Scaffold vertical rod pipe contracting machine

Abstract

The utility model discloses a scaffold vertical rod pipe shrinking machine which comprises a main body frame, a first frame body and a second frame body are arranged on a platform of the main body frame, and the second frame body is installed on a sliding rail of the main body frame in a sliding mode and fixed through a bolt. The first frame body comprises a bottom plate, a vertical plate and a transverse plate, three lower positioning molds and three groups of guide rails C are arranged on the bottom plate, three pipe shrinking devices are arranged on the vertical plate, the three pipe shrinking devices are respectively mounted on the corresponding guide rails C in a sliding manner, three downward pressing oil cylinders are arranged on the transverse plate, and upper positioning molds are arranged on oil cylinder rods of the three downward pressing oil cylinders; three supporting plates are arranged on the second frame body, and one pipe shrinking device corresponds to one upper positioning mold, one lower positioning mold and one supporting plate to form three groups of stations; the grabbing and conveying device is arranged at the upper ends of the two frame bodies, the unloading slope plate is arranged at the lower ends of the two frame bodies, the feeding device is arranged behind the main body frame, the pipe contracting machine can achieve automatic feeding, pipe contracting and discharging, the production efficiency is improved, and the labor intensity is relieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pipe shrinking machine, especially a scaffold vertical rod pipe shrinking machine. BACKGROUND

[0002] The pipe shrinking machine on the market currently, in the pipe shrinking process, usually all manual feeding and discharging: manual put the workpiece pipe that needs to shrink into the pipe shrinking position of the pipe shrinking machine, and take out after the pipe shrinking is completed, because the human operation is dangerous, and the randomness is big, and the feeding and discharging consume a lot of time, and there are disadvantages such as low production efficiency and high labor intensity. SUMMARY

[0003] The utility model provides a scaffold vertical rod pipe shrinking machine, this pipe shrinking machine can realize automatic feeding, pipe shrinking and discharging, improves production efficiency, and reduces labor intensity. Specific technical scheme is as follows:

[0004] A scaffold vertical rod pipe shrinking machine, including main body frame, its characterized in that: the platform of main body frame is provided with first frame body and second frame body, second frame body is slidably installed on the slide rail of main body frame and is fixed by bolt, first frame body includes bottom plate, stand and horizontal plate, three lower positioning moulds and three groups of guide rails C are arranged on the bottom plate of first frame body, three pipe shrinking devices are arranged on the stand of first frame body, three pipe shrinking devices are installed on corresponding guide rails C respectively and can slide along guide rail C, three down-pressing oil cylinders are arranged on the horizontal plate of first frame body, and upper positioning moulds are arranged on the oil cylinder rods of three down-pressing oil cylinders, three supporting plates are arranged on second frame body, one pipe shrinking device corresponds to one upper positioning mould, one lower positioning mould and one supporting plate, and then three groups of stations are formed, the upper end of first frame body and second frame body is provided with grabbing conveying device, and the lower end of first frame body and second frame body is provided with unloading inclined slope plate.

[0005] The rear of main body frame is provided with feeding device, grabbing conveying device grabs workpiece pipe on feeding device and sequentially conveys to first station, second station and third station, completes three times pipe shrinking operation, and the workpiece pipe that is shrunk falls into material frame through unloading inclined slope plate.

[0006] Further, the pipe shrinking device includes a pipe shrinking cylinder and a mold seat, the pipe shrinking cylinder is fixed on the stand of the first frame body, the oil cylinder rod of the pipe shrinking cylinder passes through the stand of the first frame body and is connected with the mold seat, the mold seat is provided with a mold, the mold has a mold cavity inside, and the diameter of the mold cavity is slightly smaller than the diameter of the workpiece pipe, and the pushing force of the pipe shrinking cylinder is greater than the bearing force of the workpiece pipe itself; the bottom of the mold seat is provided with a sliding block C, the sliding block C is installed on the guide rail C, so that the mold seat can move along the guide rail C, the pipe shrinking cylinder acts, pushes the mold seat to move forward, inserts the workpiece pipe into the mold cavity of the mold, and realizes the pipe shrinking of the workpiece pipe.

[0007] Further, the work station close to the feeding device is the first work station, the work station close to the unloading slope plate is the third work station, and the middle group is the second work station. The mold cavities of the molds in the first work station, the second work station and the third work station are different in diameter. The diameter of the mold cavity of the mold in the third work station is slightly smaller than that of the mold in the second work station, and the diameter of the mold cavity of the mold in the second work station is slightly smaller than that of the mold in the first work station. Thus, the workpiece pipe can realize three times of pipe shrinking operation in the first work station, the second work station and the third work station.

[0008] Further, the upper positioning mold, the lower positioning mold and the supporting plate are all provided with arc grooves. When the workpiece pipe is conveyed to the corresponding work station by the grabbing conveying device, the workpiece pipe is supported by the lower positioning mold and the supporting plate. When the pipe shrinking operation is performed, the lower pressing cylinder is actuated to drive the upper positioning mold to move downward. Through the cooperation of the upper positioning mold and the lower positioning mold, the workpiece pipe is clamped and fixed.

[0009] Further, the second frame body is provided with three baffle seats. The three baffle seats are located at the inner sides of the three supporting plates and are arranged in one-to-one correspondence with the three supporting plates. The baffle seats are all provided with baffle assemblies. The baffle assemblies comprise screws and baffles. The screws pass through the baffle seats and are locked and fixed by lock nuts. The end portions of the screws are provided with baffles. The baffles can further stabilize the workpiece pipe and prevent the workpiece pipe from moving backward during the pipe shrinking.

[0010] Further, the grabbing conveying device comprises a bottom plate. The bottom plate is provided with two transverse guide rails A. One end of the bottom plate is provided with a front pushing cylinder. The cylinder rod of the front pushing cylinder is provided with a sliding plate A. The bottom portion of the sliding plate A is provided with a sliding block A. The sliding block A is installed on the guide rail A so that the sliding plate A can slide along the guide rail A. The sliding plate A is provided with three longitudinal guide rails B. The sliding plate A is provided with a lifting cylinder. The cylinder rod of the lifting cylinder is provided with a sliding plate B. The bottom portion of the sliding plate B is provided with a sliding block B. The sliding block B is installed on the guide rail B so that the sliding plate B can slide along the guide rail B. The top portion of the sliding plate B is provided with four clamping cylinders. The clamping cylinders are provided with sliding tracks. Two sliding seats are slidingly installed on the sliding tracks. The two sliding seats are respectively connected with the driving ends of the clamping cylinders to drive the sliding seats to slide along the sliding tracks. The sliding seats are all provided with clamping jaws. The clamping jaws can realize the grabbing and placing of the workpiece pipe.

[0011] Further, the four clamping cylinders are uniformly distributed along the length direction of the sliding plate B. The two clamping jaws on the sliding seats are symmetrically arranged. In the initial state of the grabbing conveying device, the first group of clamping jaws is located above the feeding device, the second group of clamping jaws is located above the first work station, the third group of clamping jaws is located above the second work station, and the fourth group of clamping jaws is located above the third work station. The front pushing cylinder is actuated to drive the sliding plate A to move forward and backward, thereby driving the four groups of clamping jaws to move. After the workpiece pipe on the feeding device is grabbed to the first work station, the second work station and the third work station to realize three times of pipe shrinking operation, the workpiece pipe falls into the material frame through the unloading slope plate.

[0012] Further, the feeding device comprises a feeding frame and support frames arranged on the top of the feeding frame, the number of the support frames is two, the support frames are symmetrically arranged on the two sides of the feeding frame, and the top of each support frame is provided with a groove; two feeding cylinders are arranged on the feeding frame, an inclined feeding support plate is arranged on the cylinder rod of each feeding cylinder, the feeding cylinder drives the feeding support plate to move upward, thereby holding the workpiece pipe and feeding it into the groove of the support frame, and waiting for the grabbing and conveying device to grab.

[0013] Further, the inner side of each support frame is provided with an inductor, the two inductors are connected with a control box through cables, the outer side of each support frame is provided with an aligning cylinder, an aligning plate is arranged on the cylinder rod of each aligning cylinder, the aligning cylinder drives the aligning plate to move inward, thereby aligning the workpiece pipes; an electromagnetic valve is arranged on the feeding frame, and the feeding cylinders and the aligning cylinders are connected with the gas outlet of the electromagnetic valve through gas pipes.

[0014] Further, the main frame is provided with a control box and an oil distribution device, an oil valve is arranged on the oil distribution device, the oil valve is connected with the control box through a cable, the oil inlet of the oil distribution device is connected with the oil outlet of an oil pump through an oil pipe, and the oil outlets of the oil distribution device are connected with oil cylinders through oil pipes; an oil tank and an oil pump motor are arranged at the bottom of the main frame, the oil pump motor is connected with the control box through a cable, the motor shaft of the oil pump motor is connected with the input shaft of the oil pump, the oil inlet of the oil pump is connected with the oil tank through an oil pipe, the oil pump motor is driven to operate by electricity, thereby pumping the hydraulic oil in the oil tank to the oil distribution device, the oil valve is opened to correspondingly connect the valve port, the hydraulic oil enters the corresponding oil cylinder, and the oil cylinder is driven to work.

[0015] The utility model discloses simple structure, reasonable in design, according to the set program through the feeding device, grabbing and conveying device, pipe shrinking device mutual cooperation, can realize automatic feeding, pipe shrinking and discharging, improve production efficiency, reduce the labor intensity. ACCURATE DRAWINGS

[0016] Figure 1 It is the front view of the utility model;

[0017] Figure 2 It is the right view of the utility model;

[0018] Figure 3 It is the left view of the utility model;

[0019] Figure 4 It is the plan view of the utility model;

[0020] Figure 5 It is the front view of the grabbing and conveying device of the utility model;

[0021] Figure 6is the right view of the grabbing and conveying device of the utility model;

[0022] Figure 7 is the top view of the grabbing and conveying device of the utility model;

[0023] Figure 8 is the front view of the pipe shrinking device of the utility model;

[0024] Figure 9 is the right view of the pipe shrinking device of the utility model;

[0025] Figure 10 is the top view of the pipe shrinking device of the utility model;

[0026] Figure 11 is the front view of the feeding device of the utility model;

[0027] Figure 12 is the right view of the feeding device of the utility model;

[0028] Figure 13 is the top view of the feeding device of the utility model;

[0029] Figure 14 is the structural schematic view of the workpiece pipe of the utility model. DETAILED DESCRIPTION

[0030] In order to better understand the purpose, function and specific design scheme of the utility model, the following further detailed description of the scaffold upright pipe shrinking machine of the utility model is made in combination with the drawings.

[0031] As Figures 1-4 shown, the scaffold upright pipe shrinking machine of the utility model comprises a main body frame 1, the main body frame 1 is provided with a control box 8 and an oil way distributor 5, the oil way distributor 5 is provided with an oil valve 6, the oil valve 6 is connected with the control box 8 through a cable, the oil inlet of the oil way distributor 5 is connected with the oil outlet of an oil pump 3 through an oil pipe, and the oil outlets of the oil way distributor 5 are connected with oil cylinders through oil pipes respectively. The bottom of the main body frame 1 is provided with an oil tank 2 and an oil pump motor 4, the oil pump motor 4 is connected with the control box 8 through a cable, the motor shaft of the oil pump motor 4 is connected with the input shaft of the oil pump 3, the oil inlet of the oil pump 3 is connected with the oil tank 2 through an oil pipe, the oil pump motor 4 is driven to operate the oil pump 3 to pump out the hydraulic oil in the oil tank 2 and supply to the oil way distributor 5, the oil valve 6 is electrified to open the corresponding valve port, so that the hydraulic oil enters the corresponding oil cylinder and drives the oil cylinder to work.

[0032] The platform of the main frame 1 is provided with a first frame body 9 and a second frame body 19, the bottom of the second frame body 19 is provided with a sliding block 20, the sliding block 20 is installed on the slide rail 15 of the main frame 1, so that the second frame body 19 can slide along the slide rail 15, the slide rail 15 is two, and is parallelly arranged on the platform of the main frame 1, in use, the second frame body 19 is moved forward and backward according to the different sizes of the workpiece pipes, after the position of the second frame body 19 is adjusted, the second frame body 19 is fixed with the main frame 1 through bolts. The first frame body 9 comprises a bottom plate, a vertical plate and a horizontal plate, the bottom plate of the first frame body 9 is provided with three lower positioning dies 13 and three groups of guide rails C36, two guide rails C form a group, the vertical plate of the first frame body 9 is provided with three pipe shrinking devices 7, the three pipe shrinking devices 7 are respectively installed on the corresponding guide rails C36 and can slide along the guide rails C36, the horizontal plate of the first frame body 9 is provided with three downward pressing oil cylinders 10, the oil cylinder rods of the three downward pressing oil cylinders 10 are all provided with upper positioning dies 12, the second frame body 19 is provided with three supporting plates 16, one pipe shrinking device 7 corresponds to one upper positioning die 12, one lower positioning die 13 and one supporting plate 16, thereby forming three groups of workstations, the upper ends of the first frame body 9 and the second frame body 19 are provided with a grabbing and conveying device 11, and the lower ends of the first frame body 9 and the second frame body 19 are provided with a discharging inclined plate 14. The rear of the main frame 1 is provided with a feeding device 22, the workstation close to the feeding device 22 is the first workstation, the workstation close to the discharging inclined plate 14 is the third workstation, and the middle group is the second workstation, the grabbing and conveying device 11 grabs the workpiece pipes on the feeding device 22 and sequentially conveys them to the first workstation, the second workstation and the third workstation, so that three pipe shrinking operations are completed, and the shrunk workpiece pipes fall into the material frame through the discharging inclined plate 14.

[0033] Specifically, as shown in the figure, Figures 8-10 The pipe shrinking device 7 comprises a pipe shrinking oil cylinder 38 and a die seat 34, the pipe shrinking oil cylinder 38 is fixed on the vertical plate of the first frame body 9, the oil cylinder rod of the pipe shrinking oil cylinder 38 penetrates through the vertical plate of the first frame body 9 and is connected with the die seat 34, the die seat 34 is provided with a die 35, the die 35 has a die cavity inside, the diameter of the die cavity is slightly smaller than the diameter of the workpiece pipe, and the pushing force of the pipe shrinking oil cylinder 38 is greater than the bearing force of the workpiece pipe itself. The bottom of the die seat 34 is provided with a sliding block C37, the sliding block C37 is installed on the guide rail C36, so that the die seat 34 can move along the guide rail C36, the pipe shrinking oil cylinder 38 acts to push the die seat 34 to move forward, so that the workpiece pipe is inserted into the die cavity of the die 35, and the pipe shrinking of the workpiece pipe is realized.

[0034] The diameters of the die cavities of the dies 35 of the first workstation, the second workstation and the third workstation are different, the diameter of the die cavity of the die of the third workstation is slightly smaller than that of the die of the second workstation, and the diameter of the die cavity of the die of the second workstation is slightly smaller than that of the die of the first workstation, so that the workpiece pipe realizes three pipe shrinking operations on the first workstation, the second workstation and the third workstation.

[0035] As shown in Figures 1-4 , the upper positioning die 12, the lower positioning die 13 and the supporting plate 16 are all provided with circular arc grooves, when the workpiece circular pipe is conveyed to the corresponding work station by the grabbing conveying device 11, it is supported by the lower positioning die 13 and the supporting plate 16, when the pipe shrinking operation is carried out, the lower pressing cylinder 10 is actuated to drive the upper positioning die 12 to move downward, through the cooperation of the upper positioning die 12 and the lower positioning die 13, the clamping and fixing of the workpiece circular pipe is realized.

[0036] The second frame body 19 is provided with three baffle seats 18, the three baffle seats 18 are located at the inner side of the three supporting plates 16 and are arranged in one-to-one correspondence with the three supporting plates 16, the baffle seat 18 is provided with a baffle assembly 17, the baffle assembly 17 includes a screw rod and a baffle, the screw rod passes through the baffle seat 18 and is locked and fixed by a lock nut, the end of the screw rod is provided with a baffle, the baffle can further stabilize the workpiece circular pipe and prevent the workpiece circular pipe from moving backward during the pipe shrinking, at the same time, the baffle assembly 17 can also be finely adjusted.

[0037] The grabbing conveying device 11 arranged at the upper end of the first frame body 9 and the second frame body 19 has the same structure, for the convenience of understanding and description, one of the grabbing conveying devices 11 is taken as an example, as shown in Figures 5-7 , the grabbing conveying device 11 includes a bottom plate 33, the bottom plate 33 is provided with two transverse guide rails A24, one end of the bottom plate 33 is provided with a front pushing cylinder 23, the cylinder rod of the front pushing cylinder 23 is provided with a sliding plate A26, the bottom of the sliding plate A26 is provided with a sliding block A25, the sliding block A25 is installed on the guide rail A24, so that the sliding plate A26 can slide along the guide rail A24. The sliding plate A26 is provided with three longitudinal guide rails B32, the sliding plate A26 is provided with a lifting cylinder 27, the cylinder rod of the lifting cylinder 27 is provided with a sliding plate B28, the bottom of the sliding plate B28 is provided with a sliding block B29, the sliding block B29 is installed on the guide rail B32, so that the sliding plate B28 can slide along the guide rail B32, the top of the sliding plate B28 is provided with four clamping cylinders 30, the clamping cylinder 30 is provided with a sliding rail, two sliding seats are slidably installed on the sliding rail, the two sliding seats are respectively connected with the driving end of the clamping cylinder 30, for driving the sliding seat to slide along the sliding rail, the sliding seat is provided with a clamping jaw, the clamping jaw can realize the grabbing and placing of the workpiece circular pipe.

[0038] The four clamping cylinders 30 are evenly distributed along the length direction of the sliding plate B28, the two clamping jaws (one group) on the sliding seat are symmetrically arranged, the grabbing conveying device 11 is in the initial state (as Figure 2 and Figure 3As shown in the drawings, the first set of clamping jaws is located above the feeding device, the second set of clamping jaws is located above the first work station, the third set of clamping jaws is located above the second work station, and the fourth set of clamping jaws is located above the third work station. The front pushing cylinder 23 drives the sliding plate A 26 to move forward and backward, thereby driving the four sets of clamping jaws 31 to move. After the workpiece pipe on the feeding device 22 is grabbed to the first work station, the second work station and the third work station to realize three times of pipe shrinking operation, it falls into the material frame through the unloading inclined plate 14.

[0039] As shown in the drawings, Figures 11-13 The feeding device 22 includes a feeding frame 44 and a support frame 47 arranged on the top of the feeding frame 44. The number of the support frame 47 is two, which are symmetrically arranged on both sides of the feeding frame 22. The top of the support frame 47 is provided with a groove. Two feeding cylinders 43 are arranged on the feeding frame 44. The cylinder rod of the feeding cylinder 43 is provided with an inclined feeding support plate 42. The feeding cylinder 43 drives the feeding support plate 42 to move upward, holds the workpiece pipe and sends it into the groove of the support frame 47, and waits for the grabbing and conveying device 11 to grab.

[0040] The inner side of the support frame 47 is provided with an inductor 41. The two inductors 41 are connected with the control box 8 through a cable. The outer side of the support frame 47 is provided with a straightening cylinder 39. The cylinder rod of the two straightening cylinders 39 is provided with a straightening plate 40. The straightening cylinder 39 drives the straightening plate 40 to move inward, thereby straightening the workpiece pipe. The feeding frame 44 is provided with an electromagnetic valve 45. The feeding cylinder 43 and the straightening cylinder 39 are connected with the gas outlet of the electromagnetic valve 45 through a gas pipe.

[0041] The working process of the scaffold vertical rod pipe shrinking machine is as follows:

[0042] Each work station is in the initial position (as shown in the drawings), and the workpiece pipe is fully laid on the feeding frame 44. Figure 2 、 Figure 3

[0043] A, start the equipment, the two feeding cylinders 43 on the feeding frame 44 act at the same time, drive the feeding support plate 42 to move upward, make the workpiece pipe fall into the groove of the support frame 47 along the slope of the feeding support plate 42. At this time, the inductor 41 senses the signal, the straightening cylinder 39 acts, drives the straightening plate 40 to move inward, straightens the workpiece pipe, resets the straightening cylinder 39 after straightening, and the feeding cylinder 43 also resets and falls to the initial position. The feeding is completed.

[0044] ​B, the lifting cylinder 27 acts, drives the sliding plate B28 along the guide rail B32 to slide down, falls to the position, the clamp jaw 31 falls on both sides of the workpiece pipe, the clamping cylinder 30 acts, drives two clamping jaws to move inwards and clamps the workpiece pipe, the lifting cylinder 27 resets and rises, the front push cylinder 23 acts, drives the sliding plate A26 to move forward, falls to the position after the lifting cylinder 27 again, falls to the position, the clamping cylinder 30 resets and releases the workpiece pipe, places the workpiece pipe in the first work position on the supporting plate 16 and the arc groove of the lower positioning die 13. The lifting cylinder 27 resets and rises again, the front push cylinder 23 also resets, so that the first group of clamping jaws returns to the top of the feeding device (as shown in Figure 2 、 Figure 3 ), waits for the next time to grab and transfer.

[0045] C, the lower pressing cylinder 10 on the first work position acts, drives the upper positioning die 12 to move downwards, and stops after the arc groove of the upper positioning die 12 presses the workpiece pipe. The pipe shrinking cylinder 38 on the first work position acts, drives the die seat 34 to slide forward along the guide rail C36, so that the workpiece pipe is inserted into the mold cavity of the mold 35. Since the pushing force of the pipe shrinking cylinder 38 is greater than the bearing capacity of the workpiece pipe itself, the workpiece pipe is deformed by being shrunk. After pushing to the position, the pipe shrinking cylinder 38 and the lower pressing cylinder 10 on the first work position reset to the initial position.

[0046] D, repeat the action of A, place the workpiece pipe on the supporting plate 42 to the groove of the supporting frame 47, and arrange the workpiece pipe. Repeat the action of B, grab and transfer the workpiece pipe on the supporting frame 47 to the first work position, and also transfer the workpiece pipe shrunk by the first work position to the second work position. Repeat the action of C, so that the lower pressing cylinder 10 and the pipe shrinking cylinder 38 on the first work position and the second work position act at the same time, and the workpiece pipe on the first work position and the second work position is subjected to the pipe shrinking operation.

[0047] E, repeat the action of A, place the workpiece pipe on the supporting plate 42 to the groove of the supporting frame 47, and arrange the workpiece pipe. Repeat the action of B, grab and transfer the workpiece pipe on the supporting frame 47 to the first work position, and also transfer the workpiece pipe shrunk by the first work position to the second work position, and transfer the workpiece pipe shrunk by the second work position to the third work position. Repeat the action of C, so that the lower pressing cylinder 10 and the pipe shrinking cylinder 38 on the first work position, the second work position and the third work position act at the same time, and the workpiece pipe on the first work position, the second work position and the third work position is subjected to the pipe shrinking operation.

[0048] F, sequentially cycle, the workpiece pipe (as shown in Figure 14 ) shrunk by the third work position is considered to meet the requirements, and the pipe shrunk by the third work position is transferred to the unloading inclined plate 14, so that the workpiece pipe falls into the material frame along the unloading inclined plate 14.

[0049] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or part of the technical features are replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A scaffold pole reducing machine comprising a main frame, characterised in that: The platform of the main frame is provided with a first frame body and a second frame body, the second frame body is slidingly installed on the slide rail of the main frame and is fixed by bolts, the first frame body comprises a bottom plate, a vertical plate and a horizontal plate, three lower positioning molds and three groups of guide rails C are arranged on the bottom plate of the first frame body, three pipe reducing devices are arranged on the vertical plate of the first frame body, the three pipe reducing devices are respectively installed on the corresponding guide rails C and can slide along the guide rails C, three downward pressing oil cylinders are arranged on the horizontal plate of the first frame body, an upper positioning mold is arranged on the oil cylinder rod of each of the three downward pressing oil cylinders, three supporting plates are arranged on the second frame body, one pipe reducing device corresponds to one upper positioning mold, one lower positioning mold and one supporting plate, thereby forming three groups of work stations, the upper ends of the first frame body and the second frame body are provided with a grabbing and conveying device, and the lower ends of the first frame body and the second frame body are provided with a discharging inclined plate; A feeding device is arranged at the rear of the main frame, the grabbing and conveying device grabs the workpiece pipe on the feeding device and sequentially conveys the workpiece pipe to the first work station, the second work station and the third work station to complete three pipe reducing operations, and the reduced workpiece pipe falls into the material frame through the discharging inclined plate.

2. The scaffold pole reduction machine of claim 1, wherein: The pipe reducing device comprises a pipe reducing oil cylinder and a mold base, the pipe reducing oil cylinder is fixed on the vertical plate of the first frame body, the oil cylinder rod of the pipe reducing oil cylinder penetrates through the vertical plate of the first frame body and is connected with the mold base, a mold is arranged on the mold base, the mold has a mold cavity inside, the diameter of the mold cavity is slightly smaller than the diameter of the workpiece pipe, and the pushing force of the pipe reducing oil cylinder is greater than the bearing force of the workpiece pipe itself; a sliding block C is arranged at the bottom of the mold base, the sliding block C is installed on the guide rail C, so that the mold base can move along the guide rail C, the pipe reducing oil cylinder acts to push the mold base to move forward, so that the workpiece pipe is inserted into the mold cavity of the mold, and the pipe reducing of the workpiece pipe is realized.

3. A scaffold pole reducing machine according to claim 1 or 2, characterised in that: The work station close to the feeding device is the first work station, the work station close to the discharging inclined plate is the third work station, and the middle group is the second work station, the diameters of the mold cavities of the molds of the first work station, the second work station and the third work station are different, the diameter of the mold cavity of the mold of the third work station is slightly smaller than that of the mold of the second work station, and the diameter of the mold cavity of the mold of the second work station is slightly smaller than that of the mold of the first work station, so that the workpiece pipe can realize three pipe reducing operations on the first work station, the second work station and the third work station.

4. The scaffold pole reducing machine of claim 3, wherein: Arc grooves are arranged on the upper positioning mold, the lower positioning mold and the supporting plate, when the workpiece pipe is conveyed to the corresponding work station by the grabbing and conveying device, the workpiece pipe is supported by the lower positioning mold and the supporting plate, when the pipe reducing operation is performed, the downward pressing oil cylinder acts to drive the upper positioning mold to move downward, the upper positioning mold and the lower positioning mold are matched to realize the clamping and fixing of the workpiece pipe.

5. A scaffold pole reducing machine according to claim 1 or 4, wherein: Three baffle bases are arranged on the second frame body, the three baffle bases are located on the inner sides of the three supporting plates and are arranged in one-to-one correspondence with the three supporting plates, a baffle assembly is arranged on each of the baffle bases, the baffle assembly comprises a screw rod and a baffle, the screw rod penetrates through the baffle base and is locked and fixed by a lock nut, the end of the screw rod is provided with the baffle, and the baffle can further stabilize the workpiece pipe to prevent the workpiece pipe from moving backward during the pipe reducing.

6. The scaffold pole reduction machine of claim 1, wherein: The grabbing conveying device comprises a bottom plate, two transverse guide rails A are arranged on the bottom plate, a front pushing air cylinder is arranged at one end of the bottom plate, a sliding plate A is arranged on the cylinder rod of the front pushing air cylinder, a sliding block A is arranged at the bottom of the sliding plate A, the sliding block A is installed on the guide rail A, so that the sliding plate A can slide along the guide rail A, three longitudinal guide rails B are arranged on the sliding plate A, a lifting air cylinder is arranged on the sliding plate A, a sliding plate B is arranged on the cylinder rod of the lifting air cylinder, a sliding block B is arranged at the bottom of the sliding plate B, the sliding block B is installed on the guide rail B, so that the sliding plate B can slide along the guide rail B, four clamping air cylinders are arranged at the top of the sliding plate B, a sliding rail is arranged on the clamping air cylinder, two sliding seats are slidably installed on the sliding rail, the two sliding seats are respectively connected with the driving ends of the clamping air cylinders, and the sliding seats are used for driving the sliding seats to slide along the sliding rail, the sliding seats are all provided with clamping jaws, and the clamping jaws can realize grabbing and placing of the workpiece pipe.

7. The scaffold pole reducing machine of claim 6, wherein: The four clamping air cylinders are uniformly distributed along the length direction of the sliding plate B, the two clamping jaws on the sliding seat are symmetrically arranged, in the initial state of the grabbing conveying device, the first group of clamping jaws is located above the feeding device, the second group of clamping jaws is located above the first work station, the third group of clamping jaws is located above the second work station, and the fourth group of clamping jaws is located above the third work station, the front pushing air cylinder drives the sliding plate A to move forward and backward, thereby driving the four groups of clamping jaws to move, the workpiece pipe on the feeding device is grabbed to the first work station, the second work station and the third work station to realize three times of pipe shrinking operation, and then falls into the material frame through the unloading inclined plate.

8. The scaffold pole reducing machine of claim 1 or 7, wherein: The feeding device comprises a feeding frame and a support frame arranged at the top of the feeding frame, the number of the support frames is two, the support frames are symmetrically arranged on the two sides of the feeding frame, and the top of the support frame is provided with a groove; two feeding air cylinders are arranged on the feeding frame, an inclined feeding support plate is arranged on the cylinder rod of the feeding air cylinder, the feeding air cylinder drives the feeding support plate to move upwards, the workpiece pipe is held and sent into the groove of the support frame, and waiting for grabbing by the grabbing conveying device.

9. The scaffold pole reducing machine of claim 8, wherein: The inner sides of the support frames are provided with inductors, the two inductors are connected with a control box through cables, the outer sides of the support frames are provided with alignment air cylinders, the cylinder rods of the two alignment air cylinders are provided with alignment plates, the alignment air cylinders drive the alignment plates to move inward, and then the workpiece pipes are aligned; an electromagnetic air valve is arranged on the feeding frame, and the feeding air cylinders and the alignment air cylinders are connected with the gas outlet of the electromagnetic air valve through air pipes.

10. The scaffold pole reduction machine of claim 1, wherein: A control box and an oil distribution device are arranged on the main frame, an oil valve is arranged on the oil distribution device, the oil valve is connected with the control box through a cable, the oil inlet of the oil distribution device is connected with the oil outlet of an oil pump through an oil pipe, and the oil outlets of the oil distribution device are respectively connected with the oil cylinders through oil pipes; an oil tank and an oil pump motor are arranged at the bottom of the main frame, the oil pump motor is connected with the control box through a cable, the motor shaft of the oil pump motor is connected with the input shaft of the oil pump, the oil inlet of the oil pump is connected with the oil tank through an oil pipe, the oil pump motor is powered to drive the oil pump to operate, the hydraulic oil in the oil tank is pumped out and supplied to the oil distribution device, the oil valve is powered to open the corresponding valve port, the hydraulic oil enters the corresponding oil cylinder, and the oil cylinder is driven to work.

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