A turning and milling combined gang tool turret numerical control machine tool

Abstract

The application discloses a turning and milling combined belt cutter tower numerical control machine tool and relates to the technical field of numerical control machining. The machine tool bed body is internally provided with a cross short-range moving part, and the machine tool bed body is internally provided with a workpiece fastening mechanism. The workpiece fastening mechanism is arranged in the inside of the main shaft power part and comprises a rotating shaft which is fixedly connected with a power output shaft of the main shaft power part. The right end of the rotating shaft is fixedly connected with a rotating connecting frame, the right end of the rotating connecting frame is fixedly connected with a rotating seat, the surface of the rotating seat is provided with three through grooves, the inside of each of the three through grooves is slidably connected with a chuck moving part, and the right end of the chuck moving part is fixedly connected with a workpiece chuck. The application can solve the problem that the workpiece is directly thrown and the safety risk is increased due to the pressure loss of the hydraulic device in the high-speed rotating process.

Description

Technical Field

[0001] This invention relates to the field of CNC machining technology, and more specifically, to a turning-milling composite CNC machine tool with a turret. Background Technology

[0002] The milling and turning composite CNC machine tool with turret is a device that integrates a CNC lathe with a drilling power unit. This device can complete the rotary drilling of the workpiece and perform drilling, tapping and other machining on the end face, outer circle or inner hole of the workpiece. The whole machine can realize the composite processes of drilling and tapping in one clamping, which improves the shape accuracy and production efficiency, and reduces the equipment footprint and tooling costs.

[0003] When machining workpieces using CNC machine tools, a fixture is needed to hold the workpiece in place. The fixture then rotates the workpiece, allowing the cutting tool to perform drilling operations. However, the workpiece is held in place by a hydraulic system. During high-speed rotation of the fixture, the hydraulic system may lose pressure, causing the fixture to fail to hold the workpiece securely. In this case, the workpiece could be flung away at high speed, increasing the safety risk. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a CNC machine tool with a turning and milling composite turret, so as to solve the problem that the hydraulic device may lose pressure during high-speed rotation, causing the workpiece to be thrown directly and increasing the safety risk.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A milling and turning composite CNC machine tool with a turret includes a machine bed, a spindle power unit mounted on the left end of the machine bed, a protective door slidably mounted on the surface of the machine bed, a cross-shaped short-stroke moving part mounted inside the machine bed, and a workpiece fastening mechanism located inside the spindle power unit. The workpiece fastening mechanism includes a rotating shaft fixedly connected to the power output shaft of the spindle power unit, a rotating connecting frame fixedly connected to the right end of the rotating shaft, a rotating seat fixedly connected to the right end of the rotating connecting frame, three through slots through the surface of the rotating seat, a chuck moving part slidably connected inside each of the three through slots, a workpiece chuck fixedly connected to the right end of each chuck moving part, a steel wire rope fixedly connected to the side of each of the three chuck moving parts that is close to each other, a guide rod fixedly connected to the end of each steel wire rope away from the chuck moving part, and a counterweight ball fixedly connected to the end of the guide rod away from the steel wire rope.

[0007] Furthermore, the main spindle power unit is internally fixedly connected to three hydraulic rods, the piston rods of the three hydraulic rods are respectively fixedly connected to the three chuck moving parts, the surface of the guide rod is provided with a guide groove, and the left surface of the rotating seat is fixedly connected to a guide frame, which is slidably connected to the inside of the guide groove.

[0008] Furthermore, the left surface of the rotating seat is rotatably connected to a support steering shaft that cooperates with the steel wire rope.

[0009] Furthermore, it also includes a tool changing mechanism, which is disposed on the surface of the machine tool bed. The tool changing mechanism includes a shifting spindle fixedly connected to the upper surface of the machine tool bed. A power motor is fixedly connected inside the cross short-stroke moving part. An active helical gear is fixedly connected to the output shaft of the power motor. An annular track is fixedly connected to the upper surface of the cross short-stroke moving part. A rotating bracket is slidably connected to the surface of the annular track. A longitudinal rotating shaft is rotatably inserted in the middle of the upper surface of the rotating bracket. A rotating handle is fixedly connected to the top end of the longitudinal rotating shaft. A transmission housing is fixedly connected to the bottom end of the longitudinal rotating shaft. Connecting rotating columns are provided inside both ends of the transmission housing. A tool head is fixedly connected to the ends of the two connecting rotating columns that are far apart from each other. A passive helical gear is fixedly connected to the ends of the two connecting rotating columns that are close to each other. The active helical gear can selectively mesh with either passive helical gear.

[0010] Furthermore, both ends of the transmission housing are rotatably connected to rotating covers, and the two connecting rotating columns are respectively inserted into the interior of the two rotating covers.

[0011] Furthermore, a side frame is fixedly connected to the middle of the outer arc surface of the transmission unit housing, a push rod is rotatably connected to the surface of the side frame, and the push rod is rotatably connected to a central push rod inside the transmission unit housing.

[0012] Furthermore, support blocks are fixedly connected to both ends of the outer arc surface of the transmission unit housing, and electric telescopic rods are fixedly connected to the ends of the two support blocks that are close to each other. The push rod is located between the two electric telescopic rods.

[0013] Furthermore, both ends of the central push rod are rotatably connected to a first rotating block, and the two passive helical gears are fixedly connected to a second rotating block on the side that is close to each other.

[0014] Furthermore, the surface of the transmission unit housing is fixedly fitted with an all-around shielding frame, the interior of the shifting shaft compartment is fixedly connected with an upper baffle, both sides of the interior of the shifting shaft compartment are fixedly connected with plate sleeves, both of the plate sleeves are slidably inserted with connecting long plates, and the right ends of the two connecting long plates are fixedly connected with compartment doors.

[0015] Furthermore, the front surface of the shifting shaft compartment is provided with a shifting shaft groove, and a sliding threaded sleeve is slidably connected inside the shifting shaft groove. A screw is inserted into the internal thread of the sliding threaded sleeve. A rocker arm is fixedly connected to the front end of the screw. An angle limiting frame is provided at the rear end of the screw. A strip groove is provided at both ends of the angle limiting frame. A guide post is slidably connected inside the strip groove. The guide post is fixedly connected to the upper surface of the cross short-range moving part. The screw is inserted into the interior of the all-around shielding frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) When the hydraulic rod loses pressure and the piston rod on the hydraulic rod becomes loose, the additional pulling force generated by the centrifugal force can continue to apply pressure to the workpiece, thereby reducing the speed at which the workpiece is thrown out between the three workpiece chucks, and thus improving the safety of the CNC machine tool during use.

[0018] (2) When the hydraulic rod loses pressure and the piston rod on the hydraulic rod becomes loose, the additional pulling force generated by the rotation of the counterweight ball applies pressure to the workpiece, thereby extending the time for the workpiece to be released from the three workpiece chucks, providing more emergency preparation time for the staff, and further improving the safety of CNC machine tool use.

[0019] (3) This solution reverses the position of the two cutter heads and pushes the passive helical cutting gear on the right side to disengage from the active helical cutting gear through two electric telescopic rods, so that the passive helical cutting gear on the left side meshes with the active helical cutting gear. During the replacement process, the workpiece can continue to be processed without affecting the replacement operation of the damaged cutter head, thus avoiding the need for a lot of processing time to replace the cutter head and affecting the processing efficiency of the workpiece.

[0020] (4) When the two cutter heads are reversed in this scheme, the all-round shielding frame also rotates. No matter which direction the all-round shielding frame rotates to, there is always one side located directly below the upper baffle. The working cutter head can be separated by the upper baffle and the all-round shielding frame, thereby improving the safety of the replacement operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the machine tool bed portion of the present invention;

[0023] Figure 3 This is a schematic diagram of the rotating seat portion of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the chuck moving part of the present invention;

[0025] Figure 5 This is a schematic diagram of the internal structure of the shift-axis magazine of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the upper surface of the cross-shaped short-range moving part of the present invention;

[0027] Figure 7 This is a schematic diagram of the angle limiting frame portion of the present invention;

[0028] Figure 8 This is a schematic diagram of the internal structure of the transmission unit housing of the present invention;

[0029] Figure 9 This is a schematic diagram of the push rod portion of the present invention;

[0030] Figure 10 This is a schematic diagram of the structure of the all-around shielding frame of the present invention.

[0031] Explanation of the labels in the diagram:

[0032] 1. Machine tool bed; 2. Protective door; 3. Spindle power unit; 4. Cross-shaped short-stroke traverse unit;

[0033] 501. Workpiece chuck; 502. Chuck moving part; 503. Hydraulic rod; 504. Counterweight ball; 505. Guide frame; 506. Guide tie rod; 507. Guide groove; 508. Steel wire rope; 509. Support steering shaft; 510. Rotating seat; 511. Rotating connecting frame; 512. Rotating shaft;

[0034] 601. Shifting shaft compartment; 602. All-around shielding frame; 603. Rotating handle; 604. Compartment door; 605. Rocker arm; 606. Screw; 607. Sliding threaded sleeve; 608. Cutting head; 609. Circular track; 610. Power motor; 611. Longitudinal rotating shaft; 612. Rotating bracket; 613. Angle limiting frame; 614. Transmission housing; 615. Guide column; 616. Support block; 617. Connecting rotating column; 618. Rotating cover; 619. Passive helical gear; 620. Active helical gear; 621. Electric telescopic rod; 622. Push rod; 623. Side frame; 624. Central push rod; 625. First rotating block; 626. Second rotating block; 627. Connecting long plate; 628. Plate sleeve; 629. Upper baffle. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1-4 A milling and turning composite CNC machine tool with a turret includes a machine bed 1, a spindle power unit 3 mounted on the left end of the machine bed 1, a protective door 2 slidably mounted on the surface of the machine bed 1, a cross-shaped short-stroke moving part 4 installed inside the machine bed 1, and a workpiece fastening mechanism located inside the spindle power unit 3. The workpiece fastening mechanism includes a rotating shaft 512 fixedly connected to the power output shaft of the spindle power unit 3, and a rotating connecting frame 511 fixedly connected to the right end of the rotating shaft 512. A rotating seat 510 is fixedly connected to the right end of the chuck. Three through slots are opened through the surface of the rotating seat 510. A chuck moving part 502 is slidably connected inside each of the three through slots. A workpiece chuck 501 is fixedly connected to the right end of the chuck moving part 502. A steel wire rope 508 is fixedly connected to the side of the three chuck moving parts 502 that is close to each other. A guide rod 506 is fixedly connected to the end of the steel wire rope 508 away from the chuck moving part 502. A counterweight ball 504 is fixedly connected to the end of the guide rod 506 away from the steel wire rope 508.

[0037] The main shaft power unit 3 is internally fixedly connected to three hydraulic rods 503. The piston rods of the three hydraulic rods 503 are respectively fixedly connected to the three chuck moving parts 502. The guide rod 506 has a guide groove 507 on its surface. The left surface of the rotating seat 510 is fixedly connected to a guide frame 505. The guide frame 505 is slidably connected to the inside of the guide groove 507. The left surface of the rotating seat 510 is rotatably connected to a support steering shaft 509 that cooperates with the wire rope 508.

[0038] By adopting the above technical solution, when processing the workpiece, the workpiece is placed between three workpiece chucks 501. Then, the hydraulic rod 503 pushes the three chuck moving parts 502 to move closer to each other, thereby driving the three workpiece chucks 501 to move closer to each other. The workpiece can be fixed by the three workpiece chucks 501. Then, the spindle power unit 3 provides power to drive the rotating shaft 512 and the rotating connecting frame 511 to rotate at high speed, thereby driving the rotating seat 510 to rotate. During the rotation of the rotating seat 510, the workpiece can be driven to rotate at high speed at the same time, so as to cooperate with the processing operation. When the hydraulic rod 503 loses pressure, it loses its thrust on the chuck moving part 502 and becomes loose. However, when the rotating seat 510 rotates at high speed, it drives the counterweight ball 504 to rotate at high speed. During the high-speed rotation of the counterweight ball 504, centrifugal force is generated, which can apply a pulling force to the wire rope 508 towards the outside of the rotating shaft 512. The direction of the force is adjusted by the support steering shaft 509, which in turn applies a force to the three chuck moving parts 502 towards each other. In this way, when the hydraulic rod 503 loses pressure and the piston rod on the hydraulic rod 503 becomes loose, the additional pulling force generated by the centrifugal force can continue to apply pressure to the workpiece. This increases the time for the workpiece to be released from the three workpiece chucks 501, providing more emergency preparation time for the operator and reducing the speed at which the workpiece flies out when it is thrown out from the three workpiece chucks 501, thereby improving the safety of the CNC machine tool during use.

[0039] like Figures 5-10 As shown, it also includes a tool changing mechanism, which is disposed on the surface of the machine tool bed 1. The tool changing mechanism includes a shifting spindle 601 fixedly connected to the upper surface of the machine tool bed 1. A power motor 610 is fixedly connected inside the cross short-stroke moving part 4. A drive helical gear 620 is fixedly connected to the output shaft of the power motor 610. An annular track 609 is fixedly connected to the upper surface of the cross short-stroke moving part 4. A rotating bracket 612 is slidably connected to the surface of the annular track 609. A rotating bracket 612 is rotatably inserted in the middle of the upper surface of the rotating bracket 612. A longitudinal rotating shaft 611 is provided, with a rotating handle 603 fixedly connected to the top end of the longitudinal rotating shaft 611 and a transmission housing 614 fixedly connected to the bottom end of the longitudinal rotating shaft 611. Both ends of the transmission housing 614 are provided with connecting rotating columns 617. A cutter head 608 is fixedly connected to the ends of the two connecting rotating columns 617 that are far apart from each other, and a passive helical cutting gear 619 is fixedly connected to the ends of the two connecting rotating columns 617 that are close to each other. The active helical cutting gear 620 can selectively mesh with either passive helical cutting gear 619.

[0040] The transmission housing 614 has rotating covers 618 rotatably connected to both ends. Two connecting rotating columns 617 are respectively inserted into the interior of the two rotating covers 618. A side frame 623 is fixedly connected to the middle of the outer arc surface of the transmission housing 614. A push rod 622 is rotatably connected to the surface of the side frame 623. The push rod 622 is rotatably connected to a central push rod 624 inside the transmission housing 614. Support blocks 616 are fixedly connected to both ends of the outer arc surface of the transmission housing 614. Electric telescopic rods 621 are fixedly connected to the ends of the two support blocks 616 that are close to each other. The push rod 622 is located between the two electric telescopic rods 621. First rotating blocks 625 are rotatably connected to both ends of the central push rod 624. Second rotating blocks 626 are fixedly connected to the sides of the two passive helical gears 619 that are close to each other.

[0041] The transmission housing 614 is fitted with an all-around shielding frame 602. The inside of the shifting shaft compartment 601 is fixedly connected to an upper baffle 629. Both sides of the inside of the shifting shaft compartment 601 are fixedly connected to plate sleeves 628. Both plate sleeves 628 are slidably inserted into the inside of each of the two plate sleeves 628. The right end of the two connecting long plates 627 is fixedly connected to a compartment door 604.

[0042] The front surface of the shifting shaft compartment 601 is provided with a shifting shaft groove. A sliding threaded sleeve 607 is slidably connected inside the shifting shaft groove. A screw 606 is threadedly inserted inside the sliding threaded sleeve 607. A rocker arm 605 is fixedly connected to the front end of the screw 606. An angle limiting frame 613 is provided at the rear end of the screw 606. Both arms of the angle limiting frame 613 are provided with strip grooves. A guide post 615 is slidably connected inside the strip groove. The guide post 615 is fixedly connected to the upper surface of the cross short-range moving part 4. The screw 606 is inserted into the interior of the all-around shielding frame 602.

[0043] By adopting the above technical solution, the workpiece is processed using the cutting head 608 as needed during high-speed rotation. When the cutting head 608 becomes damaged and needs replacement after prolonged use, the operator holds and rotates the rocker arm 605, causing the screw 606 to be pulled out from inside the all-around shielding frame 602. The screw 606 disengages from the surface of the angle limiting frame 613. Then, the operator holds and rotates the handle 603, causing the transmission housing 614, the rotating bracket 612, and the cutting head 608 to rotate, thus reversing the positions of the two cutting heads 608. During the rotation of the rotating bracket 612, the inclined surface of the angle limiting frame 613 is pressed and pushed, causing the angle limiting frame 613 to disengage from the longitudinal arm end of the rotating bracket 612. Then, the output end of the electric telescopic rod 621 located on the right extends out. The output end of the electric telescopic rod 621 located on the left retracts, causing the front end of the push rod 622 to rotate to the right. This pushes the passive helical gear 619 on the right to disengage from the active helical gear 620, while the passive helical gear 619 on the left meshes with the active helical gear 620. In this way, the power motor 610 drives the active helical gear 620 to rotate, which in turn drives the passive helical gear 619 to rotate. This causes the cutter head 608 on the left to rotate at high speed, while the cutter head 608 on the right does not rotate. Then, the chamber door 604 is moved out of the shift chamber 601. After opening the shift chamber 601, the non-rotating cutter head 608 on the right can be replaced. During the replacement process, the workpiece can continue to be processed. During the workpiece processing, since the lateral travel of the cross short-stroke moving part 4 is short, it does not affect the replacement operation of the cutter head 608.

[0044] After rotating the transmission housing 614 to reverse the direction of the two cutting heads 608, the screw 606 is rotated in the opposite direction and inserted into the all-around shielding frame 602. Then, the angle limiting frame 613 is pushed onto the surface of the rotating bracket 612, thus limiting the rotation of the rotating bracket 612 and fixing the position of the cutting head 608. The cutting head 608 can then be moved by the cross-shaped short-stroke moving part 4. The power motor 610 drives the active helical gear 620 to rotate, which in turn drives the meshing passive helical gear 619 to rotate, thus driving the cutting head 608 on the left to rotate at high speed, thereby machining the workpiece. When the two cutting heads 608 reverse direction, the all-around shielding frame 602 also rotates. Regardless of which direction the all-around shielding frame 602 rotates, one side is always directly below the upper baffle 629. This allows the upper baffle 629 and the all-around shielding frame 602 to separate the working cutting head 608, increasing the safety of the changeover operation.

[0045] Instructions for use: First, place the workpiece between the three workpiece chucks 501;

[0046] Next, the hydraulic rod 503 is used to push the three workpiece clamps 501 to fix the workpiece;

[0047] Next, the spindle power unit 3 provides power to drive the workpiece to rotate at high speed, thereby cooperating with the tool head 608 to perform machining operations;

[0048] At the same time, the cross short-stroke moving part 4 drives the cutter head 608 to move, and the power motor 610 drives the cutter head 608 to rotate at high speed to process the workpiece;

[0049] When the cutter head 608 needs to be replaced, hold and turn the rocker arm 605 to pull the screw 606 out from inside the all-around shielding frame 602.

[0050] Next, grasp and rotate the handle 603 to change the position of the two cutter heads 608;

[0051] Next, the reverse rotating screw 606 pushes the angle limiting frame 613 onto the surface of the rotating bracket 612 to fix the position of the cutter head 608;

[0052] Next, the electric telescopic rod 621 pushes the passive helical gear 619 on the right side to disengage from the active helical gear 620, and the passive helical gear 619 on the left side meshes with the active helical gear 620.

[0053] Finally, open the chamber door 604 to replace the damaged cutter head 608.

[0054] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A milling and turning composite CNC machine tool with a turret, comprising a machine tool bed (1), a spindle power unit (3) installed at the left end of the machine tool bed (1), a protective door (2) slidably installed on the surface of the machine tool bed (1), and a cross short-stroke moving part (4) installed inside the machine tool bed (1), characterized in that: It also includes a workpiece fastening mechanism, which is located inside the main spindle power unit (3). The workpiece fastening mechanism includes a rotating shaft (512) fixedly connected to the power output shaft of the main spindle power unit (3). A rotating connecting frame (511) is fixedly connected to the right end of the rotating shaft (512). A rotating seat (510) is fixedly connected to the right end of the rotating connecting frame (511). Three through slots are opened through the surface of the rotating seat (510). A chuck moving part (502) is slidably connected inside each of the three through slots. A workpiece chuck (501) is fixedly connected to the right end of the chuck moving part (502). A steel wire rope (508) is fixedly connected to the side of each of the three chuck moving parts (502) that is close to each other. The steel wire rope (508) is far away from each other. One end of the chuck moving part (502) is fixedly connected to a guide rod (506), and the end of the guide rod (506) away from the steel wire rope (508) is fixedly connected to a counterweight ball (504). The inside of the main shaft power part (3) is fixedly connected to three hydraulic rods (503). The piston rods of the three hydraulic rods (503) are respectively fixedly connected to the three chuck moving parts (502). The surface of the guide rod (506) is provided with a guide groove (507). The left surface of the rotating seat (510) is fixedly connected to a guide frame (505). The guide frame (505) is slidably connected to the inside of the guide groove (507). The left surface of the rotating seat (510) is rotatably connected to a support steering shaft (509) that cooperates with the steel wire rope (508). It also includes a tool changing mechanism, which is disposed on the surface of the machine tool bed (1). The tool changing mechanism includes a shifting shaft compartment (601) fixedly connected to the upper surface of the machine tool bed (1). A power motor (610) is fixedly connected inside the cross short-stroke moving part (4). An active helical gear (620) is fixedly connected to the output shaft of the power motor (610). A ring track (609) is fixedly connected to the upper surface of the cross short-stroke moving part (4). A rotating bracket (612) is slidably connected to the surface of the ring track (609). A longitudinal rotating shaft (611) is rotatably inserted in the middle of the upper surface of the rotating bracket (612). A rotating handle (603) is fixedly connected to the top of the longitudinal rotating shaft (611). A transmission housing (614) is fixedly connected to the bottom of the longitudinal rotating shaft (611). A connecting rotating column (617) is provided inside both ends of the transmission housing (614). The ends of the connecting rotating columns (617) that are far apart from each other are fixedly connected to a cutter head (608). The ends of the two connecting rotating columns (617) that are close to each other are fixedly connected to a passive helical gear (619). The active helical gear (620) can selectively mesh with either passive helical gear (619). The outer arc surface of the transmission housing (614) is fixedly connected to a side frame (623). The surface of the side frame (623) is rotatably connected to a push rod (622). The push rod (622) is located inside the transmission housing (614) and is rotatably connected to a central push rod (624). The two ends of the outer arc surface of the transmission housing (614) are fixedly connected to support blocks (616). The ends of the two support blocks (616) that are close to each other are fixedly connected to an electric telescopic rod (621). The push rod (622) is located between the two electric telescopic rods (621).

2. The CNC machine tool with milling and turning mechanism and turret according to claim 1, characterized in that: Both ends of the transmission housing (614) are rotatably connected to rotating covers (618), and the two connecting rotating columns (617) are respectively inserted into the interior of the two rotating covers (618).

3. A turning-milling composite CNC machine tool with a turret according to claim 1, characterized in that: Both ends of the central push rod (624) are rotatably connected to a first rotating block (625), and the two passive helical gears (619) are fixedly connected to a second rotating block (626) on the side that is close to each other.

4. A turning-milling composite CNC machine tool with a turret according to claim 1, characterized in that: The surface of the transmission housing (614) is fixedly fitted with an all-around shielding frame (602). The interior of the shifting shaft compartment (601) is fixedly connected with an upper baffle (629). Both sides of the interior of the shifting shaft compartment (601) are fixedly connected with plate sleeves (628). Both plate sleeves (628) are slidably inserted with connecting long plates (627). The right ends of the two connecting long plates (627) are fixedly connected with compartment doors (604).

5. A turning-milling composite CNC machine tool with a turret according to claim 4, characterized in that: The front surface of the shifting shaft compartment (601) is provided with a shifting shaft groove. A sliding threaded sleeve (607) is slidably connected inside the shifting shaft groove. A screw (606) is threadedly inserted inside the sliding threaded sleeve (607). A rocker arm (605) is fixedly connected to the front end of the screw (606). An angle limiting frame (613) is provided at the rear end of the screw (606). Both arms of the angle limiting frame (613) are provided with strip grooves. A guide post (615) is slidably connected inside the strip groove. The guide post (615) is fixedly connected to the upper surface of the cross short-range moving part (4). The screw (606) is inserted into the interior of the all-round shielding frame (602).

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