Circular steel pipe surface trepanning machining equipment for automobile framework

Abstract

The invention relates to the field of automobile part machining, and discloses an automobile framework circular steel pipe surface trepanning machining device which comprises a base, a fixing ring is rotatably installed on the inner wall of a fixing box, a second gear is installed on the outer surface of the fixing ring, a first worm is meshed with the second gear, a containing groove is formed in the fixing ring, and a second worm is installed in the containing groove. Two sets of guide grooves are formed in the inner wall of the containing groove, two sets of positioning columns and movable columns are rotationally arranged on the inner wall of the containing groove, and the outer surfaces of the positioning columns and the outer surfaces of the movable columns are movably sleeved with pressing plates. According to the device, the first worm drives the first gear and drives the fixing ring and the workpiece to rotate, the one-way transmission between the first gear and the first worm can also ensure that the fixing ring is fixed, through the design, the outer surface of the workpiece does not need to be repeatedly locked, loosened and repeatedly machined, the clamping and positioning cost of the workpiece is greatly reduced, and the machining efficiency is improved. And the processing efficiency is obviously improved.

Description

Technical Field

[0001] This application relates to the field of automotive parts processing technology, and in particular to a device for processing holes on the surface of circular steel tubes used in automotive frames. Background Technology

[0002] As a common means of transportation, automobiles greatly improve the convenience of modern people's travel. The quality of automobile manufacturing directly depends on the quality of automobile frame processing. The surface processing of round steel tubes for automobile frames involves drilling. In the existing technology, the more common processing equipment is equipped with cutting tools or CNC inserts, drilling bits and other tools. During the processing, the round steel tube generally needs to be pre-fixed, and after calibration and positioning, drilling is carried out. Since there are more than one set of openings on the surface of the round steel tube, and the positions are different, the steel tube needs to be fixed, processed, fixed again and processed again in a cyclical operation throughout the drilling process, which seriously reduces the working efficiency of the equipment. The alternative solution in the existing technology is to set up different production lines, each corresponding to the drilling of different positions on the surface of the round steel tube. However, this method is too costly and increases the processing time and cost of the round steel tube. Therefore, there is an urgent need to redesign a drilling equipment for the surface of round steel tubes for automobile frames that can fix and complete all drilling processing at one time. Summary of the Invention

[0003] This application proposes a machine for drilling holes on the surface of circular steel tubes used in automobile frames, which has the advantage of high processing efficiency and solves the problem of low processing efficiency.

[0004] To achieve the above objectives, this application adopts the following technical solution: a machine for processing holes on the surface of circular steel tubes for automobile frames, including a base, and further comprising: The fixed box is configured as two horizontally symmetrical sets and installed on the top of the base. A worm gear is installed inside the fixed box. A slide seat and a telescopic rod are slidably installed on the top of the two sets of fixed boxes. A motor is fixedly installed at the telescopic end of the telescopic rod, and a drill bit is fixedly connected to the output shaft of the motor. A fixing ring is rotatably mounted on the inner wall of the fixed box. A second gear is mounted on the outer surface of the fixing ring. The first worm gear meshes with the second gear. A placement groove is opened inside the fixing ring. Two sets of guide grooves are opened on the inner wall of the placement groove. Two sets of positioning columns and movable columns are rotatably arranged on the inner wall of the placement groove. A pressure plate is movably sleeved on the outer surface of the positioning columns and movable columns. A friction plate is fixedly connected to the inner side of the pressure plate. The inner side of the pressure plate and the friction plate clamps the workpiece. An adapter plate is fixedly connected to the end of the pressure plate away from the positioning column. A guide plate is provided on the outer side of the adapter plate and is snapped into the guide groove. A second gear is fixedly connected to the outer side of the guide plate. A protective cover is installed on the outer side of the fixing ring. A second worm gear meshing with the second gear is installed inside the protective cover. This redesigned device allows for the simultaneous locking and fixing of the workpiece, enabling the machining of all openings and significantly reducing the machining time. To achieve this, the device utilizes a fixed box to provide rotational support for the fixed ring. A gear is fixed to the outer surface of the fixed ring, driven by a worm gear fixed to the inner wall of the fixed box, thus achieving the rotation and subsequent fixing of the fixed ring. Simultaneously, two sets of positioning pins, pressure plates, and movable pins are installed on the inner wall of the fixed ring. Using the positioning pins as fulcrums, a worm gear is driven to rotate the gear. The adapter plate and guide plate connected to one end of the movable pin rotate under the influence of the gear, and the pressure plate and friction plate move along the outer surface of the workpiece. The rotating connection allows the friction plate and pressure plate to contact and wrap around the workpiece, forming a frictional locking mechanism and simultaneously centering the workpiece. When the pressure plate is taut, the second worm gear closes, and the pressure plate remains locked through the unidirectional irreversible transmission between the second gear and the second worm gear. At this point, the workpiece and the fixed ring form a fixed unit. When drilling holes at different locations on the outer surface of the workpiece is required, the first worm gear can drive the first gear, which in turn drives the fixed ring and the workpiece to rotate. The unidirectional transmission between the first gear and the first worm gear also ensures that the fixed ring remains stationary. This design eliminates the need for repeated locking and unlocking of the workpiece for drilling holes on its outer surface, significantly reducing the cost of workpiece clamping and positioning and greatly improving processing efficiency.

[0005] Meanwhile, this device utilizes the unidirectional transmission characteristics of gear one and worm one to create a self-locking mechanism for the fixed ring after it stops moving. It also utilizes the unidirectional transmission characteristics of worm two and gear two to create a self-locking mechanism for the guide plate, adapter plate, and movable column after they stop moving. The former ensures the stability of the fixed ring, while the latter assists the pressure plate and friction plate in wrapping and locking the workpiece, preventing the pressure plate from loosening. Furthermore, the pressure plate can bend and deform to varying degrees according to the curvature of the workpiece's outer surface, allowing the device to adapt to workpieces of different sizes. By simply controlling the rotation of gear two at the corresponding angle and keeping the pressure plate taut after locking, workpieces of different sizes can be fixed. The surface contact, friction locking, and wrapping of the pressure plate and friction plate evenly distribute the clamping force across the workpiece surface, improving the device's applicability and protecting the workpiece from damage caused by uneven force during rigid clamping.

[0006] Preferably, two sets of support columns are fixedly installed on the top of the two sets of fixed boxes, and the slide is slidably installed on the outer surface of the support columns. A telescopic rod is also installed on the top of the left fixed box, and the telescopic end of the telescopic rod is fixedly connected to the slide. like Figure 2As shown, in order to more comprehensively adapt to the processing of holes at different positions on the outer surface of the workpiece, this device sets the slide, telescopic rod 2, motor and drill bit into a horizontally sliding structure. It is supported by a support column so that the drill bit can move along the axis of the workpiece. Combined with the rotation of the workpiece, it can directly cover all the holes that need to be processed on the surface of the workpiece.

[0007] Preferably, the friction plate is made of hard rubber, the pressure plate is made of stainless steel, and both the pressure plate and the friction plate are adapted to abut against the outer surface of the workpiece; like Figure 9 As shown, the friction plate directly abuts against the outer surface of the workpiece. It is made of hard rubber and can generate huge friction through deformation to assist the pressure plate in wrapping the workpiece. The pressure plate is made of stainless steel and can move around the outer surface of the workpiece under the rotation of the adapter plate and the movable column and adapt to the adapter deformation to wrap and fix the workpiece.

[0008] Preferably, the two sets of pressure plates and friction plates are equidistantly distributed around the axis of the fixing ring, and the workpiece is coaxial with the fixing ring; like Figure 9 As shown, the two sets of pressure plates are equidistantly distributed around the circumference. Under the action of the positioning column and the movable column, they can perfectly wrap around the outer surface of the workpiece and generate wrapping clamping force and friction force on the workpiece to achieve the fixation of the workpiece.

[0009] Preferably, the guide groove is formed in the middle of the inner wall of the placement groove, and the two sets of guide grooves are equidistantly distributed around the axis of the fixing ring. like Figure 1 , Figure 9 As shown, the adapter plate rotates to fit the inner wall of the placement slot, and its outer side is provided with an adapter plate, which is fitted into the guide slot to improve the stability of the adapter plate when rotating.

[0010] Preferably, the adapter plate is made of cast iron and fits against the inner wall of the placement groove, and the movable column is fixedly connected to the inner side of the adapter plate. like Figure 1 , Figure 9 As shown, the adapter plate is stably rotatable inside the placement slot by utilizing the strength of its cast iron, thereby enhancing the stability of the adapter plate during rotation through the guiding fit of the guide plate and the guide slot.

[0011] Preferably, the inner surface of the second gear and the outer surface of the fixed ring can slide relative to each other and fit together, and the first gear is fixed to the outer surface of the fixed ring away from the second gear by welding. The second gear slides onto the outer surface of the fixed ring and is fixedly connected to the guide plate, so its rotation will not interfere with the rotation of the fixed ring.

[0012] Preferably, the contact area between the pressure plate, the friction plate and the outer surface of the workpiece is proportional to the size of the workpiece, and the positioning column is rotatably installed on the inner wall of the placement groove; like Figure 9 As shown, when the size of the workpiece increases, the pressure plate and friction plate are subjected to greater bending deformation, resulting in a larger contact area, which allows for adaptation to workpieces of different sizes.

[0013] The beneficial effects of this invention are as follows: 1. This redesigned device enables the processing of all openings by locking and fixing the workpiece in one operation, significantly reducing the processing time for opening the workpiece. To achieve this, the device uses a fixed box to support the rotation of the fixed ring. A gear is fixed to the outer surface of the fixed ring, driven by a worm gear fixed to the inner wall of the fixed box, achieving the rotation and fixation of the fixed ring after stopping. Simultaneously, two sets of positioning pins, pressure plates, and movable pins are installed on the inner wall of the fixed ring. Using the positioning pins as fulcrums, a worm gear is driven to rotate the gear. The adapter plate and guide plate connected to one end of the movable pin rotate under the drive of the gear, and the pressure plate and friction plate move along the outer surface of the workpiece. The friction plate and pressure plate rotate and wrap around the workpiece, forming a frictional locking mechanism that simultaneously centers the workpiece. When the pressure plate is taut, the second worm gear closes, and the pressure plate remains locked through the unidirectional irreversible transmission between the second gear and the second worm gear. At this point, the workpiece and the fixed ring form a fixed unit. When drilling holes at different locations on the outer surface of the workpiece is required, the first worm gear can drive the first gear, which in turn drives the fixed ring and the workpiece to rotate. The unidirectional transmission between the first gear and the first worm gear also ensures that the fixed ring remains stationary. This design eliminates the need for repeated locking and unlocking of the workpiece for drilling holes on its outer surface, significantly reducing the cost of workpiece clamping and positioning and greatly improving processing efficiency.

[0014] 2. Simultaneously, this device utilizes the unidirectional transmission characteristics of gear one and worm one to create a self-locking mechanism for the fixed ring after it stops moving. Similarly, the unidirectional transmission characteristics of worm two and gear two create self-locking mechanisms for the guide plate, adapter plate, and movable column after they stop moving. The former ensures the stability of the fixed ring, while the latter assists the pressure plate and friction plate in enveloping and locking the workpiece, preventing the pressure plate from loosening. Furthermore, the pressure plate can bend and deform to varying degrees according to the curvature of the workpiece's outer surface, allowing the device to adapt to workpieces of different sizes. By simply controlling the rotation of gear two at the corresponding angle and keeping the pressure plate taut after locking, workpieces of different sizes can be fixed. The surface contact, friction locking, and enveloping action of the pressure plate and friction plate evenly distributes the clamping force across the workpiece surface, improving the device's applicability and protecting the workpiece from damage caused by uneven force during rigid clamping. Attached Figure Description

[0015] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles of this application in a clear and understandable manner.

[0016] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a schematic diagram showing the separation of the fixed ring, gear one, worm one, gear two, worm two, positioning column, pressure plate, movable column and adapter plate of the present invention; Figure 2 This is a front view diagram of the overall structure of the present invention; Figure 3 This is a frontal perspective view of the overall structure of the present invention; Figure 4 This is a front sectional view of the overall structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A; Figure 6 This is a schematic diagram of the internal structure of the fixing box of the present invention; Figure 7 This is a side sectional view of the fixing box of the present invention; Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B; Figure 9 This is a side sectional view of the fixing box and fixing ring of the present invention; Figure 10 For the present invention Figure 9 Enlarged schematic diagram of the structure at point C.

[0017] The components are as follows: 1. Base; 2. Fixing box; 3. Support column; 4. Telescopic rod one; 5. Slide seat; 6. Telescopic rod two; 7. Motor; 8. Drill bit; 9. Workpiece; 10. Fixing ring; 11. Placement slot; 12. Guide slot; 13. Gear one; 14. Worm gear one; 15. Gear two; 16. Worm gear two; 17. Protective cover; 18. Positioning column; 19. Pressure plate; 20. Movable column; 21. Adaptor plate; 22. Guide plate; 23. Friction plate. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] Please see Figures 1-10 This embodiment discloses a machine for drilling holes on the surface of a circular steel tube used in automobile frames, including a base 1, and further comprising: Fixed box 2, which is set as two horizontally symmetrical sets and installed on the top of base 1. The worm gear 14 is installed inside the fixed box 2. The top of the two fixed boxes 2 is slidably mounted with slide block 5 and telescopic rod 6. The telescopic end of telescopic rod 6 is fixedly mounted with motor 7. The output shaft of motor 7 is fixedly connected to drill bit 8. A fixed ring 10 is rotatably installed on the inner wall of the fixed box 2. A gear 15 is installed on the outer surface of the fixed ring 10. A worm gear 14 meshes with the gear 15. A placement groove 11 is opened inside the fixed ring 10. Two sets of guide grooves 12 are opened on the inner wall of the placement groove 11. Two sets of positioning columns 18 and movable columns 20 are rotatably arranged on the inner wall of the placement groove 11. A pressure plate 19 is movably sleeved on the outer surface of the positioning column 18 and the movable column 20. A friction plate 23 is fixedly connected to the inner side of the pressure plate 19. The workpiece 9 is clamped on the inner side of the pressure plate 19 and the friction plate 23. An adapter plate 21 is fixedly connected to the end of the pressure plate 19 away from the positioning column 18. A guide plate 22 is provided on the outer side of the adapter plate 21 and is snapped into the guide groove 12. A gear 15 is fixedly connected to the outer side of the guide plate 22. A protective cover 17 is installed on the outer side of the fixed ring 10. A worm gear 16 meshes with the gear 15 is installed inside the protective cover 17. This redesigned device allows for the locking and fixing of workpiece 9 in a single operation, enabling the processing of all openings and significantly reducing the processing time for workpiece 9. To achieve this, the device uses a fixed box 2 to provide rotational support for the fixed ring 10. A gear 13 is fixed to the outer surface of the fixed ring 10, driven by a worm gear 14 fixed to the inner wall of the fixed box 2. This achieves the rotation and fixation of the fixed ring 10 after it stops. Simultaneously, two sets of positioning posts 18, pressure plates 19, and movable posts 20 are installed on the inner wall of the fixed ring 10. Using the positioning posts 18 as fulcrums, a worm gear 16 located on the outer side of the fixed ring 10 drives the gear 15 to rotate. The adapter plate 21 and guide plate 22 connected to one end of the movable post 20 can rotate under the drive of the gear 15. This, along with the pressure plate 19 and friction plate 23 along the workpiece… The outer surface of workpiece 9 is rotated and wound around, so that friction plate 23 and pressure plate 19 can contact and wrap around workpiece 9 to form friction wrapping and locking, and at the same time complete the center positioning function of workpiece 9. When pressure plate 19 is taut, worm gear 16 is closed, and pressure plate 19 is kept locked by the unidirectional irreversible transmission between gear 15 and worm gear 16. At this time, workpiece 9 and fixed ring 10 form a fixed whole. When it is necessary to perform hole processing at different positions on the outer surface of workpiece 9, worm gear 14 can drive gear 13 to drive fixed ring 10 and workpiece 9 to rotate. The unidirectional transmission between gear 13 and worm gear 14 can also ensure that fixed ring 10 is fixed. This design eliminates the need for repeated locking and unlocking of workpiece 9 for hole processing on the outer surface of workpiece 9, greatly reducing the cost of clamping and positioning workpiece 9 and significantly improving processing efficiency.

[0020] Meanwhile, this device utilizes the unidirectional transmission characteristics of gear 13 and worm 14 to form the self-locking property of the fixed ring 10 after it stops moving. It also utilizes the unidirectional transmission characteristics of worm 16 and gear 15 to form the self-locking property of the guide plate 22, adapter plate 21, and movable column 20 after they stop moving. The former ensures that the fixed ring 10 can remain stable, while the latter assists the pressure plate 19 and friction plate 23 in wrapping and locking the workpiece 9 to prevent the pressure plate 19 from loosening. Moreover, the pressure plate 19 can bend and deform to different degrees according to the curvature of the outer surface of the workpiece 9, so that this device can adapt to workpieces 9 of different sizes. By simply controlling the gear 15 to rotate the corresponding angle and keeping the pressure plate 19 taut after locking, workpieces 9 of different sizes can be fixed. Furthermore, the surface contact, friction locking, and wrapping of the workpiece 9 by the pressure plate 19 and friction plate 23 can evenly distribute the clamping force to the surface of the workpiece 9, which not only improves the applicability of the device but also protects the workpiece 9 from damage caused by uneven force during rigid clamping.

[0021] In this embodiment, two sets of support columns 3 are fixedly installed on the top of the two sets of fixed boxes 2, and the slide 5 is slidably installed on the outer surface of the support column 3. A telescopic rod 4 is also installed on the top of the left fixed box 2, and the telescopic end of the telescopic rod 4 is fixedly connected to the slide 5. like Figure 2 As shown, in order to more comprehensively adapt to the processing of holes at different positions on the outer surface of workpiece 9, this device sets the slide 5, telescopic rod 6, motor 7 and drill bit 8 into a horizontally sliding structure, which is supported by the support column 3 so that the drill bit 8 can move along the axis of workpiece 9. Combined with the rotation of workpiece 9, it can directly cover all the holes that need to be processed on the surface of workpiece 9.

[0022] In this embodiment, the friction plate 23 is made of hard rubber, and the pressure plate 19 is made of stainless steel. Both the pressure plate 19 and the friction plate 23 are adapted to abut against the outer surface of the workpiece 9. like Figure 9 As shown, the friction plate 23 directly abuts against the outer surface of the workpiece 9. It is made of hard rubber and can generate huge friction through deformation to assist the pressure plate 19 in wrapping the workpiece 9. The pressure plate 19 is made of stainless steel and can move around the outer surface of the workpiece 9 under the rotation of the adapter plate 21 and the movable column 20 and adapt to the deformation to wrap and fix the workpiece 9.

[0023] In this embodiment, the two sets of pressure plates 19 and friction plates 23 are circumferentially distributed around the axis of the fixed ring 10, and the workpiece 9 is coaxially distributed with the fixed ring 10. like Figure 9 As shown, the two sets of pressure plates 19 are equidistantly distributed around the circumference. Under the action of the positioning column 18 and the movable column 20, they can perfectly wrap around the outer surface of the workpiece 9 and generate wrapping clamping force and friction force on the workpiece 9, thereby fixing the workpiece 9.

[0024] In this embodiment, the guide groove 12 is opened in the middle of the inner wall of the placement groove 11, and the two sets of guide grooves 12 are equidistantly distributed around the axis of the fixing ring 10. like Figure 1 , Figure 9 As shown, the adapter plate 21 is rotatably adapted to the inner wall of the placement groove 11, and the adapter plate 21 is provided on its outer side and is adapted to be snapped into the guide groove 12, which can improve the stability of the adapter plate 21 when rotating.

[0025] In this embodiment, the adapter plate 21 is made of cast iron and fits against the inner wall of the placement groove 11, and the movable column 20 is fixedly connected to the inner side of the adapter plate 21. like Figure 1 , Figure 9 As shown, the adapter plate 21 is stably rotatably mounted inside the placement groove 11 by utilizing the strength of its cast iron, thereby enhancing the stability of the adapter plate 21 during rotation through the guiding fit of the guide plate 22 and the guide groove 12.

[0026] In this embodiment, the inner side of gear 2 15 can slide relative to and fit with the outer surface of the fixing ring 10, and gear 1 13 is fixed to the outer surface of the fixing ring 10 away from gear 2 15 by welding. Gear 2 15 slides onto the outer surface of the fixed ring 10 and is fixedly connected to the guide plate 22, so its rotation will not interfere with the rotation of the fixed ring 10.

[0027] In this embodiment, the contact area between the pressure plate 19, the friction plate 23 and the outer surface of the workpiece 9 is proportional to the size of the workpiece 9, and the positioning column 18 is rotatably installed on the inner wall of the placement groove 11. like Figure 9 As shown, when the size of the workpiece 9 increases, the pressure plate 19 and the friction plate 23 are subjected to greater bending deformation, resulting in a larger contact area, which allows for adaptation to workpieces 9 of different sizes.

[0028] Working principle: When this device is in operation, firstly, the worm gear 16 is activated, which drives the gear 15, guide plate 22, adapter plate 21, and movable column 20 to rotate. Figure 9 As shown, the movable column 20 drives the pressure plate 19 and friction plate 23 to rotate counterclockwise around the axis of the fixed ring 10, opening the space between the two sets of friction plates 23 and pressure plate 19. Then, the workpiece 9 is passed through the two sets of fixed boxes 2. Then, the worm gear 16 is reversed, causing the movable column 20 to drive the pressure plate 19 and friction plate 23 to rotate clockwise around the axis of the fixed ring 10 under the guidance of the guide plate 22. Figure 4 As shown, the two sets of pressure plates 19 drive the friction plates 23 to rotate synchronously around the outer surface of the workpiece 9, causing the friction plates 23 and pressure plates 19 to bend by limiting contact with the outer surface of the workpiece 9 and wrap around the outer surface of the workpiece 9 until the pressure plates 19 remain taut. At this time, the second worm gear 16 closes, and the pressure plates 19 are locked by the unidirectional irreversible transmission between the second gear 15 and the second worm gear 16. Figure 4 As shown, the two sets of pressure plates 19 and friction plates 23 provide the functions of fixing and supporting the workpiece 9 by wrapping it around the workpiece 9; Then, begin drilling, such as Figure 2 As shown, the telescopic rod 6 is activated, which drives the motor 7 and drill bit 8 to move downwards. The motor 7 drives the drill bit 8 to rotate at high speed, thereby completing the drilling. When it is necessary to drill holes at other locations on the outer surface of the workpiece 9, it is not necessary to re-clamp and fix the workpiece 9. Figure 1 , Figure 4 and Figure 6 As shown, start the worm gear 14, which drives the gear 13 and the fixed ring 10 to rotate synchronously. The workpiece 9 is rotated and aligned with the drill bit 8, or the slide block 5 is moved horizontally by the telescopic rod 4 so that the drill bit 8 can cover the outer surface of the workpiece 9.

[0029] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A machine for processing holes on the surface of circular steel pipes for automobile frames, comprising a base (1), characterized in that, Also includes: The fixed box (2) is set in two horizontally symmetrical sets and installed on the top of the base (1). The fixed box (2) is equipped with a worm gear (14). The top of the two fixed boxes (2) is slidably equipped with a slide block (5) and a telescopic rod (6). The telescopic end of the telescopic rod (6) is fixedly equipped with a motor (7). The output shaft of the motor (7) is fixedly connected to a drill bit (8). A fixing ring (10) is rotatably mounted on the inner wall of the fixed box (2). A gear two (15) is mounted on the outer surface of the fixing ring (10). The worm gear one (14) meshes with the gear two (15). A placement groove (11) is opened inside the fixing ring (10). Two sets of guide grooves (12) are opened on the inner wall of the placement groove (11). Two sets of positioning columns (18) and movable columns (20) are rotatably arranged on the inner wall of the placement groove (11). A pressure plate (19) is movably sleeved on the outer surface of the positioning column (18) and the movable column (20). A friction plate (23) is fixedly connected to the inner side of the pressure plate (19) and the friction plate (23). The workpiece (9) is clamped between the inner sides of the pressure plate (19) and the friction plate (23). An adapter plate (21) is fixedly connected to the end of the pressure plate (19) away from the positioning post (18). A guide plate (22) is provided on the outer side of the adapter plate (21) and is snapped into the guide groove (12). A gear two (15) is fixedly connected to the outer side of the guide plate (22). A protective cover (17) is installed on the outer side of the fixing ring (10). A worm gear two (16) that meshes with the gear two (15) is installed inside the protective cover (17).

2. The equipment for processing holes on the surface of circular steel tubes for automobile frames according to claim 1, characterized in that, Two sets of support columns (3) are fixedly installed on the top of the two sets of fixed boxes (2). The slide (5) is slidably installed on the outer surface of the support column (3). A telescopic rod (4) is also installed on the top of the fixed box (2) on the left side. The telescopic end of the telescopic rod (4) is fixedly connected to the slide (5).

3. The equipment for processing holes on the surface of circular steel tubes for automobile frames according to claim 2, characterized in that, The friction plate (23) is made of hard rubber, and the pressure plate (19) is made of stainless steel. Both the pressure plate (19) and the friction plate (23) are adapted to abut against the outer surface of the workpiece (9).

4. The equipment for processing holes on the surface of circular steel tubes for automobile frames according to claim 3, characterized in that, The two sets of pressure plates (19) and friction plates (23) are equidistantly distributed around the axis of the fixed ring (10), and the workpiece (9) is coaxially distributed with the fixed ring (10).

5. The equipment for processing holes on the surface of circular steel tubes for automobile frames according to claim 4, characterized in that, The guide groove (12) is located in the middle of the inner wall of the placement groove (11), and the two sets of guide grooves (12) are equidistantly distributed around the axis of the fixing ring (10).

6. The equipment for processing holes on the surface of circular steel tubes for automobile frames according to claim 5, characterized in that, The adapter plate (21) is made of cast iron and fits against the inner wall of the placement groove (11). The movable column (20) is fixedly connected to the inner side of the adapter plate (21).

7. The equipment for processing holes on the surface of circular steel tubes for automobile frames according to claim 6, characterized in that, The inner side of the second gear (15) can slide relative to and be adapted to the outer surface of the fixed ring (10). The first gear (13) is fixed to the outer surface of the fixed ring (10) away from the second gear (15) by welding.

8. The equipment for processing holes on the surface of circular steel tubes for automobile frames according to claim 7, characterized in that, The contact area between the pressure plate (19), friction plate (23) and the outer surface of the workpiece (9) is proportional to the size of the workpiece (9), and the positioning column (18) is rotatably installed on the inner wall of the placement groove (11).

Images