Precise positioning automatic pipe expanding machine
By providing a tightly fitted screw on the eccentric seat of the pipe expander and positioning the product with the clamping device, the uneven product flaring problem caused by the screw deviating from the central axis in the existing pipe expander is solved, and a more uniform and reliable product flaring effect is achieved.
Patent Information
- Application Number
- CN202421429406.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-21
AI Technical Summary
The existing pipe expansion machine has caused the screw to deviate from the central axis due to the space between the mandrel and the screw, and the mandrel is subjected to uneven force, resulting in uneven flaring of the product and poor extrusion effect. The product identity cannot be guaranteed after multiple use.
An accurate positioning automatic pipe expander is designed. By providing a screw connected to the eccentric seat with a tightly mating connection with it, the two rotate simultaneously, and positioning the product with a clamping device to ensure that the product, the eccentric seat and the mandrel have a good concentricity, and achieving a more uniform and reliable product flaring.
Through precise positioning and synchronous rotation of screws and eccentric seats, the product flaring is ensured to be more uniform and reliable, avoiding the deterioration of the extrusion effect caused by skewed mandrels and improving product identity.
Smart Images
Figure CN222659883U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pipe expanding machines, and in particular relates to a precise positioning automatic pipe expanding machine. Background Art
[0002] A pipe expander is a device that extrude and expand one end of a pipe fitting. Existing pipe expanders usually include a mandrel, a nut and a screw. The mandrel is provided with a pipe expansion cone that is eccentrically connected to it. The mandrel is hollow, and a screw and an elastomer are provided inside the mandrel. The screw can move axially relative to the mandrel. Since there is a large space between the mandrel and the screw, the screw tends to deviate from the center axis when it moves relative to the mandrel. The mandrel is not evenly stressed, and the mandrel and the pipe expansion cone have poor extrusion effects on the product, and the product expansion is not uniform. After the mandrel is skewed, the elastomer is easy to deform, and the deformation effect of the elastomer deteriorates after working for a long time, which leads to the deterioration of the extrusion effect of the mandrel, and the expansion of the product cannot meet the predetermined requirements. At the same time, the concentricity of the clamping device and the mandrel on the pipe expander is poor, and the pipe expander cannot guarantee the identity of the product after repeated use. Therefore, it is necessary to design a precise positioning automatic pipe expander to overcome the above difficulties. Summary of the invention
[0003] In view of the problems existing in the prior art, the utility model designs a precise positioning automatic pipe expanding machine. The utility model provides a screw rod which is tightly connected with the eccentric seat, and there is no gap between the two and they rotate synchronously. The product is positioned by a clamping device, the product, the eccentric seat and the core shaft have good concentricity, and the product expansion is more uniform and reliable.
[0004] The invention objective of the utility model is achieved through the following technical solutions: a precise positioning automatic pipe expanding machine, comprising a shell, in which an outer sleeve and a worm gear box fixedly connected thereto are respectively arranged, and the outer sleeve is provided with a clamping device detachably connected thereto; an eccentric seat capable of sliding relative to the outer sleeve is arranged inside the outer sleeve, and a pipe expanding cone rotatably connected thereto is arranged on the eccentric seat; the outer layer of the outer sleeve is provided with a worm gear body capable of rotating relative to the worm gear body; a screw is arranged inside the eccentric seat that rotates synchronously therewith, and a transmission shaft for transmission is arranged between the screw and the worm gear body; a nut threadedly connected thereto is arranged on the outer layer of the screw, and the nut is slidably connected to the worm gear box; an elastomer is arranged between the nut and the worm gear box, and when the screw drives the nut to rotate, the elastomer deforms and reversely squeezes the nut; a pipe expanding cavity is provided on the clamping device, and the screw and the pipe expanding cavity are coaxially arranged.
[0005] Preferably, the housing is provided with a motor fixedly connected thereto, and also with a worm rotatably connected thereto; the worm and the worm wheel body are meshed with each other, and the motor drives the worm to rotate relative to the housing when working; the outer sleeve of the eccentric seat is provided with a support sleeve tightly fitted therewith, and a shift bearing is provided between the support sleeve and the outer sleeve; the support sleeve extends into the worm wheel body, and the worm wheel body and the support sleeve are slidably connected; a guide groove for installing a transmission shaft is provided in the worm wheel body, and the end of the transmission shaft is arranged in the guide groove; when the worm wheel body drives the screw to move axially relative to the guide groove, the expansion cone on the eccentric seat squeezes and contacts the product in the clamping device.
[0006] When the motor is working, it drives the worm to rotate, and when the worm rotates, it drives the worm wheel body to rotate; the worm wheel body is limited by the displacement bearing and the worm gear box and cannot move axially, and when the worm wheel body rotates, the screw is driven to rotate synchronously through the transmission shaft; the screw and the eccentric seat are tightly connected, so that the eccentric seat rotates relative to the worm wheel body; because the screw and the nut are meshed with each other, an elastic body is provided on the nut, so that the screw and the eccentric seat will move axially along the guide groove; when the motor rotates forward, the eccentric seat and the screw approach the product synchronously; when the motor rotates reversely, the eccentric seat and the screw move away from the product synchronously.
[0007] Preferably, an outer sleeve and a worm gear box are respectively provided on both sides of the screw, the outer sleeve is provided with a first limit switch which is mutually conductive, and the worm gear box is provided with a second limit switch which is mutually conductive; the screw and the transmission shaft are both metal parts, and when the transmission shaft and the shift bearing are in contact, the first limit switch is turned on and sends an electrical signal to the motor; when the screw contacts the second limit switch, the second limit switch sends an electrical signal to the motor.
[0008] When the product is expanding, the motor rotates forward to drive the worm wheel body to rotate, and the rotation of the worm wheel body drives the screw and the eccentric seat to approach the product synchronously; the screw is provided with a transmission shaft, and the transmission shaft will approach the product; because the transmission shaft, displacement bearing and outer sleeve are all metal parts, the first limit switch is turned on when the transmission shaft and the displacement bearing are in contact; at this time, the horn expansion of the product is basically formed, and the motor will rotate in the opposite direction after receiving the signal of the first limit switch and reaching the set rated current, so that the eccentric seat and the screw are away from the product and return to the initial position. When the screw contacts the second limit switch, the eccentric seat is in the default initial position, and the motor stops rotating at this time, and the expansion is completed.
[0009] Preferably, the worm gear body is arranged between the outer sleeve and the worm gear box, and the outer sleeve and the worm gear box surround a limiting cavity for limiting the axial movement of the worm gear body; the screw and the eccentric seat rotate synchronously, and the two are coaxially arranged; the outer layer of the screw is provided with a nut, and the nut is slidably connected to the worm gear box and the two are coaxially arranged; the outer layer of the nut is sleeved with an elastomer, and the elastomer is arranged between the nut and the worm gear box.
[0010] By setting a limit cavity, the axial movement of the worm wheel body is avoided. Since the screw and the eccentric seat are tightly connected, the concentricity of the two is better. At the same time, the end of the screw away from the eccentric seat is limited by the nut, and the screw is limited by the worm gear box, so that the screw, the eccentric seat and the product are always set coaxially. By setting an elastic body, the extrusion force of the eccentric seat on the product is slower and more uniform, the torque of the expansion tube is larger, and the expansion effect is better.
[0011] Preferably, an annular protrusion is provided at the end of the nut, one end of the elastomer abuts against the annular protrusion, and the other end abuts against the inner wall of the worm gear box; the outer layer of the nut is provided with a plurality of annularly distributed limiting protrusions, and the worm gear box is provided with a plurality of annularly distributed limiting grooves, the limiting protrusions are arranged in the limiting grooves and the outer contours of the two match each other; the end of the nut is provided with a retaining spring for limiting its axial stroke, and the retaining spring is arranged on the outside of the worm gear box.
[0012] The elastic body is axially limited by the annular protrusion and the worm gear box to prevent the elastic body from axially moving relative to the nut; the limiting protrusion and the limiting groove cooperate with each other, so that the nut can only move axially relative to the worm gear box, and the two cannot rotate relative to each other. A retaining spring is provided at the end of the nut to prevent the nut from detaching from the worm gear box when moving.
[0013] Preferably, a locating pin for fixing the screw and the eccentric seat is provided between the two, and a mounting groove for installing the locating pin is provided in the eccentric seat; the locating pin passes through the screw and extends into the mounting groove, and an insulating member is provided between the locating pin and the inner wall of the mounting groove; the eccentric seat is a nylon member, and the screw is a metal member; a transmission shaft tightly fitted with the screw is installed on the screw, a guide groove is provided in the worm wheel body, and the end of the transmission shaft is arranged in the guide groove; the guide grooves are arranged in pairs, and the guide grooves extend along the axial direction of the eccentric seat; the screw and the eccentric seat are tightly fitted, and a partition protrusion is provided on the eccentric seat, and the partition protrusion is arranged between the outer wall of the screw and the outer wall of the support sleeve.
[0014] Because the screw, positioning pin, support sleeve, displacement bearing and outer sleeve are all metal parts, and the eccentric seat is a nylon part, an insulating gasket is set to prevent the transmission shaft from directly contacting the first limit switch. By setting a separation protrusion, the transmission shaft is prevented from directly contacting the support sleeve; when the worm body rotates, it drives the screw to rotate, the screw and the eccentric seat move to the left to approach the product, and the nut moves to the right to squeeze the elastic body. At this time, the deformation of the elastic body is small, and the motor does not reach the set rated current; when the bell mouth of the product is basically formed, the expansion cone is basically set in close contact with the bell mouth of the product, and the first limit switch is in the on state. The motor does not immediately reverse because it does not reach the set rated current; at this time, the worm body continues to rotate, the eccentric seat and the screw rotate in place, and the nut moves to the right to squeeze the elastic part; then the elastic body will produce obvious deformation, and the actual working current of the motor will gradually increase; when the actual working current of the motor reaches the set rated current, the motor rotates in the opposite direction, and the eccentric seat and the screw are synchronously away from the product; when the screw contacts the second limit switch, the motor receives an electrical signal and stops rotating immediately.
[0015] Preferably, the eccentric seat and the screw are integrally formed, the screw is a metal part, and the eccentric seat is a nylon part; a transmission shaft is provided between the eccentric seat and the screw and passes through the two, a guide groove for installing the transmission shaft is provided on the worm gear body, and the end of the transmission shaft is arranged in the guide groove; the transmission shaft is a metal part, and a gap is provided between the transmission shaft and the support sleeve.
[0016] When the eccentric seat is actually processed, the eccentric seat and the screw are formed into one piece through the plastic injection process; in this way, there is no gap at all between the eccentric seat and the screw, and the two have better concentricity; at the same time, the eccentric seat is made of nylon as a whole, so the insulation effect between the eccentric seat and the screw is better.
[0017] Preferably, the outer sleeve and the clamping device are detachably connected; a positioning protrusion is provided on the outer sleeve, and the clamping device includes a positioning groove that cooperates with the positioning protrusion, and the positioning protrusion is stuck in the positioning groove when the clamping device is installed on the outer sleeve; a locking device is provided in the clamping device, and the locking device is arranged between the positioning groove and the positioning protrusion.
[0018] When installing the clamping device, the clamping device is rotated so that the positioning protrusion and the positioning groove match each other, so that the clamping device is clamped to the open end of the outer sleeve. Then the clamping device is locked by the locking device on the clamping device, so that the locking device locks the clamping device to prevent the clamping device from being disengaged from the outer sleeve.
[0019] Preferably, the locking device includes a mounting sleeve, a first spring and a limiting bead; the clamping device includes a first clamping piece, the mounting sleeve is fixedly installed in the first clamping piece, and the mounting sleeve is provided with a first spring and a limiting bead; one end of the first spring abuts against the mounting sleeve, and the other end abuts against the limiting bead; the outer diameter of the limiting bead is matched with the inner diameter of the mounting sleeve and the limiting bead can move relative to the mounting sleeve; the diameter of the open end of the mounting sleeve is smaller than the outer diameter of the limiting bead; the positioning protrusion is provided with a placement notch for placing the limiting bead, and the outer contour of the placement notch matches the outer contour of the limiting bead.
[0020] When the clamping device is installed on the outer sleeve, the first groove on the first clamping member rotates relative to the positioning protrusion on the outer sleeve; at this time, the limit bead will be extended and retracted inside the installation sleeve, and when the installation sleeve and the placement notch are aligned, the limit bead will be stuck in the placement notch under the action of the first spring, so that the locking device will be in a locked state. When the clamping device needs to be removed, the clamping device is rotated, and the limit bead automatically disengages from the placement notch, so that the clamping device can be removed as a whole.
[0021] Preferably, the clamping device comprises a first clamping member, a second clamping member, a switch handle, a blocking member and a reset elastic member; a first pin shaft is provided between the first clamping member and the second clamping member to hinge the two, and a second pin shaft is provided between the first clamping member and the switch handle to hinge the two; a connecting rod is provided between the switch handle and the second clamping member to connect the two, and the connecting rods are arranged in pairs; one end of the connecting rod is hinged to the switch handle, and the other end of the connecting rod is hinged to the second clamping member; when the first clamping member and the second clamping member are in contact, an expansion tube cavity for placing the product is formed, and the expansion tube cavity and the eccentric seat are arranged coaxially; a positioning member is also provided between the first clamping member and the second clamping member, one end of the positioning member is fixedly installed in the second clamping member, and the other end of the positioning member extends into the first clamping member; a blocking member is provided on the first pin shaft and is rotatably connected to it, and a reset elastic member is provided between the blocking member and the second clamping member.
[0022] When expanding the product, first remove the clamping device from the housing; then turn the switch handle, the switch handle is hinged to the first clamping member through the second pin shaft, a connecting rod connecting the switch handle and the second clamping member is provided between the switch handle and the second clamping member, and the two ends of the connecting rod are respectively hinged to the switch handle and the second clamping member; therefore, when the switch handle is turned, the first clamping member and the second clamping member will move away from each other, so that the product can be placed between the first clamping member and the second clamping member. The first pin shaft is provided with a blocking member and a reset elastic member, the reset elastic member is a torsion spring, one pin of the torsion spring is installed on the second clamping member, and the other pin of the torsion spring is installed against the blocking member, and the body of the torsion spring is inserted on the first pin shaft; when the product is placed, the end of the product fits the blocking member, and then the switch handle is turned to lock the first clamping member and the second clamping member, so that the product will be stuck in the expansion tube cavity; by setting the blocking member, it is convenient to set the insertion depth of the product to ensure that the position of the product is uniform each time. Then install the clamping device on the outer sleeve, align the positioning protrusion and the positioning groove, then rotate the blocking member to move it away from the expansion cavity, and then rotate the clamping device at the same time, so that the clamping device can be reliably clamped on the outer sleeve; this ensures that the expansion cavity and the eccentric seat have better concentricity, the clamping device will not be skewed during operation, and the product's expansion effect is better.
[0023] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides a screw in the eccentric seat that is tightly connected to the eccentric seat, and the two have better concentricity when they rotate synchronously; the end of the screw is provided with a nut that is threadedly connected to the eccentric seat, and the nut is slidably connected to the worm gear box; the screw is further limited by the nut, so that the screw will not be skewed when it is outside the eccentric seat, and the screw as a whole and the eccentric seat are always on the central axis, and the screw is always aligned with the product. By arranging an elastomer between the nut and the worm gear box, the nut slowly squeezes the elastomer when moving, and the elastic force of the elastomer reacts to the screw and the nut, so that the expansion cone on the eccentric seat will slowly squeeze the product, and the expansion effect of the product is better and the expansion is more uniform; by arranging a detachable clamping device on the outer sleeve, it is convenient to position the product and place the product more conveniently. Since the expansion cavity of the clamping device and the eccentric seat are coaxially arranged, the eccentric seat is always aligned with the product, and the expansion of the product is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a three-dimensional diagram of the hidden part of the housing of the utility model;
[0025] Figure 2 A three-dimensional diagram of the hidden part of the housing of the utility model from another perspective;
[0026] Figure 3 is a three-dimensional diagram of the clamping device;
[0027] Figure 4 is the internal structure diagram of the clamping device;
[0028] Figure 5 It is an exploded view of the utility model;
[0029] Figure 6 An exploded view of the clamping device;
[0030] Figure 7 This is an internal structure diagram of the first embodiment of the utility model;
[0031] Figure 8 This is an exploded view of the first embodiment of the utility model;
[0032] Fig. 9 This is an internal structure diagram of the second embodiment of the utility model;
[0033] Fig.10 It is an exploded view of the second embodiment of the utility model.
[0034] Markings in the figure: 1, housing; 2, outer sleeve; 201, positioning protrusion; 202, placement notch; 3, worm gear box; 31, limiting groove; 4, clamping device; 41, first clamping member; 42, second clamping member; 43, switch handle; 44, blocking member; 45, reset elastic member; 46, first pin shaft; 47, second pin shaft; 48, connecting rod; 49, positioning member; 5, locking device; 51, mounting sleeve; 52, first spring; 53, limiting bead; 6, eccentric seat; 61, installation Grooving; 62, separation protrusion; 7, expansion cone; 8, worm wheel body; 81, guide groove; 9, screw; 10, transmission shaft; 11, nut; 111, annular protrusion; 112, limit protrusion; 12, elastic body; 13, expansion cavity; 14, motor; 15, worm; 16, support sleeve; 17, shift bearing; 18, first limit switch; 19, second limit switch; 20, limit cavity; 21, retaining spring; 22, positioning pin; 23, insulating member; 24, positioning groove; DETAILED DESCRIPTION
[0035] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:
[0036] Example 1
[0037] like Figures 1 to 8As shown, the present embodiment discloses a precise positioning automatic pipe expanding machine, comprising a shell 1, in which an outer sleeve 2 and a worm gear box 3 fixedly connected thereto are respectively provided, and the outer sleeve 2 is provided with a clamping device 4 detachably connected thereto; an eccentric seat 6 capable of sliding relative to the outer sleeve 2 is provided therein, and a pipe expanding cone 7 rotatably connected thereto is provided on the eccentric seat 6; the outer layer of the outer sleeve 2 is provided with a worm gear body 8 capable of rotating relative to the worm gear body; a screw 9 capable of rotating synchronously therewith is provided therein, and a transmission shaft 10 for transmission is provided between the screw 9 and the worm gear body 8; a nut 11 threadedly connected thereto is provided on the outer layer of the screw 9, and the nut 11 is slidably connected to the worm gear box 3; an elastomer 12 is provided between the nut 11 and the worm gear box 3, and when the screw 9 drives the nut 11 to rotate, the elastomer 12 deforms and reversely squeezes the nut 11; a pipe expanding cavity 13 is provided on the clamping device 4, and the screw 9 and the pipe expanding cavity 13 are coaxially arranged.
[0038] The housing 1 is provided with a motor 14 fixedly connected thereto, and is also provided with a worm 15 rotatably connected thereto; the worm 15 and the worm wheel body 8 are meshed with each other, and the motor 14 drives the worm 15 to rotate relative to the housing 1 when working; the outer sleeve of the eccentric seat 6 is provided with a support sleeve 16 tightly fitted therewith, and a shift bearing 17 is provided between the support sleeve 16 and the outer sleeve 2; the support sleeve 16 extends into the worm wheel body 8, and the worm wheel body 8 and the support sleeve 16 are slidably connected; a guide groove 81 for installing the transmission shaft 10 is provided in the worm wheel body 8, and the end of the transmission shaft 10 is arranged in the guide groove 81; when the worm wheel body 8 drives the screw 9 to move axially relative to the guide groove 81, the expansion cone 7 on the eccentric seat 6 squeezes and contacts the product in the clamping device 4. An outer sleeve 2 and a worm gear box 3 are respectively provided on both sides of the screw 9. The outer sleeve 2 is provided with a first limit switch 18 which is mutually conductive, and the worm gear box 3 is provided with a second limit switch 19 which is mutually conductive. The screw 9 and the transmission shaft 10 are both metal parts. When the transmission shaft 10 is in contact with the displacement bearing 17, the first limit switch 18 is turned on and sends an electrical signal to the motor 14. When the screw 9 contacts the second limit switch 19, the second limit switch 19 sends an electrical signal to the motor 14.
[0039] The worm gear body 8 is arranged between the outer sleeve 2 and the worm gear box 3, and the outer sleeve 2 and the worm gear box 3 surround a limiting cavity 20 for limiting the axial movement of the worm gear body 8; the screw 9 and the eccentric seat 6 rotate synchronously, and the two are coaxially arranged; the outer layer of the screw 9 is provided with a nut 11, and the nut 11 is slidably connected with the worm gear box 3 and the two are coaxially arranged; the outer layer of the nut 11 is sleeved with an elastomer 12, and the elastomer 12 is arranged between the nut 11 and the worm gear box 3. An annular protrusion 111 is provided at the end of the nut 11, one end of the elastomer 12 abuts against the annular protrusion 111, and the other end abuts against the inner wall of the worm gear box 3; the outer layer of the nut 11 is provided with a plurality of annularly distributed limiting protrusions 112, and the worm gear box 3 is provided with a plurality of annularly distributed limiting grooves 31, the limiting protrusions 112 are arranged in the limiting grooves 31 and the outer contours of the two match each other; a retaining spring 21 for limiting its axial stroke is provided at the end of the nut 11, and the retaining spring 21 is arranged on the outside of the worm gear box 3. A locating pin 22 is provided between the screw rod 9 and the eccentric seat 6 to fix the two, and a mounting groove 61 for installing the locating pin 22 is provided in the eccentric seat 6; the locating pin 22 passes through the screw rod 9 and extends into the mounting groove 61, and an insulating member 23 is provided between the locating pin 22 and the inner wall of the mounting groove 61; the eccentric seat 6 is a nylon member, and the screw rod 9 is a metal member; a transmission shaft 10 tightly fitted and connected thereto is installed on the screw rod 9, a guide groove 81 is provided in the worm wheel body 8, and the end of the transmission shaft 10 is arranged in the guide groove 81; the guide grooves 81 are arranged in pairs, and the guide grooves 81 extend along the axial direction of the eccentric seat 6; the screw rod 9 and the eccentric seat 6 are tightly fitted, and a separation protrusion 62 is provided on the eccentric seat 6, and the separation protrusion 62 is arranged between the outer wall of the screw rod 9 and the outer wall of the support sleeve 16.
[0040] The outer sleeve 2 and the clamping device 4 are detachably connected; a positioning protrusion 201 is provided on the outer sleeve 2, and the clamping device 4 includes a positioning groove 24 that cooperates with the positioning protrusion 201, and the positioning protrusion 201 is stuck in the positioning groove 24 when the clamping device 4 is installed on the outer sleeve 2; a locking device 5 is provided in the clamping device 4, and the locking device 5 is arranged between the positioning groove 24 and the positioning protrusion 201. The locking device 5 includes a mounting sleeve 51, a first spring 52 and a limiting bead 53; the clamping device 4 includes a first clamping member 41, the mounting sleeve 51 is fixedly mounted in the first clamping member 41, and a first spring 52 and a limiting bead 53 are arranged in the mounting sleeve 51; one end of the first spring 52 abuts against the mounting sleeve 51, and the other end abuts against the limiting bead 53; the outer diameter of the limiting bead 53 is matched with the inner diameter of the mounting sleeve 51 and the limiting bead 53 can move relative to the mounting sleeve 51; the diameter of the opening end of the mounting sleeve 51 is smaller than the outer diameter of the limiting bead 53; the positioning protrusion 201 is provided with a placement notch 202 for placing the limiting bead 53, and the outer contour of the placement notch 202 matches the outer contour of the limiting bead 53. The clamping device 4 includes a first clamping member 41, a second clamping member 42, a switch handle 43, a blocking member 44 and a reset elastic member 45; a first pin 46 is provided between the first clamping member 41 and the second clamping member 42 to connect the two members, and a second pin 47 is provided between the first clamping member 41 and the switch handle 43 to connect the two members; a connecting rod 48 is provided between the switch handle 43 and the second clamping member 42 to connect the two members, and the connecting rods 48 are arranged in pairs; one end of the connecting rod 48 is hinged to the switch handle 43, and the other end of the connecting rod 48 is hinged to the second Clamping member 42; when the first clamping member 41 and the second clamping member 42 are in contact with each other, an expansion cavity 13 for placing the product is formed, and the expansion cavity 13 and the eccentric seat 6 are coaxially arranged; a positioning member 49 is also provided between the first clamping member 41 and the second clamping member 42, one end of the positioning member 49 is fixedly installed in the second clamping member 42, and the other end of the positioning member 49 extends into the first clamping member 41; a blocking member 44 is provided on the first pin shaft 46 and is rotatably connected thereto, and a reset elastic member 45 is provided between the blocking member 44 and the second clamping member 42.
[0041] The specific operation process of this embodiment is as follows: when the worm wheel body 8 rotates, the screw rod 9 is driven to rotate, the screw rod 9 and the eccentric seat 6 move to the left to approach the product, and the nut 11 moves to the right to extrude the elastic body 12. At this time, the deformation of the elastic body 12 is small, and the motor 14 does not reach the set rated current; when the bell mouth of the product is basically formed, the expansion cone 7 is basically fitted with the bell mouth of the product, and the first limit switch 18 is in the on state. The motor 14 does not immediately reverse because it does not reach the set rated current; at this time, the worm wheel body 8 continues to rotate, the eccentric seat 6 and the screw rod 9 rotate in place, and the nut 11 moves to the right to extrude the elastic body 12; then the elastic body 12 will produce obvious deformation, and the actual working current of the motor 14 will gradually increase; when the actual working current of the motor 14 reaches the set rated current, the motor 14 rotates in the opposite direction, and the eccentric seat 6 and the screw rod 9 are synchronously away from the product; when the screw 9 and the second limit switch 19 are in contact, the motor 14 receives an electrical signal and stops rotating immediately.
[0042] When expanding the product, first remove the clamping device 4 from the shell 1; then rotate the switch handle 43, the switch handle 43 is hinged to the first clamping member 41 through the second pin shaft 47, and a connecting rod 48 is provided between the switch handle 43 and the second clamping member 42 to connect the two, and the two ends of the connecting rod 48 are respectively hinged to the switch handle 43 and the second clamping member 42; therefore, when the switch handle 43 is rotated, the first clamping member 41 and the second clamping member 42 will move away from each other, so that the product can be placed between the first clamping member 41 and the second clamping member 42. The first pin 46 is provided with a blocking member 44 and a reset elastic member 45. The reset elastic member 45 is a torsion spring. One pin of the torsion spring is installed on the second clamping member 42, and the other pin of the torsion spring is installed against the blocking member 44. The body of the torsion spring is inserted into the first pin 46. When the product is placed, the end of the product fits the blocking member 44, and then the switch handle 43 is turned to lock the first clamping member 41 and the second clamping member 42, so that the product will be stuck in the expansion cavity 13. By setting the blocking member 44, it is convenient to set the insertion depth of the product to ensure that the position of the product is uniform each time. Then install the clamping device 4 on the outer sleeve 2, align the positioning protrusion 201 with the positioning groove 24, then rotate the blocking member 44 to keep it away from the expansion cavity 13, and then rotate the clamping device 4 at the same time, so that the clamping device 4 can be reliably stuck on the outer sleeve 2. In this way, it can be ensured that the expansion cavity 13 and the eccentric seat 6 have better concentricity, the clamping device 4 will not be skewed during operation, and the expansion effect of the product is better.
[0043] Example 2
[0044] like Figures 9 and 10As shown, the assembly method of the eccentric seat 6 and the screw 9 of the present embodiment 2 is different from that of the present embodiment 1. The eccentric seat 6 and the screw 9 of the present embodiment are integrally formed, the screw 9 is a metal part, and the eccentric seat 6 is a nylon part; a transmission shaft 10 is provided between the eccentric seat 6 and the screw 9 to penetrate the two, and a guide groove 81 for installing the transmission shaft 10 is provided on the worm body 8, and the end of the transmission shaft 10 is arranged in the guide groove 81; the transmission shaft 10 is a metal part, and a gap is provided between the transmission shaft 10 and the support sleeve 16. When the eccentric seat is actually processed, the eccentric seat 6 and the screw 9 are integrally formed through the plastic injection process; in this way, there is no gap at all between the eccentric seat 6 and the screw 9, and the two have better concentricity; at the same time, the eccentric seat 6 is made of nylon as a whole, so that the insulation effect between the eccentric seat 6 and the screw 9 is better.
[0045] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A precise positioning automatic pipe expanding machine, comprising a housing (1), wherein the housing (1) is provided with an outer shaft sleeve (2) and a worm gear box (3) fixedly connected thereto, respectively, and wherein: The outer sleeve (2) is provided with a clamping device (4) detachably connected thereto; an eccentric seat (6) capable of sliding relative to the outer sleeve (2) is provided inside the outer sleeve (2); the eccentric seat (6) is provided with a tube expansion cone (7) rotatably connected thereto; the outer layer of the outer sleeve (2) is provided with a worm wheel body (8) capable of rotating relative to the outer sleeve; a screw (9) capable of rotating synchronously therewith is provided inside the eccentric seat (6); a transmission shaft (10) for transmission is provided between the screw (9) and the worm wheel body (8); the outer layer of the screw (9) is provided with a nut (11) threadedly connected thereto; the nut (11) is slidably connected to the worm wheel box (3); an elastic body (12) is provided between the nut (11) and the worm wheel box (3); when the screw (9) drives the nut (11) to rotate, the elastic body (12) deforms and reversely squeezes the nut (11); the clamping device (4) is provided with a tube expansion cavity (13); the screw (9) and the tube expansion cavity (13) are coaxially arranged.
2. The precise positioning automatic pipe expanding machine according to claim 1, characterized in that: The housing (1) is provided with a motor (14) fixedly connected thereto, and also with a worm (15) rotatably connected thereto; the worm (15) and the worm wheel body (8) are meshed with each other, and when the motor (14) is in operation, the worm (15) is driven to rotate relative to the housing (1); the outer layer of the eccentric seat (6) is sleeved with a support sleeve (16) tightly fitted therewith, and a displacement bearing (17) is provided between the support sleeve (16) and the outer sleeve (2); the support sleeve (16) extends into the worm wheel body (8), and the worm wheel body (8) and the support sleeve (16) are slidably connected; a guide groove (81) for mounting a transmission shaft (10) is provided in the worm wheel body (8), and the end of the transmission shaft (10) is arranged in the guide groove (81); when the worm wheel body (8) drives the screw (9) to move axially relative to the guide groove (81), the expansion cone (7) on the eccentric seat (6) presses and contacts the product in the clamping device (4).
3. The precise positioning automatic pipe expanding machine according to claim 2, characterized in that: An outer sleeve (2) and a worm gear box (3) are respectively provided on both sides of the screw rod (9); a first limit switch (18) which is in electrical communication with the outer sleeve (2) is provided on the outer sleeve (2); and a second limit switch (19) which is in electrical communication with the worm gear box (3) is provided on the worm gear box (3); the screw rod (9) and the transmission shaft (10) are both metal parts; when the transmission shaft (10) and the displacement bearing (17) are in contact, the first limit switch (18) is in electrical communication and sends an electrical signal to the motor (14); when the screw rod (9) contacts the second limit switch (19), the second limit switch (19) sends an electrical signal to the motor (14).
4. The precise positioning automatic pipe expanding machine according to claim 1, characterized in that: The worm wheel body (8) is arranged between the outer shaft sleeve (2) and the worm gear box (3), and the outer shaft sleeve (2) and the worm gear box (3) surround a limiting cavity (20) for limiting the axial movement of the worm wheel body (8); the screw rod (9) and the eccentric seat (6) rotate synchronously, and the two are coaxially arranged; the outer layer of the screw rod (9) is provided with a nut (11), and the nut (11) is slidably connected to the worm gear box (3), and the two are coaxially arranged; the outer layer of the nut (11) is sleeved with an elastic body (12), and the elastic body (12) is arranged between the nut (11) and the worm gear box (3).
5. The precise positioning automatic pipe expanding machine according to claim 4, characterized in that: The end of the nut (11) is provided with an annular protrusion (111), one end of the elastic body (12) abuts against the annular protrusion (111), and the other end abuts against the inner wall of the worm gear box (3); the outer layer of the nut (11) is provided with a plurality of annularly distributed limiting protrusions (112), the worm gear box (3) is provided with a plurality of annularly distributed limiting grooves (31), the limiting protrusions (112) are arranged in the limiting grooves (31), and the outer contours of the two are matched with each other; the end of the nut (11) is provided with a retaining spring (21) for limiting its axial travel, and the retaining spring (21) is arranged on the outer side of the worm gear box (3).
6. The precise positioning automatic pipe expanding machine according to claim 4, characterized in that: A positioning pin (22) is provided between the screw rod (9) and the eccentric seat (6) for fixing the two, and a mounting groove (61) is provided in the eccentric seat (6) for mounting the positioning pin (22); the positioning pin (22) passes through the screw rod (9) and extends into the mounting groove (61), and an insulating member (23) is provided between the positioning pin (22) and the inner wall of the mounting groove (61); the eccentric seat (6) is a nylon member, and the screw rod (9) is a metal member; a transmission member tightly connected to the screw rod (9) is installed on the screw rod (9). A driving shaft (10), a guide groove (81) is provided in the worm wheel body (8), and the end of the transmission shaft (10) is arranged in the guide groove (81); the guide grooves (81) are arranged in pairs, and the guide grooves (81) extend along the axial direction of the eccentric seat (6); the screw rod (9) and the eccentric seat (6) are tightly fitted and connected, and a separation protrusion (62) is provided on the eccentric seat (6), and the separation protrusion (62) is arranged between the outer wall of the screw rod (9) and the outer wall of the support sleeve (16).
7. The precise positioning automatic pipe expanding machine according to claim 4, characterized in that: The eccentric seat (6) and the screw rod (9) are integrally formed, the screw rod (9) is a metal part, and the eccentric seat (6) is a nylon part; a transmission shaft (10) is provided between the eccentric seat (6) and the screw rod (9) and passes through the two, a guide groove (81) for mounting the transmission shaft (10) is provided on the worm wheel body (8), and the end of the transmission shaft (10) is arranged in the guide groove (81); the transmission shaft (10) is a metal part, and a gap is provided between the transmission shaft (10) and the support sleeve (16).
8. The precise positioning automatic pipe expanding machine according to claim 1, characterized in that: The outer sleeve (2) and the clamping device (4) are detachably connected; a positioning protrusion (201) is provided on the outer sleeve (2); the clamping device (4) comprises a positioning groove (24) that cooperates with the positioning protrusion (201); when the clamping device (4) is mounted on the outer sleeve (2), the positioning protrusion (201) is stuck in the positioning groove (24); a locking device (5) is provided in the clamping device (4); the locking device (5) is arranged between the positioning groove (24) and the positioning protrusion (201).
9. The precise positioning automatic pipe expanding machine according to claim 8, characterized in that: The locking device (5) comprises a mounting sleeve (51), a first spring (52) and a limiting bead (53); the clamping device (4) comprises a first clamping member (41), the mounting sleeve (51) being fixedly mounted in the first clamping member (41), and the mounting sleeve (51) being provided with a first spring (52) and a limiting bead (53); one end of the first spring (52) abuts against the mounting sleeve (51), and the other end abuts against the limiting bead (53); the outer diameter of the limiting bead (53) matches the inner diameter of the mounting sleeve (51), and the limiting bead (53) can move relative to the mounting sleeve (51); the diameter of the opening end of the mounting sleeve (51) is smaller than the outer diameter of the limiting bead (53); the positioning protrusion (201) is provided with a placement notch (202) for placing the limiting bead (53), and the outer contour of the placement notch (202) matches the outer contour of the limiting bead (53).
10. The precise positioning automatic pipe expanding machine according to claim 8, characterized in that: The clamping device (4) comprises a first clamping member (41), a second clamping member (42), a switch handle (43), a blocking member (44) and a resetting elastic member (45); a first pin shaft (46) is provided between the first clamping member (41) and the second clamping member (42) for hingedly connecting the two, and a second pin shaft (47) is provided between the first clamping member (41) and the switch handle (43) for hingedly connecting the two; a connecting rod (48) is provided between the switch handle (43) and the second clamping member (42) for connecting the two, and the connecting rods (48) are arranged in pairs; one end of the connecting rod (48) is hingedly connected to the switch handle (43), and the other end of the connecting rod (48) is hingedly connected to the first clamping member (41) and the switch handle (43). two clamping members (42); when the first clamping member (41) and the second clamping member (42) are in contact with each other, a tube expansion cavity (13) for placing a product is formed, and the tube expansion cavity (13) and the eccentric seat (6) are coaxially arranged; a positioning member (49) is also arranged between the first clamping member (41) and the second clamping member (42), one end of the positioning member (49) is fixedly installed in the second clamping member (42), and the other end of the positioning member (49) extends into the first clamping member (41); a blocking member (44) rotatably connected to the first pin shaft (46) is provided, and a reset elastic member (45) is provided between the blocking member (44) and the second clamping member (42).