, this utility model requires programming a computer based on a 3D model of the mold core to set a grinding path. The horizontal and vertical drive mechanisms reciprocate on the surface of the mold core according to the programmed grinding path, while the front and rear drive mechanisms drive the mold core to move back and forth, achieving automatic grinding of the mold core surface. Furthermore, this utility model is equipped with a fixing device, which presses and fixes the mold core through the clamping mechanism to prevent the mold core from moving during the polishing process, thereby improving the polishing quality and the mold precision.
[0006] Furthermore, in the aforementioned polishing device for mold cores, the transverse drive mechanism includes a crossbeam, which is elongated and horizontally connected to the upper end of a support. A transverse slide rail and a rack are connected to the side of the crossbeam, both horizontally positioned. A slide plate is slidably connected to the transverse slide rail via a slider. The slide plate slides along the transverse slide rail. A first gearbox is connected to the side of the slide plate away from the transverse slide rail. A horizontal drive motor is connected to the input end of the first gearbox. The output shaft of the first gearbox passes through the slide plate and is connected to a gear, which meshes with the rack. The vertical drive mechanism is connected to the side of the slide plate away from the transverse slide rail. The horizontal drive motor is a servo motor. The horizontal drive motor drives the slide plate to slide along the slide rail via the gear and rack, thereby driving the vertical drive mechanism to move horizontally. The servo motor can precisely control the number of rotations and the rotation speed, thus achieving precise control of the vertical drive mechanism and ensuring precise polishing of the mold core surface.
[0007] Furthermore, in the aforementioned polishing device for mold cores, the vertical drive mechanism includes a vertical plate. A vertical slide rail is provided on the side of the vertical plate near the slide plate, and the vertical slide rail is vertically positioned. A slider is provided on the side of the slide plate near the vertical plate, and the slider is slidably connected to the vertical slide rail. A drive belt is connected to one side of the vertical plate, and the drive belt is connected to both ends of the vertical plate. A second gearbox is connected to the side of the slide plate away from the vertical plate. A vertical drive motor is connected to the input end of the second gearbox. The output shaft of the second gearbox passes through the slide plate and is connected to a pulley. The output shaft of the second gearbox is driven by the drive belt. The drive belt is a synchronous belt, and a tension pulley is provided on the slide plate. The drive belt is wound around the tension pulley to ensure the tension of the drive belt. The vertical drive motor is a servo motor. During the grinding and polishing process, if the grinding mechanism is subjected to excessive force, the drive belt provides a clearance for the vertical plate to move, or even slip, to avoid excessive force causing wear to the mold core.
[0008] Furthermore, in the aforementioned polishing device for mold cores, the polishing mechanism includes a first horizontal frame connected to the lower end of the vertical plate. The first horizontal frame comprises two or more parallel profiles. A polishing motor is connected to the upper side of the first horizontal frame, and a third gearbox is connected between the first horizontal frames. The input ends of the polishing motor and the third gearbox are driven together, and the output end of the third gearbox is connected to a telescopic shaft. A polishing head is connected to the lower end of the telescopic shaft. The polishing motor drives the telescopic shaft to rotate through the third gearbox, and the telescopic shaft drives the polishing head to polish the mold core. The polishing head is a polishing wheel. The upper end of the telescopic shaft is connected to the output end of the third gearbox. The telescopic shaft is telescopic. During the polishing process, the polishing head moves with the surface of the mold core, thereby pushing the telescopic shaft to extend and retract, so that the polishing head fits the surface of the mold core, improving the polishing effect.
[0009] Furthermore, in the aforementioned polishing device for the mold core, the telescopic shaft and the third gearbox are slidably connected. An upper retaining ring is connected to the upper end of the telescopic shaft, and a lower retaining ring is connected to the lower end. An upper spring is fitted onto the upper end of the telescopic shaft, with its upper and lower ends respectively abutting against the upper retaining ring and the third gearbox. A lower spring is fitted onto the upper end of the telescopic shaft, with its upper and lower ends respectively abutting against the third gearbox and the lower retaining ring. When not polishing, the upper spring supports the upper retaining ring, keeping the telescopic shaft in position. During polishing, the polishing head abuts against the surface of the mold core, compressing the upper spring. When the polishing head polishes a protruding portion of the mold core surface, it further compresses the upper spring. When it polishes a concave portion of the mold core surface, it releases the upper spring and compresses the lower spring, ensuring the polishing head remains in contact with the mold core surface, thus guaranteeing polishing quality.
[0010] Furthermore, in the aforementioned polishing device for mold cores, dust collection connectors are connected to both ends of the first crossbeam, and these connectors are connected to the grooves within the first crossbeam via connectors. The dust collection connectors are connected to the dust collection pipes, allowing them to collect metal dust generated during polishing, preventing dust from scattering, protecting worker health, and maintaining a good working environment.
[0011] Furthermore, in the aforementioned polishing device for mold cores, a second crossbeam is connected to the upper end of the first crossbeam. The second crossbeam consists of two or more parallel profiles arranged in a cross configuration. Dust collection connectors are connected to both ends of the second crossbeam, and these connectors are connected to grooves within the second crossbeam via connectors. The second crossbeam is configured so that the dust collection connectors surround the polishing head, improving dust collection efficiency.
[0012] Furthermore, in the aforementioned polishing device for the mold core, a rubber sleeve is connected to the lower end of the dust suction connector. The rubber sleeve allows the dust suction port to be closer to the surface of the mold core, improving the dust collection effect. At the same time, the rubber sleeve itself is relatively soft, preventing damage to the surface of the mold core when the rubber sleeve collides with the raised parts of the mold core surface.
[0013] Furthermore, in the aforementioned polishing device for the mold core, the clamping mechanism includes a base plate connected to the top surface of the worktable. A support block and a sliding block are connected to the top surface of the base plate, arranged parallel to each other. A push rod is connected to the support block, passing through both the support block and the sliding block. The push rod and support block are threadedly connected, and the push rod and sliding block are slidably connected. A push plate is hinged to the end of the push rod near the limiting block, and a handwheel is connected to the end of the push rod away from the push plate. When it is necessary to clamp the mold core against the limiting block, the handwheel is rotated, and the push rod extends towards the limiting block, pushing the push plate and clamping the mold core between the push plate and the limiting block. A T-shaped external thread is provided on the outer circumference of the push rod, and the support block has a threaded hole corresponding to the T-shaped external thread. The external thread of the push rod provides a T-shaped external thread, giving the push rod a self-locking function to prevent the mold core from loosening.
[0014] Furthermore, in the aforementioned polishing device for mold cores, two or more limiting blocks are provided, and the clamping mechanism is correspondingly arranged with the limiting blocks. Multiple clamping mechanisms are provided to adapt to mold cores of different sizes, improving the adaptability of the device.
[0015] Furthermore, in the aforementioned polishing device for mold cores, the front and rear drive mechanism includes a moving platform. A guide post is connected to the top surface of the worktable, and the guide post is positioned perpendicular to the driving direction of the transverse drive mechanism. The moving platform is slidably connected to the guide post via a slider. A lead screw is connected to the top surface of the worktable, and the lead screw is movably connected to the top surface of the worktable via a bearing seat shaft. One end of the lead screw is driven and connected to a front and rear drive motor, and the lead screw is driven and connected to the moving platform via a bushing. The front and rear drive motors are servo motors. During the grinding and polishing process, the mold core is mounted on the surface of the moving platform. The front and rear drive motors drive the lead screw to rotate, and the lead screw drives the moving platform, forming a linkage with the transverse drive mechanism and the vertical drive mechanism to grind the surface D of the mold core, achieving automated grinding and polishing and improving work efficiency.
[0016] As can be seen from the above technical solution, this utility model has the following beneficial effects: The polishing device for mold cores of this utility model automatically operates the horizontal drive mechanism, vertical drive mechanism, and front-to-back drive mechanism according to the polishing program, realizing automatic polishing of the mold core surface. A fixing device is provided to press and fix the mold core through the clamping mechanism, preventing the mold core from moving during polishing, improving polishing quality and mold precision. A telescopic shaft is provided to ensure that the polishing head always contacts and polishes the mold core surface, ensuring polishing quality. A dust collection connector collects the metal dust generated during polishing, preventing metal dust from scattering, protecting worker health, and maintaining a good working environment. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the polishing device for mold cores according to the present invention;
[0018] Figure 2 for Figure 1 A magnified view of a portion of the image;
[0019] Figure 3 for Figure 2 A magnified view of a portion of the image;
[0020] Figure 4 This is a side view of the polishing mechanism;
[0021] Figure 5 This is a schematic diagram of the clamping mechanism.
[0022] Figure 6 This is a schematic diagram of the front and rear drive mechanisms.
[0023] In the diagram: 1. Workbench; 2. Fixing device; 21. Limiting block; 22. Clamping mechanism; 221. Base plate; 222. Support block; 223. Sliding block; 224. Push rod; 225. Push plate; 226. Handwheel; 3. Polishing mechanism. 31. Bracket; 32. Lateral drive mechanism; 321. Crossbeam; 322. Lateral slide rail; 323. Rack; 324. Slide plate; 325. First gearbox; 326. Horizontal drive motor; 33. Vertical drive mechanism; 331. Vertical plate; 327. Slider; 332. Drive belt; 333. Second gearbox; 334. Vertical drive motor; 34. Grinding mechanism; 341. First crossbeam; 342. Grinding motor; 343. Third gearbox; 344. Telescopic shaft; 3441. Upper retaining ring; 3442. Lower retaining ring; 3443. Upper spring; 3444. Lower spring; 345. Polishing head; 346. Second crossbeam; 347. Dust suction connector; 3471. Rubber sleeve; 4. Front and rear drive mechanism; 41. Moving platform; 42. Lead screw; 43. Front and rear drive motor. Detailed Implementation
[0024] Example 1
[0025] like Figure 1 The illustrated polishing device for mold cores includes a worktable 1, with a fixing device 2 and a polishing mechanism 3 connected to the top surface of the worktable 1. The fixing device 2 includes a limiting block 21 and a clamping mechanism 22, which presses and fixes the mold core to the limiting block 21. The polishing mechanism 3 includes a bracket 31, with a horizontal drive mechanism 32 connected to the top surface of the bracket 31. The horizontal drive mechanism 32 drives a vertical drive mechanism 33, which reciprocates horizontally. The vertical drive mechanism 33 drives a grinding mechanism 34, which reciprocates vertically. The fixing device 2 is connected to the top surface of the worktable 1 via front and rear drive mechanisms 4.
[0026] like Figure 2-3The polishing device for mold cores shown includes a horizontal drive mechanism 32 comprising a crossbeam 321, which is elongated and horizontally connected to the upper end of a support 31. A horizontal slide rail 322 and a rack 323 are connected to the side of the crossbeam 321. The horizontal slide rail 322 and rack 323 are horizontally arranged. A slide plate 324 is slidably connected to the horizontal slide rail 322 via a slider. The slide plate 324 slides along the horizontal slide rail 322. A first gearbox 325 is connected to the side of the slide plate 324 away from the horizontal slide rail 322. A horizontal drive motor 326 is connected to the input end of the first gearbox 325. The output shaft of the first gearbox 325 passes through the slide plate 324 and is connected to a gear. The gear meshes with the rack 323. A vertical drive mechanism 33 is connected to the side of the slide plate 324 away from the horizontal slide rail 322. The horizontal drive motor 326 is a servo motor.
[0027] The horizontal drive motor 326 drives the slide plate 324 to slide along the slide rail 322 through the gear and rack 323, thereby driving the vertical drive mechanism 33 to move horizontally. The servo motor can precisely control the number of rotations and the rotation speed, thereby achieving precise control of the vertical drive mechanism 33 and ensuring precise grinding of the mold core surface.
[0028] In this embodiment, the vertical drive mechanism 33 includes a vertical plate 331. A vertical slide rail is provided on the side of the vertical plate 331 near the slide plate 324. The vertical slide rail is vertically arranged. A slider 327 is provided on the side of the slide plate 324 near the vertical plate 331. The slider 327 is slidably connected to the vertical slide rail. A drive belt 332 is connected to one side of the vertical plate 331, and the drive belt 332 is connected to both ends of the vertical plate 331. A second gearbox 333 is connected to the side of the slide plate 324 away from the vertical plate 331. A vertical drive motor 334 is connected to the input end of the second gearbox 333. The output shaft of the second gearbox 333 passes through the slide plate 324 and is connected to a pulley. The output shaft of the second gearbox 333 is drivenly connected to the drive belt 332. The drive belt 332 is a synchronous belt. A tension pulley is provided on the slide plate 324, and the drive belt 332 is wound around the tension pulley to ensure the tension of the drive belt 332. The vertical drive motor 334 is a servo motor.
[0029] like Figure 4The polishing device for mold cores shown includes a polishing mechanism 34 comprising a first horizontal frame 341 connected to the lower end of a vertical plate 331. The first horizontal frame 341 comprises two or more parallel profiles. A polishing motor 342 is connected to the upper side of the first horizontal frame 341, and a third gearbox 343 is connected between the first horizontal frames 341. The input ends of the polishing motor 342 and the third gearbox 343 are driven together, and the output end of the third gearbox 343 is connected to a telescopic shaft 344. A polishing head 345 is connected to the lower end of the telescopic shaft 344. The third gearbox 343 and the telescopic shaft 34 are splined together. The polishing motor 342 drives the telescopic shaft 344 to rotate via the third gearbox 343, and the telescopic shaft 344 drives the polishing head 345 to polish the mold core. The polishing head 345 is a polishing wheel.
[0030] In this embodiment, the telescopic shaft 344 and the third gearbox 343 are slidably connected, preferably by a spline connection. An upper retaining ring 3441 is connected to the upper end of the telescopic shaft 344, and a lower retaining ring 3442 is connected to the lower end. An upper spring 3443 is fitted onto the upper end of the telescopic shaft 344, with its upper and lower ends abutting against the upper retaining ring 3441 and the third gearbox 343, respectively. A lower spring 3444 is fitted onto the upper end of the telescopic shaft 344, with its upper and lower ends abutting against the third gearbox 343 and the lower retaining ring 3442, respectively. When not being polished, the upper spring 3443 supports the upper retaining ring 3441, keeping the telescopic shaft 344 in its position.
[0031] In this embodiment, dust suction connectors 347 are connected to both ends of the first crossbeam 341, and the dust suction connectors 347 are connected to the grooves of the first crossbeam 341 via connectors. The dust suction connectors 347 are connected to the dust suction pipe. During the polishing process, the dust suction connectors 347 collect the metal dust generated during polishing.
[0032] In this embodiment, a second crossbeam 346 is connected to the upper end of the first crossbeam 341. The second crossbeam 346 consists of two or more parallel profiles arranged in a cross configuration with the first crossbeam 341. Dust collection connectors 347 are connected to both ends of the second crossbeam 346, and these connectors are attached to grooves within the second crossbeam 346 via connectors. The second crossbeam 346 is configured such that the dust collection connectors 347 surround the polishing head 345, improving dust collection efficiency.
[0033] In this embodiment, a rubber sleeve 3471 is connected to the lower end of the vacuum nozzle 347.
[0034] The rubber sleeve 3471 is designed to bring the dust suction port closer to the mold core surface, improving the dust collection effect. At the same time, the rubber sleeve 3471 is relatively soft, so when the rubber sleeve 3471 collides with the raised part of the mold core surface, it will prevent damage to the mold core surface.
[0035] like Figure 5The polishing device for mold cores shown includes a clamping mechanism 22 comprising a base plate 221 connected to the top surface of the worktable 1. A support block 222 and a sliding block 223 are connected to the top surface of the base plate 221. The support block 222 and the sliding block 223 are arranged in parallel. A push rod 224 is connected to the support block 222. The push rod 224 passes through the support block 222 and the sliding block 223. The push rod 224 is threadedly connected to the support block 222 and slidably connected to the sliding block 223. The end of the push rod 224 near the limiting block 21 is hinged to a push plate 225, and the end of the push rod 224 away from the push plate 225 is connected to a handwheel 226.
[0036] In this embodiment, there are two or more limiting blocks 21, and the pressing mechanism 22 and the limiting blocks 21 are correspondingly arranged.
[0037] like Figure 6 The polishing device for mold cores shown includes a front and rear drive mechanism 4 comprising a moving platform 41. A guide post is connected to the top surface of the worktable 1, and the guide post is arranged perpendicular to the driving direction of the transverse drive mechanism 32. The moving platform 41 is slidably connected to the guide post via a slider. A lead screw 42 is connected to the top surface of the worktable 1, and the lead screw 42 is movably connected to the top surface of the worktable 1 via a bearing seat shaft. One end of the lead screw 42 is driven and connected to a front and rear drive motor 43, and the lead screw 42 is driven and connected to the moving platform 41 via a bushing. The front and rear drive motor 43 is a servo motor.
[0038] This invention requires that the polishing of the mold core be first programmed via computer based on the 3D model of the mold core, setting the polishing path. Then, the mold core is placed on the surface of the moving platform 4. Rotating the handwheel 226 extends the push rod 224 towards the limiting block 21, pushing the push plate 225 and pressing the mold core between the push plate 225 and the limiting block 21. The limiting block 21 provides a positioning reference for the mold core. Next, the polishing head 345 is used to center the mold core, setting its horizontal center and highest point. The polishing head 345 abuts against the surface of the mold core, compressing the upper spring 3443. Then, the horizontal drive mechanism 32 and the vertical drive mechanism 33 drive the polishing head 345 to reciprocate on the surface of the mold core according to the polishing program. The front-rear drive mechanism 4 drives the mold core to move back and forth, achieving automatic polishing of the mold core surface. During the polishing process, the polishing head 345 polishes the raised parts of the mold core surface, compressing the upper spring 3443. When polishing the concave parts of the mold core surface, the upper spring 3443 is released, and the lower spring 3444 is compressed, ensuring that the polishing head 345 remains in contact with the mold core surface. Simultaneously, the dust removal device is activated, collecting the generated metal dust through the suction connector 347. Once the polishing process is complete, the handwheel 226 is rotated in the opposite direction, causing the push rod 224 to retract the push plate 225, removing the mold core and ending the polishing process.
[0039] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.
Claims
1. A polishing device for mold cores, characterized in that: The device includes a worktable (1), on the top surface of which a fixing device (2) and a polishing mechanism (3) are connected; the fixing device (2) includes a limiting block (21) and a pressing mechanism (22), the pressing mechanism (22) pressing and fixing the mold core to the limiting block (21); the polishing mechanism (3) includes a bracket (31), on the top surface of which a horizontal driving mechanism (32) is connected, the horizontal driving mechanism (32) drives a vertical driving mechanism (33), the horizontal driving mechanism (32) drives the vertical driving mechanism (33) to reciprocate in the horizontal direction, the vertical driving mechanism (33) drives a grinding mechanism (34), the vertical driving mechanism (33) drives the grinding mechanism (34) to reciprocate in the vertical direction; the fixing device (2) is connected to the top surface of the worktable (1) through a front and rear driving mechanism (4).
2. The polishing apparatus for mold cores according to claim 1, characterized in that: The transverse drive mechanism (32) includes a crossbeam (321), which is elongated and horizontally connected to the upper end of the bracket (31). A transverse slide rail (322) and a rack (323) are connected to the side of the crossbeam (321). The transverse slide rail (322) and the rack (323) are horizontally arranged respectively. A slide plate (324) is slidably connected to the transverse slide rail (322) via a slider. The slide plate (324) slides along the transverse slide rail (322). The slide plate (324) is connected to a first gearbox (325) on the side away from the transverse slide rail (322). The input end of the first gearbox (325) is connected to a horizontal drive motor (326). The output shaft of the first gearbox (325) passes through the slide plate (324) and is connected to a gear. The gear and the rack (323) are meshed together. The vertical drive mechanism (33) is connected to the side of the slide plate (324) away from the transverse slide rail (322).
3. The polishing apparatus for mold cores according to claim 2, characterized in that: The vertical drive mechanism (33) includes a vertical plate (331), a vertical slide rail is provided on the side of the vertical plate (331) near the slide plate (324), the vertical slide rail is vertically arranged, a slider (327) is provided on the side of the slide plate (324) near the vertical plate (331), the slider (327) is slidably connected to the vertical slide rail; a drive belt (332) is connected to one side of the vertical plate (331), the drive belt (332) is connected to both ends of the vertical plate (331); a second gearbox (333) is connected to the side of the slide plate (324) away from the vertical plate (331), a vertical drive motor (334) is connected to the input end of the second gearbox (333), the output shaft of the second gearbox (333) passes through the slide plate (324), a pulley is connected to the output shaft of the second gearbox (333), and the output shaft of the second gearbox (333) is drivenly connected to the drive belt (332).
4. The polishing apparatus for mold cores according to claim 3, characterized in that: The polishing mechanism (34) includes a first crossbeam (341) connected to the lower end of the vertical plate (331). The first crossbeam (341) includes two or more profiles arranged in parallel. A polishing motor (342) is connected to the upper side of the first crossbeam (341). A third gearbox (343) is connected between the first crossbeams (341). The input ends of the polishing motor (342) and the third gearbox (343) are driven to connect. A telescopic shaft (344) is connected to the output end of the third gearbox (343). A polishing head (345) is connected to the lower end of the telescopic shaft (344).
5. The polishing apparatus for mold cores according to claim 4, characterized in that: The telescopic shaft (344) and the third gearbox (343) are slidably connected. An upper retaining ring (3441) is connected to the upper end of the telescopic shaft (344), and a lower retaining ring (3442) is connected to the lower end of the telescopic shaft (344). An upper spring (3443) is sleeved on the upper end of the telescopic shaft (344), and the upper and lower ends of the upper spring (3443) abut against the upper retaining ring (3441) and the third gearbox (343) respectively. A lower spring (3444) is sleeved on the upper end of the telescopic shaft (344), and the upper and lower ends of the lower spring (3444) abut against the third gearbox (343) and the lower retaining ring (3442) respectively.
6. The polishing apparatus for mold cores according to claim 4, characterized in that: The first crossbar (341) is connected to a vacuum cleaner connector (347) at both ends. The vacuum cleaner connector (347) is connected to the groove of the first crossbar (341) through a connector.
7. The polishing apparatus for mold cores according to claim 6, characterized in that: The upper end of the first crossbeam (341) is connected to a second crossbeam (346). The second crossbeam (346) consists of two or more profiles arranged in parallel. The second crossbeam (346) and the first crossbeam (341) are arranged in a cross configuration. Both ends of the second crossbeam (346) are connected to a vacuum cleaner connector (347). The vacuum cleaner connector (347) is connected to the groove provided in the second crossbeam (346) through a connector.
8. The polishing apparatus for mold cores according to claim 7, characterized in that: The lower end of the vacuum nozzle (347) is connected to a rubber sleeve (3471).
9. The polishing apparatus for mold cores according to claim 1, characterized in that: The clamping mechanism (22) includes a base plate (221) connected to the top surface of the workbench (1). A support block (222) and a sliding block (223) are connected to the top surface of the base plate (221). The support block (222) and the sliding block (223) are arranged in parallel. A push rod (224) is connected to the support block (222). The push rod (224) passes through the support block (222) and the sliding block (223). The push rod (224) and the support block (222) are threaded together. The push rod (224) and the sliding block (223) are slidably connected. The end of the push rod (224) near the limit block (21) is hinged to a push plate (225). The end of the push rod (224) away from the push plate (225) is connected to a handwheel (226).
10. The polishing apparatus for mold cores according to claim 9, characterized in that: The front and rear drive mechanism (4) includes a moving platform (41). The top surface of the worktable (1) is connected to a guide column. The guide column is set perpendicular to the driving direction of the transverse drive mechanism (32). The moving platform (41) is slidably connected to the guide column by a slider. The top surface of the worktable (1) is connected to a lead screw (42). The lead screw (42) is movably connected to the top surface of the worktable (1) through a bearing seat shaft. One end of the lead screw (42) is driven and connected to a front and rear drive motor (43). The lead screw (42) is driven and connected to the moving platform (41) through a bushing.