A trephine

Abstract

This utility model relates to a ring saw, including a ring saw blade, a body, a head shell disposed at the front end of the body, a drive wheel disposed on the head shell, and a saw blade positioning mechanism connected to the head shell. The drive wheel is driven by a drive device disposed within the body and is pulsatorically connected to the ring saw blade. The saw blade positioning mechanism includes a housing connected to the head shell, two positioning wheels disposed on the housing and positioning the ring saw blade, and two tensioning wheel assemblies disposed on the housing. Each of the two tensioning wheel assemblies includes a bushing and a tensioning wheel rotatably disposed on the bushing. The two positioning wheels and the two tensioning wheels are symmetrically disposed on both sides of the ring saw blade and in surface contact with it. The housing has two sliding cavities, each of which is slidably connected to a sliding seat integrally formed with the corresponding bushing. This utility model not only achieves automatic tension compensation but also has the advantages of simple structure and low cost.

Description

Technical Field

[0001] This utility model relates to the field of cutting equipment, and in particular to a ring saw. Background Technology

[0002] As a highly efficient cutting tool, the trestle is widely used in cutting materials such as wood, building materials, and even metals.

[0003] However, existing ring saw tensioning structures have several shortcomings. First, traditional tensioning wheel assemblies are complex, with numerous parts and cumbersome assembly processes, resulting in high production costs. Second, tension is usually adjusted via a threaded bolt, but under prolonged high-frequency vibration and heavy load operation, the adjusting bolt is prone to loosening, leading to tension attenuation. This causes unstable saw blade operation, resulting in vibration or even deviation, severely affecting the quality of the cut surface and the lifespan of the saw blade. Furthermore, existing tensioning structures lack automatic compensation capabilities. When the saw blade slightly elongates due to thermal expansion and contraction or wear, it cannot maintain a constant tension, further exacerbating the saw blade's instability. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a ring saw that can not only achieve automatic tension compensation, but also has the advantages of simple structure and low cost.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A ring saw includes a ring saw blade, a body, a head shell disposed at the front end of the body, a drive wheel disposed on the head shell, and a saw blade positioning mechanism connected to the head shell. The drive wheel is driven by a drive device disposed in the body and is connected to the ring saw blade. The saw blade positioning mechanism includes a housing connected to the head shell, two positioning wheels disposed on the housing and positioning the ring saw blade, and two tensioning wheel assemblies disposed on the housing. Each of the two tensioning wheel assemblies includes a bushing and a tensioning wheel rotatably disposed on the bushing. The two positioning wheels and the two tensioning wheels are symmetrically disposed on both sides of the ring saw blade and in surface contact with it. The housing has two sliding cavities, each of which is slidably connected to a slide seat integrally formed with the corresponding bushing. A compression spring is disposed on the side of the slide seat facing away from the ring saw blade. The compression spring presses against the slide seat, thereby causing the tensioning wheel to elastically press against the ring saw blade.

[0007] Furthermore, the sliding cavity is provided with a partition and two adjusting bolts symmetrically distributed on both sides of the corresponding bushing. One end of each adjusting bolt passes through the partition and extends into the corresponding slide block and is threadedly connected thereto. The other end of each adjusting bolt is a bolt head and is spaced apart from the partition. Each adjusting bolt is fitted with a compression spring, which is located between the corresponding partition and the slide block.

[0008] Furthermore, the sliding cavity is open at both ends, and the cavity opening facing away from the annular saw blade is covered with an end cap; a notch is provided on the top wall of the cavity opening near the annular saw blade for the bushing and tension wheel to extend out.

[0009] Furthermore, the housing is equipped with a circular guide plate for reducing saw blade vibration during operation. The circular guide plate is coaxially arranged with the annular saw blade and located inside the annular saw blade. The circular guide plate is provided with multiple water spray holes for cooling the saw blade and removing slag.

[0010] Furthermore, the annular saw blade has two annular grooves on the side that contacts the positioning wheel surface, and two annular flanges are spaced apart on the outer periphery of the two positioning wheels, which respectively engage with the two annular grooves.

[0011] Furthermore, the inner ring of the annular saw blade is provided with an internal gear, and the outer circumference of the drive wheel is provided with an external gear that meshes with the internal gear.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] First, automatic tension compensation: This utility model uses a compression spring set on the back of the slide to continuously and elastically press against the slide, so that the tension wheel always keeps a constant pressure against the annular saw blade. This structure can realize automatic compensation of the saw blade tension. When the saw blade elongates slightly due to temperature rise or load, the spring can push the slide and tension wheel to move accordingly, always maintaining the best tension state. This effectively avoids the saw blade shaking and deviation caused by tension relaxation, and greatly improves cutting accuracy and running stability.

[0014] Secondly, the structure is simple: the slide and bushing adopt an integral molding structure, reducing the number of parts and assembly interfaces. This not only simplifies the assembly process and reduces manufacturing costs, but also enhances the structural rigidity and overall strength of the entire tension wheel assembly, making it less prone to deformation when subjected to vibration and lateral pressure from the saw blade, thus ensuring positioning accuracy. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of a ring saw according to this utility model.

[0016] Figure 2 yes Figure 1 A 3D diagram after removing the circular guide plate.

[0017] Figure 3 yes Figure 1 Front view diagram.

[0018] Figure 4 yes Figure 3 Schematic diagram of cross-section at AA.

[0019] Figure 5 This is a three-dimensional schematic diagram of the tensioning wheel assembly in this utility model.

[0020] Figure 6 This is a three-dimensional schematic diagram of the shell in this utility model. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings.

[0022] like Figures 1 to 6 As shown in the figure, a ring saw according to an embodiment of the present invention includes a ring saw blade 1, a body 2, a head shell 3 disposed at the front end of the body 2, a drive wheel 4 disposed on the head shell 3, and a saw blade positioning mechanism 5 connected to the head shell 3. The drive wheel 4 is driven by a drive device disposed in the body 2 (not shown in the figure) and is connected to the ring saw blade 1. The saw blade positioning mechanism 5 includes a housing 51 connected to the head shell 3, two positioning wheels 52 disposed on the housing 51 and positioning the ring saw blade 1, and two tensioning wheel assemblies 53 disposed on the housing 51. Each tensioning wheel assembly 53 includes a bushing 531 and a tensioning wheel 532 rotatably mounted on the bushing 531. Two positioning wheels 52 and two tensioning wheels 532 are symmetrically arranged on both sides of the annular saw blade 1 and in surface contact with it. The housing 51 is provided with two sliding cavities 511. Each of the two sliding cavities 511 is slidably connected to a slide seat 512 integrally formed with the corresponding bushing 531. A compression spring 513 is provided on the side of the slide seat 512 facing away from the annular saw blade 1. The compression spring 513 presses against the slide seat 512, thereby causing the tensioning wheel 532 to elastically press against the annular saw blade 1.

[0023] As described above, the slide cavity 511 is provided with a partition 514 and two adjusting bolts 515 symmetrically distributed on both sides of the corresponding bushing 531. One end of each adjusting bolt 515 passes through the partition 514 and extends into the corresponding slide block 512 and is threadedly connected thereto. The other end of each adjusting bolt 515 is a bolt head and is spaced apart from the partition 514. Each adjusting bolt 515 is fitted with a compression spring 513, which is located between the corresponding partition 514 and the slide block 512.

[0024] As described above, the sliding cavity 511 is open at both ends, and the cavity opening of the sliding cavity 511 facing away from the annular saw blade 1 is covered with an end cap 516 by bolts; a notch 517 is provided on the top wall of the cavity opening of the sliding cavity 511 near the annular saw blade 1 for the bushing 531 and the tensioning wheel 532 to extend out.

[0025] As described above, a circular guide plate 54 is installed on the housing 51 to reduce saw blade vibration during operation. The circular guide plate 54 is coaxially arranged with the annular saw blade 1 and located inside the annular saw blade 1. The circular guide plate 54 is provided with multiple water spray holes (not shown in the figure) for cooling the saw blade and removing slag.

[0026] As described above, the annular saw blade 1 has two annular grooves 11 on the side that contacts the positioning wheel 52, and two annular flanges 521 are provided at intervals on the outer periphery of the two positioning wheels 52, and the two annular flanges 521 are respectively engaged with the two annular grooves 11.

[0027] As described above, the inner ring of the annular saw blade 1 is provided with an internal gear 12, and the outer circumference of the drive wheel 4 is provided with an external gear 41 that meshes with the internal gear 12.

[0028] The replacement procedure for ring saw blade 1 is as follows:

[0029] Use a wrench to open the two end caps 516 on the housing 51, and then use the wrench to tighten the adjusting bolt 515 so that the two slide blocks 512 in the two slide chambers 511 move away from the ring saw blade 1 until a gap is formed that allows the ring saw blade 1 to be removed. During this process, the bolt head of the adjusting bolt 515 will first abut against the partition 514. Continue to tighten it to move the slide block 512. After replacing the ring saw blade 1, tighten the adjusting bolt 515 in the opposite direction until the tension wheel 532 presses against the ring saw blade 1 and reaches the expected tension. At this time, a gap is formed between the bolt head and the partition 514. Finally, close the two end caps 516 to complete the replacement of the ring saw blade 1.

[0030] The above description is merely a preferred embodiment of the present utility model and should not be construed as limiting the scope of the present utility model. Any simple equivalent changes and modifications made in accordance with the scope of the present utility model patent application and the description of the utility model shall still fall within the scope of the present utility model patent.

Claims

1. A ring saw, comprising a ring saw blade, a body, a head shell disposed at the front end of the body, a drive wheel disposed on the head shell, and a saw blade positioning mechanism connected to the head shell, wherein the drive wheel is driven by a drive device disposed within the body and is pulsatorically connected to the ring saw blade, and the saw blade positioning mechanism comprises a housing connected to the head shell, two positioning wheels disposed on the housing and positioning the ring saw blade, and two tensioning wheel assemblies disposed on the housing, each of the two tensioning wheel assemblies comprising a bushing and a tensioning wheel rotatably disposed on the bushing, the two positioning wheels and the two tensioning wheels being symmetrically disposed on both sides of the ring saw blade and in surface contact with it, characterized in that: The housing is provided with two sliding cavities, each of which is slidably connected to a slide seat integrally formed with the corresponding bushing. A compression spring is provided on the side of the slide seat facing away from the annular saw blade. The compression spring presses against the slide seat, thereby causing the tension wheel to elastically press against the annular saw blade.

2. Annular saw according to claim 1, characterized in that The sliding cavity is provided with a partition and two adjusting bolts symmetrically distributed on both sides of the corresponding bushing. One end of each adjusting bolt passes through the partition and extends into the corresponding slide block and is threadedly connected thereto. The other end of each adjusting bolt is a bolt head and is spaced apart from the partition. Each adjusting bolt is fitted with a compression spring, which is located between the corresponding partition and the slide block.

3. Annular saw according to claim 2, characterized in that: The sliding cavity is open at both ends, and the cavity opening facing away from the annular saw blade is covered with an end cap; a notch is provided on the top wall of the cavity opening near the annular saw blade for the bushing and tension wheel to extend out.

4. The ring saw of claim 1, wherein: The housing is equipped with a circular guide plate to reduce saw blade vibration during operation. The circular guide plate is coaxially arranged with the annular saw blade and located inside the annular saw blade. The circular guide plate is provided with multiple water spray holes for cooling the saw blade and removing slag.

5. The ring saw of claim 1, wherein: The annular saw blade has two annular grooves on the side that contacts the positioning wheel. The outer circumference of the two positioning wheels is provided with two annular flanges at intervals, and the two annular flanges are respectively engaged with the two annular grooves.

6. The ring saw of claim 1, wherein: The inner ring of the annular saw blade is provided with an internal gear, and the outer circumference of the drive wheel is provided with an external gear that meshes with the internal gear.

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