Positioning mechanism of surface grinding machine

Abstract

The utility model relates to the technical field of positioning mechanisms, and discloses a surface grinding machine positioning mechanism which comprises a hollow chuck and a rotating disc, the rotating disc is assembled in the hollow chuck, an inner cavity of the rotating disc is evenly connected with connecting rods through hinges, and the other ends of the connecting rods are connected with rubber pressing plates through hinges. A guide telescopic rod is connected between the rubber pressing plate and the hollow chuck, the connecting rod is sleeved with a worm gear, and a self-locking driving mechanism is assembled in an inner cavity of the hollow chuck. According to the positioning mechanism of the surface grinding machine, the positioning precision is guaranteed, workpiece surface damage is avoided, and workpiece deviation caused by machining vibration is effectively prevented through the flexible contact characteristic of a rubber material. According to the self-locking driving mechanism, a mechanical clamping structure is additionally arranged on the basis of transmission self-locking through a double-locking mechanism of a worm and a locking chuck, the stability of the positioning state is improved, an operator only needs to control an air cylinder to act to complete switching of the locking state, the operation process is simplified, and the auxiliary time is shortened.

Description

Technical Field

[0001] This utility model relates to the field of positioning mechanism technology, specifically a positioning mechanism for a surface grinder. Background Technology

[0002] Surface grinders, as key equipment in the field of precision machining, are widely used for the surface grinding of metal and non-metal workpieces. Their positioning mechanism directly affects the machining accuracy and surface quality. Traditional surface grinder positioning devices mostly adopt hydraulic or rigid mechanical transmission structures, achieving fixation by directly contacting the workpiece surface with a rigid pressure plate. This structure has significant technical bottlenecks in the clamping process of complex workpieces.

[0003] Existing positioning devices typically employ gear and rack or cam mechanisms in their transmission components. During pressure transmission, mechanical backlash can easily lead to uneven stress distribution across the pressure plate, potentially causing deformation of thin-walled workpieces or indentations on soft materials due to localized overpressure. Furthermore, rigid contact methods lack vibration damping mechanisms. When grinding force fluctuates, slight displacements can occur between the workpiece and the pressure plate, directly affecting the flatness of the machined surface. Traditional self-locking structures often rely on the single-stage self-locking characteristic of worm gears, which poses a risk of unlocking under continuous vibration. Operators must manually switch the locking state and use multiple limit switches for status confirmation, resulting in a cumbersome clamping process and an excessively high proportion of auxiliary time. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a positioning mechanism for a surface grinder, which solves the technical problem that the rigid contact method lacks a vibration buffering mechanism, and when the grinding force fluctuates, a small displacement will occur between the workpiece and the pressure plate, directly affecting the flatness of the machined surface.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a positioning mechanism for a surface grinder, comprising: a hollow chuck and a rotating disk, the rotating disk being assembled inside the hollow chuck, the inner cavity of the rotating disk being uniformly connected to connecting rods via hinges, the other end of the connecting rods being connected to a rubber pressure plate via hinges, a guide telescopic rod being connected between the rubber pressure plate and the hollow chuck, a worm gear being sleeved on the outside of the connecting rods, a self-locking drive mechanism being assembled inside the hollow chuck, the self-locking drive mechanism comprising a worm and a frame, the worm meshing with the worm gear, a locking chuck being sleeved on the outside of the worm, the frame being connected to the hollow chuck, a cylinder being assembled on the inner side of the frame, a locking block being connected to the output end of the cylinder, and a reduction motor being connected to the outside of the worm.

[0006] Preferably, the hollow chuck is uniformly provided with fixing frames on its exterior, and bolt grooves are formed on the exterior of the fixing frames. The standardized bolt groove design allows for quick and easy installation by matching the fixing frames with the T-slots of the grinding machine's worktable. Its symmetrical distribution effectively disperses machining vibrations and improves the overall rigidity of the positioning mechanism. The countersunk design of the bolt grooves prevents interference between the bolt head and the workpiece.

[0007] Preferably, the hollow chuck has an inner cavity with a mounting groove that contacts the worm gear. The mounting groove is precision ground to form a high-precision fit clearance of less than 0.02mm with the worm gear, ensuring smooth worm gear rotation and reducing radial runout through surface contact design. Lubricating oil channels within the groove provide continuous lubrication, extending the service life of the transmission components.

[0008] Preferably, the worm gear is externally connected to a support seat, which is connected to the mounting groove via a mounted bearing. The support seat employs a double-row tapered roller bearing structure, capable of simultaneously bearing the axial thrust and radial load of the worm gear. Its preload adjustment function ensures that the worm gear shaft system maintains coaxiality within 0.01 mm. The sealed design of the mounted bearing effectively prevents grinding fluid intrusion and avoids grease emulsification failure.

[0009] Preferably, the geared motor is externally connected to a motor mount, which is connected to a hollow chuck. A reinforcing rib connects the motor mount and the hollow chuck. The motor mount is fixed to the hollow chuck with four-point bolts, and its built-in elastic damping pad absorbs the motor's operating pulse torque. The reinforcing rib adopts a triangular cross-section design, ensuring that the system's natural frequency avoids the excitation frequency of the grinding machine spindle, resulting in a measured reduction of vibration amplitude of over 60%.

[0010] Preferably, the locking chuck has a slot on its outside, the inside of the slot matches the outside of the chuck block, and the slot adopts a trapezoidal tooth structure to form a surface contact lock with the wedge-shaped surface of the chuck block, increasing the contact area by 3 times compared with the traditional V-groove design.

[0011] Compared with the prior art, the present invention provides a positioning mechanism for a surface grinder, which has the following advantages:

[0012] The positioning mechanism of this surface grinder employs a worm gear transmission structure to drive the connecting rod movement, enabling the rubber pressure plate to apply pressure evenly. This ensures positioning accuracy while preventing workpiece surface damage. The flexible contact characteristics of the rubber material effectively prevent workpiece displacement caused by processing vibrations. The self-locking drive mechanism utilizes a dual locking mechanism of the worm gear and locking chuck, adding a mechanical locking structure to the transmission self-locking system. This enhances the stability of the positioning state. The operator only needs to control the cylinder to switch the locking state, simplifying the operation process and shortening auxiliary time. Attached Figure Description

[0013] Figure 1 This is a front view of the present utility model;

[0014] Figure 2 This is a partial sectional view of the present invention;

[0015] Figure 3 This is an external schematic diagram of the self-locking drive mechanism of this utility model.

[0016] In the diagram: 1. Hollow chuck; 11. Fixed frame; 12. Assembly slot; 2. Rotating disc; 21. Connecting rod; 22. Guide telescopic rod; 23. Rubber pressure plate; 24. Worm gear; 3. Self-locking drive mechanism; 31. Worm; 32. Support base; 33. Locking chuck; 34. Locking block; 35. Cylinder; 36. Frame; 37. Gear motor; 38. Motor base; 39. Reinforcing rib. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] This utility model provides a technical solution, please refer to Figure 1 , Figure 2 and Figure 3 A positioning mechanism for a surface grinder includes: a hollow chuck 1 and a rotary disk 2. The rotary disk 2 is assembled inside the hollow chuck 1 and connected to the hollow chuck 1 via a bearing seat. Connecting rods 21 are evenly connected to the inner cavity of the rotary disk 2 via hinges. A rubber pressure plate 23 is connected to the other end of the connecting rods 21 via a hinge. A guide telescopic rod 22 connects the rubber pressure plate 23 and the hollow chuck 1. The guide telescopic rod 22 includes a hollow column, and a sliding arm is slidably connected inside the hollow column. The sliding arm is connected to the hollow column. The connecting rod 21 is connected to the rubber pressure plate 23 and the hollow chuck 1 respectively. The worm gear 24 is sleeved on the outside of the connecting rod 21. The hollow chuck 1 is equipped with a self-locking drive mechanism 3. The self-locking drive mechanism 3 includes a worm 31 and a frame 36. The worm 31 meshes with the worm gear 24. The locking chuck 33 is sleeved on the outside of the worm 31. The frame 36 is connected to the hollow chuck 1. The inner side of the frame 36 is equipped with a cylinder 35. The output end of the cylinder 35 is connected to a locking block 34. The worm 31 is connected to a geared motor 37.

[0019] When the geared motor 37 drives the worm gear 31 to rotate, the worm wheel 24 drives the connecting rod 21 to deflect, causing the rubber pressure plate 23 to move axially along the guide telescopic rod 22 to clamp the workpiece. The worm wheel 24 and worm gear 31 transmission have self-locking characteristics, which can prevent the clamping force from being weakened by vibration or external force. After the cylinder 35 pushes the chuck block 34 into the slot of the locking chuck 33, a mechanical double lock is formed to ensure that the workpiece position is absolutely fixed during the grinding process.

[0020] The hollow chuck 1 has uniformly arranged fixing frames 11 on its exterior. The fixing frames 11 have bolt grooves on their exterior. The fixing frames 11, through a standardized bolt groove design, can be quickly matched and installed with the T-slots of the grinding machine worktable. Its symmetrical distribution structure can effectively disperse machining vibration and improve the overall rigidity of the positioning mechanism. The countersunk design of the bolt grooves can prevent the bolt head from interfering with the workpiece.

[0021] The hollow chuck 1 has an inner cavity with a mounting groove 12, which contacts the worm gear 31. The mounting groove 12 is machined using a precision grinding process to form a high-precision fit clearance of less than 0.02mm with the worm gear 31, ensuring smooth rotation of the worm gear 31 and reducing radial runout through the surface contact design. The lubrication channels provided in the groove can achieve continuous lubrication and extend the service life of the transmission components.

[0022] The worm gear 31 is externally connected to a support seat 32, which is connected to the mounting groove 12 via a mounted bearing. The support seat 32 adopts a double-row tapered roller bearing structure, which can simultaneously withstand the axial thrust and radial load of the worm gear 31. Its preload adjustment function ensures that the worm gear 31 shaft system maintains coaxiality within 0.01mm. The sealing design of the mounted bearing effectively prevents grinding fluid intrusion and avoids grease emulsification failure.

[0023] The geared motor 37 is externally connected to a motor mount 38, which is connected to a hollow chuck 1. A reinforcing rib 39 connects the motor mount 38 and the hollow chuck 1. The motor mount 38 is fixed to the hollow chuck 1 with four-point bolts. Its built-in elastic damping pad can absorb the pulse torque of the motor operation. The reinforcing rib 39 adopts a triangular cross-section design, so that the system's natural frequency avoids the excitation frequency of the grinding machine spindle, and the measured vibration amplitude is reduced by more than 60%.

[0024] The locking chuck 33 has a slot on its outside. The inside of the slot fits with the outside of the chuck block 34. The slot adopts a trapezoidal tooth structure, which forms a surface contact lock with the wedge-shaped surface of the chuck block 34. The contact area is three times larger than that of the traditional V-groove design.

[0025] This solution first fixes the position of the hollow chuck 1. When the workpiece needs to be positioned and fixed, the workpiece is placed into the inner cavity of the hollow chuck 1. The reduction motor 37 is started to drive the worm gear 31 to rotate, which in turn drives the worm wheel 24 to rotate. The worm wheel 24 drives the connecting rod 21 to drive the rubber pressure plate 23 to move. The rubber pressure plate 23 positions and fixes the workpiece. At the same time, the cylinder 35 is started to drive the locking block 34 to insert into the locking chuck 33, thereby fixing the position of the worm gear 31.

[0026] 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 process, method, article, or apparatus.

[0027] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning mechanism for a surface grinder, comprising: A hollow chuck (1) and a rotating disk (2), wherein the rotating disk (2) is assembled inside the hollow chuck (1), characterized in that: the inner cavity of the rotating disk (2) is uniformly connected to a connecting rod (21) by a hinge, the other end of the connecting rod (21) is connected to a rubber pressure plate (23) by a hinge, a guide telescopic rod (22) is connected between the rubber pressure plate (23) and the hollow chuck (1), a worm gear (24) is sleeved on the outside of the connecting rod (21), and the inner cavity of the hollow chuck (1) is equipped with There is a self-locking drive mechanism (3), which includes a worm (31) and a frame (36). The worm (31) meshes with a worm wheel (24). A locking chuck (33) is sleeved on the outside of the worm (31). The frame (36) is connected to a hollow chuck (1). A cylinder (35) is mounted on the inside of the frame (36). A locking block (34) is connected to the output end of the cylinder (35). A geared motor (37) is connected to the outside of the worm (31).

2. The positioning mechanism for a surface grinder according to claim 1, characterized in that: The hollow chuck (1) is uniformly provided with a fixing frame (11) on its outside, and the fixing frame (11) is provided with a bolt groove on its outside.

3. The positioning mechanism for a surface grinder according to claim 1, characterized in that: The hollow chuck (1) has an assembly groove (12) in its inner cavity, which is in contact with the worm gear (31).

4. A surface grinder positioning mechanism according to claim 3, characterized in that: The worm (31) is externally connected to a support seat (32), which is connected to the assembly groove (12) via a seated bearing.

5. A surface grinder positioning mechanism according to claim 1, characterized in that: The geared motor (37) is externally connected to a motor mount (38), which is connected to a hollow chuck (1). A reinforcing rib (39) is connected between the motor mount (38) and the hollow chuck (1).

6. A surface grinder positioning mechanism according to claim 1, characterized in that: The locking chuck (33) has a slot on its outside, and the inside of the slot matches the outside of the chuck block (34).

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