A protection device for an upper roll universal plate bending machine and its usage method

Abstract

The present invention discloses a protection device for an upper roll universal plate bending machine and its usage method, which relates to the technical field of metal stamping. It includes a base, a lower roll mechanism, an upper roll mechanism, a tipping mechanism and a protection mechanism. The lower roll mechanism is arranged on the base, the upper roll mechanism is erected on the lower roll mechanism. The tipping mechanism includes an oil cylinder, a pull rod, a joint, a pin shaft, an ear plate, a limit seat and an oil cylinder base. The protection mechanism includes a cleaning oil component, a bending measurement component and an oil collection box. The cleaning oil component is arranged on the joint and the pin shaft for blocking and cleaning the oil stain between the joint and the pin shaft. The bending measurement component is arranged on the limit seat for detecting the state of the pull rod. The cleaning oil component is fixed on the base and arranged relative to the shaft end of the upper roll mechanism for collecting the oil drops during the operation of the upper roll mechanism. The present invention can be used to protect the tipping mechanism and the upper roll mechanism of the plate bending machine, improving the safety of use.

Description

Technical Field

[0001] The invention relates to the technical field of metal stamping, and in particular to a protective device for an upper roller universal plate rolling machine and a use method thereof. Background Art

[0002] The upper roller universal plate rolling machine adopts upper roller lifting hydraulic transmission and horizontal movement (mechanical transmission), driven by the lower roller, and has an electrical centralized control operating system. It can complete the pre-bending of both ends of the plate and the rolling of cylindrical and arc-shaped workpieces at one time. It can also perform certain shaping and leveling on the metal sheet, with the effect of direct pre-bending, saving trouble and material. It is equipped with NC system control and has a high degree of automation.

[0003] The working principle of the upper roller universal plate rolling machine is very simple. After the upper roller is lifted, the plate is placed between the upper roller and the lower roller. After the position is corrected, the upper roller is pressed down to the surface of the plate, and the lower roller rotates forward and reversely to drive the plate to feed and discharge. During the movement, the plate is bent by the upper and lower rollers to achieve plate shaping.

[0004] The upper roller universal plate rolling machine will bear a large load when working, so many faults will occur in the plate rolling machine during use. The more common ones are motor shutdown or safety pin cutting caused by excessive downward pressure of the upper roller or overload. Such faults can generally be avoided by the plate rolling machine's own insurance measures; the other is bearing failure. Because the upper and lower rollers are large in size, the bearings used are large in volume and require a large amount of lubricating oil. It is inevitable that lubricating oil will splash onto the surface of the shaft during the operation of the plate rolling machine. After the flap mechanism is activated, the upper roller shaft is exposed to the air. If there are too many oil stains attached to the surface, it will stick to impurities in the air. Over time, too many attached impurities will wear the bearings and shorten the bearing life. For the rotating shaft of the flap mechanism, if there are oil stains and impurities on the surface of the cylinder shaft, the workload of the cylinder will increase. Summary of the invention

[0005] The object of the present invention is to provide a protective device for an upper roller universal plate rolling machine and a method of using the same, so as to solve the problems raised in the above-mentioned background technology.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: A protection device for an upper roll universal plate bending machine and its usage method, including a base, a lower roll mechanism, an upper roll mechanism, a tipping mechanism, and a protection mechanism. Among them, the lower roll mechanism is arranged on the base, the upper roll mechanism is mounted on the lower roll mechanism, and the tipping mechanism includes an oil cylinder, a pull rod, a joint, a pin shaft, an ear plate, a limit seat, and an oil cylinder base. Among them, the oil cylinder is arranged on one side of the base through the oil cylinder base, one end of the pull rod is connected to the oil cylinder, and the other end is connected to the joint. Both ends of the pin shaft are fixed on one side of the upper roll mechanism through the ear plate. The joint is sleeved on the pin shaft and is rotationally matched with it. The limit seat is fixed on one side of the base and is arranged relative to the pull rod;

[0007] Furthermore, the protection mechanism includes a cleaning oil component, a bending measurement component, and an oil liquid collection box. Among them, the cleaning oil component is arranged on the joint and the pin shaft, and is used to block and clean the oil stains between the joint and the pin shaft. The bending measurement component is arranged on the limit seat and is used to detect the state of the pull rod. The cleaning oil component is fixed on the base and is arranged relative to the shaft end of the upper roll mechanism, and is used to collect the oil liquid dripping during the operation of the upper roll mechanism.

[0008] Furthermore, the cleaning oil component includes an infusion box, two liquid storage boxes, and two switch boxes. Among them, the infusion box is arranged on the upper side of the joint. The liquid storage boxes are respectively fixed on both sides of the joint and are rotationally matched with the pin shaft. The switch boxes are arranged in cooperation with the liquid storage boxes and are fixed on the pin shaft. A circular hole one for matching the pin shaft is opened in the middle of the liquid storage box. An annular cavity for storing cleaning liquid is arranged inside the liquid storage box. A switch groove is opened on the surface of the annular cavity. Four arc-shaped grooves are opened on the four sides of the liquid storage box. The switch box is of a round cover structure. A circular hole two for matching the pin shaft is opened in the middle of the switch box. A slider for matching the switch groove is arranged on the inner wall of the switch box. The switch box is filled with a cleaning cotton block, and the outside of the switch box is matched with the arc-shaped groove.

[0009] Furthermore, the annular cavity is communicated with the liquid storage box through a hose built in the joint. The liquid storage box is used to store the cleaning liquid and is internally provided with an output device for inputting the internal cleaning liquid into the annular cavity. A liquid level monitoring module is arranged in the annular cavity for monitoring the liquid level of the cleaning liquid. The slider occupies half the size of the switch groove.

[0010] Furthermore, the bending measurement component includes a fixed box, a flipping box, a flipping rod, a driving rod, several pulley groups, a driving motor, and two groups of infrared ranging modules. Among them, the fixed box is arranged on the limit seat. One end of the flipping box is fixed on the flipping rod. The driving rod is arranged corresponding to the flipping rod. The flipping rod and the driving rod are rotatably arranged on the limit seat. The driving motor is arranged corresponding to the driving rod. The pulley groups are arranged on the flipping rod, the driving rod, and the driving motor. The infrared ranging modules are arranged on the opposite faces of the fixed box and the flipping box.

[0011] Further, when the fixed box and the flipping box are fitted together, they form a hollow cube structure. The infrared distance measurement module includes a transmitting unit and a receiving unit. Two sets of transmitting units are arranged on two adjacent surfaces near the hollow position of the cube, and two receiving units are arranged on the other two surfaces. The infrared distance measurement module is used to detect whether there is local bending before and after the pull rod is driven.

[0012] Further, the oil collecting box includes a box body, a pressure detection module, several springs and a sliding box. The pressure detection module is arranged at the bottom of the box body. The springs connect the pressure detection module and the bottom of the sliding box, and the sliding box is slidably matched with the box body.

[0013] Further, a supporting roller assembly is arranged on the lower side of the lower roller mechanism to provide additional supporting force for the lower roller mechanism.

[0014] Further, a calibration assembly is arranged on the discharging side of the base to correct the feeding direction of the material.

[0015] Further, the specific method is as follows:

[0016] ① Working method of the cleaning oil assembly: After the plate rolling machine finishes processing, the tipping mechanism starts. The joint pulls the pin shaft to drive the bearing cover at the end of the upper roller mechanism to move outward. During this period, relative rotation occurs between the liquid storage box and the switch box. The slider slides upward, causing the bottom opening of the switch groove. The internal cleaning liquid flows out and is absorbed by the cleaning cotton block. The liquid level monitoring module in the annular cavity detects whether the cleaning liquid flows out normally. After the material is taken, the tipping mechanism resets. During this period, the slider moves downward to re-seal the bottom opening of the switch groove. At the same time, the cleaning cotton block cleans the pin shaft, the inside of the switch box and the surface of the liquid storage box under rotational extrusion, blocking the oil and gas and dust impurities infiltrated by cleaning. After resetting, the liquid infusion box replenishes the cleaning liquid into the annular cavity.

[0017] ② Working method of the bending measurement assembly: Before the tipping mechanism works, two infrared distance measurement modules detect the distance to the pull rod to establish a spatial coordinate system and lock the local position of the pull rod. After the tipping mechanism works, the infrared distance measurement module detects the position of the pull rod again and compares it with the previous set of data to judge whether the pull rod is reset. If it is not reset, it is judged whether the pull rod has an overall offset or a local bending offset from its original position, and the result is fed back for timely processing.

[0018] ③ Working method of the oil collecting box: The oil collecting box is used to detect whether there is oil leakage from the end of the upper roller mechanism during the operation of the plate rolling machine (sheet metal processing and flipping the cover). By collecting the leaked oil and detecting the total amount of leaked oil, the bearing oil leakage situation is judged. That is, if the pressure detection module of the oil collecting box detects the dripping of oil, it can be judged that there is oil attached to the surface of the end of the upper roller mechanism and needs to be cleaned. If a large amount of oil leakage is detected, it can be judged that the bearing is damaged and the internal sealed lubricating oil leaks, and maintenance is required.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: By providing a protection mechanism, the oil cleaning component can cooperate with the tipping mechanism to block and clean the infiltrating oil gas and dust impurities to prevent blockage between the pin shaft and the joint, effectively reducing the working stress of the tipping mechanism; the bending measurement component can detect whether there is local bending before and after the driving of the pull rod, analyze the bending type and report it, avoiding the situation of the pull rod breaking; the oil liquid collection box can judge oil leakage and detect the amount of oil leakage, and based on this, analyze the surface state of the upper roller and whether the bearing is damaged, providing guarantee for the normal operation of the plate rolling machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0021] Figure 1 is the overall structural schematic diagram of the present invention;

[0022] Figure 2 is the partial schematic diagram of the oil cleaning component of the present invention;

[0023] Figure 3 is the schematic diagram of a group of liquid storage boxes and switch boxes of the present invention;

[0024] Figure 4 is the schematic diagram of the bending measurement component of the present invention;

[0025] Figure 5 is the schematic diagram of the oil liquid collection box of the present invention;

[0026] In the figure: 1, base; 2, lower roller mechanism; 3, upper roller mechanism; 4, tipping mechanism; 41, oil cylinder; 42, pull rod; 43, joint; 44, pin shaft; 45, ear plate; 46, limit seat; 47, oil cylinder base; 5, oil cleaning component; 51, liquid infusion box; 52, liquid storage box; 521, circular hole one; 522, annular cavity; 523, switch groove; 524, arc groove; 53, switch box; 531, circular hole two; 532, slider; 533, cleaning cotton block; 6, bending measurement component; 61, fixed box; 62, flipping box; 63, flipping rod; 64, driving rod; 65, pulley group; 66, driving motor; 67, infrared ranging module; 7, oil liquid collection box; 71, box body; 72, spring; 73, sliding box; 8, idler roller assembly; 9, alignment component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solution of the present invention will be further described in detail in conjunction with the preferred embodiments and their accompanying drawings in a non-limiting manner. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0028] Please refer to Figures 1-5 , the present invention provides a technical solution: a protection device for an upper roll universal plate bending machine and its usage method, including a base 1, a lower roll mechanism 2, an upper roll mechanism 3, a tipping mechanism 4, and a protection mechanism. Among them, the lower roll mechanism 2 is arranged on the base 1, the upper roll mechanism 3 is erected on the lower roll mechanism 2, and the tipping mechanism 4 includes an oil cylinder 41, a pull rod 42, a joint 43, a pin shaft 44, an ear plate 45, a limit seat 46, and an oil cylinder base 47. Among them, the oil cylinder 41 is arranged on one side of the base 1 through the oil cylinder base 47, one end of the pull rod 42 is connected to the oil cylinder 41, and the other end is connected to the joint 43. Both ends of the pin shaft 44 are fixed on one side of the upper roll mechanism 3 through the ear plate 45. The joint 43 is sleeved on the pin shaft 44 and is rotationally matched with it. The limit seat 46 is fixed on one side of the base 1 and is arranged relative to the pull rod 42;

[0029] The protection mechanism includes a cleaning oil component 5, a bending measurement component 6, and an oil liquid collection box 7. Among them, the cleaning oil component 5 is arranged on the joint 43 and the pin shaft 44 for blocking and cleaning the oil stains between the joint 43 and the pin shaft 44. The bending measurement component 6 is arranged on the limit seat 46 for detecting the state of the pull rod 42. The cleaning oil component 5 is fixed on the base 1 and is arranged relative to the shaft end of the upper roll mechanism 3 for collecting the oil liquid dripping during the operation of the upper roll mechanism 3.

[0030] The cleaning oil component 5 includes an infusion box 51, two liquid storage boxes 52, and two switch boxes 53. Among them, the infusion box 51 is arranged on the upper side of the joint 43. The liquid storage boxes 52 are respectively fixed on both sides of the joint 43 and are rotationally matched with the pin shaft 44. The switch boxes 53 are arranged in cooperation with the liquid storage boxes 52 and are fixed on the pin shaft 44. A circular hole 521 for cooperating with the pin shaft 44 is opened in the middle of the liquid storage box 52. An annular cavity 522 for storing cleaning liquid is arranged inside the liquid storage box 52. A switch groove 523 is opened on the surface of the annular cavity 522. Four arc-shaped grooves 524 are opened on the four sides of the liquid storage box 52. The switch box 53 is of a round cover structure. A circular hole 531 for cooperating with the pin shaft 44 is opened in the middle of the switch box 53. A slider 532 for cooperating with the switch groove 523 is arranged on the inner wall of the switch box 53. The inside of the switch box 53 is filled with a cleaning cotton block 533. The outside of the switch box 53 is matched with the arc-shaped groove 524.

[0031] It should be further noted that: The annular cavity 522 is connected to the liquid storage box 52 through a hose built into the joint 43. The liquid storage box 52 is used to store the cleaning liquid and is internally provided with an output device for inputting the internal cleaning liquid into the annular cavity 522. A liquid level monitoring module is arranged in the annular cavity 522 for monitoring the liquid level of the cleaning liquid. The slider 532 occupies half of the size of the switch slot 523.

[0032] In actual operation, when the joint 43 pulls the pin shaft 44, the liquid storage box 52 and the switch box 53 will rotate relative to each other. The slider 532 slides upward to open the bottom opening of the switch slot 523, and the internal cleaning liquid flows out and is absorbed by the cleaning cotton block 533. After the joint 43 pushes the pin shaft 44 to reset, the slider 532 re-seals the bottom of the switch slot 523. The cleaning cotton block 533 with cleaning liquid will clean the inner wall of the switch box 53 and the surface of the pin shaft 44 during the rotation process, blocking the oil and gas and dust impurities seeping in to prevent blockage between the pin shaft 44 and the joint 43.

[0033] The bending measurement assembly 6 includes a fixed box 61, a flipping box 62, a flipping rod 63, a driving rod 64, a plurality of pulley groups 65, a driving motor 66, and two infrared ranging modules 67. Among them, the fixed box 61 is arranged on the limit seat 46. One end of the flipping box 62 is fixed on the flipping rod 63. The driving rod 64 is arranged corresponding to the flipping rod 63. The flipping rod 63 and the driving rod 64 are rotatably arranged on the limit seat 46. The driving motor 66 is arranged corresponding to the driving rod 64. The pulley groups 65 are arranged on the flipping rod 63, the driving rod 64, and the driving motor 66. The infrared ranging modules 67 are arranged on the opposite surfaces of the fixed box 61 and the flipping box 62.

[0034] It should be further noted that: When the fixed box 61 and the flipping box 62 are attached to each other, they form a hollow cube structure. The infrared ranging module 67 includes a transmitting unit and a receiving unit. The two transmitting units are arranged on two adjacent surfaces near the hollow position of the cube, and the two receiving units are arranged on the other two surfaces. The infrared ranging module 67 is used to detect whether there is a local bending situation before and after the driving of the pull rod 42.

[0035] In actual operation, when the tipping mechanism 4 starts to act, the driving motor 66 is started, and the flipping rod 63 is driven to rotate through the pulley groups 65 and the driving rod 64, thereby driving the flipping box 62 to rotate and open. When the tipping mechanism 4 resets, the driving motor 66 drives the flipping box 62 to rotate and close again.

[0036] The oil liquid collection box 7 includes a box body 71, a pressure detection module, several springs 72, and a sliding box 73. Among them, the pressure detection module is arranged at the bottom of the box body 71. The springs 72 connect the pressure detection module and the bottom of the sliding box 73. The sliding box 73 is slidably matched with the box body 71.

[0037] It should be noted that: the oil collecting box 7 is used to collect the oil dripping from the end of the upper roller mechanism 3 above, and the change of the pressure signal detected by the pressure detection module is used to judge whether there is oil dripping and the amount of oil dripping.

[0038] A supporting roller assembly 8 is arranged on the lower side of the lower roller mechanism 2 to provide additional supporting force for the lower roller mechanism 2.

[0039] A calibration assembly 9 is arranged on the discharging side of the base 1 to correct the feeding direction of the material.

[0040] The specific implementation method is as follows:

[0041] ① Working method of the oil cleaning assembly 5: After the plate rolling machine finishes processing, the tipping mechanism 4 is started, the joint 43 pulls the pin shaft 44 to drive the bearing cover at the end of the upper roller mechanism 3 to move outward. During this period, relative rotation occurs between the liquid storage box 52 and the switch box 53. The slider 532 slides upward, causing the bottom opening of the switch groove 523, and the cleaning liquid inside flows out and is absorbed by the cleaning cotton block 533. The liquid level monitoring module in the annular cavity 522 is used to detect whether the cleaning liquid flows out normally. After the material taking is completed, the tipping mechanism 4 resets. During this period, the slider 532 moves downward to re-seal the bottom opening of the switch groove 523. At the same time, the cleaning cotton block 533 cleans the pin shaft 44, the inside of the switch box 53, and the surface of the liquid storage box 52 under rotational extrusion, blocking the oil and gas and dust impurities infiltrated by cleaning. After resetting, the infusion box 51 replenishes the cleaning liquid into the annular cavity 522.

[0042] ② Working method of the bending measurement assembly 6: Before the tipping mechanism 4 works, the two infrared distance measurement modules 67 detect the distance to the pull rod 42 to establish a spatial coordinate system and lock the local position of the pull rod 42. After the tipping mechanism 4 works, the infrared distance measurement module 67 detects the position of the pull rod 42 again and compares it with the previous set of data to judge whether the pull rod 42 is reset. If it is not reset, it is judged whether the pull rod 42 has an overall offset or a local bending offset from the original position, and the result is fed back for timely processing.

[0043] ③ Working method of the oil collecting box 7: The oil collecting box 7 is used to detect whether there is oil leaking from the end of the upper roller mechanism 3 during the operation of the plate rolling machine (sheet metal processing and flipping the cover). By collecting the leaked oil and detecting the total amount of leaked oil, the bearing oil leakage situation can be judged. That is, if the pressure detection module of the oil collecting box 7 detects oil dripping, it can be judged that there is oil adhering to the surface of the end of the upper roller mechanism 3 and needs to be cleaned. If a large amount of oil leakage is detected, it can be judged that the bearing is damaged and the internal sealed lubricating oil leaks, and maintenance is required.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, 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 on the present invention.

[0045] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them. Although the present invention 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 described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A protective device for an upper roller universal plate rolling machine, characterized in that: include: A base (1), a lower roller mechanism (2), an upper roller mechanism (3), a tipping mechanism (4) and a protection mechanism, wherein the lower roller mechanism (2) is arranged on the base (1), the upper roller mechanism (3) is mounted on the lower roller mechanism (2), the tipping mechanism (4) comprises a cylinder (41), a pull rod (42), a joint (43), a pin shaft (44), an ear plate (45), a limit seat (46) and a cylinder base (47), wherein the cylinder (41) is arranged on one side of the base (1) through the cylinder base (47), one end of the pull rod (42) is connected to the cylinder (41) and the other end is connected to the joint (43), both ends of the pin shaft (44) are fixed to one side of the upper roller mechanism (3) through the ear plate (45), the joint (43) is passed through the pin shaft (44) and rotatably cooperates therewith, and the limit seat (46) is fixed to one side of the base (1) and arranged relative to the pull rod (42); The protection mechanism comprises an oil cleaning component (5), a bending measuring component (6) and an oil collecting box (7), wherein the oil cleaning component (5) is arranged on the joint (43) and the pin shaft (44) and is used to block and clean the oil stains between the joint (43) and the pin shaft (44); the bending measuring component (6) is arranged on the limit seat (46) and is used to detect the state of the pull rod (42); and the oil collecting box (7) is fixed on the base (1) and arranged relative to the shaft end of the upper roller mechanism (3) and is used to collect oil dripping when the upper roller mechanism (3) is working; The oil cleaning assembly (5) comprises an infusion box (51), two liquid storage boxes (52) and two switch boxes (53), wherein the infusion box (51) is arranged on the upper side of the joint (43), and the switch box (53) is arranged in conjunction with the liquid storage box (52) and fixed on the pin shaft (44); A circular hole (521) for cooperating with the pin shaft (44) is provided in the middle of the liquid storage box (52); an annular cavity (522) for storing cleaning liquid is provided inside the liquid storage box (52); a switch groove (523) is provided on the surface of the annular cavity (522); four arc-shaped grooves (524) are provided on four sides of the liquid storage box (52); and the switch box (53) is a round cover structure; A second circular hole (531) for cooperating with the pin shaft (44) is provided in the middle of the switch box (53); a sliding block (532) for cooperating with the switch groove (523) is provided on the inner wall of the switch box (53); a cleaning cotton block (533) is filled inside the switch box (53); and the outer edge of the switch box (53) is cooperating with the arc groove (524); The bending measuring assembly (6) comprises a fixed box (61), a flip box (62), a flip rod (63), a driving rod (64), a plurality of pulley groups (65), a driving motor (66) and two groups of infrared distance measuring modules (67), wherein the fixed box (61) is arranged on a limit seat (46), one end of the flip box (62) is fixed on the flip rod (63), the driving rod (64) is arranged corresponding to the flip rod (63), the flip rod (63) and the driving rod (64) are rotatably arranged on the limit seat (46), the driving motor (66) is arranged corresponding to the driving rod (64), the pulley group (65) is arranged on the flip rod (63), the driving rod (64) and the driving motor (66), and the infrared distance measuring module (67) is arranged on opposite surfaces of the fixed box (61) and the flip box (62); The fixed box (61) and the flip box (62) form a hollow cubic structure when they are attached together. The infrared distance measuring module (67) comprises a transmitting unit and a receiving unit. Two groups of transmitting units are arranged on two surfaces adjacent to the hollow position of the cube, and two receiving units are arranged on the other two surfaces. The infrared distance measuring module (67) is used to detect whether the pull rod (42) is locally bent before and after being driven. The oil collection box (7) comprises a box body (71), a pressure detection module, a plurality of springs (72) and a sliding box (73), wherein the pressure detection module is arranged at the bottom of the box body (71), the spring (72) connects the pressure detection module and the bottom of the sliding box (73), and the sliding box (73) and the box body (71) are slidably matched.

2. The protective device for the upper roller universal plate rolling machine according to claim 1 is characterized in that: The annular cavity (522) is connected to the liquid storage box (52) via a hose built into the joint (43); the liquid storage box (52) is used to store cleaning liquid and has an output device built into it; the output device is used to input the cleaning liquid inside into the annular cavity (522); a liquid level monitoring module is provided in the annular cavity (522) for monitoring the level of the cleaning liquid; the slider (532) occupies half the size of the switch slot (523).

3. The protective device for the upper roller universal plate rolling machine according to claim 1 is characterized in that: A roller assembly (8) is provided on the lower side of the lower roller mechanism (2) for providing additional supporting force for the lower roller mechanism (2).

4. The protective device for the upper roller universal plate rolling machine according to claim 1 is characterized in that: The base (1) is provided with a correction component (9) on the discharge side thereof, for correcting the material feeding direction.

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