CN112974967A

CN112974967A - Linkage type pipe cutting machine based on forward and reverse rotation separation driving and pipe cutting method thereof

Info

Publication number: CN112974967A
Application number: CN202110198232.2A
Authority: CN
Inventors: 迟晓妮; 吴秋轩
Original assignee: Hangzhou Xinneng Zhilian Technology Co ltd; Hangzhou Vocational and Technical College
Current assignee: Hangzhou Xinneng Zhilian Technology Co ltd; Hangzhou Vocational and Technical College
Priority date: 2021-02-22
Filing date: 2021-02-22
Publication date: 2021-06-18
Anticipated expiration: 2041-02-22
Also published as: CN112974967B

Abstract

The invention discloses a linkage pipe cutting machine based on forward and reverse rotation separation driving and a pipe cutting method thereof. The pipe cutting machine comprises a workbench, a conveying mechanism, a clamping mechanism, a cutting mechanism, an auxiliary supporting assembly, a linkage type driving mechanism, a blanking groove body and a controller. The conveying mechanism, the clamping mechanism and the cutting mechanism are all installed on the workbench. The output position of the transport mechanism is aligned with the input position of the clamping mechanism. The cutting mechanism is located on one side of the clamping mechanism. The blanking groove body is arranged at the output end of the workbench. One or more auxiliary supporting components are arranged between the blanking groove body and the clamping mechanism. The linkage type driving mechanism comprises a crankshaft, a cutting transmission connecting rod and a clamping cam. The crankshaft is supported on the workbench. And the crank part on the crankshaft is connected with the cutting mechanism through a cutting transmission connecting rod. The two clamping cams arranged side by side are fixed on the crankshaft and are respectively contacted with the push plates on the two clamping units in the clamping mechanism.

Description

Linkage type pipe cutting machine based on forward and reverse rotation separation driving and pipe cutting method thereof

Technical Field

The invention belongs to the technical field of pipe cutting equipment, and particularly relates to a linkage type pipe cutting machine based on forward and reverse rotation separation driving and a pipe cutting method thereof.

Background

In the process of processing the pipe, the formed pipe needs to be cut. The existing pipe cutting machine needs independent motors for pipe conveying, clamping and saw blade feeding, the control process is very complex, and the cost is high. Therefore, it is necessary to design a pipe cutting apparatus capable of driving a plurality of pipe cutting actions by a single motor, thereby reducing the cost of the pipe cutting apparatus.

Disclosure of Invention

The invention aims to provide a linkage type pipe cutting machine based on forward and reverse rotation separation driving and a pipe cutting method thereof.

The invention relates to a linkage type pipe cutting machine based on forward and reverse rotation separation driving, which comprises a workbench, a conveying mechanism, a clamping mechanism, a cutting mechanism, an auxiliary supporting assembly, a linkage type driving mechanism, a blanking groove body and a controller. The conveying mechanism, the clamping mechanism and the cutting mechanism are all installed on the workbench. The output position of the transport mechanism is aligned with the input position of the clamping mechanism. The cutting mechanism is located on one side of the clamping mechanism. The blanking groove body is arranged at the output end of the workbench. One or more auxiliary supporting components are arranged between the blanking groove body and the clamping mechanism.

The conveying mechanism is provided with a main supporting roller and a lower pressing wheel. The conveyed pipe is pressed between the main supporting roller and the lower pressing wheel. The main support roller or the lower pressure wheel detects the rotation angle through an encoder. The pipe is conveyed by the rotation of the main supporting roller or the lower pressing wheel.

The cutting mechanism comprises a cutting rotating frame, a cutting motor and a saw blade. The bottom of the cutting rotating frame and the workbench form a rotating pair. The cutting motor is fixed on the cutting rotating frame. The output shaft of the cutting motor is fixed with the saw blade. The cutting rotating frame is driven by the linkage type driving mechanism to overturn up and down in a reciprocating manner.

The clamping mechanism comprises a bottom plate and two clamping units. The bottom plate is fixed on the workbench. The two clamping units are arranged on the bottom plate side by side at intervals. The two clamping units are respectively positioned at two sides of the saw blade in the cutting mechanism. The two clamping units have the same structure and respectively comprise a clamping base, a fixed clamping block, a sliding clamping block, a connecting column, a second spring, a sliding sleeve and a push plate. The clamping base is fixed on the bottom plate. The fixed clamping block is fixed at one end of the clamping base. The sliding clamping block and the clamping base form a sliding pair. The side surface of the sliding clamping block, which is far away from the fixed clamping block, is fixed with a connecting column. The connecting column is connected with a sliding sleeve in a sliding way. The connecting column is sleeved with a second spring. Two ends of the second spring respectively abut against the sliding sleeve and the sliding clamping block. The outer end of the sliding sleeve is fixed with a push plate. The push plate is pushed by a linkage type driving mechanism.

The linkage type driving mechanism comprises a crankshaft, a cutting transmission connecting rod and a clamping cam. The crankshaft is supported on the workbench through a bearing seat. A crank portion on the crankshaft is aligned with the cutting mechanism. One end of the cutting transmission connecting rod and a connecting rod journal of a crank part on the crankshaft form a rotating pair. The other end of the cutting transmission connecting rod and the cutting rotating frame form a rotating pair. The two clamping cams arranged side by side are fixed on the crankshaft and are respectively contacted with the push plates on the two clamping units in the clamping mechanism.

When the cutting rotating frame is at the upper limit position, two clamping units in the clamping mechanism are in a released state. When the cutting rotating frame is at the lower limit position, the clamping cam pushes the push plate in the clamping unit, so that the clamping unit is in a clamping state.

Preferably, the linkage type driving mechanism further comprises a driving motor, a driving shaft, a first double-ratchet wheel linkage assembly, a second double-ratchet wheel linkage assembly and a conveying transmission assembly. The first double-ratchet wheel linkage assembly and the second double-ratchet wheel linkage assembly respectively comprise a first ratchet wheel and pawl mechanism, a second ratchet wheel and pawl mechanism, a sleeve and a locking support. The locking support is fixed on the workbench. The locking support is fixed on the workbench. The sleeve is supported on the capture abutment. The drive shaft is supported in the sleeve. The first ratchet-pawl mechanism is arranged between the sleeve and the cylinder at the top of the locking support. The second ratchet-pawl mechanism is arranged between the driving shaft and the sleeve. The direction in which the drive shaft allows rotation relative to the sleeve is opposite to the direction in which the sleeve allows rotation relative to the capture abutment. The driving shaft is driven to rotate by a driving motor. The direction in which the sleeve in the first dual ratchet linkage assembly allows rotation relative to the capture abutment is opposite to the direction in which the sleeve in the second dual ratchet linkage assembly allows rotation relative to the capture abutment. The main supporting roller and the sleeve in the first double-ratchet wheel linkage assembly are driven by the conveying transmission assembly. The sleeve in the second double-ratchet wheel linkage assembly is connected with the crankshaft.

Preferably, the first ratchet-pawl mechanism comprises a first ratchet, a first pawl and a torsion spring. The first ratchet wheel is fixed on the outer circumferential surface of the sleeve. The ratchet ring of the first ratchet wheel is located in the outer side of the ratchet ring. One end of one or more first pawls is hinged with the inner cavity of the cylinder on the locking support, and the other end of the one or more first pawls abuts against the ratchet ring outside the first ratchet wheel. A torsion spring is arranged between each first pawl and the locking support; the torsion spring provides the first pawl with an elastic force against the ratchet ring outside the first ratchet wheel.

Preferably, the second ratchet-pawl mechanism comprises a bushing, a second ratchet, a second pawl and a spring. The shaft sleeve is connected with the driving shaft through a spline; the second ratchet wheel is fixed on the inner side of the sleeve. The ratchet ring of the second ratchet wheel is positioned in the central hole of the ratchet ring. A plurality of second pawls are evenly distributed along the circumferential direction of the outer side surface of the shaft sleeve. The inner end of each second pawl is hinged with the shaft sleeve, and the outer end of each second pawl is propped against the ratchet ring at the inner side of the second ratchet wheel. Springs are arranged between the second pawls and the shaft sleeve; the spring provides the second pawl with a spring force against the ratchet ring inside the second ratchet wheel.

Preferably, the conveying mechanism comprises a conveying frame, a main supporting roller, a pressing assembly and an encoder. The conveying frame is fixed on the workbench. One or more primary support rollers are supported on the carriage. And a guide hole for passing through the pipe is formed in the vertical side plate in the conveying frame. The bottom of the guide hole is aligned with the top of the main support drum. The pressing assembly comprises a first guide pillar, a first spring, a lower pressing frame and a lower pressing wheel. The first guide pillar of vertical setting is fixed with the top of carriage. The lower pressing frame and the first guide post form a sliding pair. The first guide post is sleeved with a first spring. Two ends of the first spring respectively abut against the conveying frame and the lower pressing frame. The lower pressing wheel is supported at the top of the lower pressing frame. The lower pressure roller is positioned right above one of the main supporting rollers. And a side mounting plate is fixed at the side part of the conveying frame. The casing of the encoder is fixed on the side mounting plate. The input shaft of the encoder is fixed with the lower pressing wheel.

Preferably, the cutting mechanism further comprises a counterweight. The counterweight block is fixed on one side of the cutting rotating frame far away from the cutting motor. The counterweight blocks enable the center of gravity of the whole cutting mechanism to be on the axis of the pin shaft between the cutting rotating frame and the workbench.

Preferably, the inner cavity of the blanking groove body is provided with an inclined guide surface and a horizontal bottom surface. And a blanking limiting notch is formed in the side plate of the blanking groove body close to each auxiliary supporting assembly. The blanking limiting notch is positioned at the top of the inclined guide surface. The blanking limiting notch is aligned with the pipe conveyed by the conveying mechanism.

Preferably, the working profile of the clamping cam comprises a large-diameter section, a small-diameter section and two transition sections. The two ends of the large-diameter section are smoothly connected with the two ends of the small-diameter section through two transition sections respectively. The large diameter section covers a circumferential angle greater than or equal to 180 °. When the small diameter sections of the working profiles of the two clamping cams are in contact with the corresponding push plates, the clamping mechanisms are in a loosened state; when the large-diameter sections of the working profiles of the two clamping cams are in contact with the corresponding push plates, the clamping mechanisms are in a clamping state; when the cutting turret moves down to the point where the saw blade contacts the tubing, the large diameter section of the working profile of the clamping cam has moved against the push plate. When the cutting rotating frame moves upwards to separate the saw blade from the pipe, the large-diameter section of the working profile of the clamping cam is still in a state of abutting against the push plate.

Preferably, an epicyclic sensor is provided between the crankshaft and the table. The turnover sensor comprises a contact piece and a photoelectric sensor. One end of the contact piece is fixed with the end part of the crankshaft. The photoelectric sensor is fixed on one of the bearing seats and corresponds to the position of the contact piece. When the cutting rotating frame is at the upper limit position, the contact pieces are aligned with the photoelectric sensor.

Preferably, the auxiliary support assembly comprises an auxiliary frame and an auxiliary support roller. The auxiliary frame is fixed on the workbench. The auxiliary supporting roller is supported on the top of the auxiliary frame.

Preferably, an elastic layer is arranged on the outer circumferential surface of the lower pressing wheel.

Preferably, the clamping claws are detachably fixed on opposite side surfaces of the fixed clamping block and the sliding clamping block. The opposite side surfaces of the clamping claws are provided with grooves corresponding to the external size of the cut pipe.

Preferably, the conveying transmission assembly comprises a first bevel gear and a second bevel gear. The first bevel gear is coaxially fixed with the main conveying roller corresponding to the lower pinch roller. The second bevel gear is fixed with a sleeve in the first double-ratchet wheel linkage component. The first bevel gear is meshed with the second bevel gear.

The linkage type pipe cutting machine based on forward and reverse rotation separation driving and the pipe cutting method thereof are as follows:

step one, the end part of the pipe is arranged in the conveying mechanism and penetrates through two clamping units in the clamping mechanism. At the moment, the pipe is positioned between the lower pressing wheel and the corresponding main supporting roller.

And step two, driving the motor to rotate positively, so that the driving shaft drives the corresponding main supporting wheel to rotate through the first double-ratchet wheel linkage assembly. The main supporting wheel drives the pipe to move towards the lower trough body in the rotating process. At this time, the crankshaft is locked by the second double-ratchet linkage assembly in the rotation direction and is kept stationary. The lower pressing wheel is driven to rotate in the moving process of the pipe; the encoder detects the rotating angle of the lower pinch roller. And calculating the length of the conveyed pipe according to the rotating angle of the lower pressing wheel and the diameter of the lower pressing wheel.

Step three, when the length of the pipe conveyed reaches a preset value; the controller controls the driving motor to rotate reversely, so that the driving shaft drives the crankshaft to rotate through the second double-ratchet wheel linkage assembly. The second bevel gear is locked by the first dual ratchet linkage assembly in the direction of rotation and remains stationary.

In the process of crankshaft rotation, the clamping cam is driven to rotate firstly, so that the clamping mechanism clamps the pipe, and the cutting rotating frame is driven to overturn downwards to enable the saw blade to cut the pipe. After the pipe is cut off, the crankshaft drives the cutting rotating frame to turn upwards and reset, and the clamping cam rotates, so that the clamping mechanism clamps the pipe. After the crankshaft rotates 360 degrees, the driving motor starts to rotate forwards again. And entering the step four.

And step four, repeatedly executing the step two and the step three. And continuous cutting of the pipe is realized. In the process of conveying the pipes, the later section of pipe pushes the cut-off previous section of pipe to completely enter the blanking groove body.

The invention has the beneficial effects that:

1. the first double-ratchet wheel linkage assembly and the second double-ratchet wheel linkage assembly are matched by an inner ratchet wheel pawl mechanism and an outer ratchet wheel pawl mechanism, forward rotation and reverse rotation of a driving shaft are separated, forward rotation is transmitted to a main supporting roller to realize conveying of a pipe, and reverse rotation is transmitted to a clamping mechanism and a cutting mechanism to realize clamping and cutting of the pipe. Compared with the technical scheme of multi-motor matching in the prior art, the technical scheme of single motor multiplexing has the advantages of simpler control and lower cost.

2. According to the invention, the crankshaft is matched with the crank rocker mechanism to drive the cutting rotating frame to rotate up and down in a reciprocating manner, and the crankshaft is matched with the cam to drive the clamping mechanism to be loosened and tightened. The clamping of the pipe during the cutting process is very reliable, since the cam has caused the clamping mechanism to clamp completely before the blade contacts the pipe.

3. The blanking groove body further guides the cut pipe by utilizing the blanking limiting notch, so that the cut pipe can stably and reliably enter the blanking groove body under the pushing of the subsequent pipe; in addition, the inclined guide surface in the blanking groove body can realize the transfer of the pipes, and the blockage of a plurality of pipes at the blanking limiting notch is avoided.

4. The clamping mechanism is provided with two clamping units which are respectively arranged on two sides of the saw blade to respectively clamp the two sections of cut pipes, so that the pipes can be effectively prevented from moving in the cutting process, and the pipe cutting precision is obviously improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of a blanking chute body in the invention.

Fig. 3 is a schematic view of the conveying mechanism of the present invention.

Fig. 4 is a first perspective view of the hidden blanking slot of the present invention.

Fig. 5 is a second perspective view of the hidden blanking slot of the present invention.

Fig. 6 is a schematic top view of the hidden blanking chute of the present invention.

Fig. 7 is a schematic view of a clamping mechanism of the present invention.

FIG. 8 is a schematic view of a first dual ratchet linkage assembly according to the present invention.

FIG. 9 is a schematic view of a second dual ratchet linkage assembly according to the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1, a linkage type pipe cutting machine based on forward and reverse rotation separation driving comprises a workbench 1, a conveying mechanism 2, a clamping mechanism 3, a cutting mechanism 4, an auxiliary supporting assembly 5, a linkage type driving mechanism 6, a blanking groove body 7 and a controller. The conveying mechanism 2, the clamping mechanism 3 and the cutting mechanism 4 are all arranged on the workbench 1. The output position of the transport mechanism 2 is aligned with the input position of the clamping mechanism 3. The cutting mechanism 4 is located on one side of the clamping mechanism 3. The blanking groove body 7 is arranged at the output end of the workbench 1. Three auxiliary supporting components 5 which are sequentially arranged at intervals are arranged between the blanking groove body 7 and the clamping mechanism 3. The auxiliary support assembly 5 includes an auxiliary frame and an auxiliary support roller. The auxiliary frame is fixed on the workbench 1. The auxiliary supporting roller is supported on the top of the auxiliary frame. The auxiliary supporting component 5 is used for supporting the pipe 12 between the clamping mechanism 3 and the blanking groove body 7.

As shown in figure 2, the inner cavity of the blanking groove body 7 is provided with an inclined guide surface 7-1 and a horizontal bottom surface 7-2. The inclined direction of the inclined guide surface 7-1 is perpendicular to the pipe conveying direction, so that the pipe can slide onto the horizontal opposite surface 7-2 along the radial direction of the pipe. The blanking groove body 7 is provided with a blanking limit notch 7-3 on the side plate close to each auxiliary supporting component 5. The blanking limiting notch 7-3 is positioned at the top of the inclined guide surface 7-1. The blanking limiting notch 7-3 is aligned with the pipe 12 conveyed by the conveying mechanism 2; after the pipe 12 is cut off, the pipe can be pushed into the blanking limiting notch 7-3 by the subsequent pipe 12 along the blanking limiting notch 7-3 and rolls to the horizontal bottom surface 7-2 along the inclined guide surface 7-1 for storage, so that the continuous pipe cutting is realized.

As shown in fig. 3, the conveying mechanism 2 includes a conveying frame 2-1, a main support roller 2-2, a pressing assembly, and an encoder 2-3. The conveying frame 2-1 is fixed on the workbench 1. Two main support rollers 2-2 arranged in sequence are supported on the conveyor frame 2-1. A guide hole for passing through the pipe 12 is arranged on a vertical side plate in the conveying frame 2-1. The bottom of the guide hole is aligned with the top of the main support drum 2-2 so that the main support drum 2-2 can provide reliable support for the incoming tubular 12. The pressing assembly comprises a first guide post 2-4, a first spring 2-5, a lower pressing frame 2-6 and a lower pressing wheel 2-7. The top ends of two first guide columns 2-4 which are vertically arranged are fixed with the top of the conveying frame 2-1. The lower pressing frame 2-6 and the two first guide posts 2-4 form a sliding pair through guide sleeves. The two first guide posts 2-4 are sleeved with first springs 2-5. Two ends of the first spring 2-5 respectively abut against the conveying frame 2-1 and the lower pressing frame 2-6 to provide pressing elasticity for the lower pressing frame 2-6. The lower press wheels 2-7 are supported on the top of the lower press frames 2-6 through a central shaft. An elastic layer is arranged on the outer circumference of the lower pinch roller 2-7. The lower pinch rollers 2-7 are fixed with the central shaft. The material of the elastic layer is preferably rubber. The lower pinch roller 2-7 is positioned right above one of the main supporting rollers 2-2. The lower pinch rollers 2-7 apply pressure to the pipe 12, so that the pipe 12 is prevented from slipping when the supporting wheels rotate, and the pipe 12 can be conveyed stably by the rotation of the supporting wheels. The main conveying roller corresponding to the lower pinch rollers 2-7 is driven to rotate by a linkage type driving mechanism 6. The side part of the conveying frame 2-1 is fixed with a side mounting plate. The casing of the encoder 2-3 is fixed to the side mounting plate. The input shaft of the encoder 2-3 is fixed with the central shaft of the lower pinch roller 2-7.

As shown in fig. 4, 5 and 6, the cutting mechanism 4 includes a cutting turret 4-1, a cutting motor 4-2, a saw blade 4-3, a protective cover 4-4 and a counterweight 4-5. The bottom of the cutting rotating frame 4-1 and the workbench 1 form a rotating pair through a pin shaft and a hinge seat. A cutting motor 4-2 with a speed reducer is fixed on the cutting rotating frame 4-1. The output shaft of the cutting motor 4-2 is fixed with the saw blade 4-3. The protective cover 4-4 is fixed on the cutting turret 4-1 and covers the saw blade 4-3. The balance weight 4-5 is fixed on one side of the cutting rotating frame 4-1 far away from the cutting motor 4-2. The balancing weights enable the center of gravity of the whole cutting mechanism 4 to be on the axis of the pin shaft between the cutting rotating frame 4-1 and the workbench 1, so that the cutting rotating frame 4-1 is prevented from being driven to turn over by gravity, and the linkage type driving mechanism 6 is ensured to stably drive the cutting rotating frame 4-1 to rotate. The cutting rotating frame 4-1 is driven by the linkage type driving mechanism 6 to turn up and down in a reciprocating way.

As shown in fig. 7, the clamping mechanism 3 includes a base plate 3-1 and two clamping units. The bottom plate 3-1 is fixed on the workbench 1. The two clamping units are arranged on the bottom plate 3-1 side by side and at intervals. The two clamping units are respectively positioned at two sides of the saw blade 4-3 in the cutting mechanism 4 and are respectively used for clamping the input pipe 12 and the cut-off pipe 12, so that the pipe 12 is prevented from moving in the cutting process. The arrangement direction of the two clamping unit structures is the same as the conveying direction of the pipe 12. The two clamping units have the same structure and respectively comprise a clamping base 3-2, a fixed clamping block 3-3, a sliding clamping block 3-4, a clamping claw 3-5, a second guide pillar 3-6, a connecting column 3-7, a second spring 3-8, a sliding sleeve 3-9 and a push plate 3-10. The clamping base 3-2 is fixed on the bottom plate 3-1. The fixed clamping block 3-3 is fixed at one end of the clamping base 3-2. The sliding clamping block 3-4 and a second guide post 3-6 horizontally fixed on the clamping base 3-2 form a sliding pair. The opposite side surfaces of the fixed clamping block 3-3 and the sliding clamping block 3-4 are detachably fixed with clamping claws 3-5. The opposite side surfaces of the clamping claws 3 to 5 are provided with grooves corresponding to the external dimension of the cut pipe 12. The pipe 12 with different sizes can be adapted by replacing the clamping claws 3-5 with different groove sizes. Connecting columns 3-7 are fixed on the side surfaces of the sliding clamping blocks 3-4 far away from the fixed clamping blocks 3-3. The connecting columns 3-7 are connected with sliding sleeves 3-9 in a sliding way. The connecting column 3-7 is sleeved with a second spring 3-8. Two ends of the second spring 3-8 respectively support against the sliding sleeve 3-9 and the sliding clamping block 3-4. A push plate 3-10 is fixed on the outer side surface of the sliding sleeve 3-9. The sliding sleeve 3-9 can compress the second spring 3-8 by pushing the push plate 3-10, and pressure for clamping the pipe 12 is provided for the sliding clamping block 3-4. The push plates 3-10 are pushed by a linkage type driving mechanism 6. The grooves of the two clamping claws 3-5 in the clamping unit are aligned with the guide holes on the conveying frame 2-1.

As shown in figures 4, 5 and 6, the linkage type driving mechanism 6 comprises a motor bracket 6-1, a driving motor 6-2, a driving shaft 6-3, a first double-ratchet wheel linkage assembly 6-4, a second double-ratchet wheel linkage assembly 6-5, a conveying transmission assembly 6-6, a crankshaft 6-7, a cutting transmission connecting rod 6-8, a clamping cam 6-9 and an epicyclic sensor 6-10. The first double-ratchet linkage assembly 6-4 and the second double-ratchet linkage assembly 6-5 respectively comprise a first ratchet-pawl mechanism 8, a second ratchet-pawl mechanism 9, a sleeve 10 and a locking support 11. The locking support 11 is fixed on the workbench 1. The sleeve 10 is bearing supported in a cylinder at the top of the capture abutment 11. The drive shaft 6-3 is supported in the sleeve 10 by bearings. The first ratchet-pawl mechanism 8 is arranged between the sleeve 10 and the cylinder at the top of the capture abutment 11. The second ratchet-pawl mechanism 9 is arranged between the axle shaft 6-3 and the sleeve 10. The first ratchet-pawl mechanism 8 enables only one-directional rotation of the sleeve 10 relative to the capture abutment 11. The second ratchet-pawl mechanism 9 enables the drive shaft 6-3 to rotate only in one direction relative to the sleeve 10. The direction in which the axle shaft 6-3 is allowed to rotate relative to the sleeve 10 is opposite to the direction in which the sleeve 10 is allowed to rotate relative to the capture abutment 11. The motor bracket 6-1 is fixed on the workbench 1; the driving motor 6-2 is fixed on the motor support 6-1, and the output shaft is fixed with the end part of the driving shaft 6-3 through a coupler.

As shown in fig. 8 and 9, the direction in which the sleeve 10 can rotate relative to the capture abutment 11 is referred to as an effective steering, and the direction in which the sleeve 10 is locked relative to the capture abutment 11 is referred to as an ineffective steering; when the driving shaft 6-3 rotates along the effective steering direction, the sleeve 10 and the driving shaft 6-3 are locked by the second ratchet-pawl mechanism 9, and the sleeve 10 rotates along with the driving shaft 6-3. When the driving shaft 6-3 rotates along the invalid steering direction, the driving shaft 6-3 is locked by the first ratchet wheel and pawl mechanism 8, and the driving shaft 6-3 alone can not drive the sleeve 10.

The direction in which the sleeve 10 of the first dual ratchet linkage assembly 6-4 is allowed to rotate relative to the capture abutment 11 is opposite to the direction in which the sleeve 10 of the second dual ratchet linkage assembly 6-5 is allowed to rotate relative to the capture abutment 11. Thus, the effective rotation of the sleeve 10 in the first and second dual ratchet linkage assemblies 6-4 and 6-5 is also reversed. Therefore, when the driving shaft 6-3 rotates forwards, the sleeve 10 in the first double-ratchet linkage assembly 6-4 is driven to rotate forwards, and the sleeve 10 in the second double-ratchet linkage assembly 6-5 is kept static. When the driving shaft 6-3 rotates reversely, the sleeve 10 in the second double-ratchet wheel linkage assembly 6-5 is driven to rotate forwards, and the sleeve 10 in the first double-ratchet wheel linkage assembly 6-4 keeps static. Therefore, the positive rotation and the reverse rotation of the driving shaft 6-3 are separated and transmitted to different driven parts, and the multiplexing of a single motor is realized.

As shown in fig. 8 and 9, the first ratchet-pawl mechanism 8 includes a first ratchet 8-1, a first pawl 8-2, and a torsion spring 8-3. The first ratchet 8-1 is fixed on the outer circumferential surface of the sleeve 10. The ratchet ring of the first ratchet wheel 8-1 is located in the outer side of itself. One end of one or more first pawls 8-2 is hinged with the inner cavity of the cylinder on the locking support 11, and the other end abuts against a ratchet ring outside the first ratchet wheel 8-1. A torsion spring 8-3 is arranged between each first pawl 8-2 and the locking support 11; the torsion spring 8-3 provides the first pawl 8-2 with a spring force against the ratchet ring outside the first ratchet wheel 8-1. The first ratchet wheel 8-1 can rotate only in one direction relative to the capture abutment 11 under the restriction of the first pawl 8-2.

The second ratchet-pawl mechanism 9 comprises a shaft sleeve 9-1, a second ratchet 9-2, a second pawl 9-3 and a spring 9-4. The shaft sleeve 9-1 is connected with the driving shaft 6-3 through a spline; the second ratchet wheel 9-2 is fixed inside the sleeve 10. The ratchet ring of the second ratchet wheel 9-2 is positioned in the central hole of the ratchet ring. A plurality of second pawls 9-3 are uniformly distributed along the circumferential direction of the outer side surface of the sleeve 9-1. The inner end of each second pawl 9-3 is hinged with the shaft sleeve 9-1, and the outer end of each second pawl is propped against the ratchet ring at the inner side of the second ratchet wheel 9-2. Springs 9-4 are arranged between the second pawls 9-3 and the shaft sleeve 9-1; the spring 9-4 adopts a pressure spring to provide the second pawl 9-3 with the elastic force of the ratchet ring which is propped against the inner side of the second ratchet wheel 9-2. The second ratchet wheel 9-2 can rotate only in one direction relative to the driving shaft 6-3 under the restriction of the second pawl 9-3.

As shown in fig. 4, 5 and 6, the feed drive assembly 6-6 includes a first bevel gear and a second bevel gear. The first bevel gear is coaxially fixed with the main conveying roller corresponding to the lower pinch roller 2-7. The second bevel gear is fixed to a sleeve 10 in the first dual ratchet linkage assembly 6-4. The first bevel gear is meshed with the second bevel gear. The crankshaft 6-7 is supported on the workbench 1 through a bearing seat and is coaxially arranged with the driving shaft 6-3. One end of the crankshaft 6-7 is fixed with the end of the inner sleeve 10 of the second double ratchet linkage assembly 6-5 through a flange. The crank portions on the crankshafts 6-7 are aligned with the cutting mechanism 4. One end of the cutting transmission connecting rod 6-8 and a connecting rod journal of a crank part on the crankshaft 6-7 form a rotating pair. The other end of the cutting transmission connecting rod 6-8 and a pin shaft at the top of the cutting rotating frame 4-1 form a rotating pair. Two clamping cams 6-9 arranged side by side are fixed on the crankshafts 6-7 and are respectively contacted with push plates 3-10 on two clamping units in the clamping mechanism 3 to push the two clamping units to synchronously clamp and release. The working profile of the clamping cams 6-9 comprises a large-diameter section, a small-diameter section and two transition sections. The two ends of the large-diameter section are smoothly connected with the two ends of the small-diameter section through two transition sections respectively. The large diameter section covers a circumferential angle greater than or equal to 180 °. When the small diameter sections of the working profiles of the two clamping cams 6-9 are contacted with the corresponding push plates 3-10, the clamping mechanism 3 is in a loose state; when the large-diameter sections of the working profiles of the two clamping cams 6-9 are in contact with the corresponding push plates 3-10, the clamping mechanism 3 is in a clamping state; the push plates 3-10 can be driven to move by the rotation of the clamping cams 6-9, so that the clamping mechanism 3 is driven.

The epicyclic sensors 6-10 comprise contact pads and photosensors. One end of the contact piece is fixed with the end part of the crankshaft 6-7. The photoelectric sensor is fixed on one of the bearing seats and corresponds to the position of the contact piece. The photoelectric sensor will be triggered once every time the contact piece rotates one circle. When the cutting turret 4-1 is in the upper limit position, the contact pads are aligned with the photosensors. Each time the photoelectric sensor detects a contact, it indicates the upper limit position to which the cutting turret 4-1 is returned, in which the crank-rocker mechanism formed by the cutting turret 4-1, the cutting transmission link 6-8 and the crank portion of the crankshaft 6-7 reaches the dead-center position, in which the force exerted on the cutting turret 4-1 cannot produce a torque on the crankshaft 6-7, thus ensuring the stability and reliability of the crankshaft 6-7 during transport.

When the cutting rotating frame 4-1 is at the upper limit position, the clamping mechanism 3 is in a loose state when the small diameter sections of the working profiles of the two clamping cams 6-9 are both contacted with the push plate 3-10. When the cutting rotating frame 4-1 is at the lower limit position, the clamping mechanism 3 is in a clamping state when the large-diameter section of the working profile of the clamping cam 6-9 is contacted with the push plate 3-10. When the cutting turret 4-1 is moved down until the saw blade 4-3 comes into contact with the tube 12, the large diameter section of the working profile of the clamping cam 6-9 has moved against the push plate 3-10. When the cutting rotating frame 4-1 moves upwards until the saw blade 4-3 is separated from the pipe 12, the large-diameter section of the working profile of the clamping cam 6-9 is still in a state of abutting against the push plate 3-10. Thereby ensuring that the tube 12 is clamped stably and reliably during the cutting process.

Therefore, the linkage process of the clamping mechanism 3 and the cutting mechanism 4 is as follows: the crankshaft 6-7 rotates for one circle under the driving of the sleeve 10 in the first double-ratchet linkage assembly 6-4; the clamping mechanism 3 is driven by the clamping cam 6-9 to clamp the pipe 12 so as to ensure the stability of the cutting process, and meanwhile, the cutting rotating frame 4-1 is turned downwards so that the saw blade 4-3 cuts the pipe 12; the saw blade 4-3 starts to move upwards after moving to the lower limit position; when the saw blade 4-3 is separated from the pipe 12, the small diameter sections of the two clamping cams 6-9 rotate to a state of abutting against the push plate 3-10, so that the two clamping units in the clamping mechanism 3 respectively loosen the two cut parts of the pipe 12.

step one, the end of the pipe 12 is passed through a guide hole on the carriage 2-1 and through two clamping units in the clamping mechanism 3, so that the end of the pipe 12 is aligned with the saw blade 4-3. At this time, the lower pinch rollers 2-7 press the tube 12 under the spring force.

And step two, the motor 6-2 is driven to rotate positively, so that the driving shaft 6-3 drives the second bevel gear to rotate through the first double-ratchet wheel linkage assembly 6-4, and further drives the corresponding main supporting wheel to rotate. In the process of rotation of the main supporting wheel, the pipe 12 is driven to move towards the blanking groove body 7. At this point, the crankshaft 6-7 is locked in this direction by the second double ratchet linkage assembly 6-5 and remains stationary. The lower pinch roller 2-7 is driven to rotate in the moving process of the pipe 12; the encoder 2-3 detects the rotating angle of the lower pinch roller 2-7 and sends the rotating angle to the controller. The controller calculates the length of the pipe 12 to be conveyed according to the rotating angle of the lower pressing wheels 2-7 and the diameter of the lower pressing wheels 2-7.

Step three, when the length of the pipe 12 conveyed reaches a preset value; the controller controls the driving motor 6-2 to rotate reversely, so that the driving shaft 6-3 drives the crankshaft 6-7 to rotate through the second double-ratchet wheel linkage assembly 6-5. The second bevel gear is locked in this direction by the first dual ratchet linkage assembly 6-4 and remains stationary.

In the process of rotating the crankshaft 6-7, the clamping cam 6-9 is driven to rotate firstly, so that the clamping mechanism 3 clamps the pipe 12, and meanwhile, the cutting rotating frame 4-1 is driven to overturn downwards, so that the saw blade 4-3 cuts the pipe 12. After the pipe 12 is cut off, the crankshaft 6-7 drives the cutting rotating frame 4-1 to turn upwards and reset, and the clamping cam 6-9 rotates, so that the clamping mechanism 3 clamps the pipe 12. When the photoelectric sensor detects the contact piece again, the driving motor 6-2 starts to rotate forwards again. And entering the step four.

And step four, repeatedly executing the step two and the step three. Continuous severing of the tube 12 is achieved. During the conveying process of the pipe 12, the next section of pipe 12 pushes the cut previous section of pipe 12 to completely enter the blanking groove body 7. The pipe 12 completely entering the blanking groove body 7 rolls or slides to the horizontal bottom surface 7-2 along the guide inclined plane in the blanking groove body 7 for storage.

Claims

1. The utility model provides a coordinated type pipe cutting machine based on positive and negative separation drive which characterized in that: the automatic feeding device comprises a workbench (1), a conveying mechanism (2), a clamping mechanism (3), a cutting mechanism (4), an auxiliary supporting assembly (5), a linkage type driving mechanism (6), a blanking groove body (7) and a controller; the conveying mechanism (2), the clamping mechanism (3) and the cutting mechanism (4) are all arranged on the workbench (1); the output position of the conveying mechanism (2) is aligned with the input position of the clamping mechanism (3); the cutting mechanism (4) is positioned at one side of the clamping mechanism (3); the blanking groove body (7) is arranged at the output end of the workbench (1); one or more auxiliary supporting components (5) are arranged between the blanking groove body (7) and the clamping mechanism (3);

the conveying mechanism (2) is provided with a main supporting roller (2-2) and a lower pressure roller (2-7); the conveyed pipe is pressed between the main supporting roller (2-2) and the lower pressing wheel (2-7); the main supporting roller (2-2) or the lower pressure wheel (2-7) detects the rotating angle through an encoder; the pipe is conveyed by the rotation of the main supporting roller (2-2) or the lower pressure wheel;

the cutting mechanism (4) comprises a cutting rotating frame (4-1), a cutting motor (4-2) and a saw blade (4-3); the bottom of the cutting rotating frame (4-1) and the workbench (1) form a rotating pair; the cutting motor (4-2) is fixed on the cutting rotating frame (4-1); an output shaft of the cutting motor (4-2) is fixed with the saw blade (4-3); the cutting rotating frame (4-1) is driven by a linkage type driving mechanism (6) to turn over up and down in a reciprocating manner;

the clamping mechanism (3) comprises a bottom plate (3-1) and two clamping units; the bottom plate (3-1) is fixed on the workbench (1); the two clamping units are arranged side by side and are arranged on the bottom plate (3-1) at intervals; the two clamping units are respectively positioned at two sides of the saw blade (4-3) in the cutting mechanism (4); the two clamping units have the same structure and respectively comprise a clamping base (3-2), a fixed clamping block (3-3), a sliding clamping block (3-4), a connecting column (3-7), a second spring (3-8), a sliding sleeve (3-9) and a push plate (3-10); the clamping base (3-2) is fixed on the bottom plate (3-1); the fixed clamping block (3-3) is fixed at one end of the clamping base (3-2); the sliding clamping block (3-4) and the clamping base (3-2) form a sliding pair; a connecting column (3-7) is fixed on the side surface of the sliding clamping block (3-4) far away from the fixed clamping block (3-3); the connecting columns (3-7) are connected with sliding sleeves (3-9) in a sliding way; the connecting column (3-7) is sleeved with a second spring (3-8); two ends of the second spring (3-8) respectively abut against the sliding sleeve (3-9) and the sliding clamping block (3-4); a push plate (3-10) is fixed at the outer end of the sliding sleeve (3-9); the push plates (3-10) are pushed by a linkage type driving mechanism (6);

the linkage type driving mechanism (6) comprises a crankshaft (6-7), a cutting transmission connecting rod (6-8) and a clamping cam (6-9); the crankshaft (6-7) is supported on the workbench (1) through a bearing seat; the crank part on the crankshaft (6-7) is aligned with the cutting mechanism (4); one end of the cutting transmission connecting rod (6-8) and a connecting rod journal of a crank part on the crankshaft (6-7) form a rotating pair; the other end of the cutting transmission connecting rod (6-8) and the cutting rotating frame (4-1) form a rotating pair; two clamping cams (6-9) arranged side by side are fixed on the crankshafts (6-7) and are respectively contacted with push plates (3-10) on two clamping units in the clamping mechanism (3);

when the cutting rotating frame (4-1) is at the upper limit position, two clamping units in the clamping mechanism (3) are in a released state; when the cutting rotating frame (4-1) is at the lower limit position, the clamping cam (6-9) pushes the push plate in the clamping unit, so that the clamping unit is in a clamping state.

2. The linkage type pipe cutting machine based on the forward and reverse rotation separation driving as claimed in claim 1, wherein: the linkage type driving mechanism (6) further comprises a driving motor (6-2), a driving shaft (6-3), a first double-ratchet wheel linkage assembly (6-4), a second double-ratchet wheel linkage assembly (6-5) and a conveying transmission assembly (6-6); the first double-ratchet wheel linkage assembly (6-4) and the second double-ratchet wheel linkage assembly (6-5) respectively comprise a first ratchet wheel and pawl mechanism (8), a second ratchet wheel and pawl mechanism (9), a sleeve (10) and a locking support (11); the locking support (11) is fixed on the workbench (1); the locking support (11) is fixed on the workbench (1); the sleeve (10) is supported on the locking support (11); the driving shaft (6-3) is supported in the sleeve (10); the first ratchet-pawl mechanism (8) is arranged between the sleeve (10) and the cylinder at the top of the locking support (11); the second ratchet-pawl mechanism (9) is arranged between the driving shaft (6-3) and the sleeve (10); the direction of the driving shaft (6-3) allowed to rotate relative to the sleeve (10) is opposite to the direction of the sleeve (10) allowed to rotate relative to the locking support (11); the driving shaft (6-3) is driven to rotate by the driving motor (6-2); the direction of the sleeve (10) in the first double-ratchet linkage assembly (6-4) allowed to rotate relative to the locking support (11) is opposite to the direction of the sleeve (10) in the second double-ratchet linkage assembly (6-5) allowed to rotate relative to the locking support (11); the main supporting roller (2-2) and a sleeve (10) in the first double-ratchet wheel linkage assembly (6-4) are driven by the conveying transmission assembly (6-6); a sleeve (10) in the second double-ratchet wheel linkage assembly (6-5) is connected with the crankshaft (6-7).

3. The linkage type pipe cutting machine based on the forward and reverse rotation separation driving as claimed in claim 2, wherein: the first ratchet wheel and pawl mechanism (8) comprises a first ratchet wheel (8-1), a first pawl (8-2) and a torsion spring (8-3); the first ratchet wheel (8-1) is fixed on the outer circumferential surface of the sleeve (10); the ratchet ring of the first ratchet wheel (8-1) is positioned in the outer side of the ratchet ring; one end of one or more first pawls (8-2) is hinged with the inner cavity of the cylinder on the locking support (11), and the other end of the one or more first pawls props against a ratchet ring gear on the outer side of the first ratchet wheel (8-1); torsion springs (8-3) are arranged between the first pawls (8-2) and the locking support (11); the torsion spring (8-3) provides elasticity for the first pawl (8-2) to abut against the ratchet ring outside the first ratchet wheel (8-1);

the second ratchet wheel and pawl mechanism (9) comprises a shaft sleeve (9-1), a second ratchet wheel (9-2), a second pawl (9-3) and a spring (9-4); the shaft sleeve (9-1) is connected with the driving shaft (6-3) through a spline; the second ratchet wheel (9-2) is fixed on the inner side of the sleeve (10); the ratchet ring of the second ratchet wheel (9-2) is positioned in the central hole of the ratchet ring; a plurality of second pawls (9-3) are uniformly distributed along the circumferential direction of the outer side surface of the shaft sleeve (9-1); the inner end of each second pawl (9-3) is hinged with the shaft sleeve (9-1), and the outer end of each second pawl is propped against the ratchet ring at the inner side of the second ratchet wheel (9-2); springs (9-4) are arranged between the second pawls (9-3) and the shaft sleeve (9-1); the spring (9-4) provides the second pawl (9-3) with a spring force against the ratchet ring inside the second ratchet wheel (9-2).

4. The linkage type pipe cutting machine based on the forward and reverse rotation separation driving as claimed in claim 1, wherein: the conveying mechanism (2) comprises a conveying frame (2-1), a main supporting roller (2-2), a pressing component and an encoder (2-3); the conveying frame (2-1) is fixed on the workbench (1); one or more main supporting rollers (2-2) are supported on the conveying frame (2-1); a guide hole for passing through the pipe (12) is formed in a vertical side plate in the conveying frame (2-1); the bottom of the guide hole is aligned with the top of the main support roller (2-2); the pressing assembly comprises a first guide post (2-4), a first spring (2-5), a lower pressing frame (2-6) and a lower pressing wheel (2-7); the first guide post (2-4) which is vertically arranged is fixed with the top of the conveying frame (2-1); the lower pressing frame (2-6) and the first guide post (2-4) form a sliding pair; the first guide posts (2-4) are sleeved with first springs (2-5); two ends of the first spring (2-5) respectively abut against the conveying frame (2-1) and the lower pressing frame (2-6); the lower pinch roller (2-7) is supported at the top of the lower pressing frame (2-6); the lower pinch roller (2-7) is positioned right above one main supporting roller (2-2); a side mounting plate is fixed on the side part of the conveying frame (2-1); the shell of the encoder (2-3) is fixed on the side mounting plate; an input shaft of the encoder (2-3) is fixed with the lower pinch roller (2-7).

5. The linkage type pipe cutting machine based on the forward and reverse rotation separation driving as claimed in claim 1, wherein: the cutting mechanism (4) also comprises a balance weight (4-5); the balance weight (4-5) is fixed on one side of the cutting rotating frame (4-1) far away from the cutting motor (4-2); the balancing weights enable the center of gravity of the whole cutting mechanism (4) to be on the axis of a pin shaft between the cutting rotating frame (4-1) and the workbench (1).

6. The linkage type pipe cutting machine based on the forward and reverse rotation separation driving as claimed in claim 1, wherein: an inclined guide surface (7-1) and a horizontal bottom surface (7-2) are arranged in the inner cavity of the blanking groove body (7); a blanking limiting notch (7-3) is formed in the side plate, close to each auxiliary supporting assembly (5), of the blanking groove body (7); the blanking limiting notch (7-3) is positioned at the top of the inclined guide surface (7-1); the blanking limiting notch (7-3) is aligned with the pipe (12) conveyed by the conveying mechanism (2).

7. The linkage type pipe cutting machine based on the forward and reverse rotation separation driving as claimed in claim 1, wherein: the working profile of the clamping cam (6-9) comprises a large-diameter section, a small-diameter section and two transition sections; two ends of the large-diameter section are smoothly connected with two ends of the small-diameter section through two transition sections respectively; the circumferential angle covered by the large-diameter section is greater than or equal to 180 degrees; when the small diameter sections of the working profiles of the two clamping cams (6-9) are in contact with the corresponding push plates (3-10), the clamping mechanism (3) is in a released state; when the large-diameter sections of the working profiles of the two clamping cams (6-9) are in contact with the corresponding push plates (3-10), the clamping mechanism (3) is in a clamping state; when the cutting rotating frame (4-1) moves downwards until the saw blade (4-3) is contacted with the pipe (12), the large-diameter section of the working profile of the clamping cam (6-9) is moved to a state of resisting against the push plate (3-10); when the cutting rotating frame (4-1) moves upwards until the saw blade (4-3) is separated from the pipe (12), the large-diameter section of the working profile of the clamping cam (6-9) is still in a state of abutting against the push plate (3-10).

8. The linkage type pipe cutting machine based on the forward and reverse rotation separation driving as claimed in claim 1, wherein: a turnover sensor (6-10) is arranged between the crankshaft and the workbench; the turnover sensor (6-10) comprises a contact piece and a photoelectric sensor; one end of the contact piece is fixed with the end part of the crankshaft (6-7); the photoelectric sensor is fixed on one of the bearing seats and corresponds to the position of the contact piece; when the cutting rotating frame (4-1) is at the upper limit position, the contact pieces are aligned with the photoelectric sensor.

9. The linkage type pipe cutting machine based on the forward and reverse rotation separation driving as claimed in claim 1, wherein: the opposite side surfaces of the fixed clamping block (3-3) and the sliding clamping block (3-4) are detachably fixed with clamping claws (3-5); the opposite side surfaces of the clamping claws (3-5) are provided with grooves corresponding to the external dimension of the cut pipe (12).

10. The pipe cutting method of the linkage pipe cutting machine based on the forward and reverse rotation separation driving as claimed in claim 2, wherein: step one, the end part of a pipe (12) is arranged in a conveying mechanism (2) and passes through two clamping units in a clamping mechanism (3); at the moment, the pipe (12) is positioned between the lower pressing wheels (2-7) and the corresponding main supporting roller;

step two, driving the motor (6-2) to rotate positively, so that the driving shaft (6-3) drives the corresponding main supporting wheel to rotate through the first double-ratchet wheel linkage assembly (6-4); in the process of rotating the main supporting wheel, the pipe (12) is driven to move towards the blanking groove body (7); at the moment, the crankshaft (6-7) is locked by the second double-ratchet wheel linkage assembly (6-5) in the steering direction and is kept static; the lower pinch roller (2-7) is driven to rotate in the moving process of the pipe (12); the encoder (2-3) detects the rotating angle of the lower pinch roller (2-7); calculating the length of the pipe (12) to be conveyed according to the rotating angle of the lower pressing wheel (2-7) and the diameter of the lower pressing wheel (2-7);

step three, when the length of the pipe (12) to be conveyed reaches a preset value; the controller controls the driving motor (6-2) to rotate reversely, so that the driving shaft (6-3) drives the crankshaft (6-7) to rotate through the second double-ratchet wheel linkage assembly (6-5); the second bevel gear is locked by the first double-ratchet linkage assembly (6-4) in the steering direction and is kept static;

in the rotating process of the crankshaft (6-7), the clamping cam (6-9) is driven to rotate firstly, so that the clamping mechanism (3) clamps the pipe (12), and meanwhile, the cutting rotating frame (4-1) is driven to overturn downwards so that the saw blade (4-3) cuts the pipe (12); after the pipe (12) is cut off, the crankshaft (6-7) drives the cutting rotating frame (4-1) to turn upwards for resetting, and the clamping cam (6-9) rotates, so that the pipe (12) is clamped by the clamping mechanism (3); after the crankshaft rotates 360 degrees, the driving motor (6-2) starts to rotate forwards again; entering the step four;

step four, repeatedly executing the step two and the step three; continuous cutting of the pipe (12) is realized; in the process of conveying the pipe (12), the pipe (12) at the later section pushes the cut pipe (12) at the previous section to completely enter the blanking groove body (7).