Rotary limiting device and rectangular pipe positioning tool

Abstract

The utility model provides a rotary limiting device and a rectangular pipe positioning tool, and belongs to the technical field of workpiece limiting devices. The rotating limiting device comprises a supporting seat and a rotating frame, supporting rollers distributed along the circumference are installed on the supporting seat, the rotating frame is erected on the supporting rollers in a rolling mode, the supporting seat is provided with two supporting plates which shield the two ends of the rotating frame respectively, and each supporting plate is provided with a plurality of rolling supporting assemblies which abut against the end face of the rotating frame in a rolling mode; the rectangular pipe is arranged on the rotating frame and rotates along with the rotating frame to adjust the direction, the rotating frame is only in rolling friction with the outside in the rotating process, rotation is smooth, abrasion consumption is reduced, the two ends of the rotating frame can be more fully shielded by the supporting plates, and the rotating frame is prevented from falling off. The rectangular pipe positioning tool comprises at least two sets of rotary limiting devices arranged on the sliding rails in a sliding mode, alignment of the axes of the at least two sets of rotary limiting devices is guaranteed through the sliding rails, and the alignment difficulty is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of workpiece limiting devices, and more specifically, it relates to a rotary limiting device and a rectangular tube positioning fixture. Background Art

[0002] For rectangular tubes with irregular cross-sections, it is sometimes necessary to process multiple sides, which requires repeated clamping and positioning on the tooling, making the operation quite cumbersome.

[0003] To address the aforementioned issues, Chinese utility model patent CN218081244U discloses a rotation limiting device and a rectangular tube positioning fixture. The patent design includes a cylindrical rotating frame with a limiting groove for placing a rectangular tube. By placing the rectangular tube in the limiting groove and mounting the rotating frame on a support base with supporting rollers, the rotating frame rotates on the rollers, thus adjusting the orientation of the rectangular tube. In this design, to prevent the rotating frame from sliding laterally off the supporting rollers, a front and rear baffle are provided on both sides of the rotating base, and a front and rear baffle are provided on both sides of the rotating top frame. During rotation, the front and rear baffles of the base, as well as the front and rear baffles of the top frame, block the ends of the supporting rollers, preventing axial slippage of the rotating frame.

[0004] However, the above solution still has certain drawbacks, specifically:

[0005] 1. For the base frame front baffle, base frame rear baffle, top frame front baffle and top frame rear baffle, they will directly contact the end face of the support rollers and generate sliding friction with the end face of the support rollers during the rotation of the rotating frame. The rotation resistance is large, and after long-term use, wear and even gaps may appear, causing axial runout of the rotating frame and affecting the positioning accuracy.

[0006] 2. If the actual straightness of the base frame front baffle, base frame rear baffle, top frame front baffle, and top frame rear baffle is not ideal or the rigidity is weak, the rotating frame may tilt, causing the rotating frame to jam and unable to rotate.

[0007] 3. The rotating frame may jump vertically and detach from the supporting rollers, causing the rotating frame to fall off;

[0008] 4. Because rectangular tube beams are usually quite heavy, the impact between them and the tooling is significant when they are hoisted into the limiting groove, which can easily damage the tooling and the rectangular tube.

[0009] 5. In the aforementioned disclosed patent, in order to fix the orientation of the rotating frame, the outer circular guide rail surface of the rotating frame has a positioning groove, and the position is fixed by a positioning plate. However, the setting of the positioning groove causes the outer circular guide rail surface to be discontinuous, resulting in uneven operation and jamming during rotation. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this utility model provides a rotation limiting device and a rectangular tube positioning fixture, which ensures positioning accuracy, prevents the rotating frame from jamming, getting stuck, or falling off, and reduces the chance of damage to the fixture or rectangular tube during hoisting.

[0011] To achieve the above objectives, on the one hand, the technical solution of this application provides a rotation limiting device, including a support base and a rotating frame. The support base is equipped with a plurality of support rollers distributed along the circumference. The rotating frame is rolled on the plurality of support rollers. A rectangular limiting groove for placing a rectangular tube is provided at the center of the rotating frame. An anti-rotation component is provided between the support base and the rotating frame to limit the rotation of the rotating frame.

[0012] The support base is also equipped with two support plates that respectively shield both ends of the rotating frame. Both support plates have openings to allow the rectangular tube to pass through. Each support plate is equipped with several rolling support components that roll against the end face of the rotating frame. Because the outer surface of the rotating frame only contacts the support rollers, and the end face of the rotating frame only rolls against the rolling support components, the rotating frame only experiences rolling friction with the outside during rotation, without generating sliding friction. This results in smoother rotation, greatly reducing wear and tear, reducing accuracy deviations caused by wear, and extending the equipment's lifespan.

[0013] Optionally, the rolling support assembly includes balls and roller supports. The outer wall of the roller support is provided with a first external thread, and the roller support is screwed through and installed on the support plate via the first external thread. A cavity is provided at the end of the roller support near the rotating frame, and the balls are placed in the cavity and can rotate. The ball portion extends out of the cavity and abuts against the rotating frame. By rotating the fine-tuning roller support, the orientation of the rotating frame can be finely adjusted, improving positioning accuracy and preventing the rotating frame from tilting and locking up. It also reduces the flatness requirements of the support plate and the end face of the rotating frame. At the same time, the clamping degree of the rotating frame can also be adjusted by rotating the roller support, making it easy to adapt to different working conditions.

[0014] Optionally, the rolling support assembly also includes an grease nipple, which is installed at the end of the roller support away from the roller. The roller support has an internal oil inlet channel connecting the grease nipple and the mold cavity. Lubricating oil or grease is added through the grease nipple, and the lubricating oil or grease enters the mold cavity through the oil inlet channel to ensure smooth rotation of the roller.

[0015] Optionally, the support rollers include two sets of top rollers and two sets of bottom rollers. The two sets of bottom rollers are located on the bottom side of the axis of the rotating frame, and are positioned on either side of the vertical centerline of the rotating frame. The two sets of top rollers are located on the top side of the axis of the rotating frame, and are positioned on either side of the vertical centerline of the rotating frame. The rotating frame is confined between the top and bottom rollers, preventing both lateral displacement and vertical jump. The rotating frame is completely confined within the circumference formed by the support rollers, ensuring its stability.

[0016] Optionally, it also includes a buffer support assembly, which includes an elastic support member and a bottom pad located on the top side of the bottom wall of the rectangular limiting groove. The bottom pad is movably connected to the bottom wall of the rectangular limiting groove through the elastic support member. After the rectangular tube is hoisted into the rectangular limiting groove, it contacts the bottom pad. The elastic support member deforms to allow the bottom pad to move vertically, reducing the impact between the rectangular tube and the bottom pad and preventing damage to the rectangular tube or the entire tooling due to collisions.

[0017] Optionally, the buffer support assembly further includes a support column with a second external thread at its bottom end. The support column is screwed into the bottom wall of the rectangular limiting groove via the second external thread. The elastic support is a spring, which is sleeved on the outside of the support column. The bottom end of the spring is connected to the support column, and the top end of the spring extends beyond the top end of the support column and is fixedly connected to the bottom wall of the bottom pad. The top end of the support column has a polygonal inner hole, and the bottom pad has an adjustment through hole aligned with the polygonal inner hole. A wrench with a polygonal head corresponding to the polygonal inner hole can extend into the polygonal inner hole through the adjustment through hole. By rotating the support column, the height position of the support column can be adjusted, thereby adjusting the maximum compression of the spring and adjusting the spring's support force on the bottom pad, thus changing the buffering effect.

[0018] Optionally, the anti-rotation component is a anti-rotation pin. Both support plates have first anti-rotation holes, which are positioned opposite each other. The end face of the rotating frame has several second anti-rotation holes arranged around its axis. Any second anti-rotation hole can be rotated to align with a first anti-rotation hole. The anti-rotation pin passes through the first anti-rotation holes and the second anti-rotation holes aligned with them to fix the rotating frame. Because the second anti-rotation holes are located on the end face of the rotating frame, there is no need to provide positioning grooves or other structures on the outer surface of the rotating frame. The outer surface of the rotating frame is a smooth circle, making the rotation of the rotating frame smoother.

[0019] Optionally, the rotating frame also includes a top clamping bolt and a side clamping bolt. The top clamping bolt screws in from the outside through the top wall of the rectangular limiting groove, and the side clamping bolts screw in from the outside through the side wall of the rectangular limiting groove. The ends of the top clamping bolts and the side clamping bolts extending into the rectangular limiting groove are both extrusion ends for abutting against the rectangular tube. After the rectangular tube is placed into the rectangular limiting groove, rotating the top clamping bolts and the side clamping bolts clamps and fixes the rectangular tube in place to prevent it from shaking.

[0020] Optionally, the rotating frame includes a top support and a bottom support. A rectangular limiting groove is located on the bottom support, and the top support is closably connected to the top of the bottom support to allow the top wall of the rectangular limiting groove to open and close. When the top support is open, the rectangular tube can be placed in the rectangular limiting groove by means of hoisting without needing to be inserted from the side of the rectangular limiting groove, making the placement of the rectangular tube more convenient.

[0021] Optionally, the rotating frame also includes a hinge and a locking bolt; the two ends of the hinge are respectively provided with a top hinge shaft and a bottom hinge shaft, the hinge is rotatably connected to the top bracket through the top hinge shaft, and the hinge is rotatably connected to the bottom bracket through the bottom hinge shaft; the top bracket and the bottom bracket are rotatably connected to each other through the hinge, realizing the opening and locking of the two.

[0022] The top bracket has a bolt notch, and the bottom bracket has a locking screw hole aligned with the bolt notch. The locking bolt passes through the bolt notch and screws into the locking screw hole, with the bolt head supported by the side edge of the bolt notch. This achieves the fixation of the top and bottom brackets. The structure is simple and easy to operate.

[0023] Optionally, the top bracket includes a top arc-shaped pad welded to and fixedly connected to both sides of the top weld, and the bottom bracket includes a bottom arc-shaped pad welded to and fixedly connected to both sides of the bottom weld. A rectangular limiting groove is located at the bottom weld. The bottom edge height of the top arc-shaped pad is higher or lower than the bottom edge height of the top weld, and correspondingly, the bottom edge height of the bottom arc-shaped pad is lower or higher than the bottom edge height of the bottom weld. The bottom edge of the top arc-shaped pad, the top edge of the bottom arc-shaped pad, the bottom edge of the top weld, and the top edge of the bottom weld are coupled to each other. In this case, when the top bracket and the bottom bracket are engaged, the contact between them is not a simple surface contact, but rather an interlocking, ensuring accurate alignment of the top bracket and the bottom bracket.

[0024] Optionally, the support base includes a U-shaped frame body, with the support rollers and rotating frame located inside the frame body. Two support plates are bolted to both sides of the frame body. The support rollers include a roller body and an axle, with the axle mounted between the two support plates. Both ends of the axle are bolted to the two support plates, and the roller body is rotatably sleeved on the outside of the axle. The rotating frame is mounted on the roller body. In this configuration, the rotating frame is confined within the cavity defined by the support base and the two support plates, ensuring that the rotating frame will not detach from the support base. Furthermore, only one support plate needs to be removed to fully expose the rotating frame and support rollers, facilitating maintenance and replacement.

[0025] On the other hand, the technical solution of this application provides a rectangular tube positioning fixture, including a base, a slide rail, and at least two sets of rotation limiting devices as described in any one of the above. The slide rail is mounted on the base, and each set of rotation limiting devices has a support seat with a slider installed at the bottom of the support seat. All rotation limiting devices are slidably mounted on the slide rail via the slider and are arranged at intervals along the extension direction of the slide rail, with the axes of all rotation limiting devices coinciding with each other. Since all rotation limiting devices are confined on the slide rail, it is easier to align the axes of multiple sets of rotation limiting devices.

[0026] The advantages of the technical solution in this application compared to the prior art are as follows:

[0027] In the rotary limiting device, a rectangular limiting groove is used to place a rectangular tube, which is clamped and fixed by clamping components. The rotating frame adjusts the direction of the rectangular tube by rolling on the support base. Once the direction of the rectangular tube is determined, the position of the rotating frame is fixed by an anti-rotation component, facilitating the processing of the rectangular tube. The rectangular tube does not require repeated clamping during processing, improving processing efficiency. Because the outer surface of the rotating frame only contacts the support rollers, and the end face of the rotating frame only rolls against the rolling support components, the rotating frame experiences only rolling friction during rotation, eliminating sliding friction. This results in smoother rotation, significantly reducing wear and tear, minimizing accuracy deviations caused by wear, and extending equipment lifespan. Simultaneously, since the support plate only needs to avoid the rectangular limiting groove, it can more effectively shield both ends of the rotating frame, making it difficult for the rotating frame to detach from the support rollers, ensuring the reliability and safety of the equipment. The number and position of the rolling support components can also be arranged more flexibly to ensure effective support. In the rectangular tube positioning fixture, since at least two sets of rotation limiting devices slide on the slide rail, the rotation limiting devices ensure the alignment of the axis under the restriction of the slide rail, reducing the difficulty of alignment. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a front view of the rotation limiting device;

[0030] Figure 2 This is a side view of the rotation limiting device;

[0031] Figure 3 for Figure 2 Sectional view at point AA;

[0032] Figure 4 for Figure 1 Sectional view at point BB;

[0033] Figure 5 for Figure 4 Enlarged view of a portion of point A in the middle;

[0034] Figure 6 A schematic diagram of the rotation limiting device when the top support is open;

[0035] Figure 7 This is a schematic diagram of the top support structure;

[0036] Figure 8 This is a schematic diagram of the bottom support structure;

[0037] Figure 9 This is a schematic diagram of the hinge structure;

[0038] Figure 10 This is a schematic diagram of the locking mechanism.

[0039] Figure 11 for Figure 4 Enlarged view of a section at point B in the middle;

[0040] Figure 12 for Figure 3 Enlarged view of a section at point C;

[0041] Figure 13 for Figure 1 Sectional view at CC;

[0042] Figure 14 A schematic diagram of a rectangular tube positioning fixture structure.

[0043] Icons: 1. Support base; 101. Support roller; 102. Support plate; 103. Through-hole; 104. Top roller; 105. Bottom roller; 106. Frame body; 107. Frame welding; 108. Roller body; 109. Axle; 110. First anti-rotation hole; 2. Rotating frame; 201. Rectangular limiting groove; 202. Top bracket; 203. Bottom bracket; 204. Hinge; 205. Locking bolt; 206. Top welding; 207. Top arc pad; 208. Bottom welding; 209. Bottom arc pad; 210. Top hinge shaft; 211. Bottom hinge shaft; 212. 213. Bolt notch; 214. Locking screw hole; 215. Top clamping bolt; 216. Side clamping bolt; 217. Buffer support assembly; 218. Bottom pad; 219. Support column; 220. Spring; 221. Step; 222. Second external thread; 222. Polygonal inner hole; 223. Adjustment through hole; 224. Second anti-rotation hole; 225. Locking element; 3. Rolling support assembly; 301. Ball bearing; 302. Roller support; 303. Oil nozzle; 304. First external thread; 305. Cavity; 306. Oil inlet channel; 4. Anti-rotation pin; 501. Base; 502. Slide rail; 503. Slider. DETAILED DESCRIPTION

[0044] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0045] Example 1:

[0046] This embodiment provides a rotation limiting device. Figures 1 to 3 As shown, the system includes a support base 1 and a rotating frame 2. The support base 1 is equipped with several support rollers 101 distributed circumferentially. These support rollers 101 represent at least two sets of support rollers 101. The rotating frame 2 is mounted on the support rollers 101. A rectangular limiting groove 201 for placing a rectangular tube is provided at the center of the rotating frame 2. An anti-rotation component is provided between the support base 1 and the rotating frame 2 to restrict its rotation. The rotating frame 2 adjusts the direction of the rectangular tube by rolling on the support base 1. Once the direction of the rectangular tube is determined, the anti-rotation component fixes the position of the rotating frame 2, facilitating the processing of the rectangular tube. During processing, the rectangular tube does not require repeated clamping and orientation adjustments, improving processing efficiency.

[0047] Based on the above structure, Figures 1 to 5As shown, the support base 1 is also equipped with two support plates 102 that respectively shield both ends of the rotating frame 2. Both support plates 102 have openings 103 to avoid interference with the rectangular tube. Each support plate 102 is provided with several rolling support components 3 that roll against the end face of the rotating frame 2. In this embodiment, each support plate 102 has thirteen sets of rolling support components 3, distributed on the same circumference with the rotation axis of the rotating frame 2 as the center. The rolling support components 3 on the two support plates 102 clamp the rotating frame 2 to prevent axial displacement. Since the outer surface of the rotating frame 2 only contacts the support roller 101, and the end face of the rotating frame 2 only rolls against the rolling support components 3, the rotating frame 2 only experiences rolling friction with the outside during rotation, without sliding friction. This results in smoother rotation, greatly reducing wear and tear, reducing accuracy deviations caused by wear, and extending the equipment's lifespan. Meanwhile, since the arrangement of the support plate 102 only needs to avoid the rectangular limiting groove 201, the support plate 102 can more fully cover both ends of the rotating frame 2, making it difficult for the rotating frame 2 to jump and fall off the support roller 101, thus ensuring the reliability and safety of the equipment. The number and support position of the rolling support components 3 can also be arranged more flexibly, ensuring the support effect.

[0048] It should be noted that the number of rolling support components on each support plate 102 can be adjusted according to the actual situation such as the size of the rotating frame 2 and the clamping stability. For example, it can be set to ten or twelve sets. At the same time, the position of the rolling support components 3 is not strictly required to be on the same circumference. They can also be set on multiple circumferences at different distances from the axis of the rotating frame 2, or only on one side of the axis. As long as the stability of the support is guaranteed, those skilled in the art can design it reasonably according to the actual situation.

[0049] Furthermore, based on Figure 5As shown, the rolling support assembly 3 includes a ball bearing 301 and a roller support 302. The outer wall of the roller support 302 is provided with a first external thread 304. The roller support 302 is screwed through the first external thread 304 and installed on the support plate 102. At this time, the two ends of the roller support 302 are located on both sides of the support plate 102. A cavity 305 is provided at the end of the roller support 302 near the rotating frame 2. The ball bearing 301 is placed in the cavity 305 and can rotate. A portion of the ball bearing 301 extends out of the cavity 305 and abuts against the rotating frame 2. The rolling support assembly 3 achieves rolling support with the end of the rotating frame 2 through the ball bearing 301. Rotating the end of the roller support 302 away from the rotating frame 2 allows adjustment of the distance the ball bearing 301 extends out of the support plate 102 under the action of the first external thread 304. The orientation of the rotating frame 2 can be finely adjusted by rotating and finely adjusting multiple sets of rolling support components 3, preventing the rotating frame 2 from tilting and locking up. This also reduces the requirements for the flatness of the support plate 102 and the end face of the rotating frame 2; uneven areas are adjusted using the rotating roller support 302. The clamping degree of the rotating frame 2 can also be adjusted by rotating the roller support 302, making it suitable for different working conditions. To facilitate rotation of the roller support 302 using tools such as wrenches, an external hexagonal shape can be provided at the end of the roller support 302 furthest from the roller.

[0050] Furthermore, based on Figure 5 As shown, the rolling support assembly 3 also includes an oil nozzle 303, which is installed at the end of the roller support 302 away from the roller. Specifically, it can be installed via a threaded connection, welding, or integral machining. The roller support 302 has an internal oil inlet channel 306 connecting the oil nozzle 303 and the cavity 305. During use, lubricating oil or grease can be added through the oil nozzle 303. The lubricating oil or grease enters the cavity 305 through the oil inlet channel 306 to ensure smooth roller rotation.

[0051] Furthermore, based on Figure 3 As shown, the support rollers 101 include two sets of top rollers 104 and two sets of bottom rollers 105. Both sets of bottom rollers 105 are located on the bottom side of the axis of the rotating frame 2, and are respectively located on both sides of the vertical centerline of the rotating frame 2 (i.e., attached). Figure 3The rotating frame 2 is supported by two bottom rollers 105 on both sides of the rotating frame 2, which also restrict its lateral movement. In this embodiment, there are two bottom rollers 105 in each group. Of course, the number of bottom rollers 105 in each group can also be set to one or three, etc., and those skilled in the art can design it reasonably according to the size and weight of the rotating frame 2. At the same time, the two sets of top rollers 104 are located on the top side of the axis of the rotating frame 2, and the two sets of top rollers 104 are located on both sides of the vertical center line of the rotating frame 2. Since the distance between the two sets of top rollers 104 is less than the diameter of the rotating frame 2, the rotating frame 2 can be clamped between the top rollers 104 and the bottom rollers 105, which can prevent the lateral displacement of the rotating frame 2 and also prevent the vertical jump of the rotating frame 2. The rotating frame 2 is completely confined within the circumference formed by the supporting rollers 101, which ensures the stability of the rotating frame 2. Since the top rollers 104 do not bear the weight of the rotating frame 2, in this embodiment, there is only one top roller 104 in each group. Of course, the number of top rollers 104 in each group can also be set to two or three, etc., to ensure that they can withstand greater impacts.

[0052] Furthermore, based on Figure 3 and Figure 12 As shown, it also includes a buffer support assembly 216, which includes an elastic support member and a bottom pad 217 located on the top side of the bottom wall of the rectangular limiting groove 201. The bottom pad 217 is movably connected to the bottom wall of the rectangular limiting groove 201 through the elastic support member. After the rectangular tube is hoisted into the rectangular limiting groove 201, it comes into contact with the bottom pad 217. The elastic support member deforms to allow the bottom pad 217 to move vertically, reducing the impact between the rectangular tube and the bottom pad 217 and preventing damage to the rectangular tube or the entire tooling due to collisions.

[0053] Specifically, the buffer support assembly 216 also includes a support column 218. The bottom end of the support column 218 is provided with a second external thread 221, and the support column 218 is screwed into the bottom wall of the rectangular limiting groove 201 through the second external thread 221. The elastic support is a spring 219, which is sleeved on the outside of the support column 218, and the bottom end of the spring 219 is connected to the support column 218. A step 220 can be provided on the outer wall of the support column 218, and the bottom end of the spring 219 abuts against the top edge of the step 220. Alternatively, the bottom end of the spring 219 can be directly welded or bonded to the outer wall of the support column 218. The top end of the spring 219 extends beyond the top end of the support column 218 and is fixedly connected to the bottom wall of the bottom pad 217. In use, the rectangular tube is hoisted into the rectangular limiting groove 201 and placed on the bottom pad 217. Gravity causes the bottom pad 217 to slide downwards, compressing the spring 219. When the top of the support column 218 is completely embedded in the bottom wall of the rectangular limiting groove 201, the bottom pad 217 will slide downwards until it contacts the bottom wall of the rectangular limiting groove 201 and stops. When the top part of the support column 218 is exposed outside the bottom wall of the rectangular limiting groove 201, the bottom pad 217 will slide downwards until it contacts the top of the support column 218 and stops. The top of the support column 218 has a polygonal inner hole 222, which can be an internal hexagonal hole or a triangular hole, etc. The bottom pad 217 has an adjustment through hole 223 aligned with the polygonal inner hole 222. A wrench with a hexagonal head or a triangular head corresponding to the polygonal head can pass through the adjustment through hole 223 and extend into the polygonal inner hole 222, and adjust the height position of the support column 218 by rotation to adjust the maximum compression of the spring 219, adjust the supporting force of the spring 219 on the bottom pad 217, and change the buffering effect.

[0054] Furthermore, based on Figure 1 , Figure 3 and Figure 13As shown, the anti-rotation component is the anti-rotation pin 4. Both support plates 102 have first anti-rotation holes 110, which are positioned opposite each other. The end face of the rotating frame 2 has several second anti-rotation holes 224 arranged around its axis. In this embodiment, there are four second anti-rotation holes 224, spaced 90 degrees apart. Three of the second anti-rotation holes 224 are located on the bottom support 203, and the fourth is located on the top support 202. Of course, the number of second anti-rotation holes 224 can also be set to six or eight, depending on the actual processing orientation. Any second anti-rotation hole 224 can be rotated and aligned with the first anti-rotation hole 110. When the rotating frame 2 rotates the rectangular tube to a suitable position, the anti-rotation pin 4 passes through the first anti-rotation hole 110 and the second anti-rotation hole 224 aligned with it to fix the rotating frame 2, facilitating operations such as beveling or welding. To facilitate the insertion and removal of the anti-rotation pin 4, one end of the anti-rotation pin 4 can be set in an L-shape or a T-shape.

[0055] Furthermore, based on Figure 3 and Figure 6 As shown, the rotating frame 2 also includes a top clamping bolt 214 and a side clamping bolt 215. The side clamping bolt 215 screws in from the outside through the side wall of the rectangular limiting groove 201. The ends of the top clamping bolt 214 and the side clamping bolt 215 extending into the rectangular limiting groove 201 are both extrusion ends for abutting against the rectangular tube. When the rectangular tube is placed into the rectangular limiting groove 201, rotating the top clamping bolt 214 and the side clamping bolt 215 clamps and fixes the rectangular tube, preventing it from shaking.

[0056] Furthermore, based on Figure 6 As shown, the rotating frame 2 includes a top support 202 and a bottom support 203. A rectangular limiting groove 201 is located on the bottom support 203. The top support 202 is closably connected to the top of the bottom support 203 to allow the top wall of the rectangular limiting groove 201 to open and close. When the top support 202 is open, a rectangular tube can be placed in the rectangular limiting groove 201 by hoisting, without needing to be inserted from the side of the rectangular limiting groove 201, making the placement of the rectangular tube more convenient.

[0057] In detail, based on Figures 6 to 11As shown, the rotating frame 2 also includes a hinge 204 and a locking bolt 205. The hinge 204 has a top hinge shaft 210 and a bottom hinge shaft 211 at its two ends. The hinge 204 is rotatably connected to the top support 202 via the top hinge shaft 210, and rotatably connected to the bottom support 203 via the bottom hinge shaft 211. The top support 202 and the bottom support 203 are rotatably connected to each other via the hinge 204, thereby enabling the opening and closing of the top of the rectangular limiting groove 201.

[0058] The top bracket 202 has a bolt notch 212, and the bottom bracket 203 has a locking screw hole 213 aligned with the bolt notch 212. A locking bolt 205 passes through the bolt notch 212 and is screwed into the locking screw hole 213. The bolt head of the locking bolt 205 is supported by the side edge of the bolt notch 212. This secures the top bracket 202 and the bottom bracket 203. The structure is simple and easy to operate. In this embodiment, the bottom bracket 203 has an inverted T-shaped locking member 225. Both ends of the locking member 225 are bolted to the inner wall of the bottom bracket 203, and the locking screw hole 213 is located at the top of the locking member 225.

[0059] Furthermore, based on Figure 6 , Figure 7 , Figure 8 and Figure 11 As shown, the top support 202 includes a top weld 206 and top arc-shaped pads 207 fixedly connected to both sides of the top weld 206. The bottom support 203 includes a bottom weld 208 and bottom arc-shaped pads 209 fixedly connected to both sides of the bottom weld 208. A rectangular limiting groove 201 is located at the bottom weld 208. In use, the rolling support assembly 3 rolls against the top arc-shaped pads 207 and the bottom arc-shaped pads 209, or the rolling support assembly 3 can also abut against either the top weld 206 or the bottom weld 208, without limitation. The support roller 101 can abut against the outer circumference of the top arc-shaped pads 207 and the bottom arc-shaped pads 209, or against the outer circumference of the top weld 206 and the bottom weld 208, or simultaneously, without limitation. The bottom edge of the top arc pad 207 is higher or lower than the bottom edge of the top weld 206, and correspondingly, the bottom edge of the bottom arc pad 209 is higher or lower than the bottom edge of the bottom weld 208. The bottom edges of the top arc pad 207, the top edges of the bottom arc pad 209, the bottom edges of the top weld 206, and the top edges of the bottom weld 208 are coupled to each other.

[0060] Specifically, in this embodiment, based on Figure 7 , Figure 8 and Figure 11As shown, the bottom edge of the top arc pad 207 extends beyond the bottom edge of the top weld 206, and the top edge of the bottom weld 208 extends beyond the top edge of the bottom arc pad 209. The distance by which the bottom edge of the top arc pad 207 extends beyond the bottom edge of the top weld 206 is equal to the distance by which the top edge of the bottom weld 208 extends beyond the top edge of the bottom arc pad 209. When the top bracket 202 and the bottom bracket 203 are engaged, the bottom edges of the top arc pad 207, the top weld 206, the top edge of the bottom arc pad 209, and the top edge of the bottom weld 208 are staggered and interlocked. Therefore, when the top bracket 202 and the bottom bracket 203 are engaged, the contact is not a simple surface contact, but rather an interlocking process, ensuring accurate alignment of the top bracket 202 and the bottom bracket 203 and preventing axial movement between them.

[0061] Of course, in other embodiments, the opposite can also be true: the bottom edge of the top weld 206 extends beyond the bottom edge of the top arc pad 207, and the top edge of the bottom arc pad 209 extends beyond the top edge of the bottom weld 208. The bottom edges of the top arc pad 207, the bottom edge of the top weld 206, the top edge of the bottom arc pad 209, and the top edge of the bottom weld 208 are staggered and coupled to each other, achieving the same effect.

[0062] Furthermore, based on Figure 3 As shown, the support base 1 includes a frame body 106 assembled into a "U" shape, with the support roller 101 and the rotating frame 2 located inside the frame body 106. A frame weld 107 is provided at the inner corner of the frame body 106 to ensure the strength of the support base 1. Two support plates 102 are bolted to both sides of the frame body 106. The support roller 101 includes a roller body 108 and an axle 109. The axle 109 is mounted between the two support plates 102, with both ends bolted to the two support plates 102. The roller body 108 is rotatably sleeved on the outside of the axle 109, and the outer surface of the rotating frame 2 is mounted on the roller body 108. At this time, the rotating frame 2 is confined within the cavity defined by the support base 1 and the two support plates 102, ensuring that the rotating frame 2 will not detach from the support base 1. At the same time, by simply removing one of the support plates 102, the rotating frame 2 and the support rollers 101 can be fully exposed, making maintenance and replacement easier.

[0063] In this embodiment, a lifting lug may be provided on the top of the frame body 106 to facilitate the transfer of the rotation limiting device.

[0064] Example 2:

[0065] This embodiment provides a rotation limiting device, which differs from the solution in Embodiment 1 in that the rotating frame 2 is a single integral structure, not divided into a top support 202 or a bottom support 203, or it can be described as the top support 202 and the bottom support 203 being an integral structure. In this case, the top support 202 cannot detach from the bottom support 203, and the top of the rectangular limiting groove 201 cannot be opened.

[0066] In use, the rectangular tube needs to be inserted into the rectangular limiting groove 201 from the end of the rotating frame 2. When removing it, the rectangular tube moves axially and exits from the end of the rectangular limiting groove 201. This solution is suitable for rectangular tubes that are small in size or whose weight is easy to transfer.

[0067] Example 3:

[0068] This embodiment provides a rectangular tube positioning fixture, based on Figure 14 As shown, the device includes a base 501, a slide rail 502, and at least two sets of rotation limiting devices as shown in Embodiment 1. The slide rail 502 is mounted on the base 501, and each set of rotation limiting devices has a support base 1 with a slider 503 mounted on the bottom of the support base 1. Of course, the slider 503 can also be integrally formed with the support base 1. All rotation limiting devices are slidably mounted on the slide rail 502 via the slider 503 and are arranged at intervals along the extension direction of the slide rail 502, with the axes of all rotation limiting devices coinciding with each other. The number of rotation limiting devices can be reasonably increased according to the length of the rectangular tube being processed. Since all rotation limiting devices are confined on the slide rail 502, it is easier to align the axes of multiple sets of rotation limiting devices.

[0069] In use, for long rectangular tubes, the tubes can be simultaneously placed within the rectangular limiting grooves 201 of multiple sets of rotating limiting devices. These multiple sets of rotating limiting devices simultaneously support the rectangular tubes, ensuring their stability. The distance between these multiple sets of rotating limiting devices can be adjusted by sliding them on the slide rail 502 to accommodate rectangular tubes of different specifications.

[0070] Step 1: Taking a set of rotation limiting devices as an example, open the top bracket 202 and hang the rectangular tube from the top into the rectangular limiting groove 201 of the corresponding rotation limiting device. The rectangular tube abuts against the bottom pad 217. The bottom pad 217 moves downward and the spring 219 is compressed, providing a buffering effect. Fasten the top bracket 202 onto the bottom bracket 203 and connect them. Tighten the top clamping bolt 214 and the side clamping bolt 215 so that their pressing ends press against the side wall of the rectangular tube to clamp the rectangular tube.

[0071] Step 2: Pull out the anti-rotation pin 4 inserted in the first anti-rotation hole 110 and the second anti-rotation hole 224, and try to rotate the rotating frame 2. If the rotating frame 2 does not rotate smoothly, adjust the position and clamping degree of the rotating frame 2 by rotating the end of the roller support 302 away from the ball 301 until it rotates smoothly.

[0072] Step 3: Rotate the rotating frame 2. After the rectangular tube is rotated to a suitable processing position, insert the anti-rotation pin 4 through the first anti-rotation hole 110 and align it with the second anti-rotation hole 224. Fix the rotating frame 2 and process the rectangular tube. After processing one position of the rectangular tube, pull out the anti-rotation pin 4, continue rotating the rotating frame 2 to the next processing position, and insert the anti-rotation pin 4 again through the first anti-rotation hole 110 and align it with the second anti-rotation hole 224. Fix the rotating frame 2 and continue processing the rectangular tube. Repeat this process until the rectangular tube is fully processed.

[0073] Fourth step: Rotate the rotating frame 2 to the initial position where the top support 202 is at the top. Insert the anti-rotation pin 4 through the first anti-rotation hole 110 and the second anti-rotation hole 224 aligned with the first anti-rotation hole 110 to fix the support. Rotate the top clamping bolt 214 and the side clamping bolt 215 in the opposite direction to loosen the rectangular tube. Open the top support 202 and remove the processed rectangular tube from the rectangular limiting groove 201 by hoisting.

[0074] Example 4:

[0075] This embodiment provides a rectangular tube positioning fixture, including a base 501, a slide rail 502, and at least two sets of rotation limiting devices as shown in Embodiment 2. The slide rail 502 is mounted on the base 501, and each set of rotation limiting devices has a support base 1 with a slider 503 mounted on the bottom of the support base 1. Of course, the slider 503 can also be integrally set with the support base 1. All rotation limiting devices are slidably mounted on the slide rail 502 via the slider 503 and are arranged at intervals along the extension direction of the slide rail 502, with the axes of all rotation limiting devices coinciding with each other. The number of rotation limiting devices can be reasonably increased according to the length of the rectangular tube being processed.

[0076] In use, the difference from the scheme in Embodiment 3 is that the rectangular tube needs to be inserted axially into the rectangular limiting groove 201 from the end of the rotating frame 2. When removing, the rectangular tube moves axially and moves out from the end of the rectangular limiting groove 201.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rotation limiting device, comprising a support base (1) and a rotating frame (2), wherein a plurality of support rollers (101) distributed along the circumference are mounted on the support base (1), the rotating frame (2) is rotatably mounted on the plurality of support rollers (101), a rectangular limiting groove (201) for placing a rectangular tube is provided at the center of the rotating frame (2), and an anti-rotation component for limiting the rotation of the rotating frame (2) is provided between the support base (1) and the rotating frame (2); Its characteristics are: The support base (1) is also equipped with two support plates (102) that cover both ends of the rotating frame (2). Both support plates (102) are provided with openings (103) for avoiding rectangular tubes. Each support plate (102) is provided with several rolling support components (3) that roll against the end face of the rotating frame (2).

2. The rotation limiting device as described in claim 1, characterized in that: The rolling support assembly (3) includes a ball (301) and a roller support (302). The outer side wall of the roller support (302) is provided with a first external thread (304). The roller support (302) is screwed through the first external thread (304) and installed on the support plate (102). The roller support (302) has a cavity (305) at the end near the rotating frame (2). The ball (301) is placed in the cavity (305) and can rotate. The ball (301) extends out of the cavity (305) and abuts against the rotating frame (2).

3. The rotation limiting device as described in claim 2, characterized in that: The rolling support assembly (3) also includes an oil nozzle (303), which is installed at the end of the roller support (302) away from the ball (301). The roller support (302) has an oil inlet channel (306) inside that connects the oil nozzle (303) and the cavity (305).

4. The rotation limiting device as described in claim 1, characterized in that: The support rollers (101) include two sets of top rollers (104) and two sets of bottom rollers (105). The two sets of bottom rollers (105) are located on the bottom side of the axis of the rotating frame (2), and the two sets of bottom rollers (105) are located on both sides of the vertical center line of the rotating frame (2). The two sets of top rollers (104) are located on the top side of the axis of the rotating frame (2), and the two sets of top rollers (104) are located on both sides of the vertical center line of the rotating frame (2).

5. The rotation limiting device as described in claim 1, 2, 3, or 4, characterized in that: It also includes a buffer support assembly (216), which includes an elastic support member and a bottom pad (217) located on the top side of the bottom wall of the rectangular limiting groove (201). The bottom pad (217) is movably connected to the bottom wall of the rectangular limiting groove (201) through the elastic support member.

6. The rotation limiting device as described in claim 5, characterized in that: The buffer support assembly (216) further includes a support column (218), the bottom end of which is provided with a second external thread (221), and the support column (218) is screwed into the bottom wall of the rectangular limiting groove (201) through the second external thread (221); The elastic support is a spring (219), which is sleeved on the outside of the support column (218). The bottom end of the spring (219) is connected to the support column (218), and the top end of the spring (219) extends out of the top end of the support column (218) and is fixedly connected to the bottom wall of the bottom pad (217). The top end of the support column (218) is provided with a polygonal inner hole (222), and the bottom pad (217) is provided with an adjustment through hole (223) aligned with the polygonal inner hole (222).

7. The rotation limiting device as described in claim 1, 2, 3, 4, or 6, characterized in that: The anti-rotation component is a anti-rotation pin (4). Both of the two support plates (102) are provided with first anti-rotation holes (110). The first anti-rotation holes (110) on the two support plates (102) are arranged opposite to each other. The end face of the rotating frame (2) is provided with a plurality of second anti-rotation holes (224) arranged around its axis. Any second anti-rotation hole (224) can be rotated and aligned with the first anti-rotation hole (110). The anti-rotation pin (4) passes through the first anti-rotation hole (110) and the second anti-rotation hole (224) aligned with the first anti-rotation hole (110) to fix the rotating frame (2).

8. The rotation limiting device as described in claim 1, characterized in that: The rotating frame (2) also includes a top clamping bolt (214) and a side clamping bolt (215). The top clamping bolt (214) is screwed through the top wall of the rectangular limiting groove (201) from the outside, and the side clamping bolt (215) is screwed through the side wall of the rectangular limiting groove (201) from the outside. The ends of the top clamping bolt (214) and the side clamping bolt (215) extending into the rectangular limiting groove (201) are both extrusion ends for abutting against the rectangular tube.

9. The rotation limiting device as described in claim 1, characterized in that: The rotating frame (2) includes a top support (202) and a bottom support (203), the rectangular limiting groove (201) is located on the bottom support (203), and the top support (202) is detachably connected to the top of the bottom support (203).

10. The rotation limiting device as described in claim 9, characterized in that: The rotating frame (2) also includes a hinge (204) and a locking bolt (205); the two ends of the hinge (204) are respectively provided with a top hinge shaft (210) and a bottom hinge shaft (211), the hinge (204) is rotatably connected to the top support (202) through the top hinge shaft (210), and the hinge (204) is rotatably connected to the bottom support (203) through the bottom hinge shaft (211); The top bracket (202) has a bolt notch (212), and the bottom bracket (203) has a locking screw hole (213) aligned with the bolt notch (212). The locking bolt (205) passes through the bolt notch (212) and is screwed into the locking screw hole (213). The bolt head of the locking bolt (205) is supported on the side edge of the bolt notch (212).

11. The rotation limiting device as described in claim 9 or 10, characterized in that: The top bracket (202) includes a top weld joint (206) and top arc backing plates (207) fixedly connected to both sides of the top weld joint (206). The bottom bracket (203) includes a bottom weld joint (208) and bottom arc backing plates (209) fixedly connected to both sides of the bottom weld joint (208). The rectangular limiting groove (201) is located at the bottom weld joint (208). The bottom edge height position of the top arc backing plate (207) is higher or lower than the bottom edge height position of the top weld joint (206), and correspondingly, the bottom edge height position of the bottom arc backing plate (209) is lower or higher than the bottom edge height position of the bottom weld joint (208). The bottom edge of the top arc backing plate (207), the top edge of the bottom arc backing plate (209), the bottom edge of the top weld joint (206), and the top edge of the bottom weld joint (208) are coupled to each other.

12. The rotation limiting device as described in claim 1, characterized in that: The support base (1) includes a frame body (106) in a "U" shape. Both the support roller (101) and the rotary frame (2) are located inside the frame body (106). Two support plates (102) are respectively bolted to both sides of the frame body (106). The support roller (101) includes a roller body (108) and a wheel axle (109). The wheel axle (109) is mounted between the two support plates (102). Both ends of the wheel axle (109) are bolted to the two support plates (102) respectively. The roller body (108) is rotatably sleeved outside the wheel axle (109). The rotary frame (2) is mounted on the roller body (108).

13. A rectangular tube positioning fixture, characterized in that: It includes a base (501), a slide rail (502), and at least two groups of rotary limiting devices as described in any one of claims 1-12. The slide rail (502) is installed on the base (501). Each support base (1) of each group of rotary limiting devices is provided with a slider (503) installed at the bottom of the support base (1). All the rotary limiting devices are slidably installed on the slide rail (502) through the sliders (503) and are arranged at intervals along the extension direction of the slide rail (502). The axes of all the rotary limiting devices coincide with each other.

Images