Scaffold vertical rod pipe contracting machine

Abstract

The invention 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 invention relates to a tube shrinking machine, in particular to a tube shrinking machine for scaffolding upright poles. Background Art

[0002] The shrinking machines currently on the market usually perform manual loading and unloading during the shrinking process: the round tubes that need to be shrunk are manually placed in the shrinking position of the shrinking machine, and then taken out manually after the shrinking is completed. Since manual operation is dangerous and arbitrary, and loading and unloading takes a lot of time, there are disadvantages such as low production efficiency and high labor intensity. Summary of the invention

[0003] The present invention provides a scaffolding pole shrinking machine, which can realize automatic loading, shrinking and unloading, improve production efficiency and reduce labor intensity. The specific technical scheme is as follows: A scaffolding upright tube shrinking machine comprises a main frame, characterized in that: a first frame and a second frame are arranged on the platform of the main frame, the second frame is slidably mounted on the slide rail of the main frame and fixed by bolts; the first frame 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, three tube shrinking devices are arranged on the vertical plate, the three tube shrinking devices are respectively slidably mounted on the corresponding guide rails C, three downward pressure cylinders are arranged on the horizontal plate, and upper positioning molds are arranged on the cylinder rods of the three downward pressure cylinders; three support plates are arranged on the second frame, one tube shrinking device corresponds to an upper positioning mold, a lower positioning mold and a support plate, thereby forming three groups of workstations; a grabbing and conveying device is arranged at the upper ends of the two frames, and a discharging ramp plate is arranged at the lower ends; a loading device is arranged at the rear of the main frame, the grabbing and conveying device grabs the workpiece round tube on the loading device and conveys it to the first station, the second station and the third station in sequence to complete three tube shrinking operations, and then falls into the material frame through the discharging ramp plate.

[0004] Furthermore, the tube shrinking device includes a tube shrinking cylinder and a mold base. The tube shrinking cylinder is fixed on the vertical plate of the first frame. The cylinder rod of the tube shrinking cylinder passes through the vertical plate of the first frame and is connected to the mold base. A mold is arranged on the mold base. The mold has a mold cavity inside, and the diameter of the mold cavity is slightly smaller than the diameter of the workpiece round tube. The thrust of the tube shrinking cylinder is greater than the bearing capacity of the workpiece round tube itself. A slider C is arranged at the bottom of the mold base. The slider C is installed on the guide rail C so that the mold base can move along the guide rail C. The tube shrinking cylinder is actuated to push the mold base forward, so that the workpiece round tube is inserted into the mold cavity of the mold, thereby realizing the tube shrinkage of the workpiece round tube.

[0005] Furthermore, the workstation close to the loading device is the first workstation, the workstation close to the unloading ramp plate is the third workstation, and the middle group is the second workstation. The mold cavities of the first, second and third workstations have different diameters. The mold cavity diameter of the third workstation is slightly smaller than the mold cavity diameter of the second workstation, and the mold cavity diameter of the second workstation is slightly smaller than the mold cavity diameter of the first workstation, so that the workpiece round tube can achieve three tube shrinking operations at the first, second and third workstations.

[0006] Furthermore, arc grooves are provided on the upper positioning mold, the lower positioning mold and the support plate. When the workpiece round tube is conveyed to the corresponding workstation by the grasping and conveying device, it is supported by the lower positioning mold and the support plate. When the tube shrinking operation is performed, the downward pressure 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 round tube is clamped and fixed.

[0007] Furthermore, three baffle seats are provided on the second frame, and the three baffle seats are located on the inner sides of the three support plates and are arranged one by one corresponding to the three support plates. The baffle seats are each provided with a baffle assembly, and the baffle assembly includes a screw and a baffle. The screw passes through the baffle seat and is locked and fixed by a lock nut. A baffle is provided at the end of the screw, and the baffle can further stabilize the workpiece round tube to prevent the workpiece round tube from moving backward when the tube is shrunk.

[0008] Furthermore, the grasping and conveying device includes a base plate, which is provided with two transverse guide rails A, a forward pushing cylinder is provided at one end of the base plate, a sliding plate A is provided on the cylinder rod of the forward pushing cylinder, a slider A is provided at the bottom of the sliding plate A, and the slider 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 provided on the sliding plate A, a lifting cylinder is provided on the sliding plate A, a sliding plate B is provided on the cylinder rod of the lifting cylinder, a slider B is provided at the bottom of the sliding plate B, and the slider B is installed on the guide rail B so that the sliding plate B can slide along the guide rail B, four clamping cylinders are provided on the top of the sliding plate B, a sliding track is provided on the clamping cylinder, two sliding seats are slidably installed on the sliding track, the two sliding seats are respectively connected to the driving end of the clamping cylinder, and are used to drive the sliding seat to slide along the sliding track, and the sliding seats are provided with clamping claws, and the gripping and placement of the workpiece round tube can be achieved by the clamping claws.

[0009] Furthermore, the four clamping cylinders are evenly distributed along the length direction of the sliding plate B, and the two jaws on the sliding seat are symmetrically arranged. In the initial state of the grabbing and conveying device, the first group of jaws is located above the loading device, the second group of jaws is located above the first station, the third group of jaws is located above the second station, and the fourth group of jaws is located above the third station. The forward push cylinder drives the sliding plate A to move forward and backward, thereby driving the four groups of jaws to move, and the workpiece round tube on the loading device is grabbed to the first station, the second station and the third station to complete three tube shrinking operations, and then falls into the material frame through the unloading ramp plate.

[0010] Furthermore, the feeding device includes a feeding frame and a support frame arranged on the top of the feeding frame. There are two support frames, which are symmetrically arranged on both sides of the feeding frame, and a groove is arranged on the top of the support frame. Two feeding cylinders are arranged on the feeding frame, and the cylinder rods of the feeding cylinders are provided with inclined feeding pallets. The feeding cylinders push the feeding pallets up when they are actuated, lift up the workpiece round tube and send it into the groove of the support frame, waiting to be grabbed by the grabbing and conveying device.

[0011] Furthermore, sensors are provided on the inner side of the support frame, and the two sensors are connected to the control box through cables respectively. Alignment cylinders are provided on the outer side of the support frame, and alignment plates are provided on the cylinder rods of the two alignment cylinders. The movement of the alignment cylinders drives the alignment plates to move inward, thereby aligning the workpiece round tubes; an electromagnetic valve is provided on the feeding frame, and the feeding cylinder and the alignment cylinder are respectively connected to the air outlet of the electromagnetic valve through air pipes.

[0012] Furthermore, a control box and an oil circuit distributor are provided on the main frame, an oil valve is provided on the oil circuit distributor, the oil valve is connected to the control box through cables, the oil inlet of the oil circuit distributor is connected to the oil outlet of the oil pump through an oil pipe, and the oil outlet of the oil circuit distributor is connected to the oil cylinder through oil pipes respectively; an oil tank and an oil pump motor are provided at the bottom of the main frame, the oil pump motor is connected to the control box through cables, the motor shaft of the oil pump motor is connected to the input shaft of the oil pump, and the oil inlet of the oil pump is connected to the oil tank through an oil pipe, the oil pump motor is energized to drive the oil pump to operate, and the hydraulic oil in the oil tank is extracted and supplied to the oil circuit distributor, and the oil valve is energized to open the corresponding valve port, so that the hydraulic oil enters the corresponding oil cylinder to drive the oil cylinder to work.

[0013] The invention has a simple structure and a reasonable design. According to a set program, the feeding device, the grasping and conveying device and the tube shrinking device cooperate with each other to realize automatic feeding, tube shrinking and unloading, thereby improving production efficiency and reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the present invention; Figure 2 It is a right side view of the present invention; Figure 3 It is a left side view of the present invention; Figure 4 is a top view of the present invention; Figure 5 is a front view of the grabbing and conveying device of the present invention; Figure 6 is a right side view of the grabbing and conveying device of the present invention; Figure 7 is a top view of the grabbing and conveying device of the present invention; Figure 8 is a front view of the tube shrinking device of the present invention; Fig. 9 is a right side view of the tube shrinking device of the present invention; Fig.10 is a top view of the tube shrinking device of the present invention; Fig.11 It is a front view of the feeding device of the present invention; Fig.12 It is a right side view of the feeding device of the present invention; Fig.13 is a top view of the feeding device of the present invention; Fig.14 It is a structural schematic diagram of a workpiece circular tube of the present invention. DETAILED DESCRIPTION

[0015] In order to better understand the purpose, function and specific design scheme of the present invention, the scaffolding upright tube shrinking machine of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0016] like Figure 1-Figure 4 As shown, the scaffolding pole shrinking machine of the present invention comprises a main frame 1, a control box 8 and an oil distributor 5 are arranged on the main frame 1, an oil valve 6 is arranged on the oil distributor 5, the oil valve 6 is connected to the control box 8 through a cable, the oil inlet of the oil distributor 5 is connected to the oil outlet of the oil pump 3 through an oil pipe, and the oil outlet of the oil distributor 5 is connected to the oil cylinder through an oil pipe. An oil tank 2 and an oil pump motor 4 are arranged at the bottom of the main frame 1, the oil pump motor 4 is connected to the control box 8 through a cable, the motor shaft of the oil pump motor 4 is connected to the input shaft of the oil pump 3, the oil inlet of the oil pump 3 is connected to the oil tank 2 through an oil pipe, the oil pump motor 4 is powered to drive the oil pump 3 to operate, the hydraulic oil in the oil tank 2 is pumped out and supplied to the oil distributor 5, the oil valve 6 is powered to open the corresponding valve port, so that the hydraulic oil enters the corresponding oil cylinder to drive the oil cylinder to work.

[0017] A first frame 9 and a second frame 19 are arranged on the platform of the main frame 1, and a sliding block 20 is arranged at the bottom of the second frame 19. The sliding block 20 is installed on the slide rail 15 of the main frame 1 so that the second frame 19 can slide along the slide rail 15. There are two slide rails 15, which are arranged in parallel on the platform of the main frame 1. When in use, the second frame 19 is moved back and forth according to the different sizes of the workpiece round tubes. After adjusting the position of the second frame 19, the second frame 19 is fixed to the main frame 1 by bolts. The first frame 9 includes a bottom plate, a vertical plate and a horizontal plate. Three lower positioning molds 13 and three groups of guide rails C36 are arranged on the bottom plate of the first frame 9, and two guide rails C form a group. Three tube shrinking devices 7 are arranged on the vertical plate of the first frame 9, and the three tube shrinking devices 7 are respectively installed on the corresponding guide rails C36 and can slide along the guide rails C36. Three downward pressure cylinders 10 are arranged on the horizontal plate of the first frame 9, and the cylinder rods of the three downward pressure cylinders 10 are all provided with upper positioning molds 12. Three support plates 16 are arranged on the second frame 19, and one tube shrinking device 7 corresponds to an upper positioning mold 12, a lower positioning mold 13 and a support plate 16, thereby forming three groups of workstations. A grabbing and conveying device 11 is arranged at the upper ends of the first frame 9 and the second frame 19, and a unloading ramp plate 14 is arranged at the lower ends of the first frame 9 and the second frame 19. A loading device 22 is arranged at the rear of the main frame 1. The workstation close to the loading device 22 is the first workstation, the workstation close to the unloading ramp plate 14 is the third workstation, and the middle group is the second workstation. The grabbing and conveying device 11 grabs the workpiece round tube on the loading device 22 and conveys it to the first workstation, the second workstation, and the third workstation in sequence, completing three tube shrinking operations. The shrunken workpiece round tube falls into the material frame through the unloading ramp plate 14.

[0018] Specifically, if Figure 8-Figure 10 As shown, the tube shrinking device 7 includes a tube shrinking cylinder 38 and a mold base 34. The tube shrinking cylinder 38 is fixed on the vertical plate of the first frame 9. The cylinder rod of the tube shrinking cylinder 38 passes through the vertical plate of the first frame 9 and is connected to the mold base 34. A mold 35 is arranged on the mold base 34. The mold 35 has a mold cavity inside, and the diameter of the mold cavity is slightly smaller than the diameter of the workpiece round tube. The thrust of the tube shrinking cylinder 38 is greater than the bearing capacity of the workpiece round tube itself. A slider C37 is arranged at the bottom of the mold base 34. The slider C37 is installed on the guide rail C36 so that the mold base 34 can move along the guide rail C36. The tube shrinking cylinder 38 is actuated to push the mold base 34 forward, so that the workpiece round tube is inserted into the mold cavity of the mold 35, and the tube shrinking of the workpiece round tube is realized.

[0019] The mold cavity diameters of the mold 35 at the first station, the second station and the third station are different. The mold cavity diameter of the mold at the third station is slightly smaller than the mold cavity diameter of the mold at the second station, and the mold cavity diameter of the mold at the second station is slightly smaller than the mold cavity diameter of the mold at the first station, so that the workpiece round tube can be reduced three times at the first station, the second station and the third station.

[0020] like Figure 1-Figure 4 As shown, arc grooves are arranged on the upper positioning mold 12, the lower positioning mold 13 and the support plate 16. When the workpiece round tube is conveyed to the corresponding workstation by the grasping and conveying device 11, it is supported by the lower positioning mold 13 and the support plate 16. When the tube shrinking operation is performed, the downward pressure cylinder 10 is actuated to drive the upper positioning mold 12 to move downward. Through the cooperation between the upper positioning mold 12 and the lower positioning mold 13, the workpiece round tube is clamped and fixed.

[0021] Three baffle seats 18 are arranged on the second frame 19, and the three baffle seats 18 are located on the inner sides of the three support plates 16, and are arranged one by one corresponding to the three support plates 16. The baffle seats 18 are each provided with a baffle assembly 17, and the baffle assembly 17 includes a screw and a baffle. The screw passes through the baffle seat 18 and is locked and fixed by a lock nut. A baffle is arranged on the end of the screw. The baffle can further stabilize the workpiece round tube and prevent the workpiece round tube from moving backward when the tube is shrunk. At the same time, the baffle assembly 17 can also be fine-tuned.

[0022] The structures of the grabbing and conveying devices 11 disposed on the upper ends of the first frame 9 and the second frame 19 are the same. For the convenience of understanding and explanation, one of the grabbing and conveying devices 11 is taken as an example. Figure 5-Figure 7 As shown, the grabbing and conveying device 11 includes a base plate 33, on which two transverse guide rails A24 are arranged, a forward push cylinder 23 is arranged at one end of the base plate 33, a sliding plate A26 is arranged on the cylinder rod of the forward push cylinder 23, a slider A25 is arranged at the bottom of the sliding plate A26, and the slider A25 is installed on the guide rail A24 so that the sliding plate A26 can slide along the guide rail A24. Three longitudinal guide rails B32 are arranged on the sliding plate A26, a lifting cylinder 27 is arranged on the sliding plate A26, a sliding plate B28 is arranged on the cylinder rod of the lifting cylinder 27, a slider B29 is arranged at the bottom of the sliding plate B28, the slider B29 is installed on the guide rail B32, so that the sliding plate B28 can slide along the guide rail B32, four clamping cylinders 30 are arranged on the top of the sliding plate B28, a sliding track is arranged on the clamping cylinder 30, two sliding seats are slidably installed on the sliding track, the two sliding seats are respectively connected to the driving ends of the clamping cylinder 30, and are used to drive the sliding seats to slide along the sliding track, and the sliding seats are provided with clamping claws, through which the workpiece round tube can be grasped and placed.

[0023] The four clamping cylinders 30 are evenly distributed along the length direction of the sliding plate B28, and the two clamping claws (two clamping claws form a group) on the sliding seat are symmetrically arranged. The grabbing and conveying device 11 is in the initial state (such as Figure 2 and Figure 3As shown in the figure, the first group of jaws is located above the feeding device, the second group of jaws is located above the first station, the third group of jaws is located above the second station, and the fourth group of jaws is located above the third station. The forward push cylinder 23 drives the sliding plate A26 to move forward and backward, thereby driving the four groups of jaws 31 to move, and the workpiece round tube on the feeding device 22 is grabbed to the first station, the second station and the third station to complete three tube shrinking operations, and then falls into the material frame through the unloading ramp plate 14.

[0024] like Figure 11-13 As shown, the feeding device 22 includes a feeding frame 44 and a support frame 47 arranged on the top of the feeding frame 44. There are two support frames 47, which are symmetrically arranged on both sides of the feeding frame 22. A groove is arranged on the top of the support frame 47. Two feeding cylinders 43 are arranged on the feeding frame 44. The cylinder rods of the feeding cylinders 43 are provided with an inclined feeding plate 42. The feeding cylinders 43 are actuated to push the feeding plate 42 upward, lift up the workpiece round tube and send it into the groove of the support frame 47, waiting to be grabbed by the grabbing and conveying device 11.

[0025] Sensors 41 are provided on the inner side of the support frame 47. The two sensors 41 are connected to the control box 8 through cables. Alignment cylinders 39 are provided on the outer side of the support frame 47. Alignment plates 40 are provided on the cylinder rods of the two alignment cylinders 39. The alignment cylinders 39 drive the alignment plates 40 to move inwards to align the workpiece round tubes. An electromagnetic valve 45 is provided on the feeding frame 44. The feeding cylinder 43 and the alignment cylinder 39 are connected to the air outlet of the electromagnetic valve 45 through air pipes.

[0026] The working process of the scaffolding pole shrinking machine is as follows: Each station is in the initial position (such as Figure 2 , Figure 3 As shown), the loading frame 44 is covered with round workpiece tubes; A. Start the equipment. The two feeding cylinders 43 on the feeding frame 44 are activated at the same time, driving the feeding support plate 42 to move upward, so that the workpiece round tube falls into the groove of the support frame 47 along the slope of the feeding support plate 42. At this time, the sensor 41 senses the signal, and the aligning cylinder 39 is activated, driving the aligning plate 40 to move inward to align the workpiece round tubes. After alignment, the aligning cylinder 39 is reset, and the feeding cylinder 43 is also reset and falls to the initial position, and the loading is completed.

[0027] B. The lifting cylinder 27 is activated, driving the sliding plate B28 to slide downward along the guide rail B32. After falling into place, the clamping claws 31 fall on both sides of the workpiece tube. The clamping cylinder 30 is activated, driving the two clamping claws to move inward to clamp the workpiece tube. The lifting cylinder 27 resets and rises to drive the workpiece tube to rise. After rising into place, the forward cylinder 23 is activated, driving the sliding plate A26 to move forward. After reaching the position, the lifting cylinder 27 falls again and falls into place. The clamping cylinder 30 resets and releases the workpiece tube, placing the workpiece tube in the arc groove of the support plate 16 and the lower positioning mold 13 of the first station. The lifting cylinder 27 resets and rises again, rising into place, and the forward cylinder 23 is also reset, so that the first set of clamping claws returns to the top of the feeding device (such as Figure 2 , Figure 3 as shown), waiting for the next capture and transmission.

[0028] C. The downward pressure cylinder 10 on the first station moves, driving the upper positioning mold 12 to move downward. The arc groove of the upper positioning mold 12 presses the workpiece tube and stops. The shrinking cylinder 38 on the first station moves, pushing the mold seat 34 to slide forward along the guide rail C36, allowing the workpiece tube to be inserted into the mold cavity of the mold 35. Since the thrust of the shrinking cylinder 38 is greater than the bearing capacity of the workpiece tube itself, the workpiece tube is reduced and deformed. After being pushed into place, the shrinking cylinder 38 and the downward pressure cylinder 10 on the first station are reset to their initial positions.

[0029] D. Repeat the action of A, and support the workpiece round tube into the groove of the support frame 47 through the loading support plate 42 to perform the alignment operation. Repeat the action of B, grab the workpiece round tube on the support frame 47 and transfer it to the first station. At the same time, the workpiece round tube that has been shrunk at the first station is also transferred to the second station. Repeat the action of C, so that the downward pressure cylinder 10 and the tube shrinking cylinder 38 on the first station and the second station are actuated at the same time, and the tube shrinking operation is performed on the workpiece round tubes on the first station and the second station.

[0030] E. Repeat the action of A, and support the workpiece round tube into the groove of the support frame 47 through the loading support plate 42 to perform the alignment operation, repeat the action of B, grab the workpiece round tube on the support frame 47 and transfer it to the first station, and also transfer the workpiece round tube that has been shrunk at the first station to the second station, and transfer the workpiece round tube that has been shrunk at the second station to the third station, repeat the action of C, so that the downward pressure cylinder 10 and the tube shrinking cylinder 38 on the first station, the second station and the third station operate at the same time, and perform the tube shrinking operation on the workpiece round tubes on the first station, the second station and the third station.

[0031] F. After successive cycles, the round tube of the workpiece (such as Fig.14 ) is considered to meet the requirements, and the shrunk tube at the third station is transmitted to the unloading ramp plate 14, so that the workpiece round tube falls into the material frame along the unloading ramp plate 14.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A scaffolding pole shrinking machine, comprising a main frame, characterized in that: A first frame and a second frame are arranged on the platform of the main frame, and the second frame is slidably mounted on the slide rail of the main frame and fixed by bolts; the first frame includes a bottom plate, a vertical plate and a horizontal plate, and three lower positioning molds and three groups of guide rails C are arranged on the bottom plate of the first frame, and three tube shrinking devices are arranged on the vertical plate, and the three tube shrinking devices are respectively slidably mounted on the corresponding guide rails C, and three downward pressure cylinders are arranged on the horizontal plate, and upper positioning molds are arranged on the cylinder rods of the three downward pressure cylinders; three support plates are arranged on the second frame, and one tube shrinking device corresponds to an upper positioning mold, a lower positioning mold and a support plate, thereby forming three groups of workstations; a grabbing and conveying device is arranged at the upper ends of the two frames, and a unloading ramp is arranged at the lower ends; a loading device is arranged at the rear of the main frame, and the grabbing and conveying device grabs the workpiece round tube on the loading device and conveys it to the first station, the second station and the third station in sequence to complete three tube shrinking operations, and then falls into the material frame through the unloading ramp.

2. The scaffolding pole shrinking machine according to claim 1, characterized in that: The tube shrinking device includes a tube shrinking cylinder and a mold base. The tube shrinking cylinder is fixed on the vertical plate of the first frame. The cylinder rod of the tube shrinking cylinder passes through the vertical plate of the first frame and is connected to the mold base. A mold is arranged on the mold base. The mold has a mold cavity inside, and the diameter of the mold cavity is slightly smaller than the diameter of the workpiece round tube. The thrust of the tube shrinking cylinder is greater than the bearing capacity of the workpiece round tube itself. A slider C is arranged at the bottom of the mold base. The slider C is installed on the guide rail C so that the mold base can move along the guide rail C. The tube shrinking cylinder is actuated to push the mold base forward so that the workpiece round tube is inserted into the mold cavity of the mold to achieve the tube shrinkage of the workpiece round tube.

3. The scaffolding pole shrinking machine according to claim 1 or 2, characterized in that: The workstation close to the loading device is the first workstation, the workstation close to the unloading ramp is the third workstation, and the middle group is the second workstation. The mold cavities of the molds at the first, second and third workstations have different diameters. The mold cavity diameter of the mold at the third workstation is slightly smaller than the mold cavity diameter of the mold at the second workstation, and the mold cavity diameter of the mold at the second workstation is slightly smaller than the mold cavity diameter of the mold at the first workstation, so that the workpiece round tube can achieve three tube shrinking operations at the first, second and third workstations.

4. The scaffolding pole shrinking machine according to claim 3, characterized in that: Arc grooves are arranged on the upper positioning mold, the lower positioning mold and the pallet. When the workpiece round tube is conveyed to the corresponding workstation by the grabbing and conveying device, it is supported by the lower positioning mold and the pallet. When the tube is shrinking, the downward pressure cylinder is actuated to drive the upper positioning mold to move downward. The workpiece round tube is clamped and fixed by the cooperation of the upper positioning mold and the lower positioning mold.

5. The scaffolding pole shrinking machine according to claim 1 or 4, characterized in that: Three baffle seats are arranged on the second frame, and the three baffle seats are located on the inner sides of the three support plates and are arranged one by one corresponding to the three support plates. The baffle seats are each provided with a baffle assembly, and the baffle assembly includes a screw and a baffle. The screw passes through the baffle seat and is locked and fixed by a lock nut. A baffle is arranged on the end of the screw, and the baffle can further stabilize the workpiece round tube to prevent the workpiece round tube from moving backward when the tube is shrunk.

6. The scaffolding pole shrinking machine according to claim 1, characterized in that: The grabbing and conveying device includes a base plate, on which two horizontal guide rails A are arranged, a forward-pushing cylinder is arranged at one end of the base plate, a sliding plate A is arranged on the cylinder rod of the forward-pushing cylinder, a slider A is arranged at the bottom of the sliding plate A, and the slider 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 cylinder is arranged on the sliding plate A, a sliding plate B is arranged on the cylinder rod of the lifting cylinder, a slider B is arranged at the bottom of the sliding plate B, and the slider B is installed on the guide rail B so that the sliding plate B can slide along the guide rail B, four clamping cylinders are arranged on the top of the sliding plate B, a sliding track is arranged on the clamping cylinder, two sliding seats are slidably installed on the sliding track, the two sliding seats are respectively connected to the driving end of the clamping cylinder, and are used to drive the sliding seat to slide along the sliding track, and the sliding seats are provided with clamping claws, and the clamping claws can be used to realize the grabbing and placement of the workpiece round tube.

7. The scaffolding pole shrinking machine according to claim 6, characterized in that: The four clamping cylinders are evenly distributed along the length direction of the sliding plate B, and the two jaws on the sliding seat are symmetrically arranged. In the initial state of the grabbing and conveying device, the first group of jaws is located above the loading device, the second group of jaws is located above the first station, the third group of jaws is located above the second station, and the fourth group of jaws is located above the third station. The forward push cylinder drives the sliding plate A to move forward and backward, thereby driving the four groups of jaws to move, and the workpiece round tube on the loading device is grabbed to the first station, the second station and the third station to complete three tube shrinking operations, and then falls into the material frame through the unloading ramp plate.

8. The scaffolding pole shrinking machine according to claim 1 or 7, characterized in that: The feeding device includes a feeding frame and a support frame arranged on the top of the feeding frame. There are two support frames, which are symmetrically arranged on both sides of the feeding frame, and a groove is arranged on the top of the support frame. Two feeding cylinders are arranged on the feeding frame, and an inclined feeding pallet is arranged on the cylinder rod of the feeding cylinder. The feeding cylinder pushes the feeding pallet up when it moves, lifts the workpiece round tube and sends it into the groove of the support frame, waiting to be grabbed by the grabbing and conveying device.

9. The scaffolding pole shrinking machine according to claim 8, characterized in that: Sensors are arranged on the inner side of the support frame, and the two sensors are connected to the control box through cables respectively. Alignment cylinders are arranged on the outer side of the support frame, and alignment plates are arranged on the cylinder rods of the two alignment cylinders. The movement of the alignment cylinders drives the alignment plates to move inward, thereby aligning the workpiece round tubes; an electromagnetic valve is arranged on the feeding frame, and the feeding cylinder and the alignment cylinder are connected to the air outlet of the electromagnetic valve through air pipes respectively.

10. The scaffolding pole shrinking machine according to claim 1, characterized in that: A control box and an oil circuit distributor are provided on the main frame. An oil valve is provided on the oil circuit distributor. The oil valve is connected to the control box through cables. The oil inlet of the oil circuit distributor is connected to the oil outlet of the oil pump through an oil pipe. The oil outlet of the oil circuit distributor is connected to the oil cylinder through oil pipes respectively. An oil tank and an oil pump motor are provided at the bottom of the main frame. The oil pump motor is connected to the control box through cables. The motor shaft of the oil pump motor is connected to the input shaft of the oil pump. The oil inlet of the oil pump is connected to the oil tank through an oil pipe. The oil pump motor is energized to drive the oil pump to operate, and the hydraulic oil in the oil tank is drawn out and supplied to the oil circuit distributor. The oil valve is energized to open the corresponding valve port, so that the hydraulic oil enters the corresponding oil cylinder to drive the oil cylinder to work.

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