CN111390539B - Pipe screwing machine and control method thereof - Google Patents
Pipe screwing machine and control method thereof Download PDFInfo
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- CN111390539B CN111390539B CN202010213197.2A CN202010213197A CN111390539B CN 111390539 B CN111390539 B CN 111390539B CN 202010213197 A CN202010213197 A CN 202010213197A CN 111390539 B CN111390539 B CN 111390539B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
Abstract
The invention relates to a pipe twisting machine and a control method thereof, wherein the pipe twisting machine comprises a main clamp, a back clamp, a guide rail and a rack, wherein the guide rail is fixedly arranged on the rack; the back-up tong comprises a hollow first shell and a sliding seat fixedly connected to the bottom end part of the first shell, the sliding seat is connected with the guide rail in a sliding manner, the first shell is also provided with a hydraulic device for driving the first shell to move along the guide rail, and a first clamping mechanism for clamping a coupling is arranged in the first shell; the main tong comprises a hollow second shell, the second shell is fixedly arranged on the guide rail, a second clamping mechanism for clamping a pipe column and a rotating device for driving the second clamping mechanism to rotate are arranged in the second shell, and the rotating device comprises a proportional variable pump for adjusting the rotating speed of the second clamping mechanism; the rotating speed of the main tongs can be well controlled by the proportional variable pump, so that the movement resistance of the second clamping mechanism is reduced, and the obvious crawling phenomenon is avoided when the main tongs rotate.
Description
Technical Field
The invention relates to the technical field of screwing machines, in particular to a pipe screwing machine and a control method thereof.
Background
The pipe screwing machine is used for equipment for screwing a screw and a nut or screwing other components, and has various forms, and the screw-thread fit of large components usually needs special screwing equipment for screwing or unscrewing.
The structure of the existing screwing machine generally comprises a frame, a guide rail arranged on the frame, a main tong and a back-up tong arranged on the guide rail, wherein the back-up tong is movable and is mainly used for clamping a pipe column and then conveying the pipe column to the main tong, and the main tong is responsible for clamping and rotating a coupling to perform tapping or unscrewing work.
The existing screwing machine generally adopts a tooth block with an arc-shaped clamping surface to clamp the pipe column. Current tooth piece all has the chute of seting up on the clamping face, and the purpose of chute mainly is the friction between increase holder and the tubular column, guarantees to press from both sides tightly reliably, but current tooth piece is behind the centre gripping processing, can leave the indentation that has certain degree of depth at the tubular column surface, and this surface that means the tubular column appears damaging, can influence the performance of tubular column.
When an object is clamped by the conventional pipe twisting machine, accurate control is difficult to achieve, and a creeping phenomenon often occurs. In the standby state, the plurality of tooth blocks are arranged in the clamp body in the circumferential direction, the weight of the tooth blocks is generally larger, the reset piece of the tooth blocks must overcome the self weight of the tooth blocks when the tooth blocks are positioned right above the tooth blocks, the reset piece can bear a vertical downward pulling force, so that the load of the reset piece positioned right above the tooth blocks is larger, the tooth blocks positioned right below the tooth blocks can provide a vertical upward supporting force to offset the pulling force caused by the weight, so that the load of the reset piece positioned below the tooth blocks is smaller than that of the reset piece positioned above the tooth blocks, if the tooth blocks work for a long time, the reset piece positioned right above the tooth blocks can generate fatigue too early, so that complete reset can not be carried out, a coupling can not enter the main clamp in the standby state, in addition, because the driving sources for driving the plurality of tooth blocks to clamp are the same, if the pulling force provided by the reset pieces is inconsistent, the traveling distances of the driving sources can be different, so that the eccentric condition can occur, and the product can be damaged.
Disclosure of Invention
The invention aims to provide a pipe twisting machine which is simple to operate, high in recycling efficiency and free of damage to a pipe column, aiming at the defects in the prior art.
The purpose of the invention is realized by the following technical scheme: the application provides a pipe twisting machine, which comprises main tongs, back tongs, a guide rail and a rack, wherein the guide rail is fixedly arranged on the rack; the back-up tong comprises a hollow first shell and a sliding seat fixedly connected to the bottom end part of the first shell, the sliding seat is connected with the guide rail in a sliding manner, the first shell is also provided with a hydraulic device for driving the first shell to move along the guide rail, and a first clamping mechanism for clamping a coupling is arranged in the first shell; the main tong comprises a hollow second shell, the second shell is fixedly mounted on the guide rail, a second clamping mechanism for clamping a pipe column and a rotating device for driving the second clamping mechanism to rotate are arranged in the second shell, and the rotating device comprises a proportional variable pump for adjusting the rotating speed of the second clamping mechanism.
The guide rail is characterized in that sliding plates are respectively arranged on two sides of the sliding seat, the upper end of each sliding plate is fixedly connected with the sliding seat, guide wheels are fixedly mounted at the lower end of each sliding plate through rotating shafts, and a sliding groove for the guide wheels to insert is formed in one outward side of the guide rail.
The first clamping mechanism comprises a first ring gear and a plurality of first tooth blocks, the first ring gear is positioned in the first shell, each first tooth block comprises a first clamping portion used for clamping the pipe column and a first mounting portion opposite to the first clamping portion, and the first mounting portion can move along the radial direction of the first ring gear and is mounted between the two first side plates; the inner ring surface of the first ring gear is provided with pits with the same number as the first tooth blocks, and the first shell is also provided with a first hydraulic oil cylinder for driving the first ring gear to rotate; a plurality of first tension springs are uniformly distributed on the outer side surface of the first side plate, one end of each first tension spring is fixedly connected with one first tooth block, the other end of each first tension spring is fixedly connected with the first side plate, and the first tension springs drive the first mounting parts of the first tooth blocks to abut against the bottom surfaces of the pits in a standby state; the first clamping part of the first tooth block is arc-shaped, and the first clamping surface of the first tooth block is a flat surface.
The first installation part is arranged in a cylindrical shape, a bolt penetrates through the first installation part, and guide grooves for inserting the bolt are formed in the inner side surfaces of the two first side plates; in an assembled state, both end portions of the plug pin are respectively inserted into the guide grooves of the two first side plates.
Wherein, two sides of each first tooth piece all correspond and are provided with two first extension springs of symmetrical arrangement.
The second shell comprises second side plates positioned on two sides of the second shell; the clamping mechanism comprises a ring gear and a plurality of second tooth blocks which are positioned in the second shell, each second tooth block comprises a second clamping part used for clamping the pipe column and a second installation part opposite to the second clamping part, and the second installation part can move along the radial direction of the ring gear and is installed between the two second side plates; the inner ring surface of the ring gear is provided with pits with the same number as the second tooth blocks, and the second shell is also provided with a second hydraulic cylinder for driving the ring gear to rotate; a plurality of second tension springs are uniformly distributed on the outer side surface of the second side plate, one end of each second tension spring is fixedly connected with one second tooth block, the other end of each second tension spring is fixedly connected with the second side plate, and the second tension springs drive the second mounting parts of the second tooth blocks to abut against the bottom surfaces of the pits in a standby state; the second clamping part of the second tooth block is arc-shaped, and the second clamping surface of the second tooth block is a flat surface.
The second mounting part is arranged in a cylindrical shape, a bolt penetrates through the second mounting part, and guide grooves for inserting the bolt are formed in the inner side surfaces of the two second side plates; in an assembled state, both end portions of the latch are inserted into the guide grooves of the two second side plates, respectively.
Wherein, two sides of each second tooth piece all correspond and are provided with the second extension spring that two symmetries were arranged.
Wherein: the counterweight mechanism is used for balancing the second tooth block and comprises a guide block, a counterweight block, a rack, a gear and a bottom plate fixedly arranged on the side plate; the guide blocks are provided with two guide blocks which are respectively and fixedly arranged on two sides of the front surface of the bottom plate, and a plurality of bearings for guiding the movement of the balancing weight are fixedly arranged between each guide block and the bottom plate through rotating shafts; a notch is formed in the middle of the bottom plate, and teeth are formed on two side faces in the notch; two gears are arranged on the bottom surface of the end part of the balancing weight at intervals, the balancing weight is placed between the two guide blocks, and the two gears of the balancing weight are respectively meshed with the teeth on the two sides in the gap; one end of the rack is fixedly connected with the tooth block, and the other end of the rack is inserted between the two gears of the balancing weight and meshed with the two gears.
The application also relates to a control method of the pipe screwing machine, which comprises the following steps;
step a, reducing the rotating speed of a main tong, adjusting the rotating speed of a rotating device in the main tong by adjusting a proportional variable pump, and reducing the rotating speed of the rotating device;
and b, balancing weight, namely, replacing the balancing weights with different weights to balance the second tooth block, so that the second tooth block positioned above is tightly attached to the inside of the clamp body.
The invention has the beneficial effects that: compared with the prior art, its design is simple and easy, and is rationally distributed, through setting up the rotational speed that proportion variable pump can control main pincers better to reduce second fixture's movement resistance, the obvious phenomenon of crawling appears when avoiding main pincers to rotate, improve the job stabilization nature of twisting the machine.
The control method of the pipe screwing machine reduces the load of the tension spring by balancing the tooth blocks through the balancing weights, so that the motion resistance of the tooth blocks is reduced, the braking force required by the tooth blocks to climb out of the pits is reduced, and the main tong does not generate obvious creeping phenomenon when rotating.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
Fig. 1 is a schematic structural view of the screw machine of the present embodiment.
Fig. 2 is a schematic structural view of the back-up tong of the present embodiment.
Fig. 3 is a sectional view of the back-up tong of the present embodiment.
Fig. 4 is a schematic structural diagram of the first tooth block of the present embodiment.
Fig. 5 is an enlarged view of a portion a in fig. 2.
Fig. 6 is a schematic structural view of the main clamp of the present embodiment.
Fig. 7 is a schematic structural view of the main tong with the counterweight mechanism hidden in the embodiment.
Fig. 8 is a sectional view of the main clamp of the present embodiment.
Fig. 9 is a schematic structural view of a second tooth block of the present embodiment.
Fig. 10 is an enlarged view at B in fig. 7.
Fig. 11 is a schematic structural diagram of a counterweight mechanism according to the present application.
Detailed Description
The invention is further described with reference to the following examples.
The concrete implementation mode of the pipe twisting machine disclosed by the invention comprises a main tong 2, a back-up tong 1, a guide rail 3 and a frame, wherein the guide rail 3 is fixedly arranged on the frame; the back-up wrench 1 comprises a hollow first shell 11 and a sliding seat 14 fixedly connected to the bottom end of the first shell 11, the sliding seat 14 is connected with the guide rail 3 in a sliding manner, the first shell 11 is further provided with a hydraulic device (not shown) for driving the first shell to move along the guide rail 3, and a first clamping mechanism for clamping a coupling is arranged inside the first shell 11; the main tong 2 comprises a hollow second shell 21, the second shell 21 is fixedly installed on the guide rail 3, a second clamping mechanism for clamping a pipe column and a rotating device for driving the second clamping mechanism to rotate are arranged in the second shell 21, and the rotating device further comprises a proportional variable pump for adjusting the rotating speed of the second clamping mechanism. Specifically, sliding plates 15 are respectively disposed on two sides of the sliding seat 14, an upper end portion of each sliding plate 15 is fixedly connected to the sliding seat 14, a guide wheel 16 is fixedly mounted at a lower end portion of each sliding plate 15 through a rotating shaft, and a sliding groove 31 for inserting the guide wheel 16 is formed in an outward side of the guide rail 3.
In the present embodiment, referring to fig. 2, the first housing 11 includes first side plates 12 located at both front and rear sides thereof, and referring to fig. 2 to 4, the first clamping mechanism includes a first ring gear 19 and three first tooth blocks 18 located inside the first housing 11, each first tooth block 18 includes a first clamping portion 182 for clamping the pipe string and a first mounting portion 181 opposite to the first clamping portion 182, and the first mounting portion 181 is movable in a radial direction of the first ring gear 19 and mounted between the two first side plates 12. Specifically, the first mounting portion 181 may be configured in a cylindrical manner by forming the first mounting portion 181, a pin is inserted into the first mounting portion 181, guide grooves for inserting the pin are formed in inner side surfaces of the two first side plates 12, and in an assembled state, two end portions of the pin are respectively inserted into the guide grooves of the two first side plates 12. In order to limit the first tooth block 18 to only move linearly, the guide slot is elongated.
Referring to fig. 3, the inner ring surface of the first ring gear 19 is formed with the same number of recesses 20 as the number of the first blocks 18, and in the standby state, the first mounting portions 181 of the first blocks 18 abut against the bottom surfaces of the recesses 20. In order to solve the problem that the conventional clamping assembly damages the outer surface of the pipe column, the first clamping portion 182 of the first tooth block 18 is arc-shaped, the first clamping surface 183 of the first tooth block is a flat surface, the first shell 11 is further provided with a first hydraulic cylinder 13 for driving the first ring gear 19 to rotate, and the output end of the first hydraulic cylinder 13 is fixedly connected with a gear set meshed with the first ring gear 19.
Referring to fig. 2 and 5, in order to enable the first tooth block 18 to return normally, a plurality of first tension springs 17 are uniformly distributed on the outer side surface of the first side plate 12, one end of each first tension spring 17 is fixedly connected with one first tooth block 18, and the other end of each first tension spring 17 is fixedly connected with the first side plate 12.
In this embodiment, please refer to fig. 6, the back-up tong further includes a counterweight mechanism 90 for balancing the second tooth block 28, and the counterweight mechanism 90 balances the second tooth block assembly to reduce the braking force and avoid the occurrence of the creeping phenomenon when the main tong rotates at an ultra-low speed. Initially, the mounting portion 281 of the second block 28 must be located in the recess 20 of the second ring gear and should be closely attached to the bottom surface of the recess 20, so that the space contained in the second block 28 is enough for the coupling to pass through smoothly. In addition, because the dwell pocket 20 has a certain depth, a greater braking force is required to allow the second tooth block assembly to climb out of the pocket 20 to a grip ramp. The pipe twisting machine can be accurately controlled under low torque, the rotating speed is low, the braking force is greatly changed due to different dynamic and static friction, and the main tong can obviously generate a creeping phenomenon when rotating, so that the requirement of accurate control cannot be met. Through the method of carrying out the counter weight to the second dog assembly, the required strength of second extension spring 27 has been reduced to second dog 28 moving resistance has been reduced, and then has been reduced the required braking force of second dog assembly climbing pit 20, and the main tong is no longer obvious when rotatory and is produced the phenomenon of crawling.
In the present embodiment, referring to fig. 7 to 9, the second housing 21 includes second side plates 22 at both front and rear sides thereof. The gripping mechanism includes a ring gear 29 and three second blocks 28 inside the second housing 21, each second block 28 includes a second gripping portion 282 for gripping the pipe string and a second mounting portion 281 opposite to the second gripping portion 282, and the second mounting portion 281 is movable in a radial direction of the ring gear 29 and is mounted between the two second side plates 22. Specifically, the second mounting portion 281 can be moved in a cylindrical manner by arranging the second mounting portion 281, a bolt is inserted into the second mounting portion 281, guide grooves for inserting the bolt are formed in the inner side surfaces of the two second side plates 22, and in an assembled state, two end portions of the bolt are respectively inserted into the guide grooves of the two second side plates 22. In order to limit the second tooth block 28 to only move linearly, the guide slot is elongated.
Referring to fig. 9, the ring gear 29 has recesses 20 formed in an inner circumferential surface thereof in the same number as the number of the second blocks 28, and the second mounting portions 281 of the second blocks 28 abut against bottom surfaces of the recesses 20 in the standby state. In order to solve the problem that the conventional clamping assembly damages the outer surface of the pipe column, the second clamping portion 282 of the second tooth block 28 is arc-shaped, the second clamping surface 283 of the second tooth block is a flat surface, the second housing 21 is further provided with a second hydraulic cylinder 23 for driving the ring gear 29 to rotate, and the output end of the second hydraulic cylinder 23 is fixedly connected with a gear set meshed with the ring gear 29.
Referring to fig. 7 and 10, in order to enable the second tooth block 28 to return normally, a plurality of second tension springs 27 are uniformly distributed on the outer side surface of the second side plate 22, one end of each second tension spring 27 is fixedly connected with one second tooth block 28, and the other end of each second tension spring 27 is fixedly connected with the second side plate 22.
The working process of the pipe screwing machine of the embodiment is as follows: in a standby state, the first tension spring 17 drives the first mounting portion 181 of the first tooth block 18 to abut against the bottom surface of the recess 20, then the feeding side of the back-up wrench 1 extends into the pipe column, then the first hydraulic oil cylinder 13 is started, the first hydraulic oil cylinder 13 drives the first ring gear 19 to rotate, the first ring gear 19 rotates, so that the recess 20 located on the inner annular surface of the first ring gear exerts a thrust force on the first mounting portion 181 of the first tooth block 18, the first mounting portion 181 can move along the radial direction of the first ring gear 19 under the thrust force provided by the first ring gear 19 until the first mounting portion 181 of the first tooth block 18 is completely separated from the recess 20, the first hydraulic oil cylinder 13 then stops, and in the process of converting the standby state into a clamping state, the plurality of first tooth blocks 18 all move inwards and clamp a workpiece. Similarly, in the standby state, the second tension spring 27 drives the second mounting portion 281 of the second tooth block 28 to abut against the bottom surface of the recess 20, then a coupling conveying station located at the side of the main tong conveys a coupling into the main tong, then the second hydraulic cylinder 23 is started, the second hydraulic cylinder 23 drives the ring gear 29 to rotate, the ring gear 29 rotates so that the recess 20 located at the inner annular surface of the ring gear applies a thrust force to the second mounting portion 281 of the second tooth block 28, the second mounting portion 281 moves along the radial direction of the ring gear 29 under the thrust force provided by the ring gear 29 until the second mounting portion 281 of the second tooth block 28 is completely separated from the recess 20, then the second hydraulic cylinder 23 stops, and in the process of converting the standby state into the clamping state, the plurality of second tooth blocks 28 all move inwards and clamp the workpiece. And finally, the hydraulic device drives the movable seat to move so as to convey the pipe column to a screwing station, and the driving device drives the clamping mechanism to rotate so as to cooperate with a main tong of the screwing machine to perform a coupling process. In the process of converting the clamping state into the standby state, the first hydraulic oil cylinder 13 drives the first ring gear 19 to rotate reversely, the first tension spring 17 on the first side plate 12 pulls the first tooth block 18 to return until the first mounting portion 181 of the first tooth block 18 falls into the concave pit 20 again, and the first hydraulic oil cylinder 13 stops working. Similarly, the second hydraulic cylinder 23 drives the ring gear 29 to rotate reversely, the second tension spring 27 on the second side plate 22 pulls the second tooth block 28 to return to the original position until the second mounting portion 281 of the second tooth block 28 falls into the recess 20 again, and the second hydraulic cylinder 23 stops working.
In the pipe screwing machine of the present embodiment, the first clamping surfaces 183 of the first block 18 and the second clamping surfaces 283 of the second block 28 are flat surfaces, so that the outer side surface of the pipe column is not damaged, and the effect of seamless clamping is achieved. The pipe screwing machine of this embodiment design is simple and easy, and is rationally distributed, through setting up the rotational speed that proportion variable pump can control main pincers betterly to reduce second fixture's movement resistance, the obvious phenomenon of crawling appears when avoiding main pincers to rotate, improve the job stabilization nature of pipe screwing machine.
In this embodiment, the pipe twisting machine includes a weight mechanism for balancing the second block. Referring to fig. 11, the weight mechanism includes a guide block 902, a weight 903, a rack 906, a gear 905, and a bottom plate 901 fixedly mounted on the side plates. The guide block 902 is provided with two and fixed mounting respectively in the both sides of bottom plate 901, all has a plurality of bearings that are used for direction balancing weight 903 motion through pivot fixed mounting between each guide block 902 and the bottom plate 901, also can adopt other similar equipment replacement bearings such as gyro wheel, as long as can realize that balancing weight 903 slides can. A gap is formed in the middle of the bottom plate 901, and teeth 904 are formed on two side faces in the gap. Two gears 905 are arranged at the end part of the balancing weight 903 at intervals, the balancing weight 903 is placed between the two guide blocks 902, and the two gears 905 of the balancing weight 903 are respectively meshed with the teeth 904 on the two sides in the gap. One end of the rack 906 is fixedly connected with the tooth block, and the other end of the rack 906 is inserted between and meshed with the two gears 905 of the counterweight block 903.
The control method of the pipe screwing machine in the embodiment comprises the following steps of; step a, reducing the rotating speed of a main tong, adjusting the rotating speed of a rotating device in the main tong by adjusting a proportional variable pump, and reducing the rotating speed of the rotating device; and b, balancing weight, namely, replacing the balancing weights with different weights to balance the second tooth block, so that the second tooth block positioned above is tightly attached to the inside of the clamp body.
Specifically, the counter weight 903 is used for balancing the second tooth block, when the tooth block is located under the position opposite to that shown in fig. 11, the counter weight 903 moves downwards due to gravity, the counter weight 903 moves downwards, the gear 905 is meshed with the rack 906, so that the tooth block is driven to move upwards, the tooth block has the trend of moving upwards, and the tooth block climbs out of the reset arc easily when the tong head rotates due to the fact that the weight of the counter weight 903 is close to the weight of the tooth block. The tension spring 27 has an auxiliary effect and can reset the tooth blocks only by providing small tension, and when the tong head rotates, the tooth blocks climb out of a reset arc under the action of braking force, so that the braking force is also reduced to be small, and the torque control precision is improved. Similarly, when the dental block is located right above the position shown in fig. 11, the weight block 903 tends to move downward due to gravity, the weight block 903 moves downward, the gear 905 is engaged with the rack 906, and the dental block is driven to move upward, so that the dental block tends to move upward.
According to the control method of the pipe twisting machine, the ultra-low-speed rotation of the main tong is realized through the proportional variable pump, the higher the rotating speed, the larger the inertia is, the difficulty in accurate control of torque is caused, the ultra-low-speed rotation of the main tong is realized through the proportional variable pump, the rotation inertia of the tong head is reduced, and therefore the control accuracy of the pipe twisting machine is improved. In addition, the tooth block assembly is weighted, so that the braking force is reduced, and the phenomenon of creeping when the main tong rotates at an ultra-low speed is avoided. In the initial state, the installation part of the tooth block must be positioned in the concave pit of the ring gear and tightly attached to the bottom surface of the concave pit, so that the space contained by the tooth block is enough to allow the coupling to pass through smoothly. In addition, because the stopping pits have certain depth, the tooth block assembly can climb out of the pits only by large braking force, and the purpose of clamping the slope surface is achieved. The pipe twisting machine can be accurately controlled under low torque, the rotating speed is low, the braking force is greatly changed due to different dynamic and static friction, and the phenomenon of creeping obviously occurs when the tong head rotates, so that the requirement of accurate control cannot be met. To solve the problem, the embodiment reduces the force required by the tension spring by a method of balancing the tooth block assembly, thereby reducing the motion resistance of the tooth block, further reducing the braking force required by the tooth block assembly to climb out of the pit, and avoiding the phenomenon of obvious crawling when the main tong rotates.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A pipe twisting machine is characterized in that: the back-up tong comprises main tongs, back-up tongs, a guide rail and a rack, wherein the guide rail is fixedly arranged on the rack;
the back-up tong comprises a hollow first shell and a sliding seat fixedly connected to the bottom end of the first shell, the sliding seat is connected with a guide rail in a sliding manner, the first shell is further provided with a hydraulic device for driving the first shell to move along the guide rail, and a first clamping mechanism for clamping a coupling is arranged in the first shell;
the main clamp comprises a hollow second shell, and the second shell comprises second side plates positioned on two sides of the second shell; the second shell is fixedly arranged on the guide rail, a second clamping mechanism for clamping a pipe column and a rotating device for driving the second clamping mechanism to rotate are arranged in the second shell, the rotating device comprises a proportional variable pump for adjusting the rotating speed of the second clamping mechanism, and the second clamping mechanism comprises a plurality of second tooth blocks positioned in the second shell;
the pipe twisting machine further comprises a counterweight mechanism for balancing the second tooth block, wherein the counterweight mechanism comprises a guide block, a counterweight block, a rack, a gear and a bottom plate fixedly mounted on the second side plate; the guide blocks are provided with two guide blocks which are respectively and fixedly arranged on two sides of the front surface of the bottom plate, and a plurality of bearings for guiding the movement of the balancing weight are fixedly arranged between each guide block and the bottom plate through rotating shafts; a notch is formed in the middle of the bottom plate, and teeth are formed on two side faces in the notch; two gears are arranged on the bottom surface of the end part of the balancing weight at intervals, the balancing weight is placed between the two guide blocks, and the two gears of the balancing weight are respectively meshed with the teeth on the two sides in the gap; one end of the rack is fixedly connected with the second tooth block, and the other end of the rack is inserted between the two gears of the balancing weight and meshed with the two gears.
2. The pipe threading machine of claim 1, wherein: the two sides of the sliding seat are respectively provided with a sliding plate, the upper end part of the sliding plate is fixedly connected with the sliding seat, the lower end part of the sliding plate is fixedly provided with a guide wheel through a rotating shaft, and one outward side of the guide rail is provided with a sliding groove for the guide wheel to insert.
3. A pipe threading machine according to claim 1 or 2, characterized in that: the first clamping mechanism comprises a first ring gear and a plurality of first tooth blocks, the first ring gear is positioned in the first shell, each first tooth block comprises a first clamping portion used for clamping a pipe column and a first mounting portion opposite to the first clamping portion, and the first mounting portion can move along the radial direction of the first ring gear and is mounted between two first side plates; the inner ring surface of the first ring gear is provided with pits with the same number as the first tooth blocks, and the first shell is also provided with a first hydraulic oil cylinder for driving the first ring gear to rotate; a plurality of first tension springs are uniformly distributed on the outer side surface of the first side plate, one end of each first tension spring is fixedly connected with one first tooth block, the other end of each first tension spring is fixedly connected with the first side plate, and the first tension springs drive the first mounting parts of the first tooth blocks to abut against the bottom surfaces of the pits in a standby state; the first clamping part of the first tooth block is arc-shaped, and the first clamping surface of the first tooth block is a flat surface.
4. A pipe threading machine according to claim 3, characterized in that: the first mounting part is arranged in a cylindrical shape, a bolt penetrates through the first mounting part, and guide grooves for the bolt to insert are formed in the inner side surfaces of the two first side plates; in an assembled state, both end portions of the plug pin are respectively inserted into the guide grooves of the two first side plates.
5. A pipe threading machine according to claim 3, characterized in that: two sides of each first tooth piece all correspond and are provided with two first extension springs of symmetrical arrangement.
6. A pipe threading machine according to claim 1 or 2 or 4 or 5, characterized in that: the second clamping mechanism comprises a ring gear positioned in the second shell, each second tooth block comprises a second clamping part used for clamping the pipe column and a second installation part opposite to the second clamping part, and the second installation part can move along the radial direction of the ring gear and is installed between the two second side plates; the inner ring surface of the ring gear is provided with pits with the same number as the second tooth blocks, and the second shell is also provided with a second hydraulic cylinder for driving the ring gear to rotate; a plurality of second tension springs are uniformly distributed on the outer side surface of the second side plate, one end of each second tension spring is fixedly connected with one second tooth block, the other end of each second tension spring is fixedly connected with the second side plate, and the second tension springs drive the second mounting parts of the second tooth blocks to abut against the bottom surfaces of the pits in a standby state; the second clamping part of the second tooth block is arc-shaped, and the second clamping surface of the second tooth block is a flat surface.
7. The pipe threading machine of claim 6, wherein: the second mounting part is arranged in a cylindrical shape, a bolt penetrates through the second mounting part, and guide grooves for the bolt to insert are formed in the inner side surfaces of the two second side plates; in an assembled state, both end portions of the latch are inserted into the guide grooves of the two second side plates, respectively.
8. The pipe threading machine of claim 6, wherein: two sides of each second tooth block are correspondingly provided with two second tension springs which are symmetrically arranged.
9. A control method of a pipe screwing machine according to any one of claims 1 to 8, characterized in that: comprises the following steps;
step a, reducing the rotating speed of a main tong, adjusting the rotating speed of a rotating device in the main tong by adjusting a proportional variable pump, and reducing the rotating speed of the rotating device;
and b, balancing weight, namely, replacing the balancing weights with different weights to balance the second tooth block, so that the second tooth block positioned above is tightly attached to the inside of the clamp body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010019372 | 2020-01-08 | ||
| CN2020100193724 | 2020-01-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111390539A CN111390539A (en) | 2020-07-10 |
| CN111390539B true CN111390539B (en) | 2021-05-25 |
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| CN202010213197.2A Active CN111390539B (en) | 2020-01-08 | 2020-03-24 | Pipe screwing machine and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112388287B (en) * | 2020-11-16 | 2021-11-05 | 泰州市津达电子科技有限公司 | Water pipe metal casing mounting plate |
| CN112453599A (en) * | 2020-12-01 | 2021-03-09 | 冯民荣 | Robot for releasing sliding sleeve screw |
| CN114382291B (en) * | 2022-02-23 | 2024-03-19 | 广东尚博特新材料科技有限公司 | Sectional unscrewing device for concrete pouring conduit |
| CN116352655B (en) * | 2023-06-02 | 2023-10-13 | 鄄城鑫磊交通工程材料有限公司 | Grouting pipe quick connection equipment and method |
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