Bending material blocking structure

Abstract

The utility model discloses an improved bending rear material blocking structure which comprises a rear material blocking cross beam and two guide rails, a plurality of sets of guide rail adjusting mechanisms are arranged in the rear material blocking cross beam at equal intervals in parallel, a plurality of sliding grooves corresponding to the guide rail adjusting mechanisms in position are formed in the rear material blocking cross beam, and step-shaped trapezoid corners are arranged on the side faces of the guide rails. A trapezoid angle between the two guide rails forms an inserting fixing structure used for fixing and supporting the two side edges of a plate, the laser range finder is further arranged, and the guide rail adjusting mechanism and the laser range finder are connected with a controller. The material blocking structure is applied to a material blocking plate during stamping of a bending machine, the guide rails can be provided with an automatic adjusting structure and trapezoidal corners for corresponding supporting protection, the guide rails can be disassembled, assembled and replaced, the distance between different parts of the two guide rails can be detected in real time, the guide rail adjusting mechanism and the controller are matched, fine adjustment can be conducted in time when deviation of the guide rails is detected, intelligent monitoring is achieved, and the working efficiency is improved. And the bending accuracy is guaranteed, and multiple functions are integrated.

Description

Technical Field

[0001] The utility model relates to the technical field of bending machines, in particular to a bending rear stop structure. Background Art

[0002] In the existing bending machines, high requirements are imposed on the straightness and parallelism of the rear stop Z-axis of the bending machine. The rear stop Z-axis is mainly used for accurately positioning and assisting in supporting and fixing the bent plates. After the bending machine is used for a period of time, due to the frequent impact of the plates on the stop fingers of the rear stop, the accuracy of the guide rails is affected, resulting in a deviation in the parallelism of the guide rails for stop. The main problem is that the two guide rails are displaced, affecting the sliding of the rear stop and the accuracy of positioning and fixing the position of the bent plates. Especially for the stamping and bending of high-quality aluminum alloy, magnesium, and copper plates with trapezoidal corners, which are relatively soft metal plates. Figure 1 As shown in the plate 20 of the soft material with a trapezoidal corner cross-section, during stamping and bending, it is necessary to protect the uniform force support of the edge angle to prevent the deformation of the edge. Therefore, the fixing accuracy requirements for the rear stop of the plate with trapezoidal corners are even higher.

[0003] In the past, when adjusting the guide rails, it was necessary to rely on a wrench to loosen the bolts and then use a hammer to knock for adjustment. During the adjustment process, it was necessary to repeatedly measure the distance between the guide rails to ensure parallelism, which was difficult to control and the effect was not ideal. When the force was slightly larger, the entire structure was prone to deviating to one side, making it inconvenient for fine adjustment. And due to the inability to perform real-time detection, when it was found that the guide rails were displaced, many non-standard plates had often been bent, which not only wasted the plate cost, affected the construction period, but also reduced the qualified rate. It was also necessary to spend time checking each of the bent plates one by one. The overall intelligence of the equipment was not highly utilized, and its compatibility with automated production equipment was also low. Therefore, it is necessary to provide a rear stop structure for trapezoidal corner plate bending that can detect the distance between the guide rails in real time and automatically fine-tune the guide rails. Summary of the Utility Model

[0004] In order to solve the problems in the above background art and be applicable to the stamping and bending of high-quality aluminum alloy, magnesium, and copper plates with trapezoidal corners, the technical solution adopted by the utility model to solve the technical problems is:

[0005] A bending rear stop structure includes a rear stop cross beam and two guide rails installed in parallel on the top of the rear stop cross beam. Inside the rear stop cross beam, multiple groups of guide rail adjusting mechanisms are arranged in parallel at the same interval. Multiple chutes corresponding to the positions of the guide rail adjusting structures are provided on the rear stop cross beam. Each guide rail is connected to the top of each guide rail adjusting mechanism through the chute. A stepped trapezoidal angle is provided on the side of each guide rail. The trapezoidal angles between the two guide rails form a plug-in fixing structure for fixedly supporting both sides of the plate. A laser rangefinder with a position and quantity corresponding one-to-one to the guide rail adjusting mechanism is further provided on the side of one of the guide rails. The detection end of the laser rangefinder vertically faces the opposite guide rail. The guide rail adjusting mechanism and the laser rangefinder are respectively connected to a controller. The guide rail adjusting mechanism, the laser rangefinder, and the controller cooperate to form an adjusting structure for automatically adjusting the distance between different parts of the guide rail. The laser rangefinder is an existing mature technology and is not uniquely limited here. The trapezoidal angle on the side of the guide rail can be a special-shaped structural groove of different shapes to adapt to the use of plates with different side structures, playing a role in fixing and assisting in supporting the side plates of the plate, making the plate more evenly stressed during bending, preventing the side of the plate from being deformed and damaged due to overly concentrated pressure points, and the guide rail can be replaced for plates with different side shapes through the mounting block.

[0006] Preferably, a guide groove is provided inside the rear stop cross beam below each chute. Each guide rail adjusting mechanism is correspondingly installed in the corresponding guide groove. The width of the chute is greater than the width of the mounting block, enabling the mounting block to drive the guide rail to perform fine adjustment movement along with the movement of the adjusting block.

[0007] Preferably, each guide rail adjusting mechanism includes an adjusting block, a mounting block, and an adjusting screw rod. The adjusting block is in sliding connection with the inner side of the guide groove in a fitting manner. The mounting block is fixedly connected to the upper end of the adjusting block located on one side of the chute through a screw. The adjusting screw rod is in threaded connection with the inside of one end of the adjusting block. By connecting the adjusting screw rod to the end of the adjusting block, when the adjusting screw rod rotates, it drives the adjusting block to move back and forth in the guide groove, thereby realizing fine adjustment of the position of the guide rail.

[0008] Preferably, a shaft groove is provided at one end of the rear stop cross beam where the adjusting screw rod is located. A bearing is installed inside the shaft groove. One end of the adjusting screw rod penetrates and is connected to the bearing. The adjusting screw rod is sleeved and fixed inside the inner ring of the bearing by means of bonding or welding to prevent the adjusting screw rod from moving back and forth, and at the same time, the bearing ensures that the adjusting screw rod can rotate.

[0009] Preferably, a driving motor is connected to the outer end of the adjusting screw rod located outside the rear material baffle cross beam. The number of the guiding grooves corresponds to that of the sliding grooves one by one, and several guiding grooves and sliding grooves are provided. The driving motor is connected to the controller. The driving motor can rotate forward or backward after comparison by the controller according to the data measured by the laser rangefinder, so as to adjust the distance between the guide rails.

[0010] Preferably, an installation block is fitted and slidably connected to the inner side of the sliding groove. The length of the installation block is less than the inner length of the sliding groove, and the length of the adjusting block is less than the inner length of the guiding groove. This provides enough space in the guiding groove for the adjusting block to move.

[0011] Preferably, an internal thread is provided on the upper side of one end of the adjusting block, and the internal thread penetrates through the installation block. The installation block is fitted and slidably connected to the inner side of the sliding groove. The length of the installation block is less than the inner length of the sliding groove, and the length of the adjusting block is less than the inner length of the guiding groove, which is convenient for the adjusting block to make fine adjustments.

[0012] Preferably, a perforation is provided on the side of the guide rail corresponding to the internal thread, and a fixing screw rod slides through the perforation. The fixing screw rod penetrates through the perforation and is threadedly connected to the internal thread. A plurality of perforations are provided.

[0013] Preferably, a fastening hole is provided on one side of the rear material baffle cross beam directly above the guiding groove. A fastening screw rod is threadedly connected to the fastening hole, and the fastening screw rod threadedly extends into the guiding groove to contact the adjusting block. Each guide rail is slidably connected with a guide rail slider, and a material baffle finger is installed at the upper end of the guide rail slider. The fastening screw rod threadedly extends into the guiding groove to contact the adjusting block. The adjusting block can be pressed down by the fastening screw rod, so as to fix the adjusting block, effectively avoiding the movement of the adjusting block. The guide rail is slidably connected with a guide rail slider, and a material baffle finger is installed at the upper end of the guide rail slider. By adjusting the distance between the guide rails, different types of material baffle fingers can be adaptively replaced, with strong adaptability.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The material blocking structure of the present utility model is applied to the material blocking plate during the stamping of a bending machine, and can achieve an automatic adjustment structure for the guide rails and corresponding support and protection for the trapezoidal angles. The guide rails can be disassembled and replaced. Laser rangefinders are provided at multiple positions on the guide rails, which can detect the distances between different parts between the two guide rails in real time, prevent the guide rails from shifting and resulting in defective products, and eliminate the need for manual repeated measurement. In cooperation with the guide rail adjustment mechanism and the controller, when the guide rail shift is detected, fine adjustment can be performed in a timely manner, reducing the adjustment time and the downtime of the bending machine, improving production efficiency, realizing intelligent monitoring, and ensuring bending accuracy. It can effectively clamp and fix soft material plates and support and protect the trapezoidal angles. The drive motor rotates forward and backward according to the data of the laser rangefinder, and after comparison by the controller, finely adjusts the distance between the guide rails to improve accuracy, integrating multiple functions into one. It can be adapted to replace material blocking fingers of different sizes and models, with strong adaptability, and is suitable for stamping and bending of high-quality plates with trapezoidal angles.

[0016] The use of the present utility model realizes the integration of real-time monitoring and automatic adjustment in the automatic monitoring and adjustment method of the guide rails. During the working process of the bending machine, the distances between different parts between the two guide rails are monitored and adjusted in real time, avoiding the situation where manual inspection and adjustment are required after the machine stops. The adjustment is fast, timely, and highly accurate, effectively improving production efficiency and the yield rate of plate bending.

[0017] Adopting the material blocking structure, a simple and practical stamping and bending processing method for aluminum alloy, magnesium material, or copper material plates with trapezoidal angles can be realized, and the bending quality can be guaranteed, and it can be used in supporting with automated intelligent equipment. Brief Description of the Drawings

[0018] Figure 1 It is a side view of the overall structure of the present utility model and the plate;

[0019] Figure 2 It is a schematic diagram of the overall structure of the present utility model Figure 2 ;

[0020] Figure 3 It is a schematic diagram of the partial cross-sectional structure of the rear material blocking crossbeam of the present utility model;

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the adjusting block of the present utility model.

[0022] 1. Rear material blocking crossbeam; 2. Guide groove; 3. Slide groove; 4. Shaft groove; 5. Adjusting block; 6. Mounting block; 7. Bearing; 8. Adjusting lead screw; 9. Drive motor; 10. Internal thread; 11. Fastening hole; 12. Guide rail; 13. Perforation; 14. Fixed lead screw; 15. Guide rail slider; 16. Material blocking finger; 17. Fastening lead screw; 18. Laser rangefinder; 19. Trapezoidal angle; 20. Plate. Detailed Embodiment

[0023] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] The present utility model will be further described below in conjunction with the accompanying drawings.

[0026] Embodiment 1, please refer to Figures 1 - 4 , a bent rear stop structure, including a rear stop cross beam 1 and two guide rails 12 installed parallel to each other on the top of the rear stop cross beam 1. A plurality of groups of guide rail adjusting mechanisms are arranged parallel to each other at the same interval inside the rear stop cross beam 1. A plurality of chutes 3 corresponding to the positions of the guide rail adjusting structures are arranged on the rear stop cross beam 1. Each of the guide rails 12 is connected to the top of each of the guide rail adjusting mechanisms through the chute 3. A stepped trapezoidal angle 19 is arranged on the side of each of the guide rails 12. The trapezoidal angles 19 between the two guide rails 12 form a plug-in fixing structure for fixedly supporting both sides of the plate 20. A laser rangefinder 18 corresponding in position and quantity to the guide rail adjusting mechanism is also arranged on the side of one of the guide rails 12. The detection end of the laser rangefinder 18 vertically faces the other corresponding guide rail 12. The guide rail adjusting mechanism and the laser rangefinder 18 are respectively connected to a controller. The guide rail adjusting mechanism, the laser rangefinder 18 and the controller cooperate to form an adjusting structure for automatically adjusting the distance between different parts of the guide rail 12. The laser rangefinder 18 is a mature existing technology and is not uniquely limited here. The plate 20 between the two guide rails 12 is located directly below the bending part of the bending machine when it presses down for bending.

[0027] A guide groove 2 is provided inside each rear material baffle cross beam 1 below the corresponding sliding groove 3, and each of the guide rail adjusting mechanisms is correspondingly installed in the corresponding guide groove 2. The width of the sliding groove 3 is greater than the width of the mounting block 6, so that the mounting block 6 can drive the guide rail 12 to make fine adjustment movements along with the movement of the adjusting block 5.

[0028] Each of the guide rail adjusting mechanisms includes an adjusting block 5, a mounting block 6, and an adjusting lead screw 8. The adjusting block 5 is in sliding connection with the inner side of the guide groove 2 in a fitting manner. The mounting block 6 is fixedly connected to the upper end of the adjusting block 5 on one side of the sliding groove 3 by screws, and the adjusting lead screw 8 is in threaded connection with the inside of one end of the adjusting block 5. By connecting the adjusting lead screw 8 to the end of the adjusting block 5, when the adjusting lead screw 8 rotates, it drives the adjusting block 5 to move back and forth in the guide groove 2, thereby realizing the fine adjustment of the position of the guide rail 12.

[0029] An axial groove 4 is provided at one end of the rear material baffle cross beam 1 where the adjusting lead screw 8 is located, and a bearing 7 is installed inside the axial groove 4. One end of the adjusting lead screw 8 penetrates and is connected to the bearing 7. The adjusting lead screw 8 is sleeved and fixed inside the inner ring of the bearing 7 by means of bonding or welding to prevent the adjusting lead screw 8 from moving back and forth, and at the same time, the bearing 7 ensures that the adjusting lead screw 8 can rotate.

[0030] One end of the adjusting lead screw 8 located outside the rear material baffle cross beam 1 is connected to a driving motor 9. The number of the guide grooves 2 and the sliding grooves 3 are correspondingly provided in several numbers, and the driving motor 9 is connected to the controller. The driving motor 9 can rotate forward or backward through comparison by the controller according to the data measured by the laser rangefinder 18, thereby realizing the adjustment of the distance between the guide rails 12.

[0031] The inner side of the sliding groove 3 is in sliding connection with the mounting block 6 in a fitting manner. The length of the mounting block 6 is less than the inner length of the sliding groove 3, and the length of the adjusting block 5 is less than the inner length of the guide groove 2. This provides enough space in the guide groove 2 for the adjusting block 5 to move.

[0032] An internal thread 10 is provided on the upper side of one end of the adjusting block 5, and the internal thread 10 penetrates through the mounting block 6. The inner side of the sliding groove 3 is in sliding connection with the mounting block 6 in a fitting manner. The length of the mounting block 6 is less than the inner length of the sliding groove 3, and the length of the adjusting block 5 is less than the inner length of the guide groove 2, which is convenient for the adjusting block 5 to make fine adjustments. The trapezoidal angle 19 on the side of the guide rail 12 can be a special-shaped structural groove of different shapes, which plays a role in fixing and auxiliary supporting the side plate of the plate 20, so as to adapt to the use of plates 20 with different side structures. The guide rail 12 can be replaced for plates 20 with different side shapes through the mounting block 6.

[0033] The guide rail 12 is provided with a perforation 13 on one side corresponding to the internal thread 10. A fixing screw rod 14 is slidably penetrated through the perforation 13. The fixing screw rod 14 penetrates through the perforation 13 and is threadedly connected to the internal thread 10. The number of the perforations 13 is set to be several.

[0034] A fastening hole 11 is clamped on one side of the rear material baffle cross beam 1 above the guiding groove 2. A fastening screw rod 17 is threadedly connected inside the fastening hole 11. The fastening screw rod 17 threadedly extends into the guiding groove 2 and contacts the adjusting block 5. Each of the guide rails 12 is slidably connected with a guide rail slider 15. A material baffle finger 16 is installed at the upper end of the guide rail slider 15. The fastening screw rod 17 threadedly extends into the guiding groove 2 and contacts the adjusting block 5. By the fastening screw rod 17, it can be pressed down on the adjusting block 5, and thus the adjusting block 5 can be fixed effectively, and the movement of the adjusting block 5 can be avoided effectively. The guide rail 12 is slidably connected with the guide rail slider 15, and the material baffle finger 16 is installed at the upper end of the guide rail slider 15. The material baffle finger 16 is used for limiting the sheet material 20 and playing a role in discharging the sheet material 20 at the same time.

[0035] A method for automatically monitoring and adjusting the guide rail of a trapezoidal angle plate bending rear material baffle structure as described above includes the following steps:

[0036] S1. Each laser rangefinder 18 measures the distance between two corresponding guide rails 12 in real time, and transmits the measured data to the controller.

[0037] S2. When the distance measured by the laser rangefinder 18 differs from the predetermined distance between the two guide rails 12 by a certain value, the controller starts the driving motor 9 to drive the adjusting screw rod 8 to rotate, and then drives the adjusting block 5 to move, so as to realize the fine adjustment of the position of the part of the guide rail 12 connected through the corresponding mounting block 6.

[0038] S3. When the data measured by the laser rangefinder 18 is less than the predetermined distance between the guide rails 12, the driving motor 9 rotates forward to pull the two guide rails 12 away from each other. When the data measured by the laser rangefinder 18 is greater than the predetermined distance between the guide rails 12, the driving motor 9 rotates reversely to pull the two guide rails 12 closer to each other until the data measured by the laser rangefinder 18 is the same as the predetermined distance between the two guide rails 12.

[0039] Embodiment 2. Based on Embodiment 1, a stamping and bending processing method for aluminum alloy, magnesium material or copper material sheets with trapezoidal angles:

[0040] S1. Select the corresponding guide rail 12 according to the trapezoidal angle 19 on the side of the sheet material 20 and install it on the mounting block 6. The controller pre-sets the gap between the two guide rails 12 into a distance corresponding to the width of the sheet material 20, and the laser rangefinder 18 cooperates with the guide rail adjusting mechanism to adjust the two guide rails 12 to the preset interval distance.

[0041] S2. Insert and slide the trapezoidal corners 19 on both sides of the sheet 20 corresponding to the two guide rails 12. At the same time, the position of the sheet 20 can be limited by adjusting the position of the material stop finger 16 on the guide rail 12.

[0042] S3. The bending machine operates (not shown in the figure, generally located in the front of the backgauge structure), and punches and bends one end of the sheet 20 made of trapezoidal corner aluminum alloy, magnesium material or copper material. The trapezoidal corners 19 of the guide rail 12 not only fix the sheet 20, but also provide a full-wrap support for both sides of the side of the sheet 20, making the sheet 20 more evenly stressed during bending and preventing the side of the sheet 20 from being deformed and damaged due to overly concentrated pressure points.

[0043] S4. During the bending process, if the guide rail 12 is displaced, the laser rangefinder 18 can detect it in time and cooperate with the guide rail adjustment mechanism to adjust the position of the guide rail 12 in real time, effectively improving the accuracy of bending the sheet 20.

[0044] S5. After the sheet is bent, move the material stop finger 16 to push the sheet 20 out of the trapezoidal corners 19 of the guide rail 12 to complete the material discharging.

[0045] The backgauge structure of the present utility model is applied to the backgauge plate during the stamping of the bending machine, and can achieve an automatic adjustment structure for the guide rail and corresponding support and protection for the trapezoidal corners. The guide rail can be disassembled and replaced. Laser rangefinders are provided at multiple positions on the guide rail to detect the distances between different parts between the two guide rails in real time, preventing the guide rail from shifting and resulting in defective products, eliminating the need for manual repeated measurement. Cooperating with the guide rail adjustment mechanism and the controller, when the guide rail is detected to be displaced, it can be finely adjusted in time, reducing the adjustment time and the downtime of the bending machine, improving the production efficiency, realizing intelligent monitoring, ensuring the bending accuracy, being able to effectively clamp, fix and position the softer material sheets and provide support and protection for the trapezoidal corners. The driving motor rotates forward and backward according to the data of the laser rangefinder and after being compared by the controller, finely adjusting the distance between the guide rails to improve the accuracy. It integrates multiple functions. It can be adapted to replace the material stop fingers of different sizes and models, with strong adaptability, and is suitable for the stamping and bending of high-quality sheets with trapezoidal corners.

[0046] The automatic monitoring and adjustment method of the guide rail of the present utility model integrates real-time monitoring and automatic adjustment, realizes the real-time monitoring and adjustment of the distances between different parts between the two guide rails during the operation of the bending machine, avoids the situation of manual inspection and adjustment after shutdown, and the adjustment is fast, timely and highly accurate, effectively improving the production efficiency and the yield rate of the sheet bending.

[0047] The stamping and bending processing method for sheets made of trapezoidal corner aluminum alloy, magnesium material or copper material based on the backgauge structure is simple, practical, can ensure the bending quality, and can be used in combination with automated intelligent equipment.

[0048] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

[0049] The other parts not detailed in the present utility model belong to the prior art, so they will not be elaborated here.

[0050] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A bending back stop structure, comprising a back stop crossbeam (1) and two guide rails (12) mounted parallel to each other on the top of the back stop crossbeam (1), characterized in that: A plurality of guide rail adjustment mechanisms are arranged in parallel with each other at the same interval inside the rear stop crossbeam (1); a plurality of slide grooves (3) corresponding to the positions of the guide rail adjustment structures are arranged on the rear stop crossbeam (1); each guide rail (12) is connected to the top of each guide rail adjustment mechanism via the slide groove (3); a stepped trapezoidal angle (19) is arranged on the side of each guide rail (12); the trapezoidal angle (19) between two guide rails (12) forms a plug-in fixing structure for fixing the two side edges of the support plate (20).

2. The bending rear stopper structure according to claim 1, characterized in that: The side of one of the guide rails (12) is also provided with a laser rangefinder (18) whose position and number correspond to the guide rail adjustment mechanism. The detection end of the laser rangefinder (18) is vertically oriented to the guide rail (12) on the other side. The guide rail adjustment mechanism and the laser rangefinder (18) are respectively connected to a controller. The guide rail adjustment mechanism, the laser rangefinder (18) and the controller cooperate to form an adjustment structure for automatically adjusting the distance between different parts of the guide rail (12). A guide groove (2) is provided inside the rear stop beam (1) below each of the slide grooves (3). Each of the guide rail adjustment mechanisms is installed in the corresponding guide groove (2) in a one-to-one correspondence.

3. The bending rear stopper structure according to claim 1, characterized in that: Each of the guide rail adjustment mechanisms comprises an adjustment block (5), a mounting block (6), and an adjustment screw (8); the adjustment block (5) is slidably connected to the inner side of the guide groove (2); the mounting block (6) is fixedly connected to the upper end of the adjustment block (5) and is located on one side of the slide groove (3) by means of screws; and the adjustment screw (8) is threadedly connected to the inside of one end of the adjustment block (5).

4. The bending rear stopper structure according to claim 3, characterized in that: The rear stop cross beam (1) is provided with an axial groove (4) at one end of the adjusting screw rod (8), a bearing (7) is installed inside the axial groove (4), and one end of the adjusting screw rod (8) passes through and connects to the bearing (7).

5. The bending rear stopper structure according to claim 4, characterized in that: The adjusting screw rod (8) is located outside the rear stop beam (1) and is connected to a driving motor (9) at one end. A plurality of guide grooves (2) and slide grooves (3) are provided in a one-to-one correspondence. The driving motor (9) is connected to a controller.

6. The bending rear stopper structure according to claim 3, characterized in that: The inner side of the slide groove (3) is fitted with a sliding connection mounting block (6), the length of the mounting block (6) is smaller than the inner side length of the slide groove (3), and the length of the adjustment block (5) is smaller than the inner side length of the guide groove (2).

7. The back-bending stopper structure according to claim 3 is characterized in that: The adjusting block (5) is located on the upper side of one end of the mounting block (6) and is provided with an internal thread (10), and the internal thread (10) penetrates the mounting block (6).

8. The bending rear stopper structure according to claim 2, characterized in that: A through hole (13) is provided on one side of the guide rail (12) corresponding to the internal thread (10), a fixed screw rod (14) is slidably passed through the inside of the through hole (13), the fixed screw rod (14) passes through the through hole (13) and is threadedly connected to the inside of the internal thread (10), and the number of the through holes (13) is set to be several.

9. The bending rear stopper structure according to claim 5, characterized in that: The rear material stop cross beam (1) is provided with a fastening hole (11) on one side above the guide groove (2), and a fastening screw (17) is threadedly connected to the inside of the fastening hole (11). The fastening screw (17) is threadedly extended to the inside of the guide groove (2) to contact the adjustment block (5), and each of the guide rails (12) is slidably connected to a guide rail slider (15), and a material stop finger (16) is installed on the upper end of the guide rail slider (15).

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