Pipe end machining equipment

Abstract

The invention provides pipe end machining equipment, and relates to the technical field of pipe body machining equipment.The pipe end machining equipment comprises a base, and a clamping device suitable for clamping a pipe body is installed on the base; the sliding seat is installed on the base in a sliding mode in the Z direction; the cutter shaft is rotatably installed on the sliding seat, the cutter shaft is provided with a shaft hole, and when the pipe body is clamped, the axis of the shaft hole can coincide with the axis of the pipe body; the main shaft is in sliding fit with the cutter shaft, the front end of the main shaft is connected with an ejector rod, and at least one part of the ejector rod is slightly smaller than the inner hole of the pipe body in size so as to be supported in the inner hole of the pipe body; axial jacking force is applied to the rear end of the cutter shaft, and when the front end of the tube body is inserted into the insertion part of the ejector rod and is jacked in place, jacking force is applied to the rear end of the main shaft through the jacking device, so that a part of the conical surface of the ejector rod is jacked into an inner hole of the spiral finned tube, and the wall thickness of the machined tube body is relatively uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of tube body processing equipment, and specifically to a tube end processing equipment capable of uniformly processing the wall thickness of a tube body. Background Art

[0002] A spiral finned tube is a high-efficiency heat transfer element with spiral fins. Its heat transfer area is several times that of a smooth tube, which can strengthen heat transfer, reduce flow resistance, and reduce metal consumption, thereby improving the economy and operation reliability of heat exchange equipment. It is widely used in boilers. However, when using a high-frequency welded spiral finned tube as a heat exchange element, the thermal resistance is large and the heat exchange efficiency is low. Therefore, an integral spiral finned tube formed by rolling has the advantages of high heat transfer efficiency and not being prone to ash accumulation;

[0003] For example, a Chinese invention patent with the authorization announcement number CN208124955U discloses an integral spiral finned tube. The integral spiral finned tube includes a tube body 10 and spiral fins 11 integrally formed on the outside of the tube body 10. The tube body 10 has an inner hole 12. In order to facilitate the assembly of the integral spiral finned tube onto a boiler, the front end of the tube body 10 is a smooth tube, and the end face of the tube body adopts a fillet 13 for transition;

[0004] The integral spiral finned tube is generally processed by a lathe. Refer to Figures 1A to 1D , first, an integral spiral finned tube is clamped by a hydraulic chuck on a lathe. First, a rough tool is used to remove part of the spiral fins 11 at one end of the integral spiral finned tube according to the design requirements, exposing a predetermined smooth tube length. Then, according to the actual designed wall thickness, a finishing tool is used to remove a certain thickness of the tube wall from the outside of the smooth tube. Finally, a fillet 13 is cut at one end of the integral spiral finned tube;

[0005] Since the length of the rolled spiral finned tube is generally 7 to 10 meters, and in order to adapt to a larger volume boiler, the rolled spiral finned tube even reaches about 15 meters. Therefore, during the actual processing of the end of the spiral finned tube, when the position near one end of the spiral finned tube is clamped and driven by a motor to rotate at a high speed, the processed end of the spiral finned tube will shake slightly, resulting in uneven wall thickness of the processed spiral finned tube, that is, lathe processing will cause uneven wall thickness of the tube body, large error, and the boiler will burst and leak during operation, posing a safety hazard. Summary of the Invention

[0006] The purpose of the present invention is to provide a tube end processing equipment, aiming to solve the problem that in the prior art, when the rolled spiral finned tube rotates at a high speed, the wall thickness of the tube end processed by a turning tool is uneven, resulting in burst and leakage of the tube during the operation of the boiler.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A pipe end processing device, including a base, on which a clamping device suitable for clamping a pipe body is installed; a sliding seat, slidably installed on the base along the Z direction; a tool shaft, rotatably installed on the sliding seat, the tool shaft having a shaft hole, when the pipe body is clamped, the axis of the shaft hole can coincide with the axis of the pipe body; a main shaft, slidably cooperating with the tool shaft, a ejector rod is connected to the front end of the main shaft, at least a part of the ejector rod has a size slightly smaller than the size of the inner hole of the pipe body to support in the inner hole of the pipe body; a tightening device, arranged at the rear end of the main shaft, so as to apply an axial tightening force to the rear end of the main shaft, so that the main shaft is clamped between the tightening device and the pipe body; a cutting assembly, fixedly installed at the front end of the tool shaft; a rotary driving device, installed on the sliding seat, the rotary driving device drives the tool shaft to rotate, so that the cutting assembly rotates around the axis of the pipe body; a Z-direction moving driving device, used to drive the sliding seat to move along the Z direction.

[0008] A further technical solution of the present invention is that the ejector rod includes an insertion part and a connection part, the diameter of the insertion part is slightly smaller than the diameter of the inner hole of the pipe body, so as to support inside the inner hole of the pipe body, and the diameter of the connection part is larger than the diameter of the inner hole of the pipe body.

[0009] A further technical solution of the present invention is that a conical surface is provided at the connection between the insertion part and the connection part. When the tightening device applies an axial tightening force to the rear end of the main shaft, one end position of the pipe body is located on this conical surface.

[0010] A further technical solution of the present invention is that a taper shank is fixedly connected to one end of the ejector rod, and a taper hole with a taper fit with the taper shank is provided at the front end of the main shaft.

[0011] A further technical solution of the present invention is that the rotary driving device includes a first motor installed on the sliding seat, a driving pulley sleeved on the output shaft of the first motor, a driven pulley sleeved on the tool shaft, and a synchronous belt drivingly connected between the driving pulley and the driven pulley.

[0012] A further technical solution of the present invention is that the tightening device includes a tailstock, an axial movement source installed on the tailstock, and a tightening element installed at the front end of the axial movement source.

[0013] A further technical solution of the present invention is that the tightening element forms a surface contact or a point contact with the rear end face of the main shaft.

[0014] A further technical solution of the present invention is that the tightening element is a universal ball.

[0015] A further technical solution of the present invention is that the universal ball includes a ball seat and a ball body, the ball seat is fixed on one of the axial movement source and the main shaft, and the ball body is fixed on the other of the axial movement source and the main shaft.

[0016] A further technical solution of the present invention is that it further includes an elastic member to keep the ball seat and the sphere in contact all the time.

[0017] A further technical solution of the present invention is that the axial movement source adopts a hydraulic cylinder, a first connection member is fixed on the piston rod thereof, a second connection member is fixed at the rear end of the main shaft, and both ends of the elastic member are respectively fixed on the first connection member and the second connection member.

[0018] A further technical solution of the present invention is that a rotation restricting device is provided at the rear end of the main shaft. When the cutter shaft rotates under the control of the rotation driving device, the rotation restricting device can prevent the main shaft from rotating.

[0019] A further technical solution of the present invention is that the rotation restricting device includes a hoop body clamped on the rear end of the main shaft and a fixing member. One end of the fixing member is fixed on the hoop body, and the other end is fixed on the base.

[0020] A further technical solution of the present invention is that the cutting assembly includes a tool holder fixedly installed at the front end of the cutter shaft and a cutting tool installed on the tool holder. The cutting tool includes a first cutting tool, a second cutting tool and a third cutting tool, and the distances between the first cutting tool, the second cutting tool and the third cutting tool and the end of the pipe body gradually increase. The distance that the tip of the second cutting tool extends inward in the direction of the axis of the cutter shaft is greater than the distance that the tip of the first cutting tool extends inward in the direction of the axis of the cutter shaft.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. A tightening device is provided at the rear end of the cutter shaft, so as to apply an axial tightening force at the rear end of the cutter shaft. When the front end of the pipe body is inserted into the insertion part of the ejector rod and is in place, a tightening force is applied at the rear end of the main shaft through the tightening device, so that a part of the length of the conical surface of the ejector rod is pushed into the inner hole of the spiral finned tube, avoiding the problem that the wall thickness of the processed pipe body is uneven due to the spiral finned tube deviating from the axis.

[0023] 2. The tightening element can form a point contact with the rear end face of the main shaft, reducing the stress generated on the main shaft and the cutter shaft.

[0024] 3. An elastic member is provided between the hydraulic cylinder and the main shaft. When there is a gap between the ball seat and the sphere, after the piston rod of the hydraulic cylinder is reset, the elastic force generated by the elastic member can pull the main shaft and the ejector rod to move backward along the Z direction to the initial position, and keep the ball seat and the sphere in contact all the time, effectively avoiding the problem that the end length of the processed spiral finned tube is greater than the dimensional tolerance.

[0025] 4. A rotation restricting device is provided at the rear end of the main shaft. During the process of processing the pipe body, the problem that the ball seat and the sphere rotate and cause a large gap due to long-term friction is effectively avoided. Brief Description of the Drawings

[0026] Figure 1A is a perspective structure schematic diagram of an integral spiral finned tube;

[0027] Figure 1B is a structure schematic diagram of an integral spiral finned tube with one end part of its spiral fins cut off;

[0028] Figure 1C is a structure schematic diagram of the wall thickness of the cut-off part of an integral spiral finned tube;

[0029] Figure 1D is a structure schematic diagram of an integral spiral finned tube after chamfering;

[0030] Figure 2 is a perspective structure schematic diagram of a tube end processing device;

[0031] Figure 3 is the front view of a tube end processing device;

[0032] Figure 4 is a sectional structure schematic diagram of the main shaft and the cutter shaft in a tube end processing device;

[0033] Figure 5 is a structure schematic diagram of the ejector rod separated from the main shaft in a tube end processing device;

[0034] Figure 6 is a perspective view of the sliding seat in a tube end processing device;

[0035] Figure 7 is a combined view of the main shaft, the cutter shaft and the cutting assembly in a tube end processing device;

[0036] Figure 8 is a top view structure schematic diagram of the cutting assembly;

[0037] Figure 9 is the second embodiment of the clamping device in a tube end processing device;

[0038] Figure 10 is the third embodiment of the clamping device of the present invention;

[0039] Figure 11 is Figure 10 a partial part drawing of;

[0040] Figure 12 is Figure 11 a perspective exploded structure schematic diagram of;

[0041] Figure 13 is a structure schematic diagram of the rotation limiting device in a tube end processing device.

[0042] In the figure: 10, pipe body; 11, spiral fin; 12, inner hole; 13, rounded corner; 20, base; 30, clamping device; 40, sliding seat; 40a, slider; 40b, slide rail; 41, main shaft; 411, tapered hole; 42, tool shaft; 421, bearing; 422, bearing seat; 43, ejector rod; 431, insertion part; 432, connection part; 433, tapered surface; 434, tapered shank; 60, cutting assembly; 61, tool holder; 62, cutting tool; 621, first cutting tool; 622, second cutting tool; 623, third cutting tool; 70, rotary drive device; 71, first motor; 72, driving pulley; 73, driven pulley; 74, synchronous belt; 75, adjusting assembly; 751, support rod; 752, nut; 76, motor seat; 80, Z-direction moving drive device; 81, second motor; 82, lead screw; 83, nut; 51, clamping device; 511, tailstock; 512, clamping element; 513, hydraulic cylinder; 52, clamping device; 521, tailstock; 522, clamping element; 523, hydraulic cylinder; 53, clamping device; 531, tailstock; 532, clamping element; 5321, ball seat; 5322, ball; 5323, first connecting rod; 5324, second connecting rod; 533, hydraulic cylinder; 534, elastic member; 535, first connecting member; 536, second connecting member; 90, anti-rotation device; 91, hoop body; 92, fixing member. Detailed implementation mode

[0043] The following further describes the detailed implementation mode of the present invention in conjunction with the accompanying drawings.

[0044] As Figure 2 and Figure 3 shown, the pipe end processing equipment includes a base 20. A clamping device 30 is fixedly arranged on the top of the base 20 and is suitable for clamping the pipe body 10. Exemplarily, the clamping device 30 can adopt a hydraulic chuck, a pneumatic chuck or an existing manual fixture to fix the spiral finned tube; A sliding seat 40 is slidably installed on the top of the base 20 along the Z direction. For example, the sliding seat 40 is slidably connected to the base 20 through a slide rail slider assembly. Exemplarily, a slider 40a is fixed at the bottom of the sliding seat 40, and a slide rail 40b slidably matched with the slider 41 is arranged on the base 20 along the Z direction. Of course, the sliding seat 40 can also be slidably connected to the base 20 through a guide post guide sleeve assembly (not shown in the figure);

[0045] Refer to Figure 3 and Figure 4, a main shaft 41 is arranged on the sliding seat 40 along the Z-axis direction. A tool shaft 42 is sleeved outside the main shaft 41. The tool shaft 42 is in sliding fit with the main shaft 41, and the tool shaft 42 is rotatably installed on the sliding seat 40; preferably, the main shaft 41 is in sliding fit with the tool shaft 42 through a ball bearing (not shown in the figure) to reduce the frictional force generated when the main shaft 41 and the tool shaft 42 move relative to each other. For example, a ball bearing is fixedly installed in the shaft hole of the tool shaft 42, and the main shaft 41 contacts the rollers on the ball bearing, thereby reducing the contact area between the tool shaft 42 and the main shaft 41 and reducing the frictional resistance; bearings 421 are fixed at positions near both ends of the outer surface of the tool shaft 42. The bearings 421 are preferably fixed on the sliding seat 40 through bearing seats 422, so that the tool shaft 42 can rotate relative to the sliding seat 40;

[0046] Reference Figure 5 , a ejector rod 43 can be installed at the front end of the main shaft 41 in a fixed or detachable manner. The axis of the ejector rod 43 coincides with the axis of the main shaft 41. The ejector rod 43 includes an insertion part 431 and a connection part 432. The diameter of the insertion part 431 is slightly smaller than the diameter of the inner hole 12 of the spiral finned tube, so that it can be inserted into the inner hole 12 of the spiral finned tube. The diameter of the connection part 432 is larger than the diameter of the inner hole 12 of the spiral finned tube. When the insertion part 431 is completely inserted into the inner hole 12 of the spiral finned tube, the connection part 432 can limit the spiral finned tube from moving further in the direction towards the tool shaft 42. When a radial force is applied to one end of the tube body 10, the ejector rod 43 plays a role in supporting the spiral finned tube, effectively avoiding the problem that the spiral finned tube deviates from the axis; it should be explained that: the end of the main shaft 41 close to the spiral finned tube is the front end, and the other end is the rear end;

[0047] Preferably, a conical surface 433 is provided at the connection between the insertion part 431 and the connection part 432. The diameter of one end of the conical platform is the same as the diameter of the insertion part 431, and the other end is the same as the diameter of the connection part 432. After the spiral finned tube is clamped, by applying a force to the rear end of the main shaft 41, a part of the length of the conical surface 433 is pushed into the inner hole 12 of the spiral finned tube, further avoiding the problem that the spiral finned tube deviates from the axis, and at the same time playing a role in centering the inner hole 12 of the spiral finned tube, so that the axis of the inner hole 12 of the spiral finned tube coincides with the axis of the main shaft 41; in a preferred embodiment, one end of the ejector rod is detachably connected to the front end of the main shaft 41. For example, a taper shank 434 is fixedly connected to one end of the ejector rod 43, and a taper hole 411 with a taper fit with the taper shank 434 is provided at the front end of the main shaft 41. The taper shank 434 can be a Morse No. 5 taper shank. Thus, one end of the ejector rod 43 can be connected to the front end of the main shaft 41 by plugging and unplugging, and because the taper shank 434 and the taper hole 411 are in taper fit, it is convenient to keep the axes of the tool shaft 42 and the ejector rod 43 consistent.

[0048] A tightening device is provided at the rear end of the tool shaft 42 to apply an axial tightening force at the rear end of the tool shaft 42. When the front end of the spiral finned tube is inserted into the insertion portion 431 of the ejector rod 43 and is in place, a tightening force is applied at the rear end of the main shaft 41 through the tightening device 50, so that a part of the length of the conical surface of the ejector rod 43 is pushed into the inner hole 12 of the spiral finned tube;

[0049] Reference Figure 6 、 Figure 7 and Figure 8 As shown in, a cutting assembly 60 is installed at the front end of the tool shaft 42, and a rotary driving device 70 is installed at the rear end of the tool shaft 42 to drive the tool shaft 42 and the cutting assembly 60 to rotate synchronously. Exemplarily, the rotary driving device 70 includes a first motor 71 installed on the sliding seat 40, a driving pulley 72 sleeved on the output shaft of the first motor 71, a driven pulley 73 sleeved on the tool shaft 42, and a synchronous belt 74 drivingly connected between the driving pulley 72 and the driven pulley 73; Preferably, the tension of the synchronous belt is adjustable. For example, the top of the sliding seat 40 is connected with a motor base 76 through an adjusting assembly 75. The motor base 76 is located directly above the sliding seat 40. The adjusting assembly 75 includes a plurality of vertically arranged support rods 751 and nuts 752 screwed on the external threads of each support rod 751. The motor base 76 is fixed on the support rods 751, and the nuts 752 are respectively located on the upper and lower sides of the motor base 76. By adjusting the heights of the motor base 76 and the first motor 71, the tension of the synchronous belt 74 is adjusted.

[0050] Reference Figure 3 and Figure 6 As shown in, a Z-direction moving driving device 80 is further provided on the base 20 to drive the sliding seat 40, the tool shaft 42, the cutting assembly 60 and the rotary driving device 70 to move forward or backward along the Z direction. When the tool moves forward under the control of the Z-direction moving driving device 80, the tool acts on the end of the spiral finned tube. Exemplarily, the Z-direction moving driving device 80 includes a second motor 81 fixed on the base 20, a lead screw 82 installed on the second motor 81, and a nut 83 fixed on the sliding seat 40. The second motor 81 preferably adopts a servo motor, and the servo motor is connected to a controller (not shown in the figure). Cooperating with the lead screw and nut assembly, the advancing distance of the cutting assembly 60 is accurately controlled;

[0051] Reference Figure 7 and Figure 8, the cutting assembly 60 includes a tool holder 61 fixedly installed at the front end of the tool shaft 42 and a cutting tool 62 installed on the tool holder 61. When the tool shaft 42 is driven to rotate, the cutting assembly 60 rotates together with the tool shaft 42. The cutting assembly 60 is driven by the Z-direction movement driving device 80 to move towards the spiral fin tube. The cutting assembly 60 makes a circular motion around the axis of the spiral fin tube, so as to process the end of the spiral fin tube; the cutting tool 62 includes a first cutting tool 621, a second cutting tool 622 and a third cutting tool 623. The first cutting tool 621 is a roughing tool, which cuts off the spiral fins at one end of the spiral fin tube to form Figure 1B the spiral fin tube shown in the figure. The second cutting tool 622 is a finishing tool. According to the designed wall thickness of the pipe, a part of the wall thickness of the smooth pipe at one end of the spiral fin tube is cut off (forming Figure 1C the spiral fin tube shown in the figure. At this time, the wall thickness of the spiral fin tube decreases), that is, the distance that the tip of the second cutting tool 622 extends inwards towards the axis of the tool shaft 42 is greater than the distance that the tip of the first cutting tool 621 extends inwards towards the axis of the tool shaft 42. The third cutting tool 623 is used for processing the outer end face of the spiral fin tube to form a fillet 13 (refer to Figure 1D ); Therefore, the end of the spiral fin tube can be processed in one step, improving the processing efficiency. It should be noted that: the distance between the first cutting tool 621 and the spiral fin tube must be less than the distance between the second cutting tool 622 and the spiral fin tube, and the distance between the second cutting tool 622 and the spiral fin tube is less than the distance between the third cutting tool 623 and the spiral fin tube. When the cutting tool 62 moves towards the spiral fin tube, the first cutting tool 621 first cuts off the spiral fins 11 at one end of the spiral fin tube, and then the second cutting tool 622 cuts off a part of the wall thickness of the pipe body 10, so that the wall thickness of the spiral fin tube is within the designed wall thickness tolerance range.

[0052] Refer to Figure 3, as the first embodiment of the clamping device 51, the clamping device 51 includes a tailstock 511 fixed on the base 20, an axial movement source installed on the tailstock 511, and a clamping element 512 installed at the front end of the axial movement source. The clamping element 512 can be in various shapes such as plate-shaped, cylindrical, etc., with a flat surface at one end close to the main shaft 41. By driving the plate-shaped clamping element 512 to move towards the main shaft 41 through the axial movement source, a surface contact is formed between the clamping element 512 and the rear end surface of the main shaft 41. The axial movement source can adopt a hydraulic cylinder 513. The hydraulic cylinder 513 is fixed on the base 20. By driving the hydraulic cylinder, the clamping element 512 contacts the rear end surface of the main shaft 41. Thus, both ends of the main shaft 41 are clamped and fixed through the cooperation of the clamping device 51 and the clamping device 30. The defect of this fixing method is that a surface contact is formed between the clamping element 512 and the rear end surface of the main shaft 41, which will generate a large stress on the main shaft 41. Since the main shaft 41 and the tool shaft 42 adopt a sliding fit, the shaft hole of the tool shaft 42 is slightly larger than the diameter of the main shaft 41. That is to say, there is still a certain gap between the main shaft 41 and the tool shaft 42. When the main shaft 41 is under the action of the clamping device 51 and its axis deflects up and down or left and right, it will generate a large resistance to the rotation of the tool shaft 42, affecting the service life of the first motor 71 and the synchronous belt 74;

[0053] Reference Figure 9 , as the second embodiment of the clamping device 52, the clamping device 52 includes a tailstock 521 fixed on the base 20, an axial movement source installed on the tailstock 521, and a clamping element 522 installed at the front end of the axial movement source. The shape of the clamping element 522 is spherical, hemispherical, conical, elliptical, etc., so that a point contact can be formed between the clamping element 522 and the rear end surface of the main shaft 41, reducing the stress generated on the main shaft 41 and the tool shaft 42. In this embodiment, the axial movement source can adopt a hydraulic cylinder 523;

[0054] Reference Figure 10 、 Figure 11 and Figure 12 , as the third embodiment of the clamping device 53, the clamping device 53 includes a tailstock 531 fixed on the base 20, an axial movement source installed on the tailstock 531, and a clamping element 532 installed at the front end of the axial movement source. The clamping element 532 adopts a universal ball. The universal ball includes a ball seat 5321 and a ball body 5322. The ball seat 5321 is fixed on one of the axial movement source and the main shaft 41, and the ball body 5322 is fixed on the other of the axial movement source and the main shaft 41, which can also reduce the stress generated on the main shaft 41 and the tool shaft 42 and improve the service life of the synchronous belt 74 and the first motor 71. Specifically, the ball seat 5321 is connected to the piston rod of the hydraulic cylinder through a first connecting rod 5323, and the ball body 5322 is connected to the main shaft 41 through a second connecting rod 5324. In this embodiment, the axial movement source can adopt a hydraulic cylinder 533;

[0055] When the ball seat 5321 and the sphere 5322 rotate relative to each other for a long time, a certain gap is generated between them due to contact friction; when the staff manually installs the spiral finned tube onto the ejector rod 43, there is also a slight gap between the inner hole of the spiral finned tube and the conical surface of the ejector rod 43. The clamping device 30 first clamps the spiral finned tube, and then the jacking device 53 is started to apply an axial force to the rear end of the main shaft 41. At this time, the main shaft 41 and the ejector rod 43 will move forward a small distance along the Z direction. After the end of the spiral finned tube is processed, the hydraulic cylinder 513 and the jacking element 532 are controlled to reset, but the positions of the main shaft 41 and the ejector rod 43 will not move axially backward to the initial position. That is to say, the axial position of the conical surface 433 of the ejector rod 43 will change relative to the originally set position. When processing multiple spiral finned tubes, the distance between the end of each spiral finned tube clamped by the clamping device 30 and the cutting assembly 60 will increase, resulting in a gradual decrease in the end length D of the processed spiral finned tube, and even the end length D of the spiral finned tube is greater than the originally set tolerance. To solve this technical problem, an elastic member 534 is provided between the hydraulic cylinder 533 and the main shaft 41. When there is a gap between the ball seat 5321 and the sphere 5322, after the piston rod of the hydraulic cylinder 533 resets, the elastic force generated by the elastic member 534 can pull the main shaft 41 and the ejector rod 43 to move backward along the Z direction to the initial position and keep the ball seat 5321 and the sphere 5322 always in contact. Specifically, a first connecting member 535 is fixed on the piston rod of the hydraulic cylinder 533, a second connecting member 536 is fixed at the rear end of the main shaft 41, and the elastic member 534 is a tension spring. The two ends of the tension spring are respectively fixed on the first connecting member 535 and the second connecting member 536. In order to provide a large elastic tension to axially move the main shaft 41 backward for reset, multiple tension springs can be provided.

[0056] Reference Figure 13 , in this embodiment, when the tool shaft 42 rotates at a high speed under the control of the rotation driving device 70, due to the frictional force between the tool shaft 42 and the main shaft 41, the main shaft 41 will be driven to rotate, causing the ball seat 5321 and the sphere 5322 to also rotate relative to each other. To avoid the problem that the rotation of the ball seat 5321 and the sphere 5322 during the processing process leads to a large gap generated by long-term friction between the two, a rotation limiting device 90 can be provided at the rear end of the main shaft 41. Exemplarily, the rotation limiting device 90 includes a hoop body 91 that is hoop-tightened at the rear end of the main shaft 41 and a fixing member 92. One end of the fixing member 92 is fixed on the hoop body 91, and the other end is fixed on the base 20.

[0057] It should be emphasized that: the above integral spiral finned tube is only one of the application scenarios of the tube end processing equipment, and other tube bodies without spiral fins are also applicable to the present invention. Whether processing long tube bodies or short tube bodies, they are all within the protection scope of the present invention.

[0058] In the description of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0060] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pipe end processing device, characterized in that, Comprising: A base on which a chuck adapted to clamp a pipe body is mounted; A sliding seat slidably mounted on the base along the Z direction; A tool shaft rotatably mounted on the sliding seat. The tool shaft has a shaft hole, and when the pipe body is clamped, the axis of the shaft hole can coincide with the axis of the pipe body; A main shaft slidably engaged with the tool shaft. A ejector rod is connected to the front end of the main shaft, and at least a part of the ejector rod has a size slightly smaller than the size of the inner hole of the pipe body to support in the inner hole of the pipe body; A tightening device provided at the rear end of the main shaft to apply an axial tightening force to the rear end of the main shaft so that the main shaft is clamped between the tightening device and the pipe body; A cutting assembly fixedly mounted at the front end of the tool shaft; A rotary driving device mounted on the sliding seat. The rotary driving device rotates the tool shaft to make the cutting assembly rotate around the axis of the pipe body; A Z-direction moving driving device for driving the sliding seat to move along the Z direction.

2. The pipe end processing equipment according to claim 1, characterized in that, The ejector rod includes an insertion part and a connecting part. The diameter of the insertion part is slightly smaller than the diameter of the inner hole of the pipe body to support inside the inner hole of the pipe body, and the diameter of the connecting part is larger than the diameter of the inner hole of the pipe body.

3. The tube end processing equipment according to claim 2, characterized in that, A conical surface is provided at the connection between the insertion part and the connecting part. When the tightening device applies an axial tightening force to the rear end of the main shaft, one end position of the pipe body is located on this conical surface.

4. The tube end processing equipment according to claim 3, characterized in that, One end of the ejector rod is fixedly connected with a taper shank, and a taper hole which is taper-fitted with the taper shank is provided at the front end of the main shaft.

5. The tube end processing equipment according to claim 1, characterized in that The rotary driving device includes a first motor mounted on the sliding seat, a driving pulley sleeved on the output shaft of the first motor, a driven pulley sleeved on the tool shaft, and a synchronous belt drivingly connected between the driving pulley and the driven pulley.

6. The tube end processing equipment according to claim 5, characterized in that, The tightening device includes a tailstock, an axial moving source mounted on the tailstock, and a tightening element mounted at the front end of the axial moving source.

7. The tube end processing equipment according to claim 6, characterized in that, The tightening element forms a surface contact or a point contact with the rear end face of the main shaft.

8. The tube end processing equipment according to claim 6, characterized in that, The tightening element is a universal ball.

9. The tube end processing equipment according to claim 8, wherein The universal ball includes a ball seat and a ball body. The ball seat is fixed on one of the axial moving source and the main shaft, and the ball body is fixed on the other of the axial moving source and the main shaft.

10. The tube end processing equipment according to claim 9, characterized in that, An elastic member is further included to keep the ball seat and the ball body in contact all the time.

11. The tube end processing equipment according to claim 10, characterized in that, The axial moving source adopts a hydraulic cylinder. A first connecting member is fixed on the piston rod of the hydraulic cylinder, a second connecting member is fixed at the rear end of the main shaft, and both ends of the elastic member are respectively fixed on the first connecting member and the second connecting member.

12. The pipe end processing equipment according to any one of claims 9 to 11, characterized in that, A rotation restricting device is provided at the rear end of the main shaft. When the tool shaft rotates under the control of the rotary driving device, the rotation restricting device can prevent the main shaft from rotating.

13. The pipe end processing equipment according to claim 12, characterized in that, The rotation restricting device includes a hoop body clamped on the rear end of the main shaft and a fixing member. One end of the fixing member is fixed on the hoop body, and the other end is fixed on the base.

14. The pipe end processing equipment according to any one of claims 1 to 11, characterized in that, The cutting assembly includes a tool holder fixedly mounted at the front end of the tool shaft and a tool mounted on the tool holder. The tool includes a first tool, a second tool and a third tool, and the distances between the first tool, the second tool and the third tool and the end of the pipe body gradually increase. The distance that the tip of the second tool extends inward in the direction of the axis of the tool shaft is greater than the distance that the tip of the first tool extends inward in the direction of the axis of the tool shaft.

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