A spiral internal broaching machine

Abstract

The present invention discloses a spiral internal broaching machine, comprising: a broaching machine main body, with a lower tool holder for clamping a tool provided at the lower part, the tool holder being connected with a first driving member for driving the tool to rotate around its own vertical central axis, and the broaching machine main body being provided with two vertically extending guide rods; a workbench for supporting and fixing a workpiece and vertically aligning the workpiece with the lower tool holder, the workbench being provided with two sliding holes respectively in sliding fit with the two guide rods; two second driving members, both connected with the workbench, for applying a vertical driving force to the workbench to enable it to slide vertically along the guide rods; wherein, the two guide rods and the two second driving members are both symmetrically arranged relative to the rotation central axis of the tool, and the central axes of the two guide rods, the rotation central axis of the tool, and the two force-receiving centers of the workbench corresponding to the two second driving members are all coplanar. The present invention has the advantages of high machining accuracy and high stability.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool equipment, in particular to a spiral internal broaching machine. Background Art

[0002] The spiral internal broaching machines in the prior art all use dovetail guide rails with flat and inclined guide plates. During processing, there is an irreversible force arm between the driving force, the supporting guide rail, and the processing force point, which is called the overturning force arm. Due to the structural reasons of the equipment itself, the workpiece being processed is also subjected to the overturning force arm of the equipment itself during actual processing. While the workpiece overcomes its own deformation during processing, it is also affected by the deformation of the equipment, thereby reducing the processing accuracy and stability. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a spiral internal broaching machine with high processing accuracy and stability.

[0004] According to an embodiment of the present invention, the spiral internal broaching machine includes: a broaching machine body, a lower tool clamp for clamping a tool is provided at the lower part, the lower tool clamp is connected to a first driving member for driving the tool to rotate around its own vertical center axis, and the broaching machine body is provided with two vertically extending guide rods; a workbench, used to support and fix a workpiece and align the workpiece vertically with the lower tool clamp, the workbench is provided with two sliding holes respectively matching with the two guide rods for sliding; two second driving members, both connected to the workbench, are used to apply a vertical driving force to the workbench so that it slides vertically along the guide rods; wherein the two guide rods and the two second driving members are symmetrically arranged relative to the rotation center axis of the tool, and the center axes of the two guide rods, the rotation center axis of the tool, and the two force centers of the workbench corresponding to the two second driving members are all coplanar.

[0005] The spiral internal broaching machine according to the embodiment of the present invention has at least the following beneficial effects:

[0006] Two second driving members are arranged to drive the workbench to rise and fall, two guide rods are arranged to guide the workbench, and the two second driving members are symmetrically arranged relative to the rotation center axis of the tool, and the two guide rods are symmetrically arranged relative to the rotation center axis of the tool, and the center axes of the two guide rods, the rotation center axis of the tool (corresponding to the workpiece processing force center), and the two force centers of the workbench corresponding to the two second driving members are all coplanar, thereby forming a highly symmetrical layout with five centers coplanar, so that during processing, the guide rods on two opposite sides of the workpiece processing force center and the force arm formed between the second driving member and the workpiece processing force center offset each other, thereby greatly reducing the discrete rate during broaching and improving the processing accuracy and stability of the workpiece.

[0007] According to some embodiments of the present invention, a tool lifting device is provided on the upper part of the broaching machine body, and the tool lifting device includes an upper tool clamp and a third driving member. The third driving member is used to drive the upper tool clamp to move vertically. The upper tool clamp can clamp the top of the tool and drive its vertical movement. Both the lower tool clamp and the upper tool clamp can release the tool.

[0008] According to some embodiments of the present invention, a clamping device and a transfer assembly are provided on the workbench, the clamping device includes a fourth driving member and a clamping member connected to its output end, the transfer assembly is used to place the workpiece, and is provided with a positioning structure for laterally positioning the workpiece, the transfer assembly can be slidably arranged on the workbench, and is connected to a fifth driving member for driving it to slide back and forth, the transfer assembly can receive the workpiece at the front and back sides of the clamping device; wherein, the transfer assembly can slide to the lower side of the clamping device and vertically align the clamping member with the workpiece, and at the same time, the fourth driving member can drive the clamping member to move vertically to clamp or release the workpiece.

[0009] According to some embodiments of the present invention, the transfer assembly includes a transfer frame and a support seat that can slide synchronously, the transfer frame is connected to the output end of the fifth driving member, the support seat can be detachably arranged on the transfer frame, the support seat is used to support the workpiece, and the positioning structure is arranged on the support seat.

[0010] According to some embodiments of the present invention, the workbench is provided with a support base plate extending forward and backward, the support base plate is provided with a first guide rail extending forward and backward, the lower surface of the support seat is attached to the upper surface of the support base plate, and is provided with a directional groove cooperating with the first guide rail, the transfer frame is provided with a limit plate for limiting the position against the upper end of the support seat, the transfer frame is provided with tightening screws on both sides of the front and rear of the support seat, the two tightening screws are threadedly penetrated into the transfer frame along the front and rear direction, and are respectively used to abut against the front and rear ends of the support seat.

[0011] According to some embodiments of the present invention, the transfer frame is provided with a connecting rod, a connecting frame, and two push plates, the connecting rod and the connecting frame are respectively arranged on the front and rear sides of the support seat, and are both equipped with the limit plate and the tightening screw, the two push plates are spaced apart on the left and right, the two ends of the connecting rod are respectively connected to the ends of the two push plates, one end of the connecting frame is rotatably connected to the middle part of one of the push plates, and the rotation center axis extends forward and backward, and the other end is locked to the middle part of the other push plate by a first locking mechanism, and the first locking mechanism can elastically move to release the lock of the connecting frame, so that the connecting frame can rotate to avoid the front and rear sliding path of the support seat.

[0012] According to some embodiments of the present invention, the transfer assembly has a first assembly state and a second assembly state. When in the first assembly state, the connecting rod can be detachably connected to the front ends of the two push plates. When in the second assembly state, the connecting rod can be detachably connected to the rear ends of the two push plates. When the transfer assembly is in the first assembly state or the second assembly state, the support seat is installed and limited to be between the connecting rod and the connecting frame.

[0013] According to some embodiments of the present invention, a first conical surface is provided at the end of the tool, an annular groove is provided at the neck of the tool, and a second conical surface is provided at one end of the annular groove close to the first conical surface, and the lower tool clamp comprises: a main clamping tool body, a mounting hole for mounting the tool is provided at the center; at least one group of jaws, a group of the jaws comprises two jaws symmetrically arranged relative to the central axis of the mounting hole, the jaws can be radially adjusted along the mounting hole and penetrated through the main clamping tool body, and a third conical surface for fitting with the second conical surface is provided at one end facing the mounting hole; a positioning cone sleeve is installed in the mounting hole, and an inwardly narrowed conical hole is provided on the end face facing the jaw, and the conical hole wall is used to fit with the first conical surface; wherein the jaws can be radially adjusted along the mounting hole to make the third conical surface close to the second conical surface, and the first conical surface remains close to the conical hole wall, so as to limit the tool axially and radially.

[0014] According to some embodiments of the present invention, the lower tool clamp also includes an elastic mechanism and a driving mechanism, wherein the elastic mechanism is used to apply an elastic force radially outward along the mounting hole to the clamping claw, and the driving mechanism is used to drive the clamping claw to move radially inward along the mounting hole, and can cooperate with the elastic mechanism to achieve radial position adjustment of the clamping claw along the mounting hole.

[0015] According to some embodiments of the present invention, a fourth conical surface is provided at one end of the clamping claw away from the mounting hole, the driving mechanism includes a sliding sleeve slidably mounted on the outside of the main clamping tool body and a sixth driving member for driving the sliding sleeve to slide, and a fifth conical surface is provided on the inner wall of the sliding sleeve, and the fifth conical surface cooperates with the fourth conical surfaces of all the clamping claws.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 2 is a schematic structural diagram of a spiral internal broaching machine according to an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a workbench according to an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a transfer assembly according to an embodiment of the present invention in a first assembly state;

[0021] Figure 4 is a schematic structural diagram of a transfer assembly according to an embodiment of the present invention in a second assembly state;

[0022] Figure 5 is an exploded schematic diagram of a transfer assembly according to an embodiment of the present invention in a first assembly state;

[0023] Figure 6 is a schematic structural diagram of a pressing member according to an embodiment of the present invention;

[0024] Figure 7 is a cross-sectional schematic diagram of a pressing member according to an embodiment of the present invention;

[0025] Figure 8 is an exploded schematic diagram of a pressure ring and a slide plate according to an embodiment of the present invention;

[0026] Fig. 9 is a schematic structural diagram of the lower knife clamp of an embodiment of the present invention when clamping;

[0027] Fig.10 is an exploded schematic diagram of a lower tool holder according to an embodiment of the present invention;

[0028] Fig.11 Schematic diagram of the structure of a tool according to an embodiment of the present invention.

[0029] Figure Number:

[0030] The broaching machine body 100, the tool 101, the first conical surface 1011, the annular groove 1012, the second conical surface 1013, the guide rod 110, the tool carrying device 120, the upper tool holder 121, the third driving member 122, the upper slide plate 123, and the protective cabinet 130;

[0031] Lower tool holder 200, first driving member 201, main tool holder body 210, mounting hole 211, guide hole 212, avoidance groove 213, step surface 214, threaded hole 215, locking screw 216, annular groove 217, anti-loosening wire 218, claw 220, third cone surface 221, fourth cone surface 222, positioning cone sleeve 230, cone hole 231, elastic mechanism 240, connecting pin 241, spring 242, driving mechanism 250, sliding sleeve 251, sixth driving member 252, fifth cone surface 253, shift fork 254, locking block 260;

[0032] Workbench 300, sliding hole 301, supporting bottom plate 310, first guide rail 311, connecting seat 320, connecting hole 321;

[0033] A second driving member 400;

[0034] The clamping device 500, the fourth driving member 510, the clamping member 520, the pressing ring 530, the flange 531, the water passage 532, the pressing plate 540, the locking block 541, the second guide rail 550, the slide plate 560, the embedded groove 561, the through hole 562, the locking seat 563, the abutting member 570, the water passage 571, the water inlet pipe 572, the limiting member 580, the second locking mechanism 590, the limiting plunger 591, the locking rod 592, the locking head 593, the locking hole 594, and the locking nut 595;

[0035] Transfer assembly 600, positioning structure 601, transfer frame 610, connecting rod 611, connecting frame 612, plug hole 6121, mounting position 6122, push plate 613, support seat 620, orientation groove 621, matching surface 622, limit plate 630, tightening screw 640, first locking mechanism 650;

[0036] The fifth driving member 700 .

[0037] Water storage cover 800, water storage chamber 801, water outlet gap 802. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0041] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0042] Reference Figure 1 and Figure 2 As shown, a spiral internal broaching machine according to an embodiment of the present invention includes: a broaching machine body 100 , a workbench 300 , and two second driving members 400 .

[0043] A lower tool holder 200 for clamping the tool 101 is provided at the lower part of the broaching machine body 100. The tool 101 is in a vertical state after being clamped on the lower tool holder 200. The lower tool holder 200 is connected to a first driving member 201 for driving the tool 101 to rotate around its own vertical central axis. The broaching machine body 100 is provided with two vertically extending guide rods 110.

[0044] The workbench 300 is used to support and fix the workpiece and vertically align the workpiece with the lower tool holder 200 . The workbench 300 is provided with two sliding holes 301 which are respectively slidably matched with the two guide rods 110 .

[0045] The two second driving members 400 are both connected to the workbench 300, and are used to apply a vertical driving force to the workbench 300 so that it slides vertically along the guide rod 110, thereby driving the workpiece to move vertically, and cooperating with the first driving member 201 to drive the tool 101 to rotate, so as to realize the internal spiral drawing of the workpiece. It should be noted that the two second driving members 400 work synchronously; in addition, it can be understood that there are holes on the workbench 300 to avoid the tool 101 for its passage.

[0046] Among them, the two guide rods 110 are symmetrically arranged relative to the rotation center axis of the tool 101, and the two second driving members 400 are also symmetrically arranged relative to the rotation center axis of the tool 101, and the center axes of the two guide rods 110, the rotation center axis of the tool 101 (corresponding to the workpiece processing force center), and the two force centers of the workbench 300 corresponding to the two second driving members 400 are all coplanar, forming a highly symmetrical layout with five centers coplanar. During processing, the guide rods 110 on two opposite sides of the workpiece processing force center and the force arms formed between the second driving member 400 and the workpiece processing force center can offset each other, thereby eliminating the instability factor caused by the overturning torque.

[0047] The spiral internal broaching machine of the embodiment of the present invention drives the worktable 300 to rise and fall by arranging two second driving members 400, arranging two guide rods 110 to guide the worktable 300, and symmetrically arranging the two second driving members 400 relative to the rotation center axis of the tool 101, symmetrically arranging the two guide rods 110 relative to the rotation center axis of the tool 101, and symmetrically arranging the center axes of the two guide rods 110, the rotation center axis of the tool 101 (corresponding to the workpiece processing force center), and the two force centers of the worktable 300 corresponding to the two second driving members 400 are all coplanar, thereby forming a highly symmetrical layout with five centers coplanar, so that during processing, the guide rods 110 on two opposite sides of the workpiece processing force center and the force arms formed between the second driving member 400 and the workpiece processing force center offset each other, thereby greatly reducing the discrete rate during broaching and improving the processing accuracy and stability of the workpiece.

[0048] In some specific embodiments, Figure 1 and Figure 2 As shown, the second driving member 400 adopts a heavy-loaded ball screw pair and a servo motor. The nut of the heavy-loaded ball screw pair is installed on the workbench 300. The two screws of the two heavy-loaded ball screw pairs, the rotation center axis of the tool 101, and the center axis of the two guide rods 110 are coplanar. Two connecting seats 320 are provided on the workbench 300. The connecting seats 320 are provided with connecting holes 321 for installing the nuts of the heavy-loaded ball screw pair. It can be understood that the center axes of the two connecting holes 321, the center axis of the hole on the workbench 300 for the tool 101 to pass through, and the center axes of the two sliding holes 301 on the workbench 300 are coplanar.

[0049] Further, such as Figure 1 As shown, the broaching machine body 100 is provided with a protection cabinet 130 , and the workbench 300 and the two second driving members 400 are all located in the protection cabinet 130 .

[0050] Reference Figure 1 As shown, it can be understood that a tool lifting device 120 is provided on the upper part of the broaching machine body 100, and the tool lifting device 120 includes an upper tool clamp 121 and a third driving member 122, and the third driving member 122 is used to drive the upper tool clamp 121 to move vertically, and the upper tool clamp 121 can clamp the top of the tool 101 and drive its vertical movement, and the lower tool clamp 200 is vertically aligned with the upper tool clamp 121, and the lower tool clamp 200 and the upper tool clamp 121 can clamp or release the tool 101. Specifically, the upper tool clamp 121 is installed on the upper slide 123, and the upper slide 123 is connected to the output end of the third driving member 122, and the upper slide 123 is slidably matched with the guide rod 110. It can be understood that the third driving member 122 can adopt a driving component such as the patent with application number CN203010920635.9, or other driving forms in the prior art, which will not be repeated here.

[0051] Specifically, the workflow of this embodiment is as follows:

[0052] Before processing, the upper tool clamp 121 moves to the highest position, the workbench 300 moves to the lowest height, and the loading is completed, so that the tool 101 is clamped in the upper tool clamp 121, and then the third driving member 122 is used to drive the upper tool clamp 121 to move downward, pass through the workpiece on the workbench 300 (the tool handle passes through) and insert into the lower tool clamp 200, and then the lower tool clamp 200 holds the bottom end of the tool 101, and then processing begins.

[0053] During processing, the first driving member 201 drives the tool 101 to rotate, and at the same time the second driving member 400 drives the worktable 300 to rise to perform spiral broaching on the workpiece. When the worktable 300 rises to about to touch the upper tool clamp 121, the third driving member 122 drives the upper tool clamp 121 to move upward to avoid it, and the worktable 300 continues to rise until it moves to the upper side of the tool 101 to complete the processing.

[0054] After processing, the workpiece is unloaded. After unloading, the workbench 300 is moved down and reset, the upper tool clamp 121 clamps the tool 101 again, and the lower tool clamp 200 releases the tool 101, and the lower tool clamp 200 drives the tool 101 to move up and reset, waiting for the next processing cycle.

[0055] It is understandable that during broaching, the workpiece needs to move from bottom to top relative to the tool 101. If the tool 101 is directly clamped by the lower tool 101, it is inconvenient to load the material. After the tool lifting device 120 is set, the workbench 300 can be moved to the lowest position. The tool 101 is first clamped by the upper tool clamp 121, and the tool 101 is located on the upper side of the workbench 300. Then the material is loaded, and then the lower tool clamp 200 is moved down so that the shank of the tool 101 passes through the workpiece and is inserted into the lower tool clamp 200, and is clamped by the lower tool clamp 200. Then the tool 101 is rotated, and at the same time the workbench 300 drives the workpiece to move upward for spiral broaching, which is convenient for loading.

[0056] Reference Figures 2 to 4 As shown, it can be understood that a clamping device 500 and a transfer assembly 600 are provided on the workbench 300, the clamping device 500 is provided on the upper side of the workbench 300, and the clamping device 500 includes a fourth driving member 510 and a clamping member 520 connected to its output end, and specifically, the fourth driving member 510 is used to drive the clamping member 520 to rise and fall. It is conceivable that the fourth driving member 510 can be a cylinder or an oil cylinder.

[0057] The transfer assembly 600 is used to place the workpiece. The transfer assembly 600 is provided with a positioning structure 601 for lateral positioning of the workpiece to prevent the workpiece from moving laterally. The transfer assembly 600 can be slidably arranged on the workbench 300 and connected to a fifth driving member 700 for driving it to slide forward and backward to transport the workpiece. The transfer assembly 600 can receive the workpiece on both the front and rear sides of the clamping device 500, that is, it can load and unload materials from both ends. It is understandable that an automated device can be set on one side of the front and rear sides of the clamping device 500 for automatic loading and unloading, and the other side is used for manual loading and unloading. When the automated device is damaged and repaired, it can be manually loaded and unloaded from the other side to improve production efficiency and avoid its reduction. It is conceivable that the fifth driving member 700 can be a rodless cylinder assembly or a motor screw assembly.

[0058] It should be noted that the positioning structure 601 needs to match the workpiece setting. For example, when processing an annular workpiece, the positioning structure 601 can be a plurality of positioning columns arranged in a circle. The positioning structure 601 can have a variety of settings, which are not described here one by one.

[0059] Among them, the transfer assembly 600 can slide to the lower side of the clamping device 500 and align the clamping member 520 vertically with the workpiece. At the same time, the fourth driving member 510 can drive the clamping member 520 to move vertically to clamp or loosen the workpiece. The clamping member 520 clamps the workpiece to limit the vertical jump of the workpiece and prevent it from rotating, thereby improving the processing accuracy. It is obvious that the workbench 300, the clamping member 520 and the transfer assembly 600 are all provided with holes for the tool 101 to pass vertically to avoid interference.

[0060] It can be understood that by arranging the transfer assembly 600 and the clamping device 500 on the workbench 300, the transfer assembly 600 can place and transport the workpiece to the lower side of the clamping device 500, and the clamping device 500 can clamp the workpiece, thereby preventing the workpiece from moving during processing to improve processing accuracy. In addition, the transfer assembly 600 can receive the workpiece on both the front and rear sides of the clamping device 500, so that when the automatic loading and unloading equipment on one side is maintained, manual loading and unloading can be carried out from the other side, thereby avoiding line stoppage and improving production efficiency.

[0061] It is foreseeable that a sensing component is provided between the workbench 300 and the transfer component 600, which is used to sense the position of the transfer component 600, and control the fifth driving member 700 to stop driving through the controller, so that the transfer component 600 can stop in the corresponding area (processing area or loading and unloading area). The sensing component can have a variety of structural forms, such as the use of a sensing block and a sensing switch, which is a common structure in the prior art and is not described here. In addition, in order to make the transfer component 600 stop smoothly, a buffer device can also be provided to buffer the transfer component 600, such as the cooperation of a buffer and a buffer block, and can also be other forms, which is a common structure in the prior art and is not described here.

[0062] Reference Figures 2 to 4 As shown, it can be understood that the transfer assembly 600 includes a transfer frame 610 and a support seat 620 that can slide synchronously, the transfer frame 610 is connected to the output end of the fifth driving member 700, and the support seat 620 can be detachably arranged on the transfer frame 610, the support seat 620 is used to support the workpiece, and the positioning structure 601 is arranged on the support seat 620. By dividing the transfer assembly 600 into two parts, the support seat 620 is used to support the workpiece, so that when different workpieces need to be processed, it is only necessary to replace the support seat 620, and there is no need to replace the entire transfer assembly 600. The operation is simpler, thereby reducing the line stop time.

[0063] Reference Figure 2 , Figure 3 and Figure 5 As shown, it can be understood that the workbench 300 is provided with a supporting base plate 310 extending forward and backward, and a first guide rail 311 extending forward and backward is provided on the supporting base plate 310. The lower surface of the support seat 620 is attached to the upper surface of the supporting base plate 310, and the support base plate 310 supports the limiting support seat 620. The support seat 620 is also provided with an orientation groove 621 that cooperates with the first guide rail 311. Specifically, the cross-sectional shape and size of the first guide rail 311 and the orientation groove 621 match, and both are square. The first guide rail 311 is embedded in the orientation groove 621, and the orientation groove 621 is used to limit the left and right displacement of the support seat 620 and to limit its For forward and backward sliding guidance; a limit plate 630 is provided on the transfer frame 610 for limiting the position against the upper end of the support seat 620, so as to cooperate with the support base plate 310 to vertically limit the support seat 620, and the transfer frame 610 is provided with tightening screws 640 on both sides of the front and rear of the support seat 620, and the two tightening screws 640 are threadedly penetrated into the transfer frame 610 along the front and rear directions, and the two tightening screws 640 are respectively used to abut against the front and rear ends of the support seat 620 to limit the forward and backward displacement of the support seat 620, so that the support seat 620 can be relatively fixed to the transfer frame 610, so that the two can slide synchronously, and the structure is simple and practical.

[0064] Reference Figure 2 As shown, holes for the tool 101 to pass through are provided on the support base plate 310 and the workbench 300 , and the first guide rail 311 is interrupted at the hole of the support base plate 310 for the tool 101 to pass through to avoid interference.

[0065] Reference Figure 3 and Figure 5As shown, it can be understood that the transfer frame 610 is provided with a connecting rod 611, a connecting frame 612, and two push plates 613. The connecting rod 611 and the connecting frame 612 are respectively arranged on the front and rear sides of the support seat 620, and the connecting rod 611 and the connecting frame 612 are both installed with a limit plate 630 and a tightening screw 640. Specifically, in this embodiment, two limit plates 630 are also provided, which are respectively installed on the connecting rod 611 and the connecting frame 612 by screws to improve the limiting effect. In addition, vertical matching surfaces 622 are provided at both ends of the support seat 620 for abutting against the tightening screw 640; the two push plates 613 are arranged at intervals on the left and right. Specifically, in this embodiment, two fifth driving members 700 are arranged at intervals on the left and right, and the two push plates 613 are respectively connected to the output ends of the two fifth driving members 700; further, the two ends of the connecting rod 611 are respectively connected to the ends of the two push plates 613, One end of the connecting frame 612 is rotatably connected to the middle part of one of the pushing plates 613, and the central axis of rotation extends forward and backward, that is, the central axis of rotation is in the same extension direction as the first guide rail 311. In addition, the other end of the connecting frame 612 is locked to the middle part of the other pushing plate 613 through the first locking mechanism 650. The first locking mechanism 650 can be elastically movable to release the lock on the connecting frame 612, so that the connecting frame 612 can be rotated to avoid the front and rear sliding path of the support seat 620. It can be understood that when the support seat 620 needs to be replaced, the first locking mechanism 650 can be elastically movable to release the lock on the connecting frame 612, and then the connecting frame 612 can be rotated to avoid the front and rear sliding path of the support seat 620, and then the support seat 620 can be slid along the first guide rail 311 to disengage the support seat 620 from the lower side of the limit plate 630 on the connecting rod 611, so that the support seat 620 can be taken out upward, and the operation is quick and convenient.

[0066] In some specific embodiments, the first locking mechanism 650 is a reset-type knob plunger, which can be elastically mounted on the push plate 613 and move forward and backward. One end of the connecting frame 612 is provided with a socket 6121 that passes through the front and back. The reset-type knob plunger is partially inserted into the socket 6121 to limit the rotation of the connecting frame 612. When the connecting frame 612 needs to be rotated, the reset-type knob plunger is pulled to disengage it from the socket 6121. The structure is simple and the operation is very convenient.

[0067] Reference Figures 3 to 5As shown, it can be understood that the transfer component 600 has a first assembly state and a second assembly state. When the transfer component 600 is in the first assembly state, the connecting rod 611 can be detachably connected to the front end of the two push plates 613. When the transfer component 600 is in the second assembly state, the connecting rod 611 can be detachably connected to the rear end of the two push plates 613, and when the transfer component 600 is in the first assembly state or the second assembly state, the support seat 620 is installed and limited between the connecting rod 611 and the connecting frame 612. Specifically, when the transfer component 600 is in the first assembly state and the second assembly state, the support seat 620 is respectively located on the front and rear sides of the connecting frame 612, that is, the support seat 620 in the second assembly state is moved back a distance relative to the support seat 620 in the first assembly state. The advantage of this arrangement is that the maximum driving stroke of the fifth drive member 700 can be made smaller to facilitate the overall layout.

[0068] It is understandable that if the transfer component 600 remains in one assembly state, then in order to meet the needs of loading and unloading materials at the rear side of the clamping member 520, the maximum driving stroke of the fifth driving member 700 must ensure that the support seat 620 can move to the rear side of the clamping member 520 to avoid interference with loading and unloading. In this embodiment, by switching between the two assembly states and changing the front and rear positions of the connecting rod 611 and the support seat 620, the driving stroke from directly below the clamping member 520 to the rear side of the clamping member 520 can be reduced.

[0069] Specifically, the connecting rod 611 is connected to the push plate 613 by fasteners, and corresponding connection holes are provided at the front and rear ends of the push plate 613. When the connecting rod 611 is installed at the front end of the push plate 613, it is symmetrical relative to when the connecting rod 611 is installed at the rear end of the push plate 613.

[0070] Further, such as Figure 3 and Figure 5 As shown, two mounting positions 6122 are symmetrically provided on the front and rear sides of the connecting frame 612, both of which can be used to install the limit plate 630 and tighten the screw 640. The two mounting positions 6122 are used when the transfer component 600 is in the first assembly state and the second assembly state, respectively, to limit the support seat 620. The two mounting positions 6122 are both provided with screw holes for installing the limit plate 630, and are welded with nuts for installing the tightening screw 640.

[0071] In some specific embodiments, reference Figure 2 , Figure 6 , Figure 7As shown, the clamping member 520 is provided with a pressing ring 530 and a pressing plate 540. The pressing ring 530 can be detachably arranged on the lower side of the pressing plate 540. The lower surface of the pressing ring 530 is used to abut against the workpiece. The pressing plate 540 is connected to the output end of the fourth driving member 510. By separately arranging the pressing ring 530 and the pressing plate 540, when different parts need to be processed, only the pressing ring 530 needs to be replaced, and there is no need to disassemble the pressing plate 540. The disassembly and assembly is more convenient and can also avoid damage to the fourth driving member 510 during disassembly and assembly.

[0072] In some specific embodiments, reference Figures 6 to 8 As shown, a second guide rail 550 fixedly connected to the pressure plate 540 is provided at the lower side thereof, and a slide plate 560 is provided on the second guide rail 550 so as to be able to slide back and forth, and a spacing is left between the slide plate 560 and the pressure plate 540, and an embedding groove 561 is provided on the upper surface of the slide plate 560, and a through hole 562 is provided on the bottom wall of the embedding groove 561, and a flange 531 is provided on the upper end of the pressure ring 530, and the pressure ring 530 is passed through the through hole 562 and the flange 531 is embedded in the embedding groove 561. Specifically, after the flange 531 is embedded in the embedding groove 561, the rotation and lateral displacement of the pressure ring 530 can be limited. It can be imagined that the flange 531 and the embedding groove 561 can be set in a square shape to limit the rotation of the pressure ring 530, or a vertical plane can be cut on the peripheral side of the flange 531, and a directional key can be installed in the embedding groove 561 to abut against this vertical plane to limit the rotation of the pressure ring 530, or some other forms can be used. Since such a structure is a common means in the prior art, it will not be described one by one here.

[0073] Further, the pressing plate 540 is provided with an abutting member 570 abutting against the upper end of the pressing ring 530 to limit the upward displacement of the pressing ring 530. The pressing plate 540 is also provided with a limiting member 580 abutting against the front end of the slide plate 560. A second locking mechanism 590 is provided between the pressing plate 540 and the slide plate 560, which is used to lock the slide plate 560 to limit its backward sliding relative to the second guide rail 550, thereby fixing the slide plate 560 relative to the pressing plate 540. In addition, the second locking mechanism 590 can release the lock of the slide plate 560, so that the slide plate 560 and the pressing ring 530 can slide to be separated from the second guide rail 550, so as to facilitate the replacement of the pressing ring 530. It should be noted that in this embodiment, the limiting member 580 is used to limit the sliding of the slide plate 560 forward, and the second locking mechanism 590 is used to limit the sliding of the slide plate 560 backward. In some other embodiments, the limiting member 580 and the second locking mechanism 590 can be interchanged to meet the limitation of the slide plate 560.

[0074] Specifically, Figure 6 and Figure 7As shown, the second locking mechanism 590 is provided with a limiting plunger 591 and a locking rod 592, a locking block 541 is provided at the lower end of the pressure plate 540, the limiting plunger 591 partially protrudes from the front end of the locking block 541, a locking seat 563 is provided at the rear end of the slide plate 560, the locking rod 592 can be movably inserted into the locking seat 563, a locking head 593 is provided at the front end of the locking rod 592, the locking head 593 is provided with a locking hole 594, the limiting plunger 591 is embedded in the locking hole 594, and the locking rod 592 is threadedly connected with a locking nut 595 for locking with the rear end of the lock seat 563 The ends are abutted against each other, and the locking head 593 is abutted against the locking block 541, and the limiting plunger 591 remains embedded in the locking hole 594 to limit the backward displacement of the slide plate 560. When the slide plate 560 needs to be removed, the locking nut 595 can be loosened and the locking rod 592 can be slid to separate the limiting plunger 591 from the locking hole 594. The locking rod 592 can then be rotated to make the locking head 593 avoid the extension path before and after the locking block 541, and the slide plate 560 can be slid out of the second guide rail 550. The structure is simple and the operation is convenient.

[0075] Further, such as Figure 6 and Figure 7 As shown, the pressing member 520 is provided with a cleaning structure for cleaning the lower surface of the pressing ring 530, so as to prevent the lower surface of the pressing ring 530 from being uneven and damaging the surface of the workpiece. The cleaning structure includes a water storage cover 800, which is connected to the peripheral side of the bottom end of the pressing ring 530 and forms a water storage cavity 801 between the pressing ring 530. A water outlet gap 802 is left between the inner side of the water storage cover 800 and the lower surface of the pressing ring 530 for water to flow out and clean the lower surface of the pressing ring 530. The upper surface of the pressing ring 530 is provided with a water outlet 802. A water passage 532 extends downward to the water storage chamber 801, a water groove 571 is provided on the lower surface of the abutment 570, the water groove 571 is closed on the upper surface of the pressure ring 530, the water groove 571 is communicated with the water passage 532, a water inlet pipe 572 is provided on the abutment 570, and the water inlet pipe 572 is connected to the water groove 571, so that cleaning liquid can be transported along the path of water inlet pipe 572-water groove 571-water passage 532-water storage chamber 801-water outlet gap 802 to clean the lower surface of the pressure ring 530.

[0076] Reference Figures 9 to 11 As shown, it can be understood that a first conical surface 1011 is provided at the end of the tool 101, an annular groove 1012 is provided at the neck of the tool 101, and a second conical surface 1013 is provided at one end of the annular groove 1012 close to the first conical surface 1011. The lower tool clamp 200 includes: a main clamping tool body 210, at least one set of claws 220, and a positioning cone sleeve 230.

[0077] The center of the main clamping tool body 210 is provided with a mounting hole 211 for mounting the tool 101. The inner diameter of the mounting hole 211 is the same as the outer diameter of the portion of the tool 101 inserted into the mounting hole 211. The end of the mounting hole 211 for inserting the tool 101 is provided with an internal spline for key connection with the tool 101. Obviously, the tool 101 is processed with an external spline to cooperate with the internal spline of the mounting hole 211. The torque is transmitted through the key connection. Compared with the traditional torque transmission, the connection is more stable and can transmit a larger torque. Specifically, the bottom end of the main clamping tool body 210 is connected to the output end of the first driving member 201. The first driving member 201 is installed on the main body 100 of the broaching machine. The first driving member 201 drives the main clamping tool body 210 to rotate to drive the tool 101 to rotate. The first driving member 201 can use a servo motor.

[0078] A group of claws 220 includes two claws 220, and the two claws 220 are symmetrically arranged relative to the central axis of the mounting hole 211. The claws 220 can be radially adjusted along the mounting hole 211 and penetrated in the main clamping tool body 210, and a third conical surface 221 for fitting with the second conical surface 1013 is provided at one end facing the mounting hole 211, that is, the second conical surface 1013 and the third conical surface 221 have the same taper; specifically, the peripheral wall of the mounting hole 211 is provided with guide holes 212, and the guide holes 212 penetrate radially outward from the mounting hole 211. The number of guide holes 212 is the same as the number of claws 220, and the claws 220 can be slidably installed in the guide holes 212 to adjust their positions. The third conical surface 221 is located on the side of the claw 220 away from the insertion end of the mounting hole 211. Obviously, the claw 220 can be adjusted to avoid the insertion path of the tool 101.

[0079] The positioning cone sleeve 230 is installed in the mounting hole 211. Specifically, the positioning cone sleeve 230 is located on the side of the insertion end of the claw 220 away from the mounting hole 211. The end face of the positioning cone sleeve 230 facing the claw 220 is provided with an inwardly narrowed conical hole 231. The taper of the wall of the conical hole 231 is the same as the taper of the first conical surface 1011, and is used to fit with the first conical surface 1011.

[0080] The clamping jaw 220 can be adjusted along the radial direction of the mounting hole 211 to make the third conical surface 221 close to the second conical surface 1013, and keep the first conical surface 1011 close to the wall of the conical hole 231, so as to axially and radially limit the tool 101. It can be understood that the clamping jaw 220 can be adjusted to avoid the extension path of the mounting hole 211, so as to facilitate the insertion or extraction of the tool 101.

[0081] Specifically, when the lower tool clamp 200 clamps the tool 101, the claw 220 is first adjusted to avoid the extension path of the mounting hole 211, and the shank of the tool 101 is inserted into the mounting hole 211, so that the first conical surface 1011 is in contact with the hole wall of the conical hole 231 of the positioning cone sleeve 230, and then the claw 220 is adjusted so that the third conical surface 221 of the claw 220 is in contact with the second conical surface 1013 of the tool 101, and at the same time, the first conical surface 1011 is in contact with the hole wall of the conical hole 231.

[0082] It is understandable that the present embodiment provides a clamping claw 220 and a positioning cone sleeve 230, and provides a third cone surface 221 and a cone hole 231, and utilizes the third cone surface 221 to be in close contact with the second cone surface 1013 of the tool 101, and the hole wall of the cone hole 231 to be in close contact with the first cone surface 1011, so as to eliminate the axial clearance and radial clearance of the tool 101, achieve its radial centering, prevent its axial or radial movement, and thus improve the broaching accuracy of the tool 101.

[0083] In some specific embodiments, the claws 220 are provided in two groups and are evenly distributed around the central axis of the mounting hole 211 .

[0084] Reference Fig. 9 and Fig.10 As shown, it can be understood that the lower tool clamp 200 also includes an elastic mechanism 240 and a driving mechanism 250. The elastic mechanism 240 is used to apply an elastic force radially outward along the mounting hole 211 to the claw 220, and the driving mechanism 250 is used to drive the claw 220 to move radially inward along the mounting hole 211. The driving mechanism 250 can cooperate with the elastic mechanism 240 to achieve radial position adjustment of the claw 220 along the mounting hole 211. Specifically, when it is necessary to clamp the tool 101, the driving mechanism 250 drives the claw 220 to move toward the mounting hole 211 until the third conical surface 221 is in close contact with the second conical surface 1013 of the tool 101, and the driving is stopped and the claw 220 is fixed. When it is necessary to remove the tool 101, the driving mechanism 250 releases the fixation of the claw 220, and uses the elastic force of the elastic mechanism 240 to make the claw 220 move away from the mounting hole 211. The above-mentioned settings can realize automatic adjustment of the position of the claw 220.

[0085] Specifically, an avoidance groove 213 is provided on the outer peripheral wall of the main clamping tool body 210 at one side of the clamping claw 220, and the avoidance groove 213 is connected to the guide hole 212. A plurality of elastic mechanisms 240 are provided corresponding to the clamping claw 220, and the number of elastic mechanisms 240 is the same as that of the clamping claw 220. The elastic mechanism 240 includes a connecting pin 241 and a spring 242. The connecting pin 241 is axially fixedly inserted into the clamping claw 220 along the mounting hole 211, and a part of the connecting pin 241 is located in the avoidance groove 213. One end of the spring 242 is against the inner groove wall of the avoidance groove 213, and the other end is connected to the connecting pin 241, which is used to apply an elastic force radially outward along the mounting hole 211 to the connecting pin 241, so that the clamping claw 220 can be driven to move radially outward along the mounting hole 211 through the spring 242. The connecting pin 241 can provide an installation and force application position for the spring 242, and the avoidance groove 213 provides space for the movement of the connecting pin 241. The structure is simple and practical.

[0086] Reference Fig. 9 and Fig.10 As shown, it can be understood that the end of the clamping claw 220 away from the mounting hole 211 is provided with a fourth conical surface 222, and the driving mechanism 250 includes a sliding sleeve 251 slidably mounted on the outside of the main clamping tool body 210 and a sixth driving member 252 for driving the sliding sleeve 251 to slide along the main clamping tool body 210. Obviously, the sliding direction of the sliding sleeve 251 is the same as the extending direction of the mounting hole 211. The inner wall of the sliding sleeve 251 is provided with a fifth conical surface 253, and the fifth conical surface 253 is aligned with the entire clamping claw 220. The fourth conical surface 222 fits closely, that is, the fifth conical surface 253 has the same taper as the fourth conical surface 222. It can be understood that the sixth driving member 252 drives the sleeve 251 to slide away from the tool 101, and the fifth conical surface 253 fits closely with the fourth conical surface 222, so that the claw 220 can be pushed to slide toward the mounting hole 211. If the claw 220 is to be retracted, the sixth driving member 252 drives the sleeve 251 to slide in the opposite direction. The structure is simple and easy to use. Specifically, the sleeve 251 is fixedly connected with a fork 254, which is used to connect the sixth driving member 252 to transmit force, and a lifting ring for lifting is provided on the fork 254. It can be imagined that the sixth driving member 252 can be an oil cylinder or an air cylinder, which is installed on the broaching machine body 100. In addition, in this embodiment, the sleeve 251 can rotate relative to the main clamping tool body 210.

[0087] In some specific embodiments, reference Fig. 9 and Fig.10As shown, the mounting hole 211 passes through the main clamping tool body 210, and the inner wall of the mounting hole 211 is stepped and formed with a step surface 214, the step surface 214 abuts against one end of the positioning cone sleeve 230 provided with a tapered hole 231, and the mounting hole 211 is internally threadedly connected to a locking block 260 abutting against the other end of the positioning cone sleeve 230, that is, the locking block 260 is provided with an external thread, and the mounting hole 211 is provided with an internal thread, and the positioning cone sleeve 230 is fixed by the step surface 214 and the locking block 260, so that the positioning cone sleeve 230 can be detachably installed in the mounting hole 211, the structure is simple, and the locking block 260 is convenient for disassembly and assembly.

[0088] In some specific embodiments, reference Fig. 9 and Fig.10 As shown, an adjusting washer is provided between the step surface 214 and the positioning cone sleeve 230, and the adjusting washer is used to compensate for the error of the axial distance between the positioning cone sleeve 230 and the claw 220 along the mounting hole 211, so that the third cone surface 221 can be close to the second cone surface 1013, and at the same time, the wall of the tapered hole 231 can be close to the first cone surface 1011.

[0089] In some specific embodiments, reference Fig. 9 and Fig.10 As shown, the peripheral wall of the main clamping tool body 210 is provided with a plurality of threaded holes 215 radially penetrating to the mounting hole 211, and the threaded holes 215 are internally threadedly connected with locking screws 216, and the inner end of the locking screw 216 abuts against the outer wall of the locking block 260 to prevent the locking block 260 from loosening, and the structure is more stable. It is understandable that in order to prevent the locking screw 216 from damaging the outer thread of the locking block 260, a copper pad is provided at the inner end of the locking screw 216. It should be noted that the inner end of the locking screw 216 is the end thereof facing the mounting hole 211.

[0090] Further, see Fig. 9 and Fig.10 As shown, the peripheral wall of the main clamping tool body 210 is provided with an annular groove 217, which intersects with multiple threaded holes 215. An anti-loosening wire 218 is provided in the annular groove 217, and the anti-loosening wire 218 is abutted against the outer end of the locking screw 216 to prevent the locking screw 216 from loosening. A double-layer safety is used to prevent the locking block 260 from loosening, and the structure is more stable.

[0091] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A spiral internal broaching machine, characterized in that, it includes: A broaching machine main body (100) with a lower tool holder (200) for clamping a tool (101). The tool holder (200) is connected to a first driving member (201) for driving the tool (101) to rotate around its own vertical central axis. The broaching machine main body (100) is provided with two vertically extending guide rods (110); A workbench (300) for supporting and fixing a workpiece and vertically aligning the workpiece with the tool holder (200). The workbench (300) is provided with two sliding holes (301) respectively slidingly matched with the two guide rods (110); Two second driving members (400), both connected to the workbench (300), for applying a vertical driving force to the workbench (300) to make it slide vertically along the guide rods (110); Wherein, the two guide rods (110) and the two second driving members (400) are both symmetrically arranged with respect to the rotation central axis of the tool (101), and the central axes of the two guide rods (110), the rotation central axis of the tool (101), and the two force application centers of the workbench (300) corresponding to the two second driving members (400) are coplanar; The upper part of the broaching machine main body (100) is provided with a tool lifting device (120). The tool lifting device (120) includes an upper tool holder (121) and a third driving member (122). The third driving member (122) is used to drive the upper tool holder (121) to move vertically. The upper tool holder (121) can clamp the top of the tool (101) and drive it to move vertically. The lower tool holder (200) and the upper tool holder (121) can both release the tool (101); The workbench (300) is provided with a pressing device (500) and a transfer assembly (600). The pressing device (500) includes a fourth driving member (510) and a pressing member (520) connected to its output end. The transfer assembly (600) is used for placing the workpiece and is provided with a positioning structure (601) for laterally positioning the workpiece. The transfer assembly (600) is slidably arranged on the workbench (300) and is connected to a fifth driving member (700) for driving it to slide back and forth. The transfer assembly (600) can receive the workpiece on both the front and rear sides of the pressing device (500); wherein, the transfer assembly (600) can slide to the lower side of the pressing device (500) and vertically align the pressing member (520) with the workpiece. At the same time, the fourth driving member (510) can drive the pressing member (520) to move vertically to press or release the workpiece; The transfer assembly (600) includes a transfer rack (610) and a support base (620) that can slide synchronously. The transfer rack (610) is connected to the output end of the fifth driving member (700). The support base (620) is detachably disposed on the transfer rack (610). The support base (620) is used to support the workpiece, and the positioning structure (601) is disposed on the support base (620). The workbench (300) is provided with a support bottom plate (310) extending forward and backward. A first guide rail (311) extending forward and backward is provided on the support bottom plate (310). The lower surface of the support base (620) is attached to the upper surface of the support bottom plate (310), and a guiding groove (621) matching with the first guide rail (311) is provided. A limiting plate (630) for abutting and limiting the upper end of the support base (620) is provided on the transfer rack (610). Tightening screws (640) are provided on both the front and rear sides of the transfer rack (610) with respect to the support base (620). Both of the two tightening screws (640) are threadedly inserted through the transfer rack (610) in the front-rear direction and are respectively used to abut against the front and rear ends of the support base (620). The transfer rack (610) is provided with a connecting rod (611), a connecting frame (612), and two pushing plates (613). The connecting rod (611) and the connecting frame (612) are respectively disposed on both the front and rear sides of the support base (620), and both are provided with the limiting plate (630) and the tightening screws (640). The two pushing plates (613) are arranged at a left-right interval. Both ends of the connecting rod (611) are respectively connected to the ends of the two pushing plates (613). One end of the connecting frame (612) is rotatably connected to the middle of one of the pushing plates (613), and the rotation center axis extends forward and backward. The other end is locked to the middle of the other pushing plate (613) through a first locking mechanism (650). The first locking mechanism (650) can elastically move to release the locking of the connecting frame (612), so that the connecting frame (612) can rotate to avoid the front-rear sliding path of the support base (620).

2. The spiral internal broaching machine according to claim 1, characterized in that: The transfer assembly (600) has a first assembled state and a second assembled state. When in the first assembled state, the connecting rod (611) is detachably connected to the front ends of the two pushing plates (613). When in the second assembled state, the connecting rod (611) is detachably connected to the rear ends of the two pushing plates (613). When the transfer assembly (600) is in the first assembled state or the second assembled state, the support base (620) is installed and limited between the connecting rod (611) and the connecting frame (612).

3. The spiral internal broaching machine according to claim 1, characterized in that: The end of the tool (101) is provided with a first conical surface (1011), the neck of the tool (101) is provided with an annular groove (1012), and an end of the annular groove (1012) close to the first conical surface (1011) is provided with a second conical surface (1013), and the lower tool holder (200) comprises: A main clamping tool body (210) having a mounting hole (211) at its center for mounting the tool (101); At least one group of clamping claws (220), wherein the group of clamping claws (220) comprises two clamping claws (220) symmetrically arranged relative to the central axis of the mounting hole (211), the clamping claws (220) being able to be radially adjusted along the mounting hole (211) and being arranged on the main clamping tool body (210), and having an end facing the mounting hole (211) provided with a third conical surface (221) for fitting with the second conical surface (1013); A positioning cone sleeve (230) is installed in the installation hole (211), and an end surface facing the clamping claw (220) is provided with an inwardly narrowed cone hole (231), wherein the wall of the cone hole (231) is used to fit with the first cone surface (1011); The clamping claw (220) can be adjusted radially along the mounting hole (211) to make the third conical surface (221) close to the second conical surface (1013), and to keep the first conical surface (1011) close to the wall of the conical hole (231), so as to limit the tool (101) axially and radially.

4. The spiral internal broaching machine according to claim 3, Features: The lower tool clamp (200) further comprises an elastic mechanism (240) and a driving mechanism (250), wherein the elastic mechanism (240) is used to apply an elastic force radially outward along the mounting hole (211) to the clamping claw (220), and the driving mechanism (250) is used to drive the clamping claw (220) to move radially inward along the mounting hole (211), and can cooperate with the elastic mechanism (240) to achieve radial position adjustment of the clamping claw (220) along the mounting hole (211).

5. The spiral internal broaching machine according to claim 4, Features: A fourth conical surface (222) is provided at one end of the clamping claw (220) away from the mounting hole (211); the driving mechanism (250) comprises a sliding sleeve (251) slidably mounted on the outside of the main clamping tool body (210) and a sixth driving member (252) for driving the sliding sleeve (251) to slide; a fifth conical surface (253) is provided on the inner wall of the sliding sleeve (251); the fifth conical surface (253) cooperates with and abuts against the fourth conical surfaces (222) of all the clamping claws (220).

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