Roller die stand, pipe jacking machine and method of operating the same

Abstract

The application discloses a roller die frame, a pipe jacking machine and an operating method thereof, and relates to the technical field of steel pipe production. The roller die frame comprises a shell mechanism, the shell mechanism is provided with opposite first and second end faces and a side wall face, the shell mechanism is internally provided with an accommodating cavity, the first end face is provided with a first notch in communication with the accommodating cavity, the second end face is provided with a second notch in communication with the accommodating cavity, and the side wall face is provided with a cavity extending along the radial direction of the shell mechanism in communication with the accommodating cavity; a plurality of adjustable roller die mechanisms are distributed in the circumferential direction of the axis of the shell mechanism, the adjustable roller die mechanism comprises a sliding seat capable of moving in the radial direction and installed in the accommodating cavity, a rolling roller assembly mechanism installed on the sliding seat, a rolling roller installed on the rolling roller assembly mechanism, the rolling roller assembly mechanism enabling the rolling roller to rotate under the driving of a blank pipe, and a roller gap adjusting mechanism installed in the cavity. The application can reasonably and timely adjust the roller gap of the roller die of the pipe jacking machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel pipe production, in particular to a roll die frame, a pipe jacking machine and an operating method thereof. BACKGROUND

[0002] The CPE process is a hot-rolled seamless steel pipe production process, which is developed on the basis of the traditional pipe jacking process, i.e. a combined production process of cross roll piercing and pipe jacking elongation. The working principle of the pipe jacking unit is to drive the jacking rod through the transmission rack, and the jacking core rod with the already completed necking-down pipe passes through multiple passes of rolling to extend the pipe to achieve the purpose of wall reduction and elongation.

[0003] The existing pipe jacking machine generally comprises a bed body, a roll die, a movable buckle, a pipe jacking machine front desk, a main transmission, a rack, a gear seat, a pipe jacking machine back desk, a safety baffle and the like. The function of the bed body is to install the roll die and bear the jacking force along the rolling direction. The installation position of the roll die needs to be set according to the rolling of different specifications of the rolled piece, so the side plates are arranged on both sides of the bed body, and a series of positioning tooth grooves are processed on the side plates. The width of the tooth groove is suitable for the width of the positioning key on the roll die for installing the roll die. The side plate can be processed by forging steel and generally has a rectangular structure. One side is provided with uniformly distributed rectangular tooth grooves, and the other side is provided with a flat surface which is connected with the base. The pipe jacking machine adopts a roll die with three rollers, and is provided with two forms of fixed roll die and adjustable roll die. The adjustable roll die is arranged at the outlet side and serves as the frame for finish rolling. The rollers of the two roll die frames are all non-driven rollers. The fixed roll die is composed of a roller assembly and a roll die frame. The inner cavity of the roll die frame is provided with a roller bearing seat installation groove. After the roller assembly is completed, the whole is placed in the inner cavity of the roll die frame, and the radial roller gap cannot be adjusted. The existing adjustable roll die generally comprises a roller assembly, a roll die frame, a slide and a roller gap adjusting device. The roller is installed on the slide and then placed in the adjustable roll die frame. An inclined surface is arranged on the slide, and a wedge is pressed against the slide. The wedge has a threaded hole, and the adjusting device is arranged. The wedge is connected with the adjusting sleeve through a screw rod, and the rotation of the adjusting sleeve can drive the wedge to move along the rolling direction. The radial movement of the slide is realized through the contact of the inclined surface, so as to achieve the purpose of adjusting the roller gap in the radial direction.

[0004] However, the existing adjustable roll die is adjusted offline manually. With the development of the pipe jacking production process, the unit output is gradually improved, and the accuracy of the steel pipe wall thickness is gradually improved. In order to improve the accuracy of the steel pipe wall thickness and reduce the loss of the steel pipe cutting head, the adjustable roll die needs to have the function of real-time online load adjustment of the roller gap. The existing adjustable roll die structure cannot meet the new process requirements. In addition, in the rolling process, the roller gap of the existing adjustable roll die cannot be adjusted online and is non-adjustable, which cannot meet the rolling requirements of real-time large reduction of the pipe head and tail end. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present application is to provide a roll former frame, a pipe jacking machine and an operating method thereof, which can reasonably adjust the roll gap in real time.

[0006] The specific technical scheme of the embodiments of the present application is:

[0007] A roll former frame, comprising:

[0008] A housing mechanism having opposite first and second end faces, a side wall face, and a containing cavity inside, the first end face having a first notch communicating with the containing cavity, the second end face having a second notch communicating with the containing cavity, and the side wall face having a cavity extending in the radial direction of the housing mechanism and communicating with the containing cavity;

[0009] A plurality of adjustable roll former mechanisms distributed circumferentially around the axis of the housing mechanism, each comprising a slide seat capable of moving in the radial direction and installed in the containing cavity, a roll assembly mechanism installed on the slide seat, a roll die installed on the roll assembly mechanism, the roll assembly mechanism allowing the roll to rotate under the driving of the tube, and a roll gap adjustment mechanism installed in the cavity, comprising a base and a sleeve fixed to the base, the sleeve having a through hole with a first step on the side wall of the through hole, a sliding member disposed in the through hole, the side wall of the sliding member having a second step matching the first step, one end of the sliding member and the base forming a hydraulic chamber, the base having a flow channel communicating with the hydraulic chamber, the first step being able to abut against the second step to allow the sliding member to slide within a preset range, and the other end of the sliding member abutting against the slide seat;

[0010] The first and second notches are used for the tube to pass through so that the plurality of rolls can roll the tube.

[0011] Preferably, the housing mechanism comprises a frame housing, one side of the frame housing being open, the other side of the frame housing being the second end face, the frame housing having the side wall face and the containing cavity with an opening formed by the side wall face and the second end face, a gland being disposed at one side of the frame housing, the gland forming the first end face, the gland limiting the slide seat in the axial direction, and the gland and the frame housing being fixed by a fixing mechanism.

[0012] Preferably, the inner side wall of the cavity has a third step, the base abuts against the third step to keep the base in the cavity; the sleeve is arranged on the side of the base close to the sliding base; the sleeve, the base and the mold frame shell are fixed by bolts to realize the fixation of the three and the close sealing arrangement between the sleeve and the base.

[0013] Preferably, at least one sealing ring is arranged between the outer side wall of the sliding member and the inner side wall of the sleeve.

[0014] Preferably, the side wall surface of the mold frame shell is provided with an opening, a bolt is arranged in the opening from the outside to the inside and screwed into the containing cavity and the end surface of the sliding base facing the sliding member; an elastic member is sleeved on the bolt, one end of the elastic member abuts against the mold frame shell, and the other end of the elastic member abuts against the head of the bolt, so that the sliding base has a movement tendency towards the roll gap adjusting mechanism, and the sliding base and the sliding member are closely fitted by the action force of the elastic member.

[0015] Preferably, the roll gap adjusting mechanism further comprises a position sensor for detecting the position of the sliding member; the roll mold frame further comprises a pressure liquid input unit connected with the flow channel; a control unit, the position sensor and the pressure liquid input unit are respectively electrically connected with the control unit, and the control unit controls whether the pressure liquid input unit inputs pressure liquid into the flow channel according to the position of the sliding member detected by the position sensor.

[0016] Preferably, the first notch on the gland extends radially outward from the center of the gland according to the number of the adjustable roll mold mechanism; the position where the first notch extends corresponds to the position of the roll, and the roll extends into the first notch; the side of the sliding base away from the gland abuts against the inner side wall of the second end surface of the mold frame shell, and the side of the sliding base towards the gland abuts against the gland, thereby limiting the sliding base in the axial direction; the sliding base comprises two support portions arranged side by side and a connecting portion connecting the end portions of the two support portions; the two support portions have a gap therebetween, and the roll is located in the gap; the side of the two support portions towards the gland is respectively provided with a containing groove extending in a direction perpendicular to the radial direction, and the roll assembly is arranged in the two containing grooves; the roll assembly comprises two bearing seats arranged in the containing grooves respectively; a rotating shaft penetrating through the two bearing seats, the roll is fixedly installed on the rotating shaft; and two bearings arranged between the rotating shaft and the two bearing seats respectively.

[0017] Preferably, the adjustable roll die mechanism is three, three of the adjustable roll die mechanism are evenly distributed around the axis of the housing mechanism, so that the included angle between adjacent adjustable roll die mechanism is 120 degrees.

[0018] A pipe jacking machine, comprising:

[0019] A bed mechanism, comprising: a bed base, two bed side plates oppositely arranged above the bed base, and a pressure plate;

[0020] The roll die frame of any of the above, the side wall surface of the housing mechanism has two opposite positioning keys, two of the positioning keys can be inserted into the tooth groove of the bed side plate, and the pressure plate is installed above the roll die frame and bolted to the bed mechanism to fix the roll die frame on the bed mechanism.

[0021] Preferably, the pipe jacking machine comprises a detection unit for detecting the head or tail of the pipe reaching the roll die frame.

[0022] The roll gap adjustment mechanism further comprises a position sensor for detecting the position of the sliding member; the roll die frame further comprises a pressure liquid input unit connected to the flow channel; a control unit, the position sensor and the pressure liquid input unit are electrically connected to the control unit respectively, the control unit controls whether the pressure liquid input unit inputs pressure liquid into the flow channel according to the position of the sliding member detected by the position sensor; the control unit is also electrically connected to the detection unit, when the detection unit detects that the head or tail of the pipe reaches the roll die frame, the control unit controls whether the pressure liquid input unit inputs pressure liquid into the flow channel, thereby reducing the roll gap formed by the roll, to realize the wall reduction rolling of the head or tail of the pipe.

[0023] An operation method using the pipe jacking machine as above, the operation method comprising:

[0024] When the detection unit detects that the head or tail of the pipe reaches the roll die frame, the pressure liquid input unit is controlled to input pressure liquid into the flow channel, so that the hydraulic chamber increases, the sliding member pushes the sliding seat to move towards the pipe, and then the roll gap formed by the roll is reduced;

[0025] When the head or tail of the pipe passes through the roll with the reduced roll gap, the roll performs wall reduction rolling on the head or tail of the pipe.

[0026] When the detection unit detects that the head of the pipe passes through the roll gap, the control unit controls the pressure fluid input unit to reduce the roll gap, the slide pushes the slide base to move away from the pipe, and the roll gap formed by the roll is increased to the initial position before the roll gap is reduced.

[0027] The technical scheme has the following remarkable beneficial effects:

[0028] First, the adjustable roll die mechanism in the roll die frame can automatically adjust the roll along the radial direction, thereby further improving the rolling precision of the product.

[0029] Second, the adjustable roll die mechanism in the roll die frame can automatically adjust the roll gap formed by the roll when the pipe jacking machine is online, thereby greatly reducing the replacement frequency of the roll die frame on the pipe jacking machine, and one roll die frame can meet the requirements of different roll gap sizes.

[0030] Third, the pipe jacking machine directly adjusts the roll gap formed by the roll when online, and the detection unit can control the control unit to control the pressure fluid input unit to reduce the roll gap in time when the head or tail of the pipe reaches the roll die frame, thereby performing head and tail trimming rolling on the pipe with thickened necking end, facilitating the rolling of the tension reducing mill in the subsequent rolling process, and improving the yield of the product.

[0031] With reference to the following description and drawings, specific embodiments of the present application are disclosed in detail, indicating the principles of the present application can be used. It should be understood that the embodiments of the present application are not limited in scope. The features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with the features in other embodiments, or replaced by the features in other embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportions of the components in the drawings are only illustrative and are used to help understand the present application, and are not specific limitations on the shapes and proportions of the components. Those skilled in the art can select various possible shapes and proportions to implement the present application according to specific circumstances under the guidance of the present application.

[0033] Figure 1 The structure of the roll die frame is shown in the partial cross-sectional view of the embodiment of the present application.

[0034] Figure 2 The structure of the roll die frame is shown in the partial cross-sectional view of the embodiment of the present application.

[0035] Figure 3Fig. 1 is a perspective view of a roller assembly mechanism with a roller in an embodiment of the present application;

[0036] Figure 4 Fig. 2 is a perspective view of a slide in an embodiment of the present application;

[0037] Figure 5 Fig. 3 is a front view of a pipe jacking machine in an embodiment of the present application;

[0038] Figure 6 Fig. 4 is a side view of a pipe jacking machine in an embodiment of the present application;

[0039] Figure 7 Fig. 5 is a schematic view of a pipe jacking process of a pipe jacking machine in an embodiment of the present application.

[0040] Reference signs of the above figures:

[0041] 1, housing mechanism; 11, first end face; 111, first notch; 12, second end face; 121, second notch; 13, side wall face; 14, accommodating cavity; 15, die carrier housing; 151, opening; 16, gland; 17, fixing mechanism; 18, cavity; 181, third step; 19, positioning key; 2, slide; 21, support part; 211, accommodating groove; 22, connecting part; 3, roller assembly mechanism; 31, bearing seat; 32, rotating shaft; 33, bearing; 4, roller; 5, roll gap adjustment mechanism; 51, base; 511, flow channel; 52, sleeve; 521, through hole; 522, first step; 53, sliding member; 531, second step; 54, hydraulic cavity; 6, elastic member; 100, bed mechanism; 101, bed base; 102, bed side plate; 103, pressing plate; 200, roller die frame; 300, fixed roller die frame; 400, blank pipe. DETAILED DESCRIPTION

[0042] The specific embodiments of the present application described herein are presented for purposes of illustration and description. They are not intended to be exhaustive of or to limit this application to the precise forms described. Many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the above teachings. Accordingly, this application is intended to embrace all alternatives, modifications, and variations which fall within the scope of this application. It is to be understood that before the application is embodied into practice, specific preferred embodiments of the application are made with additional aspects of the application being presented in dependence upon those specific embodiments. And, it is to be further understood that each of the embodiments can be combined with one or more other embodiments. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. As used herein, the term "about" when used in connection with a numerical value, means that the recited numerical value is intended to encompass amounts that are close to the indicated value, for example, within 10% of the indicated value. As used herein, the term "vertical" means a direction that is perpendicular to the horizontal plane. As used herein, the term "horizontal" means a direction that is parallel to the horizontal plane. As used herein, the terms "upper" and "lower" are used for the purpose of description only and are not intended to be limiting. As used herein, the terms "left" and "right" are used for the purpose of description only and are not intended to be limiting.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] The roll forming stand is an important equipment for hot-rolling seamless steel pipe production, wherein the roll forming stand provides the hole type for the rolling deformation of the steel pipe, and the structure and adjustment mode of the roll forming stand affect the precision and production efficiency of the product. In order to overcome the deficiencies of the prior art, so that the roll forming stand can be reasonably adjusted in real time, a roll forming stand 200 is provided in the application, Figure 1 A structure schematic diagram of the roll forming stand partially cut in the embodiment of the application, Figure 2 A side view of the roll forming stand partially cut in the embodiment of the application, as Figures 1-2As shown in the figure, the roller die frame 200 comprises: a housing mechanism 1, the housing mechanism 1 has opposite first end face 11 and second end face 12, side wall face 13, the housing mechanism 1 has a containing cavity 14 inside, the first end face 11 has a first gap 111 communicating with the containing cavity 14, the second end face 12 has a second gap 121 communicating with the containing cavity 14, the side wall face 13 has a cavity 18 extending along the radial direction of the housing mechanism 1 communicating with the containing cavity 14; a plurality of adjustable roller die mechanisms distributed circumferentially around the axis of the housing mechanism 1, the adjustable roller die mechanism comprises: a sliding seat 2 installed in the containing cavity 14 capable of moving in the radial direction; a roller assembly mechanism 3 installed on the sliding seat 2; a roller 4 installed on the roller assembly mechanism 3, the roller assembly mechanism 3 enables the roller 4 to rotate under the driving of the tube; a roller gap adjustment mechanism 5 installed in the cavity 18, which comprises: a base 51 and a sleeve 52 fixed with the base 51, the sleeve 52 has a through hole 521, the side wall of the through hole 521 has a first step 522; a sliding piece 53 arranged in the through hole 521, the side wall of the sliding piece 53 has a second step 531 matched with the first step 522, one end of the sliding piece 53 and the base 51 form a hydraulic chamber 54, the base 51 is provided with a flow channel 511 communicating with the hydraulic chamber 54, the first step 522 can abut against the second step 531 to make the sliding piece 53 slide within a preset interval, the other end of the sliding piece 53 abuts against the sliding seat 2; the first gap 111 and the second gap 121 are used for the tube 400 to pass through so that the plurality of rollers 4 can roll it.

[0045] As shown in the figure, Figure 1 and Figure 2 The roller die frame 200 can comprise: a housing mechanism 1 and an adjustable roller die mechanism. The housing mechanism 1 is used to install the adjustable roller die mechanism. In order to enable the adjustable roller die mechanism to be smoothly installed into the housing mechanism 1, the housing mechanism 1 has opposite first end face 11 and second end face 12, side wall face 13, the housing mechanism 1 has a containing cavity 14 inside, the first end face 11 has a first gap 111 communicating with the containing cavity 14, the second end face 12 has a second gap 121 communicating with the containing cavity 14, the side wall face 13 has a cavity 18 extending along the radial direction of the housing mechanism 1 communicating with the containing cavity 14. The containing cavity 14 is used to install and fix part of the adjustable roller die mechanism, and the cavity 18 is used to install and fix part of the adjustable roller die mechanism. The first gap 111 and the second gap 121 are used for the tube 400 to pass through so that the roller 4 in the adjustable roller die mechanism can roll it.

[0046] As shown in the figure, Figure 2As shown, the shell mechanism 1 can include a mold frame shell 15 and a gland 16. Among them, one side of the mold frame shell 15 is open, the other side of the mold frame shell 15 is the second end face 12, the mold frame shell 15 has a side wall surface 13, and the side wall surface 13 and the second end face 12 form a containing cavity 14 with an opening. The gland 16 is arranged at one side of the mold frame shell 15, and the gland 16 is used to close the open side of the mold frame shell 15, and the gland 16 forms the first end face 11. The gland 16 and the mold frame shell 15 can be detachably connected, so that when the gland 16 is separated from the mold frame shell 15, the adjustable roller die mechanism can be installed into the containing cavity 14 of the mold frame shell 15. The mold frame shell 15 is directly made of casting, and after the casting is completed, the inside is machined through the open side, so that the required structure for installing the adjustable roller die mechanism is formed.

[0047] The gland 16 can limit the position of part of the components in the adjustable roller die mechanism in the axial direction, for example, the position of the sliding seat 2 in the axial direction. The gland 16 and the mold frame shell 15 are fixed by a fixing mechanism 17, such as Figure 2 As shown, the fixing mechanism 17 can include a ring arranged outside the gland 16, the projection of the ring in the axial direction coincides with one side of the mold frame shell 15, and the projection of the ring in the axial direction also coincides with the outside of the gland 16, so that screws or bolts can be screwed into the ring in the axial direction to fix the ring with the gland 16, and screws or bolts can be screwed into the ring in the axial direction to fix the ring with one side of the mold frame shell 15.

[0048] As shown in Figure 1 The adjustable roller die mechanism can be multiple, and multiple are distributed in the circumferential direction around the axis of the shell mechanism 1. In order to enable the rollers 4 in the adjustable roller die mechanism to uniformly roll the pipe blank 400 in the circumferential direction, further, the adjustable roller die mechanism can be selected to be three, and the three adjustable roller die mechanisms are uniformly distributed in the circumferential direction around the axis of the shell mechanism 1, so that the included angle between adjacent adjustable roller die mechanisms is 120 degrees. The adjustable roller die mechanism in this number can achieve the best cost performance, and at the same time, it can also ensure that the adjustable roller die mechanism can be accommodated in the shell mechanism 1.

[0049] As shown in Figure 1 The adjustable roller die mechanism can include: a sliding seat 2 installed in the containing cavity 14 and capable of moving in the radial direction; a roller assembly mechanism 3 installed on the sliding seat 2; a roller 4 installed on the roller assembly mechanism 3, the roller assembly mechanism 3 enabling the roller 4 to rotate; and a roll gap adjustment mechanism 5 installed in the cavity 18. The inner side wall of the second end face 12 of the mold frame shell 15 can have a sliding groove extending in the radial direction, and the sliding seat 2 can be arranged in the sliding groove, thereby ensuring the accuracy of the sliding seat 2 moving in the radial direction.

[0050] Figure 4 This is a three-dimensional structural diagram of the slide in an embodiment of the present invention, as shown below. Figure 4 As shown, the slide 2 may include two support portions 21 arranged side by side and a connecting portion 22 connecting the ends of the two support portions 21. The support portions 21 extend radially along the housing mechanism 1, while the connecting portion 22 extends radially perpendicular to the housing mechanism 1. There is a gap between the two support portions 21, and the roll 4 is located in the gap. Each of the two support portions 21 has a receiving groove 211 extending radially perpendicularly on the side facing the pressure cover 16, and the roll assembly mechanism 3 is disposed in the two receiving grooves 211. After the roll assembly mechanism 3 is disposed in the two receiving grooves 211, the pressure cover 16 abuts against the roll assembly mechanism 3, thereby holding the roll assembly mechanism 3 in the receiving grooves 211.

[0051] Figure 3 This is a three-dimensional structural diagram of a roll assembly mechanism with rolls in an embodiment of the present invention, as shown below. Figure 1 , Figure 2 and Figure 3 As shown, the roll assembly mechanism 3 may include: two bearing seats 31 respectively disposed in the receiving groove 211; a rotating shaft 32 passing through the two bearing seats 31, on which the roll 4 is fixedly mounted; and two bearings 33 respectively disposed between the rotating shaft 32 and the two bearing seats 31. In this manner, the roll 4 can rotate together with the rotating shaft 32, while the bearing seats 31 are fixed in the receiving groove 211. The shapes of the bearing seats 31 and the receiving groove 211 are matched, ensuring that the bearing seats 31 cannot rotate within the receiving groove 211. Since the slide 2 can move radially, the roll assembly mechanism 3 mounted on the slide 2 will also drive the roll 4 to move radially, thus enabling adjustment of the roll gap size formed by the roll 4.

[0052] like Figure 2 As shown, to reduce the overall thickness of the housing mechanism 1, the first notch 111 on the pressure cap 16 extends radially outward from the center of the pressure cap 16, depending on the number of adjustable roller mold mechanisms. The position of the first notch 111 corresponds to the position of the roller 4, allowing a portion of the edge of the roller 4 to extend into the first notch 111. This allows a larger roller 4 to be accommodated within the housing mechanism 1 of the same size. Similarly, the second notch 121 on the second end face 12 of the mold frame housing 15 can also extend radially outward from the center of the mold frame housing 15, depending on the number of adjustable roller mold mechanisms. The position of the first notch 111 corresponds to the position of the roller 4, allowing a portion of the edge of the roller 4 to extend into the first notch 111.

[0053] like Figure 1 and Figure 2As shown, the roll gap adjusting mechanism 5 can be actively controlled automatically to adjust the position of the roll 4. The roll gap adjusting mechanism 5 can include a base 51, a sleeve 52 fixed to the base 51, and a sliding member 53. The sleeve 52 has a through hole 521 with a first step 522 on the side wall of the through hole 521. The sliding member 53 is arranged in the through hole 521 and has a second step 531 on the side wall of the sliding member 53, which cooperates with the first step 522. A hydraulic cavity 54 is formed between one end of the sliding member 53 and the base 51. The base 51 is provided with a flow channel 511 in communication with the hydraulic cavity 54. The first step 522 can abut against the second step 531 to allow the sliding member 53 to slide within a preset range. The other end of the sliding member 53 abuts against the sliding seat 2. In this way, the sliding member 53 can be prevented from being separated from the sleeve 52 after the hydraulic cavity 54 is filled with pressure fluid, so that the adjustment of the position of the roll 4 is within a certain range and cannot exceed the range, thereby achieving a certain protection effect. The flow channel 511 is used to inject pressure fluid into the hydraulic cavity 54 to drive the sliding member 53 to slide controllably in the radial direction and within the preset range. The sliding of the sliding member 53 can drive the sliding seat 2 to slide controllably in the radial direction. The roll assembly mechanism 3 mounted on the sliding seat 2 can also drive the roll 4 to move in the radial direction, so that the size of the roll gap formed by the roll 4 can be adjusted. Since the pressure fluid is injected into the hydraulic cavity 54 through the flow channel 511, the roll gap adjusting mechanism 5 can be automatically controlled, and the entire roll die frame 200 can be adjusted in real time online according to the requirements.

[0054] As shown in Figure 1 and Figure 2 The inner side wall of the cavity 18 has a third step 181, and the base 51 abuts against the third step 181 to keep the base 51 in the cavity 18. The sleeve 52 is arranged on the side of the base 51 close to the sliding seat 2. The sleeve 52, the base 51, and the die frame shell 15 are fixed by bolts to realize the fixation of the three and the close sealing between the sleeve 52 and the base 51, thereby ensuring the sealing of the hydraulic cavity 54. Due to the presence of the first step 522, the inner diameter of the side wall of the through hole 521 close to one end of the base 51 is greater than the inner diameter of the side wall of the through hole 521 away from the base 51. Therefore, when the base 51 and the sleeve 52 are disassembled, the sliding member 53 can be installed into the through hole 521. The bolts pass through the base 51 from the sleeve 52 and are screwed into the die frame shell 15 to fix the sleeve 52, the base 51, and the die frame shell 15.

[0055] As shown in Figure 1As shown, due to the hydraulic cavity 54 formed between one end of the sliding member 53 and the base 51, in order to improve the sealing performance of the hydraulic cavity 54 and ensure the smooth relative sliding between the sliding member 53 and the sleeve 52, at least one sealing ring is arranged between the outer sidewall of the sliding member 53 and the inner sidewall of the sleeve 52. The sealing ring can be arranged in the annular groove on the outer sidewall of the sliding member 53 or the inner sidewall of the sleeve 52. The more the number of annular grooves, the more the number of sealing rings, and the better the sealing performance between the sliding member 53 and the sleeve 52.

[0056] As shown in Figure 1 and Figure 2 , the side wall surface 13 of the mold frame housing 15 is provided with an opening hole 151, and a bolt is arranged in the opening hole 151 from the outside to the inside and screwed into the receiving cavity 14 and the end surface of the slide 2 facing the sliding member 53. The bolt is sleeved with an elastic member 6, which can generally be selected as a spring. One end of the elastic member 6 abuts against the mold frame housing 15, and the other end of the elastic member 6 abuts against the head of the bolt. The elastic member 6 makes the slide 2 have a movement tendency towards the roll gap adjusting mechanism 5. In the above manner, the entire slide 2 can be tightly attached to the sliding member 53 at one end of the sliding member 53, and there is no gap between the two. This can ensure that the slide 2 always maintains the same sliding amount synchronously with the sliding member 53 when the sliding member 53 is adjusted by hydraulic pressure. This can improve the accuracy of the position adjustment of the roller 4. Especially when the pressure of the pressure liquid in the hydraulic cavity 54 decreases, the sliding member 53 moves away from the axis of the housing mechanism 1, and the sliding member 53 cannot directly drive the slide 2 to move away from the axis of the housing mechanism 1. Under the action of the elastic member 6, the slide 2 always has a movement tendency towards the roll gap adjusting mechanism 5. The slide 2 is tightly attached to the sliding member 53 by the action of the elastic member 6. This can ensure that the slide 2 always moves away from the axis of the housing mechanism 1 synchronously with the sliding member 53, thereby achieving the purpose of accurately adjusting the position of the roller 4.

[0057] The roll gap adjusting mechanism 5 can further comprise a position sensor for detecting the position of the sliding member 53. For example, the position sensor can be mounted on the sliding member 53. The roll die frame 200 further comprises a pressure fluid input unit connected to the flow channel 511, the pressure fluid input unit being capable of generating and inputting pressure fluid to the flow channel 511 to drive the sliding member 53 to move; a control unit, the position sensor and the pressure fluid input unit being electrically connected to the control unit respectively, the control unit controlling whether the pressure fluid input unit inputs pressure fluid to the flow channel 511 according to the position of the sliding member 53 detected by the position sensor. The position sensor can detect the position of the sliding member 53 in real time, thereby feeding back the position of the sliding member 53 to the control unit in real time, the control unit can compare the position of the sliding member 53 fed back by the position sensor with the required position, and then control whether the pressure fluid input unit inputs pressure fluid to the flow channel 511, so that the actual position of the sliding member 53 is consistent with the required position.

[0058] The roll die frame 200 in the present application can be assembled as follows: the roll assembly mechanism 3 with the roll 4 is mounted to the sliding seat 2; the roll gap adjusting mechanism 5 is mounted into the cavity 18 of the die frame shell 15, specifically, the base 51 is mounted into the cavity 18 and abuts against the third step 181, the sliding member 53 is first mounted into the sleeve 52, and then the sliding member 53 and the sleeve 52 are mounted into the cavity 18 together, and then the sleeve 52, the base 51 and the die frame shell 15 are fixed by bolts. Then the sliding seat 2 with the roll assembly mechanism 3 is hoisted and mounted into the containing cavity 14 in the die frame shell 15, and the sliding seat 2 is matched with the sliding groove of the second end face 12 of the die frame shell 15. Then the bolt is sleeved into the elastic member 6, and the bolt is extended into the opening 151 formed in the side wall 13 of the die frame shell 15, and the bolt is extended into the containing cavity 14 from the outside to the inside and is screwed into the end face of the sliding seat 2 facing the sliding member 53, and the degree of screwing of the bolt is adjusted so that the end of the sliding seat 2 facing the sliding member 53 is tightly attached to the sliding member 53, and no gap exists between the sliding seat 2 and the sliding member 53. The pressing cover 16 is mounted on the die frame shell 15, the pressing cover 16 abuts against the sliding seat 2 to limit the sliding seat 2 in the axial direction, the first notch 111 on the pressing cover 16 is located corresponding to the position of the roll 4, and then the fixed mechanism 17 is used to fixedly connect the pressing cover 16 and the die frame shell 15.

[0059] The present application also provides a pipe jacking machine, Figure 5 Figure 1 is a front view of the pipe jacking machine according to the present application, Figure 6 Figure 2 is a side view of the pipe jacking machine according to the present application, as Figure 5 and Figure 6 As shown in Figures 1 and 2, the pipe jacking machine can comprise a bed mechanism 100 comprising a bed base 101, two bed side plates 102 oppositely arranged above the bed base 101, and a pressing plate 103; and a roll die frame 200 according to any one of the above. Figure 1As shown, the side wall surface 13 of the housing mechanism 1 has two opposite positioning keys 19, which can be inserted into the tooth groove of the side plate 102 of the bed mechanism 100, so that the roller die frame 200 is positioned and installed on the bed mechanism 100. The pressing plate 103 is installed above the roller die frame 200 and is bolted to the bed mechanism 100, so as to fix the roller die frame 200 on the bed mechanism 100, so that the roller die frame 200 cannot be separated upward from the bed mechanism 100. Of course, as Figure 5 As shown, the top pipe machine can also include a plurality of fixed roller die frames 300 that cannot adjust the size of the roll gap formed by the rollers 4 in real time. The fixed roller die frames 300 can also be installed on the bed mechanism 100 in the above-mentioned similar manner. The roller die frame 200 can be located at the leftmost or rightmost end of the plurality of fixed roller die frames 300. Through the above-mentioned installation manner, the installation of the roller die frame 200, the fixed roller die frame 300, etc. on the bed mechanism 100 is convenient, and the requirement of quick replacement is realized, so that the top pipe machine adapts to the characteristics of small batch and multi-specification rolling process. Figure 7 The top pipe process schematic diagram of the embodiment of the present application is shown in the following figure: Figure 7 As shown, when the pipe blank 400 is being rolled, if it is necessary to further roll and adjust the wall thickness of the local part of the pipe blank 400, the control unit only needs to control the pressure fluid input unit to input pressure fluid to the flow channel 511, so as to drive the sliding member 53 to move, and the sliding member 53 can drive the slide 2 installed with the roller 4 to move in the radial direction and keep the roller 4 at the required position, so that the adjustment of the roller gap is realized on-line and in real time. For example, through on-line adjustment, the wall reduction rolling of the head or tail of the pipe blank 400 is realized.

[0060] Further, the top pipe machine can also include a detection unit for detecting the arrival of the head or tail of the pipe blank 400 at the roller die frame 200. The control unit is also electrically connected with the detection unit. When the detection unit detects that the head or tail of the pipe blank 400 arrives at the roller die frame 200, the control unit controls whether the pressure fluid input unit inputs pressure fluid to the flow channel 511, so as to reduce the roll gap formed by the roller 4, so as to realize the wall reduction rolling of the head or tail of the pipe blank 400. Through the above-mentioned manner, the wall reduction rolling of the head or tail of the pipe blank 400, i.e. the head-tail sharpening function, can be automatically realized. The remaining part of the pipe blank 400 can still pass through the roller die frame 200 and only be conventionally rolled. Only when the head or tail of the pipe blank 400 passes through, the automatic detection is realized through the detection unit, so as to feed back the information to the control unit, so that the control unit controls the reduction of the roll gap formed by the roller 4, so as to realize the wall reduction rolling of the head or tail of the pipe blank 400. As a feasible manner, the detection unit can be an image sensor, a position sensor, etc.

[0061] The application also provides an operation method of the pipe jacking machine, which can include:

[0062] When the detection unit detects that the head or tail of the pipe 400 reaches the roll die frame, the control pressure liquid input unit inputs pressure liquid to the flow channel 511, so that the hydraulic chamber 54 is enlarged, the sliding part 53 pushes the sliding seat 2 to move towards the pipe 400, and then the roll gap formed by the roll 4 is reduced;

[0063] When the head or tail of the pipe 400 passes through the roll 4 with the reduced roll gap, the roll 4 performs wall-reducing rolling on the head or tail of the pipe 400;

[0064] When the detection unit detects that the head of the pipe 400 passes through the roll gap, the control pressure liquid input unit makes the hydraulic chamber 54 shrink, the sliding part 53 pushes the sliding seat 2 to move away from the pipe 400, and then the roll gap formed by the roll 4 is increased to the initial position before the roll gap is reduced. In this step, the pipe jacking machine starts rolling from the head of the pipe, so after the head of the pipe 400 passes through the roll gap, the middle part of the pipe 400 needs to be rolled next, so the roll gap formed by the roll 4 needs to be increased to the initial position before the roll gap is reduced, which forms a roll gap required for rolling the middle part of the pipe 400.

[0065] The application can have the following effective effects. First, the adjustable roll die mechanism in the roll die frame 200 can automatically adjust the roll 4 along the radial direction, thereby further improving the rolling precision of the product. Second, the adjustable roll die mechanism in the roll die frame 200 can directly and automatically adjust the roll gap formed by the roll 4 when the pipe jacking machine is online, which greatly reduces the replacement frequency of the roll die frame 200 on the pipe jacking machine, and one roll die frame 200 can meet the requirements of different roll gap sizes. Third, the pipe jacking machine directly adjusts the roll gap formed by the roll 4 when it is online, and through the detection unit, the control unit can control the pressure liquid input unit to immediately reduce the roll gap formed by the roll 4 when the head or tail of the pipe 400 reaches the roll die frame 200, thereby performing head and tail trimming rolling on the pipe 400 with the thickened necking end, which is beneficial to the rolling of the tension reducing mill in the subsequent rolling process, so as to improve the yield of the product.

[0066] All articles and references, including patent applications and publications, disclosed herein are hereby incorporated by reference for all purposes. The term "consisting essentially of to describe a combination shall include the elements, ingredients, components or steps identified, and such other elements, ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps are optional, and the use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps are optional, and that statements of

[0067] The various embodiments in the specification are described in progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the various embodiments can be mutually referred to. The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A roller die frame, characterized in that, The roller mold frame includes: A housing mechanism having opposing first and second end faces and sidewalls, an internal cavity, a first notch communicating with the cavity on the first end face, a second notch communicating with the cavity on the second end face, and a cavity extending radially along the housing mechanism communicating with the cavity on the sidewalls. Multiple adjustable roller die mechanisms are circumferentially distributed around the axis of the housing mechanism. Each adjustable roller die mechanism includes: a slide block installed in the receiving cavity and capable of radial movement; a roller assembly mechanism installed on the slide block; a roller installed on the roller assembly mechanism, which enables the roller to rotate under the drive of a capillary tube; and a roller gap adjustment mechanism installed within the cavity, comprising: a base and a sleeve fixed to the base, the sleeve having a through hole, the side wall of the through hole having a first step; a sliding member disposed in the through hole, the side wall of the sliding member having a second step cooperating with the first step, one end of the sliding member forming a hydraulic cavity with the base, the base having a flow channel communicating with the hydraulic cavity, the first step abutting against the second step to allow the sliding member to slide within a preset range, and the other end of the sliding member abutting against the slide block. The first notch and the second notch are used to allow the tube to pass through so that it can be rolled by the plurality of rolls; The housing mechanism includes a mold frame housing and a pressure cap; an opening is provided on the side wall of the mold frame housing, and a bolt is passed through the opening from the outside to the inside into the receiving cavity and screwed into the end face of the slide block facing the sliding member; an elastic element is sleeved on the bolt, one end of the elastic element abuts against the mold frame housing, and the other end of the elastic element abuts against the head of the bolt. The elastic element causes the slide block to have a tendency to move towards the roll gap adjustment mechanism, and the force of the elastic element makes the slide block and the sliding member fit tightly together.

2. The roller die frame according to claim 1, characterized in that, One side of the mold frame housing is open, and the other side of the mold frame housing is the second end face. The mold frame housing has the side wall surface, and the side wall surface and the second end face form an open receiving cavity. The pressure cover is disposed on one side of the mold frame housing, and the pressure cover forms the first end face. The pressure cover limits the slide in the axial direction, and the pressure cover and the mold frame housing are fixed by a fixing mechanism.

3. The roller die frame according to claim 2, characterized in that, The inner wall of the cavity has a third step, and the base abuts against the third step to keep the base in the cavity; the sleeve is disposed on the side of the base near the slide; the sleeve, the base and the mold frame housing are fixed by bolts, and a tight seal is achieved between the sleeve and the base.

4. The roller die frame according to claim 2, characterized in that, At least one sealing ring is provided between the outer wall of the sliding member and the inner wall of the sleeve.

5. The roller die frame according to claim 1, characterized in that, The roll gap adjustment mechanism further includes: a position sensor for detecting the position of the sliding member; the roll mold frame further includes: a pressure fluid input unit connected to the flow channel; and a control unit, wherein the position sensor and the pressure fluid input unit are electrically connected to the control unit, and the control unit controls whether the pressure fluid input unit inputs pressure fluid into the flow channel according to the position of the sliding member detected by the position sensor.

6. The roller die frame according to claim 2, characterized in that, The first notch on the pressure cap extends radially outward from the center of the pressure cap according to the number of adjustable roller mold mechanisms; the position of the first notch corresponds to the position of the roller, and the roller extends into the first notch; the side of the slide away from the pressure cap abuts against the inner wall of the second end face of the mold frame housing, and the side of the slide facing the pressure cap abuts against the pressure cap, thereby limiting the slide in the axial direction; the slide includes two support parts arranged side by side and a connecting part connecting the ends of the two support parts; there is a gap between the two support parts, and the roller is located in the gap; the side of the two support parts facing the pressure cap each has a receiving groove extending in a direction perpendicular to the radial direction, and the roller assembly mechanism is disposed in the two receiving grooves; The roll assembly mechanism includes: two bearing seats respectively disposed in the receiving groove; a rotating shaft passing through the two bearing seats, the roll being fixedly mounted on the rotating shaft; and two bearings respectively disposed between the rotating shaft and the two bearing seats.

7. The roller die frame according to claim 1, characterized in that, There are three adjustable roller mold mechanisms, which are evenly distributed circumferentially around the axis of the housing mechanism so that the included angle between adjacent adjustable roller mold mechanisms is 120 degrees.

8. A pipe jacking machine, characterized in that, The pipe jacking machine includes: The bed frame mechanism includes: a bed frame base, two bed frame side plates disposed opposite each other above the bed frame base, and a pressure plate; As described in any one of claims 1 to 7, the side wall of the housing mechanism has two opposing positioning keys, which can be respectively inserted into the tooth grooves of the bed side plate. The pressure plate is installed above the roller mold frame and is bolted to the bed mechanism to fix the roller mold frame to the bed mechanism.

9. The pipe jacking machine according to claim 8, characterized in that, The pipe jacking machine includes: a detection unit, which is used to detect whether the head or tail of the tube reaches the roller mold frame; The roll gap adjustment mechanism further includes: a position sensor for detecting the position of the sliding member; the roll die frame further includes: a pressure fluid input unit connected to the flow channel; a control unit, wherein the position sensor and the pressure fluid input unit are electrically connected to the control unit, and the control unit controls whether the pressure fluid input unit inputs pressure fluid into the flow channel according to the position of the sliding member detected by the position sensor; the control unit is also electrically connected to the detection unit, and when the detection unit detects that the head or tail of the tube reaches the roll die frame, the control unit controls whether the pressure fluid input unit inputs pressure fluid into the flow channel, thereby reducing the roll gap formed by the rolls to achieve wall reduction rolling of the head or tail of the tube.

10. An operating method using the pipe jacking machine as described in claim 9, characterized in that, The operation method includes: When the detection unit detects that the head or tail of the tube has reached the roller die frame, it controls the pressure fluid input unit to input pressure fluid into the flow channel, thereby increasing the hydraulic chamber, and the sliding member pushes the slide block to move towards the tube, thereby reducing the roll gap formed by the roll. When the head or tail of the tube passes through the roll with the reduced roll gap, the roll performs wall reduction rolling on the head or tail of the tube. When the detection unit detects that the head of the tube has passed through the roll gap, it controls the pressure fluid input unit to reduce the hydraulic chamber. The sliding member pushes the slide block to move away from the tube, thereby increasing the roll gap formed by the roll to the initial position before the roll gap decreased.

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