Tailstock connecting device

Abstract

The utility model relates to a tailstock connecting device which solves the technical problems that under the condition that a chuck and a mandrel on an existing numerical control machine tool conduct long-time batch machining on pipe fittings, the mandrel is abraded, so that the axes of the pipe fittings cannot coincide with the axis of the mandrel, and the cost for replacing the mandrel is too high. The device comprises a supporting seat, a connecting shaft, a needle bearing, a tail positioning sleeve, a self-aligning ball bearing, an elastic check ring, a bearing spacer sleeve, a right air cavity base, a right gland, a right sliding disc, a second nut seat, a right tensioning sleeve connecting shaft, a second pull rod and a right tensioning sleeve, the supporting seat is provided with an axial center through hole, and the connecting shaft is located in the axial center through hole; the rear end of the connecting shaft is rotationally connected with the rear end of the supporting seat through a needle bearing, and the tail positioning sleeve is connected with the rear end of the supporting seat. The device is widely used for machining pipe fittings on a machine tool.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe fitting processing, in particular to a tailstock connecting device. Background Art

[0002] During the processing of pipe fittings, the chuck of the CNC machine tool fixes one end of the pipe fitting by clamping or supporting it, and the mandrel is installed on the rear tailstock of the machine tool. The front end of the mandrel supports the other end of the pipe fitting, and then the processing is carried out. However, under long-term batch processing, the mandrel will wear, resulting in the mandrel's accuracy not meeting the requirements, which in turn leads to low coaxiality between the pipe fitting and the mandrel, and it cannot be guaranteed that the axis of the pipe fitting coincides with the axis of the mandrel, which ultimately causes the size of the pipe fitting to fail to meet the design requirements. If a new mandrel is replaced, the processing cost will increase. Summary of the invention

[0003] The utility model provides a tailstock connection device with reduced cost to solve the technical problems that the axis of the pipe fitting and the axis of the mandrel cannot be coincident due to the wear of the mandrel after long-term use in existing CNC machine tools for processing pipe fittings, and the cost of replacing the mandrel is too high.

[0004] The utility model provides a tailstock connection device, comprising a support seat, a connecting shaft, a needle bearing, a tail positioning sleeve, a self-aligning ball bearing, an elastic retaining ring, a bearing retaining sleeve, a right air chamber base, a right pressure cover, a right sliding disk, a second nut seat, a right tension sleeve connecting shaft, a second pull rod and a right tension sleeve, the support seat is provided with an axial center through hole, the connecting shaft is located in the axial center through hole, the rear end of the connecting shaft is rotatably connected to the rear end of the support seat through the needle bearing, and the tail positioning sleeve is connected to the rear end of the support seat; the front end of the support seat is provided with a bearing chamber, the self-aligning ball bearing is located in the bearing chamber, the front part of the connecting shaft is connected to the self-aligning ball shaft The inner ring of the bearing is connected, the elastic retaining ring is located at the bottom of the bearing chamber at the front end of the support seat, the self-aligning ball bearing presses the elastic retaining ring, the bearing retaining sleeve is sleeved on the front part of the connecting shaft, and the bearing retaining sleeve is connected to the opening of the bearing chamber at the front end of the support seat; two sealing rings are connected between the connecting shaft and the support seat, the front end of the connecting shaft is a disc part, and the disc part is fixedly connected to the right air cavity base by multiple screws; the support seat is provided with a compressed air inlet and outlet channel, the connecting shaft is provided with a circumferential arc groove, a side air hole and an axial air hole, the side air hole is connected to the circumferential arc groove, the axial air hole is connected to the side air hole, and the compressed air inlet and outlet channel It is connected to the side air hole; two sealing rings between the connecting shaft and the support seat are located on both sides of the side air hole; the right air cavity base is provided with a chamber, and the central part of the right air cavity base is provided with a guide hole, which is connected to the axial air hole of the connecting shaft; the right pressure cover is fixedly connected to the right air cavity base by multiple screws, the right sliding disk is located in the chamber of the right air cavity base, and a sealing ring is connected between the periphery of the right sliding disk and the side wall of the chamber of the right air cavity base, the inner side of the right pressure cover is provided with a spring positioning groove, and a spring is provided in the spring positioning groove of the right pressure cover, the left end face of the right sliding disk is in contact with the spring on the right pressure cover, and multiple springs are provided. Spring; the right end of the right sliding disk is provided with an axial air inlet hole and a side air inlet hole which are connected together, and there are multiple side air inlet holes, which are connected to the chamber of the right air cavity base; the right end of the right sliding disk is located in the guide hole of the right air cavity base and can slide; the second nut seat is fixedly connected to the middle part of the left end face of the right sliding disk by screws; the right tensioning sleeve connecting shaft is fixedly connected to the right pressure cover by multiple screws; the right tensioning sleeve connecting shaft is provided with a guide through hole, the second pull rod passes through the guide through hole of the right tensioning sleeve connecting shaft and can slide, and the right tensioning sleeve is sleeved on the left end portion of the second pull rod and the left end of the right tensioning sleeve connecting shaft.

[0005] Preferably, the number of springs is three, four or six.

[0006] Preferably, the right gland is connected with a fine-tuning screw, and the end of the fine-tuning screw abuts against the outer side of the right tension sleeve connecting shaft.

[0007] Preferably, the number of the fine-tuning screws is three or four.

[0008] The utility model has the beneficial effects of replacing the mandrel in the prior art, reducing costs; ensuring coaxiality after long-term use, and the coaxiality of the pipe fitting and the tailstock connection device is high. There is no need to replace the mandrel as in the prior art. The processing quality of the pipe fitting product is guaranteed. The disassembly and assembly operation is simple and fast, saving man-hours, which is conducive to improving processing efficiency. It has good stability and high reliability. It is not easy to be damaged after long-term use. When processing the pipe fitting, the chuck of the machine tool fixes one end of the pipe fitting by clamping or internal support, and the other end of the pipe fitting is fixed by the tailstock connection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the front view of the pneumatic internal expansion tooling for machine tools;

[0010] Figure 2 yes Figure 1 Sectional view in the AA direction;

[0011] Figure 3 yes Figure 2 In the structure shown, a partial structural diagram of the left chuck;

[0012] Figure 4 yes Figure 2 A partial structural diagram of the air pipe connected to the left sliding plate of the left chuck in the structure shown;

[0013] Figure 5 yes Figure 2 A partial structural diagram of the tailstock connection device in the structure shown;

[0014] Figure 6 yes Figure 2 In the structure shown, a partial structural diagram of the connection between the connecting shaft and the supporting seat;

[0015] Figure 7 It is a structural schematic diagram of a fine-tuning screw connected to the right pressure cover of the tailstock connecting device.

[0016] Explanation of symbols in the figure:

[0017] 100. Left chuck, 101. Left disc, 101-1. Annular clamping boss, 102. Left air chamber base, 102-1. Chamber, 103. Screw, 104. Left gland, 105. Left sliding disc, 105-1. Air hole, 106. Sealing ring, 107. Sealing ring, 108. Spring, 109. Left tension sleeve connecting shaft, 110. First pull rod, 111. First nut seat, 112. Screw, 113. Screw, 114. Bolt, 115. Guide pin shaft, 116. Fine adjustment screw, 117. Left tension sleeve; 500. Rotary joint, 600. Air pipe, 601. Channel, 602. Side vent, 603. Circumferential arc groove, 700. Tailstock connecting device, 701. Support seat, 701-1. Compressed air inlet and outlet channel, 702 .Connecting shaft, 702-1. Side air hole, 702-2. Axial air hole, 702-3. Circumferential arc groove, 703. Needle roller bearing, 704. Tail positioning sleeve, 705. Self-aligning ball bearing, 706. Elastic retaining ring, 707. Bearing retaining sleeve, 708. Sealing ring, 709. Screw, 710. Right air chamber base, 710-1. Chamber, 710-2. Guide hole, 711. Right pressure cover, 712. Screw, 713. Right sliding plate, 713-1. Axial air inlet hole, 713-2. Side air inlet hole, 714. Spring, 715. Sealing ring, 716. Second nut seat, 717. Screw, 718. Right tension sleeve connecting shaft, 719. Second pull rod, 720. Screw, 721. Right tension sleeve, 722. Fine-tuning screw; 300. Pipe fittings. DETAILED DESCRIPTION

[0018] like Figure 1-6 As shown, the pneumatic internal expansion tooling for a machine tool comprises a left chuck 100 , a tailstock connecting device 700 and an air pipe 600 .

[0019] The left chuck 100 includes a left disc 101, a left air cavity base 102, a screw 103, a left pressure cover 104, a left sliding disc 105, a sealing ring 106, a sealing ring 107, a spring 108, a left tension sleeve connecting shaft 109, a first pull rod 110, a first nut seat 111, a screw 112, a screw 113, a bolt 114, and a left tension sleeve 117. The left air cavity base 102 is located between the left disc 101 and the left pressure cover 104. A plurality of screws 103 first pass through the left pressure cover 104 and then through the left air cavity base 102, and then are connected with the threaded holes on the left disc 101, so as to realize the fixed assembly of the left disc 101, the left air cavity base 102, and the left pressure cover 104 together. The air pipe 600 passes through the left disc 101, and the end of the air pipe 600 is inserted into the left end of the left sliding disc 105 to be interference fit. The left air cavity base 102 is fixed in the same manner as the left air cavity base 102, the left sliding disk 105 is located in the chamber 102-1, the left air cavity base 102 is provided with a central through hole, the left end of the left sliding disk 105 is located in the central through hole of the air cavity base 102, the left end of the left sliding disk 105 is slidably connected to the central through hole of the air cavity base 102, and a sealing ring 106 is provided between the left end of the left sliding disk 105 and the inner wall of the central through hole of the air cavity base 102; when the air cavity base 102 is stationary, the left end of the left sliding disk 105 can slide in the central through hole of the air cavity base 102, and since the end of the air pipe 600 is fixedly connected to the left end of the left sliding disk 105, the left sliding disk 105 drives the air pipe 600 to move, and the other end of the air pipe 600 arranged in the rotary joint 500 slides with the rotary joint 500 as a reference. The sealing ring 107 is connected between the periphery of the left sliding disk 105 and the side wall of the chamber 102-1, and the left sliding disk 105 can slide in the chamber 102-1. The end of the air pipe 600 is provided with a side vent hole 602 and a circumferential arc groove 603, the circumferential arc groove 603 is connected to the side vent hole 602, the side vent hole 602 is connected to the channel 601, and the left end of the left sliding disk 105 is provided with four air holes 105-1, each of which is connected to the side vent hole 602, and the air hole 105-1 is connected to the chamber 102-1. The inner side surface of the left pressure cover 104 is provided with a spring positioning groove, and the spring 108 is located in the spring positioning groove. The right end surface of the left sliding disk 105 contacts the spring 108, that is, the spring 108 is provided between the right end surface of the left sliding disk 105 and the left pressure cover 104, and the number of the springs 108 is multiple.The left tensioning sleeve connecting shaft 109 is fixedly connected to the outer side surface of the left pressure cover 104 by means of screws 113. The left tensioning sleeve connecting shaft 109 is provided with a center through hole. The first pull rod 110 passes through the guide center through hole of the left tensioning sleeve connecting shaft 109. The first pull rod 110 can slide in the guide center through hole. The left tensioning sleeve 117 is sleeved on the right end of the first pull rod 110. The left tensioning sleeve 117 is also sleeved on the right end of the left tensioning sleeve connecting shaft 109. The matching structure of the left tensioning sleeve 117 and the right end of the first pull rod 110 and the right end of the left tensioning sleeve connecting shaft 109 is a conventional structure in the prior art. The first nut seat 111 is fixedly installed on the central part of the right end surface of the left sliding disk 105 by means of a screw 112. The left end of the first pull rod 110 is provided with an external thread, and the external thread on the left end of the first pull rod 110 is connected to the internal thread on the first nut seat 111, thereby fixing the left end of the first pull rod 110 to the central part of the right end surface of the left sliding disk 105. When the left chuck 100 is working, the rotary joint 500 is connected to the air pipe 600 (the air pipe 600 can rotate radially with the rotary joint 500 as a reference, and can also slide axially with the rotary joint 500 as a reference), and compressed air is input. The compressed air enters the channel 601 of the air pipe 600 from the rotary joint 500, and then enters the chamber 102-1 through the air hole 105-1. Then, the compressed air in the chamber 102-1 pushes the left sliding disk 105 to move right, and the left sliding disk 105 moves right with the first pull rod 110, the spring 108 is compressed, and the first pull rod 110 moves to the right to make the left tensioning sleeve 117 in a relaxed state (such as. Figure 2 The pressure is released, the force of the compressed air disappears, and the left sliding plate 105 moves to the left to return to its original position under the elastic force of the spring 108, and the first pull rod 110 moves to the left accordingly. At this time, the left tensioning sleeve is in a tensioned state.

[0020] The outer edge of the end surface of the left disk 101 is provided with an annular clamping boss 101-1, which is used to cooperate with the flange on the main shaft of the machine tool. Six bolts 114 pass through the left disk 101 from the inside to the outside, and the six bolts 114 are evenly distributed along the circumference of the left disk 101. The threaded heads of the bolts 114 are exposed outside.

[0021] The tailstock connecting device 700 includes a support seat 701, a connecting shaft 702, a needle bearing 703, a tail positioning sleeve 704, a self-aligning ball bearing 705, an elastic retaining ring 706, a bearing retaining sleeve 707, a sealing ring 708, a screw 709, a right air chamber base 710, a right pressure cover 711, a screw 712, a right sliding disk 713, a spring 714, a sealing ring 715, a second nut seat 716, a screw 717, a right tensioning sleeve connecting shaft 718, a second pull rod 719, a screw 720, and a right tensioning sleeve 721. The support seat 701 is provided with an axial center through hole, and the connecting shaft 702 is located in the axial center through hole. The rear end of the connecting shaft 702 is rotatably connected to the rear end of the support seat 701 through the needle bearing 703, and the tail positioning sleeve 704 is connected to the rear end of the support seat 701. The tail positioning sleeve 704 is used to position the needle bearing 703 and the rear end of the connecting shaft 702. The front end of the support seat 701 is provided with a bearing chamber, in which the self-aligning ball bearing 705 is located, the front part of the connecting shaft 702 is connected to the inner ring of the self-aligning ball bearing 705, the elastic retaining ring 706 is located at the bottom of the bearing chamber at the front end of the support seat 701, the self-aligning ball bearing 705 presses down the elastic retaining ring 706, the bearing stopper sleeve 707 is sleeved on the front part of the connecting shaft 702, the bearing stopper sleeve 707 is connected to the opening of the bearing chamber at the front end of the support seat 701, and the bearing stopper sleeve 707 presses down the outer ring of the self-aligning ball bearing 705, that is, the front part of the connecting shaft 702 is rotatably connected to the front part of the support seat 701 through the self-aligning ball bearing 705, and the entire connecting shaft 702 can rotate. Two sealing rings 708 are connected between the connecting shaft 702 and the support seat 701. The front end of the connecting shaft 702 is a disc portion, and a plurality of screws 709 pass through the disc portion. The support seat 701 is provided with a compressed air inlet and outlet channel 701-1, and the connecting shaft 702 is provided with a circumferential arc groove 702-3, a side air hole 702-1, and an axial air hole 702-2. The side air hole 702-1 is connected to the circumferential arc groove 702-3, the axial air hole 702-2 is connected to the side air hole 702-1, and the compressed air inlet and outlet channel 701-1 is connected to the side air hole 702-1. Two sealing rings 708 are located on both sides of the side air hole 702-1. Regardless of how the connecting shaft 702 and the support seat 701 rotate relative to each other, external compressed air can enter the axial air hole 702-2 through the compressed air inlet and outlet channel 701-1.The screw 709 is connected with the threaded hole on the rear end face of the right air cavity base 710, so as to fix the right air cavity base 710 with the front end disc part of the connecting shaft 702; the right air cavity base 710 is provided with a chamber 710-1, and the central part of the right air cavity base 710 is provided with a guide hole 710-2, and the guide hole 710-2 is connected with the axial air hole 702-2; a plurality of screws 712 are passed through the right pressure cover 711 and connected with the threaded hole on the front ... The right gland 711 is fixedly connected to the right air cavity base 710, the right sliding plate 713 is located in the chamber 710-1 of the right air cavity base 710, a sealing ring 715 is connected between the periphery of the right sliding plate 713 and the side wall of the chamber 710-1, a spring positioning groove is provided on the inner side of the right gland 711, a spring 714 is placed in the spring positioning groove, the left end face of the right sliding plate 713 is in contact with the spring 714, and a plurality of springs 714 are provided (for example, three, four or more springs 714 may be provided). The right end of the right sliding plate 713 is provided with an axial air inlet hole 713-1 and a side air inlet hole 713-2, the side air inlet hole 713-2 is communicated with the axial air inlet hole 713-1, there are multiple side air inlet holes 713-2 (four are shown in the figure for example only), and the side air inlet hole 713-2 is communicated with the chamber 710-1; the right end of the right sliding plate 713 is located in the guide hole 710-2, and the right end of the right sliding plate 713 can be in the guide hole 710 -2; the second nut seat 716 is fixedly connected to the middle of the left end surface of the right sliding disk 713 by screws 717, the right tension sleeve connecting shaft 718 is fixedly connected to the right gland 711 by multiple screws 720, the second tie rod 719 passes through the guide through hole of the right tension sleeve connecting shaft 718, the second tie rod 719 can slide in the guide through hole, the right tension sleeve 721 is sleeved on the left end of the second tie rod 719, and the right tension sleeve 721 is sleeved on the left end of the right tension sleeve connecting shaft 718. The matching structure of the right tension sleeve 721, the second tie rod 719 and the left end of the right tension sleeve connecting shaft 718 is a conventional structure in the prior art. When the tailstock connection device 700 is working, compressed air is input from the compressed air inlet and outlet channel 701-1 of the support seat 701, and then the compressed air passes through the side air hole 702-1 and then the axial air hole 702-2, and then passes through the axial air inlet hole 713-1 and the side air inlet hole 713-2 in sequence to enter the chamber 710-1. The compressed air in the chamber 710-1 pushes the right sliding plate 713 to move leftward, and the right sliding plate 713 moves leftward with the second pull rod 719, and the spring 714 is compressed. Figure 2 The spring 714 is shown in a compressed state), the second pull rod 719 moves to the left to make the right tensioning sleeve 721 in a relaxed state, at this time the pressure is released, the force of the compressed air disappears, and under the elastic force of the spring 714, the right sliding disk 713 moves to the right to return to its original position, and the second pull rod 719 moves to the right accordingly, and at this time the right tensioning sleeve 721 is in a tensioned state.

[0022] The following describes the use of the above-mentioned pneumatic internal expansion tooling for machine tools:

[0023] First, the left disc 101 of the left chuck 100 is docked with the flange on the machine tool spindle, the annular clamping boss 101-1 is matched with the flange, the threaded heads of the six bolts 114 pass through the connection holes on the flange, and nuts are connected to the threaded heads of the bolts 114 to tighten, so that the left disc 101 is fixedly connected to the flange on the machine tool spindle. The air pipe 600 is located in the central through hole of the machine tool spindle.

[0024] Secondly, the support base 701 of the tailstock connecting device 700 is fixedly installed on the rear tailstock of the machine tool.

[0025] Then, the rotary joint 500 is connected to the air pipe 600, and a compressed air hose is used to connect the rotary joint 500. The air pipe 600 is ventilated through the compressed air hose, and the left sliding plate 105 moves to the right, and the left sliding plate 105 moves to the right with the first pull rod 110, the spring 108 is compressed, and the first pull rod 110 moves to the right to make the left tension sleeve 117 in a relaxed state (such as Figure 2 status shown).

[0026] Then, prepare the pipe 300 to be processed, and put the left end of the pipe 300 on the left tensioning sleeve 117. Next, release the pressure, and the force of the compressed air disappears. Under the elastic force of the spring 108, the left sliding disk 105 moves to the left and returns to its original position, and the first pull rod 110 moves to the left accordingly. At this time, the left tensioning sleeve is in a tensioned state and then supports the left end of the pipe 300, so that the left end of the pipe 300 is fixed.

[0027] Then, compressed air is input to the tailstock connecting device 700 through the compressed air inlet and outlet channel 701-1, the right sliding plate 713 moves to the left, and the right sliding plate 713 moves to the left with the second pull rod 719, the spring 714 is compressed, and the second pull rod 719 moves to the left to relax the right tension sleeve 721.

[0028] Then, the rear tailstock of the machine tool is moved to insert the right tension sleeve 721 into the right end of the pipe fitting 300, and then the tailstock connection device 700 is depressurized, the force of the compressed air disappears, and the right tension sleeve 721 is in a tensioned state, thereby supporting the right end of the pipe fitting 300 and fixing the right end of the pipe fitting 300. At this point, the pipe fitting 300 is positioned.

[0029] Finally, the machine tool is started, the left chuck 100 rotates, the right air chamber base 710 and the connecting shaft 702 of the tailstock connecting device 700 rotate, the pipe 300 rotates, and the pipe 300 is processed by a tool.

[0030] It should be noted that after compressed air is passed through the left chuck 100 and the tailstock connecting device 700, the left end of the pipe fitting 300 is sleeved on the left tensioning sleeve 117, and the right end of the pipe fitting 300 is sleeved on the right tensioning sleeve 721, and then the left chuck 100 and the tailstock connecting device 700 are depressurized at the same time, and the left tensioning sleeve 117 and the right tensioning sleeve 721 simultaneously support the pipe fitting 300.

[0031] In order to make the left sliding plate 105 move more stably, three guide pins 115 are fixedly installed on the end surface of the left air chamber base 102, and three guide holes are set on the end surface of the left sliding plate 105. The guide holes correspond to the guide pins 115, and the ends of the guide pins 115 are located in the guide holes. When the left sliding plate 105 moves forward and backward, the guide pins 115 play a guiding role.

[0032] Four fine-tuning screws 116 can be provided on the left gland 104. The fine-tuning screws 116 are connected to the upper screw holes of the left gland 104. The ends of the fine-tuning screws 116 are pressed against the outer side of the left tension sleeve connecting shaft 109. The four fine-tuning screws are evenly distributed along the circumferential direction. The fine-tuning screws 116 are provided mainly to adjust the coaxiality of the left tension sleeve connecting shaft 109 and the first pull rod 110. When the fine-tuning screws 116 are used, the screws 113 are slightly loosened, and then the fine-tuning screws 116 are screwed to adjust the coaxiality of the left tension sleeve connecting shaft 109 and the first pull rod 110. The number of the fine-tuning screws 116 can be set to three.

[0033] Similarly, reference Figure 2 and 7 , multiple fine-tuning screws 722 can also be connected to the right gland 711 of the tailstock connection device 700, and the fine-tuning screws 722 are connected to the screw holes on the right gland 711, and the ends of the fine-tuning screws 722 are against the outer side of the right tension sleeve connecting shaft 718. The number of fine-tuning screws 722 can be three or four, and they are evenly distributed along the circumferential direction. The purpose of setting the fine-tuning screws 722 is mainly to adjust the coaxiality of the right tension sleeve connecting shaft 718 and the second pull rod 719. When using the fine-tuning screws 722, loosen the screws 720 slightly, and then screw the fine-tuning screws 722 to adjust the coaxiality of the right tension sleeve connecting shaft 718 and the second pull rod 719.

[0034] The pneumatic internal expansion tooling for machine tools performs internal support fixing on both ends of the pipe fitting to ensure coaxiality and ensure the processing quality of the pipe fitting. The operation is simple and fast, which is conducive to improving processing efficiency. It is not easy to be damaged after long-term use and does not need to be replaced. In some cases, the coaxiality between the right tension sleeve connecting shaft 718 and the second pull rod 719, the left tension sleeve connecting shaft 109 and the first pull rod 110, and the pipe fitting 300 can be improved by adjusting the fine-tuning screw 722 and the fine-tuning screw 116.

[0035] When the tailstock connection device 700 is used alone, it is not used in conjunction with the left chuck 100. The support base 701 of the tailstock connection device 700 is fixedly installed on the rear tailstock of the machine tool. The tailstock connection device 700 replaces the core shaft in the prior art. When processing the pipe fitting, the chuck of the machine tool fixes one end of the pipe fitting by clamping or internal support, and the other end of the pipe fitting is fixed by the tailstock connection device 700. Specifically, compressed air is input into the tailstock connection device 700 through the compressed air inlet and outlet channel 701-1, and the second pull rod 719 moves to the left to make the right tension sleeve 721 in a relaxed state, and then the right end of the pipe fitting is sleeved on the right tension sleeve 721, and the tailstock connection device 700 is depressurized, and the force of the compressed air disappears. The right tension sleeve 721 is in a tightened state and then internally supports the other end of the pipe fitting. At this point, the pipe fitting is positioned, and the chuck of the machine tool rotates to rotate the pipe fitting for processing. It can be seen that the processing process does not require a mandrel, which reduces costs, the pipe fitting and the tailstock connection device 700 have high coaxiality, the disassembly and assembly operations are fast and convenient, which saves work time and improves the efficiency of batch processing operations.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes.

Claims

1. A tailstock connection device, characterized in that: It includes a support seat, a connecting shaft, a needle roller bearing, a tail positioning sleeve, a self-aligning ball bearing, an elastic retaining ring, a bearing retaining sleeve, a right air chamber base, a right pressure cover, a right sliding disk, a second nut seat, a right tensioning sleeve connecting shaft, a second pull rod and a right tensioning sleeve. The support seat is provided with an axial center through hole, the connecting shaft is located in the axial center through hole, the rear end of the connecting shaft is rotatably connected to the rear end of the support seat through a needle roller bearing, and the tail positioning sleeve is connected to the rear end of the support seat; the front end of the support seat is provided with a bearing chamber, the self-aligning ball bearing is located in the bearing chamber, the front part of the connecting shaft is connected to the inner ring of the self-aligning ball bearing, the elastic retaining ring The ring is located at the bottom of the bearing chamber at the front end of the support seat, and the self-aligning ball bearing presses down the elastic retaining ring. The bearing retaining sleeve is sleeved on the front part of the connecting shaft, and the bearing retaining sleeve is connected to the opening of the bearing chamber at the front end of the support seat; two sealing rings are connected between the connecting shaft and the support seat, and the front end of the connecting shaft is a disc part, which is fixedly connected to the right air cavity base by multiple screws; the support seat is provided with a compressed air inlet and outlet channel, and the connecting shaft is provided with a circumferential arc groove, a side air hole and an axial air hole, the side air hole is connected to the circumferential arc groove, the axial air hole is connected to the side air hole, and the compressed air inlet and outlet channel is connected to the side air hole The holes are connected; two sealing rings between the connecting shaft and the support seat are located on both sides of the side air holes; the right air cavity base is provided with a chamber, and the central part of the right air cavity base is provided with a guide hole, and the guide hole is connected with the axial air hole of the connecting shaft; the right pressure cover is fixedly connected to the right air cavity base by multiple screws, the right sliding disk is located in the chamber of the right air cavity base, and a sealing ring is connected between the periphery of the right sliding disk and the side wall of the chamber of the right air cavity base, the inner side surface of the right pressure cover is provided with a spring positioning groove, and a spring is provided in the spring positioning groove of the right pressure cover, and the left end surface of the right sliding disk is in contact with the spring on the right pressure cover, and multiple springs are provided; The right end of the right sliding disk is provided with an axial air inlet hole and a side air inlet hole which are connected together, and there are multiple side air inlet holes, which are connected to the chamber of the right air cavity base; the right end of the right sliding disk is located in the guide hole of the right air cavity base and can slide; the second nut seat is fixedly connected to the middle part of the left end surface of the right sliding disk by screws; the right tensioning sleeve connecting shaft is fixedly connected to the right pressure cover by multiple screws; the right tensioning sleeve connecting shaft is provided with a guide through hole, the second pull rod passes through the guide through hole of the right tensioning sleeve connecting shaft and can slide, and the right tensioning sleeve is sleeved on the left end portion of the second pull rod and the left end of the right tensioning sleeve connecting shaft.

2. The tailstock connection device according to claim 1, characterized in that: The number of springs is three, four or six.

3. The tailstock connection device according to claim 1, characterized in that: The right gland is connected with a fine-tuning screw, and the end of the fine-tuning screw abuts against the outer side of the right tension sleeve connecting shaft.

4. The tailstock connection device according to claim 3, characterized in that: The number of the fine-tuning screws is three or four.

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