A grinding device for wooden door frame and a grinding method thereof

Abstract

The present invention belongs to the technical field of wooden door frame production, and discloses a polishing device for wooden door frames and a polishing method thereof, including a workbench, wherein the top of the workbench is fixedly connected to a first limit component and a second limit component, a door frame plate is placed in the middle of the workbench, the middle of the first limit component is movably connected to a side polishing component, and a tightening component is provided at the bottom of the workbench. The present invention facilitates polishing the top of the door frame plate by setting the cooperation of structures such as the second limit component and the flip base, and polishes the top of the door frame plate by the flip base of the slider to reciprocate along the linear guide rail body, and at the same time, the middle baffle slides inside the installation groove at the top of the door frame plate, and facilitates polishing the side of the door frame plate by setting the cooperation of structures such as the side polishing component and the limit protection component, and drives the sliding support plate to slide by pushing the support slide bar through the electric telescopic rod.

Description

Technical Field

[0001] The invention belongs to the technical field of wooden door frame production, and in particular relates to a grinding device for wooden door frames and a grinding method thereof. Background Art

[0002] A wooden door frame refers to the frame part between the door leaf and the wall. It is made of wood, usually attached to the door opening, and connects the door leaf to the wall. A solid wood door frame is made of solid wood and has the characteristics of corrosion resistance, no cracks, and excellent sound insulation.

[0003] When polishing a wooden door frame, since there are multiple grooves on the wooden door frame, the traditional polishing method is to directly polish the entire door frame without protecting the grooves. In order to avoid wear on the edges of the grooves, which affects the aesthetics of the door frame and the installation and use of hardware, as well as the stability and safety of the hardware, a polishing device and a polishing method for wooden door frames are proposed. Summary of the Invention

[0004] In order to solve the problem in the above background technology that the traditional grinding method does not protect the notch, the present invention provides a grinding device for a wooden door frame and a grinding method thereof.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a grinding device for a wooden door frame, comprising a workbench, a first limiting assembly and a second limiting assembly being fixedly connected to the top of the workbench, a door frame plate being placed in the middle of the workbench, a side grinding assembly being movably connected to the middle of the first limiting assembly, a tightening assembly being provided at the bottom of the workbench, a pair of limiting protection assemblies being provided inside the first limiting assembly, and a conveying roller being installed in the middle of the workbench;

[0006] The position limiting protection assembly includes a pair of position limiting brackets and two pairs of fixed bases. A pair of position limiting baffles are slidably connected inside the position limiting brackets. The ends of the position limiting baffles that are away from each other are fixedly connected to spring cylinders.

[0007] Preferably, the first limiting assembly includes a main body bracket, a pressing roller is movably connected to one side of the main body bracket, a pair of first springs are fixedly connected to the middle of the pressing roller, and a pair of first sliding grooves and a pair of second sliding grooves are opened inside the main body bracket;

[0008] The main body bracket is fixedly connected to the workbench, the downward pressure roller is located on the side of the main body bracket away from the second limit assembly, the bottom of the first spring is fixedly connected to the main body bracket, the first slide groove and the main body bracket are cross-distributed, and the second slide groove and the downward pressure roller are parallel distributed.

[0009] Preferably, a middle baffle is slidably connected to the middle of the second limiting component, and a flip base is rotatably connected to the middle of the second limiting component. Installation grooves are provided on both sides and the top of the door frame plate. The middle baffle is located inside the installation groove and matches the specifications of the installation groove. A pair of flip blocks are provided on one side of the flip base, and a second grinding block is fixedly connected to the bottom of the flip block. The flip blocks are mirror-distributed on both sides of the flip base, and the second grinding block conflicts with the top of the door frame plate.

[0010] Preferably, the second limiting assembly includes a pair of linear guide rail bodies, wherein a slider is slidably connected to the middle of the linear guide rail bodies, and a pair of support frames are fixedly connected to the middle of the linear guide rail bodies, and the support frames are slidably connected to the middle baffle;

[0011] The slider is rotatably connected to the flip base, and the slider is clamped to the flip clamping block.

[0012] Preferably, the side grinding assembly includes a pair of electric telescopic rods, the output ends of the electric telescopic rods are fixedly connected to support slide rods, both ends of the support slide rods are slidably connected to sliding support plates, and the lower ends of the sliding support plates are fixedly connected to the first grinding block;

[0013] The electric telescopic rod is fixedly connected to the middle of the main frame, the two ends of the support slide are slidably connected to the inside of the first slide groove, the sliding support plate is located on both sides of the door frame plate, and the first grinding block is in conflict with the door frame plate.

[0014] Preferably, the tightening assembly includes an extrusion block, a second spring is fixedly connected to the interior of the extrusion block, the lower end of the second spring is rotatably connected to a pair of spring support rods, and the ends of the spring support rods that are away from each other are both rotatably connected to a sliding bracket;

[0015] The top of the extrusion block is arc-shaped and contacts the door frame plate. The extrusion block is located in the middle of the workbench and is slidably connected to the workbench. The bottom of the second spring is fixedly connected to the workbench. The sliding bracket is slidably connected to the workbench.

[0016] Preferably, the limit protection assembly also includes a fixed base, one end of the fixed base is rotatably connected to a pair of first push plates, the ends of the pair of first push plates away from the fixed base are rotatably connected to a second push plate, a pair of second push plates are rotatably connected to an end close to the door frame plate, and the ends of the second push plates away from each other are each provided with a limit protrusion.

[0017] Preferably, the limit bracket is slidably connected to the top of the workbench, the limit bracket is distributed on both sides of the door frame plate and is in conflict with the door frame plate, the limit bracket is slidably connected to the sliding bracket, the limit baffle is located inside the side mounting groove of the door frame plate, the limit baffle is in conflict with the door frame plate, a pair of limit baffles are away from the side of the door frame plate and are close to each other at a corner with an inclined surface, the spring tube is located inside the limit bracket and is fixedly connected to the limit bracket.

[0018] Preferably, the fixed base is fixedly connected to the sliding bracket, the first push plate is located on the inner side of the second push plate, the second push plate and the third push plate are located in the middle of a pair of limit baffles, the second push plate is in conflict with the limit baffle, and the third push plate is in conflict with the inclined surface in the middle of the limit baffle.

[0019] A method for polishing a wooden door frame comprises the following steps:

[0020] S1. Dry the wood used as the raw material for the door frame to reduce its moisture content and prevent deformation or cracking during subsequent processing. Then perform preliminary processing on the wood. Use a wiping tool or vacuum cleaner to clean the surface of the door frame to remove dust and impurities, ensuring that the surface of the door frame is clean and dust-free.

[0021] S2. First, use large-grain sandpaper or a grinding tool to perform preliminary grinding on the wood to perform rough grinding on the wood to remove burrs, unevenness and traces left by preliminary processing on the surface of the door frame board. Then use small-grain sandpaper or a grinding tool to perform medium grinding to further smooth the surface of the door frame board and remove traces left by rough grinding. Finally, use fine-grain sandpaper or a grinding tool to perform fine grinding to remove minor flaws and scratches left by medium grinding.

[0022] S3. Use clean water or detergent to clean the surface of the door frame to remove the dust and stains generated during the grinding process. Check whether the surface of the door frame is flat and smooth, without dents or scratches. According to actual needs, wax, oil or paint the door frame.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention facilitates the polishing of the top of the door frame plate by providing the cooperation of the second limiting component and the flip base and other structures. The slider flips the base to reciprocate along the linear guide rail body to polish the top of the door frame plate. At the same time, the middle baffle slides inside the installation groove at the top of the door frame plate to support and protect the notch to prevent damage to the notch and limit the door frame plate.

[0025] The present invention facilitates the grinding of the side surfaces of the door frame plate by arranging the cooperation of the side grinding assembly and the limit protection assembly. The electric telescopic rod pushes the support slide rod to drive the sliding support plate to slide, so that the first grinding block grinds both sides of the door frame plate, thereby maintaining stable grinding of the side surfaces of the door frame plate and ensuring the grinding quality. At the same time, the limit baffle protects the notch of the installation groove.

[0026] The present invention cooperates with structures such as a tightening component and a limit protection component to facilitate the limit baffle to enter the installation groove on the side of the door frame plate. The door frame plate squeezes the extrusion block to move, so that the extrusion block pulls the sliding bracket to the middle through the spring support rod, and then the sliding bracket pushes the fixed base to move, and the fixed base pushes the limit baffle to expand, so that the limit baffle contacts the inner wall of the installation groove, protecting the notch of the installation groove, so that the limit baffle is closed before entering the installation groove, and will only open after entering the installation groove, thereby facilitating the movement of the door frame plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a partial cross-sectional view of the first limiting component of the present invention;

[0029] Figure 3 This is a partial enlarged cross-sectional view of the main support of the present invention;

[0030] Figure 4 This is an enlarged cross-sectional view of the tightening assembly of the present invention;

[0031] Figure 5 This is an enlarged cross-sectional view of the position limiting protection component of the present invention;

[0032] Figure 6 for Figure 5 A in the middle is an enlarged schematic diagram;

[0033] Figure 7 This is a schematic diagram of the disassembly of the position limiting protection component of the present invention;

[0034] Figure 8 This is a cross-sectional schematic diagram of the second limiting component of the present invention.

[0035] In the figure: 1. workbench; 2. first limit assembly; 21. main bracket; 22. pressing roller; 23. first spring; 24. first slide; 25. second slide; 3. second limit assembly; 31. linear guide body; 32. slider; 33. support frame; 4. door frame plate; 5. side grinding assembly; 51. electric telescopic rod; 52. supporting slide; 53. sliding support plate; 54. first grinding block; 6. tightening assembly; 61. extrusion block; 62. second spring; 63. spring support rod; 64. sliding bracket; 7. limit protection assembly; 71. limit bracket; 72. limit baffle; 73. spring cylinder; 74. fixed base; 75. first push plate; 76. second push plate; 77. third push plate; 78. limit protrusion block; 8. conveyor roller; 9. middle baffle; 10. flip base; 11. flip block; 12. second grinding block. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] like Figures 1 to 8 As shown, the present invention provides a grinding device for wooden door frames, comprising a workbench 1, a first limiting assembly 2 and a second limiting assembly 3 are fixedly connected to the top of the workbench 1, a door frame plate 4 is placed in the middle of the workbench 1, a side grinding assembly 5 is movably connected to the middle of the first limiting assembly 2, a tightening assembly 6 is provided at the bottom of the workbench 1, a pair of limiting protection assemblies 7 are provided on the inner side of the first limiting assembly 2, and a conveying roller 8 is installed in the middle of the workbench 1;

[0038] The position limiting protection assembly 7 includes a pair of position limiting brackets 71 and two pairs of fixed bases 74 . A pair of position limiting baffles 72 are slidably connected inside the position limiting brackets 71 , and one end of the position limiting baffles 72 away from each other is fixedly connected to a spring tube 73 .

[0039] When the door frame plate 4 is polished, the sliding block 12 is used to polish the top of the door frame plate 4, and then the sliding block 12 is used to polish the top of the door frame plate 4.

[0040] like Figure 2 and Figure 3 As shown, the first limiting assembly 2 includes a main frame 21, a pressing roller 22 is movably connected to one side of the main frame 21, a pair of first springs 23 are fixedly connected to the middle of the pressing roller 22, and a pair of first sliding grooves 24 and a pair of second sliding grooves 25 are opened inside the main frame 21;

[0041] The main bracket 21 is fixedly connected to the workbench 1, the downward pressure roller 22 is located on the side of the main bracket 21 away from the second limit assembly 3, the bottom of the first spring 23 is fixedly connected to the main bracket 21, the first slide groove 24 and the main bracket 21 are cross-distributed, and the second slide groove 25 and the downward pressure roller 22 are parallel distributed.

[0042] The above scheme is adopted: by setting the first limiting component 2, the main bracket 21 supports and limits the side grinding component 5 and the limiting protection component 7, and by setting the downward pressure roller 22, the downward pressure roller 22 presses the door frame plate 4 downward to limit the door frame plate 4, so that the door frame plate 4 maintains stable movement. At the same time, after the door frame plate 4 moves out of the second limiting component 3, the door frame plate 4 will not be squeezed by the block 61. The opening of the first slide groove 24 and the second slide groove 25 facilitates the stable movement of the support slide rod 52 and the limiting bracket 71. The first spring 23 set inside the downward pressure roller 22 facilitates the application of downward pulling force to the downward pressure roller 22, so that the door frame plate 4 maintains stable movement.

[0043] like Figure 1 、 Figure 4 and Figure 8As shown, the middle part of the second limiting component 3 is slidably connected to the middle baffle 9, and the middle part of the second limiting component 3 is rotatably connected to the flip base 10. Installation grooves are provided on both sides and the top of the door frame plate 4. The middle baffle 9 is located inside the installation groove and matches the specifications of the installation groove. A pair of flip blocks 11 are provided on one side of the flip base 10, and the bottom of the flip block 11 is fixedly connected to the second grinding block 12. The flip blocks 11 are distributed on both sides of the flip base 10 in a mirror-image manner, and the second grinding block 12 conflicts with the top of the door frame plate 4.

[0044] The above-mentioned solution is adopted: by setting the middle baffle 9, when the top of the door frame plate 4 is polished, the middle baffle 9 can slide inside the mounting groove at the top of the door frame plate 4, so that when the flip block 11 is polished on the top surface of the door frame plate 4, the edge of the mounting groove at the top of the door frame plate 4 is filled with the middle baffle 9, thereby protecting the edge of the groove, and a flip block 11 is provided on the flip base 10; it is used to fix the flip base 10, and the flip block 11 is clamped with the second polishing block 12 to keep the flip base 10 level, so as to maintain stable polishing of the top of the door frame plate 4.

[0045] like Figure 1 and Figure 8 As shown, the second limiting assembly 3 includes a pair of linear guide rail bodies 31, a slider 32 is slidably connected to the middle of the linear guide rail bodies 31, and a support frame 33 is fixedly connected to the middle of the pair of linear guide rail bodies 31, and the support frame 33 is slidably connected to the middle baffle 9;

[0046] The slider 32 is rotatably connected to the flip base 10 , and the slider 32 is engaged with the flip block 11 .

[0047] The above solution is adopted: by setting a second limit component 3, the slider 32 drives the flip base 10 to reciprocate along the linear guide rail body 31, so that the flip base 10 drives the second grinding block 12 to grind the top of the door frame plate 4, and the support frame 33 supports the middle baffle 9, so that the middle baffle 9 slides inside the installation groove at the top of the door frame plate 4, supporting and protecting the slot to avoid damage to the slot.

[0048] like Figure 3 、 Figure 5 and Figure 8 As shown, the side grinding assembly 5 includes a pair of electric telescopic rods 51, the output end of the electric telescopic rod 51 is fixedly connected to a support slide 52, both ends of the support slide 52 are slidably connected to a sliding support plate 53, and the lower end of the sliding support plate 53 is fixedly connected to a first grinding block 54;

[0049] The electric telescopic rod 51 is fixedly connected to the middle of the main frame 21, the two ends of the support slide 52 are slidably connected to the inside of the first slide groove 24, the sliding support plate 53 is located on both sides of the door frame plate 4, and the first grinding block 54 is in contact with the door frame plate 4.

[0050] The above-mentioned scheme is adopted: by setting up a side grinding assembly 5, the electric telescopic rod 51 pushes the supporting slide bar 52 to slide along the first slide groove 24, so that the supporting slide bar 52 drives the sliding support plate 53 to slide, and the two sides of the door frame plate 4 are grinded by the first grinding block 54. By setting up the electric telescopic rod 51 and the supporting slide bar 52, the sliding support plate 53 can maintain a stable and uniform speed to drive the first grinding block 54 to move back and forth horizontally. At the same time, the lower end of the sliding support plate 53 is slidably connected to the middle part of the limit bracket 71, so that the first grinding block 54 will maintain a conflicting state with the door frame plate 4.

[0051] like Figures 3 to 5 As shown, the tightening assembly 6 includes an extrusion block 61, a second spring 62 is fixedly connected to the interior of the extrusion block 61, the lower end of the second spring 62 is rotatably connected to a pair of spring support rods 63, and the ends of the spring support rods 63 that are away from each other are rotatably connected to a sliding bracket 64;

[0052] The top of the extrusion block 61 is arc-shaped and the top of the extrusion block 61 is in conflict with the door frame plate 4. The extrusion block 61 is located in the middle of the workbench 1 and is slidingly connected to the workbench 1. The bottom of the second spring 62 is fixedly connected to the workbench 1, and the sliding bracket 64 is slidingly connected to the workbench 1.

[0053] The above-mentioned scheme is adopted: the setting of the tightening component 6 is used to push the limit baffle 72 to expand, and it conflicts with the inner wall of the side mounting groove of the door frame plate 4. The top of the extrusion block 61 is arc-shaped and set at the bottom of the door frame plate 4. The extrusion block 61 is squeezed by the door frame plate 4 to move downward, so that the extrusion block 61 drives the spring support rod 63 to move downward, and the sliding bracket 64 is pulled toward the middle by the spring support rod 63, so that the sliding bracket 64 pushes the fixed base 74 to move, so as to ensure that the fixed base 74 pushes the limit baffle 72 to expand.

[0054] like Figures 5 to 7 As shown, the limit protection assembly 7 also includes a fixed base 74, one end of the fixed base 74 is rotatably connected to a pair of first push plates 75, the ends of the pair of first push plates 75 away from the fixed base 74 are rotatably connected to the second push plates 76, the ends of the pair of second push plates 76 close to the door frame plate 4 are rotatably connected to the third push plates 77, and the ends of the second push plates 76 away from each other are provided with limit protrusions 78.

[0055] The above scheme is adopted: by setting a limit protection component 7, the limit baffle 72 is driven to move by the limit bracket 71, and the fixed base 74 is pushed to move by the sliding bracket 64. The fixed base 74 first pushes the third push plate 77 through the first push plate 75 and the second push plate 76 to squeeze the limit baffle 72 to open, and then the limit protrusion block 78 contacts the limit baffle 72, thereby pushing the limit bracket 71 to move toward the door frame plate 4 and contact the door frame plate 4. At the same time, the limit baffle 72 enters the installation groove on the side of the door frame plate 4, and then the fixed base 74 continues to push the first push plate 75 to squeeze the second push plate 76 to open the upper and lower sides, so that the limit baffle 72 is pushed open synchronously, so that the limit baffle 72 contacts the inner wall of the installation groove to protect the notch of the installation groove.

[0056] like Figures 5 to 7 As shown, the limit bracket 71 is slidably connected to the top of the workbench 1, the limit brackets 71 are distributed on both sides of the door frame plate 4 and conflict with the door frame plate 4, the limit bracket 71 is slidably connected to the sliding bracket 64, the limit baffle 72 is located inside the side mounting groove of the door frame plate 4, the limit baffle 72 conflicts with the door frame plate 4, a pair of limit baffles 72 are away from the side of the door frame plate 4 and are close to each other. A bevel is provided at a corner, the spring cylinder 73 is located inside the limit bracket 71 and fixedly connected to the limit bracket 71, the fixed base 74 is fixedly connected to the sliding bracket 64, the first push plate 75 is located on the inner side of the second push plate 76, the second push plate 76 and the third push plate 77 are located in the middle of the pair of limit baffles 72, the second push plate 76 conflicts with the limit baffle 72, and the third push plate 77 conflicts with the bevel in the middle of the limit baffle 72.

[0057] The above solution is adopted: by providing a limit bracket 71 and a limit baffle 72, the limit bracket 71 drives the first grinding block 54 to contact the side of the door frame plate 4, and at the same time drives the limit baffle 72 to enter the installation groove. The setting of the limit baffle 72 can fit the inner wall of the installation groove to protect the groove from being damaged by grinding. The spring cylinder 73 is used to keep the limit baffle 72 in a closed state when no door frame plate 4 passes through the middle of the limit bracket 71, so as to facilitate the limit baffle 72 to enter the installation groove. By providing a fixed base 74, the fixed base 74 pushes the first push plate 75, the second push plate 76 and the third push plate 77, so that the limit baffle 72 can be squeezed open;

[0058] When the limit baffle 72 is in the closed state, the sliding bracket 64 will pull the fixed base 74 to move, and the fixed base 74 will drive the first push plate 75 and the second push plate 76 to move into the sliding channel between the sliding bracket 64 and the limit bracket 71, so that when the sliding bracket 64 pushes the fixed base 74 again, the fixed base 74 will push the first push plate 75 and the second push plate 76 out of the channel. At this time, the third push plate 77 is squeezed into the middle of the limit baffle 72, so that it can continue to move to push the limit baffle 72 open.

[0059] like Figures 1 to 8 As shown, the present invention provides a method for polishing a wooden door frame, comprising the following steps:

[0060] S1. Dry the wood used as the raw material of the door frame plate 4 to reduce its moisture content and prevent deformation or cracking during subsequent processing. Then, perform preliminary processing on the wood. Then, use a wiping tool or a vacuum cleaner to clean the surface of the door frame plate 4 to remove dust and impurities, ensuring that the surface of the door frame plate 4 is clean and dust-free.

[0061] S2. First, use large-grain sandpaper or a grinding tool to perform preliminary grinding on the wood to perform rough grinding on the wood to remove burrs, unevenness and traces left by preliminary processing on the surface of the door frame plate 4. Then use small-grain sandpaper or a grinding tool to perform medium grinding to further smooth the surface of the door frame plate 4 and remove traces left by rough grinding. Finally, use fine-grain sandpaper or a grinding tool to perform fine grinding to remove minor flaws and scratches left by medium grinding.

[0062] S3. Use clean water or detergent to clean the surface of the door frame plate 4 to remove dust and stains generated during the grinding process, check whether the surface of the door frame plate 4 is flat and smooth, without dents or scratches, and then wax, oil or paint the door frame plate 4 according to actual needs.

[0063] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0064] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A grinding device for a wooden door frame, comprising a workbench (1), characterized in that: The top of the workbench (1) is fixedly connected to a first limiting assembly (2) and a second limiting assembly (3); a door frame plate (4) is placed in the middle of the workbench (1); the middle of the first limiting assembly (2) is movably connected to a side grinding assembly (5); a tightening assembly (6) is provided at the bottom of the workbench (1); a pair of limiting protection assemblies (7) are provided inside the first limiting assembly (2); and a conveying roller (8) is installed in the middle of the workbench (1); The position limiting protection assembly (7) comprises a pair of position limiting brackets (71) and two pairs of fixed bases (74); a pair of position limiting baffles (72) are slidably connected inside the position limiting brackets (71); and the positions of the position limiting baffles (72) are fixedly connected to spring cylinders (73) at their ends away from each other. The first limiting assembly (2) includes a main frame (21), one side of the main frame (21) is movably connected to a downward pressing roller (22), the middle of the downward pressing roller (22) is fixedly connected to a pair of first springs (23), and the interior of the main frame (21) is provided with a pair of first sliding grooves (24) and a pair of second sliding grooves (25); The main support (21) is fixedly connected to the workbench (1), the pressing roller (22) is located on a side of the main support (21) away from the second limiting assembly (3), the bottom of the first spring (23) is fixedly connected to the main support (21), the first chute (24) and the main support (21) are cross-distributed, and the second chute (25) and the pressing roller (22) are parallel distributed; The middle part of the second limiting component (3) is slidably connected to a middle baffle (9), and the middle part of the second limiting component (3) is rotatably connected to a flip base (10). The door frame plate (4) is provided with mounting grooves on both sides and the top. The middle baffle (9) is located inside the mounting groove and matches the specifications of the mounting groove. A pair of flip blocks (11) are provided on one side of the flip base (10). The bottom of the flip block (11) is fixedly connected to a second grinding block (12). The flip blocks (11) are distributed on both sides of the flip base (10) in a mirror image. The second grinding block (12) contacts the top of the door frame plate (4). The tightening assembly (6) comprises an extrusion block (61), a second spring (62) is fixedly connected inside the extrusion block (61), the lower end of the second spring (62) is rotatably connected to a pair of spring support rods (63), and the ends of the spring support rods (63) that are away from each other are both rotatably connected to a sliding bracket (64); The top of the extrusion block (61) is in an arc shape and contacts the door frame plate (4). The extrusion block (61) is located in the middle of the workbench (1) and is slidably connected to the workbench (1). The bottom of the second spring (62) is fixedly connected to the workbench (1). The sliding bracket (64) is slidably connected to the workbench (1). The position limiting protection assembly (7) further comprises a fixed base (74), one end of the fixed base (74) is rotatably connected to a pair of first push plates (75), the ends of the pair of first push plates (75) away from the fixed base (74) are both rotatably connected to a second push plate (76), the ends of the pair of second push plates (76) close to the door frame plate (4) are both rotatably connected to a third push plate (77), and the ends of the second push plates (76) away from each other are both provided with a position limiting protrusion (78).

2. The grinding device for wooden door frames according to claim 1, characterized in that: The second limiting assembly (3) comprises a pair of linear guide rail bodies (31), wherein a slider (32) is slidably connected to the middle of the linear guide rail bodies (31), and a support frame (33) is fixedly connected to the middle of the pair of linear guide rail bodies (31), and the support frame (33) is slidably connected to the middle baffle (9); The slider (32) is rotatably connected to the flip base (10), and the slider (32) is clamped to the flip clamping block (11).

3. The grinding device for wooden door frames according to claim 1, characterized in that: The side grinding assembly (5) comprises a pair of electric telescopic rods (51), the output ends of the electric telescopic rods (51) are fixedly connected to support slide rods (52), both ends of the support slide rods (52) are slidably connected to sliding support plates (53), and the lower ends of the sliding support plates (53) are fixedly connected to the first grinding block (54); The electric telescopic rod (51) is fixedly connected to the middle of the main frame (21), the two ends of the support slide rod (52) are slidably connected to the inside of the first slide groove (24), the sliding support plate (53) is located on both sides of the door frame plate (4), and the first grinding block (54) is in contact with the door frame plate (4).

4. The grinding device for wooden door frames according to claim 1, characterized in that: The limiting bracket (71) is slidably connected to the top of the workbench (1), the limiting bracket (71) is distributed on both sides of the door frame plate (4) and contacts the door frame plate (4), the limiting bracket (71) is slidably connected to the sliding bracket (64), the limiting baffle (72) is located inside the side mounting groove of the door frame plate (4), the limiting baffle (72) contacts the door frame plate (4), a pair of limiting baffles (72) are away from the door frame plate (4) and have an inclined surface at a corner close to each other, and the spring cylinder (73) is located inside the limiting bracket (71) and fixedly connected to the limiting bracket (71).

5. The grinding device for wooden door frames according to claim 1, characterized in that: The fixed base (74) is fixedly connected to the sliding bracket (64), the first push plate (75) is located on the inner side of the second push plate (76), the second push plate (76) and the third push plate (77) are located in the middle of a pair of limit baffles (72), the second push plate (76) is in conflict with the limit baffle (72), and the third push plate (77) is in conflict with the inclined surface in the middle of the limit baffle (72).

6. A method for polishing a wooden door frame, applied to a polishing device for a wooden door frame according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Drying the wood used as the raw material of the door frame plate (4) to reduce its moisture content and prevent deformation or cracking during subsequent processing, and then preliminarily processing the wood. After that, use a wiping tool or a vacuum cleaner to clean the surface of the door frame plate (4) to remove dust and impurities, ensuring that the surface of the door frame plate (4) is clean and dust-free; S2. First, use large-grain sandpaper or a grinding tool to perform preliminary grinding on the wood to perform rough grinding on the wood to remove burrs, unevenness and traces left by preliminary processing on the surface of the door frame plate (4). Then, use small-grain sandpaper or a grinding tool to perform medium grinding to further smooth the surface of the door frame plate (4) and remove traces left by rough grinding. Finally, use fine-grain sandpaper or a grinding tool to perform fine grinding to remove minor flaws and scratches left by medium grinding. S3. Use clean water or detergent to clean the surface of the door frame plate (4) to remove dust and stains generated during the grinding process, check whether the surface of the door frame plate (4) is flat and smooth, without dents or scratches, and then wax, oil or paint the door frame plate (4) according to actual needs.

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