Flame retardant density board and preparation process thereof

Abstract

The invention discloses a flame retardant density board and its preparation process, which belongs to the technical field of density board production and processing. The flame retardant density board and its preparation process include weighing each weight portion of raw materials according to the following formula: 70-85 parts of wood fiber, 8-15 parts of urea-formaldehyde resin, and 3-10 parts of aluminum hydroxide. The specific preparation process is as follows: Step 1: Put wood fiber, urea-formaldehyde resin and aluminum hydroxide into a mixer in a ratio of 8:1:1 and stir at a speed of 40r / min for 20min; Step 2: Evenly lay the stirred raw materials in the lower mold of a hot press with a thickness of 10cm. The present invention arranges a movable lower mold on a workbench, arranges a loading and unloading mechanism on one side of the workbench, and drives the movable lower mold to move to a locking seat through the loading and unloading mechanism, thereby facilitating material laying and unloading, so that the operator does not need to enter under the movable crossbeam of the hot press, greatly reducing the potential safety hazard, and at the same time, the activity space around the locking seat is large, which is convenient for the staff to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of density board production and processing, and specifically relates to a flame retardant density board and a preparation process thereof. Background Art

[0002] Flame retardant density board (also known as flame retardant medium density fiberboard, MDF) is a density board that improves its fire resistance by adding flame retardants. It is usually made of raw materials such as wood fiber, adhesives and flame retardants through high temperature and high pressure processing. It is widely used in construction, furniture manufacturing, decorative materials and other fields, especially in places where fire safety is required, such as commercial buildings, schools and hospitals.

[0003] During the production process of flame-retardant density board, wood fiber, adhesive and flame retardant need to be mixed evenly in a certain proportion. The purpose of mixing is to ensure that the flame retardant can be evenly distributed throughout the board, and then the material is pressed into a board under high temperature and high pressure. This process can solidify the adhesive and make the bond between the wood fibers tighter. During the hot pressing process, workers need to enter between the moving parts of the hot press to lay and unload materials, which poses a great safety hazard in production. At the same time, the small space between the moving parts of the hot press is not conducive to operation and is prone to collision injuries. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a flame retardant density board and a preparation process thereof.

[0005] The technical solution adopted to solve the above technical problems is: a preparation process of a flame retardant density board, comprising weighing the following raw materials by weight: 70-85 parts of wood fiber, 8-15 parts of urea-formaldehyde resin, and 3-10 parts of aluminum hydroxide. The specific preparation process is as follows:

[0006] Step 1: Put wood fiber, urea-formaldehyde resin and aluminum hydroxide into a mixer at a ratio of 8:1:1, and stir at a speed of 40r / min for 20min;

[0007] Step 2: Spread the mixed raw materials evenly in the lower mold of the hot press with a thickness of 10 cm;

[0008] Step 3: Use a hot press to heat press the raw materials into a density board;

[0009] Step 4: Take out the density board and polish it with a grinder;

[0010] Step 5: Cut the polished density board into a predetermined size, and then evenly spray water-based polyurethane coating on the surface of the density board;

[0011] The hot press comprises a workbench, a movable lower mold is fixedly connected to the upper surface of the workbench, a plurality of columns are fixedly connected to the upper surface of the workbench, an end of the column away from the workbench is fixedly connected to an upper crossbeam, a hydraulic rod is fixedly connected to the lower end of the upper crossbeam, a movable crossbeam is fixedly connected to the lower end of the hydraulic rod, safety protection mechanisms are arranged on both sides of the movable crossbeam, a locking seat is arranged on one side of the workbench, and a loading and unloading mechanism is slidably connected to the upper surface of the locking seat.

[0012] Through the above technical solution, during the production of flame-retardant density boards, operators do not need to enter under the movable crossbeam of the hot press, which greatly reduces safety hazards. At the same time, the activity space around the locking seat is large, which is convenient for operators to operate.

[0013] Furthermore, the movable crossbeam includes a movable seat passing through the sliding connection column, the lower surface of the movable seat is fixedly connected to a plurality of first fixing clamps, the first fixing clamps are fixedly connected to a first fixing plate, the lower surface of the first fixing plate is fixedly connected to an upper punch, and the lower surface of the first fixing plate is fixedly connected to a plurality of positioning sleeves.

[0014] Through the above technical solution, the upper punch and the lower die can be accurately molded together by using the positioning sleeve in conjunction with the conical head.

[0015] Furthermore, the safety protection mechanism includes fixing bolts fixedly connected to both sides of the movable seat, the fixing bolts are provided with fixing grooves, nuts are threadedly connected to the fixing bolts, a control steel rope is fixedly connected in the fixing grooves, pulleys are rotatably connected to both sides of the upper cross beam, the control steel rope is sleeved outside the pulley, and the end of the control steel rope away from the fixing bolts is fixedly connected to a protective fence.

[0016] Through the above technical solution, when the movable crossbeam is pressed down, the control steel rope fixed on the fixed bolt pulls the protective fence upward, which can effectively prevent workers from entering the dangerous area during the hot pressing operation. At the same time, when the movable crossbeam completes the hot pressing and moves upward, the protective fence drops, which facilitates the movement of the movable lower mold to discharge the material.

[0017] Furthermore, the movable lower mold includes a pair of fixed rails fixedly connected to the upper surface of the workbench, the pair of fixed rails are slidably connected with movable slide rails, a movable plate is slidably connected between the movable slide rails, a plurality of second fixed clamps are fixedly connected to the movable plate, a second fixed clamp is fixedly connected to the second fixed plate, a plurality of guide columns are fixedly connected to the upper surface of the second fixed plate, a conical head is slidably connected through the guide column, a first spring is fixedly connected to the lower end of the conical head, a lower die is fixedly connected to the upper surface of the second fixed plate, the conical head and the positioning sleeve correspond one to one, and a baffle is fixedly connected to the end of the fixed rail away from the locking seat.

[0018] Through the above technical scheme, the movement of the movable plate can be limited by the movable slide rail, so that the movable plate can be moved to the support frame. Through the setting of the guide column, when the upper punch is pressed down, the positioning sleeve is sleeved outside the conical head, and the positioning sleeve is driven to be fine-tuned through the shape of the conical head, so that the upper punch and the lower die can be accurately molded.

[0019] Furthermore, an outer slide rail is provided on the outer side of the movable slide rail, and the outer slide rail is slidably matched with the fixed rail. A fixed plug is fixedly connected to one end of the movable slide rail close to the locking seat. An inner slide rail is provided on the inner side of the movable slide rail, and a square groove is provided on the movable slide rail, and the inner slide rail is slidably matched with the movable plate.

[0020] Through the above technical scheme, through the coordinated use of the movable slide rail and the wedge block, when the movable plate moves outward, the movable slide rail is driven to move together, so that the plug on the movable slide rail is inserted into the slot of the locking seat, so that the inner slide rail is connected with the guide groove, ensuring that the movable plate can enter the guide groove, avoiding the movable plate from falling or getting stuck due to lack of support during movement, and when the movable plate is reset, the wedge block can drive the movable slide rail to reset, avoiding interference with the lifting and lowering of the protective fence.

[0021] Furthermore, a plurality of rollers are rotatably connected on both sides of the movable plate, a first groove is opened on both sides of the movable plate, a wedge block is rotatably connected in the first groove, a rubber wheel is rotatably connected on the wedge block, a second spring is fixedly connected between the wedge block and the movable plate, a cylinder is fixedly connected at one end of the movable plate close to the locking seat, a guide head is fixedly connected at one end of the cylinder away from the movable plate, a movable ring is slidably connected to the cylinder, a limiting ring is fixedly sleeved on the cylinder, and the wedge block and the square groove are engaged with each other.

[0022] Through the above technical scheme, during the return process of the movable plate, the wedge block is pushed into the square groove by the second spring, thereby driving the movable slide rail to disengage from the locking position of the steel ball. When the movable plate is restored to its position, the pull rod drives the locking sleeve to continue to move forward, so that the wedge-shaped pin pushes the movable ring to move, and the movable ring is blocked by the limit ring, so that the wedge-shaped pin is pushed into the wall of the locking sleeve, so that the wedge-shaped pin moves between the movable ring and the movable plate. Then the motor reverses and drives the locking sleeve to move outward through the pull rod, and the movable ring is pulled to the guide head, so that the movable ring is close to the guide head, so that the wedge-shaped pin cannot be inserted between the movable ring and the guide head, thereby causing the locking sleeve to detach from the guide head.

[0023] Furthermore, the locking seat includes a support frame, a pair of guide grooves are opened on the inner side of the support frame, a pair of slots are opened on the end of the support frame close to the workbench, second grooves are opened on the upper and lower sides of the slots, a third spring is fixedly connected in the second groove, a steel ball is fixedly connected to the third spring, and racks are fixedly connected on both sides of the upper surface of the support frame.

[0024] Through the above technical solution, the fixed plug on the movable slide rail can be inserted into the slot, and the third spring can push the steel ball into the groove on the fixed plug to lock it, so that the inner slide rail is aligned with the guide groove, making it convenient for the movable plate to enter the guide groove.

[0025] Furthermore, the loading and unloading mechanism includes a movable base slidably connected in the guide groove, and motors are fixedly connected on both sides of the upper surface of the movable base, and a gear is fixedly connected to the output end of the motor, and the gear and the rack are meshed with each other. A pull rod is fixedly connected to the end of the movable base close to the workbench, and a locking sleeve is fixedly connected to the end of the pull rod away from the movable base. Wedge-shaped pins are slidably connected on both sides of the locking sleeve, and a fourth spring is fixedly connected to the wedge-shaped pin, and the fourth spring is fixedly connected to the locking sleeve.

[0026] Through the above technical solution, the motor drives the gear to rotate, and the gear cooperates with the rack to move the movable base toward the workbench, and then the guide head is inserted into the locking sleeve. At this time, the guide head pushes away the wedge-shaped bayonet, so that the wedge-shaped bayonet enters between the guide head and the movable ring under the push of the fourth spring, and the guide head is clamped by the wedge-shaped bayonet, and then the motor reverses to drive the movable base to move outward, so that the movable plate is pulled out.

[0027] The beneficial effects of the present invention are as follows: (1) The present invention arranges a movable lower mold on the workbench, and arranges a loading and unloading mechanism on one side of the workbench, and drives the movable lower mold to move to the locking seat through the loading and unloading mechanism, so as to facilitate material laying and unloading, and eliminates the need for operators to enter under the movable crossbeam of the hot press, which greatly reduces safety hazards. At the same time, the activity space around the locking seat is large, which is convenient for operators to operate; (2) The present invention uses a safety protection mechanism. When the movable crossbeam is pressed down, the control steel rope fixed on the fixing bolt pulls the protection fence upward, which can effectively avoid the occurrence of accidents during the hot press operation. When the worker enters the danger zone during operation, the protective fence drops when the movable crossbeam completes the hot pressing and moves upward, making it convenient for the movable lower mold to move and discharge the material; (3) The present invention uses a movable slide rail in conjunction with a wedge block. When the movable plate moves outward, the movable slide rail is driven to move together, so that the plug on the movable slide rail is inserted into the slot of the locking seat, thereby connecting the inner slide rail with the guide groove, ensuring that the movable plate can enter the guide groove, avoiding the movable plate from falling or getting stuck due to lack of support during movement, and when the movable plate is reset, the wedge block can drive the movable slide rail to reset, avoiding interference with the lifting and lowering of the protective fence. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the overall structure diagram of the compression molding machine of the present invention;

[0029] Figure 2 It is a top view of the structure of the compression molding machine of the present invention;

[0030] Figure 3 It is a structural diagram of the upper mold of the present invention;

[0031] Figure 4 It is a structural diagram of the safety protection mechanism of the present invention;

[0032] Figure 5 yes Figure 4 A magnified image of point A;

[0033] Figure 6 It is a structural diagram of the lower mold of the present invention;

[0034] Figure 7 yes Figure 6 The enlarged view of point B;

[0035] Figure 8 is an exploded view of the lower mold of the present invention;

[0036] Fig. 9 It is a structural diagram of the movable slide rail of the present invention;

[0037] Fig.10 is a three-dimensional diagram of the lower mold of the present invention;

[0038] Fig.11 is a cross-sectional view of the lower mold of the present invention;

[0039] Fig.12 yes Fig.11 Enlarged view of point C;

[0040] Fig.13 yes Fig.11 The enlarged view of point D;

[0041] Fig.14 It is a structural diagram of the loading and unloading mechanism of the present invention;

[0042] Fig.15 yes Fig.14 The enlarged view of point E;

[0043] Fig.16 It is a diagram of the internal structure of the sleeve of the present invention.

[0044] Figure numerals: 1, workbench; 2, column; 3, upper crossbeam; 4, hydraulic rod; 5, safety protection mechanism; 51, fixing bolt; 52, fixing groove; 53, nut; 54, control steel rope; 55, pulley; 56, protection fence; 6, movable crossbeam; 61, movable seat; 62, first fixing fixture; 63, first fixing plate; 64, positioning sleeve; 65, upper punch; 7, movable lower mold; 71, fixed rail; 72, movable slide rail; 73, movable plate; 74, second fixing fixture; 75, second fixing plate; 76, lower concave mold; 77, guide column; 78, first spring; 79, cone head; 710, inner Slide rail; 711, square groove; 712, fixed plug; 713, outer slide rail; 714, roller; 715, first groove; 716, wedge block; 717, rubber wheel; 718, second spring; 719, cylinder; 720, guide head; 721, movable ring; 722, limit ring; 8, locking seat; 81, support frame; 82, slot; 83, second groove; 84, third spring; 85, steel ball; 86, guide groove; 87, rack; 9, loading and unloading mechanism; 91, movable base; 92, motor; 93, gear; 94, pull rod; 95, locking sleeve; 96, fourth spring; 97, wedge pin. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] like Figure 1-Figure 16 As shown, a flame retardant density board and its preparation process of this embodiment include weighing the raw materials in parts by weight according to the following formula: 70-85 parts of wood fiber, 8-15 parts of urea-formaldehyde resin, and 3-10 parts of aluminum hydroxide. The specific preparation process is as follows:

[0047] Step 1: Put wood fiber, urea-formaldehyde resin and aluminum hydroxide into a mixer at a ratio of 8:1:1, and stir at a speed of 40r / min for 20min;

[0048] Step 2: Spread the mixed raw materials evenly in the lower mold of the hot press with a thickness of 10 cm;

[0049] Step 3: Use a hot press to heat press the raw materials into a density board;

[0050] Step 4: Take out the density board and polish it with a grinder;

[0051] Step 5: Cut the polished density board into a predetermined size, and then evenly spray water-based polyurethane coating on the surface of the density board;

[0052] The hot press includes a workbench 1, and a plurality of columns 2 are fixedly connected to the upper surface of the workbench 1. An upper crossbeam 3 is fixedly connected to one end of the column 2 away from the workbench 1. A hydraulic rod 4 is fixedly connected to the lower end of the upper crossbeam 3. The hydraulic rod 4 then pushes a movable crossbeam 6 downward to perform hot pressing operations. The movable crossbeam 6 can be limited by the columns 2.

[0053] like Figure 6-Figure 13 As shown, a movable lower mold 7 is fixedly connected to the upper surface of the workbench 1, and the movable lower mold 7 includes a pair of fixed rails 71 fixedly connected to the upper surface of the workbench 1, and movable slide rails 72 are slidably connected in the pair of fixed rails 71, and a movable plate 73 is slidably connected between the movable slide rails 72, and a plurality of second fixed clamps 74 are fixedly connected to the movable plate 73, and a second fixed plate 75 is fixedly connected to the second fixed clamps 74, and a plurality of guide columns 77 are fixedly connected to the upper surface of the second fixed plate 75, and a conical head 79 is slidably connected through the guide column 77, and a first spring 78 is fixedly connected to the lower end of the conical head 79, and a lower concave mold 76 is fixedly connected to the upper surface of the second fixed plate 75, and the conical head 79 corresponds to the positioning sleeve 64 one by one, and a baffle is fixedly connected to the end of the fixed rail 71 away from the locking seat 8, and the conical head 79 is inserted into the positioning sleeve 64 for positioning and adjustment to ensure that the upper punch 65 and the lower concave mold 76 are accurately molded.

[0054] An outer slide rail 713 is provided on the outer side of the movable slide rail 72, and the outer slide rail 713 is slidably matched with the fixed rail 71. A fixed plug 712 is fixedly connected to one end of the movable slide rail 72 close to the locking seat 8. An inner slide rail 710 is provided on the inner side of the movable slide rail 72. A square groove 711 is provided on the movable slide rail 72. The inner slide rail 710 is slidably matched with the movable plate 73. The fixed plug 712 on the movable slide rail 72 is inserted into the slot 82, and the steel ball 85 is pushed into the groove on the fixed plug 712 by the third spring 84 to lock it, so that the inner slide rail 710 is aligned with the guide groove 86.

[0055] A plurality of rollers 714 are rotatably connected to both sides of the movable plate 73. A first groove 715 is provided on both sides of the movable plate 73. A wedge block 716 is rotatably connected in the first groove 715. A rubber wheel 717 is rotatably connected to the wedge block 716. A second spring 718 is fixedly connected between the wedge block 716 and the movable plate 73. A cylinder 719 is fixedly connected to one end of the movable plate 73 close to the locking seat 8. A guide head 720 is fixedly connected to the one end of the cylinder 719 away from the movable plate 73. The upper sliding connection is provided with a movable ring 721, and a limiting ring 722 is fixedly provided on the cylinder 719. The wedge block 716 and the square groove 711 are engaged with each other, and the pull rod 94 drives the movable plate 73 to continue to move, so that the resistance of the wedge block 716 is greater than the elastic force of the second spring 718, so that the wedge block 716 is pushed into the first groove 715, so that the movable plate 73 can continue to move, and the roller 714 enters the guide groove 86, so that the movable plate 73 moves to the support frame 81. In the process of returning to the original position, the wedge block When the movable plate 73 is restored to its original position, the pull rod 94 drives the locking sleeve 95 to continue to move forward, so that the wedge-shaped bayonet 97 pushes the movable ring 721 to move, and the movable ring 721 is blocked by the limit ring 722, so that the wedge-shaped bayonet 97 is pushed into the wall of the locking sleeve 95, so that the wedge-shaped bayonet 97 moves to between the movable ring 721 and the movable plate 73, and then the motor 92 is reversed, The pull rod 94 drives the locking sleeve 95 to move outward, and the movable ring 721 is pulled to the guide head 720, so that the movable ring 721 is close to the guide head 720, so that the wedge pin 97 cannot be inserted between the movable ring 721 and the guide head 720, so that the locking sleeve 95 is separated from the guide head 720. By using the rubber wheel 717, the wear of the wedge block 716 when moving in the inner slide rail 710 and the guide groove 86 can be reduced, and the use of the roller 714 can make the movable plate 73 easier to move.

[0056] like Figure 3 As shown, the lower end of the hydraulic rod 4 is fixedly connected with a movable crossbeam 6, and the movable crossbeam 6 includes a movable seat 61 that passes through the sliding connection column 2, and the lower surface of the movable seat 61 is fixedly connected with a plurality of first fixing clamps 62, and the first fixing clamps 62 are fixedly connected with a first fixing plate 63, and the lower surface of the first fixing plate 63 is fixedly connected with an upper punch 65, and the lower surface of the first fixing plate 63 is fixedly connected with a plurality of positioning sleeves 64. By using the positioning sleeves 64, the upper punch 65 can be aligned with the lower die 76 when moving downward.

[0057] like Figure 4 and Figure 5As shown, safety protection mechanisms 5 are provided on both sides of the movable crossbeam 6. The safety protection mechanisms 5 include fixing bolts 51 fixedly connected to both sides of the movable seat 61. The fixing bolts 51 are provided with fixing grooves 52. Nuts 53 are threadedly connected to the fixing bolts 51. Control steel ropes 54 are fixedly connected in the fixing grooves 52. Pulleys 55 are rotatably connected to both sides of the upper crossbeam 3. The control steel ropes 54 are sleeved outside the pulleys 55. One end of the control steel ropes 54 away from the fixing bolts 51 is fixedly connected to a protective fence 56. The hydraulic rod 4 pushes the movable crossbeam 6 downward, and the conical head 79 is inserted into the positioning sleeve 64 for positioning adjustment to ensure that the upper punch 65 and the lower die 76 are accurately molded. At this time, the fixing bolts 51 on the movable crossbeam 6 drive the protective fence 56 to rise by bypassing the pulley 55 through the control steel rope 54 to prevent staff from entering the dangerous area during the hot pressing process. The length of the control steel rope 54 can be adjusted by loosening the nuts 53 to adapt to protective fences 56 of different heights.

[0058] like Fig.14 and Fig.15 As shown, a locking seat 8 is provided on one side of the workbench 1, and the locking seat 8 includes a support frame 81, a pair of guide grooves 86 are opened on the inner side of the support frame 81, and a pair of slots 82 are opened at one end of the support frame 81 close to the workbench 1, and second grooves 83 are opened on the upper and lower sides of the slots 82, and a third spring 84 is fixedly connected in the second groove 83, and a steel ball 85 is fixedly connected on the third spring 84, and racks 87 are fixedly connected on both sides of the upper surface of the support frame 81, and the third spring 84 pushes the steel ball 85 into the groove on the fixed plug 712 to lock it, so that the inner slide rail 710 is aligned with the guide groove 86.

[0059] like Fig.14 and Fig.16 As shown, the upper surface of the locking seat 8 is slidably connected with a loading and unloading mechanism 9, and the loading and unloading mechanism 9 includes a movable base 91 slidably connected in the guide groove 86, and motors 92 are fixedly connected on both sides of the upper surface of the movable base 91, and a gear 93 is fixedly connected to the output end of the motor 92, and the gear 93 and the rack 87 are meshed with each other. The end of the movable base 91 close to the workbench 1 is fixedly connected with a pull rod 94, and the end of the pull rod 94 away from the movable base 91 is fixedly connected with a locking sleeve 95, and wedge-shaped pins 97 are slidably connected on both sides of the locking sleeve 95, and a fourth spring 96 is fixedly connected to the wedge-shaped pin 97, and the fourth spring 96 is fixedly connected to the locking sleeve 95. The motor 92 drives the gear 93 to rotate, and the gear 93 cooperates with the rack 87 to move the movable base 91 toward the workbench 1, and the guide head 720 is clamped by the wedge-shaped pin 97. Then the motor 92 reverses and drives the movable base 91 to move outward, so that the movable plate 73 is pulled out.

[0060] The working principle of this embodiment is as follows: during the hot pressing operation, the motor 92 drives the gear 93 to rotate, and the gear 93 cooperates with the rack 87 to move the movable base 91 toward the workbench 1, and then the guide head 720 is inserted into the locking sleeve 95. At this time, the guide head 720 pushes away the wedge-shaped bayonet 97, so that the wedge-shaped bayonet 97 enters between the guide head 720 and the movable ring 721 under the push of the fourth spring 96, and the guide head 720 is clamped by the wedge-shaped bayonet 97. Then, the motor 92 reverses to drive the movable base 91 to move outward, so that the movable plate 73 is pulled out. At this time, the wedge block 716 is pushed by the second spring 718, so as to engage with the square groove 711, so that the movable plate 73 drives the movable slide rail 72 to move outward;

[0061] Then, the fixed plug 712 on the movable slide rail 72 is inserted into the slot 82, and the third spring 84 pushes the steel ball 85 into the groove on the fixed plug 712 to lock it, so that the inner slide rail 710 is aligned with the guide groove 86. At this time, when the pull rod 94 drives the movable plate 73 to continue to move, the resistance of the wedge block 716 is greater than the elastic force of the second spring 718, so that the wedge block 716 is pushed into the first groove 715, so that the movable plate 73 can continue to move, and the roller 714 enters the guide groove 86, so that the movable plate 73 moves to the support frame 81;

[0062] Then the worker lays the raw material in the lower concave mold 76. After the laying is completed, the motor 92 is started to drive the movable plate 73 to return to its original position. During the return process, the wedge block 716 is pushed into the square groove 711 by the second spring 718, thereby driving the movable slide rail 72 to return to its original position after being locked by the steel ball 85. When the movable plate 73 returns to its original position, the pull rod 94 drives the locking sleeve 95 to continue to move forward, so that the wedge-shaped bayonet pin 97 pushes the movable ring 721 to move, and the movable ring 721 is blocked by the limit ring 722. The wedge-shaped bayonet 97 is blocked, so that the wedge-shaped bayonet 97 is pushed into the wall of the locking sleeve 95, so that the wedge-shaped bayonet 97 moves to between the movable ring 721 and the movable plate 73, and then the motor 92 is reversed, and the locking sleeve 95 is driven to move outward through the pull rod 94, and the movable ring 721 is pulled to the guide head 720, so that the movable ring 721 is close to the guide head 720, so that the wedge-shaped bayonet 97 cannot be inserted between the movable ring 721 and the guide head 720, so that the locking sleeve 95 is separated from the guide head 720;

[0063] Then the hydraulic rod 4 pushes the movable crossbeam 6 downward, and inserts the conical head 79 into the positioning sleeve 64 for positioning adjustment to ensure that the upper punch 65 and the lower die 76 are accurately molded. At this time, the fixing bolt 51 on the movable crossbeam 6 drives the protective fence 56 to rise by controlling the steel rope 54 to bypass the pulley 55, so as to prevent the staff from entering the dangerous area during the hot pressing process. The length of the control steel rope 54 can be adjusted by loosening the nut 53, so as to adapt to the protective fence 56 of different heights.

[0064] After the hot pressing is completed, the hydraulic rod 4 drives the movable crossbeam 6 to move upward, and then drives the movable lower mold 7 to move out through the loading and unloading mechanism 9 for unloading.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A process for preparing a flame retardant density board, characterized in that: The method comprises weighing the following raw materials in parts by weight: 70-85 parts of wood fiber, 8-15 parts of urea-formaldehyde resin, and 3-10 parts of aluminum hydroxide. The specific preparation process is as follows: Step 1: Put wood fiber, urea-formaldehyde resin and aluminum hydroxide into a mixer at a ratio of 8:1:1, and stir at a speed of 40r / min for 20min; Step 2: Spread the mixed raw materials evenly in the lower mold of the hot press with a thickness of 10 cm; Step 3: Use a hot press to heat press the raw materials into a density board; Step 4: Take out the density board and polish it with a grinder; Step 5: Cut the polished density board into a predetermined size, and then evenly spray water-based polyurethane coating on the surface of the density board; The hot press comprises a workbench (1), the upper surface of the workbench (1) is fixedly connected to a movable lower mold (7), the upper surface of the workbench (1) is fixedly connected to a plurality of columns (2), one end of the column (2) away from the workbench (1) is fixedly connected to an upper crossbeam (3), the lower end of the upper crossbeam (3) is fixedly connected to a hydraulic rod (4), the lower end of the hydraulic rod (4) is fixedly connected to a movable crossbeam (6), both sides of the movable crossbeam (6) are provided with safety protection mechanisms (5), a locking seat (8) is provided on one side of the workbench (1), and a loading and unloading mechanism (9) is slidably connected to the upper surface of the locking seat (8); The movable lower mold (7) comprises a pair of fixed rails (71) fixedly connected to the upper surface of the workbench (1), wherein the pair of fixed rails (71) are both slidably connected with movable slide rails (72), a movable plate (73) is slidably connected between the movable slide rails (72), a plurality of second fixed clamps (74) are fixedly connected to the movable plate (73), a second fixed clamp (74) is fixedly connected to the second fixed plate (75), a plurality of guide columns (77) are fixedly connected to the upper surface of the second fixed plate (75), a conical head (79) is slidably connected through the guide column (77), a first spring (78) is fixedly connected to the lower end of the conical head (79), a lower concave mold (76) is fixedly connected to the upper surface of the second fixed plate (75), and a baffle is fixedly connected to one end of the fixed rail (71) away from the locking seat (8); An outer side of the movable slide rail (72) is provided with an outer slide rail (713), the outer slide rail (713) is slidably matched with the fixed rail (71), one end of the movable slide rail (72) close to the locking seat (8) is fixedly connected with a fixed plug (712), an inner side of the movable slide rail (72) is provided with an inner slide rail (710), a square groove (711) is provided on the movable slide rail (72), and the inner slide rail (710) is slidably matched with the movable plate (73); A plurality of rollers (714) are rotatably connected to both sides of the movable plate (73), a first groove (715) is provided on both sides of the movable plate (73), a wedge block (716) is rotatably connected in the first groove (715), a rubber wheel (717) is rotatably connected to the wedge block (716), a second spring (718) is fixedly connected between the wedge block (716) and the movable plate (73), a cylinder (719) is fixedly connected to one end of the movable plate (73) close to the locking seat (8), a guide head (720) is fixedly connected to one end of the cylinder (719) away from the movable plate (73), a movable ring (721) is slidably connected to the cylinder (719), a limit ring (722) is fixedly sleeved on the cylinder (719), and the wedge block (716) and the square groove (711) are engaged with each other; The locking seat (8) comprises a support frame (81), a pair of guide grooves (86) are formed on the inner side of the support frame (81), a pair of slots (82) are formed on one end of the support frame (81) close to the workbench (1), second grooves (83) are formed on the upper and lower sides of the slots (82), a third spring (84) is fixedly connected to the second groove (83), a steel ball (85) is fixedly connected to the third spring (84), and racks (87) are fixedly connected to both sides of the upper surface of the support frame (81); The loading and unloading mechanism (9) comprises a movable base (91) slidably connected in the guide groove (86), the upper surface of the movable base (91) is fixedly connected to a motor (92) on both sides, the output end of the motor (92) is fixedly connected to a gear (93), the gear (93) and the rack (87) are meshed with each other, the end of the movable base (91) close to the workbench (1) is fixedly connected to a pull rod (94), the end of the pull rod (94) away from the movable base (91) is fixedly connected to a locking sleeve (95), the locking sleeve (95) is slidably connected to wedge-shaped latches (97) on both sides, the wedge-shaped latches (97) are fixedly connected to a fourth spring (96), and the fourth spring (96) is fixedly connected to the locking sleeve (95).

2. The process for preparing a flame retardant density board according to claim 1, characterized in that: The movable crossbeam (6) comprises a movable seat (61) penetrating the sliding connection column (2); a plurality of first fixing fixtures (62) are fixedly connected to the lower surface of the movable seat (61); a first fixing plate (63) is fixedly connected to the first fixing fixture (62); an upper punch (65) is fixedly connected to the lower surface of the first fixing plate (63); and a plurality of positioning sleeves (64) are fixedly connected to the lower surface of the first fixing plate (63).

3. The process for preparing a flame retardant density board according to claim 2, characterized in that: The safety protection mechanism (5) comprises fixing bolts (51) fixedly connected to both sides of the movable seat (61), the fixing bolts (51) are provided with fixing grooves (52), nuts (53) are threadedly connected to the fixing bolts (51), a control steel rope (54) is fixedly connected in the fixing grooves (52), both sides of the upper cross beam (3) are rotatably connected to pulleys (55), the control steel rope (54) is sleeved outside the pulleys (55), and one end of the control steel rope (54) away from the fixing bolts (51) is fixedly connected to a protective fence (56).

4. The process for preparing a flame retardant density board according to claim 2, characterized in that: The conical head (79) and the positioning sleeve (64) correspond one to one.

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