Square tube inner wall polishing device

Abstract

The utility model relates to the technical field of devices for grinding or polishing, in particular to a square tube inner wall grinding device. A square tube inner wall grinding device comprises a base, a grinding mechanism and a square tube supporting frame are arranged on the base and used for being oppositely arranged in the length direction of a square tube, and at least one of the grinding mechanism and the square tube supporting frame is provided with a driving mechanism to drive the grinding mechanism and the square tube supporting frame to get close to each other and get away from each other. The polishing head comprises a pressing rod and a polishing piece hinged to the pressing rod, the pressing rod is rotationally assembled on the polishing frame, the polishing piece is hinged to the swing end of the pressing rod, the pressing rod is located above the square pipe supporting frame and used for stretching into the square pipe to be polished, and a spring pressing structure is arranged on the polishing frame. The spring pressing structure is used for pressing the pressing rod to enable the grinding piece to be pressed on the inner wall of the square pipe. The polishing piece can be relatively small and exquisite, so that the polishing piece can be matched with more polishing materials, the overall structure is relatively simple, and the polishing piece can be suitable for being used for small square pipes.

Description

Technical Field

[0001] The utility model relates to the technical field of devices for grinding or polishing, in particular to a square tube inner wall grinding device. Background Art

[0002] A waveguide is a hollow metal or metal-coated tube with a very smooth inner wall. When ultra-high frequency electromagnetic waves pass through it, the pulse signal can be transmitted to the destination with minimal loss. The commonly used waveguide is a square waveguide. However, the existing process of grinding square waveguides requires hand-held grinding tools for grinding and polishing. Moreover, the strength is difficult to control during grinding, and the grinding consumes a lot of human resources, which greatly reduces the efficiency of grinding and polishing waveguides.

[0003] There are devices for polishing square tubes in the prior art. For example, the utility model patent with authorization announcement number CN207971809U discloses a square tube inner wall polishing device, including a polishing component, a limit component, a support platform and a material moving component. The material moving component is located on the top of the support platform. A placement plate is provided on the top of the support platform. The placement plate is a rectangular structure. The limit component is located on the top of the placement plate. The limit component includes four limit plates and a clamping component. The polishing component includes a first mounting plate and a second mounting plate that are spaced and horizontally arranged. An adjustment component is provided between the first mounting plate and the second mounting plate. Polishing cloths are detachably installed on the first mounting plate and the second mounting plate. The two mounting plates and the polishing cloth form a polishing head.

[0004] The utility model can automatically complete the limiting operation of the workpiece through the limiting component, reducing the input of manpower, and can complete the polishing operation of the inner wall of the square tube through the material moving component and the polishing component, reducing the labor intensity of the operator and improving the polishing efficiency of the inner wall of the square tube. However, the polishing head of the polishing component of the utility model needs a motor to drive the adjustment component to adjust the polishing distance, the structure is complicated, and it is not suitable for use with smaller square tubes. Utility Model Content

[0005] The utility model aims to provide a square tube inner wall grinding device, which is used to solve the problem that the grinding head of the polishing assembly of the existing square tube inner wall polishing device needs a motor-driven adjustment assembly to adjust the grinding distance, has a complex structure, and is not suitable for use with smaller square tubes.

[0006] The utility model adopts the following technical scheme: a square tube inner wall grinding device, comprising a base, on which a grinding mechanism and a square tube support frame are arranged, the grinding mechanism and the square tube support frame are used to be arranged relatively in the length direction of the square tube, at least one of the two is configured with a driving mechanism to drive the two to approach and move away from each other, the grinding mechanism comprises a grinding frame and a grinding head, the grinding head comprises a pressure rod and a grinding piece hinged to the pressure rod, the pressure rod is rotatably assembled on the grinding frame, the grinding piece is hinged to the swing end of the pressure rod, the pressure rod is located at the upper position of the square tube support frame and is used to extend into the square tube to be polished, and a spring clamping structure is arranged on the grinding frame, the spring clamping structure is used to clamp the pressure rod to cause the grinding piece to be pressed against the inner wall of the square tube.

[0007] Furthermore, the spring clamping structure includes a limit plate and a clamping block which are guided and slidably arranged on the grinding frame, a clamping spring is arranged between the limit plate and the clamping block, the clamping block is used to clamp the pressure rod, and a clamping screw is screwed on the grinding frame to press the limit plate.

[0008] Furthermore, the square tube support frame is slidably arranged on the base along the extension direction of the pressure rod, the grinding mechanism is fixedly arranged on the base, and the driving mechanism is connected to the square tube support frame for driving the square tube to slide back and forth relative to the grinding piece.

[0009] Furthermore, the square tube support frame is provided with a square tube limiting structure perpendicular to the sliding direction of the square tube support frame, and the square tube limiting structure includes two groups of limiting blocks which are oppositely and adjustably arranged perpendicular to the sliding direction of the square tube support frame.

[0010] Furthermore, the square tube limiting structure includes an optical axis perpendicular to the sliding direction of the square tube support frame, two limiting blocks are slidingly arranged on the optical axis, and a locking structure is arranged between the two limiting blocks and the optical axis.

[0011] Furthermore, the supporting surface of the square tube support frame for supporting the square tube includes an elastic buffer surface for allowing the square tube to float in the up and down directions.

[0012] Furthermore, the square tube support frame includes a bottom plate and a buffer plate. The buffer plate is floatingly arranged on the bottom plate in the up and down directions through an elastic buffer structure, and the upper surface of the buffer plate constitutes the elastic buffer surface.

[0013] Furthermore, a plurality of support frame grooves perpendicular to the sliding direction of the square tube support frame are arranged on the bottom plate along the sliding direction of the square tube support frame, and the buffer plate is arranged in each support frame groove.

[0014] Furthermore, the buffer plate is a channel steel with an opening facing the groove of the support frame, and the elastic buffer structure is a buffer spring.

[0015] Furthermore, a buffer pin is installed on the buffer plate, which passes through the buffer plate and is screwed on the bottom of the groove of the support frame to guide and limit the buffer plate in the up and down directions.

[0016] The square tube inner wall grinding device of the utility model improves the existing square tube inner wall grinding device, and the beneficial effects of the square tube inner wall grinding device of the utility model are: one end of the pressure rod is rotatably assembled on the grinding frame, and the swinging end of the pressure rod is hinged with a grinding piece, so that the grinding piece and the square tube are flexibly matched, and the driving mechanism drives the grinding piece and the square tube to slide relative to each other, and the clamping state between the grinding piece and the square tube is adjusted by the spring clamping structure on the grinding frame. Since the spring clamping structure for adjusting the grinding piece is located outside the square tube, the grinding piece extends into the inside of the square tube for grinding, so the grinding piece can be relatively small, so that the grinding piece can be adapted to more grinding materials, and the pressure of the spring clamping structure on the pressure rod can also be adjusted according to the grinding effect during the grinding process, so the clamping effect is convenient to adjust, and the overall structure is relatively simple, which can be suitable for use with smaller square tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a square tube inner wall grinding device of the utility model;

[0018] Figure 2 This is an enlarged view of the structure of the spring pressing structure of the square tube inner wall grinding device;

[0019] Figure 3 It is a structural schematic diagram of a square tube support frame of an embodiment of the square tube inner wall grinding device of the utility model;

[0020] Figure 4 It is a structural schematic diagram of a square tube limiting structure of an embodiment of the square tube inner wall grinding device of the utility model.

[0021] In the figure: 1. base frame; 2. slide frame; 3. support frame connecting rod; 4. square tube support frame; 5. grinding part; 6. limit block; 7. buffer plate; 8. limit slider; 9. locking screw; 10. optical axis; 11. buffer pin; 12. buffer spring; 13. pressure rod; 14. grinding frame; 15. grinding pin; 16. clamping screw; 17. limit plate; 18. clamping spring; 19. clamping block; 20. motor connecting rod; 21. drive motor; 22. channel steel. DETAILED DESCRIPTION

[0022] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0023] First, the technical solution of the utility model is generally described as follows:

[0024] Waveguides are used to transmit ultra-high frequency electromagnetic waves. Pulse signals can be transmitted to the destination with minimal loss through them. They are hollow metal conduits or metal-coated tubes with very smooth inner walls. The size of the inner diameter of the waveguide varies depending on the wavelength of the signal being transmitted. They are mostly used in radio fields such as centimeter-wave and millimeter-wave radio communications, radar, and navigation. The utility model is described with a square waveguide as the background.

[0025] The existing method of grinding and polishing square waveguides is to use hand-held grinding tools. The force is difficult to control during grinding, and the grinding consumes a lot of human resources, which greatly reduces the efficiency of grinding and polishing the waveguide. Therefore, a device for grinding square tubes has appeared in the prior art. The device completes the polishing operation of the inner wall of the square tube through a material moving component and a polishing component. However, the grinding head of the polishing component requires a motor-driven adjustment component to adjust the distance, and the structure is complicated and is not suitable for use with smaller square tubes.

[0026] Based on the problems of the prior art, the utility model designs a square tube inner wall grinding device, comprising a base, on which a grinding mechanism and a square tube support frame are arranged relatively in the length direction of the square tube, at least one of the grinding mechanism and the square tube support frame is provided with a driving mechanism, the driving mechanism is used to drive the grinding piece and the square tube to approach and move away from each other, the grinding mechanism comprises a grinding frame and a grinding head, the grinding head comprises a pressure rod and a grinding piece hinged to the pressure rod, the grinding piece is used to grind the inner wall of the square tube, the pressure rod is rotatably assembled on the grinding frame, the grinding piece is hinged to the swing end of the pressure rod, the pressure rod is located above the square tube support frame and is used to extend into the square tube to be polished to drive the grinding piece to grind.

[0027] A spring clamping structure is provided on the grinding frame, and the spring clamping structure is used to adjust the clamping state between the grinding piece and the square tube. The grinding piece is hinged at the swinging end of the pressure rod and can adapt to the grinding according to the movement of the square tube, and will not completely clamp the square tube, so that the square tube can follow the square tube support frame to maintain a relatively fixed state under the action of gravity and friction. Since the spring clamping structure for adjusting the grinding piece is located outside the square tube, the grinding piece extends into the inside of the square tube for grinding, so the grinding piece can be relatively small, so that the grinding piece can adapt to more grinding materials. During the grinding process, the pressure of the spring clamping structure on the pressure rod can also be adjusted according to the grinding effect, which is convenient for adjusting the clamping effect, and the overall structure is relatively simple, which can be suitable for smaller square tubes.

[0028] Specific embodiment of the square tube inner wall grinding device of the utility model:

[0029] The structural schematic diagram of the square tube inner wall grinding device of the utility model is as follows Figure 1-4As shown, a square tube inner wall grinding device includes a base, a grinding mechanism is arranged on the base, and is used to grind the inner wall of the square tube. A square tube support frame 4 is also arranged on the base to support the square tube. At least one of the grinding mechanism and the square tube support frame 4 is configured with a driving mechanism to drive the grinding piece 5 and the square tube to move closer to and away from each other. The base includes a base frame 1, and the grinding mechanism and the driving mechanism are respectively arranged at both ends of the length direction of the base frame 1. The grinding mechanism includes a grinding frame 14 and a grinding head. The grinding head includes a pressure rod 13 and a grinding piece 5. The pressure rod 13 is rotatably assembled on On the grinding frame 14, the swing end of the pressure rod 13 is hinged to the grinding piece 5, specifically through the grinding pin 15, so that the grinding piece 5 is more flexible and adaptable, so that when the grinding piece 5 is grinding in the square tube, it can flexibly cooperate with the square tube according to the movement of the square tube, and the grinding effect is better. The pressure rod 13 is located above the square tube support frame 4 and extends into the square tube to be polished, driving the grinding piece 5 to grind the inner wall of the square tube. A spring clamping structure is provided on the grinding frame 14, and the spring clamping structure is used to clamp the pressure rod 13 to prompt the grinding piece 5 to be pressed against the inner wall of the square tube.

[0030] In this embodiment, since the square tube is easy to move and adjust, in order to make the structure of the grinding frame 14 relatively simple, preferably, the square tube support frame 4 is set on the base in a guided sliding manner along the extension direction of the pressure rod 13, and the grinding mechanism is fixedly set on the base. Specifically, two slides 2 are symmetrically arranged along the length direction of the base 1 between the grinding mechanism and the driving mechanism on the base 1, and four supporting sliders are symmetrically installed on the slide 2. The square tube support frame 4 is fixedly connected to the supporting slider, and the square tube support frame 4 follows the supporting slider to slide on the square tube support frame 4. The driving mechanism is connected to the square tube support frame 4 to drive the square tube to slide back and forth relative to the grinding piece 5, so that the grinding piece 5 is relatively stable, and the position of the square tube is operated for precise grinding, and the grinding process is more stable, without the need for a driving or adjusting structure to adjust the position. Of course, in other embodiments, a slide 2 is set on the base below the driving mechanism, so that the grinding piece 5 is slidably set on the base, and the square tube support frame is fixedly set on the base, ensuring that the grinding piece 5 and the square tube are in a relative sliding state to realize the grinding of the square tube by the grinding piece 5.

[0031] In this embodiment, the driving mechanism includes a driving motor 21, which is arranged at the edge of the base frame 1 through a square support frame. A connecting rod assembly is rotatably connected to the rotating shaft of the driving motor 21, specifically including a motor connecting rod 20 connected to the driving motor 21, and a support frame connecting rod 3 connected to the square tube support frame 4. The motor connecting rod 20 and the support frame connecting rod 3 are hinged, and the driving mechanism is connected to the square tube support frame 4 to form a crank slider mechanism. The driving motor 21 drives the square tube support frame 4 to perform reciprocating motion through the connecting rod assembly.

[0032] In this embodiment, the spring clamping structure includes a limit plate 17 and a clamping block 19. The grinding frame 14 is provided with a slide groove corresponding to the limit plate 17 and the clamping block 19 in the up and down directions. The limit plate 17 and the clamping block 19 are provided with sliders at both ends, and are slidably arranged on the grinding frame 14 through the slider guide. The clamping block 19 is provided with an anti-slip rod extending upward, the anti-slip rod passes through the limit plate 17 and is connected with an anti-slip nut at the upper end. A clamping spring 18 is provided between the limit plate 17 and the clamping block 19, and the clamping spring 18 is sleeved on the anti-slip rod. The clamping block 19 is used to clamp the pressure rod 13. A threaded hole is provided at the upper end of the grinding frame 14, and a clamping screw 16 is screwed into the threaded hole. A pressing hole is provided above the limit plate 17. The clamping screw 16 passes through the threaded hole of the grinding frame 14 and extends into the pressing hole of the limit plate 17 and presses the limit plate 17 downward. There are two compression springs 18 arranged symmetrically, so that the limiting piece 17 is pressed by the clamping screw 16, and the downward pressure is transmitted to the clamping block 19 by the clamping spring 18, so that the clamping block 19 is kept in the state of clamping the pressure rod 13, and the square tube is polished. The pressure rod 13 can be relaxed by loosening the clamping screw 16, and the square tube can be conveniently inserted or taken out. It is easy to use, simple in structure and stable. Of course, in other embodiments, a limiting piece 17 can also be set in the grinding frame 14, and spring seats are respectively set on the limiting piece 17 and the pressure rod 13. The limiting piece 17 and the pressure rod 13 are connected by a spring, and the limiting piece 17 is directly pressed by the clamping screw 16, and the pressure rod 13 is pressed by the spring to achieve the clamping state of the pressure rod 13. Or in other embodiments, a leaf spring is set between the grinding frame 14 and the pressure rod 13, and the leaf spring drives the grinding piece 5 to always press against the inner wall of the square tube. When the square tube needs to be taken out or put in, the pressure rod 13 can be lifted to compress the leaf spring.

[0033] The square tube is prone to deflection during the relative movement with the square tube support frame 4. In order to ensure the stability of the square tube during the grinding process, preferably, a square tube limiting structure is provided on the square tube support frame 4, and the square tube limiting structure is arranged along a direction perpendicular to the sliding direction of the square tube support frame 4, thereby ensuring that the square tube remains relatively stable in the direction perpendicular to the sliding direction without deflection, thereby ensuring the reliability of the grinding process.

[0034] In this embodiment, the square tube limiting structure includes an optical axis 10, which is arranged along a direction perpendicular to the sliding direction of the square tube support frame 4. Two limiting blocks 6 are arranged on the optical axis 10, and the two limiting blocks 6 are guided to slide on the optical axis 10. A locking structure is arranged between the two limiting blocks 6 and the optical axis 10, specifically a locking screw 9. A limiting slider 8 is installed on the limiting block 6, and the limiting slider 8 is sleeved on the optical axis 10 to slide. The limiting block 6 is penetrated with a locking screw 9. The upper end of the optical axis 10 has a plane for locking and fixing the locking screw 9. The movement of the limiting block 6 is achieved by locking and loosening the locking screw 9. It is easy to use and the adjustment method is simple. Of course, in other embodiments, the limiting block 6 can also be connected with an elastic clip that can be clamped on the optical axis 10. The elastic clip is removed and moved to a suitable position to adjust the position of the limiting block 6. Or in other embodiments, different fixing holes are arranged perpendicular to the sliding direction of the square tube support frame 4, and the limiting effect on the square tube is achieved by the limiting blocks 6 arranged in different fixing holes.

[0035] Since the grinding piece 5 is hinged on the pressure rod 13, it will swing and deflect during the grinding process. In order to ensure that the grinding piece 5 always fits the inner wall of the square tube and the grinding piece 5 grinds the square tube evenly during the grinding process, it is preferred that the supporting surface of the square tube support frame 4 for supporting the square tube includes an elastic buffer surface for allowing the square tube to float in the up and down directions. The elastic buffer surface is used to provide buffering for the square tube, so that the square tube can generate a certain floating amount on the square tube support frame 4, thereby ensuring the reliability of the grinding effect.

[0036] Specifically, in order to ensure the stability of the buffering process and to provide good support for the square tube, the square tube support frame 4 includes a bottom plate and a buffer plate 7. The buffer plate 7 is arranged on the bottom plate in a floating manner in the vertical direction through an elastic buffer structure. The upper surface of the buffer plate 7 constitutes an elastic buffer surface, so that the support surface of the buffer plate 7 can provide support for the square tube, ensuring the stability of the square tube during the grinding process, and the buffer plate 7 can float in the vertical direction, so that the grinding effect is better. Of course, in other embodiments, a buffer rubber pad can be directly arranged on the upper surface of the square tube support frame 4, and the buffer rubber pad can achieve the buffering effect of the square tube.

[0037] Furthermore, in order to adapt to square tubes of more sizes and make the buffer plate 7 structure more stable, preferably, a plurality of support frame grooves perpendicular to the sliding direction of the square tube support frame 4 are arranged on the bottom plate along the sliding direction of the square tube support frame 4, and a plurality of support frame grooves are arranged along the sliding direction of the square tube support frame 4, and a buffer plate 7 is arranged on each support frame groove. The buffer plate 7 is arranged in each support frame groove through an elastic buffer structure, and the buffer plate 7 is higher than the support frame groove by a certain height, and the groove edge of the support frame groove limits the limit compression of the elastic buffer structure to ensure floating while being more stable, and multiple buffer plates 7 are arranged at different positions to support square tubes of different sizes.

[0038] In this embodiment, the buffer plate 7 is a channel steel 22 with an opening toward the support frame groove, and the elastic buffer structure is a buffer spring 12. The buffer spring 12 is supported and arranged between the support frame groove and the channel steel 22. A buffer pin 11 passing through the support frame groove and the channel steel 22 is installed between the support frame groove and the channel steel 22. The buffer spring 12 is arranged between the grooves opposite to each other through the opening, so that the arrangement of the buffer spring 12 is more stable, and the buffer pin 11 is used to achieve the limiting and guiding effects. The structure is simple and easy to assemble. The buffer effect of the spring is relatively stable, and the buffer pin 11 of the buffer plate 7 has the limiting and guiding effects, so that the buffer effect is only along the up and down directions, so that the floating direction of the buffer plate 7 remains stable. Of course, in other embodiments, a guide rod is provided on the buffer spring 12 to achieve the stability of the buffer spring 12, the buffer plate 7 is a straight buffer plate, and the square tube support frame 4 can also be set as a straight support plate.

[0039] In this embodiment, four buffer plates 7 are symmetrically arranged along both ends of the square tube support frame 4, two buffer pins 11 are used to limit the two ends of each row of buffer plates 7, and three buffer springs 12 are evenly arranged on each buffer plate 7. The buffer plate 7 can move up and down, and the square tube support frame 4 can be used for three commonly used square tubes of different lengths, which are 90 cm, 150 cm, and 160 cm respectively.

[0040] In this embodiment, a square tube limiting structure is provided in the middle position of the square tube support frame 4, and baffles are provided at both ends of the length direction of the square tube limiting structure to prevent the limiting block 6 from sliding out of the square tube support frame 4. The two ends of the length direction of the square tube limiting structure are groove walls of the support frame groove, and baffles are respectively provided at both ends of the length direction of the groove wall to prevent the square tube from deflecting out of the square tube support frame 4.

[0041] When the square tube inner wall grinding device is in use, the clamping screw 16 is loosened to make the clamping spring 18 in a relaxed state, and the pressure rod 13 is placed inside the square tube, and then the square tube is placed on the square tube support frame 4 for limiting. Two limit blocks 6 can be used to limit the other tube laterally, and the locking screw 9 is screwed downward, and the lateral edge of the square tube support frame 4 has its own limit to prevent the limit block 6 from moving too much and causing the grinding piece 5 to be subjected to lateral force. The clamping screw 16 is screwed downward until the clamping spring 18 is in a clamping state, so that the grinding piece 5 and the inner wall of the square tube are in a clamping state. Then, the driving motor 21 is turned on, and the connecting rod assembly performs a rotational motion, and the square tube support frame 4 is driven to perform reciprocating motion through the support frame connecting rod 3. During grinding, the limit slider 8 can be used to slide on the optical axis 10 to grind different areas inside the other tube. After grinding one side of the other tube, it can be turned over and repeated to grind the other sides.

[0042] Through the above description of the specific embodiment of the square tube inner wall grinding device of the utility model, it can be seen that the square tube inner wall grinding device of the utility model is assembled on the grinding frame by rotating one end of the pressure rod, and the swinging end of the pressure rod is hinged with a grinding piece, so that the grinding piece and the square tube can be flexibly matched, and the driving mechanism drives the grinding piece and the square tube to slide relative to each other, and the clamping state between the grinding piece and the square tube is adjusted by the spring clamping structure on the grinding frame. Since the spring clamping structure for adjusting the grinding piece is located outside the square tube, the grinding piece extends into the inside of the square tube for grinding, so the grinding piece can be relatively small, so that the grinding piece can be adapted to more grinding materials, and the pressure of the spring clamping structure on the pressure rod can also be adjusted according to the grinding effect during the grinding process, so as to facilitate the adjustment of the clamping effect, and the overall structure is relatively simple, which can be suitable for use with smaller square tubes.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A square tube inner wall grinding device, comprising a base, on which a grinding mechanism and a square tube support frame are arranged, characterized in that: The grinding mechanism and the square tube support frame are used to be arranged relative to each other in the length direction of the square tube. At least one of the two is equipped with a driving mechanism to drive the two to approach and move away from each other. The grinding mechanism includes a grinding frame and a grinding head. The grinding head includes a pressure rod and a grinding piece hinged to the pressure rod. The pressure rod is rotatably assembled on the grinding frame. The grinding piece is hinged to the swinging end of the pressure rod. The pressure rod is located at the upper position of the square tube support frame and is used to extend into the square tube to be polished. A spring clamping structure is provided on the grinding frame. The spring clamping structure is used to clamp the pressure rod to cause the grinding piece to be pressed against the inner wall of the square tube.

2. The square tube inner wall grinding device according to claim 1 is characterized in that: The spring clamping structure comprises a limiting plate and a clamping block which are slideably arranged on the grinding frame, a clamping spring is arranged between the limiting plate and the clamping block, the clamping block is used to clamp the pressure rod, and a clamping screw is screwed on the grinding frame to press the limiting plate.

3. The square tube inner wall grinding device according to claim 1 or 2, characterized in that: The square tube support frame is slidably arranged on the base along the extension direction of the pressure rod, the grinding mechanism is fixedly arranged on the base, and the driving mechanism is connected to the square tube support frame for driving the square tube to slide back and forth relative to the grinding piece.

4. The square tube inner wall grinding device according to claim 1 or 2, characterized in that: The square tube support frame is provided with a square tube limiting structure perpendicular to the sliding direction of the square tube support frame, and the square tube limiting structure includes two groups of limiting blocks perpendicular to the sliding direction of the square tube support frame that are opposite and adjustable.

5. The square tube inner wall grinding device according to claim 4 is characterized in that: The square tube limiting structure comprises an optical axis perpendicular to the sliding direction of the square tube support frame, two limiting blocks are slidingly arranged on the optical axis, and a locking structure is arranged between the two limiting blocks and the optical axis.

6. The square tube inner wall grinding device according to claim 1 or 2, characterized in that: The supporting surface of the square tube support frame for supporting the square tube includes an elastic buffer surface for allowing the square tube to float in the up and down directions.

7. The square tube inner wall grinding device according to claim 6 is characterized in that: The square tube support frame comprises a bottom plate and a buffer plate. The buffer plate is arranged on the bottom plate in a floating manner in the up and down directions through an elastic buffer structure. The upper surface of the buffer plate constitutes the elastic buffer surface.

8. The square tube inner wall grinding device according to claim 7, characterized in that: The bottom plate is provided with a plurality of support frame grooves along the sliding direction of the square tube support frame and perpendicular to the sliding direction of the square tube support frame, and the buffer plate is arranged in each support frame groove.

9. The square tube inner wall grinding device according to claim 8, characterized in that: The buffer plate is a channel steel with an opening facing the groove of the support frame, and the elastic buffer structure is a buffer spring.

10. The square tube inner wall grinding device according to claim 9, characterized in that: The buffer plate is provided with a buffer pin which passes through the buffer plate and is screwed on the bottom of the groove of the support frame to guide and limit the buffer plate in the up and down directions.

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