Pipe fitting interior grinding machine tool

Abstract

The invention discloses a pipe fitting interior grinding machine tool, and relates to the technical field of grinding machine tools. The device comprises a rack, a main shaft is rotationally installed on the rack, a driving motor connected with the main shaft is fixedly installed in the rack, and the end of the main shaft is fixedly connected with a three-jaw chuck located outside the rack; and the movable clamping part comprises a transverse frame which is horizontally installed on the rack in a sliding mode, the upper side of one end of the transverse frame is fixedly connected with an expansion tip which is arranged opposite to the three-jaw chuck, and a movable plate is arranged in the transverse frame in a sliding and penetrating mode in the length direction of the transverse frame. Through the design of the expansion tip and the expansion umbrella piece, the pipe fitting grinding device can adapt to pipe fittings of different sizes, stable clamping is achieved, the pipe fittings are prevented from shaking in the grinding process, the grinding precision and quality are improved, meanwhile, the movable grinding part is arranged in the movable clamping part, the extension distance of the telescopic grinding knife can be increased, and the grinding efficiency is improved. Therefore, the pipe fitting length in a larger range can be adapted, and the adaptability of the device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of grinding machine tools, and in particular to a pipe internal grinding machine tool. Background Art

[0002] Pipe fittings are widely used in industrial production, such as petroleum, chemical industry, machinery manufacturing and other fields. The quality of their internal surface directly affects the performance and service life of pipe fittings. In the processing of pipe fittings, internal grinding is one of the key processes, which is used to remove burrs, welds and other defects on the inner wall of pipe fittings and improve the finish and precision of the inner wall.

[0003] The existing internal grinding equipment for pipe fittings has the following problems:

[0004] Poor clamping stability: Traditional equipment has a relatively simple way of clamping pipe fittings, relying only on a chuck or vise to clamp one end. The clamping is unstable and can easily cause the pipe fittings to shake during the grinding process, affecting the grinding accuracy and quality.

[0005] Low grinding efficiency: The grinding device of the existing grinding equipment has a complex structure and is inconvenient to adjust. It is impossible to flexibly adjust the position and angle of the grinding knife according to the actual condition of the inner wall of the pipe, resulting in low grinding efficiency and unable to meet the needs of large-scale production.

[0006] Limited applicability: Existing equipment has high requirements on the length parameters of pipe fittings and cannot grind the middle part of longer pipe fittings.

[0007] In order to solve the above problems, the present invention proposes a pipe internal grinding machine. Summary of the invention

[0008] The purpose of this application is to solve the problems in the above-mentioned background technology, and provide a pipe internal grinding machine.

[0009] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0010] A pipe internal grinding machine tool, comprising:

[0011] A frame, on which a main shaft is rotatably mounted, a driving motor connected to the main shaft is fixedly mounted inside the frame, and a three-jaw chuck located outside the frame is fixedly connected to the end of the main shaft;

[0012] The mobile clamping part comprises a horizontal frame horizontally slidably mounted on the frame, an expansion top arranged opposite to the three-jaw chuck is fixedly connected to the upper side of one end of the horizontal frame, a mobile plate is slidably penetrated in the horizontal frame along its length direction, a resistance member for resisting the horizontal frame and moving together is installed at one end of the mobile plate, a fixing member for fixing the position of the horizontal frame is installed on the frame, and a transmission member for driving the mobile plate to move horizontally is installed between the mobile plate and the main shaft;

[0013] The mobile grinding part comprises a support frame fixedly connected to the mobile plate, the support frame is threadedly connected with a bearing rod movably penetrating the expansion top, and the end of the bearing rod is detachably mounted with a telescopic grinder for contacting the inner wall of the pipe.

[0014] Furthermore, the expansion tip includes a support seat fixedly connected to the horizontal frame, a fixed horizontal tube is constructed at the upper end of the support seat, a rotating tube is rotatably installed at one end of the fixed horizontal tube, a conical resistance block is constructed at the end of the rotating tube, an expansion umbrella piece is connected between the conical resistance block and the rotating tube, and the bearing rod movably passes through the rotating tube and the conical resistance block.

[0015] Furthermore, the expansion umbrella piece includes a plurality of fan-shaped arc pieces hinged in a circular array along the edge of a conical abutment block, a threaded tube is constructed in the middle of the rotating tube, a movable screw button is threadedly sleeved on the threaded tube, one end of the movable screw button is rotatably connected to a movable ring slidably sleeved on the rotating tube, a connecting rod is hinged between the inner side of the fan-shaped arc piece and the movable ring, and a fixed screw button is threadedly sleeved on the threaded tube and abuts against the movable screw button.

[0016] Furthermore, gaps are configured between the expansion parachute pieces, and a feed trough communicating with one of the gaps is configured on the conical abutment block.

[0017] Furthermore, the outer surfaces of the conical abutment block and the fan-shaped arc piece are both constructed with a plurality of limiting convex strips for abutting against the end of the pipe fitting.

[0018] Furthermore, the resistance member includes a through groove constructed on it along the width direction of the movable plate, two symmetrically arranged U-shaped blocks are slidably installed in the through groove, two fixed blocks located in the U-shaped block are constructed in the through groove, a pushing spring is connected between the fixed block and the inner end of the U-shaped block, and a pushing member for pushing the two U-shaped blocks away from each other is installed in the middle of the through groove.

[0019] Furthermore, the opposite ends of the two U-shaped blocks are constructed with beveled surfaces, the end of the movable plate is constructed with a movable groove that passes through the middle of the through groove, the pushing member includes a rectangular flip block rotatably installed in the movable groove, the bottom end of the rectangular flip block is constructed with a triangular block for abutting against the two beveled surfaces, and a flip handle is vertically constructed on the triangular block.

[0020] Furthermore, the fixing part includes a strip-shaped tooth groove constructed on one side of the transverse frame, a movable screw is threadedly installed on one side of the frame, one end of the movable screw is fixedly connected to a rotating handle, and the other end of the movable screw is rotatably connected to a limit block slidably installed in the frame, and the end of the limit block is constructed with a limit tooth groove meshing with the strip-shaped tooth groove.

[0021] Furthermore, the transmission member includes a worm connected between the main shaft and the driving motor, a reducer is fixedly installed in the frame, a worm wheel meshing with the worm is fixedly connected to one of the rotating shafts of the reducer, a transmission gear is fixedly connected to the other rotating shaft of the reducer, and a rack meshing with the transmission gear is constructed on the movable plate along its length direction.

[0022] Furthermore, the end of the bearing rod is constructed with a plurality of bearing grooves perpendicular to the length direction of the bearing rod, and the telescopic sharpener includes a support spring fixedly connected to the bottom of the bearing groove, a sharpening block is slidably inserted in one of the bearing grooves, a vertical groove is constructed on the sharpening block, and a limiting bolt that movably penetrates the vertical groove is installed on the threaded portion of the bearing rod.

[0023] The beneficial effects of this application are as follows:

[0024] The present application can adapt to pipes of different sizes and achieve stable clamping through the design of the expansion tip and the expansion umbrella piece, thereby preventing the pipes from shaking during the grinding process and improving the grinding accuracy and quality. At the same time, by arranging the mobile grinding part inside the mobile clamping part, the extension distance of the telescopic grinder can be increased, thereby adapting to a wider range of pipe lengths and increasing the adaptability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structural diagram of this application;

[0026] Figure 2 It is a half-section diagram of the three-dimensional structure of the present application;

[0027] Figure 3 It is a partial three-dimensional structural diagram of this application;

[0028] Figure 4 It is another partial three-dimensional structure diagram of the present application;

[0029] Figure 5 This application Figure 4 Partial three-dimensional structure diagram;

[0030] Figure 6 This application Figure 5 Half-section view of the three-dimensional structure;

[0031] Figure 7 It is a three-dimensional structural diagram of the conflicting member of this application;

[0032] Figure 8 This application Figure 7 A cross-sectional view of the local three-dimensional structure;

[0033] Fig. 9 This application Figure 8 The enlarged view of point A in the middle;

[0034] Fig.10 It is a partial three-dimensional structural cross-sectional view of the present application;

[0035] Fig.11 This application Fig.10 The enlarged view of point B in the middle;

[0036] Fig.12 This is a cross-sectional view of the three-dimensional structure of the telescopic sharpener of the present application;

[0037] Figure numerals: 1, frame; 101, spindle; 102, drive motor; 103, three-jaw chuck; 2, mobile clamping part; 201, horizontal frame; 202, mobile plate; 2021, movable groove; 3, expansion top; 301, support seat; 302, fixed horizontal tube; 303, rotating tube; 3031, threaded tube; 304, conical interference block; 3041, feed chute; 3042, limiting convex strip; 305, expansion umbrella piece; 3051, fan-shaped arc piece; 3052, mobile screw button; 3053, mobile ring; 3054, connecting rod; 3055, fixed screw button; 4, interference piece; 401, through groove; 402, U-shaped block; 4021, bevel surface ; 403, fixed block; 404, push spring; 405, push member; 4051, rectangular flip block; 4052, triangular block; 4053, flip handle; 5, fixed member; 501, strip tooth groove; 502, movable screw; 503, rotating handle; 504, limit block; 505, limit tooth groove; 6, transmission member; 601, worm; 602, reducer; 603, worm wheel; 604, transmission gear; 605, rack; 7, mobile grinding part; 701, support frame; 702, bearing rod; 7021, bearing groove; 8, telescopic sharpening knife; 801, support spring; 802, sharpening knife block; 803, vertical groove; 804, limit bolt. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0039] like Figure 1-Figure 7 As shown, a pipe internal grinding machine tool proposed in one embodiment of the present application includes:

[0040] The frame 1 has a main shaft 101 rotatably mounted on it, a driving motor 102 connected to the main shaft 101 is fixedly mounted inside the frame 1, and a three-jaw chuck 103 located outside the frame 1 is fixedly connected to the end of the main shaft 101. The frame 1 is the basic supporting structure of the entire machine tool, which is made of high-strength steel and has sufficient rigidity and stability. The upper surface of the frame 1 is processed with a flat mounting surface for mounting other control components. The main shaft 101 is rotatably mounted on the frame 1 through a bearing seat, and one end of the main shaft 101 extends out of the frame 1. The three-jaw chuck 103 is fixedly connected to its end for clamping one end of the pipe fitting. The driving motor 102 is connected to the main shaft 101 through a coupling to provide a power source for the machine tool. The rotation speed can be adjusted according to actual needs to adapt to the grinding of different pipe fittings.

[0041] The mobile clamping part 2 includes a horizontal frame 201 mounted on the frame 1 for horizontal sliding. An expansion top 3 arranged opposite to the three-jaw chuck 103 is fixedly connected to the upper side of one end of the horizontal frame 201. A movable plate 202 is slidably penetrated in the horizontal frame 201 along its length direction. An abutment 4 for abutting against the horizontal frame 201 and moving together is installed at one end of the movable plate 202. A fixing part 5 for fixing the position of the horizontal frame 201 is installed on the frame 1. A transmission part 6 for driving the movable plate 202 to move horizontally is installed between the movable plate 202 and the spindle 101. The horizontal frame 201 slides in the horizontal direction of the frame 1. The sliding track adopts a dovetail groove structure to ensure the stability and accuracy of the sliding. The expansion top 3 is used to abut against the other end of the pipe fitting. When the abutment 4 abuts against the horizontal frame 201, the frame 1 is provided with a fixing part 5 for fixing the position of the horizontal frame 201. A transmission part 6 for driving the movable plate 202 to move horizontally is installed between the movable plate 202 and the spindle 101. The horizontal frame 201 slides in the horizontal direction of the frame 1. The sliding track adopts a dovetail groove structure to ensure the stability and accuracy of the sliding. The expansion top 3 is used to abut against the other end of the pipe fitting. When the cross frame 201 is in contact with the cross frame 201, the movable plate 202 is connected to the main shaft 101 through the transmission member 6, so that the main shaft 101 can rotate and drive the movable plate 202 to move horizontally. At the same time, the cross frame 201 is pushed toward the frame 1 by the contact member 4. At this time, the expansion top 3 approaches the three-jaw chuck 103 to achieve the clamping of the pipe fitting. After the pipe fitting is clamped, the position of the cross frame 201 needs to be fixed by the fixing member 5, and then the contact with the cross frame 201 is released by the contact member 4. The movable plate 202 can continue to reciprocate horizontally without affecting the cross frame 201. When the pipe fitting needs to be released, it is only necessary to release the fixation of the cross frame 201 by the fixing member 5 to release the clamping, and the operation is convenient and quick.

[0042] The mobile grinding part 7 includes a support frame 701 fixedly connected to the mobile plate 202, a bearing rod 702 movably penetrating the expansion top 3 is threadedly connected to the support frame 701, and a telescopic grinder 8 for contacting the inner wall of the pipe fitting is detachably installed at the end of the bearing rod 702. The telescopic grinder 8 is installed at the end of the bearing rod 702. It should be noted that the bearing rod 702 can be replaced according to the length of the pipe fitting. When the mobile plate 202 pushes the horizontal frame 201 to move, the pipe fitting is contacted and clamped by the expansion top 3, and the telescopic grinder 8 needs to be at the end of the pipe fitting close to the three-jaw chuck 103. At this time, when the mobile plate 202 moves again, it will drive the telescopic grinder 8 to gradually grind the inner wall of the pipe fitting;

[0043] The present application adopts the design of the expansion tip 3 and the three-jaw chuck 103, which can clamp the two ends of pipes of different sizes, making it more stable and preventing the pipes from shaking during the grinding process, thereby improving the grinding accuracy and quality. At the same time, by using the load-bearing rod 702 to penetrate the expansion tip 3, the moving range of the telescopic grinder 8 can be increased, making the device more suitable for the inner wall grinding operation of longer pipes. At the same time, the overall operation is also more convenient, without the need for repeated manual switching of operating equipment, thus saving manpower.

[0044] like Figure 1-Figure 4 As shown, in some embodiments, the expansion top 3 includes a support seat 301 fixedly connected to the cross frame 201, a fixed cross tube 302 is configured at the upper end of the support seat 301, a rotating tube 303 is rotatably mounted at one end of the fixed cross tube 302, a conical abutment block 304 is configured at the end of the rotating tube 303, an expansion umbrella piece 305 is connected between the conical abutment block 304 and the rotating tube 303, a bearing rod 702 movably penetrates the rotating tube 303 and the conical abutment block 304, the support seat 301 is made of high-strength alloy material, has good rigidity and durability, and the fixed cross tube 302 and the support seat 301 are integrally formed. The rotating tube 303 is connected to the fixed horizontal tube 302 through a bearing and can rotate flexibly. When the pipe is clamped between the three-jaw chuck 103 and the expansion top 3, the rotating tube 303 can rotate with the pipe. The conical interference block 304 and the rotating tube 303 are connected by welding, and the structure is firm. The expansion umbrella piece 305 is mainly used to expand the conical interference block 304. When the diameter of the pipe is too large, the expansion umbrella piece 305 can be expanded or contracted to adapt to the interference operation of the ends of pipes of different sizes, so as to firmly clamp the pipe, increase flexibility and improve the adaptability of the device.

[0045] like Figure 4-Figure 6As shown, in some embodiments, the expansion umbrella piece 305 includes a plurality of fan-shaped arc pieces 3051 hinged in an array along the circumference of the edge of the conical abutment block 304, a threaded tube 3031 is configured in the middle of the rotating tube 303, a moving screw button 3052 is threadedly sleeved on the threaded tube 3031, one end of the moving screw button 3052 is rotatably connected to a moving ring 3053 slidably sleeved on the rotating tube 303, a connecting rod 3054 is hinged between the inner side of the fan-shaped arc piece 3051 and the moving ring 3053, a fixed screw button 3055 is threadedly sleeved on the threaded tube 3031 and abuts against the moving screw button 3052, the expansion umbrella piece 305 includes a plurality of fan-shaped arc pieces 3051 hinged in an array along the circumference of the edge of the conical abutment block 304, and the number of the fan-shaped arc pieces 3051 is set according to actual needs, for example, it can be set to three or five to ensure The expansion stability and uniformity are improved. When it is necessary to adapt to the clamping of pipes with larger diameters, the movable screw button 3052 can be rotated while fixing the rotating tube 303, so that the movable screw button 3052 and the threaded tube 3031 are threadedly matched, so that the movable ring 3053 slides toward the conical interference block 304. During the movement, the connecting rod 3054 will drive the fan-shaped arc piece 3051 to expand outward, so as to adjust the expansion size of the expansion umbrella piece 305, adapt to the interference clamping operation of pipes of different sizes, and increase the flexibility of the device. The fixed screw button 3055 is used to tightly contact the movable screw button 3052, limit the position of the movable screw button 3052 on the threaded tube 3031, so that it will not rotate due to the rotation of the rotating tube 303, avoid the expansion umbrella piece 305 from shrinking, and increase stability and safety.

[0046] like Figure 5 As shown, in some embodiments, gaps are constructed between each pair of expansion umbrella pieces 305, and a feed chute 3041 connected to one of the gaps is constructed on the conical resistance block 304. Gaps are constructed between each pair of expansion umbrella pieces 305. On the one hand, these gaps are used to accommodate burrs or impurities at the ends of the pipe fittings to avoid damage to the pipe fittings during the expansion process. On the other hand, they can be connected to the feed chute 3041, which can conveniently guide the burrs or impurities ground out of the inside of the pipe fittings to the outside, thereby ensuring the grinding accuracy.

[0047] like Figure 5 As shown, in some embodiments, the outer surfaces of the conical resistance block 304 and the fan-shaped arc piece 3051 are constructed with a plurality of limiting ridges 3042 for resisting the ends of the pipe fittings. It should be noted that the limiting ridges 3042 are constructed of wear-resistant materials, which can effectively resist the ends of the pipe fittings to increase friction, prevent the pipe fittings from shifting during the grinding process, and improve the grinding accuracy and quality.

[0048] like Figure 7-Figure 9As shown, in some embodiments, the resisting member 4 includes a through slot 401 constructed on the movable plate 202 along the width direction thereof, two symmetrically arranged U-shaped blocks 402 are slidably installed in the through slot 401, two fixed blocks 403 located in the U-shaped blocks 402 are constructed in the through slot 401, a pushing spring 404 is connected between the fixed block 403 and the inner end of the U-shaped block 402, and a pushing member 405 for pushing the two U-shaped blocks 402 away from each other is installed in the middle of the through slot 401. It should be noted that the resisting member 4 is normally closed. In the retracted state, the two U-shaped blocks 402 are retracted inside the movable plate 202 by the pulling force of the push spring 404. When the pipe needs to be clamped, the movable plate 202 will push the cross frame 201 to move synchronously. At this time, the push member 405 can be used to drive the two U-shaped blocks 402 to move away from each other to protrude from the through groove 401, thereby abutting against the end of the cross frame 201, so that the movable plate 202 pushes the cross frame 201 to move synchronously. No additional driving force is needed to drive the cross frame 201 to move, flexible switching is achieved, and equipment cost is saved.

[0049] like Figure 7-Figure 9 As shown, in some embodiments, the opposite ends of the two U-shaped blocks 402 are both configured with beveled surfaces 4021, the end of the movable plate 202 is configured with an active groove 2021 that runs through the middle of the through groove 401, and the pushing member 405 includes a rectangular flip block 4051 rotatably installed in the active groove 2021, and the bottom end of the rectangular flip block 4051 is configured with a triangular block 4052 for contacting the two beveled surfaces 4021, and a flip handle 4053 is vertically configured on the triangular block 4052, and the connection form of the rectangular flip block 4051 and the flip handle 4053 is L-shaped. When the rectangular flip block 4051 is flipped to a vertical state, the flip handle 4053 is in the active groove 2021, leaving only the end outside the movable plate 202, and at this time, the two U-shaped blocks 402 are pressed against each other by the elastic force of the push spring 404. The two U-shaped blocks 402 are close to each other, and the beveled surfaces 4021 at the upper ends of the two are combined into a triangular groove. At this time, the triangular block 4052 is in contact with one side of the two U-shaped blocks 402 without the action of external force and cannot be turned over. The personnel need to press down the turning handle 4053 with force so that the sharp corners of the triangular block 4052 gradually squeeze the two U-shaped blocks 402 apart by contacting the two beveled surfaces 4021 until the rectangular turning block 4051 is in a horizontal state. At this time, the planes on both sides of the rectangular turning block 4051 are clamped between the two U-shaped blocks 402 and are limited by friction, so as to fix the protruding state of the two U-shaped blocks 402, so as to facilitate the synchronous movement of the horizontal frame 201. Pushing the turning handle 4053 upward again can make the two U-shaped blocks 402 automatically approach and be retracted into the movable plate 202, with flexible switching and convenient and fast operation.

[0050] like Figure 10-11As shown, in some embodiments, the fixing member 5 includes a strip-shaped tooth groove 501 constructed on one side of the horizontal frame 201, a moving screw 502 is threadedly installed on one side of the frame 1, one end of the moving screw 502 is fixedly connected to a rotating handle 503, and the other end of the moving screw 502 is rotatably connected to a limit block 504 slidably installed in the frame 1, and the end of the limit block 504 is constructed with a limit tooth groove 505 meshing with the strip-shaped tooth groove 501, and the moving screw 502 is connected to the frame 1 through a thread. The cross frame 201 moves axially along the main shaft 101 of the frame 1, and the moving screw 502 can move in the vertical direction of the axis of the frame 1 through the thread stroke, so as to drive the limit block 504 to move toward the side of the cross frame 201. When the limit tooth groove 505 at the end of the limit block 504 is in contact with the strip tooth groove 501, the fixed position of the cross frame 201 can be ensured to be accurate and reliable. Compared with the traditional friction fixation, the meshing between the grooves is more stable, thereby ensuring the stability of the clamping of the pipe fittings.

[0051] like Figure 2-Figure 3 As shown, in some embodiments, the transmission member 6 includes a worm 601 connected between the main shaft 101 and the driving motor 102, a reducer 602 is fixedly installed in the frame 1, a worm wheel 603 meshing with the worm 601 is fixedly connected to one of the rotating shafts of the reducer 602, a transmission gear 604 is fixedly connected to the other rotating shaft of the reducer 602, and a rack 605 meshing with the transmission gear 604 is constructed on the movable plate 202 along its length direction. The worm 601 is connected to the main shaft 101 through a coupling, and can transmit the power of the driving motor 102 to the main shaft 101. At the same time, the power direction is converted through the transmission of the worm wheel 603 to convert the power The force is transmitted to one end of the reducer 602, and the reducer 602 further reduces the rotation speed and then transmits it to the transmission gear 604. The meshing of the transmission gear 604 and the rack 605 is used to transmit the power of the reducer 602 to the movable plate 202, so as to realize the horizontal movement of the movable plate 202. A single power can synchronously drive the spindle 101 to rotate back and forth, and at the same time drive the movable plate 202 to move back and forth, so as to realize the grinding operation while the pipe is rotating, and ensure the synchronization of the operation. The setting of the reducer 602 can flexibly change the transmission ratio, and control the feed speed of the grinding operation without changing the rotation speed of the spindle 101, thereby increasing the flexibility of the device.

[0052] like Fig.12As shown, in some embodiments, the end of the bearing rod 702 is constructed with a plurality of bearing grooves 7021 perpendicular to the length direction of the bearing rod 702, and the telescopic sharpener 8 includes a support spring 801 fixedly connected to the bottom of the bearing groove 7021, a sharpening block 802 is slidably inserted in one of the bearing grooves 7021, and a vertical groove 803 is constructed on the sharpening block 802, and a limiting bolt 804 that movably penetrates the vertical groove 803 is installed on the bearing rod 702 through a thread, and a plurality of bearing grooves 7021 perpendicular to the length direction of the bearing rod 702 are constructed at the end of the bearing rod 702. The number of the bearing grooves 7021 is set according to actual needs, and different telescopic sharpeners 8 can be installed in different bearing grooves 7021 to achieve synchronization. Multiple grinding operations are performed to meet different grinding requirements and save working procedures. A support spring 801 is arranged in the bearing groove 7021 to provide elastic force, so that the grinding block 802 can always contact the inner wall of the pipe fitting, and can smoothly enter the interior of the pipe fitting when clamping the pipe fitting. The vertical groove 803 constructed on the grinding block 802 is used for the penetration of the limiting bolt 804 to prevent the grinding block 802 from easily detaching from the bearing rod 702. At the same time, the limiting bolt 804 can move relatively in the vertical groove 803 and can limit the telescopic distance of the grinding block 802, so as to make the grinding depth of the inner wall of the pipe fitting by the grinding block 802, so as to control the grinding size of the inner wall of the pipe fitting and increase the functionality of the device.

[0053] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pipe internal grinding machine, characterized in that: include: A frame (1), a main shaft (101) being rotatably mounted on the frame (1), a driving motor (102) connected to the main shaft (101) being fixedly mounted inside the frame (1), and a three-jaw chuck (103) located outside the frame (1) being fixedly connected to an end of the main shaft (101); The movable clamping part (2) comprises a transverse frame (201) horizontally slidably mounted on the frame (1), an expansion top (3) arranged opposite to the three-jaw chuck (103) being fixedly connected to the upper side of one end of the transverse frame (201), a movable plate (202) slidingly passing through the transverse frame (201) along its length direction, a resisting member (4) for resisting the transverse frame (201) and moving together is mounted on one end of the movable plate (202), a fixing member (5) for fixing the position of the transverse frame (201) is mounted on the frame (1), and a transmission member (6) for driving the movable plate (202) to move horizontally is mounted between the movable plate (202) and the main shaft (101); The movable grinding part (7) comprises a support frame (701) fixedly connected to the movable plate (202), a bearing rod (702) movably penetrating the expansion top (3) being threadedly connected to the support frame (701), and a telescopic grinding knife (8) for contacting the inner wall of the pipe being detachably mounted at the end of the bearing rod (702).

2. A pipe internal grinding machine according to claim 1, characterized in that: The expansion tip (3) comprises a support seat (301) fixedly connected to the transverse frame (201); a fixed transverse tube (302) is constructed at the upper end of the support seat (301); a rotating tube (303) is rotatably mounted at one end of the fixed transverse tube (302); a conical abutment block (304) is constructed at the end of the rotating tube (303); an expansion umbrella piece (305) is connected between the conical abutment block (304) and the rotating tube (303); and the bearing rod (702) movably penetrates the rotating tube (303) and the conical abutment block (304).

3. A pipe internal grinding machine according to claim 2, characterized in that: The expansion umbrella piece (305) comprises a plurality of fan-shaped arc pieces (3051) hinged in a circular array along the edge of the conical abutment block (304); a threaded tube (3031) is constructed in the middle of the rotating tube (303); a movable screw button (3052) is threadedly sleeved on the threaded tube (3031); one end of the movable screw button (3052) is rotatably connected to a movable ring (3053) slidably sleeved on the rotating tube (303); a connecting rod (3054) is hinged between the inner side of the fan-shaped arc piece (3051) and the movable ring (3053); and a fixed screw button (3055) is threadedly sleeved on the threaded tube (3031) and abuts against the movable screw button (3052).

4. A pipe internal grinding machine according to claim 2, characterized in that: Gaps are formed between the expansion umbrella pieces (305), and a feed trough (3041) communicating with one of the gaps is formed on the conical abutment block (304).

5. The pipe internal grinding machine according to claim 2, characterized in that: The outer surfaces of the conical abutment block (304) and the fan-shaped arc piece (3051) are both configured with a plurality of limiting convex strips (3042) for abutting against the end of the pipe.

6. The pipe internal grinding machine according to claim 1, characterized in that: The resisting member (4) comprises a through groove (401) constructed on the movable plate (202) along the width direction thereof, two symmetrically arranged U-shaped blocks (402) are slidably installed in the through groove (401), two fixed blocks (403) located in the U-shaped blocks (402) are constructed in the through groove (401), a pushing spring (404) is connected between the fixed block (403) and the inner end of the U-shaped block (402), and a pushing member (405) for pushing the two U-shaped blocks (402) away from each other is installed in the middle of the through groove (401).

7. A pipe internal grinding machine according to claim 6, characterized in that: The opposite ends of the two U-shaped blocks (402) are both constructed with beveled surfaces (4021), the end of the movable plate (202) is constructed with a movable groove (2021) penetrating the middle of the through groove (401), the pushing member (405) comprises a rectangular flip block (4051) rotatably mounted in the movable groove (2021), the bottom end of the rectangular flip block (4051) is constructed with a triangular block (4052) for contacting the two beveled surfaces (4021), and a flip handle (4053) is vertically constructed on the triangular block (4052).

8. The pipe internal grinding machine according to claim 1, characterized in that: The fixing member (5) comprises a strip-shaped tooth groove (501) constructed on one side of the transverse frame (201); a movable screw rod (502) is threadedly installed through one side of the frame (1); one end of the movable screw rod (502) is fixedly connected to a rotating handle (503); the other end of the movable screw rod (502) is rotatably connected to a limit block (504) slidably installed in the frame (1); and the end of the limit block (504) is constructed with a limit tooth groove (505) meshing with the strip-shaped tooth groove (501).

9. The pipe internal grinding machine according to claim 1, characterized in that: The transmission member (6) comprises a worm (601) connected between the main shaft (101) and the driving motor (102); a reducer (602) is fixedly installed in the frame (1); a worm wheel (603) meshing with the worm (601) is fixedly connected to one of the rotating shafts of the reducer (602); a transmission gear (604) is fixedly connected to the other rotating shaft of the reducer (602); and a rack (605) meshing with the transmission gear (604) is constructed on the movable plate (202) along its length direction.

10. The pipe internal grinding machine according to claim 1, characterized in that: The end of the bearing rod (702) is configured with a plurality of bearing grooves (7021) perpendicular to the length direction of the bearing rod (702); the telescopic sharpener (8) comprises a support spring (801) fixedly connected to the bottom of the bearing groove (7021); a sharpening block (802) is slidably inserted into one of the bearing grooves (7021); a vertical groove (803) is configured on the sharpening block (802); and a limiting bolt (804) that movably penetrates the vertical groove (803) is threadedly installed on the bearing rod (702).

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