Grinding wheel fixing device of worm gear grinding machine

Abstract

The worm grinding machine's grinding wheel fixing device is characterized by comprising a grinding wheel shaft fixing handle, a grinding wheel mounting seat sleeved on the grinding wheel shaft fixing handle, a grinding wheel sleeved on the grinding wheel mounting seat, a first protrusion formed at one end of the grinding wheel mounting seat, a straight gear, a locking ring and a grinding wheel pressing cover which are sequentially sleeved on the grinding wheel shaft fixing handle from inside to outside, and the straight gear and the locking ring are fixedly connected with the grinding wheel shaft fixing handle and the grinding wheel mounting seat respectively, and two end surfaces of the grinding wheel are in contact with the first protrusion and the grinding wheel pressing cover respectively; and a locking device assembly is arranged in the locking ring to press the straight gear and the grinding wheel pressing cover. The tangential load of the grinding wheel during machining can strengthen the fixing force of the grinding wheel and improve the installation stability; and the structure is simple and convenient to maintain.

Description

Technical Field

[0001] This invention belongs to the technical field of grinding wheel gear grinding machines, and relates to a grinding wheel fixing device for worm gear grinding machines. Background Technology

[0002] Worm wheel grinding machines are high-efficiency gear finishing equipment. The working process of a worm wheel grinding machine is similar to the meshing process of a worm gear; the gear workpiece being machined is equivalent to the worm, and the grinding wheel is shaped like the worm. In addition to the wear caused by the grinding process itself, the frequent dressing of the grinding wheel required by worm wheel grinding machines also leads to very rapid wear. Therefore, in mass production, frequent grinding wheel replacements are necessary.

[0003] Traditional grinding wheel fixing methods involve clamping the grinding wheel with a pressure cap and locking it axially along the grinding wheel shaft with multiple screws. This entire assembly and disassembly process is time-consuming and impacts processing efficiency. In worm gear grinding machines, the grinding wheel is typically mounted directly on the grinding wheel shaft's mechanical structure. The grinding wheel shaft's mechanical structure usually uses axial locking or external expansion connections, leaving the shaft itself in a free state. Therefore, the stiffness of the shaft in the rotational direction is entirely determined by the material and structure of the components. To improve the machining accuracy of the machine tool, the grinding wheel shaft still has potential for increased rigidity, namely, torsional preload in the rotational direction. However, currently, no measures are taken to address this in engineering practice. Summary of the Invention

[0004] The purpose of this invention is to provide a grinding wheel fixing device for a worm gear grinding machine, which can simultaneously improve the efficiency of grinding wheel replacement and structural rigidity.

[0005] The technical solution adopted in this invention is a grinding wheel fixing device for a worm gear grinding machine, including a grinding wheel shaft fixing handle, a grinding wheel mounting seat sleeved on the grinding wheel shaft fixing handle, a grinding wheel sleeved on the grinding wheel mounting seat, a first protrusion formed at one end of the grinding wheel mounting seat, a spur gear, a locking ring, and a grinding wheel clamping cover sequentially sleeved on the grinding wheel shaft fixing handle from the inside to the outside, the spur gear and the locking ring being fixedly connected to the grinding wheel shaft fixing handle and the grinding wheel mounting seat respectively, and the two end faces of the grinding wheel contacting the first protrusion and the grinding wheel clamping cover respectively; a locking device assembly for clamping the spur gear and the grinding wheel clamping cover is provided inside the locking ring.

[0006] The invention is further characterized by:

[0007] The locking assembly includes a telescopic pin, a cylindrical rack that is movably sleeved on the telescopic pin, and a locking ring with a first through hole and a second through hole that are connected to each other. The axes of the first through hole and the second through hole are parallel to the tangent of the locking ring. The telescopic pin is located in the first through hole, the cylindrical rack is located in the second through hole, and the grinding wheel clamping cover has a third through hole that is connected to the first through hole and a fourth through hole that is connected to the second through hole. A clamping element that is adapted to the end of the telescopic pin is fixed in the third through hole. The cylindrical rack meshes with a spur gear.

[0008] The end of the telescopic pin away from the cylindrical rack is a square wedge, and the clamping part is a wedge. The inclined surface of the square wedge of the telescopic pin is adapted to the inclined surface of the wedge.

[0009] The cylindrical rack has a groove at the end away from the telescopic pin that is used to drive its rotation.

[0010] The diameter of the fourth through hole is larger than the diameter of the second through hole.

[0011] The beneficial effects of this invention are as follows: The grinding wheel fixing device of the worm gear grinding machine of this invention clamps the grinding wheel through a two-stage force-increasing method of threaded structure combined with wedge compression, which can meet the fixing force requirements of grinding wheel installation with fewer bolts, thereby improving the efficiency of grinding wheel installation and disassembly; the mechanical structure of the grinding wheel shaft generates a torsional torque around its own rotation axis after the grinding wheel is installed, which is equivalent to a preload in the rotation direction of the grinding wheel shaft, thereby improving the mechanical rigidity of the grinding wheel shaft in the rotation direction and improving the machining accuracy; the tangential load on the grinding wheel during machining can strengthen the fixing force of the grinding wheel and improve the installation stability; the structure is simple and maintenance is convenient. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the grinding wheel fixing device of the worm gear grinding machine of the present invention;

[0013] Figure 2 This is a top view of the grinding wheel fixing device of the worm gear grinding machine of the present invention;

[0014] Figure 3 This is a cross-sectional view of the grinding wheel fixing device of the worm gear grinding machine of the present invention.

[0015] In the figure, 1. Grinding wheel shaft fixing handle, 2. Grinding wheel mounting seat, 3. Grinding wheel, 4. Spur gear, 5. Locking ring, 6. Grinding wheel clamping cover, 7. Locking device assembly, 7-1. Telescopic pin, 7-2. Cylindrical spur rack, 7-3. Clamping element, 8. First through hole, 9. Second through hole, 10. Third through hole, 11. Fourth through hole, 12. Second protrusion, 13. First protrusion. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] Example 1

[0018] The grinding wheel fixing device of a worm gear grinding machine, such as Figure 1 As shown, it includes a grinding wheel shaft fixing handle 1, a grinding wheel mounting seat 2 is sleeved on the grinding wheel shaft fixing handle 1, a grinding wheel 3 is sleeved on the grinding wheel mounting seat 2, one end of the grinding wheel mounting seat 2 forms a protrusion, and a spur gear 4, a locking ring 5, and a grinding wheel clamping cover 6 are sequentially sleeved on the grinding wheel shaft fixing handle 1 from the inside to the outside. The spur gear 4 and the locking ring 5 are fixedly connected to the grinding wheel shaft fixing handle 1 and the grinding wheel mounting seat 2, respectively. The two end faces of the grinding wheel 3 are in contact with the protrusion and the grinding wheel clamping cover 6, respectively. A locking device assembly 7 is provided inside the locking ring 5 to clamp the spur gear 4 and the grinding wheel clamping cover 6.

[0019] Example 2

[0020] The grinding wheel fixing device of a worm gear grinding machine, such as Figure 1 As shown, it includes a grinding wheel shaft fixing handle 1, a grinding wheel mounting seat 2 is sleeved on the grinding wheel shaft fixing handle 1, a grinding wheel 3 is sleeved on the grinding wheel mounting seat 2, one end of the grinding wheel mounting seat 2 forms a protrusion, and a spur gear 4, a locking ring 5, and a grinding wheel clamping cover 6 are sequentially sleeved on the grinding wheel shaft fixing handle 1 from the inside to the outside. The spur gear 4 and the locking ring 5 are fixedly connected to the grinding wheel shaft fixing handle 1 and the grinding wheel mounting seat 2, respectively. The two end faces of the grinding wheel 3 are in contact with the protrusion and the grinding wheel clamping cover 6, respectively. A locking device assembly 7 is provided inside the locking ring 5 to clamp the spur gear 4 and the grinding wheel clamping cover 6.

[0021] like Figure 2 As shown, the locking assembly 7 includes a telescopic pin 7-1, a cylindrical rack 7-2 movably sleeved on the telescopic pin 7-1, and a locking ring 5 with a first through hole 8 and a second through hole 9 connected to each other. The axes of the first through hole 8 and the second through hole 9 are parallel to the tangent of the locking ring 5. The telescopic pin 7-1 is located in the first through hole 8, and the cylindrical rack 7-2 is located in the second through hole 9. The grinding wheel clamping cover 6 has a third through hole 10 communicating with the first through hole 8 and a fourth through hole 11 communicating with the second through hole 9, respectively. Figure 3 As shown, a clamping member 7-3 adapted to the end of the telescopic pin 7-1 is fixed in the third through hole 10, and the cylindrical spur rack 7-2 meshes with the spur gear 4. The end of the telescopic pin 7-1 away from the cylindrical spur rack 7-2 is a square wedge, and the clamping member 7-3 is a wedge. The inclined surface of the square wedge of the telescopic pin 7-1 is adapted to the inclined surface of the wedge.

[0022] Example 3

[0023] The grinding wheel fixing device of a worm gear grinding machine, such as Figure 1As shown, the device includes a grinding wheel shaft fixing handle 1, a grinding wheel mounting seat 2 sleeved on the grinding wheel shaft fixing handle 1, and further, a second protrusion 12 is formed at one end of the grinding wheel shaft fixing handle 1. The grinding wheel 3 is sleeved on the outside of the grinding wheel mounting seat 2. A first protrusion 13 is formed at one end of the grinding wheel mounting seat 2. The second protrusion 12 abuts against the first protrusion 13 and is fixed to the first protrusion 13 by screws. The grinding wheel shaft fixing handle 1 is sequentially sleeved with a spur gear 4, a locking ring 5, and a grinding wheel clamping cover 6 from the inside out. The spur gear 4 and the locking ring 5 are fixedly connected to the grinding wheel shaft fixing handle 1 and the grinding wheel mounting seat 2, respectively. The two end faces of the grinding wheel 3 are in contact with the first protrusion 13 and the grinding wheel clamping cover 6, respectively. A locking device assembly 7 is provided inside the locking ring 5 to clamp the spur gear 4 and the grinding wheel clamping cover 6.

[0024] like Figure 2 As shown, the locking assembly 7 includes a telescopic pin 7-1, which is externally threaded with a cylindrical rack 7-2. The locking ring 5 has a first through hole 8 and a second through hole 9 connected within it. The axes of the first through hole 8 and the second through hole 9 are parallel to the tangent of the locking ring 5. The telescopic pin 7-1 is located within the first through hole 8, which is a square hole adapted to the telescopic pin 7-1, restricting its rotational movement. The cylindrical rack 7-2 is located within the second through hole 9, which is a circular hole. The grinding wheel clamping cover 6 has a third through hole 10 connected to the first through hole 8 and a fourth through hole 11 connected to the second through hole 9. The diameter of the fourth through hole 11 is larger than the diameter of the second through hole 9. In use, the external mechanism extends into the fourth through hole 11, and the cylindrical rack 7-2 is rotated to make the telescopic pin 7-1 move linearly along the first through hole 8 and the third through hole 10.

[0025] like Figure 3 As shown, a clamping member 7-3 adapted to the end of the telescopic pin 7-1 is fixed in the third through hole 10. The cylindrical spur rack 7-2 meshes with the spur gear 4. The external shape of the cylindrical spur rack 7-2 is equivalent to the solid obtained by rotating the spur gear 4 once. During rotation, since the spur gear 4 is fixed on the grinding wheel shaft fixing handle 1, the spur gear 4 will not move. Therefore, the cylindrical spur rack 7-2 meshing with the spur gear 4 cannot move in the axial direction, but it can transmit force to the spur gear 4 through its teeth. In this embodiment, the end of the telescopic pin 7-1 away from the cylindrical spur rack 7-2 is a square wedge, and the clamping member 7-3 is a wedge. The inclined surface of the square wedge of the telescopic pin 7-1 is adapted to the inclined surface of the wedge. The telescopic pin 7-1 moves linearly along the first through hole 8 and the third through hole 10, pressing the wedge, that is, pressing the grinding wheel clamping cover 6. The grinding wheel clamping cover 6 presses the grinding wheel 3 to lock the grinding wheel 3.

[0026] In this embodiment, the cylindrical rack 7-2 has a groove 7-4 at the end furthest from the telescopic pin 7-1 for driving its rotation. The groove 7-4 can be hexagonal in shape.

[0027] The working principle of the grinding wheel fixing device of the worm gear grinding machine of the present invention is as follows:

[0028] When changing the grinding wheel 3 on the machine tool during operation, first insert the external mechanism into the groove 7-4, rotate the cylindrical rack 7-2, and the telescopic pin 7-1 will disengage from the clamping part 7-3 until the telescopic pin 7-1 is fully retracted into the hole of the locking ring 5. At this point, the grinding wheel clamping cover 6 can be removed axially, and the grinding wheel 3 can be taken out. After replacing the grinding wheel 3, install the grinding wheel clamping cover 6, and then rotate the cylindrical spur rack 7-2. The grinding wheel clamping cover 6 will clamp the grinding wheel 3 through the contact between the telescopic pin 7-1 and the wedge. At this time, the cylindrical spur gear 7-2 pushes along the axial direction of the telescopic pin 7-1 due to its internal thread, that is, it squeezes the spur gear 4 in the tangential direction. The outer spur teeth of the cylindrical spur rack 7-2 mesh with the spur gear 4. Since the spur gear 4 is fixed to the grinding wheel shaft fixing handle 1, there is a tangential force between the grinding wheel shaft fixing handle 1 and the grinding wheel mounting seat 2. This tangential force constitutes a torque on the shaft. Since the grinding wheel mounting seat 2 and the grinding wheel shaft fixing handle 1 are fixed at the other end, the torque will cause the grinding wheel mounting seat 2 and the grinding wheel shaft fixing handle 1 to be pre-tightened in the torsional direction, which can improve the rigidity of the structure.

[0029] When the machine tool is in the machining state, the tangential force on the grinding wheel 3 will be transmitted to the wedge clamping part 7-3 and the telescopic pin 7-1, thereby strengthening the clamping force of the grinding wheel 3 and improving the stability of the installation.

[0030] Through the above methods, the grinding wheel fixing device of the worm gear grinding machine of the present invention clamps the grinding wheel by means of a two-stage force amplification method of threaded structure and wedge compression. Only the spur gear 4, the grinding wheel shaft fixing handle 1, and the locking ring are fixed to the grinding wheel mounting seat with bolts. The fixing force requirement for grinding wheel installation can be met with fewer bolts, improving the efficiency of grinding wheel installation and disassembly. After the grinding wheel is installed, the mechanical structure of the grinding wheel shaft will generate a torsional torque around its own rotation axis, which is equivalent to a preload in the rotation direction of the grinding wheel shaft, improving the mechanical rigidity of the grinding wheel shaft in the rotation direction and improving the machining accuracy. When the grinding wheel is subjected to tangential load, the fixing force of the grinding wheel can be strengthened, improving the installation stability. The structure is simple and maintenance is convenient.

Claims

1. A grinding wheel fixing device of a worm grinding machine, characterized in that, The grinding wheel shaft fixing handle (1) is sleeved with a grinding wheel mounting seat (2), the grinding wheel (3) is sleeved outside the grinding wheel mounting seat (2), the grinding wheel mounting seat (2) is formed with a first protrusion (13) at one end, the grinding wheel shaft fixing handle (1) is sequentially sleeved with a straight gear (4), a locking ring (5) and a grinding wheel pressing cover (6) from inside to outside, the straight gear (4) and the locking ring (5) are fixedly connected with the grinding wheel shaft fixing handle (1) and the grinding wheel mounting seat (2) respectively, the grinding wheel (3) is in contact with the first protrusion (13) and the grinding wheel pressing cover (6) at two end faces respectively; the locking ring (5) is provided with a locker assembly (7) for pressing the straight gear (4) and the grinding wheel pressing cover (6) inside; The locker assembly (7) comprises a telescopic bolt (7-1), the telescopic bolt (7-1) is movably sleeved with a cylindrical spur rack (7-2) outside, the locking ring (5) is provided with a first through hole (8) and a second through hole (9) which are in communication, the axis of the first through hole (8) and the second through hole (9) is parallel to the tangent of the locking ring (5), the telescopic bolt (7-1) is located in the first through hole (8), the cylindrical spur rack (7-2) is located in the second through hole (9), the grinding wheel pressing cover (6) is provided with a third through hole (10) and a fourth through hole (11) which are in communication with the first through hole (8) and the second through hole (9) respectively, the third through hole (10) is fixedly provided with a pressing piece (7-3) which is matched with the end of the telescopic bolt (7-1), and the cylindrical spur rack (7-2) is engaged with the straight gear (4).

2. The worm wheel grinding machine's grinding wheel fixing device according to claim 1, characterized in that, The end of the telescopic bolt (7-1) away from the cylindrical spur rack (7-2) is a square wedge, the pressing piece (7-3) is a wedge, and the square wedge of the telescopic bolt (7-1) is matched with the wedge.

3. The worm wheel grinding machine's grinding wheel fixing device according to claim 1, characterized in that, The end of the cylindrical spur rack (7-2) away from the telescopic bolt (7-1) is provided with a groove (7-4) for driving the rotation of the cylindrical spur rack (7-2) inward.

4. The worm wheel grinding machine's grinding wheel fixing device according to claim 1, characterized in that, The diameter of the fourth through hole (11) is greater than that of the second through hole (9).

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