Adjustable blade limiting device of a trephine

Abstract

The technical scheme belongs to the technical field of ring saws and specifically relates to an adjustable saw blade limiting device of a ring saw, which comprises a shell, an annular saw blade can be installed on the front side of the shell, the shell is provided with a sliding cavity, and the adjustable saw blade limiting device is characterized in that it further comprises an adjusting assembly arranged in the sliding cavity, the adjusting assembly comprises a sliding block and an adjusting screw rod arranged on the sliding block, the sliding block slides in the sliding cavity, the adjusting screw rod is rotationally arranged relative to the sliding cavity, one end of the adjusting screw rod penetrates through the shell, the screw head of the adjusting screw rod abuts against the outer wall of the shell, the other end of the adjusting screw rod is threadedly connected to the sliding block, two swing wheel assemblies are hingedly connected to the shell, and the left and right sides of the sliding block are respectively movably connected with corresponding swing wheel assemblies; the position of the sliding block is adjusted by rotating the adjusting screw rod, the sliding block drives the two swing wheel assemblies on the left and right sides to swing synchronously, the two swing wheel assemblies are matched to abut against the inner edge of the annular saw blade, the limiting requirement of different-diameter ring saw blades is quickly met, and the operation efficiency is improved.

Description

Technical Field

[0001] This technical solution relates to the field of ring saw technology, specifically to an adjustable saw blade limiting device for ring saws. Background Technology

[0002] A ring saw is a cutting tool characterized by a ring-shaped saw blade. It achieves precise drilling or cutting by rotating the ring-shaped saw blade at high speed. It is suitable for woodworking, metal processing and construction. Modern ring saws are mostly electrically driven, with adjustable diameter and speed, combining high efficiency and safety to meet the precision operation needs of various scenarios.

[0003] For example, Chinese patent CN222628230U discloses a ring saw with transmission and limiting devices, including a main drive unit, a handle, a positioning rod, a water spray plate, a dust cover, a grip, and a water baffle. The front end of the main drive unit is provided with a reduction transmission device, and the front end of the reduction transmission device is connected to a head shell one and a head shell two. Between the head shell one and the head shell two, there is a ring saw blade, a left and right tension adjustment seat, and a front and rear tension adjustment device. The tension adjustment screw is pressed against one side of the left and right tension adjustment seat. The left and right tension adjustment seat is moved inward or outward to adjust the left and right tension of the ring saw blade. The front and rear tension adjustment device is provided in front of the inner ring of the ring saw blade to limit the forward movement of the ring saw blade, and the tension can be adjusted back and forth.

[0004] Existing ring saw blades require the use of both left and right tension adjustment seats and front and rear tension adjustment devices to position and fix ring saw blades of different sizes. This dual-adjustment-device collaborative working method has a complex structure, the adjustment process is cumbersome and time-consuming, and the clamping stability and guiding effect for different sizes of ring saw blades are inconsistent, resulting in low overall operating efficiency and inconvenience in use, which needs to be improved. Summary of the Invention

[0005] To address the problem of cumbersome positioning operations for different specifications of ring saw blades in existing dual-adjustment devices, this technical solution provides an adjustable saw blade limiting device for ring saws.

[0006] The purpose of this technical solution is achieved as follows:

[0007] An adjustable saw blade limiting device for a ring saw includes a housing, on the front side of which a ring saw blade can be mounted. The housing has a sliding cavity and includes an adjusting assembly disposed within the sliding cavity. The adjusting assembly includes a sliding block and an adjusting screw disposed on the sliding block. The sliding block slides within the sliding cavity, and the adjusting screw is rotatably disposed relative to the sliding cavity. One end of the adjusting screw passes through the housing, and the screw head of the adjusting screw abuts against the outer wall of the housing. The other end of the adjusting screw is threadedly connected to the sliding block.

[0008] Two swing wheel assemblies are hinged to the housing. The left and right sides of the sliding block are respectively movably connected to the corresponding swing wheel assemblies. The position of the sliding block is adjusted by rotating the adjusting screw. The sliding block drives the swing wheel assemblies on both sides to swing synchronously. The two swing wheel assemblies cooperate to abut against the inner edge of the annular saw blade.

[0009] With the above technical solution, an adjustable saw blade limiting device for a ring saw is used normally. After the selected saw blade is installed in the housing, when the adjusting screw is rotated, the screw only rotates due to the screw head limiting, and drives the sliding block to slide linearly in the sliding cavity through the threaded transmission. The left and right sides of the sliding block are linked to two swing wheel assemblies hinged to the housing through movable connecting structures (such as pins or sliding grooves). When the sliding block moves, it synchronously pulls the swing wheel assemblies on both sides to swing around the hinge point, so that the ends of the two swing wheels always correspond one-to-one with the inner edge of the ring saw blade. By simply rotating the adjusting screw, the opening and closing angle of the swing wheel assemblies on both sides can be synchronously controlled by the linear displacement of the sliding block, which can quickly adapt to the limiting requirements of ring saw blades of different diameters, enhance positioning stability, avoid saw blade wobble, and improve operating efficiency.

[0010] Preferably, the adjusting screw is fitted with an elastic element, the two ends of which abut against the screw head of the adjusting screw and the corresponding side wall of the housing, respectively. The elastic element pushes the adjusting screw to slide, and its elastic force makes the adjusting screw tend to drive the sliding block to move synchronously.

[0011] Through the above technical solution, one end of the elastic element abuts against the screw head of the adjusting screw. The elastic force generated by its compression is transmitted to the sliding block through the adjusting screw, driving the sliding block to slide in the sliding cavity. The movement of the sliding block drives the swing wheel assembly connected to both sides to swing towards the inner edge of the saw blade. During the operation, the saw blade is dynamically maintained in a centered position and radial stability, improving equipment compatibility.

[0012] Preferably, the oscillating wheel assembly includes:

[0013] A swing linkage, one end of which is movably mounted on the sliding block;

[0014] A swing block is fixedly connected to the swing connecting rod. The housing is provided with a hinge post. The swing block and the swing connecting rod are respectively provided with a hinge hole one and a hinge hole two for them to pass through the hinge post.

[0015] A swaying pressure roller is rotatably mounted at the end of the swaying block, and the axis of rotation of the swaying pressure roller is parallel to the hinge axis of the swaying block.

[0016] Through the above technical solution, the sliding block slides and drives the swing linkage. Based on the swing block being hinged to the housing, the swing block can rotate synchronously, so that the swing pressure roller fixed at the end of the swing block always presses against the inner edge of the ring saw blade. The linkage mechanism converts linear displacement into double wheel swing in opposite directions, ensuring that the saw blade is centered and the clamping force is uniform and adaptive. Pure rolling contact is achieved through the swing pressure roller, reducing friction loss and off-center load risk.

[0017] Preferably, the swing block includes a block one and a block two. The swing connecting rod is fixedly connected to the block one. A rotating cavity is formed between the block two and the block one. The swing pressure roller is confined within the rotating cavity. The swing block has a clearance groove that connects the rotating cavity to the outside and allows the side of the annular saw blade to pass through so as to abut against the swing pressure roller.

[0018] Through the above technical solution, block one is fixedly connected to the swing linkage to transmit driving force, and block two and block one enclose the swing pressure roller in the rotating cavity; the side of the annular saw blade is accurately guided into the rotating cavity through the relief groove, and forms a rolling contact with the swing pressure roller. The relief groove accurately guides the contact position of the saw blade to avoid uneven wear; the rotating cavity isolates external contaminants from intrusion, and the split block design facilitates the disassembly and maintenance of the pressure roller, improving clamping reliability and equipment service life.

[0019] Preferably, each of the sliding blocks has a limiting groove near the swing link, and the two limiting grooves are arranged on opposite sides along the sliding direction of the sliding block. Each of the swing links is provided with a limiting pin for embedding into the corresponding limiting groove.

[0020] Through the above technical solution, the limiting pin is embedded in the limiting groove of the sliding block. When the elastic element pushes the sliding block to slide, the limiting pin is pushed by the inner wall of the limiting groove, thereby pulling the swing linkage and driving the swing block fixedly connected to it.

[0021] Preferably, the housing is provided with a cover plate for covering the opening of the sliding cavity.

[0022] Through the above technical solution, the cover plate is installed on the housing to prevent external debris generated by cutting from entering the sliding cavity and to protect the internal parts. The detachable cover plate provides a quick maintenance channel, which is convenient for cleaning the cavity or replacing internal parts.

[0023] Preferably, the housing includes an upper shell and a lower shell detachably connected to the upper shell, and an installation cavity is formed between the upper shell and the lower shell.

[0024] The above technical solution allows for the disassembly of the upper and lower shells, opening the interior of the shell and facilitating the installation of the ring saw blade.

[0025] Preferably, the housing is provided with a second cover plate, which is used to cover the opening of the mounting cavity.

[0026] Through the above technical solution, the cover plate 2 is installed on the housing to prevent external debris generated by cutting from entering the installation cavity and to protect the internal parts.

[0027] Preferably, the housing further includes a driving device, which is installed within the mounting cavity and located between the two swing wheel assemblies. The driving device includes:

[0028] A drive mechanism is disposed on the upper shell. The drive mechanism includes a drive shaft and a drive wheel coaxially fixed to the drive shaft. The drive shaft and the drive wheel are rotatably disposed relative to the upper shell. The drive shaft is used to connect to a drive motor.

[0029] A pressing mechanism is provided in the lower shell. The pressing mechanism includes a connecting seat, a pressing wheel rotatably disposed on the connecting seat, and an elastic pressing component. The rotation axes of the pressing wheel and the drive wheel are parallel to each other. One end of the connecting seat is hinged to the lower shell by a pin, and the other end is provided with the elastic pressing component. The elastic force of the elastic pressing component causes the pressing wheel to tend to press against the annular saw blade. The pressing wheel cooperates with the drive wheel to abut against the opposite sides of the annular saw blade.

[0030] Through the above technical solution, the parallel axes of the drive wheel and the pressure wheel work together to clamp the saw blade. The elastic pressure component makes the pressure wheel press against the other side of the saw blade with constant pressure, automatically compensating for the thickness deviation of the saw blade. This ensures that the two wheels are always in contact with the surface of the saw blade to transmit torque, ensuring that the drive wheel and the pressure wheel maintain full contact throughout the cutting process, ensuring effective driving and reducing slippage, optimizing power transmission efficiency, and improving operational reliability.

[0031] Preferably, the elastic pressure-resistant component includes:

[0032] An adjusting pressure rod is connected to the connecting seat. The end of the adjusting pressure rod has a protruding abutment end, which is used to abut against the lower shell to restrict movement.

[0033] An adjusting spring is sleeved on the adjusting pressure rod;

[0034] An adjusting stop is connected to the end of the adjusting rod away from the abutting end. The two ends of the adjusting spring abut against the inner wall of the lower shell and the corresponding side wall of the connecting seat, respectively. The adjusting spring pushes the connecting seat, and its elastic force causes the connecting seat to tend to move the abutting wheel closer to the driving wheel to abut.

[0035] The above technical solution adjusts the pressure of the spring to push the connecting seat, ensuring that the pressure wheel always tends to move closer to the drive wheel. This design automatically adapts to the saw blade thickness fluctuations through spring force, ensuring a stable and flexible clamping between the pressure wheel and the drive wheel. This eliminates transmission gaps, reduces saw blade stress concentration, and improves driving efficiency and sawing accuracy.

[0036] The key and beneficial technical effects of this technical solution compared to existing technologies are:

[0037] 1. This technical solution uses a rotating adjusting screw to drive a sliding block to slide linearly within the sliding cavity via a threaded transmission. As the sliding block moves, it synchronously pulls the two swing wheel assemblies on both sides to swing around the hinge point, ensuring that the ends of the two swing wheels always correspond one-to-one with the inner edge of the ring saw blade. This allows for quick adaptation to the positioning requirements of ring saw blades of different diameters, enhances positioning stability, prevents saw blade swaying, and improves operational efficiency.

[0038] 2. In this technical solution, an elastic element is fitted onto an adjusting screw. The two ends of the elastic element abut against the screw head of the adjusting screw and the corresponding side wall of the housing, respectively. When the saw blade is working, the elastic force generated by the compression of the elastic element is transmitted to the sliding block through the adjusting screw, which drives the sliding block to slide in the sliding cavity and then drives the swing wheel assembly on both sides to swing and adjust, thereby dynamically maintaining the centered positioning and radial stability of the saw blade during the working process.

[0039] 3. In this technical solution, a limiting groove is provided on both sides of the sliding block along its sliding direction. The limiting pin is embedded in the limiting groove. When the elastic element pushes the sliding block to slide, the limiting pin is pushed by the inner wall of the limiting groove, thereby pulling the swing linkage and driving the swing block fixedly connected to it. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0041] Figure 2 This is a planar view diagram with the cover plate 1 hidden in this embodiment;

[0042] Figure 3 This is a partial explosion diagram of the positioning adjustment device and the housing in the embodiment;

[0043] Figure 4 This is a partial exploded view of the positioning adjustment device in the embodiment;

[0044] Figure 5 This is one of the partial cross-sectional schematic diagrams of this embodiment;

[0045] Figure 6 This is the second partial cross-sectional view of this embodiment;

[0046] Figure 7 This is a schematic diagram of a partial explosion between the upper and lower shells in the embodiment;

[0047] Figure 8 This is an example. Figure 4 Another perspective illustration;

[0048] Figure 9This is a schematic diagram of the usage state when a larger ring saw blade is selected in the embodiment.

[0049] Reference numerals: 1. Housing; 101. Upper housing; 102. Lower housing; 2. Adjustment assembly; 21. Sliding block; 22. Adjusting screw; 23. Elastic element; 3. Swing wheel assembly; 31. Swing connecting rod; 32. Swing block; 321. Block one; 322. Block two; 33. Swing pressure roller; 4. Mounting cavity; 5. Sliding cavity; 6. Limiting groove; 7. Limiting pin; 8. Hinge column; 91. Hinge hole one; 92. Hinge 10. Rotating cavity; 11. Relief groove; 12. Through hole; 141. Cover plate one; 142. Cover plate two; 15. Drive mechanism; 151. Drive shaft; 152. Drive wheel; 16. Pressing mechanism; 161. Connecting seat; 162. Pressing wheel; 163. Elastic pressing assembly; 1631. Adjusting pressure rod; 1632. Adjusting spring; 1633. Adjusting stop; 17. Abutting end; 100. Ring saw blade. Detailed Implementation

[0050] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0051] Example:

[0052] See Figure 1 and Figure 7 An adjustable saw blade limiting device for a ring saw includes a housing 1. A ring saw blade 100 is detachably mounted on the front side of the housing 1. A portion of the arc segment of the ring saw blade 100 passes through the interior of the housing 1, and the ring saw blade 100 rotates relative to the housing 1. The housing 1 includes an upper shell 101 and a lower shell 102, which are detachably connected by bolts. An installation cavity 4 is formed between the upper shell 101 and the lower shell 102. The installation cavity 4 has an opening on the side of the housing 1 where the ring saw blade 100 is mounted. A driving device is installed in the installation cavity 4. In this embodiment, the housing 1 can be equipped with a drive motor, the output end of which passes through the housing 1 and is connected to the drive device. The drive motor drives the ring saw blade 100 to rotate for cutting.

[0053] The housing 1 is provided with a cover plate 142, which is detachably connected to the housing 1 by bolts, and the connection position is set corresponding to the mounting cavity 4, for covering the opening of the mounting cavity 4 and closing it.

[0054] See Figure 6 , Figure 7 and Figure 8The driving device includes a driving mechanism 15 disposed on the upper shell 101 and a pressing mechanism 16 disposed on the lower shell 102. The driving mechanism 15 includes a driving shaft 151 and a driving wheel 152. The driving shaft 151 and the driving wheel 152 are rotatably disposed relative to the upper shell 101. The driving shaft 151 is connected to the output shaft of the driving motor through a transmission assembly. The driving wheel 152 is sleeved on the end of the driving shaft 151 and fixedly connected to it. When the driving shaft 151 is driven to rotate, it drives the driving wheel 152 to rotate synchronously.

[0055] The pressing mechanism 16 includes a connecting seat 161, a pressing wheel 162, and an elastic pressing component 163. The connecting seat 161 is hinged to the lower shell 102. The hinge is achieved by a shaft passing through one end of the connecting seat 161 and the lower shell 102 having shaft holes for both ends of the shaft to pass through. The other end of the connecting seat 161 is provided with the pressure adjusting mechanism, which includes an adjusting rod 1631, an adjusting spring 1632, and an adjusting stop 1633. The end of the adjusting rod 1631 has a protruding abutment end 17. One end of the adjusting rod 1631 passes through the lower shell 102 and the connecting seat 161 in sequence until the abutment end 17 abuts against the lower shell 102 to restrict movement. The adjusting stop 1633 is connected to the end of the adjusting rod 1631 that passes through the connecting seat 161. The other end of the adjusting rod 1631 abuts against the outer wall of the lower shell 102 to cooperate with the adjusting stop 1633 to restrict disengagement from the lower shell 102.

[0056] The adjusting spring 1632 is preferably a return spring, which is sleeved on the adjusting pressure rod 1631. One end of the spring abuts against the inner side wall of the lower shell 102, and the other end abuts against the corresponding end face of the connecting seat 161. The elastic force of the adjusting spring 1632 pushes the connecting seat 161 to rotate around the hinge axis. The pressure wheel 162 is rotatably connected to the connecting wheel, so that the pressure wheel 162 tends to move closer to the drive wheel 152. Since the annular saw blade 100 passes between the pressure wheel 162 and the drive wheel 152, the pressure wheel 162 presses the annular saw blade 100 against the drive wheel 152. The drive wheel 152 rotates and drives the annular saw blade 100 to run.

[0057] See Figure 2 , Figure 3 and Figure 4 The outer side wall of the housing 1 is provided with a sliding cavity 5. The housing 1 is provided with a cover plate 141, the shape and size of which are adapted to the opening of the sliding cavity 5. The cover plate 141 is detachably connected to the housing 1 by bolts, and the connection position is set corresponding to the sliding cavity 5, which is used to cover the sliding cavity 5 and close the opening.

[0058] The housing 1 is provided with an adjustment assembly 2 and two swing wheel assemblies 3. The adjustment assembly 2 includes a sliding block 21, an adjustment screw 22, and an elastic element 23. The sliding block 21 is embedded in the sliding cavity 5 and is slidably connected relative to the housing 1. The housing 1 has a through hole 12 that passes through the front end face of the sliding cavity 5 to the outside. The through hole 12 is adapted to the adjustment screw 22. One end of the adjustment screw 22 is threaded to the sliding block 21, and the other end extends outward through the through hole 12. The extended end has a screw head end that protrudes relative to the adjustment screw 22. The screw head end is preferably a nut and is threadedly connected to the adjustment screw 22. The elastic element 23 is preferably a return spring, which is sleeved on the adjustment screw 22. The two ends of the elastic element 23 abut against the screw head end and the outer wall of the housing 1 corresponding to the through hole 12, respectively. The elastic element 23 abuts against the screw head of the adjustment screw 22, so that it tends to drive the sliding block 21 to slide.

[0059] Each swing wheel assembly 3 includes a swing link 31, a swing block 32, and a swing pressure wheel 33. The swing link 31 is hinged to the housing 1, and a hinge post 8 is provided through the housing 1. The swing link 31 has a hinge hole 92 through which the hinge post 8 passes. Each swing link 31 has a limiting pin 7, which is located at the end of the swing link 31 and protrudes from the end face of the swing link 31 opposite to the swing block 32. The sliding block 21 has limiting grooves 6 on opposite sides along its sliding direction. The two limiting grooves 6 correspond one-to-one with the two positioning pins, so that the positioning pins are embedded in the corresponding limiting grooves 6. The swing block 32 includes a block body. Block 321 and block 322 are connected together. Block 321 is hinged to the housing 1. A hinge hole 91 is provided in block 321 for the hinge shaft to pass through. One side of block 321 is fixedly connected to the swing link 31, and the other side is fixedly connected to block 322 by bolts. In this embodiment, it is shown that block 321 has a positioning hole and the swing link 31 has a positioning post that is embedded in the positioning hole. A rotating cavity 10 is formed between block 322 and block 321. The swing pressure roller 33 is limited to rotating within the rotating cavity 10. The rotation axis of the swing pressure roller 33 is parallel to the hinge axis of the swing block 32.

[0060] The swing block 32 has a clearance groove 11, which connects to the rotating cavity 10 to the outside, allowing the side of the annular saw blade 100 to pass through and abut against the swing pressure roller 33. When the elastic element 23 pushes the sliding block 21 to slide, the sliding block 21 changes position by abutting against the positioning pin through the inner wall of the limiting groove 6. The movement of the positioning pin drives the swing connecting rod 31 to rotate around the hinge post 8. The swing connecting rod 31 drives the swing block 32 to rotate, and the swing block 32 drives the swing pressure roller 33 to rotate. The swing pressure roller 33 is located inside the ring of the annular saw blade 100. Figure 5As shown, the oscillating pressure roller 33 approaches and rolls against the inner side of the ring saw blade 100. When the drive motor drives the ring saw blade 100 to rotate through the drive device, the oscillating pressure rollers 33 on both sides cooperate to guide the rotation of the ring saw blade 100.

[0061] The specific work process of this plan is as follows:

[0062] This technical solution involves selecting a saw blade and installing it in the housing 1. When the adjusting screw 22 is rotated, the screw only rotates due to the screw head limit, and the drive sliding block 21 slides linearly within the sliding cavity 5 through threaded transmission. The left and right sides of the sliding block 21 are linked to two swing wheel assemblies 3 hinged to the housing 1 through movable connecting structures. When the sliding block 21 moves, it synchronously pulls the swing wheel assemblies 3 on both sides to swing around the hinge point, so that the ends of the swing pressure rollers 33 in the two swing wheel assemblies 3 always correspond to and press against the inner edge of the ring saw blade 100. By simply rotating the adjusting screw 22, the opening and closing angles of the swing pressure rollers 33 on both sides can be synchronously controlled by the linear displacement of the sliding block 21, which can quickly adapt to the limiting requirements of ring saw blades of different diameters, enhance positioning stability, avoid saw blade wobble, and improve operating efficiency.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

Claims

1. An adjustable saw blade limiting device for a ring saw, comprising a housing (1), wherein a ring saw blade (100) can be mounted on the front side of the housing (1), and the housing (1) has a sliding cavity (5), characterized in that, Also includes: An adjustment assembly (2) is disposed in the sliding cavity (5). The adjustment assembly (2) includes a sliding block (21) and an adjustment screw (22) disposed in the sliding block (21). The sliding block (21) slides in the sliding cavity (5). The adjustment screw (22) is rotatably disposed relative to the sliding cavity (5). One end of the adjustment screw (22) passes through the housing (1). The screw head of the adjustment screw (22) abuts against the outer wall of the housing (1). The other end of the adjustment screw (22) is threadedly connected to the sliding block (21). Two swing wheel assemblies (3) are hinged to the housing (1). The left and right sides of the sliding block (21) are respectively movably connected to the corresponding swing wheel assemblies (3). The position of the sliding block (21) is adjusted by rotating the adjusting screw (22). The sliding block (21) drives the swing wheel assemblies (3) on both sides to swing synchronously. The two swing wheel assemblies (3) cooperate to abut against the inner edge of the ring saw blade (100) in a one-to-one correspondence.

2. The adjustable saw blade limiting device for a ring saw according to claim 1, characterized in that: The adjusting screw (22) is fitted with an elastic element (23). The two ends of the elastic element (23) abut against the screw head of the adjusting screw (22) and the corresponding side wall of the housing (1), respectively. The elastic element (23) pushes the adjusting screw (22) to slide, and its elastic force makes the adjusting screw (22) tend to drive the sliding block (21) to move synchronously.

3. The adjustable saw blade limiting device for a ring saw according to claim 1, characterized in that: The oscillating wheel assembly (3) includes: A swing link (31) is movably mounted on the sliding block (21) at one end; The swing block (32) is fixedly connected to the swing connecting rod (31). The housing (1) is provided with a hinge post (8). The swing block (32) and the swing connecting rod (31) are respectively provided with a hinge hole one (91) and a hinge hole two (92) for them to pass through the hinge post (8). A swing pressure roller (33) is rotatably mounted at the end of the swing block (32), and the rotation axis of the swing pressure roller (33) is parallel to the hinge axis of the swing block (32).

4. The adjustable saw blade limiting device for a ring saw according to claim 3, characterized in that: The swing block (32) includes a block one (321) and a block two (322). The swing connecting rod (31) is fixedly connected to the block one (321). A rotating cavity (10) is formed between the block two (322) and the block one (321). The swing pressure roller (33) is confined in the rotating cavity (10). The swing block (32) has a relief groove (11). The relief groove (11) connects the rotating cavity (10) to the outside and is used to allow the side of the annular saw blade (100) to pass through so as to achieve contact with the swing pressure roller (33).

5. The adjustable saw blade limiting device for a ring saw according to claim 1, characterized in that: Each sliding block (21) has a limiting groove (6) near the swing link (31). The two limiting grooves (6) are arranged on opposite sides along the sliding direction of the sliding block (21). Each swing link (31) is provided with a limiting pin (7) for embedding into the corresponding limiting groove (6).

6. The adjustable saw blade limiting device for a ring saw according to claim 1, characterized in that: The housing (1) is provided with a cover plate (141) for covering the opening of the sliding cavity (5).

7. The adjustable saw blade limiting device for a ring saw according to claim 1, characterized in that: The housing (1) includes an upper shell (101) and a lower shell (102) detachably connected to the upper shell (101), and an installation cavity (4) is formed between the upper shell (101) and the lower shell (102).

8. The adjustable saw blade limiting device for a ring saw according to claim 7, characterized in that: The housing (1) is provided with a cover plate (142) for covering the opening of the mounting cavity (4).

9. The adjustable saw blade limiting device for a ring saw according to claim 7, characterized in that: The housing (1) is further provided with a driving device, which is installed in the mounting cavity (4) and located between the two swing wheel assemblies (3). The driving device includes: A drive mechanism (15) is disposed on the upper shell (101). The drive mechanism (15) includes a drive shaft (151) and a drive wheel (152) coaxially fixed to the drive shaft (151). The drive shaft (151) and the drive wheel (152) are rotatably disposed relative to the upper shell (101). The drive shaft (151) is used to connect to a drive motor. A pressing mechanism (16) is disposed on the lower shell (102). The pressing mechanism (16) includes a connecting seat (161), a pressing wheel (162) rotatably disposed on the connecting seat (161), and an elastic pressing component (163). The rotating axes of the pressing wheel (162) and the driving wheel (152) are parallel to each other. One end of the connecting seat (161) is hinged to the lower shell (102) by a pin, and the other end is provided with the elastic pressing component (163). The elastic force of the elastic pressing component (163) makes the pressing wheel (162) tend to press against the annular saw blade (100). The pressing wheel (162) and the driving wheel (152) cooperate to abut against the opposite sides of the annular saw blade (100).

10. An adjustable saw blade limiting device for a ring saw according to claim 9, characterized in that: The elastic pressure-resistant component (163) includes: An adjusting pressure rod (1631) is connected to the connecting seat (161). The end of the adjusting pressure rod (1631) has a protruding abutment end (17) which is used to abut against the lower shell (102) to restrict movement. An adjusting spring (1632) is sleeved on the adjusting pressure rod (1631); An adjusting stop (1633) is connected to the end of the adjusting rod (1631) away from the abutting end (17). The two ends of the adjusting spring (1632) abut against the inner wall of the lower shell (102) and the corresponding side wall of the connecting seat (161), respectively. The adjusting spring (1632) pushes the connecting seat (161), and its elastic force makes the connecting seat (161) tend to drive the abutting wheel (162) to move closer to the drive wheel (152) and abut.

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