A bending machine that adjusts bending radius according to thickness

Abstract

The present invention relates to a bending machine capable of adjusting the bending radius according to the thickness, comprising a chassis, a placing device, a thickness detecting device and a bending device, wherein the bending device comprises a driving hydraulic cylinder, a punch device, a radius adjusting device and an angle adjusting device, wherein the radius adjusting device is used to limit the bending radius size when the metal sheet is bent, and the angle adjusting device is used to limit the bending angle size when the metal sheet is bent, and the punch device comprises a fixed plate, a driving shaft and a driven shaft, wherein the driving shaft is connected to the driven shaft through a two-way overrunning clutch, the radius adjusting device is connected to the driven shaft by transmission, and the angle adjusting device is connected to the driving shaft by transmission, and the radius adjusting device can be relatively unfolded and folded with the rotation of the driven shaft, and the thickness detecting device drives the driven shaft to rotate according to the thickness of the metal sheet to adjust the radius adjusting device. The bending machine of the present invention realizes that the bending radius is adjusted according to the thickness of the metal sheet and the bending angle size, thereby reducing the cost of the bending machine and improving the utilization rate.

Description

Technical Field

[0001] The invention relates to the field of bending machines, and in particular to a bending device with adjustable bending radius of the bending machine. Background Art

[0002] In the field of hardware processing, using a bending machine to bend metal sheets is a common process. When a metal sheet is bent, a bend fillet that is approximately an arc will be formed at the bend, and the radius of the bend fillet is also the bending radius. Usually, the bending radius of the metal sheet is different according to different usage requirements; at the same time, the bending radius of the metal sheet also needs to change with different metal materials, different sheet thicknesses, and different bending angles. Since an inappropriate bending radius will greatly reduce the service life of the metal sheet's bending corner, different sheet thicknesses and different bending angles correspond to different bending radii during the metal sheet bending process.

[0003] The traditional method can only achieve different bending radii by processing different special punches to correspond to different bending radii. For a bending machine, various types of punches are usually required in the project to meet the processing of metal sheets with different bending radii. When the bending radius needs to be changed during the bending process of the metal sheet, different types of punches need to be replaced. This bending machine equipped with multiple punches is not only costly, but also has low utilization rate of a single punch. Summary of the invention

[0004] The present invention provides a bending machine capable of adjusting the bending radius according to the thickness, so as to solve the technical problems in the prior art that the bending machine needs to be equipped with multiple punches, resulting in high cost and low utilization rate of a single punch.

[0005] A bending machine for adjusting the bending radius according to the thickness of the present invention adopts the following technical solution:

[0006] A bending machine for adjusting the bending radius according to the thickness, comprising a base frame, a placing device, a thickness detection device and a bending device, wherein the placing device is used to place the metal sheet to be bent, and the bending device is used to bend the metal sheet on the placing device, and the bending device comprises a driving hydraulic cylinder, a punch device, a radius adjustment device and an angle adjustment device, wherein the radius adjustment device is used to limit the bending radius size of the metal sheet when bending, and the angle adjustment device is used to limit the bending angle size of the metal sheet when bending, and the punch device is installed at the end of the hydraulic rod of the driving hydraulic cylinder, and the punch device comprises a fixed plate, a main The driving shaft and the driven shaft, the radius adjustment device and the angle adjustment device are all movably mounted on the fixed plate. The driving shaft is connected to the driven shaft through a two-way overrunning clutch. The radius adjustment device is transmission-connected to the driven shaft. The angle adjustment device is transmission-connected to the driving shaft. The radius adjustment device includes a first telescopic arc, a second telescopic arc and a third telescopic arc that can be relatively unfolded and folded as the driven shaft rotates. The thickness detection device drives the driven shaft to rotate according to the thickness of the metal sheet to adjust the radius adjustment device. When the driving shaft rotates, it drives the angle adjustment device to move and drives the driven shaft to rotate through the two-way overrunning clutch at the same time.

[0007] Furthermore, the placement device includes a first hydraulic cylinder, a telescopic plate, and a placement plate; the thickness detection device includes the first hydraulic cylinder, a telescopic hydraulic cylinder, and a spiral shaft; the inner cavity of the telescopic hydraulic cylinder is connected to the inner cavity of the first hydraulic cylinder through a hose; the telescopic hydraulic cylinder extends as the telescopic plate extends; the spiral shaft is rotatably arranged; the telescopic end of the telescopic hydraulic cylinder is connected to the spiral shaft; and the telescopic hydraulic cylinder drives the spiral shaft to rotate and drives the driven shaft to rotate when it is extended or retracted.

[0008] Furthermore, the fixed plate, driving shaft, driven shaft and two-way overrunning clutch are each arranged with two intervals in the upper and lower parts. One end of the spiral shaft is connected to a first gear, which is located between the upper and lower driven shafts and cooperates with the end face teeth on the two driven shafts at the same time. The radius adjustment device is arranged between the two fixed plates, and the second telescopic arc and the third telescopic arc are respectively provided with a second gear shaft and a third gear shaft connected to the two driven shafts. The angle adjustment device has two upper and lower parts, and the two angle adjustment devices are respectively arranged on the upper and lower sides of the two fixed plates.

[0009] Furthermore, the two driving shafts are respectively connected to driving motors.

[0010] Further, the first telescopic arc is a box structure with openings on both sides, the second telescopic arc and the third telescopic arc are arranged at intervals up and down and are both located inside the first telescopic arc, first sliders are fixed on the upper and lower sides of the first telescopic arc, and slideways cooperating with the first slider are respectively provided on the opposite sides of the upper and lower fixed plates, first arc-shaped slideways are respectively provided on the upper and lower sides of the first telescopic arc, a second slider cooperating with the upper first arc-shaped slideway is provided on the upper side of the second telescopic arc, and a third slider cooperating with the lower first arc-shaped slideway is provided on the lower side of the third telescopic arc, and the second telescopic arc and the third telescopic arc are respectively driven by the second slider and the third slider to move the first telescopic arc along the slideway.

[0011] Furthermore, the angle adjustment device is a telescopic rod structure, including a first telescopic rod and a second telescopic rod that are movably mounted together, the first telescopic rod and the second telescopic rod form an L-shaped structure, the second telescopic rod includes a baffle rod that contacts the metal plate when bent, and the second telescopic rod is linked to the radius adjustment device to drive the second telescopic rod to extend and retract relative to the first telescopic rod when the radius adjustment device is unfolded and folded.

[0012] Furthermore, a second arc slide corresponding to and identical to the first arc slide on the upper side is provided on the upper side of the second telescopic arc, and a third arc slide corresponding to and identical to the first arc slide on the lower side is provided on the lower side of the third telescopic arc. The two second telescopic rods are respectively provided with fourth sliders that cooperate with the second arc slide and the third arc slide to realize the linkage between the second telescopic rod and the radius adjustment device.

[0013] Furthermore, two driving hydraulic cylinders are arranged at intervals on the left and right, the fixed end of the telescopic hydraulic cylinder is fixed between the two driving hydraulic cylinders, the telescopic end of the telescopic hydraulic cylinder includes a portal frame, the screw shaft is installed above the base frame through a support frame, and a spiral hole is opened on the portal frame to cooperate with the spiral transmission of the screw shaft.

[0014] Furthermore, the placing device includes two parts arranged side by side and spaced apart, the two parts of the placing device have the same structure and are symmetrically arranged, the placing device includes a first hydraulic cylinder, a telescopic plate, a placing plate and a moving rod, and a slide rail that slides with the moving rod is provided on the base frame. When the bending device bends the metal sheet, the two parts of the placing device move away from each other to allow the metal sheet to bend and deform.

[0015] The beneficial effects of the present invention are as follows: the present invention designs a new bending device, which includes a radius adjustment device and an angle adjustment device, and sets a thickness detection device between the placement device and the bending device, and uses the thickness detection device to drive the radius adjustment device to operate according to the thickness of the metal sheet, thereby changing the bending radius of the metal sheet limited by the radius adjustment device when it is bent. At the same time, the angle adjustment device is linked with the radius adjustment device through the active shaft, and when the bending angle limited by the angle adjustment device is changed by the active shaft, the active shaft can simultaneously drive the radius adjustment device to operate, thereby, on the basis of realizing the adjustment of the bending radius according to the thickness of the metal sheet, the bending radius can also be adjusted according to the bending angle, and under the action of the two-way overrunning clutch, when the bending radius is adjusted according to the thickness, the angle adjustment device will not be driven to operate. The bending machine of the present invention realizes the adjustment of the bending radius according to the thickness and the bending angle of the metal sheet. Compared with the prior art, the bending machine of the present invention does not need to be equipped with multiple punches, which not only reduces the cost, but also the bending machine of the present invention can realize stepless adjustment, and has a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a bending machine for adjusting the bending radius according to the thickness of the present invention;

[0018] Figure 2 It is a structural schematic diagram of an embodiment of a bending machine for adjusting the bending radius according to the thickness of the present invention (excluding the punch device);

[0019] Figure 3 for Figure 1 A schematic diagram of the structure of the middle punch device;

[0020] Figure 4 for Figure 3 Schematic diagram of the structure of the middle punch device after removing the upper fixed plate;

[0021] Figure 5 for Figure 3 Schematic diagram of the structure of the middle punch device after removing the upper fixed plate, driven shaft, driving shaft and two-way overrunning clutch;

[0022] Figure 6 It is a schematic diagram of the coordination between the radius adjustment device and the angle adjustment device;

[0023] Figure 7 It is a schematic diagram of the coordination between the radius adjustment device and the angle adjustment device;

[0024] Figure 8 This is a schematic diagram of the structure of the radius adjustment device after it is unfolded to a certain angle;

[0025] Fig. 9 This is a schematic diagram of the structure of the radius adjustment device after it is unfolded to a certain angle;

[0026] Fig.10 for Figure 3 Schematic diagram of the structure of the middle punch device after removing the internal driving shaft, driven shaft, radius adjustment device and angle adjustment device;

[0027] Fig.11 for Fig.10 The schematic diagram of the structure after removing the upper fixed plate;

[0028] Fig.12 is a structural schematic diagram of an angle adjustment device;

[0029] In the figure: 100, chassis; 110, placement device; 111, first hydraulic cylinder; 112, telescopic plate; 113, placement plate; 114, moving rod; 120, driving hydraulic cylinder; 130, thickness detection device; 131, hose; 132, telescopic hydraulic cylinder; 133, screw shaft; 134, door frame; 135, first gear; 200, bending device; 210, fixed plate; 211, driven shaft mounting hole; 212, rotating hole; 213, hydraulic rod; 214, slideway; 215, arc gear slideway; 220, radius adjustment device; 22 1. Second gear shaft; 222. First slider; 223. First telescopic arc; 224. Second slider; 225. Third gear shaft; 226. Second telescopic arc; 227. Third telescopic arc; 228. Second arc slide; 229. First arc slide; 230. Angle adjustment device; 231. Stop rod; 232. Fourth slider; 233. First telescopic rod; 234. Second telescopic rod; 235. Rotating shaft; 236. Fourth gear; 240. Two-way overrunning clutch; 241. Driving shaft; 242. Driven shaft; 243. Face gear. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] An embodiment of a bending machine for adjusting the bending radius according to the thickness of the present invention is as follows: Figures 1 to 12 As shown, the bending machine includes a base frame 100, a placing device 110, a thickness detection device 130 and a bending device 200. The placing device 110 is used to place the metal sheet to be bent, and the bending device 200 is used to bend the metal sheet on the placing device 110. The bending device 200 includes a punch device, a radius adjustment device 220 and an angle adjustment device 230. The radius adjustment device 220 is used to limit the bending radius size when the metal sheet is bent, and the angle adjustment device 230 is used to limit the bending angle size when the metal sheet is bent. The thickness detection device 130 is used to measure the thickness of the metal sheet and adjust the bending radius size limited by the radius adjustment device 220 according to the thickness of the metal sheet. The base frame 100 is a platform structure including an upper plate surface and legs supporting the upper plate surface. The placing device 110 and the bending device 200 are arranged on the base frame 100 relatively along the front-to-back direction.

[0032] For the convenience of description, the bending device 200 is defined as being located in front of the placing device 110. The placing device 110 has two parts arranged side by side and spaced apart in the left-right direction. The two parts of the placing device 110 respectively include a first hydraulic cylinder 111, a telescopic plate 112, a placing plate 113 and a moving rod 114; the placing plate 113 is fixedly arranged with the outer shell of the first hydraulic cylinder 111, and the telescopic plate 112 is a rectangular frame structure. The telescopic plate 112 passes through the placing plate 113 and is fixed with the telescopic arm of the first hydraulic cylinder 111. The telescopic arm of the first hydraulic cylinder 111 telescopes forward and backward, thereby driving the telescopic plate 112 to telescope in the forward and backward direction. When the metal sheet needs to be bent, the metal sheet passes through the two telescopic plates 112 at the same time and is placed on the two placing plates 113. The length of the telescopic plate 112 extending out of the placing plate is adjusted so that a side of the telescopic plate away from the first hydraulic cylinder 111 just contacts the metal sheet. The telescopic plate 112 is equivalent to a measuring ruler for measuring the thickness of the metal sheet. When in use, the extended length of the telescopic plate is adapted to the thickness of the metal sheet.

[0033] The base frame 100 is also provided with a slide rail that is slidably matched with the moving rod 114, and the moving rod 114 can slide in the slide rail in the left and right direction; the placement plate 113 is fixedly connected to the moving rod, and the placement plate 113 and the first hydraulic cylinder 111 can move synchronously with the left and right movement of the moving rod 114, thereby making the two parts of the placement device 110 move away from or approach each other. When the bending device moves toward the metal sheet on the placement plate 113 and punches the metal sheet, the punching force of the bending device will drive the two parts of the placement device 110 to move away from each other, so that there can be enough space between the two parts of the placement device for the metal sheet to bend and deform.

[0034] The bending device includes a punch device, a radius adjustment device 220 and an angle adjustment device 230. Two driving hydraulic cylinders 120 are fixed side by side and spaced apart in the left-right direction on the base frame 100. The punch device is installed on the hydraulic rods 213 of the two driving hydraulic cylinders 120. The hydraulic rods 213 can telescope in the front-to-back direction, thereby driving the punch device to move forward and backward, so as to bend the metal sheet placed on the device.

[0035] The punch device includes two fixed disks 210 arranged at intervals in the upper and lower parts, and the hydraulic rods 213 of the two driving hydraulic cylinders 120 extend respectively between the two fixed disks 210 and are fixedly connected to the two fixed disks 210. The two fixed disks 210 have the same structure and are arranged symmetrically in the upper and lower parts. Two independently working driving shafts 241, two driven shafts 242 and two bidirectional overrunning clutches 240 are respectively installed between the two fixed disks 210. The two driving shafts 241 are respectively connected to two independent driving motors (not shown in the figure), and the driving motors drive the two driving shafts 241 to rotate in opposite directions. The bidirectional overrunning clutches 240 are respectively installed between the corresponding driving shafts 241 and the driven shafts 242, which can realize that the driven shaft rotates with the rotation of the driving shaft, while the driving shaft does not rotate with the rotation of the driven shaft. The bidirectional overrunning clutch is an existing mature technology and will not be described here.

[0036] In this embodiment, the two driving shafts 241 and the driven shaft 242 are arranged symmetrically up and down, and the structures of the two driving shafts 241 are the same, and the structures of the two driven shafts 242 are also the same. The two driven shafts 242 are rotatably mounted on the two fixed disks 210 respectively. Specifically, the fixed disk 210 is provided with a driven shaft mounting hole 211, and the driven shaft mounting hole 211 is a stepped hole, and the driven shaft 242 is rotatably mounted in the driven shaft mounting hole 211. The radius adjustment device 220 is installed between the two fixed disks 210, and the radius adjustment device 220 includes a first telescopic arc 223, a second telescopic arc 226 and a third telescopic arc 227, and the three telescopic arcs are all fan-shaped structures, and the first telescopic arc 223 is a box body structure with openings on both sides, and the second telescopic arc 226 and the third telescopic arc 227 are arranged up and down, and are both located in the first telescopic arc 223. The second telescopic arc 226 and the third telescopic arc 227 can be telescoped from both sides of the first telescopic arc 223 respectively. Among them, the second telescopic arc 226 located at the top is telescopic from the right side of the first telescopic arc 223, and the third telescopic arc 227 located at the bottom is telescopic from the left side of the first telescopic arc 223. The center angles of the three telescopic arcs are basically the same. The second telescopic arc 226 and the third telescopic arc 227 can be completely hidden in the first telescopic arc 223, and the three completely overlap; the second telescopic arc 226 and the third telescopic arc 227 can also be completely extended from the first telescopic arc 223, and the three telescopic arcs can be unfolded and folded like a fan. When the three telescopic arcs are unfolded, the arcs of the second telescopic arc 226 and the third telescopic arc 227 extending from the first telescopic arc 223 form an approximate arc with the arc of the first telescopic arc 223. When the bending device bends the metal sheet, the approximate arc can form a fillet corresponding to the bending radius at the bending part of the metal sheet.

[0037] First sliders 222 are fixed on both the upper and lower sides of the first telescopic arc 223. Slideways 214 extending along the front-to-back direction are respectively provided on the opposite side surfaces of the two fixed plates 210. The upper and lower first sliders 222 respectively cooperate with the slideways 214 on the upper and lower fixed plates 210, so that the first telescopic arc 223 can only move along the slideways extending along the front-to-back direction. The second gear shaft 221 and the third gear shaft 225 are fixed at the center positions of the second telescopic arc 226 and the third telescopic arc 227, respectively. An arc gear slideway 215 is correspondingly opened on one side of the driven shaft mounting hole 211 on the two fixed plates 210. The second gear shaft 221 and the third gear shaft 225 are respectively located in the corresponding arc gear slideways 215. The two driven shafts 242 are both provided with driven shaft gears. The second gear shaft 221 and the third gear shaft 225 are respectively meshed with the two driven shaft gears. When the two driven shafts 242 rotate in opposite directions, the two driven shafts 242 respectively drive the second telescopic arc 226 and the third telescopic arc 227 to rotate in opposite directions around the driven shaft 242. During this process, the second gear shaft 221 and the third gear shaft 225 move along the corresponding arc gear slideways respectively.

[0038] A second slider 224 is fixed to the upper side of the second telescopic arc 226, and a third slider is fixed to the lower side of the third telescopic arc 227. At the same time, the upper and lower sides of the first telescopic arc 223 are respectively provided with first arc-shaped slideways 229 that cooperate with the second slider and the third slider, and the second slider 224 and the third slider are respectively located in the first arc-shaped slideways. The first arc-shaped slideway 229 on the upper side gradually approaches the center of the first telescopic arc from the left end to the right end, and the first arc-shaped slideway 229 on the lower side gradually approaches the center of the first telescopic arc from the right end to the left end. When the second telescopic arc 226 and the third telescopic arc 227 are respectively extended and retracted from the first telescopic arc 223, the second telescopic arc and the third telescopic arc push the first telescopic arc 223 to move in the front-rear direction through the second slider 224 and the third slider respectively. Among them, when the three telescopic arcs are unfolded, the first telescopic arc gradually moves toward the periphery of the fixed disk 210. At this time, the radius of the approximate arc composed of the three telescopic arcs will increase, and correspondingly, the bending radius of the bent metal sheet will also be larger; conversely, when the three telescopic arcs are folded, the first telescopic arc gradually moves toward the inside of the fixed disk 210. At this time, the radius of the approximate arc composed of the three telescopic arcs will decrease, and correspondingly, the bending radius of the bent metal sheet will also be smaller.

[0039] A telescopic hydraulic cylinder 132 is fixed between the two driving hydraulic cylinders 120 of the bending device. The telescopic hydraulic cylinder 132 is telescopic and drives the two driven shafts 242 to rotate. Specifically, the telescopic end of the telescopic hydraulic cylinder 132 has a portal frame 134 that telescopes and moves in the front-to-back direction. The portal frame 134 is provided with a spiral hole, and the inner wall of the spiral hole is provided with a spiral groove. A support frame is fixed to the base frame 100, and a spiral shaft 133 is rotatably mounted on the support frame. The outer surface of the spiral shaft 133 is provided with spiral teeth matching the spiral hole, and the spiral shaft 133 is inserted into the spiral hole. When the telescopic hydraulic cylinder 132 is telescopic and retracted in the front-to-back direction, the portal frame 134 moves along the spiral shaft 133, and the front-to-back movement of the portal frame 134 drives the spiral shaft 133 to rotate. The end of the screw shaft 133 away from the telescopic hydraulic cylinder 132 is connected to a first gear, and the first gear 135 is located between the upper and lower driven shafts 242. The opposite end faces of the two driven shafts 242 respectively have end face teeth 243, and the first gear 135 cooperates with the end face teeth on the two driven shafts at the same time. When the screw shaft 133 rotates, the screw shaft 133 can simultaneously drive the two driven shafts 242 to rotate in opposite directions. The two driven shafts 242 rotate, thereby driving the radius adjustment device to expand or fold, thereby adjusting the size of the bending radius.

[0040] In this embodiment, the telescopic plate 112, the first hydraulic cylinder 111, the telescopic hydraulic cylinder 132 and the spiral shaft 133 are part of the thickness detection device, and can adjust the size of the bending radius according to the thickness of the metal sheet. The hydraulic chamber of the telescopic hydraulic cylinder 132 is connected to the inner chamber of the first hydraulic cylinder 111 of the placement device through the hose 131. When the telescopic plate 112 is extended, that is, the thickness of the metal sheet increases, the hydraulic oil in the first hydraulic cylinder 111 of the placement device will flow into the telescopic hydraulic cylinder 132 through the hose 131, so that the telescopic hydraulic cylinder 132 is extended and the spiral shaft 133 is driven to rotate forward. At this time, the three telescopic arcs of the radius adjustment device will expand to increase the bending radius; conversely, when the telescopic plate 112 is contracted, that is, the thickness of the metal sheet is reduced, the hydraulic oil in the telescopic hydraulic cylinder will flow into the hydraulic cylinder of the placement device through the hose, so that the telescopic hydraulic cylinder is contracted and the spiral shaft is driven to rotate in the opposite direction. At this time, the three telescopic arcs of the radius adjustment device will fold to reduce the bending radius, thereby realizing the adjustment of the bending radius according to the thickness of the metal sheet.

[0041] When the bending radius is adjusted according to the thickness of the metal sheet, under the action of the two bidirectional overrunning clutches 240, the telescopic hydraulic cylinder 132 drives the driven shaft to rotate, while the driving shaft 241 remains stationary. Then, when adjusting the bending angle, the bending radius also needs to be adjusted, so that the bending process requirements can be met. At this time, the driving motor drives the driving shaft 241 to rotate, thereby driving the angle adjustment device and the radius adjustment device at the same time, so that the bending radius changes with the change of the bending angle.

[0042] Specifically, there are two angle adjustment devices 230, one above and one below, and the structures of the two are the same. The one located above is installed on the upper side of the fixed plate 210 located above through a rotating shaft 235, and the other is installed on the lower side of the fixed plate 210 located below through a rotating shaft. Each angle adjustment device 230 includes a first telescopic rod 233 and a second telescopic rod 234, and the rotating shaft 235 is fixed at the front end of the first telescopic rod 233. The second telescopic rod 234 is L-shaped, one side of the second telescopic rod 234 is slidably installed in the first telescopic rod 233, and the other side constitutes a stopper 231 for limiting the bending angle of the metal sheet. The angle formed between the upper and lower stopper 231 determines the bending angle of the metal sheet when it is bent.

[0043] The front end of the first telescopic rod 233 has a fourth gear 236, and the upper and lower fourth gears 236 are respectively meshed with the teeth on the driving shaft 241, so that when the driving shaft 241 rotates, the driving shaft 241 can synchronously drive the two angle adjustment devices 230 to swing, thereby adjusting the angle between the two baffles. At the same time, under the action of the two-way overrunning clutch 240, the rotation of the driving shaft 241 will drive the corresponding driven shaft 242 to rotate, and the two driving shafts 241 rotate in opposite directions, thereby driving the radius adjustment device to operate. Specifically, when the angle between the two baffles 231 increases, the three telescopic arcs expand, so that the bending radius increases accordingly; conversely, when the angle between the two baffles decreases, the three telescopic arcs fold, so that the bending radius decreases accordingly, thereby realizing the synchronous adjustment of the bending angle and the bending radius.

[0044] During the adjustment of the bending radius, as the radius adjustment device operates, the length of the angle adjustment device also needs to change accordingly to prevent the blocking rod of the angle adjustment device from being unable to contact the metal sheet. Therefore, in this embodiment, the two second telescopic rods 234 are arranged in linkage with the second telescopic arc 226 and the third telescopic arc 227, so that when the radius adjustment device operates, the second telescopic rods are driven to telescope relative to the first telescopic rod. Specifically, a fourth slider 232 is fixed to each of the second telescopic rods 234, a second arc slide 228 corresponding to and identical to the first arc slide 229 on the upper side is provided on the second telescopic arc 226, a third arc slide corresponding to and identical to the first arc slide 229 on the lower side is provided on the third telescopic arc 227, the fourth slider 232 located at the top is located in the first arc slide and the second arc slide on the upper side, and the fourth slider located at the bottom is located in the first arc slide and the third arc slide on the lower side. During the unfolding and folding of the three telescopic arcs, the cooperation between the fourth slider and the corresponding arc-shaped slideway can drive the second telescopic rod 234 to extend or shorten, and the length of the angle adjustment device can be adaptively adjusted as the bending radius changes. Specifically, when the bending radius increases, the angle adjustment device extends; conversely, when the bending radius decreases, the angle adjustment device shortens.

[0045] It should be noted that, in order to prevent the helical shaft 133 and the first gear 135 from obstructing and interfering with the driven shaft 242 when the driving shaft 241 rotates, before driving the driving shaft 241, it is necessary to first move the punch device backwards by driving the hydraulic cylinder 120 for a certain distance to disengage the first gear from the driven shaft. Specifically, when the punch device moves backwards, since the position of the telescopic hydraulic cylinder has been determined, the helical shaft and the first gear are restricted from moving, and the first gear will disengage from between the two driven shafts, disengaging the face teeth from the first gear, thereby realizing the disengagement of the first gear from the driven shaft, and preventing the helical shaft from obstructing the rotation of the driven shaft when the driving shaft rotates.

[0046] The specific working process of the bending machine of the present invention is as follows: in the initial state, the telescopic rod 112 is retracted, and the three telescopic arcs are in a completely folded state. The first hydraulic cylinder 111 is driven and the extension length of the telescopic plate 112 is adjusted. After the metal sheet passes through the telescopic plate 112 and is placed on the placement plate, the thickness detection device 130 adjusts the radius adjustment device 220 according to the thickness of the metal sheet. When the thickness of the metal sheet is large, the expansion degree of the three telescopic arcs is also large, and the radius of the approximate arc composed of the three telescopic arcs is also large. Correspondingly, the bending radius of the metal sheet limited by the radius adjustment device is also large; otherwise, the bending radius will be small. Then the driving hydraulic cylinder 120 is operated to drive the punch device to move a certain distance toward the placement device, so that the driven shaft 242 is out of transmission with the first gear 135. Then the driving motor is started to drive the driving shaft 241 to rotate, and the driving shaft 241 simultaneously drives the angle adjustment device 230 and the radius adjustment device 220 to operate. When the bending angle of the metal sheet limited by the angle adjustment device 230 increases, the bending radius of the metal sheet limited by the radius adjustment device also increases, and vice versa. When the angle adjustment device 230 and the radius adjustment device 220 are adjusted, the driving hydraulic cylinder 120 is started to drive the punch device to move toward the placement device. The outer periphery of the first telescopic arc 223 first contacts the metal sheet and punches the metal sheet backward. As the punch device gradually moves backward, the metal sheet gradually bends. During this process, the second telescopic arc and the third telescopic arc gradually match and contact the metal sheet until the metal sheet contacts the two stop rods of the angle adjustment device respectively. At this time, the angle adjustment device limits the bending angle of the metal sheet to prevent the metal sheet from being excessively bent. The three telescopic arcs fit the inner arc surface of the bending part of the metal sheet, limiting the bending radius of the bending part. In this way, the bending angle and bending radius of the bent metal sheet can basically meet the required requirements.

[0047] The bending machine of the present invention can be applied to bending processes that do not require high bending accuracy. The bending machine can adjust the bending radius according to the thickness of the metal plate, and can adjust the bending radius while adjusting the bending angle, so that the bending radius changes with the change of the bending angle. Compared with the bending machine equipped with multiple punches in the prior art, the bending machine of the present invention can achieve stepless adjustment, has a wider range of applications, and reduces the cost of the bending machine.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bending machine for adjusting the bending radius according to the thickness, comprising a base frame, characterized in that: It also includes a placing device, a thickness detection device and a bending device, wherein the placing device is used to place the metal sheet to be bent, and the bending device is used to bend the metal sheet on the placing device, and the bending device includes a driving hydraulic cylinder, a punch device, a radius adjustment device and an angle adjustment device, wherein the radius adjustment device is used to limit the bending radius of the metal sheet when it is bent, and the angle adjustment device is used to limit the bending angle of the metal sheet when it is bent, and the punch device is installed at the end of the hydraulic rod of the driving hydraulic cylinder, and the punch device includes a fixed plate, a driving shaft and a driven shaft, and the radius adjustment device and the angle adjustment device are both movably installed on the fixed plate, the driving shaft is connected to the driven shaft through a two-way overrunning clutch, the radius adjustment device is connected to the driven shaft by transmission, and the angle adjustment device is connected to the driving shaft by transmission, and the radius adjustment device includes a first telescopic arc, a second telescopic arc and a third telescopic arc that can be relatively unfolded and folded with the rotation of the driven shaft, and the thickness detection device drives the driven shaft to rotate according to the thickness of the metal sheet to adjust the radius adjustment device, and when the driving shaft rotates, it drives the angle adjustment device to move and drives the driven shaft to rotate through the two-way overrunning clutch at the same time; The placement device includes a first hydraulic cylinder, a telescopic plate, and a placement plate. The thickness detection device includes a telescopic hydraulic cylinder and a spiral shaft. The inner cavity of the telescopic hydraulic cylinder is connected to the inner cavity of the first hydraulic cylinder through a hose. The telescopic hydraulic cylinder extends as the telescopic plate extends. The spiral shaft is rotatably arranged. The telescopic end of the telescopic hydraulic cylinder is connected to the spiral shaft. When the telescopic hydraulic cylinder is extended or retracted, the spiral shaft is driven to rotate and the driven shaft is driven to rotate. The fixed plate, the driving shaft, the driven shaft and the two-way overrunning clutch are all provided with two upper and lower intervals, one end of the spiral shaft is connected with a first gear, the first gear is located between the upper and lower driven shafts, and cooperates with the end face teeth on the two driven shafts at the same time, the radius adjustment device is arranged between the two fixed plates, the second telescopic arc and the third telescopic arc are respectively provided with a second gear shaft and a third gear shaft connected with the two driven shafts, the angle adjustment device has two upper and lower ones, and the two angle adjustment devices are respectively arranged on the upper and lower sides of the two fixed plates; The two driving shafts are respectively connected with driving motors; The first telescopic arc is a box structure with openings on both sides, the second telescopic arc and the third telescopic arc are arranged at intervals up and down and are both located inside the first telescopic arc, first sliders are fixed on the upper and lower sides of the first telescopic arc, and slideways cooperating with the first sliders are respectively provided on the opposite sides of the upper and lower fixed plates, first arc-shaped slideways are respectively provided on the upper and lower sides of the first telescopic arc, a second slider cooperating with the upper first arc-shaped slideway is provided on the upper side of the second telescopic arc, and a third slider cooperating with the lower first arc-shaped slideway is provided on the lower side of the third telescopic arc, and the second telescopic arc and the third telescopic arc are respectively driven by the second slider and the third slider to move the first telescopic arc along the slideway; The angle adjustment device is a telescopic rod structure, including a first telescopic rod and a second telescopic rod that are movably mounted together, the first telescopic rod and the second telescopic rod form an L-shaped structure, the second telescopic rod includes a stopper rod that contacts the metal plate when bent, and the second telescopic rod is linked to the radius adjustment device to drive the second telescopic rod to extend and retract relative to the first telescopic rod when the radius adjustment device is unfolded and folded.

2. The bending machine according to claim 1, characterized in that: A second arc slide corresponding to and identical to the first arc slide on the upper side is provided on the upper side of the second telescopic arc, and a third arc slide corresponding to and identical to the first arc slide on the lower side is provided on the lower side of the third telescopic arc. Fourth sliding blocks cooperating with the second arc slide and the third arc slide are respectively provided on the two second telescopic rods to realize the linkage between the second telescopic rod and the radius adjustment device.

3. The bending machine according to claim 1, characterized in that: There are two driving hydraulic cylinders spaced apart on the left and right, the fixed end of the telescopic hydraulic cylinder is fixed between the two driving hydraulic cylinders, the telescopic end of the telescopic hydraulic cylinder includes a portal frame, the screw shaft is installed above the base frame through a support frame, and a spiral hole is opened on the portal frame to cooperate with the spiral transmission of the screw shaft.

4. The bending machine according to claim 1, characterized in that: The placing device comprises two parts arranged side by side and spaced apart. The two parts of the placing device have the same structure and are symmetrically arranged. The placing device comprises a first hydraulic cylinder, a telescopic plate, a placing plate and a moving rod. A slide rail that slides with the moving rod is provided on the base frame. When the bending device bends the metal sheet, the two parts of the placing device move away from each other to allow the metal sheet to be bent and deformed.

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