A method and apparatus for polishing large pitch sawtooth threads of a cone crusher

Abstract

A method and apparatus for polishing large-pitch sawtooth threads in a cone crusher are disclosed. The polishing method includes the following steps: S1, mounting and aligning the precision-machined threaded workpiece on a vertical lathe; embedding a polishing device with a rotatable polishing wheel into the tool holder slot of the vertical lathe and tightening it; adjusting the helix angle of the polishing wheel based on the helix angle of the threaded workpiece; S2, adjusting the polishing wheel to one end of the thread on the threaded workpiece and making the polishing wheel engage with an initial position on the thread profile surface of the threaded workpiece, followed by one helical polishing. This method and apparatus for polishing large-pitch sawtooth threads in a cone crusher, based on a vertical lathe, achieves polishing of the sawtooth threads by reasonably controlling the polishing wheel, resulting in comprehensive polishing, stable operation, and high safety.

Description

Technical Field

[0001] This invention relates to the field of large-pitch tooth polishing technology, specifically to a method and apparatus for polishing large-pitch sawtooth threads in a cone crusher. Background Technology

[0002] The fixed cone, adjusting ring, and locking ring are the three core components of a cone crusher. These three are connected by a sliding threaded pair formed by a sawtooth thread. During crusher operation, in case of overload or iron leakage, the fixed cone can be quickly lifted and the discharge port adjusted via the threaded pair to achieve overload or iron leakage protection. Taking the adjusting ring of the CC800M cone crusher as an example: its sawtooth thread has a major diameter of Φ2473mm, a groove depth of 27.5mm, a pitch of 101.6mm, thread face angles of (45°, 0°), and a helix angle of 0.749°. Figure 1 As shown. The product requires that the surface roughness of the entire thread profile must reach Ra3.2.

[0003] Due to limitations in machine tool speed and feed rate, improving the surface roughness of large-pitch sawtooth threads is extremely difficult. After finish machining, the best surface roughness can only reach Ra6.3. Our company has traditionally used a method of finish machining followed by manual polishing to improve the surface roughness of sawtooth thread pairs for large multi-cylinder cone crushers. This method is labor-intensive, time-consuming, and produces uneven polishing patterns, noticeable manual polishing marks, and large deviations in thread profile angles, resulting in significant overall quality risks. For mass-produced multi-cylinder cone crushers, thread machining quality and efficiency have become crucial factors restricting the improvement of crusher production efficiency and quality.

[0004] Existing technologies include polishing rods using machine tools with polishing wheels clamped on them. However, when applied to polishing sawtooth thread surfaces, the following problems arise: 1. Because the sawtooth thread profile includes the working tooth profile surface, tooth root, and non-working tooth profile surface, has a helix angle, and the tooth profile angles on both sides are asymmetrical, the polishing wheel and the thread tooth surface are prone to interference during the polishing process, and the root of the thread tooth profile is prone to not being polished properly. 2. For large-diameter, large-pitch sawtooth threads, due to the wide thread grooves and deep tooth profile, the polishing edge of the polishing wheel has an excessively long contact length and a large contact area, which can easily lead to safety accidents such as the hard polishing wheel being crushed or bursting.

[0005] To address the safety and quality issues associated with polishing large-diameter, large-pitch sawtooth threads using hard polishing wheels, this invention patent provides a method and apparatus for polishing large-pitch sawtooth threads in a cone crusher. Summary of the Invention

[0006] The purpose of this invention is to propose a polishing method and polishing device for large-pitch sawtooth threads in a cone crusher. Based on a vertical lathe, the sawtooth threads are polished by reasonably controlling the polishing wheel. The polishing is comprehensive, the operation is stable, and it has high safety.

[0007] The technical solution adopted in this invention is: A method for polishing large-pitch sawtooth threads in a cone crusher includes the following steps: S1. Mount and align the finished threaded workpiece on the vertical lathe, insert the polishing device with a rotatable polishing wheel into the tool holder slot of the vertical lathe, and tighten it. The helix angle of the polishing wheel is adjusted based on the helix angle of the threaded workpiece; S2. Adjust the polishing wheel to one end of the thread on the threaded workpiece and make the polishing wheel fit into an initial position on the thread profile surface of the threaded workpiece. Then perform a spiral polishing. The spiral polishing process is as follows: operate the vertical carriage to drive the threaded workpiece to make a circular motion along its own axis, and make the tool holder groove drive the polishing device to move along the axis of the threaded workpiece at a speed matching the circular motion of the threaded workpiece, so that the polishing wheel of the polishing device polishes the tooth groove along the spiral line of the threaded workpiece. S3. Adjust the position of the polishing wheel on the thread profile surface, and after each adjustment, perform spiral polishing once according to the method in step S2, so that the polishing wheel sequentially completes the polishing of the entire tooth groove, including the working tooth profile surface, tooth root, and non-working tooth profile surface, wherein: When polishing the tooth root of the tooth groove, make the generatrix G1 on the circumferential surface of the polishing wheel parallel and in contact with the tooth root; When polishing the working tooth profile / non-working tooth profile, the tilt angle of the polishing wheel is adjusted according to the angle of the tooth profile so that the generatrix G2 on the circumference of the polishing wheel forms an angle α with the tooth root. One end of the generatrix G2 is in contact with the working tooth profile / non-working tooth profile, and the other end is suspended and does not interfere with other surfaces of the tooth groove, wherein 0°≤α≤5°; S4. Detect the roughness of the threaded workpiece. If the roughness is too high, continue to repeat steps S2 and S3.

[0008] As a preferred embodiment, the polishing wheel is a soft polishing wheel.

[0009] As a preferred embodiment, the generatrix length of the polishing wheel is less than the width of the tooth root of the tooth groove.

[0010] As a preferred embodiment, during the process of adjusting the position of the polishing wheel on the thread profile surface in step S3, the coverage areas of two adjacent spiral polishing positions overlap.

[0011] As a preferred option, when the working tooth profile is 0°, α = 0°; when the working tooth profile is not 0°, 0° < α ≤ 5°.

[0012] As a preferred option, when polishing non-working tooth surfaces, α = 5°.

[0013] A polishing device for a method of polishing large-pitch sawtooth threads of a cone crusher includes a mounting base, a helix angle adjusting seat, and a polishing wheel tilt angle adjusting seat that are rotatably connected in sequence. The mounting base is a base, and the rotation center line of the helix angle adjusting seat is perpendicular to the rotation center line of the polishing wheel tilt angle adjusting seat. A polishing machine is fixed on the polishing wheel tilt angle adjustment seat. The polishing machine has a rotatable polishing wheel. The helix angle of the polishing wheel is adjusted by rotating the helix angle adjustment seat, and the tilt angle of the polishing wheel is adjusted by rotating the polishing wheel tilt angle adjustment seat.

[0014] As a preferred embodiment, the spiral angle adjusting seat is provided with a central hole and a first waist-shaped hole arranged around the central hole; The polishing wheel tilt adjustment seat is provided with a central boss and a second oblong hole concentric with the central boss; Wherein: the central boss passes through the central hole, and bolts are connected in the first oblong hole and the corresponding second oblong hole, and the bolts have rotation space in the second oblong hole.

[0015] As a preferred embodiment, two pointer slots are provided on the polishing wheel tilt adjustment seat with the central boss as the center, and tilt angle scale lines are set on the spiral tilt adjustment seat around the central hole. The tilt angle of the polishing wheel is read at the position of the pointer slots on the tilt angle scale lines.

[0016] The beneficial effects of this invention are: 1. The polishing device has a polishing machine and a rotating polishing wheel. The helix angle and tilt angle of the polishing wheel can be adjusted, so as to cooperate with the vertical lathe to complete the polishing of sawtooth threads.

[0017] 2. Polishing method: Multi-blade horizontal polishing and cyclic polishing are used to perform a comprehensive polishing of the sawtooth threads; Since the working tooth profile P1 may not be 0° and the non-working tooth profile P3 may not be 0°, by adaptively adjusting the angle of the polishing wheel to make it form a certain angle with the working tooth profile and the non-working tooth profile, it is possible to avoid interference with the other tooth profile or tooth root when polishing one tooth profile. Meanwhile, the relatively inclined polishing blade can reduce stress concentration when catering to the helix angle, allowing the polishing blade to deform reasonably when in contact with the working surface, thus reducing the occurrence of breakage.

[0018] 3. The polishing wheel is made of soft material, which makes it easier to avoid the problem of polishing blade breakage and reduce the occurrence of safety accidents. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the thread profile of the cone crusher adjusting ring that is used in conjunction with the polishing device according to the present invention; Figure 2 This is a schematic diagram showing the fit of the polishing wheel of the present invention when it has an inclination angle; Figure 3 This is a schematic diagram of the polishing wheel tilt angle adjustment seat of the present invention; Figure 4 This is a schematic diagram of the helical lift angle adjustment seat of the present invention; Figure 5 This is a schematic diagram showing the state of the polishing wheel of the present invention polishing the tooth root P2; Figure 6 This is a schematic diagram showing the state of the polishing wheel of the present invention polishing the non-working tooth profile P3.

[0021] Reference numerals: 1. Mounting base; 2. Spiral angle adjustment seat; 201. Center hole; 202. First oblong hole; 203. Inclination scale line; 3. Polishing wheel inclination adjustment seat; 301. Center boss; 302. Second oblong hole; 303. Pointer groove; 4. Polishing machine; 5. Polishing wheel; 6. Bolt. Detailed Implementation

[0022] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "a," "an," or "the," etc., used in the specification and claims of this patent application do not express a limitation on quantity, but rather indicate the presence of at least one; the terms "first," "second," and "third," as used herein, should not be considered as a limitation on the order of components, but are merely for distinguishing different components; the terms "comprising," "including," etc., indicate that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function.

[0024] To more clearly describe the specific composition of the polishing method and polishing device for large-pitch sawtooth threads in a cone crusher, the following is a reference: Figure 1-6 This embodiment is described as follows: A method for polishing large-pitch sawtooth threads in a cone crusher includes the following steps: S1: Mount and align the finished threaded workpiece on the vertical lathe, insert the polishing device with the rotatable polishing wheel 5 into the tool holder slot of the vertical lathe, and tighten it with the set screw; The helix angle of the polishing wheel 5 is adjusted based on the helix angle of the threaded workpiece; S2. Adjust the polishing wheel 5 to one end of the thread on the threaded workpiece, and position the polishing wheel 5 at an initial position on the thread profile surface of the threaded workpiece (i.e., ...). Figure 5 or Figure 6 The 0° reference shown is perpendicular to the axis of the threaded workpiece. After fitting, a spiral polishing is performed. The spiral polishing process is as follows: the vertical carriage is operated to drive the threaded workpiece to make a circular motion along its own axis, and the tool holder groove drives the polishing device to move along the axis of the threaded workpiece at a speed matching the circular motion of the threaded workpiece, so that the polishing wheel 5 of the polishing device polishes the tooth groove relative to the spiral line of the threaded workpiece. The generatrix length of the polishing wheel 5 is less than the width of the tooth root P2; that is, the thickness of the polishing wheel 5 is less than the width of the tooth root, so that the circumferential surface of the polishing wheel can fully contact the tooth root.

[0025] To ensure uniform polishing, the coverage areas of two adjacent initial positions overlap during the adjustment of the initial position of polishing wheel 5, which also ensures the quality of polishing. Adjust the position of polishing wheel 5 on the thread profile surface, and after each adjustment, perform spiral polishing according to step S2, so that polishing wheel 5 sequentially completes the polishing of the entire tooth groove, including the working tooth profile surface P1, the tooth root P2, and the non-working tooth profile surface P3, wherein: See Figure 5When polishing the tooth root P2 of the tooth groove, make the generatrix G1 on the circumferential surface of the polishing wheel 5 parallel and in contact with the tooth root; it is worth noting that the polishing wheel 5 is regarded as a cylinder here, and the line perpendicular to the center line on the circumferential surface of the cylinder is the generatrix. When polishing the tooth root P2, the generatrix G1 only needs to be in contact with the tooth root P2, and there is no need to adjust the tilt angle. When polishing the working tooth profile P1 / non-working tooth profile P3, refer to... Figure 6 For sawtooth threads, at least the non-working tooth profile surface P3 is not perpendicular to the axis of the threaded workpiece. Therefore, the tilt angle of the polishing wheel 5 is adjusted according to the angle of the tooth profile surface so that the generatrix G2 on the circumference of the polishing wheel 5 forms an angle α with the tooth root. One end of the generatrix G2 is in contact with the working tooth profile surface P1 / non-working tooth profile surface P3, and the other end is suspended and does not interfere with other surfaces of the tooth groove, where 0°≤α≤5°; α is also the tilt angle of the polishing wheel 5. It is worth noting that, Figure 5 and Figure 6 The working tooth profile surface P1 is shown as 0°. When the working tooth profile surface P1 is not 0°, refer to... Figure 6 The polishing wheel 5 is tilted in a manner that targets the non-working tooth profile P3. For specific polishing instructions, please refer to [link / reference]. Figure 5 When the working tooth profile P1 is 0° (parallel to the 0° reference plane), α = 0°, the tilt angle of the polishing wheel 5 does not need to be adjusted. The 0° working tooth profile P1 can also be polished by the polishing blade at the end face of the polishing wheel. It can also be applied to tooth profiles with smaller angles. When the working tooth profile P1 is not 0°, the range of α is α ≤ 5°.

[0026] When polishing the non-working tooth profile P3 of the sawtooth thread, the optimal tilt angle α of the polishing wheel 5 is 5°. S4: Detect the roughness of the threaded workpiece. If the roughness is too high, continue to repeat steps S2 and S3.

[0027] The polishing method employs multi-blade horizontal polishing and cyclic polishing to perform a comprehensive polishing of the sawtooth-shaped threads. For sawtooth threads, since the working tooth profile P1 may not be 0° and the non-working tooth profile P3 may not be 0°, by adaptively adjusting the angle of the polishing wheel 5 to make it form a certain angle with the working tooth profile P1 and the non-working tooth profile P3, it is possible to avoid interference with the other tooth profile or tooth root P2 when polishing one tooth profile. Meanwhile, the relatively inclined polishing blade can reduce stress concentration when catering to the helix angle, allowing the polishing blade to deform reasonably when in contact with the working surface, thus reducing the occurrence of breakage.

[0028] To improve safety, polishing wheel 5 is made of soft material that conforms to the thread tooth shape, making it easier to avoid the problem of polishing blade breakage and reducing the occurrence of safety accidents.

[0029] like Figure 1 or Figure 2 As shown, a polishing device for polishing a cone crusher with a large pitch sawtooth thread is also provided, including a mounting base 1, a helix angle adjusting seat 2 and a polishing wheel tilt angle adjusting seat 3 connected in sequence. The mounting base 1 is a base, and during installation, the mounting base 1 is fixed in the tool holder groove of the vertical car. The rotation center line of the helix angle adjusting seat 2 and the rotation center line of the polishing wheel tilt angle adjusting seat 3 are perpendicular. A polishing machine 4 is fixed on the polishing wheel tilt angle adjustment seat 3. The polishing machine 4 has a rotatable polishing wheel 5. The helix angle of the polishing wheel 5 is adjusted by the rotation of the helix angle adjustment seat 2, and the tilt angle of the polishing wheel 5 is adjusted by the rotation of the polishing wheel tilt angle adjustment seat 3.

[0030] The polishing device has a polishing machine and a rotating polishing wheel 5. The helix angle and tilt angle of the polishing wheel 5 can be adjusted, so as to cooperate with the vertical lathe to complete the polishing of the sawtooth thread.

[0031] See below Figure 2 , Figure 3 or Figure 4 Taking the rotating connection between the helical angle adjusting seat 2 and the polishing wheel tilt adjusting seat 3 as an example, the specific connection relationship is explained. Specifically, the helical angle adjusting seat 2 is provided with a central hole 201 and a first oblong hole 202 surrounding the central hole 201. The polishing wheel tilt adjusting seat 3 is provided with a central boss 301 and a second oblong hole 302 concentric with the central boss 301 and with a center-to-center distance of 50°. The central boss 301 passes through the central hole 201, and the bolt 6 passes through the first oblong hole 202 and the second oblong hole 302. The bolt 6 has a large-angle second oblong hole 302 with rotation space. When adjusting the angle, the polishing wheel tilt adjustment seat 3 is rotated to rotate along the axis of the central boss 301, so that the tilt angle of the polishing wheel 5 can be adjusted. Two pointer slots 303 are provided on the polishing wheel tilt adjustment seat 3 with the central boss 301 as the center. The tilt angle scale line 203 is set on the spiral tilt angle adjustment seat 2 with the axis of the central hole 201 as the center. When the polishing wheel tilt adjustment seat 3 rotates, the position of the tilt angle scale line 203 corresponding to the pointer slot 303 is the tilt angle of the polishing wheel 5 at this time.

[0032] The rotating connection between the mounting base 1 and the helix angle adjustment seat 2 can adopt the same design. The connection positions of the two are respectively provided with a center hole, a waist-shaped hole, a center boss, a bolt, and a helix angle scale. This connection method will not be described again. It allows the two to be rotatably connected and can measure the angle of the helix angle adjustment seat 2 relative to the mounting base 1, that is, the helix angle of the polishing wheel 5.

[0033] In the above embodiments, the polishing machine 4 can specifically be a right-angle pneumatic polishing machine.

[0034] The parts not described in detail in this embodiment are existing technologies.

[0035] It should be noted that although the present invention has been described through the above embodiments, the present invention may have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A method of polishing large pitch sawtooth threads of a cone crusher, characterized in that, Includes the following steps: S1. Mount and align the finished threaded workpiece on the vertical lathe, insert the polishing device with the rotatable polishing wheel (5) into the tool holder slot of the vertical lathe, and tighten it. The helix angle of the polishing wheel (5) is adjusted based on the helix angle of the threaded workpiece; S2. Adjust the polishing wheel (5) to one end of the thread on the threaded workpiece, and make the polishing wheel (5) fit against an initial position on the thread profile surface of the threaded workpiece. Then perform a spiral polishing. The spiral polishing process is as follows: operate the vertical carriage to drive the threaded workpiece to make a circular motion along its own axis, and make the tool holder groove drive the polishing device to move along the axis of the threaded workpiece at a speed matching the circular motion of the threaded workpiece, so that the polishing wheel (5) of the polishing device polishes the tooth groove relative to the spiral line of the threaded workpiece. S3. Adjust the position of the polishing wheel (5) on the thread profile surface, and after each adjustment, perform spiral polishing according to the method in step S2, so that the polishing wheel (5) sequentially completes the polishing of the entire tooth groove, including the working tooth profile surface, tooth root, and non-working tooth profile surface, wherein: When polishing the tooth root of the tooth groove, make the generatrix G1 on the circumferential surface of the polishing wheel (5) fit parallel to the tooth root; When polishing the working tooth profile / non-working tooth profile, the tilt angle of the polishing wheel (5) is adjusted according to the angle of the tooth profile so that the generatrix G2 on the circumferential surface of the polishing wheel (5) forms an angle α with the tooth root. One end of the generatrix G2 is in contact with the working tooth profile / non-working tooth profile, and the other end is suspended and does not interfere with other surfaces of the tooth groove. Wherein, 0°≤α≤5°; the polishing wheel (5) forms a certain angle with the working tooth profile or non-working tooth profile to avoid interference with the other tooth profile or tooth root when polishing one tooth profile. S4. Detect the roughness of the threaded workpiece. If the roughness is too high, continue to repeat steps S2 and S3.

2. The method for polishing large-pitch sawtooth threads in a cone crusher according to claim 1, characterized in that: The polishing wheel (5) is a soft polishing wheel.

3. The method for polishing large-pitch sawtooth threads in a cone crusher according to claim 1, characterized in that: The length of the generatrix of the polishing wheel (5) is less than the width of the tooth root of the tooth groove.

4. The method for polishing large-pitch sawtooth threads in a cone crusher according to claim 1, characterized in that: In step S3, during the process of adjusting the position of the polishing wheel (5) on the thread profile surface, the coverage areas of two adjacent spiral polishing positions overlap.

5. The method for polishing large-pitch sawtooth threads in a cone crusher according to claim 1, characterized in that: When the working tooth profile is 0°, α = 0°; when the working tooth profile is not 0°, 0° < α ≤ 5°.

6. The method for polishing large-pitch sawtooth threads in a cone crusher according to claim 1, characterized in that: When polishing non-working tooth surfaces, α = 5°.

7. The polishing apparatus used in the polishing method for a large-pitch sawtooth thread of a cone crusher according to any one of claims 1-6, characterized in that: It includes a mounting base (1), a spiral angle adjustment seat (2), and a polishing wheel tilt angle adjustment seat (3) that are rotatably connected in sequence. The mounting base (1) is the base, and the rotation center line of the spiral angle adjustment seat (2) is perpendicular to the rotation center line of the polishing wheel tilt angle adjustment seat (3). A polishing machine (4) is fixed on the polishing wheel tilt angle adjustment seat (3). The polishing machine (4) has a rotatable polishing wheel (5). The helix angle of the polishing wheel (5) is adjusted based on the rotation of the helix angle adjustment seat (2), and the tilt angle of the polishing wheel (5) is adjusted based on the rotation of the polishing wheel tilt angle adjustment seat (3).

8. The polishing device used in the polishing method for a large-pitch sawtooth thread of a cone crusher according to claim 7, characterized in that: The spiral angle adjustment seat (2) is provided with a central hole (201) and a first waist-shaped hole (202) surrounding the central hole (201); A central boss (301) and a second waist-shaped hole (302) concentric with the central boss (301) are provided on the polishing wheel tilt adjustment seat (3); Wherein: the central boss (301) passes through the central hole (201), and the first waist-shaped hole (202) and the corresponding second waist-shaped hole (302) are connected with bolts (6), and the bolts (6) have rotation space in the second waist-shaped hole (302).

9. The polishing device used in the polishing method of large pitch sawtooth thread of cone crusher according to claim 8, has two pointer slots (303) arranged on the polishing wheel tilt angle adjustment seat (3) with the central boss (301) as the center, and a tilt angle scale line (203) surrounding the central hole (201) is set on the helix angle adjustment seat (2), and the tilt angle of the polishing wheel (5) is read at the position of the pointer slot (303) on the tilt angle scale line (203).

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