Rolling connection equipment and logic control method and control system thereof

Abstract

The invention discloses rolling connection equipment and a logic control method and control system thereof, and relates to the technical field of pipe forming machining, and the equipment comprises an expansion device, a radial floating handle, a rotating motor and an axial driving motor; the expansion device comprises a rubber ring, a plastic sleeve, a pipe sleeve limiter, a fixer, a shaft sleeve and a conical mandrel which are coaxially and horizontally arranged; the rubber ring is used for being in interference fit between the fixator and the catheter and assisting in fixing the catheter; the shaft sleeve is sleeved with the plastic sleeve; a groove through hole is formed in the side wall of the shaft sleeve; a pin roller and an elastic magnetic pin roller retainer are fixedly mounted in the hole; the axial driving motor is used for driving the rotating motor to move back and forth; a rotating shaft of the rotating motor is connected with the mandrel through a radial floating handle. According to the invention, dual control means of moment and time are adopted in the rolling process, so that micro-stress rolling is realized; the equipment structure can avoid axial movement of the guide pipe, prevent the pin rollers from falling off, ensure uniform distribution of stress in a rolling area, reduce the requirement for equipment manufacturing precision and prevent the guide pipe from being scratched by the shaft sleeve.

Description

Technical Field

[0001] The present invention relates to the technical field of tube forming processing, and in particular to a rolling connection device and a logic control method and control system thereof. Background Art

[0002] The non-flaring tube rolling connection equipment is a device used for forming and expanding the inner diameter of tubes in the tube forming process. The expander end of the non-flaring tube rolling connection equipment is equipped with a sleeve with several receiving grooves for accommodating rollers. The receiving grooves and the sleeve form a certain angle (usually about 1.5° to 5°). When in use, the rollers are moved to the area to be rolled, and the motor drives the mandrel to rotate. The mandrel then drives the rollers to rotate. The axial force generated by the angle between the mandrel and the rollers drags the mandrel into the metal tube. The rollers gradually expand outward as the mandrel penetrates deeper and drives the expander to rotate, squeezing the metal tube to achieve the purpose of connection.

[0003] The existing above-mentioned equipment has the following deficiencies:

[0004] 1) Currently, the industry generally adopts the method of increasing the rolling torque for rolling connections of large-sized conduits. Because a small torque cannot achieve a good rolling effect, but a large torque also brings large stress. The stress concentration reduces the fatigue life of the rolled connection, which is a deep problem for the entire industry.

[0005] 2) The currently commonly used tube rolling method has the problem of axial movement in the rolling area, resulting in the actual axial rolling area being larger than the theoretical axial rolling area. The reason is that the axial rolling torque is transmitted to the product, and the axial force generated between the core shaft and the roller causes axial movement of both the roller and the tube, and the rolling area also moves accordingly, ultimately resulting in uneven rolling.

[0006] 3) The structure is complex and uses a rotational torque drive mode. The rolling torque is transmitted from the motor to the core shaft, and then the radial torque generated by the angle between the core shaft and the roller is transmitted to the roller. Due to the existence of the intermediate transition chain and the torque conversion (converting the torsional torque into axial tension and radial expansion force), the torque transmission is non-linear, so it cannot be precisely controlled, resulting in an unstable inner diameter of the catheter after rolling.

[0007] 4) The rollers in the expander of the rolling equipment are all equipped with a spring outside the sleeve and a rubber ring connected to the front end of the spring to prevent the rollers from falling off. This structure is prone to roller falling off;

[0008] 5) There is a large gap between the expander and the tube, which cannot effectively ensure the concentricity of the equipment and the tube, resulting in uneven stress in the rolling area;

[0009] 6) Since the bushing has a relatively large shaking space, the bushing often contacts the inner wall of the pipe during the rolling process, and finally scratches the conduit. Summary of the Invention

[0010] The present invention aims to provide a rolling connection device, its logic control method and control system, which can solve the above problems.

[0011] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0012] In a first aspect, the present invention provides a rolling connection device, including a swaging device, a radially floating handle, a rotating motor and an axial driving motor;

[0013] The swaging device includes a rubber ring, a plastic sleeve, a pipe sleeve limiter, a fixer, a bushing and a mandrel which are coaxially and horizontally arranged; the fixer is used for internally placing a conduit with a pipe sleeve, and it includes upper and lower halves that are detachably fitted; the pipe sleeve limiter is detachably installed in the fixer and is used for axially limiting the axial positions of the pipe sleeve, the conduit and the bushing; the bushing is installed in the pipe sleeve limiter and can rotate driven by the mandrel, and is used for being internally placed in the conduit; the rubber ring is used for interference-fitting between the fixer and the conduit and assisting in fixing the conduit; the plastic sleeve is sleeved on the bushing to prevent the outer wall of the bushing from directly contacting the inner wall of the conduit; a slot is provided on the side wall of the bushing, and the slot penetrates through the plastic sleeve, and rollers and a fixed roller cage are installed in the slot, and the roller cage has magnetic attraction; the mandrel is a tapered shaft with a smaller front part and a larger rear part. When the mandrel moves forward and presses the roller cage, the roller cage can undergo elastic deformation and push a part of the cylindrical surface of the roller to protrude outside the slot of the bushing to contact the inner wall of the conduit. When the roller cage is not pressed by the mandrel, under the magnetic attraction of the roller cage, the roller returns to the slot of the bushing;

[0014] The axial driving motor is used for driving the rotating motor to move forward and backward; the rotating shaft of the rotating motor is connected to the mandrel through a radially floating handle to drive the mandrel to rotate.

[0015] As a further description of the above technical solution, the axial driving motor, the rotating motor and the fixer are all installed on the device main body.

[0016] As a further description of the above technical solution, the fixture is installed on the equipment main body through a clamping mechanism; the clamping mechanism includes a support seat, a pressing block, a connecting rod and a handle; the upper and lower halves of the fixture are respectively detachably fixed to the pressing block and the support seat; the support seat is fixed to the equipment main body; the pressing block and the connecting rod are both rotatably connected to the support seat; the free end of the connecting rod is threadedly connected to the handle; the handle can press down the free end of the pressing block, so that the pressing block fits the upper and lower halves of the fixture together.

[0017] As a further description of the above technical solution, the equipment main body horizontally installs a lead screw and a guide rail arranged in the front-rear direction. The lead screw is configured with a lead screw nut. The lead screw nut is fixedly provided with a nut seat. The nut seat is fixedly connected to the base of the rotary motor. The guide rail is slidably assembled with a slider. The slider is fixedly connected to the base of the rotary motor.

[0018] As a further description of the above technical solution, the equipment main body installs an operation panel through a support arm with two rotating joints. The working parameters of the axial drive motor and the rotary motor can be set through the operation panel.

[0019] As a further description of the above technical solution, a radial thrust bearing is arranged between the shaft sleeve and the pipe sleeve limiter. The pipe sleeve limiter is provided with a bearing baffle for blocking the axial movement of the radial thrust bearing.

[0020] As a further description of the above technical solution, the rubber ring is made of polyurethane material, and the plastic sleeve is made of polytetrafluoroethylene material; the rubber ring is divided into upper and lower halves, and is respectively in interference fit with the card slots opened in the upper and lower halves of the fixture.

[0021] As a further description of the above technical solution, the shaft sleeve has three slot holes, and the inner wall of the slot hole is provided with a slot. A roller and a roller cage are arranged in each slot hole; the roller cage is a thin-wall sheet metal structure, and is provided with a semi-circular groove for fitting the roller and a protrusion for clamping in the slot.

[0022] In a second aspect, the present invention provides a logic control method for the rolling connection equipment described in the first aspect, which is characterized in that the working parameters of the rotary motor and the axial drive motor can be set, and dual control of the rolling torque and time can be achieved.

[0023] In a third aspect, the present invention provides a control system, including a PLC, and the logic control method described in the second aspect can be implemented based on the PLC.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1) The present invention innovatively adopts a dual control method of torque and time for the rolling process. Both the torque and time of rolling can be set and modified according to actual needs, and for the first time, a rolling method of micro-stress rolling (small torque for a long time) is realized, breaking the passive situation in the current industry where only torque control can be used for rolling connection, and opening a new chapter for the rolling connection control method.

[0026] 2) The present invention is provided with axial positioning, which is respectively axially positioned by a clamping mechanism, a fixator, a bushing limiter and a shaft sleeve. All the axial component torques generated by the rolling torque are borne by the equipment and will not be transmitted to the catheter, thus avoiding the axial movement of the catheter and the unevenness of the rolling area.

[0027] 3) The present invention adopts an axial torque drive mode for rolling. Compared with the currently commonly used rotational torque drive mode, the transmission system of this equipment is simple, eliminating many unnecessary links. The axial drive motor directly provides the rolling torque required for rolling and the torque is displayed on the control panel, achieving the purpose of precise control and ensuring the consistency of the rolling process at the same time.

[0028] 4) The present invention innovatively adopts a roller cage, which is used in conjunction with the angles of the three grooves on the shaft sleeve. It can not only prevent the rollers from falling inside the three grooves of the shaft sleeve, but also prevent the rollers from falling outside the grooves, ensuring the smoothness of the entire rolling process; the roller cage is magnetized and can adsorb the rollers to prevent the rollers from protruding from the outer surface of the shaft sleeve during non-working hours, preventing the catheter from being stuck by the rollers during disassembly and assembly, making the disassembly and assembly of the equipment tooling very smooth during the rolling process, saving the preparation time for rolling connection and improving the production efficiency of the equipment;

[0029] 5) Since the present equipment is added with a radial floating handle, the axis of the expander can float and be adapted to the axis of the rotating motor, solving the problem of non-concentricity caused by manufacturing errors of the equipment, and finally ensuring that the rollers are evenly distributed in the rolling area inside the catheter, ensuring uniform stress distribution in the rolling area, greatly improving the fatigue life of the rolling connection parts, and at the same time reducing the manufacturing precision requirements of the equipment and the production and manufacturing costs of the equipment;

[0030] 6) The present invention patent adds a plastic sleeve on the shaft sleeve. The plastic sleeve itself is made of plastic materials such as polytetrafluoroethylene. There is an interference fit between the shaft sleeve and the plastic sleeve, avoiding the possibility of direct contact between the shaft sleeve and the catheter, and finally solving the problem of scratching the catheter by the equipment tooling during the rolling process;

[0031] 7) Since the structure of the present equipment is simple, it omits the currently commonly used expander body, expander clamping device, lock nut, adjusting nut, wave disc spring, etc., reducing the overall manufacturing cost of the equipment.

[0032] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following specifically presents embodiments of the present invention and, in conjunction with the accompanying drawings, provides a detailed description as follows. Brief Description of the Drawings

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0034] Figure 1 is a schematic diagram of the overall device;

[0035] Figure 2 is a schematic diagram of the lead screw drive;

[0036] Figure 3 is a schematic diagram of the mold expanding device;

[0037] Figure 4 is a schematic diagram of the support structure;

[0038] Figure 5 is a schematic cross-sectional view of the bushing roller;

[0039] Figure 6 is a schematic assembly view of the bushing roller;

[0040] Figure 7 is a schematic diagram of the roller cage;

[0041] Figure 8 is a front schematic view of the clamping mechanism;

[0042] Figure 9 is a side schematic view of the clamping mechanism;

[0043] Figure 10 is a front cross-sectional view of the clamping mechanism;

[0044] Figure 11 is a side cross-sectional view of the clamping mechanism;

[0045] Figure 12 is a top cross-sectional view of the clamping mechanism;

[0046] Figure 13 is a flowchart of the control system;

[0047] In the figure: 1. Control panel; 2. Rotating motor; 3. Axial drive motor; 31. Screw; 32. Screw nut; 33. Nut seat; 4. Guide rail; 5. Slider; 6. Equipment body; 7. Radial floating handle; 8. Expander; 81. Rubber ring; 810. Roller cage; 82. Plastic sleeve; 83. Sleeve limiter; 84. Fixer; 85. Radial thrust bearing; 86. Bearing baffle; 87. Bushing; 88. Core shaft; 89. Roller; 9. Clamping mechanism; 91. Handle; 92. Pressure block; 93. Connecting rod; 94. Support seat; 10. Conduit; 11. Sleeve. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0049] Please refer to Figure 1 An embodiment of the present invention discloses a rolling connection device, including a control panel 1, a rotating motor 2, an axial drive motor 3, a guide rail 4, a slider 5, a device body 6, a radial floating handle 7, an expander 8 and a clamping mechanism 9.

[0050] The control panel 1 is installed on the equipment body 6 and is equipped with a touch screen, which can realize the display and operation control of the catheter rolling speed, core shaft axial feed speed and torque; at the same time, it has two joints, which can realize the adjustment of the distance and direction of the control panel, making it convenient for the operator to adjust and work according to his own height and other conditions.

[0051] The rotary motor 2 provides the rotational torque required for rolling, and realizes axial feed and retraction movement on the guide rail 4 through the slider 5; the power to drive the axial movement of the rotary motor 2 is provided by the axial drive motor 3; the rotating shaft of the axial drive motor 3 is connected to the screw 31 through the bevel gear set, and the axial movement is transmitted through the screw 31, the screw nut 32, and the nut seat 33; the nut seat 33 is connected to the rotary motor 2, the screw nut 32 is connected to the nut seat 33, the screw 31 is assembled in the screw nut 32, and the axial drive motor 3 drives the screw 31 to rotate. Figure 2 shown.

[0052] The equipment body 6 is the main load-bearing structural member, on which the control panel 1, axial drive motor 3, guide rail 4, and clamping mechanism 9 are all installed; at the same time, the equipment body 6 is equipped with control system hardware such as PLC, which can control the rotation direction and speed of the rotating motor 2, the rotation direction and torque of the axial drive motor, the display interface of the control panel 1, and the emergency stop of the equipment; the upper surface of the equipment body 6 is designed with grooves to accommodate transmission mechanisms such as the screw rod 31, and the equipment body 6 is provided with power on, power off, and emergency stop control buttons.

[0053] The radially floating handle 7 can be radially offset and floated according to the applied radial force. Its main function is to eliminate the slight non - concentricity between the rotating motor 2 and the swaging tool 8, avoid scratching the inner wall of the conduit 10 by the swaging tool 8 during the rolling connection process, and also eliminate the uneven force in the rolling area, which can improve the fatigue performance of the conduit connection.

[0054] The main function of the swaging tool 8 is to perform a rolling connection on the conduit 10. As Figure 3 shown, the parts it includes are: rubber ring 81, plastic sleeve 82, bushing limiter 83, retainer 84, radial thrust bearing 85, bearing baffle 86, bushing 87 and mandrel 88. See Figure 3 shown, among which, the conduit 10 and the bushing 11 are the products to be processed.

[0055] The material of the rubber ring 81 is polyurethane plastic, which has a certain elasticity. This part is embedded in the groove of the retainer 84 and has an interference fit with the groove to prevent the rubber ring 81 from falling during the product assembly and installation process; the rubber ring 81 is divided into upper and lower halves. After assembly and clamping, it has an interference extrusion fit with the outer surface of the conduit 10, clamping the conduit 10 to prevent the conduit 10 from rotating and displacing during the rolling process, playing a role in fixing the position of the conduit 10.

[0056] The material of the plastic sleeve 82 is polytetrafluoroethylene plastic. It is installed on the bushing 87. Its main function is to prevent the bushing 87 from scratching the inner surface of the conduit 10; and it has a tight fit with the bushing 87. There are three slot holes on the plastic sleeve 82 to allow the rollers 89 to pass through, that is, the outer surface of the rollers 89 is in direct contact with the conduit 10 to directly roll - press the inner surface of the conduit 10. See Figure 1 、 Figure 5 and Figure 6 shown.

[0057] The bushing limiter 83 is embedded in the retainer 84 and can accommodate the bushing 11, the conduit 10, the radial thrust bearing 85 and the bushing 87 inside.

[0058] The retainer 84 is divided into upper and lower halves, which are respectively connected to the pressure block 92 and the support seat 94 by screws, realizing the axial and radial positioning of the product and the tooling at the same time, and can be lifted upward together with the lifting of the pressure block 92, thus realizing the function of disassembling and removing the product. For details, see Figure 4 .

[0059] The shaft sleeve 87 is provided with a raised retaining ring, which is located between the bearing baffle 86 and the housing of the radial thrust bearing 85. The bearing baffle 86 is connected to the bushing stopper 83 by screws, which can not only assemble the bushing stopper 83 and the shaft sleeve 87 together, but also enable the shaft sleeve 87 to rotate freely under the action of the radial thrust bearing 85 without slipping out therefrom. Secondly, three slot holes are provided on the shaft sleeve 87 and are aligned with the slot holes on the plastic sleeve 82 to accommodate the rollers 89 and the roller cage 810. The inner part of the slot holes on the shaft sleeve presents an angle of about 20° to prevent the rollers 89 from falling out of the slot holes. Separate grooves are provided on the sides of the three slot holes of the shaft sleeve 87 to clamp the protrusions on both sides of the roller cage 810 and firmly hold the roller cage 810, as shown in Figure 3 , Figure 5 and Figure 6 as shown.

[0060] The roller cage 810 is made of thin-walled sheet metal and is provided with an arc-shaped groove for fitting and accommodating the rollers 89, and four protrusions for fitting and clamping in the slot on the side of the slot hole of the shaft sleeve 87. After the rollers 89, the shaft sleeve 87 and the roller cage 810 are assembled together, it can prevent the rollers 89 from falling out of the three slot holes inside the shaft sleeve 87 and also prevent the rollers 89 from falling out of the outside of the slot holes. At the same time, the roller cage 810 is magnetized and can adsorb the rollers 89 to prevent the rollers 89 from protruding from the shaft sleeve 87 during non-working hours (during working hours, it can overcome the magnetic attraction of the roller cage 810 under the action of rotational centrifugal force and protrude outside the shaft sleeve 87), and prevent the catheter 10 from being stuck by the rollers 89 during disassembly and assembly, as shown in Figure 5 and Figure 7 as shown.

[0061] The mandrel 88 is made of high-alloy powder metallurgy high-speed steel, and its hardness reaches 68 HRC or above after heat treatment. This part has a small taper for mating with the rollers 89. The end of the mandrel 88 is connected to the radial floating handle 7, and the radial floating handle 7 drives the mandrel 88 to rotate and feed. The clearance between the mandrel 88 and the shaft sleeve 87 is controlled within 0.08 mm to 0.12 mm, which can ensure the uniform distribution of the mandrel 88 and the rollers 89, ensure the coaxiality of the rolling area, and thus also ensure the uniformity of rolling.

[0062] The clamping mechanism 9 is mainly used for positioning and clamping the bulging device 8. This mechanism includes a pressure block 92, a support seat 94, a handle 91 and a connecting rod 93, as shown in Figures 8 to 12As shown in the figure. The handle 91 is threadedly connected to the connecting rod 93. By rotating the handle forward, the pressing block 92 can be pressed tightly against the support base 94. Grooves are provided inside the pressing block 92 and the support base 94 to accommodate the retainer 84 and achieve clamping and limiting of the retainer 84. The connecting rod 93 is connected to the support base 94 by a pin shaft. The connecting rod 93 can swing around the pin shaft. After rotating the handle backward to a certain extent, enough operating space can be left to swing the connecting rod 93 downward. At this time, the pressing block 92 is released, and the pressing block 92 can be manually lifted to remove the bushing 87 and the rolled product. The support base 94 is connected to the equipment main body 6 by screws and plays a role in support and limitation.

[0063] The method for performing roll - press connection based on the roll - press connection equipment described in the present invention and controlling the roll - press connection equipment is as follows:

[0064] The first step: Connect the power supply of the equipment, start the roll - press connection equipment, and set the system control parameters on the control panel 1, including the spindle speed required for roll - pressing (i.e., the speed of the rotating motor 2), the servo axial feed / retreat speed (i.e., set the speed of the axial drive motor 3), the torque of the mandrel 88 axially extruding the roller 89 (i.e., set the servo torque of the axial drive motor 3), the roll - pressing time and other parameters;

[0065] The second step: Rotate the handle 91 backward to release the pressing block 92, then rotate the handle 91 together with the connecting rod 93 to swing away from the pressing block 92, and then manually lift the pressing block 92;

[0066] The third step: Remove the bushing 87 together with the bushing limiter 8 from the retainer 84, assemble it with the catheter 10 and the bushing 11, and then install the whole into the retainer 84. The assembled position is shown in Figure 3 as shown in the figure;

[0067] The fourth step: Manually press the pressing block 92 against the retainer 84. After lifting the handle 91 together with the connecting rod 93 in the vertical direction, rotate the handle 91 forward to press the pressing block 92 tightly. Thus, the tooling process before product roll - pressing is completed;

[0068] Step 5: Click "Rolling" on the control panel 1. Each component moves according to the set control parameters. The axial drive motor 3 drives the screw 31 to rotate, and then drives the rotary motor 2, the radial floating handle 7, and the core shaft 88 to feed together. At the same time, the rotary motor 2 rotates, and the core shaft 88 is driven to rotate through the radial floating handle 7. When the core shaft 88 enters the sleeve 87 and contacts the roller 89, the roller 89 and the sleeve 87 also begin to rotate in the rolling area under the rotation and axial feeding of the core shaft 88. At the same time, due to the extrusion effect of the conical surface of the core shaft 88, the roller 89 also begins to expand outward. The inner wall of the conduit 10 is squeezed and the rolling connection is performed. The rolling torque display value on the control panel 1 also begins to increase gradually. At this time, the torque of the core shaft 88 squeezing the roller 89 is controlled by the axial drive motor 3 and is displayed in real time on the control panel 1. When the rolling torque reaches the set value, the PLC starts to calculate the rolling time. When the time reaches the rolling time set in the first step, the axial drive motor 3 stops rotating forward and starts to reverse. Driven by the screw rod 31, the core shaft 88 starts to retreat and slowly reset. After the reset is completed, both motors stop rotating and the rolling connection is completed. The control system is shown in FIG. Figure 13 shown.

[0069] Step 6: Release and lift the pressing block 92 again, remove the shaft sleeve 87 together with the pipe sleeve stopper 83, the guide tube 10 and the pipe sleeve 11 from the holder 84, and then remove the guide tube 10 from the pipe sleeve stopper 83.

[0070] Step 7: Reset the device. At this point, the rolling connection process is completed.

[0071] 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 variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rolling connection device, characterized in that, It includes a bulging device (8), a radially floating handle (7), a rotary motor (2) and an axial driving motor (3); The bulging device (8) includes a rubber ring (81), a plastic sleeve (82), a pipe sleeve limiter (83), a fixer (84), a bushing (87) and a mandrel (88) which are coaxially and horizontally arranged; the fixer (84) is used for internally placing a catheter (10) with a pipe sleeve (11), and it includes upper and lower halves which are detachably fitted; the pipe sleeve limiter (83) is detachably installed in the fixer (84), and is used for axially limiting the axial positions of the pipe sleeve (11), the catheter (10) and the bushing (87); the bushing (87) is installed in the pipe sleeve limiter (83) and can rotate driven by the mandrel (88), and is used for being internally placed in the catheter (10); the rubber ring (81) is used for interference fitting between the fixer (84) and the catheter (10), and for assisting in fixing the catheter (10); the plastic sleeve (82) is sleeved on the bushing (87) to prevent the outer wall of the bushing (87) from directly contacting the inner wall of the catheter (10); a slot hole is provided on the side wall of the bushing (87), the slot hole penetrates through the plastic sleeve (82), a roller (89) and a roller cage (810) fixedly installed are installed in the slot hole, and the roller cage (810) has magnetic attraction; the mandrel (88) is a conical shaft with a smaller front part and a larger rear part. When the mandrel (88) moves forward and squeezes the roller cage (810), the roller cage (810) can undergo elastic deformation, and push a part of the cylindrical surface of the roller (89) to protrude outside the slot hole of the bushing (87) to contact the inner wall of the catheter (10). When the roller cage (810) is not squeezed by the mandrel (88), under the magnetic attraction of the roller cage (810), the roller (89) returns to the slot hole of the bushing (87); The axial driving motor (3) is used for driving the rotary motor (2) to move forward and backward; the rotating shaft of the rotary motor (2) is connected to the mandrel (88) through the radially floating handle (7) to drive the mandrel (88) to rotate.

2. The rolling connection device according to claim 1, characterized in that, The axial driving motor (3), the rotary motor (2) and the fixer (84) are all installed on the equipment main body (6).

3. The rolling connection device according to claim 2, characterized in that, The fixer (84) is installed on the equipment main body (6) through a clamping mechanism (9); the clamping mechanism (9) includes a support seat (94), a pressing block (92), a connecting rod (93) and a handle (91); the upper and lower halves of the fixer (84) are respectively detachably fixed to the pressing block (92) and the support seat (94); the support seat (94) is fixed to the equipment main body (6); the pressing block (92) and the connecting rod (93) are both rotatably connected to the support seat (94); the free end of the connecting rod (93) is threadedly connected to the handle (91); the handle (91) can press down the free end of the pressing block (92) to make the pressing block (92) fit the upper and lower halves of the fixer (84) together.

4. The rolling connection device according to claim 2, characterized in that, The main body of the device (6) is horizontally installed with a lead screw (31) and a guide rail (4) arranged in the front-back direction. The lead screw (31) is configured with a lead screw nut (32). The lead screw nut (32) is fixedly provided with a nut seat (33). The nut seat (33) is fixedly connected to the base of the rotary motor (2). The guide rail (4) is slidably assembled with a slider (5). The slider (5) is fixedly connected to the base of the rotary motor (2).

5. The rolling connection device according to claim 2, characterized in that, The main body of the device (6) installs the control panel (1) through a support arm with two rotating joints. The working parameters of the axial drive motor (3) and the rotary motor (2) can be set through the operation panel.

6. The rolling connection device according to claim 1, characterized in that, A radial thrust bearing (85) is arranged between the bushing (87) and the bushing limiter (83). The bushing limiter (83) is provided with a bearing baffle (86) for blocking the axial movement of the radial thrust bearing (85).

7. The rolling connection device according to claim 1, characterized in that, The rubber ring (81) is made of polyurethane material, and the plastic sleeve (82) is made of polytetrafluoroethylene material. The rubber ring (81) is divided into upper and lower halves, and is respectively in interference fit with the upper and lower half card slots opened in the fixture (84).

8. The rolling connection device according to claim 1, characterized in that, The bushing (87) has three slot holes, and the inner wall of the slot holes is provided with slots. Each slot hole is provided with a roller (89) and a roller cage (810). The roller cage (810) is a thin-walled sheet metal structure, which is provided with a semi-circular groove for cooperating with the roller (89) and a protrusion for clamping in the slot.

9. The logical control method of the rolling connection device according to any one of claims 1 to 8, characterized in that The working parameters of the rotary motor (2) and the axial drive motor (3) can be set, and dual control of the rolling torque and time can be realized.

10. A control system, characterized in that, It includes a PLC, and based on this PLC, the logic control method described in claim 9 can be realized.

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