Negative pressure type constant-temperature sheet preheater

Abstract

The invention belongs to the field of sheet processing equipment, and particularly relates to a negative pressure type constant-temperature sheet preheater which comprises a case, a case door is arranged on the front side of the case, a feeding port and a discharging port are formed in the left side and the right side of the case respectively, a heat insulation layer is arranged on the inner wall face of the case, and a square frame is fixedly arranged at the bottom of the case. A stretching assembly used for stretching sheets is arranged in the square frame, a first partition plate is arranged on the upper side of the square frame, and a second partition plate is connected to the bottom of the first partition plate. A plurality of air inlet holes are evenly distributed in the first partition plate, a plurality of first air outlet holes are evenly distributed in the upper side of the second partition plate, a plurality of second air outlet holes are evenly distributed in the lower side of the second partition plate, and the hole diameter of the second air outlet holes is larger than that of the first air outlet holes. And at least one exhaust pump is arranged above the first partition plate. And by means of negative pressure circulation in the working cavity, preheating energy consumption is reduced, hot air gushing in the box door opening process is avoided, and the safety of workers is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of sheet material processing equipment, and in particular relates to a negative pressure constant temperature sheet material preheating machine. Background Art

[0002] Sheet preheating is an essential process in sheet processing. It needs to be stretched after preheating to gradually stretch the originally thick sheet to a sheet that meets the standard thickness. Most of the current sheet preheating equipment is positive pressure equipment. In most cases, hot air is directly supplied to the sheet through the air supply structure behind the stretching drum to preheat the sheet. This method has the following problems: Bringing air toward the sheet at the stretching roller will cause the interior of the machine to be in a state of high heat and positive pressure. When the machine case is opened for operation, the hot air may cause harm to the operator. Positive pressure causes serious hot air leakage, resulting in energy waste.

[0003] Therefore, the present application aims to propose a negative pressure constant temperature sheet preheating machine to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a negative pressure constant temperature sheet preheating machine. The present invention reduces the preheating energy consumption by circulating negative pressure in the working chamber, avoids hot air gushing during the opening of the box door, and ensures the safety of the staff.

[0005] The object of the present invention can be achieved by the following technical solutions: A negative pressure constant temperature sheet preheating machine, comprising a chassis, a chassis door is provided on the front side of the chassis, a feed port and a discharge port are provided on the left and right sides of the chassis respectively, a heat insulation layer is provided on the inner wall of the chassis, a square frame is fixedly provided on the bottom of the chassis, a stretching assembly for stretching the sheet is provided in the square frame, a first partition is provided at the upper side of the square frame, and a second partition is connected to the bottom of the first partition; The first partition plate is provided with a plurality of air inlet holes evenly distributed, the upper portion of the second partition plate is provided with a plurality of first air outlet holes evenly distributed, and the lower portion of the second partition plate is provided with a plurality of second air outlet holes evenly distributed, wherein the aperture of the second air outlet holes is larger than that of the first air outlet holes; At least one exhaust pump is provided above the first partition.

[0006] A feed roller is rotatably arranged below the feed port, and a pressure roller assembly is provided above the feed roller, and the pressure roller assembly can press the pressure roller down to clamp the sheet. A first conveying roller is rotatably arranged on the inner side of the feed port, a second conveying roller is rotatably arranged on the inner side of the discharge port, and a discharge roller is rotatably arranged on the outer side of the discharge port. A pressure roller assembly is also provided above the discharge roller, and a reduction motor is fixedly provided on the rear side wall of the chassis through a mounting plate, and the output end of the reduction motor is fixedly connected to the discharge roller, and a third conveying roller is rotatably provided on the square frame near the discharge port.

[0007] The stretching assembly includes four guide rods fixedly arranged inside a square frame, two movable frames are slidably arranged on the four guide rods, each movable frame is slidably connected to the guide rod through a sliding sleeve, and each movable frame is symmetrically provided with multiple groups of fixed plates on both sides facing the other movable frame, and a stretching roller is rotatably arranged between each group of fixed plates, and the stretching rollers on the upper and lower movable frames are staggered.

[0008] A hydraulic cylinder is provided on the top of the chassis, and the hydraulic cylinder is connected to a multi-stage telescopic rod. The lower end of the multi-stage telescopic rod is fixedly connected to the upper movable frame. The lower part of the two sliding sleeves on the lower movable frame close to the box door side is provided with a limiting sleeve, and the limiting sleeve can fix the lower movable frame on the guide rod.

[0009] A middle baffle is provided on the first partition, and the air inlet holes are distributed on the side of the first partition located on the middle baffle close to the box door. An exhaust cavity is formed between the second baffle and the insulation layer of the chassis. Two exhaust shells are fixedly provided on the side of the middle baffle away from the exhaust cavity. A through opening is provided at the connection between the middle baffle and the exhaust shell. The exhaust pump is arranged inside the exhaust shell. A drive motor is fixedly provided on the top of the chassis at a position above each exhaust pump. The drive motor is connected to the corresponding exhaust pump for transmission. A motor frame for fixing the drive motor is also provided on the top of the chassis. An air outlet pipe is provided on the side of the exhaust pump close to the through opening, and the air outlet pipe opens toward the exhaust cavity.

[0010] The air intake of the exhaust pump is arranged toward the first partition plate, and an electric heating plate is arranged between the air intake of each exhaust pump and the first partition plate.

[0011] The upper end of the movable frame located on the upper side is fixedly connected to a wind block plate through two fixing rods. A section of the wind block plate close to the second partition extends beyond the square frame. Two sleeves are fixed on the wind block plate. The sleeves are fixedly connected to the sliding sleeves on the movable frame on the upper side. The sleeves are slidably connected to the guide rods. A through hole is opened on the wind block plate for the rod body of the square frame to move through.

[0012] A plurality of tracks are provided on the insulation layer of the left and right side walls of the chassis, a plurality of slots are opened on the second partition, the second partition is slidably set on the tracks through the plurality of slots, and support angle plates are fixed on both sides of the rear side of the second partition respectively, a spring base is fixed on the rear side of each of the tracks, and a plurality of springs are connected between the spring base and the support angle plate.

[0013] A temperature sensor is provided inside the chassis, and a control panel is also provided on the chassis.

[0014] Compared with the prior art, the present invention has the following advantages: The negative pressure internal circulation heating method is adopted to avoid energy waste, and the internal temperature control is more precise and the temperature fluctuation range is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the present invention; Figure 2 This is the main view of the present invention; Figure 3 A top view of the present invention; Figure 4 for Figure 3 Cross-sectional view at AA in the middle; Figure 5 for Figure 3 Cross-sectional view at the middle BB; Figure 6 for Figure 5 A partial enlarged view of point C in the middle; Figure 7 This is a schematic diagram of the internal structure above the first partition of the present invention; Figure 8 for Figure 6 Isometric solid drawing of the structure shown.

[0016] In the figure: chassis 1, drive motor 2, box door 3, control panel 4, hydraulic cylinder 5, discharging roller 6, reduction motor 7, pressure roller assembly 8, motor frame 9, mounting plate 10, multi-stage telescopic rod 11, square frame 12, movable frame 13, wind block plate 14, first conveyor roller 15, second conveyor roller 16, temperature sensor 17, fixing rod 18, fixing plate 19, stretching roller 20, second partition plate 21, first air outlet 22, second air outlet 23, sliding sleeve 24, limiting sleeve 25, thermal insulation layer 26, guide rod 27, sleeve 28, first partition plate 29, notch 30, exhaust chamber 31, track 32, spring base 33, exhaust housing 36, exhaust pump 37, air outlet pipe 38, through port 39, air inlet 40, middle baffle 41, electric heating plate 42, third conveyor roller 43. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] It should be noted that the directional words such as "shang" and "xia" in this article are based on Figures 1 to 8 The positions of the components in the figure and the relative positions of the components are defined only for the clarity and convenience of expressing the technical solution. It should be understood that the directional terms used herein should not limit the scope of protection claimed in this application.

[0019] A negative pressure constant temperature sheet preheating machine includes a chassis 1, a chassis door 3 is provided on the front side of the chassis 1, a feed port and a discharge port are provided on the left and right sides of the chassis 1, an insulation layer 26 is provided on the inner wall of the chassis 1, a square frame 12 is fixedly provided on the bottom of the chassis 1, a stretching assembly for stretching the sheet is provided in the square frame 12, a first partition 29 is provided at the upper side of the square frame 12, and a second partition 21 is connected to the bottom of the first partition 29; A plurality of air inlet holes 40 are evenly distributed on the first partition plate 29, a plurality of first air outlet holes 22 are evenly distributed on the upper side of the second partition plate 21, and a plurality of second air outlet holes 23 are evenly distributed on the lower side of the second partition plate 21. The aperture of the second air outlet holes 23 is larger than that of the first air outlet holes 22. At least one exhaust pump 37 is provided above the first partition plate 29 .

[0020] The second partition 21 is provided with a perforation on the bottom and a small hole on the top so that when negative pressure is generated by suction through the air inlet hole 40 inside, the gas can enter the working chamber formed by the chassis 1, the first partition 29 and the second partition 21 more evenly from the upper and lower positions of the second partition 21, thereby avoiding the gas being extracted only from the holes on the upper side of the second partition 21, causing uneven temperature distribution in the working chamber.

[0021] A feed roller is rotatably provided below the feed port, and a pressure roller assembly 8 is provided above the feed roller. The pressure roller assembly 8 can press the pressure roller down to clamp the sheet. A first conveying roller 15 is rotatably provided inside the feed port, a second conveying roller 16 is rotatably provided inside the discharge port, and a discharge roller 6 is rotatably provided outside the discharge port. A pressure roller assembly 8 is also provided above the discharge roller 6. A reduction motor 7 is fixedly provided on the rear wall of the chassis 1 through a mounting plate 10. The output end of the reduction motor 7 is fixedly connected to the discharge roller 6. A third conveying roller 43 is rotatably provided on the square frame 12 near the discharge port. The pressure roller assembly 8 is a pressure roller structure that can actively move up and down, and can press the pressure roller down to cooperate with the feed roller / discharge roller to clamp the sheet. It belongs to the existing technology and will not be described in detail here.

[0022] The stretching assembly includes four guide rods 27 fixedly arranged inside the square frame 12, and two movable frames 13 are slidably arranged on the four guide rods 27. Each movable frame 13 is slidably connected to the guide rod 27 through a sliding sleeve 24. Each movable frame 13 has multiple groups of fixed plates 19 symmetrically arranged on both sides facing the other movable frame 13. A stretching roller 20 is rotatably arranged between each group of fixed plates 19, and the stretching rollers 20 on the upper and lower movable frames 13 are arranged in an alternating manner.

[0023] A hydraulic cylinder 5 is provided on the top of the chassis 1. The hydraulic cylinder 5 is connected to a multi-stage telescopic rod 11. The lower end of the multi-stage telescopic rod 11 is fixedly connected to the upper movable frame 13. A limiting sleeve 25 is provided below the two sliding sleeves 24 on the lower movable frame 13 near the cabinet door 3. The limiting sleeve 25 can fix the lower movable frame 13 to the guide rod 27. The limiting sleeve 25 can clamp or loosen the connection with the guide rod 27 to adjust the position of the lower movable frame on the guide rod 27. This belongs to the prior art and will not be described in detail here.

[0024] A middle baffle 41 is provided on the first partition 29, and the air inlet holes 40 are distributed on the side of the first partition 29 located on the middle baffle 41 close to the box door 3. An exhaust chamber 31 is formed between the second partition 21 and the insulation layer 26 of the chassis 1. Two exhaust shells 36 are fixedly provided on the side of the middle baffle 41 away from the exhaust chamber 31. A through opening 39 is opened at the connection between the middle baffle 41 and the exhaust shell 36. The exhaust pump 37 is arranged inside the exhaust shell 36. A drive motor 2 is fixedly provided at the top of the chassis 1 above each exhaust pump 37. The drive motor 2 is connected to the corresponding exhaust pump 37 for transmission. A motor frame 9 for fixing the drive motor 2 is also provided on the top of the chassis 1. An air outlet pipe 38 is provided on the side of the exhaust pump 37 close to the through opening 39, and the air outlet pipe 38 opens toward the exhaust chamber 31.

[0025] The air intake of the exhaust pump 37 is arranged toward the first partition plate 29 , and an electric heating plate 42 is arranged between the air intake of each exhaust pump 37 and the first partition plate 29 .

[0026] The upper end of the movable frame 13 located on the upper side is fixedly connected to the wind block plate 14 through two fixing rods 18. A section of the wind block plate 14 close to the second partition 21 extends beyond the square frame 12. Two sleeves 28 are fixed on the wind block plate 14. The sleeves 28 are fixedly connected to the sliding sleeves 24 on the movable frame 13 on the upper side. The sleeves 28 are slidably connected to the guide rods 27. A through hole is opened on the wind block plate 14 for the rod body of the square frame 12 to move through.

[0027] A plurality of tracks 32 are provided on the insulation layer 26 of the left and right side walls of the chassis 1, a plurality of slots 30 are opened on the second partition 21, and the second partition 21 is slidably set on the track 32 through the plurality of slots 30. Support angle plates 35 are fixed on both sides of the rear side of the second partition 21, and a spring base 33 is fixed on the rear side of each track 32. A plurality of springs 34 are connected between the spring base 33 and the support angle plate 35.

[0028] A temperature sensor 17 is provided inside the chassis 1 , and a control panel 4 is also provided on the chassis 1 .

[0029] When preheating the sheet, open the box door 3, lift the pressure roller assembly 8 at the feed port and the discharge port, control the hydraulic cylinder 5 to lower the upper movable frame 13 until the stretching roller 20 on the upper movable frame 13 is staggered with the stretching roller 20 on the lower movable frame 13, feed the sheet from the feed port, pass through the first conveyor roller 15, and then pass downward between the stretching rollers 20, and then pass upward through the third conveyor roller 43 and extend out of the discharge port, and then close the box door 3.

[0030] Start the drive motor 2, drive the exhaust pump 37 to start, and turn on the two electric heating plates 42 at the same time. The gas inside the chassis 1 is sucked in from the air inlet 40 of the first partition 29, heated by the electric heating plate 42, and then enters the exhaust pump 37, and is then discharged from the air outlet pipe 38 into the exhaust chamber 31. Since the air inlet 40 is in the state of sucking air from the working chamber, negative pressure is generated in the working chamber. Driven by the air pressure, the second partition 21 is driven to slide toward the wind blocking plate 14, stretching the spring 34, and the temperature in the working chamber of the chassis 1 is monitored in real time through the temperature sensor 17.

[0031] After reaching the required temperature, the two pressure roller assemblies 8 are controlled to press the rollers down to clamp the sheet, and the reduction motor 7 is started to drive the discharge roller 6 to rotate, thereby driving the sheet to be transported. At the same time, the hydraulic cylinder 5 is controlled to retract the multi-stage telescopic rod 11 upward, driving the upper movable frame 13 to move upward, and the sheet is stretched by the stretching roller 20 to increase the contact area with the hot air. As the sheet is transported, the hot air is extracted from the second partition 21 and enters the working chamber. Due to the presence of the wind block plate 14, the gas is extracted and first moves along the sheet toward the door 3, then moves upward through the gap between the door 3 and the wind block plate 14 and enters the upper layer of the wind block plate 14. Finally, it is extracted from the air intake hole 40 and reheated by the electric heating plate 42 to perform a cycle.

[0032] The second baffle 21 is driven by suction to press against the air blocker, preventing air from being directly drawn from the side to the air intake 40. This ensures that the air circulates along the sheet, improves the sheet preheating efficiency, and avoids uneven temperature distribution within the chassis 1. Conventional sheet preheating cabinets all have positive pressure inside the cabinet, resulting in a surge of hot air when the cabinet door is opened. Furthermore, positive pressure equipment suffers from serious internal air leakage, resulting in energy waste. In this application, negative pressure is employed, and when the cabinet door 3 is opened, air is drawn from the cabinet door 3. The second baffle 21 quickly rebounds under the action of the spring 34, further increasing the working chamber space and ensuring a negative pressure inside the working chamber under normal operating conditions. When the cabinet door 3 is opened, the volume of the working chamber increases, creating a state in which external air is drawn inward, preventing hot air from escaping and ensuring operator safety. Furthermore, after the cabinet door is opened, the air blocker 14 separates from the second baffle 21, and air is preferentially drawn upward from the opening between the second baffle 21 and the air blocker 14, preventing hot air from blowing directly outward when the door is open.

[0033] Specifically, in this embodiment, the temperature inside the chassis 1 is adjusted by negative pressure circulation, which has high adjustment efficiency, lower energy consumption, higher safety guarantee for operators, and small temperature fluctuations during the internal circulation process, which can be controlled within the range of ±2°C.

[0034] The above is only a preferred embodiment of the present application. Although the present application has been disclosed as a preferred embodiment, it is not intended to limit the present application. Any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of protection of the technical solution of the present application.

Claims

1. A negative pressure constant temperature sheet material preheating machine, comprising a machine box (1), wherein a machine box door (3) is provided on the front side of the machine box (1), It is characterized in that The left and right sides of the chassis (1) are respectively provided with a feed port and a discharge port; the inner wall surface of the chassis (1) is provided with a heat insulation layer (26); a square frame (12) is fixedly provided at the bottom of the chassis (1); a stretching assembly for stretching the sheet is provided in the square frame (12); a first partition (29) is provided at the upper side of the square frame (12); and a second partition (21) is connected to the bottom of the first partition (29); A plurality of air inlet holes (40) are evenly distributed on the first partition plate (29), a plurality of first air outlet holes (22) are evenly distributed on the upper side of the second partition plate (21), and a plurality of second air outlet holes (23) are evenly distributed on the lower side of the second partition plate (21), wherein the aperture of the second air outlet hole (23) is larger than that of the first air outlet hole (22); At least one exhaust pump (37) is provided above the first partition plate (29).

2. A negative pressure constant temperature sheet preheating machine according to claim 1, It is characterized in that A feed roller is rotatably arranged below the feed port, a pressure roller assembly (8) is arranged above the feed roller, and the pressure roller assembly (8) can press the pressure roller down to clamp the sheet material. A first conveying roller (15) is rotatably arranged inside the feed port, a second conveying roller (16) is rotatably arranged inside the discharge port, a discharge roller (6) is rotatably arranged outside the discharge port, and a pressure roller assembly (8) is also arranged above the discharge roller (6). A reduction motor (7) is fixedly arranged on the rear wall of the chassis (1) via a mounting plate (10), and the output end of the reduction motor (7) is fixedly connected to the discharge roller (6). A third conveying roller (43) is rotatably arranged on the square frame (12) near the discharge port.

3. A negative pressure constant temperature sheet preheating machine according to claim 1, It is characterized in that The stretching assembly comprises four guide rods (27) fixedly arranged inside a square frame (12); two moving frames (13) are slidably arranged on the four guide rods (27); each moving frame (13) is slidably connected to the guide rod (27) via a sliding sleeve (24); a plurality of groups of fixed plates (19) are symmetrically arranged on both sides of each moving frame (13) facing one side of another moving frame (13); a stretching roller (20) is rotatably arranged between each group of fixed plates (19); and the stretching rollers (20) on the upper and lower moving frames (13) are arranged in a staggered distribution.

4. A negative pressure constant temperature sheet preheating machine according to claim 3, It is characterized in that A hydraulic cylinder (5) is provided on the top of the chassis (1), the hydraulic cylinder (5) is connected to a multi-stage telescopic rod (11), the lower end of the multi-stage telescopic rod (11) is fixedly connected to the upper moving frame (13), and a limiting sleeve (25) is provided at the lower part of two sliding sleeves (24) on the lower moving frame (13) close to the cabinet door (3), and the limiting sleeve (25) can fix the lower moving frame (13) on the guide rod (27).

5. A negative pressure constant temperature sheet preheating machine according to claim 1, It is characterized in that A middle baffle (41) is provided on the first baffle (29); the air inlet holes (40) are distributed on a side of the first baffle (29) located on the middle baffle (41) close to the box door (3); an exhaust cavity (31) is formed between the second baffle (21) and the heat insulation layer (26) of the box (1); two exhaust shells (36) are fixedly provided on a side of the middle baffle (41) away from the exhaust cavity (31); a through opening (39) is provided at the connection between the middle baffle (41) and the exhaust shell (36) The exhaust pump (37) is arranged inside the exhaust housing (36); a drive motor (2) is fixedly provided on the top of the chassis (1) at a position above each exhaust pump (37); the drive motor (2) is connected to the corresponding exhaust pump (37) for transmission; a motor frame (9) for fixing the drive motor (2) is also provided on the top of the chassis (1); an air outlet pipe (38) is provided on one side of the exhaust pump (37) close to the opening (39); the air outlet pipe (38) opens toward the exhaust chamber (31).

6. A negative pressure constant temperature sheet preheating machine according to claim 5, It is characterized in that The air intake port of the exhaust pump (37) is arranged toward the first partition plate (29), and an electric heating plate (42) is arranged between the air intake port of each exhaust pump (37) and the first partition plate (29).

7. A negative pressure constant temperature sheet preheating machine according to claim 3, It is characterized in that The upper end of the movable frame (13) located on the upper side is fixedly connected to a wind blocking plate (14) via two fixing rods (18); a section of the wind blocking plate (14) close to the second partition plate (21) extends beyond the square frame (12); two sleeves (28) are fixedly provided on the wind blocking plate (14); the sleeves (28) are fixedly connected to the sliding sleeves (24) on the movable frame (13) on the upper side; the sleeves (28) are slidably connected to the guide rods (27); and a through hole is provided on the wind blocking plate (14) for the rod body of the square frame (12) to move through.

8. The negative pressure constant temperature sheet preheating machine according to claim 1, It is characterized in that A plurality of tracks (32) are provided on the heat insulation layer (26) of the left and right side walls of the chassis (1); a plurality of slots (30) are provided on the second partition (21); the second partition (21) is slidably arranged on the tracks (32) through the plurality of slots (30); support angle plates (35) are fixedly provided on both sides of the rear side of the second partition (21); a spring base (33) is fixedly provided on the rear side of each of the tracks (32); and a plurality of springs (34) are connected between the spring base (33) and the support angle plate (35).

9. The negative pressure constant temperature sheet preheating machine according to claim 1, It is characterized in that A temperature sensor (17) is provided inside the chassis (1), and a control panel (4) is also provided on the chassis (1).

Images