A feeding trolley device with chip-free cutting function

Abstract

The present invention provides a feeding trolley device with a chip-free cutting function, comprising a fixed seat, a rotatable main shaft arranged on the fixed seat, and a cutting blade provided at the end of the main shaft. When the pipe passes through the main shaft and the main shaft rotates, the cutting blade pre-cuts the pipe. The present invention can continuously transport and pre-cut the pipe, ensuring full automation efficiency before the pipe is bent.

Description

Technical Field

[0001] The invention relates to the field of pipe bending processing, in particular to a feeding trolley device with a chip-free cutting function. Background Art

[0002] At present, when pipe fittings are cut, opened and bent, they are usually cut and bent separately. However, the separate processing method will lead to an increase in the number of working steps, high labor intensity of manual material turnover and low overall processing efficiency. If multiple equipment are integrated together for continuous processing, the merger of multiple independent workstations will inevitably lead to a larger equipment footprint. Moreover, after the integration of multiple independent workstations, shorter pipe fittings cannot be processed on the entire equipment, and longer pipe fittings are prone to sagging and bending due to gravity. Summary of the Invention

[0003] The object of the present invention is to provide a feeding trolley device with a chip-free cutting function that can continuously transport and pre-cut pipe fittings to ensure full automation efficiency before pipe bending.

[0004] In order to solve the above technical problems, the present invention provides a feeding trolley device with a chip-free cutting function, including a fixed seat, a rotatable main shaft arranged on the fixed seat, and a cutting blade provided at the end of the main shaft. When the pipe passes through the main shaft and the main shaft rotates, the cutting blade pre-cuts the pipe.

[0005] Furthermore, a sliding sleeve is provided on the outer circumference of the main shaft, and the sliding sleeve can move axially relative to the main shaft. A clamping jaw seat is provided at the end of the main shaft, and a plurality of rotatable clamping jaws are provided on the clamping jaw seat along the circumference. The side of the clamping jaw close to the sliding sleeve has a first inclined surface, and the first inclined surface is matched with the sliding sleeve. A fixed core sleeve is built into the clamping jaw seat. When the sliding sleeve moves toward the clamping jaw seat, the clamping jaw clamps the pipe fitting.

[0006] Furthermore, a slider is connected to the side of the clamping jaw seat away from the main shaft. The slider can move radially relative to the clamping jaw seat. An elastic member is connected between the slider and the clamping jaw seat, and the cutting blade is connected to the slider.

[0007] Furthermore, the end of the sliding sleeve close to the clamping jaw seat has a pressure cover, the side of the pressure cover close to the slider has a second inclined surface, the side of the slider close to the pressure cover has a third inclined surface, and the second inclined surface and the third inclined surface fit together. When the sliding sleeve moves toward the clamping jaw seat, the slider moves away from the pipe fitting.

[0008] Furthermore, a driving member is provided on one side of the fixing seat, and the end of the sliding sleeve close to the driving member is movably connected to the driving sleeve, and the feed fork is used to connect the output end of the driving member and the driving sleeve.

[0009] The beneficial effect of the present invention is that the pipe fittings can be continuously transported and pre-cut through the chipless cutting trolley device, thereby ensuring full automation efficiency before the pipe fittings are bent. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] Figure 2 It is a structural schematic diagram of the straightening component in the present invention.

[0012] Figure 3 It is a structural schematic diagram of the magnetic suspension core rod device in the present invention.

[0013] Figure 4 It is a diagram of the internal structure of the magnetic suspension core rod device in the present invention.

[0014] Figure 5 It is a structural diagram of the feeding component in the present invention.

[0015] Figure 6 It is a structural schematic diagram of the chipless cutting trolley device in the present invention.

[0016] Figure 7 It is a top view of the chipless cutting trolley device in the present invention.

[0017] Figure 8 This invention Figure 7 Cross-section along line BB.

[0018] Figure 9 This invention Figure 8 A partial enlarged view of the .

[0019] Figure 10 It is a side view of the chipless cutting trolley device of the present invention.

[0020] Figure 11 This invention Figure 10 Section view along line AA.

[0021] Figure 12 This invention Figure 11 A partial enlarged view of the . DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0023] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0024] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0025] like Figure 1-12 The present invention provides a feeding trolley device with a chipless cutting function, which is suitable for a fully automatic pipe bending machine, wherein the fully automatic pipe bending machine includes a coil feeding rack 1, a straightening component 2, a magnetic levitation core rod device 3, a feeding component 4, a chipless cutting trolley device 5 and a pipe bending component 6 arranged in sequence, wherein one end of the pipe fitting 7 is wound around the outer periphery of the coil feeding rack 1, and the other end passes through the straightening component 2, the magnetic levitation core rod device 3, the feeding component 4 and the chipless cutting trolley device 5 in sequence, and then the pipe bending component 6 bends the pipe fitting 7.

[0026] Specifically, the raw material of the pipe fitting is in the form of a coil, which is wound and fixed on a coil loading rack, and then one end of the pipe fitting is pulled out and introduced into the position of the straightening component, and the coil is straightened into a flat pipe fitting by the straightening component, and then the inside of the pipe fitting is supported by a magnetic levitation core rod device to ensure the bending effect of the pipe fitting when the subsequent bending component bends the pipe fitting. In addition, since the pipe fitting will pass through the feeding component and the chipless cutting trolley device before bending, the pipe fitting is pre-cut at the designated position of the pipe fitting itself by the chipless cutting trolley device, and then the pre-cut component is sent to the bending component for bending processing with the cooperation of the feeding component, and the pre-cut position is broken by manual or automatic machines, which not only ensures the continuous transportation of the pipe fitting, but also ensures that the pre-cutting and breaking method can improve the pipe cutting effect.

[0027] Among them, the main structure of the coil loading rack is a disc-shaped support frame, and the coil is wound on the outer periphery of the disc-shaped support frame. At the same time, an oil mist nozzle is connected to the center of the support frame. The coil is wound on the coil loading rack and connected to the oil mist nozzle at one end port. The oil mist nozzle is connected to an external oil supply device through an oil pipe, etc. The oil mist is sprayed on the inner wall of the coil through the oil mist nozzle, so that the inside of the pipe has a lubricating effect of oil mist, thereby increasing the use effect of the subsequent magnetic levitation core rod device.

[0028] In particular, the structure of the pipe bending components in this solution is the same as that of the existing pipe bending equipment, and will not be described in detail here.

[0029] It is worth mentioning that the pipe fittings processed in this solution are copper pipes.

[0030] Preferably, the magnetic levitation core rod device 3 includes a magnetic levitation core rod seat 31, a plurality of outer magnetic rings 32 placed inside the magnetic levitation core rod seat 31, a core rod 33 passed through the magnetic levitation core rod seat 31, and a plurality of inner magnetic rings 34 sleeved on the outside of the core rod 33 and corresponding to the plurality of outer magnetic rings 32. The outer magnetic rings 32 and the inner magnetic rings 34 are coupled with each other. When the pipe 7 passes through the magnetic levitation core rod seat 31, the outer magnetic rings 32 are located outside the pipe 7, and the inner magnetic rings 34 and the core rod 33 are located inside the pipe 7; an outer guide ring 35 is provided between two adjacent outer magnetic rings 32, and an inner guide ring 36 is provided between two adjacent inner magnetic rings 34.

[0031] Specifically, by coupling the outer magnetic ring and the inner magnetic ring, the core rod is suspended in the magnetic levitation core rod seat under the action of magnetic force. When the pipe passes through the magnetic levitation core rod seat, the pipe wall of the pipe is located between the core rod and the magnetic levitation core rod seat, and the core rod supports the inside of the pipe to improve the stability of the pipe during subsequent pipe bending processing.

[0032] At the same time, due to the setting of the outer guide ring and the inner guide ring, when the pipe passes through the magnetic suspension core rod seat, it can be guided by the inner and outer guide rings to ensure the accurate movement direction of the pipe, and the inner and outer guide rings can also be used to separate and fix the inner and outer magnetic rings to ensure the stability between the inner and outer magnetic rings, further increasing the effect of the core rod when in use.

[0033] The outer magnetic ring and the inner magnetic ring are both made of magnets, and the outer magnetic ring and the inner magnetic ring attract each other, so that the part of the core rod with the inner magnetic ring is stably restricted to the position of the magnetic suspension core rod seat.

[0034] Preferably, the magnetic levitation core rod seat 31 is arranged on the slide 37, and the two sides of the slide 37 are movably arranged on the guide rail 38, and a screw rod 39 is passed through the middle of the slide 37 and connected. When the screw rod 39 rotates relative to the slide 37, the slide 37 moves along the guide rail 38.

[0035] Specifically, since the position where the pipe is bent and the radius of the arc produced by the bend are different, the magnetic levitation mandrel seat is set on the slide, and the slide is moved to drive the magnetic levitation mandrel seat and the core rod inside it to move, thereby ensuring that the core rod can stably and adaptively support the inside of the pipe, thereby increasing the bending effect.

[0036] Among them, when the slide moves, the lead screw is driven to rotate by driving parts such as servo motors and transmission mechanisms such as synchronous pulleys and synchronous belts. In this solution, the lead screw and the slide are threadedly connected. During the rotation of the lead screw, the threaded connection can drive the slide to move linearly along the guide rail, thereby stably driving the core rod to move.

[0037] Preferably, at least two sets of guide wheel groups are connected to the slide 37, and at least two sets of guide wheel groups are placed on both sides of the magnetic levitation core rod seat 31. The guide wheel group includes at least two rotatable guide wheels 310 provided on the slide 37. When the pipe fitting 7 passes through the magnetic levitation core rod seat 31, the parts of the pipe fitting 7 located on both sides of the magnetic levitation core rod seat 31 are located between at least two guide wheels 310.

[0038] Specifically, in order to ensure that the core rod can accurately support the inside of the pipe, this solution uses the guide wheel groups on both sides of the magnetic levitation core rod seat to guide and position the pipe parts entering the magnetic levitation core rod seat and the pipe parts leaving the magnetic levitation core rod seat, so that the pipes at these two locations are clamped and guided by at least two guide wheels, and the rotatable setting of the guide wheels is used to reduce the friction between the guide wheels and the pipes, thereby improving the accuracy of the fit between the pipes and the core rod.

[0039] Preferably, the chip-free cutting trolley device 5 includes a fixed seat 51, a rotatable main shaft 52 arranged on the fixed seat 51, and a cutting blade 53 provided at the end of the main shaft 52. When the pipe 7 passes through the main shaft 52 and the main shaft 52 rotates, the cutting blade 53 pre-cuts the pipe 7.

[0040] Specifically, after passing through the magnetic levitation core rod seat, the pipe will continue to pass through the main shaft position. At this time, the fixed seat will be moved and the main shaft will be driven to move to the specified position, so that the cutting blade is located at the position where the pipe is waiting for pre-cutting. Then the main shaft is rotated to drive the cutting blade to pre-cut the outer periphery of the pipe, so that the pipe can be broken off at the pre-cut position manually or by an automatic machine.

[0041] Among them, pre-cutting refers to the circular cutting process of the outer circumference of the pipe by a cutting blade without cutting it off, in order to facilitate the subsequent breaking step.

[0042] In one embodiment of the present scheme, a servo motor is provided on one side of the fixed seat, and the output end of the servo motor and the end of the main shaft are both provided with synchronous wheels, and the two synchronous wheels are connected by a synchronous pulley, so that when the servo motor is started, it can drive the main shaft to rotate, and then drive the cutting blade to perform annular cutting on the outer circumference of the pipe.

[0043] Preferably, a sliding sleeve 54 is provided on the outer periphery of the main shaft 52, and the sliding sleeve 54 can move axially relative to the main shaft 51. A clamping jaw seat 55 is provided at the end of the main shaft 51, and the clamping jaw seat 55 is provided with a plurality of rotatable clamping jaws 56 along the circumferential direction. The side of the clamping jaw 56 close to the sliding sleeve 54 has a first inclined surface 57, and the first inclined surface 57 is matched with the sliding sleeve 54. The clamping jaw seat 55 has a built-in core sleeve 58. When the sliding sleeve 54 moves toward the clamping jaw seat 55, the clamping jaw 56 clamps the pipe fitting 7.

[0044] Specifically, when the pipe needs to be transported and fed to the bending part, the sliding outer sleeve is moved toward the direction of the clamping claw seat. During the movement, the sliding outer sleeve will contact the first inclined surface of the clamping claw. Then, as the sliding outer sleeve continues to move, the clamping claw is pushed toward the position of the pipe through the first inclined surface to rotate and clamp it, and then the pipe is clamped and fixed by multiple clamps. At this time, the pipe can be transported a specified distance by only moving the fixing seat.

[0045] Among them, a tension spring or a coil spring is provided at the position where the clamping jaw is rotated relative to the clamping jaw seat, so that when the clamping jaw is not pushed by the sliding sleeve, the clamping jaw will naturally open in the direction away from the pipe fitting under the action of the coil spring or the tension spring, so that the pipe fitting can freely enter and exit the main shaft position.

[0046] It is worth mentioning that this solution also provides a core-fixing sleeve inside the clamping jaw seat, which can limit the initial position of the pipe fitting within a certain range to facilitate the stability of the clamping jaws when clamping the pipe fitting.

[0047] Preferably, a slider 59 is connected to the side of the clamping jaw seat 55 away from the main shaft 52, and the slider 59 can move radially relative to the clamping jaw seat 55. An elastic member is connected between the slider 59 and the clamping jaw seat 55. The cutting blade 53 is connected to the slider 59. The end of the sliding sleeve 54 close to the clamping jaw seat 55 has a pressure cover 510, and the side of the pressure cover 510 close to the slider 59 has a second inclined surface 511, and the side of the slider 59 close to the pressure cover 510 has a third inclined surface 512, and the second inclined surface 511 and the third inclined surface 512 fit each other. When the sliding sleeve 54 moves toward the clamping jaw seat 55, the slider 59 moves in the direction away from the pipe fitting 7.

[0048] Specifically, when it is necessary to pre-cut the outer circumference of the pipe fitting by the cutting blade, the sliding outer sleeve is moved in the direction away from the clamping claw seat, so that the sliding outer sleeve drives the pressure cover to move to a position away from the clamping claw seat. At this time, due to the cooperation between the second inclined surface and the third inclined surface, during the movement of the pressure cover, the second inclined surface will push and press the third inclined surface, so that the slider moves radially relative to the clamping claw seat, and the slider drives the cutting blade to approach the pipe fitting, so that the cutting blade can pre-cut the pipe fitting. After the pre-cutting is completed, the sliding outer sleeve moves in the opposite direction to cause the pressure cover to move in the opposite direction. At this time, the second inclined surface no longer pushes the third inclined surface, and the elastic force of the elastic member pushes the slider to reset, thereby mobilizing the cutting blade to reset and move to a position away from the pipe fitting, so as to avoid interference between the two processes of the clamping claw clamping the pipe fitting and the cutting blade cutting the pipe fitting.

[0049] The elastic member adopts a spring, and the cutting blade is fixed to one side of the slider through parts such as a fixed shaft and a nut.

[0050] Preferably, a driving member 513 is provided on one side of the fixing seat 51 , and the end of the sliding sleeve 54 close to the driving member 513 is movably connected to the driving sleeve 514 , and the feed fork 515 is used to connect the output end of the driving member 513 and the driving sleeve 514 .

[0051] Specifically, when the sliding sleeve needs to be moved, the feed fork is pushed or pulled by starting the driving member, so that the feed fork pulls or pushes the driving sleeve. Since the driving sleeve is movably connected to the sliding sleeve, when the driving sleeve moves, the sliding sleeve will be moved synchronously to achieve the purpose of moving the sliding sleeve.

[0052] The structure of the feed fork is similar to the principle of a lever. When the feed fork is pushed by the driving member, the feed fork pulls the driving sleeve, and when the feed fork is pulled by the driving member, the feed fork pushes the driving sleeve.

[0053] In particular, the movable connection between the sliding sleeve and the driving sleeve means that the driving sleeve can push or pull the sliding sleeve to move, and the sliding sleeve can rotate relative to the driving sleeve. In one embodiment of the present scheme, an annular groove is provided on the outer periphery of the sliding sleeve, and the inner periphery of the driving sleeve has an annular structure located in the annular groove, so that the required movable connection is formed between the sliding sleeve and the driving sleeve.

[0054] In one embodiment of this solution, the driving member adopts a servo electric cylinder, an electric push rod and other structures.

[0055] Preferably, the straightening component 2 includes at least two relatively arranged initial guide wheels 21, an oil box 22, a material-free detection device 23, a rounding wheel group, a longitudinal straightening wheel group and a transverse straightening wheel group arranged in sequence. The rounding wheel group includes at least two relatively arranged rounding wheels 24. The longitudinal straightening wheel group includes a plurality of longitudinal straightening wheels 25, and the plurality of longitudinal straightening wheels 25 are staggered on both sides of the vertical direction of the pipe fitting 7. The transverse straightening wheel group includes a plurality of transverse straightening wheels 26, and the plurality of transverse straightening wheels 26 are staggered on both sides of the horizontal direction of the pipe fitting 7.

[0056] Specifically, when one end of the coil passes through the straightening component, the bent coil is first straightened by the initial guide wheel, and the outer wall of the pipe is lubricated when the pipe passes through the oil box position. Then the pipe passes through the rounding wheel group, the longitudinal straightening wheel group and the transverse straightening wheel group in turn to calibrate the pipe multiple times, thereby increasing the calibration effect of the pipe and avoiding the coil being in a bent state during subsequent pipe processing.

[0057] It is worth mentioning that at least two of the rounding wheels in the rounding wheel group are arranged relative to each other, that is, the two rounding wheels are tangent to each other. Therefore, when calibrating the pipe, the main focus is on calibrating and stretching the outer wall curvature of the pipe; and the multiple longitudinal straightening wheels in the longitudinal straightening wheel group are staggered on both sides of the vertical direction of the pipe, so the longitudinal straightening wheels are mainly used to straighten the pipe in the vertical direction; similarly, the multiple transverse straightening wheels in the transverse straightening wheel group are staggered on both sides of the horizontal direction of the pipe, so the transverse straightening wheels are mainly used to straighten the pipe in the horizontal direction, and in three consecutive straightening processes, the pipe is calibrated from the coil form to the straight pipe form.

[0058] Among them, there is a sponge inside the oil box. After volatile oil is introduced into the oil box, the sponge absorbs the volatile oil, so that the surface of the pipe fittings can be lubricated by the sponge when the pipe fittings pass through the oil box. Combined with the lubrication of the inner wall of the pipe fittings at the coil loading rack, the inner and outer walls of the pipe fittings are lubricated. As a result, when the pipe fittings pass through the magnetic levitation core rod seat, there is a lubrication effect between the pipe fittings and the outer magnetic ring, and between the pipe fittings and the inner magnetic ring (core rod), thereby reducing the wear of the pipe fittings and components.

[0059] In particular, the material-free detection device is mainly used to detect whether the pipe material exists in the straightening component or the equipment, wherein the material-free detection device mainly includes a gravity wheel that can move up and down a certain distance and a travel switch located at the bottom of the material-free detection device. When the pipe passes through the straightening component, the gravity wheel is supported by the pipe, and then the gravity wheel is lifted up by the pipe. When there is no pipe, the gravity wheel falls under the influence of gravity, and the gravity wheel falls and presses on the travel switch. At this time, the travel switch opens and sends a signal to indicate that there is no material in the pipe.

[0060] Preferably, the feeding component 4 includes a guide rail 41 and a movably provided feeding platform 42 on the guide rail 41 , and the chipless cutting trolley device 5 is installed on the feeding platform 42 .

[0061] Specifically, the feeding platform moves along the guide rail to drive the chipless cutting trolley device to move, thereby achieving the purpose of clamping the pipe at a specified position and feeding the pipe, and moving the cutting blade to the position where the pipe needs to be pre-cut.

[0062] In one embodiment of the present scheme, there is a rack on one side of the guide rail, and the feeding platform is moved with a rotatable gear, the gear and the rack are in meshing cooperation, and the gear is controlled by a servo motor, so that when the servo motor starts to drive the gear to rotate, the feeding platform is driven to move along the guide rail through the cooperation of the gear and rack.

[0063] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. A feeding trolley device with chipless cutting function, characterized in that: The invention comprises a fixing seat (51), a main shaft (52) rotatably arranged on the fixing seat (51), and a cutting blade (53) provided at the end of the main shaft (52). When the pipe (7) passes through the main shaft (52) and the main shaft (52) rotates, the cutting blade (53) pre-cuts the pipe (7). Pre-cutting refers to the circular cutting process of the outer periphery of the pipe without cutting by the cutting blade; the outer periphery of the main shaft (52) is provided with a sliding outer sleeve (54), and the sliding outer sleeve (54) can be relative to the main shaft (5 2) for axial movement, a clamping jaw seat (55) is provided at the end of the main shaft (52), and a plurality of rotatable clamping jaws (56) are provided on the clamping jaw seat (55) along the circumferential direction. The side of the clamping jaw (56) close to the sliding outer sleeve (54) has a first inclined surface (57), and the first inclined surface (57) is matched with the sliding outer sleeve (54). A fixed core sleeve (58) is built into the clamping jaw seat (55). When the sliding outer sleeve (54) moves toward the clamping jaw seat (55), the clamping jaw (56) clamps the pipe fitting (7); When the pipe fitting needs to be transported and fed to the pipe bending part, the sliding outer sleeve is moved toward the direction of the clamping jaw seat. During the movement, the sliding outer sleeve contacts the first inclined surface of the clamping jaw. Then, as the sliding outer sleeve continues to move, the first inclined surface pushes the clamping jaw toward the position of the pipe fitting to rotate and clamp it, and then the pipe fitting is clamped and fixed by multiple clamping jaws. At this time, the fixed seat is moved to transport the pipe fitting to a specified distance. A slider (59) is connected to the side of the clamping jaw seat (55) away from the main shaft (52), and the slider (59) can move radially relative to the clamping jaw seat (55). An elastic member is connected between the slider (59) and the clamping jaw seat (55), and the cutting blade (53) is connected to the slider (59); the end of the sliding sleeve (54) close to the clamping jaw seat (55) is provided with a pressure cover (510), the side of the pressure cover (510) close to the slider (59) is provided with a second inclined surface (511), and the side of the slider (59) close to the pressure cover (510) is provided with a third inclined surface (512), and the second inclined surface (511) and the third inclined surface (512) are in contact with each other. When the sliding sleeve (54) moves toward the clamping jaw seat (55), the slider (59) moves in a direction away from the pipe fitting (7); When it is necessary to pre-cut the outer circumference of the pipe fitting with the cutting blade, the sliding outer sleeve is moved in the direction away from the clamping jaw seat, so that the sliding outer sleeve drives the pressure cover to move to a position away from the clamping jaw seat. At this time, due to the cooperation between the second inclined surface and the third inclined surface, during the movement of the pressure cover, the second inclined surface will push and press the third inclined surface, so that the slider moves radially relative to the clamping jaw seat, and the slider drives the cutting blade to approach the pipe fitting, so that the cutting blade can pre-cut the pipe fitting. After the pre-cutting is completed, the sliding outer sleeve moves in the opposite direction to cause the pressure cover to move in the opposite direction. At this time, the elastic member pushes the slider to reset, thereby mobilizing the cutting blade to reset and move to a position away from the pipe fitting.

2. The feeding trolley device with chipless cutting function according to claim 1, characterized in that: A driving member (513) is provided on one side of the fixing seat (51), and a driving sleeve (514) is movably connected to the end of the sliding sleeve (54) near the driving member (513), and a feed fork (515) is used to connect the output end of the driving member (513) and the driving sleeve (514).

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