Ring pressing die and pipe crimping tool

Abstract

The present invention belongs to the technical field of pipeline connection tools, and particularly refers to a ring pressing die and a pipe crimping tool, which includes a hydraulic mechanism, a conversion head and a ring pressing die. The hydraulic mechanism drives the ring pressing die to work through the conversion head and realizes pipe crimping; the ring pressing die includes a fixed die set and a plurality of movable die sets. At least one movable die set is rotatably arranged on the upper and lower sides of the fixed die set, and the movable die sets are connected end to end. The tail ends of the movable die sets on both sides are respectively provided with crimping columns, and the crimping columns correspond to the clamping part of the connection conversion head. The present invention realizes one-time crimping of large pipes through the linkage work of the hydraulic mechanism, the conversion head and the ring pressing die, and has the advantages of convenient operation, high crimping efficiency and long service life.

Description

[0001] This application is a divisional application of patent number 202011120460X, invention name: A ring pressing die and pipe crimping tool. Technical Field

[0002] The invention belongs to the technical field of pipeline connection tools, in particular to a ring pressing die and a pipeline crimping tool. Background Art

[0003] The pipe crimping tool is a tool that connects two pipes together by crimping. Its main structure is a ring pressing die. Each pipe crimping tool is only for a certain standard pipe diameter.

[0004] The invention patent with the patent number of 201310524363.0 discloses a ring pressing die for crimping pipe fittings, which includes a fixed die in the shape of an arc and two movable dies in the shape of an arc. The inner ends of the two movable dies are respectively hinged at the two ends of the fixed die. The outer ends of the two movable dies can be buckled together and when they are buckled, the inner sides of the fixed die and the movable die form a ring-shaped clamping ring for clamping the outer side of the pipe fitting. The clamping ring has a number of uniformly distributed clamping parts. When the mold is buckled, the above-mentioned clamping parts and the pipe fitting can be transformed from line contact or partial surface contact to the clamping parts being completely pressed on the outer side of the pipe fitting. When crimping the pipe fitting, the contact between the clamping parts and the pipe fitting can be transformed from line contact or partial surface contact to the clamping parts being completely pressed on the outer side of the pipe fitting. Therefore, at the beginning of crimping, the pressure of the clamping parts on the pipe fitting is relatively large, and finally it is completely pressed against the outer side of the pipe fitting, so that the crimping effect of the pipe fitting is better.

[0005] The above technical solution has the following defects:

[0006] 1. In the above structure, the mold body of the movable mold is assembled by three plates through hinged columns, and a guide groove is formed between two plates. Due to the relatively large crimping force, the plates are easily deformed after long-term use, resulting in a decrease in crimping accuracy.

[0007] 2. It is difficult to achieve the same precision in the hole sizes of the three plates, so there will be uneven force, causing one of the plates to break first.

[0008] 3. The assembly structure of the movable mold body is relatively complex and the assembly efficiency is low.

[0009] 4. For large pipes (diameter 60-108mm), it is generally chosen to increase the number of movable molds. The more movable molds there are, the worse the controllability will be. During use, the movable mold will swing, resulting in irregular holes inside, making it difficult for pipes to enter. The bending angle of individual movable molds may be too large or too small, resulting in crimping deformation, making it impossible to achieve one-time crimping in large pipes such as drainage, fire protection, and gas supply. Summary of the invention

[0010] The purpose of the present invention is to provide a ring pressing die and a pipe crimping tool with simple structure, convenient operation and reliable crimping, which are mainly used for connecting large pipes with a diameter of more than 60 mm.

[0011] The object of the present invention is achieved in that:

[0012] A ring pressing die comprises a fixed die set and a plurality of movable die sets.

[0013] At least one movable die set is rotatably arranged on the upper and lower sides of the fixed die set, the movable die sets are connected end to end, and clamping columns are arranged at the tail ends of the movable die sets on both sides; wherein the fixed die set includes a fixed die seat and a fixed die pressing flap, and each movable die set includes a movable die seat and a movable die pressing flap;

[0014] The movable die seat is rotatably arranged at one end of the fixed die seat or another movable die seat through a hinge pin;

[0015] An arc-shaped guide groove is provided on the inner side of the movable mold seat, an arc-shaped guide strip is extended from the outer side wall of the movable mold pressing petal, and the movable mold pressing petal is arranged on the movable mold seat through the cooperation of the arc-shaped guide groove and the arc-shaped guide strip;

[0016] A radial compensation device is provided between the movable die seat and the movable die pressing petal, and the radial compensation device comprises a spring limiting portion A provided in the arc-shaped guide groove, a spring limiting portion B provided on the arc-shaped guide strip, and a return spring provided therebetween;

[0017] All the movable die pressing petals and the fixed die pressing petals together form an annular crimping structure for clamping and crimping pipes.

[0018] Preferably, a limiting protrusion is extended on the end wall of the arc-shaped guide groove, and a limiting groove matched with the limiting protrusion is opened on the side wall of the arc-shaped guide strip. The limiting protrusion cooperates with the limiting groove to realize the positioning installation of the movable mold seat and the movable mold pressing petal.

[0019] Preferably, a pressure flap limiting portion is provided at one end of the arc-shaped guide groove away from the spring limiting portion A, and the pressure flap limiting portion is provided at the end of the movable mold pressure flap to prevent it from escaping from the arc-shaped guide groove.

[0020] Preferably, a movable die group crimping limit mechanism is provided at the hinge between the fixed die seat and the movable die seat, or / and at the hinge between the movable die seat and another movable die seat, and the movable die group crimping limit mechanism includes a limit pin provided on one of the components and a limit buckle provided on the other component, and when the annular crimping structure is in an extreme pressing state, the limit buckle abuts against the limit pin.

[0021] Preferably, an auxiliary mold closing structure is provided at the hinge between the fixed mold base and the movable mold base, or / and at the hinge between the movable mold base and another movable mold base, the auxiliary mold closing structure includes a push rod mounting hole opened at the end of one of the components, a push rod spring and a push rod are provided in the push rod mounting hole, and the push rod abuts against the other component hinged thereto.

[0022] Preferably, the arc-shaped guide grooves of two adjacent movable mold seats are respectively arranged on different circular cross-sections, and the corresponding arc-shaped guide strips are arranged correspondingly thereto.

[0023] Preferably, the ring pressing die comprises a fixed die set and four movable die sets, and two movable die sets are rotatably provided on the upper and lower sides of the fixed die set respectively through hinge pins.

[0024] A pipe crimping tool comprises a hydraulic mechanism, a conversion head and the ring pressing die, wherein the hydraulic mechanism drives the ring pressing die to work through the conversion head and realizes pipe crimping;

[0025] The hydraulic mechanism comprises a clamp head, a cylinder body and a hydraulic driving structure. The rear end of the cylinder body is provided with a hydraulic driving structure. The front end of the cylinder body is provided with a clamp head for installing a conversion head. A piston cavity is formed between the two. A piston assembly is provided in the piston cavity. The piston rod of the piston assembly extends out of the piston cavity. Under the action of the hydraulic driving structure, the piston rod drives the conversion head to work.

[0026] The conversion head comprises a push guide portion for abutting against the outer end of the piston rod and a clamping portion for clamping the ring pressing die, and the push guide portion drives the clamping portion to achieve clamping.

[0027] Preferably, the conversion head further comprises left and right connecting plates, an upper clamp arm and a lower clamp arm are respectively arranged between the left and right connecting plates through a rotating pin, and a steel ball is also arranged at the abutment of the upper clamp arm and the lower clamp arm;

[0028] The rear parts of the upper clamp arm and the lower clamp arm respectively form a guide push part; the front ends of the upper clamp arm and the lower clamp arm respectively form a clamping part;

[0029] The rear ends of the left and right connecting plates are mounted on the clamp head through the clamp head pins;

[0030] At least one conversion head spring is arranged between the upper clamp arm and the lower clamp arm, and a mounting handle is arranged on the rear end outer side wall of the upper clamp arm and / or the lower clamp arm.

[0031] Preferably, a threaded hole is provided at the rear end of the pliers head, and an external threaded portion and a limiting ring groove are provided in sequence at the front end of the cylinder body. The pliers head is threadedly connected to the front end of the cylinder body, and a rotation limiting pin is fixed in the threaded hole. The rotation limiting pin is arranged in the limiting ring groove, and the diameter of the rotation limiting pin is smaller than the width of the limiting ring groove.

[0032] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0033] 1. The present invention realizes one-time crimping of large pipes through the linkage work of hydraulic mechanism, conversion head and ring pressing die, and has the advantages of convenient operation, high crimping efficiency and long service life.

[0034] 2. The ring pressing die of the present invention is composed of a fixed die group and several movable die groups. The fixed die seat is integrated. Compared with the original splicing structure of three plates, it is convenient to install, not easy to deform, has higher precision, and has stronger pressure bearing capacity, which is suitable for the crimping of large pipes. Among them, the matching mode of the arc guide groove and the arc guide strip facilitates the installation of the movable die seat and the movable die flap; the radial compensation device can improve the pressure bearing pressure, tensile strength and torsion resistance of the pipeline; the movable die crimping limit structure can prevent the movable die flap from having inconsistent stroke due to uneven force during crimping, resulting in the pipe fitting being pressed into anisotropy, reducing the sealing and pressure bearing pressure: the ring die auxiliary clamping structure can prevent the mold from falling off the pipe fitting before pressing, which is convenient for operation.

[0035] 3. The present invention makes opening the clamping part more labor-saving by pressing the installation handle, which facilitates the installation of the ring pressing mold and the transportation of the conversion head.

[0036] 4. The clamp head of the present invention can be rotated. When encountering a corner or other complex installation environment, the clamp head can be rotated to adjust the position of the ring pressing mold, which is convenient for operation. The limit ring groove and the rotation limit pin are used to limit the rotation of the clamp head to prevent the clamp head from separating from the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the pipeline crimping tool of the present invention.

[0038] Figure 2 It is the front view of the ring pressing mold of the present invention.

[0039] Figure 3 yes Figure 2 Cross-sectional view of the annular crimping structure at AA in the middle.

[0040] Figure 4 yes Figure 3 Cross-sectional view of the left circular section of the ring pressing die at the middle BB.

[0041] Figure 5 yes Figure 3 Cross-sectional view of the circular section in the ring pressing die at CC.

[0042] Figure 6 yes Figure 3 Cross-sectional view of the right circular section of the ring pressing die at DD in the middle.

[0043] Figure 7yes Figure 2 Cross-sectional view of the cooperation between the movable mold seat and the movable mold flap at EE in the middle.

[0044] Figure 8 It is a stereogram of the ring pressing die of the present invention.

[0045] Fig. 9 It is a stereoscopic diagram of the fixed mold flap and the movable mold flap of the present invention.

[0046] Fig.10 It is a side view of the fixed mold flap and the movable mold flap of the present invention.

[0047] Fig.11 It is a three-dimensional diagram of the movable mold base of the present invention.

[0048] Fig.12 It is an exploded view of the ring pressing die of the present invention.

[0049] Fig.13 It is an exploded view of the movable mold base and the movable mold pressing petal of the present invention.

[0050] Fig.14 It is a structural schematic diagram of installing a clamping plate on the ring pressing die of the present invention.

[0051] Fig.15 It is a cross-sectional view of a clamping plate installed on the ring pressing die of the present invention.

[0052] Fig.16 It is a front view of the conversion head of the present invention.

[0053] Fig.17 It is a bottom view of the conversion head of the present invention.

[0054] Fig.18 It is one of the cross-sectional views of the hydraulic mechanism of the present invention.

[0055] Fig.19 yes Fig.18 Cross-sectional view of the plunger assembly at FF.

[0056] Fig. 20 yes Fig.18 Cross-sectional view of the rotation limit structure at GG in the middle.

[0057] Fig.21 This is the second sectional view of the hydraulic mechanism of the present invention.

[0058] Fig. 22 yes Fig.21 Cross-sectional view of the pressure relief device at H in the middle.

[0059] The meaning of the symbols in the figure:

[0060] 1-Hydraulic mechanism; 2-Conversion head; 3-Ring pressing die;

[0061] 11-clamp head; 111-rotation limit pin; 112-clamp head pin; 113-sheath;

[0062] 12-cylinder body; 121-inlet valve; 122-outlet valve; 124-limiting ring groove;

[0063] 13-Oil bag;

[0064] 14-piston assembly; 141-piston rod; 142-roller; 143-piston spring; 144-limiting retaining ring; 145-piston;

[0065] 15- plunger assembly; 151- plunger; 152- cylinder sleeve; 153- plunger spring; 154- spring column; 155- low-pressure piston;

[0066] 16- plunger drive device;

[0067] 17-pressure relief device; 171-pressure relief valve seat; 172-pressure relief valve needle; 173-pressure relief piston; 174-pressure relief spring; 175-pressure relief spring seat;

[0068] 18-Handheld housing;

[0069] 21-upper clamp arm; 211-push guide; 212-clamping part; 22-lower clamp arm; 23-left and right connecting plates; 24-rotation pin; 25-steel ball; 26-conversion head spring; 27-installation handle;

[0070] 31-fixed die set; 311-fixed die seat; 312-fixed die flap; 313-cage plate;

[0071] 32-movable die set; 321-movable die seat; 322-movable die pressure flap; 323-arc guide groove; 324-arc guide strip; 325-limiting protrusion; 326-limiting groove; 327-pressure flap limiting part;

[0072] 33- hinge pin; 34- clamping column;

[0073] 35- radial compensation device; 351- spring limiter A; 352- spring limiter B; 353- return spring;

[0074] 36-moving die set crimping limit mechanism; 361-limit pin; 362-limit buckle;

[0075] 37- auxiliary mold clamping structure; 371- ejector spring; 372- ejector. DETAILED DESCRIPTION

[0076] The present invention will be further described below in conjunction with specific embodiments:

[0077] like Figure 1As shown, a pipe crimping tool comprises a hydraulic mechanism 1, a conversion head 2 and a ring pressing die 3. The hydraulic mechanism 1 drives the ring pressing die 3 to work through the conversion head 2 and realizes pipe crimping.

[0078]

Hydraulic mechanism

[0079] like Fig.18 , 21 As shown, the hydraulic mechanism 1 includes a clamp head 11, a cylinder body 12 and a hydraulic drive structure. The front end of the cylinder body 12 is equipped with a clamp head 11 for installing a conversion head 2, and a piston cavity is formed between the clamp head 11 and the cylinder body 12. A piston assembly 14 is arranged in the piston cavity. The piston assembly 14 includes a piston rod 141, a piston spring 143, a limit ring 144 and a piston 145. The limit ring 144 is arranged at the connection between the clamp head 11 and the cylinder body 12 and is used for piston limiting. The piston 145 is installed at the inner end of the piston rod 141, and the piston spring 143 is sleeved on the outside of the piston rod 141 and abuts between the limit ring 144 and the piston 145 to achieve the reset of the piston rod 141. The outer end of the piston rod 141 passes through the limit ring 144 and the end face of the clamp head 11 in sequence and then extends out of the piston cavity, and a pair of rollers 142 for driving the conversion head 2 to work are arranged at its outer end.

[0080] The rear end of the clamp head 11 is provided with a threaded hole, and the front end of the cylinder body 12 is provided with an external threaded portion and a limiting ring groove 124 in sequence. The clamp head 11 is threadedly connected to the front end of the cylinder body 12, wherein one end of the limiting retaining ring 144 is installed at the bottom of the threaded hole and the other end is installed on the inner wall of the cylinder body 12. Fig. 20 As shown, a rotation limit pin 111 is fixed in the threaded hole by a screw, and the rotation limit pin 111 is arranged in the limit ring groove 124, and the diameter of the rotation limit pin 111 is smaller than the width of the limit ring groove 124. Due to the limitation of the limit ring groove 124 and the rotation limit pin 111, the pliers head 11 can be allowed to rotate a certain angle, and the range of the rotation angle is 0-310 degrees. When encountering a corner or other complex installation environment, the pliers head 11 can be rotated to adjust the position of the ring pressing mold, which is convenient for operation.

[0081] The hydraulic drive structure is as follows: Fig.19As shown, a plunger cavity is provided in the middle of the cylinder body 12, and a plunger assembly 15 is movably provided in the plunger cavity. The plunger assembly 15 includes a plunger 151, a cylinder sleeve 152, a plunger spring 153, a spring column 154, and a low-pressure piston 155. The cylinder sleeve 152 is threadedly connected to the outer end of the plunger cavity through a first sealing ring. The plunger 151 is penetrated in the middle of the cylinder sleeve 152 and extends into the plunger cavity, and a second sealing ring is provided between the two. The plunger spring 153, the spring column 154, and the low-pressure piston 155 are sequentially provided in the plunger cavity. A through hole for oil outlet is provided in the middle of the low-pressure piston 155, and the low-pressure piston 155 abuts against the inner end of the plunger 151.

[0082] The outer end of the plunger 151 is provided with a plunger driving device 16. The plunger driving device 16 is generally divided into a manual plunger driving device and an electric plunger driving device. The manual plunger driving device includes a manual push rod hinged on the cylinder body 12. The middle part of the manual push rod is hinged to the plunger 151. The reciprocating motion of the plunger 151 is achieved by pressing the manual push rod back and forth.

[0083] The electric plunger drive device includes a motor, a reducer and an eccentric wheel structure, and the motor realizes the reciprocating motion of the plunger 151 through the reducer and the eccentric wheel structure. This embodiment is preferably an electric plunger drive device, which also requires a battery or a power cord connected to the mains to provide power, and is controlled by a circuit board and a power switch.

[0084] An oil bag 13 is installed at the rear end of the cylinder body 12, an oil inlet channel and an oil inlet valve 121 are provided between the oil bag 13 and the plunger cavity, and an oil inlet filter is provided at the front end of the oil inlet valve 121. An oil outlet channel and an oil outlet valve 122 are provided between the plunger cavity and the piston cavity, and the specific structures of the oil inlet valve 121 and the oil outlet valve 122 have been disclosed in the utility model "A one-way valve for hydraulic tools" with patent number 201821913263.1, and will not be repeated here.

[0085] Working principle of the hydraulic mechanism: the plunger drive device 16 drives the plunger 151 to reciprocate, so that the oil inlet valve 121 sucks oil from the oil bag and the oil outlet valve 122 discharges oil to the piston chamber, thereby pushing the piston rod to move outward.

[0086] The hydraulic mechanism has the characteristics of fast oil output and high power.

[0087] like Fig. 22As shown, a pressure relief passage and a pressure relief chamber are provided between the piston chamber and the oil bag 13, and a pressure relief device 17 is provided in the pressure relief chamber. The pressure relief device 17 includes a pressure relief valve seat 171, a pressure relief valve needle 172, a pressure relief piston 173, a pressure relief spring 174 and a pressure relief spring seat 175. The pressure relief valve seat 171 is provided with a first pressure relief hole in the middle and is installed on the pressure relief passage at the bottom of the pressure relief chamber. The pressure relief valve needle 172 is provided with a pressure relief piston 173, a pressure relief spring 174 and a pressure relief spring seat 175 in sequence, and is installed in the pressure relief chamber. Under the action of the pressure relief spring 174, the pressure relief valve needle 172 abuts against the first pressure relief hole. A second pressure relief hole connected to the oil bag is provided on the side wall of the pressure relief chamber. Under the action of the pressure relief spring 174, the pressure relief piston 173 is provided in the pressure relief chamber between the first pressure relief hole and the second pressure relief hole. The outer end of the pressure relief valve needle 172 is connected to a pressure relief switch. When the tool completes crimping, the pressure relief switch is turned, and the pressure relief valve needle 172 leaves the first pressure relief hole and connects to the second pressure relief hole, so that the high-pressure hydraulic oil in the piston cavity can automatically flow into the oil bag to achieve oil return pressure relief.

[0088] For convenient holding, a handheld housing 18 enclosing a motor, an oil bag, a circuit board and other structures is provided at the rear end of the cylinder body 12 , and a power switch and a pressure relief switch are provided on the handheld housing 18 .

[0089] In addition, a sheath 113 is provided in the middle of the pliers head 11 to prevent the hand from getting stuck. A lifting ring is provided in the middle of the cylinder body 12 to facilitate transportation.

[0090]

Converter

[0091] like Figure 16-17 As shown, the conversion head 2 includes an upper clamp arm 21 and a lower clamp arm 22 that can rotate with each other, and left and right connecting plates 23. The upper clamp arm 21 and the lower clamp arm 22 are respectively provided between the left and right connecting plates 23 through a rotating pin 24, and a steel ball 25 is also provided at the abutment between the upper clamp arm 21 and the lower clamp arm 22. The rear ends of the left and right connecting plates 23 are provided with a clamp head pin mounting hole, and are mounted on the clamp head 11 through a clamp head pin 112. The rotating pin 24 and the clamp head pin 112 are both cylindrical pins, and their two ends are fixed by a retaining spring after installation.

[0092] The inner sides of the rear parts of the upper clamp arm 21 and the lower clamp arm 22 respectively form a curved guide part 211 and abut against the roller 142 at the outer end of the piston rod 141; the inner sides of the front ends of the upper clamp arm 21 and the lower clamp arm 22 respectively form a clamping part 212, which is an arc-shaped hook and is used to clamp the ring pressing mold 3. In order to match the clamping position of the ring pressing mold 3, two clamping parts 212 are arranged side by side on each side. When the piston rod moves outward, the roller 142 acts on the guide part 211 and drives it to open, thereby achieving the clamping of the clamping part 212.

[0093] In order to achieve better installation of the ring pressing mold 3, at least one conversion head spring 26 is arranged between the upper clamp arm 21 and the lower clamp arm 22, and two are arranged in this embodiment; a mounting handle 27 is arranged on the rear end outer wall of the upper clamp arm 21 and / or the lower clamp arm 22, specifically, the mounting handle 27 is detachably arranged on the forearm by means of a threaded connection, and is preferably arranged vertically.

[0094] By pressing the installation handle, the opening of the clamping portion 212 is made easier, thereby facilitating the installation of the ring pressing mold.

[0095]

Ring pressing mold

[0096] like Figure 2-13 As shown, the ring pressing die 3 includes a fixed die set 31 and a plurality of movable die sets 32, the number of which can be 2, 4, 6, 8, etc., and at least one movable die set 32 ​​is rotatably provided on the upper and lower sides of the fixed die set 31 through a hinge pin 33, and an annular crimping structure for crimping the pipe is formed. The tail ends of the upper movable die set 32 ​​and the lower movable die set 32 ​​are connected to form a closed mouth, and the tail ends of the movable die sets 32 on both sides are respectively provided with a crimping column 34, and the crimping column 34 corresponds to the clamping portion 212 of the connecting head 2. When the clamping portion 212 is clamped, the force on the annular crimping structure is reduced, and the crimping of the pipe is achieved.

[0097] Specifically, the fixed die set 31 includes a fixed die seat 311 and a fixed die pressing flap 312, which are preferably integrally formed in this embodiment. Each movable die set 32 ​​includes a movable die seat 321 and a movable die pressing flap 322, and the movable die seat 321 is rotatably arranged at one end of the fixed die seat 311 or another movable die seat 321 through a hinge pin 33. The clamping column 34 and the hinge pin 33 are both cylindrical pins, and the two ends are fixedly installed by a clamping spring.

[0098] like Figure 4 As shown, an arc-shaped guide groove 323 is provided on the inner side of the movable mold seat 321, and an arc-shaped guide strip 324 is extended from the outer side wall of the movable mold pressing flap 322. The movable mold pressing flap 322 is arranged on the movable mold seat 321 through the coordinated movement of the arc-shaped guide groove 323 and the arc-shaped guide strip 324. The inner walls of all movable mold pressing flaps 322 and fixed mold pressing flaps 312 are formed with arc-shaped crimping grooves for clamping and crimping pipes, and together form the annular crimping structure.

[0099] In the mold closing state, the centers of the circles where the radius of the arc-shaped crimping groove is located are all at the same point or the same straight line, and a regular annular crimping groove is formed for crimping of circular pipes. In order to increase the pulling resistance, torsion resistance and bending resistance, the centers of the circles where the radius is located on the inner surfaces of the movable mold crimping petal 322 and the fixed mold crimping petal 312, that is, on the edges of both sides of the arc-shaped crimping groove, are not at the same point or the same straight line, and an irregular edge sealing ring is formed.

[0100] like Figure 5 As shown, a radial compensation device 35 is provided between each movable mold seat 321 and the movable mold pressing petal 322, and the radial compensation device 35 includes a spring limiting portion A351 provided in the arc guide groove 323, a spring limiting portion B352 provided on the arc guide strip 324, and a reset spring 353 provided therebetween. The spring limiting portion A351 and the spring limiting portion B352 are preferably limiting rods, and the two are vertically arranged, that is, the spring limiting portion A351 is arranged in the axial direction of the annular crimping structure, and the spring limiting portion B352 is arranged in the radial direction of the annular crimping structure. In order to facilitate the installation of the reset spring 353, an arc groove is provided on the outer side wall of the arc guide strip 324, and the spring limiting portion B352 is inserted at one end of the arc groove.

[0101] When the mold is closed, the radial compensation device 35 can fine-tune the circumferential position of the movable mold flap 322 to perform automatic radial compensation, thereby improving the pressure bearing, tensile strength and torsional resistance of the pipeline.

[0102] like Figure 6 As shown, a pressure flap limiting portion 327 is provided at one end of the arc-shaped guide groove 323 away from the spring limiting portion A351. The pressure flap limiting portion 327 is provided at the end of the movable mold pressure flap 322 to prevent it from escaping from the arc-shaped guide groove 323.

[0103] like Figure 7 , 13 As shown, a limiting protrusion 325 is extended on the end wall of the arc-shaped guide groove 323, and a limiting groove 326 adapted to the limiting protrusion 325 is opened on the side wall of the arc-shaped guide strip 324. The limiting protrusion 325 cooperates with the limiting groove 326 to realize the positioning and installation of the movable mold seat 321 and the movable mold pressing petal 322.

[0104] like Figure 5As shown, a movable die group crimping limit mechanism 36 is provided at the hinge of the fixed die seat 311 and the movable die seat 321, or / and, at the hinge of the movable die seat 321 and another movable die seat 321. The movable die group crimping limit mechanism 36 includes a limit pin 361 provided on one of the components and a limit buckle 362 provided on the other component. When the annular crimping structure is in an extreme pressing state after the mold is closed, the limit buckle 362 abuts against the limit pin 361, and can prevent the movable die from having inconsistent stroke due to uneven force during crimping, resulting in the pipe fitting being pressed into an anisotropic shape, thereby reducing the sealing and pressure bearing pressure.

[0105] like Figure 4 As shown, an auxiliary mold closing structure 37 is provided at the hinge between the fixed mold base 311 and the movable mold base 321, or / and, at the hinge between the movable mold base 321 and another movable mold base 321. The auxiliary mold closing structure 37 includes a push rod mounting hole opened at the end of one of the components, and a push rod spring 371 and a push rod 372 are provided in the push rod mounting hole. The push rod 372 abuts against the other component hinged thereto.

[0106] like Figure 8 As shown, in this embodiment, the ring pressing die 3 includes a fixed die set 31 and four movable die sets 32. The upper and lower sides of the fixed die set 31 are respectively provided with two movable die sets 32 rotatably through hinge pins 33, and the two movable die sets 32 are also hinged to each other through hinge pins 33. Specifically, three-claw plates are provided at both ends of the fixed die seat, two-claw plates are provided at both ends of the movable die seat connected to the fixed die seat, and three-claw plates are provided at both ends of the movable die seat away from the fixed die seat. The corresponding three-claw plates and two-claw plates are connected by hinge pins 33 after being inserted in sequence.

[0107] In addition, the limiting pin is arranged on the two-claw plate, and the limiting buckle is arranged on the middle claw of the three-claw plate.

[0108] like Figure 9-11 As shown, the arc-shaped guide grooves 323 of two adjacent movable mold seats 321 are respectively arranged on different circular cross-sections, and the corresponding arc-shaped guide strips 324 are arranged correspondingly thereto, that is, the arc-shaped guide strips 324 are arranged in a staggered manner. Specifically, the circular cross-section is divided into three parts: left, middle, and right. In this embodiment, three consecutive adjacent arc-shaped guide grooves 323 are all opened on three different circular cross-sections. This is conducive to increasing the strength of the ring pressing mold.

[0109] like Figure 14-15 As shown, a clamping plate 313 can be provided on one side of the fixed die set 31 as required, and the clamping plate 313 is fixed to one end of the hinge pin through a corrugated elastic washer and a clamping plate retaining ring, and an arc-shaped clamping groove is provided in the middle of the clamping plate 313, and the arc-shaped clamping groove is provided on the end surface of the annular crimping structure, and plays a foolproof role to prevent the fixed die set and the movable die set from being reversed. At the same time, the arc-shaped clamping groove is opposite to the crimping direction of the pipe fitting.

[0110] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A ring pressing die, comprising a fixed die set (31) and a plurality of movable die sets (32), At least one movable die set (32) is rotatably disposed on the upper and lower sides of the fixed die set (31), and two adjacent movable die sets (32) on the same side are hinged in sequence; and clamping columns (34) are respectively disposed at the tail ends of the two movable die sets (32) adjacent to the tail. in, The fixed die assembly (31) comprises a fixed die seat (311) and a fixed die pressure flap (312). The movable die assembly (32) comprises a movable die seat (321) and a movable die pressing flap (322); an arc-shaped guide groove (323) is provided on the inner side of the movable die seat (321), and the movable die pressing flap (322) is slidably mounted in the corresponding arc-shaped guide groove (323); The ring pressing die can be opened or closed at the tail of the movable die assembly (32); when in the closed state, the fixed die pressing flap (312) and the movable die pressing flap (322) form a circular ring; It is characterized by: An auxiliary mold clamping structure (37) is provided at the hinge of the connected fixed mold base (311) and the movable mold base (321), or / and at the hinge of the two connected movable mold bases (321); The auxiliary mold closing structure (37) comprises a push rod mounting hole opened at the end of one of the components, and a push rod spring (371) and a push rod (372) are arranged in the push rod mounting hole; the push rod (372) abuts against another component hinged thereto, so that the ring pressing mold maintains a closing movement trend; A movable die set crimping limit mechanism (36) is provided at the hinge of the connected fixed die seat (311) and movable die seat (321), or / and at the hinge of the two connected movable die seats (321). The movable die set crimping limit mechanism (36) comprises a limit pin (361) provided on one of the components and a limit buckle (362) provided on the other component. When the annular crimping structure is in a set extreme pressing position, the limit buckle (362) abuts against the limit pin (361).

2. A ring pressing die according to claim 1, characterized in that The outer side wall of the movable mold pressing flap (322) is extended with an arc-shaped guide strip (324), and the movable mold pressing flap (322) is arranged on the movable mold seat (321) through the cooperation of the arc-shaped guide groove (323) and the arc-shaped guide strip (324); A radial compensation device (35) is arranged between the movable mold seat (321) and the movable mold pressing petal (322), and the radial compensation device (35) comprises a spring limiting portion A (351) arranged in the arc-shaped guide groove (323), a spring limiting portion B (352) arranged on the arc-shaped guide strip (324), and a return spring (353) arranged therebetween.

3. A ring pressing die according to claim 2, characterized in that A pressure flap limiting portion (327) is provided at one end of the arc-shaped guide groove (323) away from the spring limiting portion A (351). The pressure flap limiting portion (327) is provided at the end of the movable mold pressure flap (322) to prevent it from escaping from the arc-shaped guide groove (323).

4. A ring pressing die according to claim 2, characterized in that A limiting protrusion (325) is extended on the end wall of the arc-shaped guide groove (323), and a limiting groove (326) adapted to the limiting protrusion (325) is opened on the side wall of the arc-shaped guide strip (324). The limiting protrusion (325) cooperates with the limiting groove (326) to realize the positioning and installation of the movable mold seat (321) and the movable mold pressing petal (322).

5. A ring pressing die according to any one of claims 1 to 4, characterized in that The arc-shaped guide grooves (323) of two adjacent movable mold seats (321) are respectively arranged on different circular cross-sections, and the corresponding arc-shaped guide strips (324) are arranged correspondingly thereto.

6. A ring pressing die according to any one of claims 1 to 4, characterized in that The ring pressing die (3) comprises a fixed die set (31) and four movable die sets (32), and two movable die sets (32) are rotatably provided on the upper and lower sides of the fixed die set (31) respectively through hinge pins (33).

7. A pipe crimping tool, characterized in that , comprising a hydraulic mechanism (1), a conversion head (2) and a ring pressing die as described in any one of claims 1 to 6, wherein the hydraulic mechanism (1) drives the ring pressing die (3) to work through the conversion head (2) and realizes pipe clamping; The hydraulic mechanism (1) comprises a clamp head (11), a cylinder body (12) and a hydraulic drive structure, wherein the rear end of the cylinder body (12) is provided with the hydraulic drive structure, the front end of the cylinder body (12) is provided with a clamp head (11) for installing a conversion head (2), and a piston cavity is formed between the two, a piston assembly (14) is provided in the piston cavity, a piston rod (141) of the piston assembly (14) extends out of the piston cavity, and under the action of the hydraulic drive structure, the piston rod (141) drives the conversion head (2) to work; The conversion head (2) comprises a push guide portion (211) for abutting against the outer end of the piston rod (141) and a clamping portion (212) for clamping the ring pressing mold (3), and the push guide portion (211) drives the clamping portion (212) to achieve clamping.

8. A pipe crimping tool according to claim 7, characterized in that The conversion head (2) further comprises left and right connecting plates (23), and an upper clamp arm (21) and a lower clamp arm (22) are respectively arranged between the left and right connecting plates (23) via a rotating pin (24). A steel ball (25) is also provided at the abutment point between the upper clamp arm (21) and the lower clamp arm (22); The rear parts of the upper clamp arm (21) and the lower clamp arm (22) respectively form a guide push portion (211); the front ends of the upper clamp arm (21) and the lower clamp arm (22) respectively form a clamping portion (212); The rear ends of the left and right connecting plates (23) are mounted on the clamp head (11) via a clamp head pin (112); At least one conversion head spring (26) is arranged between the upper clamp arm (21) and the lower clamp arm (22), and a mounting handle (27) is arranged on the rear end outer side wall of the upper clamp arm (21) and / or the lower clamp arm (22).

9. A pipe crimping tool according to claim 7, characterized in that The rear end of the pliers head (11) is provided with a threaded hole, and the front end of the cylinder body (12) is provided with an external threaded portion and a limiting ring groove (124) in sequence. The pliers head (11) is threadedly connected to the front end of the cylinder body (12), and a rotation limiting pin (111) is fixed in the threaded hole. The rotation limiting pin (111) is arranged in the limiting ring groove (124), and the diameter of the rotation limiting pin (111) is smaller than the width of the limiting ring groove (124).

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