Wood processing equipment safe to operate

By introducing cleaning rollers and vacuuming systems into the wood processing equipment, the problem of wood chip residue after grinding of the wood board is solved, and rapid cleaning and environmental protection of the wood board surface is achieved.

CN223223029UActive Publication Date: 2025-08-15ZHANGWU COUNTY SENLAI FORESTRY CO LTD
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Patent Information

Application Number
CN202422271089.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-18
Publication Date
2025-08-15
Estimated Expiration
2034-09-18

AI Technical Summary

Technical Problem

After grinding, there are wood chips left on the surface of the existing wooden board grinder, which leads to inconvenient subsequent processing and polluting the environment, making cleaning efficiency inefficient.

Method used

A wood processing equipment is designed, equipped with cleaning rollers and vacuum cleaners. The surface of the cleaning roller is equipped with a brush to remove wood chips by rotating. The vacuum cleaner system sucks the wood chips into the negative pressure vacuum cleaner device and collects them into the dust collecting bag.

Benefits of technology

The timely cleaning of wood chips on the surface of the wooden board is achieved, avoiding the scattering of wood chips, improving the cleanliness and operational safety of the working environment, and improving processing efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses wood processing equipment safe to operate, and relates to the field of wood board grinding. The wood board grinding machine comprises a grinding machine body and a wood board, a conveying belt is arranged on the inner side of the grinding machine body, a cleaning mechanism is arranged on the other side of the top of the conveying belt, brushes are assembled on the surfaces of the cleaning mechanism, a dust collection base and a cleaning roller, chippings on the surface of the wood board can be effectively contacted and removed, and meanwhile the chippings can be effectively removed. The dust collection seat and the communicating pipe are arranged and are connected with the external negative pressure dust collection device, when the cleaning roller removes wood chips, the negative pressure dust collection device immediately carries out negative pressure collection on the wood chips through the dust collection seat and the communicating pipe, and then the collected wood chips are conveyed into the dust collection cloth bag to be collected and treated; according to the wood board grinding device, wood chips on the surface of a wood board are rapidly cleaned, the situation that a grinding device is separated from a wood chip cleaning device in the prior art is avoided, and therefore it is guaranteed that the wood chips ground on the surface of the wood board can be cleaned in time.
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Description

Technical Field

[0001] The utility model relates to the field of wood board polishing, in particular to wood processing equipment with safe operation. Background Art

[0002] Wood board sanders are key surface treatment equipment in the woodworking, furniture manufacturing and decoration industries. A motor drives the grinding disc to rotate, removing rough surfaces through friction to achieve a smooth and flat surface. They are available in manual, semi-automatic and fully automatic types to meet the needs of different production scales.

[0003] The wood board sanders currently on the market often cause a certain amount of wood chips to remain on the surface of the wood board during operation, which not only adds unnecessary trouble to the subsequent processing links, but also uses traditional cleaning methods such as high-pressure air blowing and brushing. Although the surface can be cleaned, it often faces problems such as failure to clean in time after sanding is completed, resulting in low cleaning efficiency and wood chips flying everywhere to pollute the working environment. In view of this, there is an urgent need to develop a new type of wood board sander, which must have an efficient and fast wood chip cleaning function on the surface of the wood board to ensure the smooth progress of the subsequent processing process, thereby reducing the specific wood chip cleaning process in the traditional processing process, improving the convenience of wood board processing, and effectively reducing pollution to the surrounding environment, thereby improving overall operating efficiency and environmental protection performance. Utility Model Content

[0004] Based on this, the purpose of the present invention is to provide a wood processing equipment that is safe to operate, so as to solve the technical problem that after the traditional wood board grinder completes the grinding of the wood board, a certain amount of wood chips remain on the surface of the wood board, affecting the subsequent wood board processing.

[0005] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a wood processing equipment with safe operation, comprising a grinder main body and a wooden board, a conveyor belt is provided on the inner side of the grinder main body, two groups of sliding plates are provided above the conveyor belt, a plurality of grinding discs are installed on the bottom surface of the sliding plates, a pressing mechanism is provided on one side of the top of the conveyor belt, a cleaning mechanism is provided on the other side of the top of the conveyor belt, the cleaning mechanism comprises a cleaning roller, both ends of the cleaning roller are rotatably connected to the grinder main body through a bearing seat, a second motor is installed on one side of the grinder main body, and a dust suction seat is installed on one side above the cleaning roller.

[0006] By adopting the above technical solution, the brush arranged on the surface of the cleaning roller can effectively sweep away the wood chips remaining on the wooden board after polishing during the rotation process, thereby ensuring the initial cleaning of the wooden board surface.

[0007] Furthermore, the top of the dust suction seat is connected to the external negative pressure dust suction device and the dust collecting bag through a connecting pipe.

[0008] By adopting the above technical solution, after the wooden board is sanded, the wood chips swept away by the cleaning roller can be immediately sucked into the dust suction seat and quickly transmitted to the negative pressure dust suction device through the connecting pipe. The wood chips will not be retained inside the equipment or scattered in the working area, thereby keeping the working environment clean.

[0009] Furthermore, a brush is provided on the surface of the cleaning roller for cleaning wood chips from the surface of the wooden board when being polished.

[0010] By adopting the above technical solution, these brushes can effectively contact the surface of the wooden board when the cleaning roller rotates, and remove the wood chips generated during the sanding process, ensuring that the wood chips on the surface of the wooden board can be swept away in a timely and thorough manner, thereby improving the cleanliness of the wooden board and the efficiency of subsequent processing.

[0011] Furthermore, the output end of the second motor is connected to the cleaning roller through a belt and a pulley.

[0012] By adopting the above technical solution, the motor can efficiently transmit power to the cleaning roller. When the motor is started, the rotational force it outputs drives the cleaning roller to rotate smoothly and accurately through the cooperation of the belt and the pulley, ensuring the stability and reliability of the cleaning roller during operation, thereby improving the operating efficiency of the entire wood processing equipment.

[0013] Furthermore, the plurality of grinding discs are arranged in an equidistant rectangular array, a first motor is installed on one side of the top of the sliding plate, and an output end of the first motor is connected to the plurality of grinding discs through a transmission belt.

[0014] By adopting the above technical solution, the grinding area becomes more uniform and can effectively cover the entire surface of the wooden board. When the wooden board is transported to the grinding area via the conveyor belt, each grinding disc can finely grind the surface of the wooden board, thereby improving the overall effect and quality of the grinding.

[0015] Furthermore, a swing motor is installed on one side of the sliding plate, and a sliding seat is installed between the sliding plate and the grinder body for causing the sliding plate to perform transverse reciprocating motion.

[0016] By adopting the above technical solution, the sliding plate can obtain additional power to perform specific movements. The activation of the swing motor provides the sliding plate with the necessary driving force, enabling it to perform preset swinging or vibrating movements, which helps to increase the contact area and frequency between the wooden board and the sanding disc during the sanding process, thereby improving the sanding effect.

[0017] Furthermore, the pressing mechanism includes a pressing roller and a fixing frame, the fixing frame is fixedly connected to the grinder body, a slide groove is provided on the inner side of the fixing frame, and both ends of the pressing roller are rotatably connected to the slider through bearings.

[0018] By adopting the above technical solution, a certain pressure is applied to the wooden board as it passes to ensure close contact between the wooden board and the grinding disc, thereby improving the grinding effect. The setting of the pressure roller enables it to flexibly adapt to wooden boards of different thicknesses and materials, ensuring uniformity of grinding.

[0019] Furthermore, the top of the sliding block is rotatably connected to an adjusting screw rod through a thrust bearing, and the adjusting screw rod is threadedly connected to the fixing frame for adjusting the longitudinal height position of the pressure roller.

[0020] By adopting the above technical solution, the adjusting screw can rotate flexibly on the slider while maintaining a stable connection. Due to the characteristics of the thrust bearing, the adjusting screw will not be separated from the slider due to external force during rotation.

[0021] In summary, the present invention has the following beneficial effects:

[0022] The utility model adopts a cleaning mechanism and a dust suction seat, and the surface of the cleaning roller is equipped with a brush. These brushes can effectively contact and remove the debris on the surface of the wooden board during the rotation process. At the same time, in order to further enhance the cleaning effect, the equipment is also equipped with a dust suction seat and a connecting pipe, which are connected to the external negative pressure dust suction device. When the cleaning roller removes the wood chips, the negative pressure dust suction device immediately absorbs the wood chips through the dust suction seat and the connecting pipe. Subsequently, the absorbed wood chips are transported to the dust collecting bag for collection and treatment. This series of operations not only realizes the rapid cleaning of the wood chips on the surface of the wooden board, but also avoids the situation in which the grinding device and the wood chip cleaning device are separated in the traditional technology, thereby ensuring that the debris under the grinding of the wooden board surface can be cleaned in time, reducing the retention time of wood chips on the surface of the wooden board, achieving the continuous operation of the grinding and surface wood chip cleaning processes, and effectively preventing wood chips from flying everywhere, thereby improving the cleanliness of the working environment and the safety protection of the operator;

[0023] 2. The utility model provides a pressure mechanism, and the threaded connection state between the pressure mechanism and the fixing frame can be easily adjusted by twisting the adjusting screw rod. Since the adjusting screw rod is threadedly connected to the fixing frame, the adjusting screw rod will move longitudinally along the threaded track during the twisting process. This movement directly drives the pressure roller connected to the slider for rotation, thereby realizing the precise adjustment of the longitudinal height position of the pressure roller. At the same time, in the process of transporting wooden boards using the conveyor belt, the height-adjustable pressure roller plays an important role. It can be adjusted to a suitable height position according to the actual needs of wooden boards of different thicknesses, and the wooden boards can be stably pressed and transported. This not only ensures the stability of the wooden boards during the grinding process, but also improves the applicability of grinding wooden boards of different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the back structure of the utility model;

[0026] Figure 3 For this utility model Figure 2 A schematic diagram of the structure enlarged in the middle;

[0027] Figure 4 It is a structural diagram of the pressing mechanism of the utility model.

[0028] In the figure: 1. Grinding machine body; 2. Conveyor belt; 3. Slide plate; 4. Grinding disc; 501. First motor; 502. Drive belt; 6. Pressing mechanism; 601. Pressing roller; 602. Fixed frame; 603. Slider; 604. Slide groove; 605. Adjusting screw; 7. Swinging motor; 8. Slide seat; 9. Cleaning mechanism; 901. Cleaning roller; 902. Bearing seat; 903. Second motor; 10. Dust suction seat; 11. Connecting pipe; 12. Wooden board. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The following describes an embodiment of the present invention based on its overall structure.

[0033] Example 1:

[0034] A wood processing equipment that is safe to operate, such as Figures 1-4 As shown, it includes a grinder body 1 and a wooden board 12. A conveyor belt 2 is provided on the inner side of the grinder body 1. Two sets of sliding plates 3 are provided above the conveyor belt 2. A plurality of grinding discs 4 are installed on the bottom surface of the sliding plate 3. A pressing mechanism 6 is provided on one side of the top of the conveyor belt 2. A cleaning mechanism 9 is provided on the other side of the top of the conveyor belt 2. The cleaning mechanism 9 includes a cleaning roller 901. Both ends of the cleaning roller 901 are rotatably connected to the grinder body 1 through a bearing seat 902. A second motor 903 is installed on one side of the grinder body 1. A dust suction seat 10 is installed on the upper side of the cleaning roller 901. A brush is arranged on the surface of the cleaning roller 901. When the brush rotates, the cleaning roller 901 is rotated. During the process, the wood chips remaining on the wooden board 12 after sanding can be effectively swept away, ensuring the preliminary cleaning of the wooden board surface. At the same time, in order to clean the wood chips more thoroughly, the equipment is equipped with a dust suction system. This system includes a dust suction seat 10 and a connecting pipe 11, which are connected to an external negative pressure dust suction device. When the brush on the cleaning roller 901 sweeps away the wood chips, the negative pressure dust suction device generates suction through the dust suction seat 10 and the connecting pipe 11, quickly sucking in the wood chips and transporting them to the dust collecting bag through the pipeline for centralized treatment. This not only achieves the rapid cleaning of wood chips, but also avoids the problem of wood chip scattering caused by the separation of sanding and cleaning steps in traditional technology.

[0035] See Figure 1 、 Figure 2 、 Figure 3 The top of the dust suction seat 10 is connected to the external negative pressure dust suction device and the dust collecting bag through the connecting pipe 11, so that after the wooden board 12 is polished, the wood chips swept by the cleaning roller 901 can be immediately sucked into the dust suction seat 10 and quickly transmitted to the negative pressure dust suction device through the connecting pipe 11. The wood chips will not be retained inside the equipment or scattered in the working area, thereby keeping the working environment clean. At the same time, the connecting pipe 11 also connects the dust suction seat 10 with the dust collecting bag, which means that the sucked wood chips will eventually be collected in the dust collecting bag, which is convenient for subsequent processing and recycling, which not only reduces the pollution of wood chips to the working environment, but also improves the recycling rate of wood chips, which meets the requirements of environmentally friendly production.

[0036] See Figure 1 、 Figure 2 、 Figure 3The surface of the cleaning roller 901 is provided with brushes for cleaning the wood chips generated by grinding the surface of the wooden board 12. When the cleaning roller 901 rotates, these brushes can effectively contact the surface of the wooden board 12 to remove the wood chips generated during the grinding process, ensuring that the wood chips on the surface of the wooden board 12 can be swept away in a timely and thorough manner, thereby improving the cleanliness of the wooden board 12 and the efficiency of subsequent processing. At the same time, the setting of the brushes also enhances the cleaning ability of the cleaning roller 901. Since the brushes are soft and dense, they can penetrate into the tiny gaps of the wooden board 12 and bring out the wood chips that are difficult to remove, which not only improves the cleaning effect, but also reduces the residue of wood chips on the surface of the wooden board 12, providing better conditions for subsequent processing and treatment.

[0037] See Figure 1 、 Figure 2 、 Figure 3 The output end of the second motor 903 is connected to the cleaning roller 901 through a belt and a pulley, so that the motor can efficiently transmit power to the cleaning roller 901. When the motor is started, the rotational force it outputs is coordinated with the belt and the pulley to smoothly and accurately drive the cleaning roller 901 to rotate, ensuring the stability and reliability of the cleaning roller 901 during operation, thereby improving the operating efficiency of the entire wood processing equipment. At the same time, the transmission connection of the belt and the pulley also has certain flexibility and adjustability. In actual application, the tightness of the belt and the pulley can be adjusted as needed to ensure that the cleaning roller 901 obtains an appropriate rotation speed and force, so that the equipment can adapt to the cleaning needs of wooden boards of different materials and thicknesses, thereby improving the versatility and practicality of the equipment.

[0038] See Figure 1 、 Figure 2 , multiple grinding discs 4 are arranged in an equidistant rectangular array, and a first motor 501 is installed on one side of the top of the sliding plate 3, and the output end of the first motor 501 is connected to the multiple grinding discs 4 through a transmission belt 502, so that the grinding area is more uniform and can effectively cover the entire surface of the wooden board 12. When the wooden board 12 is transported to the grinding area through the conveyor belt 2, each grinding disc 4 can perform fine grinding on the surface of the wooden board 12, thereby improving the overall effect and quality of grinding. At the same time, a first motor 501 is installed on one side of the top of the sliding plate 3, and the output end of the first motor 501 is connected to the multiple grinding discs 4 through a transmission belt 502, so that the first motor 501 can drive the multiple grinding discs 4 to rotate at the same time, thereby improving the grinding efficiency. Moreover, due to the connection of the transmission belt 502, the rotation of the grinding disc 4 is more stable and coordinated, further ensuring the uniformity and consistency of grinding.

[0039] See Figure 1 、 Figure 2A swing motor 7 is installed on one side of the sliding plate 3, and a sliding seat 8 is installed between the sliding plate 3 and the grinder body 1, which is used to make the sliding plate 3 perform horizontal reciprocating motion, so that the sliding plate 3 can obtain additional power to perform specific motion. The start-up of the swing motor 7 provides the sliding plate 3 with the necessary driving force, so that it can perform a preset swing or vibration action, which helps to increase the contact area and frequency between the wooden board 12 and the grinding disc 4 during the grinding process, thereby improving the grinding effect. At the same time, a sliding seat 8 is installed between the sliding plate 3 and the grinder body 1, so that the sliding plate 3 can perform horizontal reciprocating motion thereon. This mode of movement not only expands the grinding range of the grinding disc 4 on the wooden board 12, but also makes the grinding process more uniform and delicate.

[0040] Example 2:

[0041] See Figure 1 、 Figure 4 The pressing mechanism 6 includes a pressing roller 601 and a fixing frame 602. The fixing frame 602 is fixedly connected to the grinder body 1. A slide groove 604 is provided on the inner side of the fixing frame 602. Both ends of the pressing roller 601 are rotatably connected to the slider 603 through bearings, and a certain pressure is applied to it when the wooden board 12 passes through to ensure that the wooden board 12 maintains close contact with the grinding disk 4, thereby improving the grinding effect. The setting of the pressing roller 601 enables it to flexibly adapt to wooden boards 12 of different thicknesses and materials, ensuring the uniformity of grinding. At the same time, the fixing frame 602 is fixedly connected to the grinder body 1, providing stable support for the pressing roller 601. The slide groove 604 provided on the inner side of the fixing frame 602 and the two ends of the pressing roller 601 are rotatably connected to the slider 603 through bearings, so that the pressing roller 601 can press the wooden board 12 in the vertical direction.

[0042] See Figure 1 、 Figure 4 The top of the slider 603 is rotatably connected to an adjusting screw rod 605 through a thrust bearing, and the adjusting screw rod 605 is threadedly connected to the fixing frame 602 for adjusting the longitudinal height position of the pressure roller 601, so that the adjusting screw rod 605 can rotate flexibly on the slider 603 while maintaining a stable connection. Due to the characteristics of the thrust bearing, the adjusting screw rod 605 is ensured not to be separated from the slider 603 due to external force during the rotation process. At the same time, a threaded connection is adopted between the adjusting screw rod 605 and the fixing frame 602. This connection method enables the adjusting screw rod 605 to move the slider 603 longitudinally when it rotates. By rotating the adjusting screw rod 605, the longitudinal height position of the pressure roller 601 can be accurately adjusted.

[0043] The implementation principle of the present invention is as follows: first, the wooden board 12 is placed on one side of the top of the conveyor belt 2, and the first motor 501 is started at the same time, and the transmission belt 502 is used to drive multiple grinding discs 4 to rotate. As the conveyor belt 2 continuously transports the wooden board 12, and cooperates with the rotation of the grinding disc 4, the fine grinding of the surface of the wooden board 12 is achieved. At the same time, through the cooperation of the swing motor 7 and the sliding seat 8, the sliding plate 3 is caused to move back and forth horizontally, so as to further improve the grinding accuracy of the surface of the wooden board 12. As the wooden board 12 is gradually transported, until the wooden board 12 is moved out of the grinding area, then, the second motor 903 is used to clean the wooden board 12 through the belt and pulley. The cleaning roller 901 rotates, and the rotation of the cleaning roller 901 cooperates with the brush on the surface to clean the debris on the surface of the wooden board 12. Then, the external negative pressure dust suction device is used to absorb the cleaned wood chips through the dust suction base 10 and the connecting pipe 11 under negative pressure, and the dust collecting bag is used to collect and process the wood chips, thereby achieving rapid cleaning of the wood chips on the surface of the wooden board 12, avoiding the situation in the traditional technology where the grinding device and the wood chip cleaning device are separated, and achieving the effect of timely cleaning the debris on the surface of the wooden board 12. The retention time of the wood chips on the surface of the wooden board 12 is reduced, and the situation where the wood chips are splashed everywhere is avoided, thereby improving the safety protection of the external working environment and the operator.

[0044] By twisting the adjusting screw 605 and utilizing the threaded connection between the adjusting screw 605 and the fixing frame 602, the longitudinal height position of the pressure roller 601 is adjusted. When the wooden board 12 is transported by the conveyor belt 2, the pressure roller 601 with adjustable height can be used to realize the pressure transportation of wooden boards 12 of different thicknesses, thereby improving the stability of the sanding operation of the wooden board 12 and improving the applicability of sanding wooden boards of different thicknesses.

[0045] Parts not involved in the present invention are the same as those in the prior art or can be implemented by using the prior art, and will not be described in detail here.

[0046] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not limitations on the present invention. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and purpose of the present invention, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A wood processing equipment with safe operation, characterized by: The invention comprises a grinding machine body (1) and a wooden board (12); a conveyor belt (2) is provided on the inner side of the grinding machine body (1); two sets of sliding plates (3) are provided above the conveyor belt (2); a plurality of grinding discs (4) are installed on the bottom surface of the sliding plates (3); a pressing mechanism (6) is provided on one side of the top of the conveyor belt (2); a cleaning mechanism (9) is provided on the other side of the top of the conveyor belt (2); the cleaning mechanism (9) comprises a cleaning roller (901); both ends of the cleaning roller (901) are rotatably connected to the grinding machine body (1) through a bearing seat (902); a second motor (903) is installed on one side of the grinding machine body (1); and a dust collecting seat (10) is installed on one side of the cleaning roller (901).

2. The wood processing equipment with safe operation according to claim 1, characterized in that: The top of the dust suction seat (10) is connected to an external negative pressure dust suction device and a dust collecting bag through a connecting pipe (11).

3. The wood processing equipment with safe operation according to claim 1, characterized in that: The surface of the cleaning roller (901) is provided with a brush for cleaning wood chips from the surface of the wooden board (12) during grinding.

4. The wood processing equipment with safe operation according to claim 1, characterized in that: The output end of the second motor (903) is connected to the cleaning roller (901) via a belt and a pulley.

5. The wood processing equipment with safe operation according to claim 1, characterized in that: The plurality of grinding discs (4) are arranged in an equidistant rectangular array, a first motor (501) is installed on one side of the top of the sliding plate (3), and an output end of the first motor (501) is connected to the plurality of grinding discs (4) via a transmission belt (502).

6. The wood processing equipment with safe operation according to claim 1, characterized in that: A swing motor (7) is installed on one side of the sliding plate (3), and a sliding seat (8) is installed between the sliding plate (3) and the grinding machine body (1) for causing the sliding plate (3) to perform transverse reciprocating motion.

7. The wood processing equipment with safe operation according to claim 1, characterized in that: The pressing mechanism (6) comprises a pressing roller (601) and a fixing frame (602). The fixing frame (602) is fixedly connected to the grinding machine body (1). A sliding groove (604) is provided on the inner side of the fixing frame (602). Both ends of the pressing roller (601) are rotatably connected to the slider (603) via bearings.

8. The wood processing equipment with safe operation according to claim 7, characterized in that: The top of the slider (603) is rotatably connected to an adjusting screw rod (605) via a thrust bearing, and the adjusting screw rod (605) is threadedly connected to the fixing frame (602) for adjusting the longitudinal height position of the pressing roller (601).