Transmission shaft and thread rolling machine

Abstract

The invention discloses a transmission shaft and a thread rolling machine, and relates to the field of transmission shafts, the transmission shaft comprises a connecting pipe and split rods arranged at the two ends of the connecting pipe, the two ends of each split rod are provided with a sliding key rod and a universal joint respectively, the split rods are linearly inserted into the connecting pipe through the sliding key rods, the connecting pipe is externally provided with a spherical body, and the spherical body is externally and rotatably sleeved with a ball shaft sleeve in a matched mode; the outer side of the connecting pipe in the middle of the transmission shaft is positioned through the ball shaft sleeve, the ball shaft sleeve and the supporting frame are connected through the damping telescopic rods to form a frame capable of being deviated, in the thread rolling roller distance adjusting process, the damping telescopic rods are arranged to enable the ball shaft sleeve to move in the plane of the supporting frame, and therefore the distance between the thread rolling rollers can be adjusted. All the damping telescopic rods can dynamically position the middle of the transmission shaft in a telescopic mode, the middle of the transmission shaft is supported through the damping effect of the damping telescopic rods, vibration generated in the rotating process of the transmission shaft is reduced, the machining quality of the thread roller is improved, and the service life of the transmission shaft and related connecting pieces is prolonged.

Description

Technical Field

[0001] The invention relates to the field of transmission shafts, and in particular to a transmission shaft and a thread rolling machine. Background Art

[0002] The thread rolling machine uses two synchronously rotating thread rolling rollers to roll the surface of a metal rod into a threaded surface. The two thread rolling rollers can be opened and closed to adjust the spacing. The drive device and the thread rolling rollers are transmitted through a movable shaft to adapt to the adjustment movement of the thread rolling rollers.

[0003] The transmission stability of the drive shaft has a great influence on the processing quality. The movable drive shaft of the traditional thread rolling roller has a large span, and only the two ends of the drive shaft are connected and fixed. The middle part of the drive shaft lacks effective support and is prone to shaking. Long-term shaking will also make the connectors at both ends of the shaft easy to loosen. Summary of the invention

[0004] The purpose of the present invention is to provide a transmission shaft and a thread rolling machine, which are used to solve the problem that the transmission shaft of the traditional thread rolling machine is prone to transmission shaking and affects the processing accuracy due to its long span and lack of support in the middle.

[0005] In order to solve the problems existing in the prior art, the technical solution of the present invention is as follows: A transmission shaft comprises a connecting tube and a split rod arranged at both ends of the connecting tube, a sliding key rod and a universal joint are respectively arranged at both ends of the split rod, the split rod is linearly inserted into the connecting tube through the sliding key rod, the connecting tube has a spherical body on the outside, a ball shaft sleeve is rotatably sleeved on the outside of the spherical body, and the ball shaft sleeve is connected to a support frame through a damping movable part so that the ball shaft sleeve can move in the plane of the support frame.

[0006] Preferably, the damping movable part comprises four damping telescopic rods, which are cross-distributed, and two ends of the damping telescopic rods are rotatably connected to the support frame and the ball sleeve respectively.

[0007] Preferably, both ends of the damping telescopic rod are rotatably connected to the support frame and the ball sleeve respectively through damping bearings.

[0008] Preferably, the damping movable part includes two damping telescopic rods, the ball sleeve slides linearly left and right through the T-shaped block and the support frame, the two damping telescopic rods are symmetrically distributed on both sides of the T-shaped block, and when the T-shaped block moves, one damping telescopic rod will be lengthened and the other damping telescopic rod will be compressed.

[0009] Preferably, the damping telescopic rod includes an insert tube and an insert rod, a sliding plug is slidably arranged in the insert tube, the insert rod is slidably inserted into the insert tube and connected with the sliding plug, a plurality of grooves are annularly distributed on the edge of the sliding plug, a gear is rotatably arranged in the groove, a plurality of wire grooves are annularly distributed on the inner wall of the insert tube, a rack is provided in the wire groove, the gear protruding from the surface of the sliding plug is inserted into the wire groove and meshed with the rack, and the insert tube is filled with damping fluid.

[0010] Preferably, a rotating rack is arranged in the embedded groove, one end of the rotating rack is rotatably connected to the embedded groove through a torsion spring, a plurality of gears are arranged and rotatably installed on the outer edge of the rotating rack, the inner side of the rotating rack is in the shape of an inclined surface, a ball is arranged in the sliding plug, the ball abuts against the inclined surface of the rotating rack, a T-shaped rod is fixed to the ball, the T-shaped rod is rotatably inserted into the interior of the insertion rod, a limiting groove is provided on the surface of the insertion rod, the end of the T-shaped rod passes through the limiting groove, a screw sleeve is threadedly connected to the surface of the insertion rod, and the screw sleeve abuts against the end of the T-shaped rod.

[0011] Preferably, the inner end of the insert is provided with a partition plate through spring elastic sliding.

[0012] Preferably, the damping telescopic rod includes an insert tube and an insert rod, a sliding plug is slidably arranged in the insert tube, the insert rod is slidably inserted into the insert tube and connected with the sliding plug, a variable volume cavity is formed between the sliding plug and the end of the insert tube, and the variable volume cavities of the two symmetrically distributed damping telescopic rods are connected through a connecting pipe.

[0013] A thread rolling machine based on the transmission shaft comprises two symmetrically distributed thread rolling rollers and two drive shafts driven by synchronous motors. The two transmission shafts are respectively arranged between the thread rolling rollers and the drive shafts on both sides, and the universal joints at both ends of the transmission shafts respectively connect the thread rolling rollers and the drive shafts.

[0014] Compared with the related art, the present invention has the following beneficial effects: The present invention adopts a ball sleeve for positioning on the outer side of the connecting tube in the middle of the transmission shaft, and connects the ball sleeve with the support frame by arranging a plurality of damping telescopic rods to form a displaceable frame. During the adjustment of the spacing between the thread rolling rollers, each damping telescopic rod can be telescopically extended to dynamically position the middle of the transmission shaft, and the damping effect of the damping telescopic rod is used to support the middle of the transmission shaft, thereby reducing the vibration generated during the rotation of the transmission shaft, improving the processing quality of the thread rolling machine, and extending the service life of the transmission shaft and related connecting parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a first embodiment of the damping movable part of the present invention.

[0016] Figure 2 It is a schematic diagram of the transmission shaft structure of the present invention.

[0017] Figure 3 It is a schematic diagram of the plug-in structure of the split rod and the connecting pipe of the present invention.

[0018] Figure 4 It is a schematic diagram of the structure of the first damping telescopic rod of the present invention.

[0019] Figure 5 It is a schematic diagram of the cable trough distribution structure of the present invention.

[0020] Figure 6It is a schematic diagram of the gear swing adjustment structure of the present invention.

[0021] Figure 7 It is a structural schematic diagram of Embodiment 2 of the damping movable part of the present invention.

[0022] Figure 8 This is a schematic diagram of the structure of a second damping telescopic rod of the present invention.

[0023] Fig. 9 It is a structural schematic diagram of the thread rolling machine of the present invention.

[0024] Figure numerals: 1. connecting tube; 11. split rod; 12. spherical body; 13. sliding key rod; 2. ball bushing; 3. damping telescopic rod; 31. insert cylinder; 32. insert rod; 33. sliding plug; 34. embedded groove; 35. gear; 36. wire groove; 37. partition; 38. sphere; 39. T-shaped rod; 310. screw sleeve; 311. limit groove; 312. rotating frame; 313. variable volume chamber; 314. connecting tube; 4. support frame; 5. T-shaped block; 6. thread rolling roller; 7. driving shaft. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] like Fig. 9 As shown, the thread rolling machine is based on a frame, and two groups of thread rolling roller 6 components are symmetrically arranged on both sides of the front of the frame, and two groups of driving components are arranged on both sides of the rear of the frame. The thread rolling roller 6 components include a sliding body, a thread rolling roller 6, a motor and other components. The sliding body is installed on the surface of the frame for transverse sliding through a slide rail, and the thread rolling roller 6 is rotatably installed on the inner side of the sliding body. A threaded barrel is installed on the outer side of the sliding body, and the threaded barrel is threadedly connected to a threaded rod. The end of the threaded rod is rotatably connected to the side of the frame. The motor is connected to the threaded rod through a gear belt or a chain. The motor drives the threaded rod to rotate, and the sliding body is pushed by the thread to move laterally, which is used to synchronously adjust the distance between the two thread rolling rollers 6, and is suitable for cold pressing thread processing of metal rods of different sizes. The driving component includes a driving shaft 7 and a synchronous motor. The driving shaft 7 is rotatably installed on the surface of the frame. The synchronous motor is connected to the driving shaft 7 through a gear belt, a chain or a transmission. A transmission shaft is connected between the driving shaft 7 and the thread rolling roller 6 on the same side. The synchronous motor drives the driving shaft 7 to rotate, and the two thread rolling rollers 6 are driven by the transmission of the transmission shaft to rotate synchronously to perform thread processing on the metal rod.

[0027] Embodiment 1: Figure 2 , Figure 3As shown, the transmission shaft includes a connecting tube 1 arranged in the middle and split rods 11 arranged at both ends of the connecting tube 1. The end of the split rod 11 close to the connecting tube 1 has a sliding key rod 13. The split rod 11 is linearly inserted into the connecting tube 1 through the sliding key rod 13. The sliding key rod 13 is linearly adapted and plugged with the connecting tube 1, so that the two split rods 11 and the connecting tube 1 can rotate synchronously, and the length can be slidably changed. A universal joint is installed at the end of the split rod 11 away from the connecting tube 1. The two split rods 11 are respectively connected to the thread rolling roller 6 and the driving shaft 7 through the universal joint to realize power transmission, and the transmission angle can be adjusted to adapt to the opening and closing movement of the thread rolling roller 6. like Figure 1 As shown, the outside of the connecting tube 1 is integrally fixed with a spherical body 12, the ball sleeve 2 is sleeved on the outside of the spherical body 12, and the inside of the ball sleeve 2 is in contact with the spherical body 12 through a plurality of balls, so that the spherical body 12 can be stably adapted and rotated in the ball sleeve 2, a support frame 4 is installed on the frame surface of the thread rolling machine, two transmission shafts pass through the support frame 4, and the ball sleeve 2 is located at the support frame 4, and the ball sleeve 2 is connected to the support frame 4 through a damping movable part, so that the ball sleeve 2 can move in the plane of the support frame 4; like Figure 4 , Figure 5 As shown, the damping movable part includes four damping telescopic rods 3, which are cross-distributed. The two ends of the damping telescopic rods 3 are rotatably connected to the support frame 4 and the ball sleeve 2 through damping bearings respectively. The damping telescopic rod 3 includes a slidably inserted plug 31 and a plug rod 32. A sliding plug 33 is slidably arranged in the plug 31. The plug rod 32 is connected to the sliding plug 33. A plurality of embedded grooves 34 are annularly distributed around the edge of the sliding plug 33. A gear 35 is rotatably arranged in the embedded groove 34. A plurality of wire grooves 36 aligned with the gear 35 are annularly distributed around the inner wall of the plug 31. A rack is provided in the wire groove 36. The surface of the gear 35 protruding from the sliding plug 33 is inserted into the wire groove 36 and meshed with the rack. The plug 31 is filled with damping fluid. When the transmission shaft is transmitting, the connecting tube 1 in the middle is the part that is most likely to vibrate. The vibration is transmitted to the damping telescopic rod 3 through the ball sleeve 2, so that the insert tube 31 and the insert rod 32 have a tendency to slide and retract. When the insert rod 32 pushes the sliding plug 33 to displace in the insert tube 31, the space on both sides of the sliding plug 33 changes, and the damping fluid needs to be transmitted through the wire groove 36. When the damping fluid is transmitted through the wire groove 36, since the gear 35 and the rack in the wire groove 36 are in a meshing state, the transmission of the damping fluid is hindered. The movement of the sliding plug 33 causes the gear 35 to roll along the meshing rack. The transmission of the damping fluid is mainly through the gap between the gear 35 and the rack, which hinders the transmission of the damping fluid and brings a damping effect to the contraction of the insert rod 32 and the insert tube 31, supporting the connecting tube 1, effectively reducing the vibration of the connecting tube 1, making the power transmission of the transmission shaft more stable, and improving the processing quality of the thread rolling machine.

[0028] When the position of the thread rolling roller 6 is adjusted, the positions of the connecting tube 1 and the ball sleeve 2 will also change adaptively, and the four damping telescopic rods 3 will be adjusted accordingly. The damping fluid is transmitted along the meshing gap between the gear 35 and the rack, so that the plug rod 32 can move slowly and automatically balance the displacement of the transmission shaft.

[0029] like Figure 6 As shown, a rotating frame 312 is arranged in the embedded groove 34, one end of the rotating frame 312 is rotatably connected to the embedded groove 34 through a torsion spring, and a plurality of gears 35 are arranged and rotatably installed on the outer edge of the rotating frame 312, wherein the installation position of one gear 35 coincides with the rotation point of the rotating frame 312, so that the gear 35 always keeps meshing with the rack, and the inner side of the rotating frame 312 is in the shape of an inclined surface, and a ball 38 is arranged in the sliding plug 33, and the ball 38 abuts against the inclined surface of the rotating frame 312, and a T-shaped rod 39 is fixed to the ball 38, and the T-shaped rod 39 is rotatably inserted into the inside of the insertion rod 32, and a limiting groove 311 is provided on the surface of the insertion rod 32, and the end of the T-shaped rod 39 passes through the limiting groove 311, and a screw sleeve 310 is threadedly connected to the surface of the insertion rod 32, and the screw sleeve 310 abuts against the end of the T-shaped rod 39; By rotating the limit groove 311 to displace along the insertion rod 32, the T-shaped rod 39 is pushed to move, the position of the ball 38 against the rotating frame 312 is changed, the outward deflection angle of the rotating frame 312 is changed, and the number of gears 35 embedded in the wire groove 36 is adjusted, so that the resistance strength of the damping fluid passing through the wire groove 36 is changed, which is used to adjust the damping strength of the damping telescopic rod 3.

[0030] like Figure 4 As shown, a partition 37 is provided at the inner end of the insert cylinder 31 through a spring elastic sliding arrangement. The partition 37 moves in the insert cylinder 31 to change the capacity of the insert cylinder 31 to balance the pressure of the damping fluid in the insert cylinder 31.

[0031] Embodiment 2: Figure 7 As shown, the damping movable part includes two damping telescopic rods 3, and the ball sleeve 2 slides linearly left and right through the T-shaped block 5 and the support frame 4. The two damping telescopic rods 3 are symmetrically distributed on both sides of the T-shaped block 5. The damping telescopic rods 3 and the support frame 4 remain fixed. When the T-shaped block 5 moves, one damping telescopic rod 3 will be lengthened and the other damping telescopic rod 3 will be compressed. This method is different from the first embodiment in that: this embodiment is suitable for the situation where the height of the driving shaft 7 and the thread rolling roller 6 are the same, and only the position of the ball sleeve 2 needs to be adjusted left and right, and the height of the ball sleeve 2 will not change.

[0032] The damping telescopic rod 3 of this embodiment can adopt the structure of the first embodiment, or can adopt the following structure: like Figure 8As shown, the damping telescopic rod 3 includes an insert tube 31 and an insert rod 32. A sliding plug 33 is slidably arranged in the insert tube 31. The insert rod 32 is slidably inserted into the insert tube 31 and connected with the sliding plug 33. A variable volume cavity 313 is formed between the sliding plug 33 and the end of the insert tube 31. The variable volume cavities 313 of the two symmetrically distributed damping telescopic rods 3 are connected through a connecting pipe 314. When the ball sleeve 2 moves horizontally, the two symmetrical damping telescopic rods 3 extend and shorten by the same distance, and the variable volume chambers 313 inside them change by the same amount, that is, the total volume of the two variable volume chambers 313 remains unchanged, and only the damping fluid is conducted along the connecting tube 314 between the two variable volume chambers 313, so that the damping telescopic rod 3 has a damping effect.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transmission shaft, characterized in that: The invention comprises a connecting tube (1) and a split rod (11) arranged at both ends of the connecting tube (1), wherein a sliding key rod (13) and a universal joint are respectively arranged at both ends of the split rod (11), and the split rod (11) is linearly inserted into the connecting tube (1) through the sliding key rod (13). The connecting tube (1) has a spherical body (12) on the outside, and a ball shaft sleeve (2) is rotatably sleeved on the outside of the spherical body (12). The ball shaft sleeve (2) is connected to a support frame (4) via a damping movable part, so that the ball shaft sleeve (2) can move within the plane of the support frame (4).

2. The transmission shaft according to claim 1, characterized in that: The damping movable part comprises four damping telescopic rods (3), the four damping telescopic rods (3) are cross-distributed, and the two ends of the damping telescopic rods (3) are rotatably connected to the support frame (4) and the ball shaft sleeve (2).

3. The transmission shaft according to claim 2, characterized in that: The two ends of the damping telescopic rod (3) are rotatably connected to the support frame (4) and the ball sleeve (2) respectively through damping bearings.

4. The transmission shaft according to claim 1, characterized in that: The damping movable part comprises two damping telescopic rods (3), the ball shaft sleeve (2) slides linearly left and right through the T-shaped block (5) and the support frame (4), the two damping telescopic rods (3) are symmetrically distributed linearly on both sides of the T-shaped block (5), and when the T-shaped block (5) moves, one damping telescopic rod (3) is stretched and the other damping telescopic rod (3) is compressed.

5. The transmission shaft according to claim 2 or 4, characterized in that: The damping telescopic rod (3) comprises an insert cylinder (31) and an insert rod (32); a sliding plug (33) is slidably arranged in the insert cylinder (31); the insert rod (32) is slidably inserted into the insert cylinder (31) and connected to the sliding plug (33); a plurality of embedded grooves (34) are annularly distributed on the edge of the sliding plug (33); a gear (35) is rotatably arranged in the embedded groove (34); a plurality of wire grooves (36) are annularly distributed on the inner wall of the insert cylinder (31); a rack is arranged in the wire groove (36); the gear (35) protrudes from the surface of the sliding plug (33) and is inserted into the wire groove (36) to mesh with the rack; the insert cylinder (31) is filled with damping fluid.

6. The transmission shaft according to claim 5, characterized in that: A rotating frame (312) is arranged in the embedded groove (34), one end of the rotating frame (312) is rotatably connected to the embedded groove (34) via a torsion spring, a plurality of gears (35) are arranged and rotatably mounted on the outer edge of the rotating frame (312), the inner side of the rotating frame (312) is in the shape of an inclined surface, a ball (38) is arranged in the sliding plug (33), the ball (38) abuts against the inclined surface of the rotating frame (312), a T-shaped rod (39) is fixed to the ball (38), the T-shaped rod (39) is rotatably inserted into the inside of the insertion rod (32), a limiting groove (311) is provided on the surface of the insertion rod (32), an end of the T-shaped rod (39) is inserted through the limiting groove (311), a threaded sleeve (310) is threadedly connected to the surface of the insertion rod (32), and the threaded sleeve (310) abuts against the end of the T-shaped rod (39).

7. The transmission shaft according to claim 5, characterized in that: The inner end of the insert tube (31) is provided with a partition plate (37) via spring elastic sliding.

8. The transmission shaft according to claim 4, characterized in that: The damping telescopic rod (3) comprises an insert tube (31) and an insert rod (32); a sliding plug (33) is slidably arranged in the insert tube (31); the insert rod (32) is slidably inserted into the insert tube (31) and connected to the sliding plug (33); a variable volume cavity (313) is formed between the sliding plug (33) and the end of the insert tube (31); and the variable volume cavities (313) of the two symmetrically distributed damping telescopic rods (3) are connected via a connecting pipe (314).

9. A thread rolling machine for a transmission shaft according to any one of claims 1 to 8, characterized in that: It comprises two symmetrically distributed thread rolling rollers (6) and two drive shafts (7) driven by synchronous motors, the two drive shafts being respectively arranged between the thread rolling rollers (6) and the drive shafts (7) on both sides, and the universal joints at both ends of the drive shafts respectively connecting the thread rolling rollers (6) and the drive shafts (7).

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