Incremental expansion self-conveying type central tool magazine and working method thereof

Abstract

The invention relates to the field of tool magazines, in particular to an incremental expansion self-conveying type central tool magazine and a working method thereof. Comprising a chain type tool magazine, a fixing frame, a first fixing pipe fitting, a second fixing pipe fitting and a rotary knob piece. The chain type tool magazine is spirally arranged on a plane; the fixing frame is located on the periphery of a chain of the chain type tool magazine and right faces a chain link of the chain, and the fixing frame is used for arranging the fixing base. The first positioning pipe fittings are fixed to one sides of the back faces of the fixing frames, the second positioning pipe fittings are fixed to the other sides of the back faces of the fixing frames, and the first positioning pipe fitting on the back face of one fixing frame is rotationally connected with the second positioning pipe fitting on the back face of the adjacent fixing frame. The rotary knob piece is rotationally installed on the second positioning pipe fitting, and when the rotary knob piece rotates to cover the opening, the inner surface of the rotary knob piece protrudes and fills the opening. The swing of the chain in the vertical direction in the running process is avoided, the abrasion of the chain in the transmission process is reduced, and the transmission stability of the chain and the positioning precision of a cutter are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tool magazines, in particular to an incremental expansion self-conveying central tool magazine and a working method thereof. BACKGROUND

[0002] A tool magazine is a kind of tool storage or tool changing device of a numerical control machining center. As an important tool magazine, a chain tool magazine has been widely applied in numerical control machining centers due to its large capacity.

[0003] Compared with a disc guide rail, although the chain tool magazine has the advantage of large tool capacity, the chain type structure of the traditional chain tool magazine adopts the mode of placing tools on the chain. The chain needs to move back and forth when running, and cannot realize rigid support of all the chains. That is to say, for the chain tool magazine, the chain is both a bearing system and a transmission system. Therefore, the chain tool magazine has the problems of poor mechanical rigidity and poor positioning accuracy. Similarly, although the current chain tool magazine has large capacity, most of them realize the capacity expansion of the tool magazine by using space displacement, which is difficult to apply in a space-limited position. SUMMARY

[0004] Therefore, it is necessary to provide an incremental expansion self-conveying central tool magazine and a working method thereof to avoid the shaking of the chain in the vertical direction during the running of the chain, reduce the wear of the chain during transmission, and improve the transmission stability of the chain and the positioning accuracy of the tool.

[0005] The present application provides an incremental expansion self-conveying central tool magazine, comprising:

[0006] The chain tool magazine is arranged in a spiral manner on a plane, so as to increase the length and capacity of the chain tool magazine.

[0007] The fixed frame is located at the periphery of the chain of the chain tool magazine and faces the chain link. The fixed frame is used for arranging a fixed seat, so as to load the tool.

[0008] The first positioning pipe and the second positioning pipe are fixed at one side of the back surface of the fixed frame and the other side of the back surface of the fixed frame, respectively. The first positioning pipe of one fixed frame back surface is rotationally connected with the second positioning pipe of an adjacent fixed frame back surface.

[0009] The first positioning pipe and the second positioning pipe are fixed at one side of the back surface of the fixed frame and the other side of the back surface of the fixed frame, respectively. The first positioning pipe of one fixed frame back surface is rotationally connected with the second positioning pipe of an adjacent fixed frame back surface.

[0010] A knob is rotatably installed on the second positioning tube, and when the knob is rotated to cover the opening, the inner surface of the knob protrudes and fills the opening.

[0011] In one embodiment, the chain tool magazine is fixed on a plane of one side of a machine tool, and a three-coordinate adjusting member is arranged on the adjacent other side of the machine tool, and an end of the three-coordinate adjusting member is provided with a tool changing mechanism for changing tools in the chain tool magazine.

[0012] In one embodiment, the first positioning tube includes a first fixed plate and a first fixed tube, two first fixed plates are arranged on the back of the fixed frame, and the first fixed tube is fixed on one side of the first fixed plate; the second positioning tube includes a second fixed plate and a second fixed tube, the second fixed plate is arranged on the back of the fixed frame and located between the two first fixed plates, and the second fixed tube is located on the other side of the second fixed plate; the coaxially arranged first fixed tube and second fixed tube are rotatably connected through a pin shaft.

[0013] In one embodiment, the knob includes an annular limiting member, a top block, and a return spring, the inner surface of the annular limiting member is provided with a first clamping groove in an annular structure, the annular limiting member is threadedly installed on the first fixed tube, a plurality of top blocks are arranged in an annular array, the bottom ends of the plurality of top blocks are located in the annular limiting member, and the plurality of top blocks are elastically connected toward the central axis of the annular limiting member through a plurality of return springs, respectively.

[0014] In one embodiment, the annular limiting member includes a first fixed ring, a second fixed ring, a second fixed rod, and a first limiting plate, two first fixed rings are coaxially arranged, and the interval between the two first fixed rings constitutes the first clamping groove, the cross section of the second fixed ring is provided in an arc structure, the two ends of the second fixed ring are connected to the outer surfaces of the other first fixed rings, respectively, a plurality of second fixed rods are arranged in an annular array, one end of each second fixed rod is fixed to the inner surface of the second fixed ring, and the other end of each second fixed rod is toward the central axis of the first fixed ring, and a plurality of first limiting plates are arranged, and each first limiting plate is fixed to one end of the second fixed rod toward the central axis of the first fixed ring, and each first limiting plate is located in the first clamping groove.

[0015] In one embodiment, one end of the top block toward the central axis of the first fixed ring is provided with an arc surface, the arc surface is located in the same curved surface profile range as the surface of the mounting cavity, the other end of the top block is provided with a third clamping groove, the first limiting plate and the second fixed rod are movably clamped in the third clamping groove, and the end of the top block provided with the third clamping groove is further provided with a second limiting plate.

[0016] In one embodiment, a first fixing rod is arranged through the middle of the chain link, the first fixing rod is fixed on the chain link through two fastening bolts, a first connecting piece and a second connecting piece are rotatably arranged between the two first fixing plates and the second fixing plate, the first connecting piece and the second connecting piece can be rotated towards each other, and one end of the first connecting piece and the second connecting piece is movably sleeved on the first fixing rod.

[0017] In one embodiment, a first installation hole is formed in the first fixing plate, a second installation hole is formed in the second fixing plate, the first connecting piece comprises a first installation rod, a third fixing tube, a first arc-shaped plate, a first connecting plate, a third fixing rod, a second connecting plate and a first limiting spring, the first installation rod is rotatably arranged in a group of coaxially arranged first installation holes and second installation holes, the third fixing tube is provided with two and is sleeved on both ends of the first installation rod, the first arc-shaped plate is provided with two and is abutted on one side of the first fixing rod away from the first installation rod, the third fixing tube and the first arc-shaped plate are connected through two symmetrically arranged first connecting plates, the third fixing tube is provided with a third fixing rod, the third fixing rod is sleeved with a first limiting spring, and one end of the first limiting spring towards the first fixing rod is connected with a second connecting plate.

[0018] In one embodiment, the second connecting piece comprises a second installation rod, a fourth fixing tube, a second arc-shaped plate, a third connecting plate, a fourth fixing rod, a fourth connecting plate and a second limiting spring, the second installation rod is rotatably arranged in another group of coaxially arranged first installation holes and second installation holes, the fourth fixing tube is provided with two and is sleeved on both ends of the second installation rod, the second arc-shaped plate is provided with two and is abutted on one side of the first fixing rod away from the second installation rod, the fourth fixing tube and the second arc-shaped plate are connected through two symmetrically arranged third connecting plates, the fourth fixing tube is provided with a fourth fixing rod, the fourth fixing rod is sleeved with a second limiting spring, and one end of the second limiting spring towards the first fixing rod is connected with a fourth connecting plate.

[0019] The application also provides a working method of the incrementally expanded self-conveying central tool magazine, which is applied to the incrementally expanded self-conveying central tool magazine in any of the above embodiments, and the method comprises the following steps.

[0020] Before tool changing, the chain tool magazine is started and the chain is driven, so that the fixing seat loaded with the required tool is moved to the tool changing position;

[0021] Subsequently, a structure or substance for reducing friction is added in the mounting cavity between the first positioning pipe and the second positioning pipe, and then the knob part is screwed to cover the opening, at which time the inner surface of the knob part protrudes and fills the opening;

[0022] When the tool is changed, the fixed seat loaded with the required tool rotates on the fixed frame to make the tool face the tool changing mechanism for subsequent tool changing.

[0023] The above incremental expansion self-conveying central tool magazine and its working method, before tool changing, starts the chain tool magazine and drives the chain to move the fixed seat loaded with the required tool to the tool changing position, subsequently adds a structure or substance for reducing friction in the mounting cavity between the first positioning pipe and the second positioning pipe, and then screws the knob part to cover the opening, at which time the inner surface of the knob part protrudes and fills the opening, the structure of the rotating connection of the first positioning pipe and the second positioning pipe avoids the shaking of the chain in the vertical direction during the operation of the chain, reduces the wear of the chain during the transmission process, improves the transmission stability of the chain and the positioning accuracy of the tool, and since the lubricating part and the lubricant inside the mounting cavity can be filled and removed, and the opening of the mounting cavity can be opened and closed by rotating the knob part, it is more convenient to maintain and replace the filled lubricating part or lubricant during subsequent tool changing, when the tool is changed, the fixed seat loaded with the required tool rotates on the fixed frame to make the tool face the tool changing mechanism for subsequent tool changing. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 A perspective structural schematic diagram of the central tool magazine provided by the present application;

[0026] Figure 2 One of the partial structural schematic diagrams of the chain tool magazine provided by the present application;

[0027] Figure 3 The second partial structural schematic diagram of the chain tool magazine provided by the present application;

[0028] Figure 4 The structural schematic diagram of the first positioning pipe and the second positioning pipe provided by the present application;

[0029] Figure 5 The split structural schematic diagram of the knob part provided by the present application;

[0030] Figure 6 Structure diagram of the first connecting piece provided by the present application;

[0031] Figure 7 Structure diagram of the second connecting piece provided by the present application.

[0032] Reference signs:

[0033] 100, machine tool; 200, chain tool magazine; 210, fixed frame; 220, fixed seat; 230, coaming; 240, operation space; 250, first fixed rod; 260, fastening bolt; 300, three-coordinate adjusting piece; 400, tool changing mechanism; 510, first positioning pipe piece; 511, first fixed plate; 512, first fixed pipe; 513, first mounting hole; 520, second positioning pipe piece; 521, second fixed plate; 522, second fixed pipe; 523, second mounting hole; 524, opening; 530, mounting cavity; 600, pin shaft; 700, knob piece; 711, first fixed ring; 712, second fixed ring; 713, second fixed rod; 714, first limiting plate; 715, first clamping groove; 716, second clamping groove; 721, top block; 722, second limiting plate; 723, third clamping groove; 724, arc surface; 730, return spring; 810, first connecting piece; 811, first mounting rod; 812, third fixed pipe; 813, first arc plate; 814, first connecting plate; 815, third fixed rod; 816, second connecting plate; 817, first limiting spring; 820, second connecting piece; 821, second mounting rod; 822, fourth fixed pipe; 823, second arc plate; 824, third connecting plate; 825, fourth fixed rod; 826, fourth connecting plate; 827, second limiting spring. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] The present application is described below with reference to the drawings. Figures 1 to 7 An incremental expansion self-conveying central tool magazine and a working method thereof are described.

[0036] As Figures 1 to 3As shown, in one embodiment, an incremental expansion self-feeding central tool magazine comprises a chain tool magazine 200, a fixed frame 210, a first fixed tube 512, a second fixed tube 522 and a knob 700; the chain tool magazine 200 is arranged in a spiral on a plane, thereby increasing the length and capacity of the chain tool magazine 200; the fixed frame 210 is located at the periphery of the chain of the chain tool magazine 200 and faces the chain link, and the fixed frame 210 is used to set a fixed seat 220, thereby loading the tool; the first positioning tube 510 is fixed on one side of the back of the fixed frame 210, the second positioning tube 520 is fixed on the other side of the back of the fixed frame 210, and the first positioning tube 510 on the back of one fixed frame 210 is rotationally connected with the second positioning tube 520 on the back of an adjacent fixed frame 210; the first positioning tube 510 and the second positioning tube 520 are provided with a mounting cavity 530 at the abutting position, the mounting cavity 530 is used to add a structure or a substance for reducing friction, the first positioning tube 510 is provided with an opening 524 at one end abutting the second positioning tube 520, and the structure or the substance for reducing friction is added to the mounting cavity 530 through the opening 524; the knob 700 is rotationally installed on the second positioning tube 520, and when the knob 700 is rotated to cover the opening 524, the inner surface of the knob 700 protrudes and fills the opening 524.

[0037] The above-mentioned incremental expansion self-feeding central tool magazine, before tool changing, starts the chain tool magazine 200 and drives the chain, thereby moving the fixed seat 220 loaded with the required tool to the tool changing position, then adding a structure or a substance for reducing friction in the mounting cavity 530 between the first positioning tube 510 and the second positioning tube 520, and then rotating the knob 700 to cover the opening 524, at this time the inner surface of the knob 700 protrudes and fills the opening 524, the structure of the rotationally connected first positioning tube 510 and second positioning tube 520 avoids the shaking of the chain in the vertical direction during the operation of the chain, reduces the wear of the chain during the transmission process, improves the transmission stability of the chain and the positioning accuracy of the tool, and because the lubricating member and the lubricant in the mounting cavity 530 can be disassembled and filled, and the opening 524 of the mounting cavity 530 can be opened and closed by rotating the knob 700, it is more convenient to maintain and replace the filled lubricating member or lubricant, and when tool changing, the fixed seat 220 loaded with the required tool rotates on the fixed frame 210 to make the tool face the tool changing mechanism 400 for subsequent tool changing.

[0038] In one embodiment, the chain tool magazine 200 is fixed on the plane of one side of the machine tool 100, and the three-coordinate adjusting member 300 is arranged on the adjacent other side of the machine tool 100, the end of the three-coordinate adjusting member 300 is provided with the tool changing mechanism 400 for tool changing of the tool in the chain tool magazine 200.

[0039] Specifically, since the space on the side of the machine tool 100 is limited, in order to realize the incremental expansion of the tool magazine, the chain tool magazine 200 can be arranged in a spiral manner, so as to make full use of the limited space on the side of the machine tool 100. When the tool is changed, the three-coordinate adjusting part 300 is started, and the tool changing mechanism 400 is moved to the side of the chain tool magazine 200. The chain tool magazine 200 is provided with a surrounding plate 230, and the tool changing position is arranged in a vacant manner, and constitutes an operation space 240. When the tool is changed, the tool changing mechanism 400 moves to the operation space 240 to take and change the tool.

[0040] As shown in Figure 4 In one embodiment, the first positioning pipe 510 includes a first fixed plate 511 and a first fixed pipe 512. The back of the fixed frame 210 is provided with two first fixed plates 511, and the first fixed pipe 512 is fixed on one side of the first fixed plate 511. The second positioning pipe 520 includes a second fixed plate 521 and a second fixed pipe 522. The second fixed plate 521 is arranged on the back of the fixed frame 210 and located between the two first fixed plates 511. The second fixed pipe 522 is located on the other side of the second fixed plate 521. The coaxially arranged first fixed pipe 512 and the second fixed pipe 522 are rotationally connected through the pin shaft 600.

[0041] Specifically, the first fixed pipe 512 is located at the corner of one side end of the first fixed plate 511, and the second fixed pipe 522 is located at the corner of the other side end of the second fixed plate 521. The distance between the first fixed pipe 512 and the fixed frame 210 is equal to the distance between the second fixed pipe 522 and the fixed frame 210. When installing the adjacent two fixed frames 210, the second fixed pipe 522 on one fixed frame 210 is clamped into the two first fixed pipes 512 on the other fixed frame 210, and then the pin shaft 600 is inserted into the two first fixed pipes 512 and the second fixed pipe 522 to complete the rotational connection of the two.

[0042] As shown in Figure 5 In one embodiment, the knob 700 includes an annular limiting part, a top block 721 and a return spring 730. The inner surface of the annular limiting part is provided with a first clamping groove 715 in an annular structure. The annular limiting part is screw-mounted on the first fixed pipe 512. The top block 721 is arranged in an annular array, and the bottom end of the plurality of top blocks 721 is located in the annular limiting part and is elastically connected to the central axis of the annular limiting part through the plurality of return springs 730.

[0043] Specifically, the knob 700 is screwed on the first fixed tube 512 in normal state, at this time, the ends of the plurality of top blocks 721 abut against the outer surface of the first fixed tube 512, and the opening 524 needs to be closed after the lubricating structure or substance is filled into the installation cavity 530 through the opening 524, at this time, the knob 700 can be rotated to cover one end of the knob 700 to the outer surface of the second fixed tube 522, until the plurality of top blocks 721 at the position opposite to the opening 524 are inserted into the position of the opening 524 to close the opening 524 under the influence of the reset spring 730.

[0044] In one embodiment, the annular limiting member includes a first fixed ring 711, a second fixed ring 712, a second fixed rod 713 and a first limiting plate 714, the first fixed ring 711 is coaxially provided with two, and the interval between the two first fixed rings 711 constitutes a first clamping groove 715, the second fixed ring 712 is provided with an arc-shaped structure in cross section, the two ends of the second fixed ring 712 are respectively connected to the outer surfaces of the other first fixed rings 711, the surface of the second fixed ring 712 is provided with a second clamping groove 716, the second clamping groove 716 separates the second fixed ring 712 into a plurality of parts that are not connected to each other, the second fixed rod 713 is provided with a plurality of annular arrays, one end of which is fixed to the inner surface of the second fixed ring 712, and the other end is directed to the central axis of the first fixed ring 711, the first limiting plate 714 is provided with a plurality of, and is respectively fixed to the end of the second fixed rod 713 directed to the central axis of the first fixed ring 711, and the first limiting plate 714 is located in the first clamping groove 715.

[0045] Specifically, the end of the top block 721 directed to the central axis of the first fixed ring 711 is provided with an arc surface 724, the arc surface 724 is located in the same curved surface profile range as the surface of the installation cavity 530, the other end of the top block 721 is provided with a third clamping groove 723, the first limiting plate 714 and the second fixed rod 713 are movably clamped in the third clamping groove 723, and the end of the top block 721 provided with the third clamping groove 723 is further provided with a second limiting plate 722.

[0046] In one embodiment, the first fixed rod 250 is provided through the middle of the chain link, the first fixed rod 250 is fixed to the chain link through two fastening bolts 260, the first connecting member 810 and the second connecting member 820 are further rotatably installed between the two first fixed plates 511 and the second fixed plate 521, the first connecting member 810 and the second connecting member 820 can be rotatable to each other, and one end of the first connecting member 810 and the second connecting member 820 is movably sleeved on the first fixed rod 250.

[0047] Specifically, when the fixed frame 210 moves to the bending position in the chain tool store 200, the distance between the fixed frame 210 at the bending position and the chain link will change due to the mutual rotation connection of the adjacent fixed frames 210. At this time, the first connecting piece 810 and the second connecting piece 820 sleeved on one end of the first fixed rod 250 will move along the first fixed rod 250, thereby forming a cross-shaped structure to provide redundant space for the fixed frame 210.

[0048] As shown in Figure 6 and Figure 7 In one embodiment, a first mounting hole 513 is formed in the first fixed plate 511, a second mounting hole 523 is formed in the second fixed plate 521, the first connecting piece 810 includes a first mounting rod 811, a third fixed tube 812, a first arc-shaped plate 813, a first connecting plate 814, a third fixed rod 815, a second connecting plate 816, and a first limiting spring 817, the first mounting rod 811 is rotatably installed in a group of coaxially arranged first mounting holes 513 and second mounting holes 523, the third fixed tube 812 is provided with two and is sleeved on both ends of the first mounting rod 811, the first arc-shaped plate 813 is provided with two and is abutted on one side of the first fixed rod 250 away from the first mounting rod 811, the third fixed tube 812 and the first arc-shaped plate 813 are connected through two symmetrically arranged first connecting plates 814, the third fixed tube 812 is provided with the third fixed rod 815, the third fixed rod 815 is sleeved with the first limiting spring 817, and one end of the first limiting spring 817 towards the first fixed rod 250 is connected with the second connecting plate 816. The second connecting piece 820 includes a second mounting rod 821, a fourth fixed tube 822, a second arc-shaped plate 823, a third connecting plate 824, a fourth fixed rod 825, a fourth connecting plate 826, and a second limiting spring 827, the second mounting rod 821 is rotatably installed in another group of coaxially arranged first mounting holes 513 and second mounting holes 523, the fourth fixed tube 822 is provided with two and is sleeved on both ends of the second mounting rod 821, the second arc-shaped plate 823 is provided with two and is abutted on one side of the first fixed rod 250 away from the second mounting rod 821, the fourth fixed tube 822 and the second arc-shaped plate 823 are connected through two symmetrically arranged third connecting plates 824, the fourth fixed tube 822 is provided with the fourth fixed rod 825, the fourth fixed rod 825 is sleeved with the second limiting spring 827, and one end of the second limiting spring 827 towards the first fixed rod 250 is connected with the fourth connecting plate 826.

[0049] In one embodiment, a working method of an incrementally expanded self-feeding central tool store, applied to the incrementally expanded self-feeding central tool store of any of the above embodiments, includes the following steps:

[0050] Before the tool changing, the chain tool magazine is started and the chain is driven to move the fixed seat loaded with the required tool to the tool changing position.

[0051] Subsequently, a structure or substance for reducing friction is added in the installation cavity between the first positioning pipe and the second positioning pipe, and then the knob is screwed to cover the opening, at which time the inner surface of the knob protrudes and fills the opening.

[0052] During the tool changing, the fixed seat loaded with the required tool rotates on the fixed frame to make the tool face the tool changing mechanism for subsequent tool changing.

[0053] The above incremental expansion of the working method of the self-conveying central tool magazine, before the tool changing, the chain tool magazine is started and the chain is driven to move the fixed seat loaded with the required tool to the tool changing position, subsequently, a structure or substance for reducing friction is added in the installation cavity between the first positioning pipe and the second positioning pipe, and then the knob is screwed to cover the opening, at which time the inner surface of the knob protrudes and fills the opening, the structure of the first positioning pipe and the second positioning pipe rotatingly connected avoids the shaking of the chain in the vertical direction during the operation of the chain, reduces the wear of the chain during the transmission process, improves the transmission stability of the chain and the positioning accuracy of the tool, and simultaneously, since the lubricating member and the lubricant inside the installation cavity can be filled and removed, and the opening of the installation cavity can be opened and closed by rotating the knob, it is more convenient to maintain and replace the filled lubricating member or lubricant during the tool changing, during the tool changing, the fixed seat loaded with the required tool rotates on the fixed frame to make the tool face the tool changing mechanism for subsequent tool changing.

[0054] The technical features of the above-described embodiments can be combined in any manner, and to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0055] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present patent should be subject to the appended claims.

Claims

1. An incremental expansion self-conveying central tool magazine, characterized in that: include: The chain tool magazine is arranged in a spiral shape on a plane, thereby increasing the length and capacity of the chain tool magazine; A fixing frame is located outside the chain of the chain tool magazine and is directly opposite to the chain links of the chain. The fixing frame is used to set a fixing seat to load the tool; a first positioning tube and a second positioning tube, wherein the first positioning tube is fixed to one side of the back of the fixing frame, and the second positioning tube is fixed to the other side of the back of the fixing frame, and the first positioning tube on the back of one fixing frame is rotatably connected to the second positioning tube on the back of an adjacent fixing frame; An installation cavity is provided at the joint between the first positioning tube and the second positioning tube, and the installation cavity is used to add a friction-reducing structure or substance. An opening is provided at one end of the first positioning tube that is affixed to the second positioning tube, and the friction-reducing structure or substance is added to the installation cavity through the opening. The knob is rotatably mounted on the second positioning tube, and when the knob is rotated to cover the opening, the inner surface of the knob protrudes and fills the opening.

2. The incremental expansion self-conveying central tool magazine according to claim 1 is characterized in that: The chain tool magazine is fixed on a plane on one side of the machine tool, and a three-coordinate adjustment member is provided on another adjacent side of the machine tool. A tool changing mechanism is installed on the adjustment end of the three-coordinate adjustment member for changing the tools in the chain tool magazine.

3. The incremental expansion self-conveying central tool magazine according to claim 2, characterized in that: The first positioning tube member includes a first fixing plate and a first fixing tube. Two first fixing plates are provided on the back of the fixing frame. The first fixing tube is fixed to one side of the first fixing plate. The second positioning tube member includes a second fixing plate and a second fixing tube. The second fixing plate is provided on the back of the fixing frame and is located between the two first fixing plates. The second fixing tube is located on the other side of the second fixing plate. The coaxially arranged first fixing tube and the second fixing tube are rotatably connected by a pin shaft.

4. The incremental expansion self-conveying central tool magazine according to claim 3 is characterized in that: The knob component includes an annular limit member, a top block and a return spring. The inner surface of the annular limit member is provided with a first groove arranged in an annular structure. The annular limit member is threadedly installed on the first fixed pipe member. A plurality of top blocks are arranged in an annular array, and the bottom ends of the plurality of top blocks are located in the annular limit member and are elastically connected to the central axis of the annular limit member through a plurality of return springs.

5. The incremental expansion self-conveying central tool magazine according to claim 4, characterized in that: The annular limiter includes a first fixing ring, a second fixing ring, a second fixing rod and a first limiting plate. Two first fixing rings are coaxially arranged, and the interval between the two first fixing rings constitutes the first clamping groove. The cross-section of the second fixing ring is arranged in an arc-shaped structure. The two ends of the second fixing ring are respectively connected to the outer surface of the other first fixing ring. A plurality of second fixing rods are arranged in an annular array, and one end is fixed to the inner surface of the second fixing ring, and the other end faces the central axis of the first fixing ring. A plurality of first limiting plates are provided, and are respectively fixed to one end of the second fixing rod facing the central axis of the first fixing ring, and the first limiting plate is located in the first clamping groove.

6. The incremental expansion self-conveying central tool magazine according to claim 5, characterized in that: An arcuate surface is provided at one end of the top block facing the central axis of the first fixing ring, and the arcuate surface and the surface of the mounting cavity are located within the same curved surface contour range. A third slot is provided at the other end of the top block, and the first limiting plate and the second fixing rod are both movably engaged in the third slot. A second limiting plate is also provided at the end of the top block where the third slot is provided.

7. The incremental expansion self-conveying central tool magazine according to claim 6, characterized in that: A first fixing rod is provided through the middle of the chain link, and the first fixing rod is fixed to the chain link by two fastening bolts. A first connecting member and a second connecting member are rotatably installed between the two first fixing plates and one second fixing plate. The first connecting member and the second connecting member can rotate toward each other, and one end of the first connecting member and the second connecting member are movably sleeved on the first fixing rod.

8. The incremental expansion self-conveying central tool magazine according to claim 7, characterized in that: The first fixing plate is provided with a first mounting hole, and the second fixing plate is provided with a second mounting hole, and the first connecting member includes a first mounting rod, a third fixing tube, a first curved plate, a first connecting plate, a third fixing rod, a second connecting plate and a first limiting spring, and the first mounting rod is rotatably mounted in a group of coaxially arranged first mounting holes and second mounting holes, the third fixing tube is provided with two and respectively sleeved on both ends of the first mounting rod, the first curved plate is provided with two and respectively fitted on one side of the first fixing rod away from the first mounting rod, the third fixing tube and the first curved plate are connected by two symmetrically arranged first connecting plates, the third fixing tube is provided with a third fixing rod, the third fixing rod is sleeved with a first limiting spring, and the first limiting spring is connected to the second connecting plate toward one end of the first fixing rod.

9. The incremental expansion self-conveying central tool magazine according to claim 8, characterized in that: The second connecting member includes a second mounting rod, a fourth fixing tube, a second curved plate, a third connecting plate, a fourth fixing rod, a fourth connecting plate and a second limiting spring, the second mounting rod being rotatably mounted in another group of coaxially arranged first mounting holes and second mounting holes, the fourth fixing tube is provided with two and respectively sleeved on both ends of the second mounting rod, the second curved plate is provided with two and respectively fitted on one side of the first fixing rod away from the second mounting rod, the fourth fixing tube and the second curved plate are connected by two symmetrically arranged third connecting plates, the fourth fixing tube is provided with a fourth fixing rod, the fourth fixing rod is sleeved with a second limiting spring, and the second limiting spring is connected to the fourth connecting plate at one end facing the first fixing rod.

10. A working method of an incremental expansion self-conveying central tool magazine, applied to the incremental expansion self-conveying central tool magazine according to any one of claims 1 to 9, characterized in that: The method comprises: Before changing the tool, start the chain tool magazine and drive the chain to move the fixed seat loaded with the required tool to the tool changing position; Then, a structure or material for reducing friction is added to the installation cavity between the first positioning tube and the second positioning tube, and then the knob is turned until it covers the opening, at which time the inner surface of the knob protrudes and fills the opening; When changing the tool, the fixed seat loaded with the required tool rotates on the fixed frame so that the tool faces the tool changing mechanism for subsequent tool changing.

Images