CN115351630A - A panel grinding device for sofa production and processing - Google Patents

Abstract

The invention discloses a plate grinding device used for sofa production and processing, which belongs to the field of intelligent manufacturing. A plate grinding device for sofa production and processing, comprising: a grinding roller module, at least including a plurality of ring-shaped and uniformly distributed grinding heads, a movable roller core located inside the grinding heads and fixedly connected with the grinding heads and with adjustable diameter , The adjustment assembly embedded in the movable roller core and used to support the movable roller core; the protective cover is set on the outside of the grinding roller module; the induction module is set on the inner side of the protective cover and is used to directly or indirectly obtain the grinding of the plate to be polished amount; and a drive module, which is connected with the adjustment assembly to drive a plurality of grinding heads to rotate, and selectively drives the adjustment assembly to move axially or radially to support the movable roller core to have at least deformation along the radial direction; it can realize the plank After working with the abrasive belt for a long time, reduce the friction between the wood board and the abrasive belt to compensate for the error caused by the thermal expansion of the wood board.

Description

A plate grinding device for sofa production and processing

technical field

The invention belongs to the field of intelligent manufacturing, and more specifically relates to a plate grinding device used for sofa production and processing.

Background technique

Generally, in industry, large-scale wood board grinding requires the use of a belt sander, and the friction between the belt and the board is used to grind off the layer to be polished of the board; but when some hard wood is polished, or the layer to be polished When it is thicker, it often takes a long time to grind the abrasive belt to achieve the desired effect. Long-term grinding of the abrasive belt will increase the amount of sawdust, and at the same time, the abrasive belt and the board will heat up.

The existing patent number is CN202210058646.X, a kind of wood grinding and grinding device, which is designed through the structure of the grinding roller knife to drive the outer knife roller cover to rotate by the inner drive shaft, and can work normally when the knife rotates to grind the wood , when encountering too much sawdust and jamming the knife, the outer clamping part breaks away from the slot, so that the inner drive shaft and the outer knife roller sleeve can produce relative rotation, which prevents the motor from burning out in the event of a knife jamming.

But the above-mentioned device does not solve the problem of heating of the abrasive belt and the wood board; when the abrasive belt and the wood board heat up, the wood board will be heated and expand to form a slight bulge. more, and after the grinding is completed, the surface of the wood board will be uneven after cooling down and returning to its original shape, resulting in the problem of low flatness.

Contents of the invention

The technical problem to be solved by the present invention is to provide a board grinding device for sofa production and processing, which can reduce the friction between the wood board and the abrasive belt after a long time of heating of the wood board and the abrasive belt to compensate for the error caused by the thermal expansion of the wood board.

A kind of plate polishing device used for sofa production and processing of the present invention comprises:

The grinding roller module includes at least a plurality of ring-shaped evenly distributed grinding heads, a movable roller core located inside the grinding head and fixedly connected with the grinding head and adjustable in diameter, embedded in the movable roller core and supporting the movable roller core adjustment components;

The protective cover is arranged on the outside of the grinding roller module;

The sensing module is arranged inside the protective cover and is used to directly or indirectly obtain the grinding amount of the plate to be polished; and

The driving module is connected with the adjustment assembly to drive the rotation of multiple grinding heads, and selectively drives the adjustment assembly to move axially or radially to support the movable roller core to have at least deformation along the radial direction.

As a further improvement of the present invention, the part of the adjustment assembly abutting against the movable roller core has a tapered outer edge; the movable roller core has a tapered inner edge corresponding to the tapered outer edge; the movable roller core is at least made of elastic material So that the movable roller core has at least the ability to deform in the radial direction; the adjustment component and the movable roller core are always in contact with each other, and the movable roller core always maintains a tendency to shrink inward.

As a further improvement of the present invention, the movable roller core includes a plurality of annularly distributed mounting pieces; the mounting pieces are made of rigid materials; elastic membranes are fixedly connected between adjacent two mounting pieces; elastic membranes are made of elastic materials Made so that the movable core has at least the ability to deform in the radial direction.

As a further improvement of the present invention, the adjustment assembly includes an adjustment roller core; the adjustment roller core is made of rigid material, and the outer edge is tapered; the adjustment roller core is embedded in the movable roller core, and the outer edge is in close contact with the inner surface of the mounting piece When the adjustment roll core moves in the axial direction, the elastic film will expand or contract to adjust the outer edge diameter of the active roll core; the width of the adjustable roll core is greater than the width of the active roll core.

As a further improvement of the present invention, the grinding head is fixedly connected to the outer surface of the corresponding mounting piece; a gap is maintained between two adjacent grinding heads; the inner edge of the grinding head is attached to the outer edge of the mounting piece; the outer edge of the grinding head is arc-shaped The outer edges of multiple grinding heads are all located on the same circumference; sandpaper is detachably attached to the outer surface of the grinding head; in a free state, the grinding surface formed by multiple sandpapers is in the shape of a straight cylinder.

As a further improvement of the present invention, the adjustment assembly also includes a rotating shaft and a moving shaft; the rotating shaft is arranged coaxially with the adjusting roller core, one end of the rotating shaft is embedded in one end of the adjusting roller core, and the rotating shaft is connected with the keyway of the adjusting roller core to It can rotate synchronously; the moving shaft is set coaxially with the adjusting roller core, one end of the moving shaft is embedded in the other end of the adjusting roller core, and the moving shaft is freely rotatably connected with the adjusting roller core; synchronous rotation.

As a further improvement of the present invention, at least one slideway is provided in the grinding head; the opening direction of the slideway points to the axis center of the adjusting roller core, and the slideway runs through the outer surface of the grinding head; a slide bar is slidably connected to the slideway The airtight connection of the slideway makes the slideway space on the outside of the slide bar airtight; a spring is fixedly connected between the inner end of the slide bar and the bottom end of the slideway; Attached with sandpaper, the outer opening of the slideway is closed by the tympanic membrane; at least the inner end of the sliding rod is made of magnetic material or magnetic material, and the middle part of the adjusting roller core is provided with an attraction rod with uniform diameter, and at least the outer end of the attraction rod is made of Made of magnetic material, the distance between the outer end surface of the attracting rod and the outer end face of the adjusting roller core in the axial direction changes linearly, and there is a magnetic force between the attracting rod and the sliding rod; in the free state, the opening of the slideway The tympanic membrane is in a convex arc shape, and the magnetic force between the suction rod and the sliding rod is less than or equal to the minimum threshold of spring compression deformation; in the adjusted state, the tympanic membrane at the opening of the slideway is in a concave arc shape, and the magnetic force between the suction rod and the sliding rod is greater than that of the spring The minimum threshold for compression deformation.

As a further improvement of the present invention, the drive module includes a moving motor and a rotating motor; the output shaft of the moving motor has the ability to move in the axial direction, and the output shaft of the moving motor is detachably connected to the end of the moving shaft away from the adjusting roller core, and the moving The motor is detachably arranged outside the protective cover; the output shaft of the rotating motor has the ability to rotate around the axial direction. outside of the shield.

As a further improvement of the present invention, the sensing module includes a controller and a temperature sensor; the temperature sensor is used to feel the temperature on the surface of the sandpaper, and transmits the temperature information to the controller; the controller is electrically connected to the moving motor and the rotating motor independently, The operation of the moving motor and/or the rotating motor is independently controlled; when the temperature exceeds a set threshold, the controller controls the operation of the moving motor to reduce the inner diameter of the active roller core.

As a further improvement of the present invention, the sensing module includes a controller and a visual sensor; the visual sensor is used to sense the amount of sawdust at the place where the board is polished, and transmits the information of the amount of sawdust to the controller; the controller is independently connected to the moving motor and the rotating motor Electrically connected to independently control the operation of the moving motor and/or the rotating motor; when the amount of sawdust exceeds a set threshold, the controller controls the operation of the moving motor to reduce the inner diameter of the active roller core.

Compared with the prior art, the beneficial effects of the present invention are:

In the present invention, by setting a movable roller core with a tapered inner hole and an adjusting roller core with a tapered outer wall, when the adjusting roller core moves axially, the movable roller core will be stretched due to the support of the adjusting roller core or It shrinks by its own elasticity, so as to control the diameter of the grinding surface on the outer side of the grinding head to shrink or expand, and the operation is simple and effective;

In the present invention, the rotating shaft is connected with the keyway of the adjusting roller core, the moving shaft is connected with the adjusting roller core in rotation, the adjusting roller core is connected with the keyway of the movable roller core, and the movable roller core is fixedly connected with the grinding head; after the rotating shaft rotates, it will drive the grinding head to rotate to form Grinding surface, and the moving shaft will not be driven to rotate. When the diameter of the grinding surface needs to be adjusted, the driving moving shaft will move in the axial direction. This operation will not affect the rotating shaft, adjusting roller core, movable roller core, and grinding head. Therefore, the diameter of the grinding surface can be adjusted during grinding, so that the adjustment response of the grinding surface is fast;

In the present invention, when the abrasive belt and/or the wooden board heats up, the thermal expansion of the wooden board will increase the amount of friction with the abrasive belt. At this time, the diameter of the grinding surface is adjusted to reduce the abrasive amount of the wooden board at the thermally expanded area, so as to ensure the quality of the final product. Surface roughness;

When the present invention adjusts the movement of the roller core, the distance between the slide bar and the attraction bar decreases, and the magnetic force between the slide bar and the attraction bar increases until it is greater than the minimum threshold of spring deformation, and the slide bar slides to the inside, while the outside of the slide bar The air pressure in the confined space decreases, and the tympanic membrane at the opening of the slideway is compressed by the external atmospheric pressure to become a concave arc shape, and the abrasive belt connected to the tympanic membrane will also become a concave arc shape, so the abrasive belt here will not touch the wooden board when it touches the wooden board Or reduce the amount of friction with the plank, and finally realize reducing the contact surface between the total grinding surface and the plank at this time, and further reduce the amount of friction with the plank.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the specific embodiment 1 of the present invention;

Fig. 2 is a three-dimensional structural schematic diagram of a grinding roller module according to Embodiment 1 of the present invention;

Fig. 3 is a schematic diagram of the exploded structure of the grinding roller module according to Embodiment 1 of the present invention;

Fig. 4 is a three-dimensional cross-sectional structural schematic diagram of a grinding roller module according to Embodiment 1 of the present invention;

Fig. 5 is another stereoscopic sectional structural schematic diagram of the grinding roller module according to the first embodiment of the present invention;

Fig. 6 is a three-dimensional structural schematic diagram of a movable roller core according to Embodiment 1 of the present invention;

Fig. 7 is a structural schematic diagram of the joint between the adjusting roller core and the moving shaft in Embodiment 1 of the present invention;

Fig. 8 is a schematic plan view of the internal structure of the grinding head according to the second embodiment of the present invention;

Fig. 9 is a schematic perspective view of the three-dimensional cross-sectional structure of the regulating roller core according to the second embodiment of the present invention;

Fig. 10 is a schematic diagram of the shape of the eardrum in a free state according to the second embodiment of the present invention;

Fig. 11 is a schematic diagram of the shape of the eardrum in the adjusted state according to the second embodiment of the present invention.

Explanation of symbols in the figure:

Grinding roller module 1, grinding head 11, slideway 111, tympanic membrane 112, sliding rod 113, spring 114, movable roller core 12, mounting piece 121, elastic film 122, adjusting roller core 13, suction rod 131, rotating shaft 14, moving Shaft 15, shield 2.

Detailed ways

Specific embodiment 1: Please refer to Fig. 1-7 for a plate grinding device for sofa production and processing, including: a grinding roller module 1, a protective cover 2, a sensing module, and a driving module.

The grinding roller module 1 includes at least a plurality of ring-shaped evenly distributed grinding heads 11, a movable roller core 12 that is fixedly connected with the grinding heads 11 and has an adjustable diameter, is embedded in the movable roller core 12, and An adjustment assembly supporting the movable roll core 12;

The movable roller core 12 includes a plurality of annularly distributed mounting pieces 121; the mounting pieces 121 are made of rigid materials; elastic membranes 122 are fixedly connected between adjacent two mounting pieces 121; the elastic membranes 122 are made of elastic materials formed, so that the movable roller core 12 has the ability to deform in the radial direction; the movable roller core 12 surrounded by the mounting piece 121 is tapered, with a tapered inner hole and a tapered outer edge;

The adjustment assembly includes an adjustment roller core 13, a rotating shaft 14 and a moving shaft 15; the adjustment roller core 13 is made of a rigid material, and its outer edge is tapered; the adjustment roller core 13 is embedded in the movable roller core 12, and the outer edge and The inner surface of the sheet 121 is in contact with each other; when the adjusting roller core 13 moves in the axial direction, the elastic film 122 is deformed to expand or contract to adjust the outer edge diameter of the movable roller core 12; the width of the adjusting roller core 13 is larger than that of the movable roller The width of the core 12 can be adjusted so that the roller core 13 can move to the left or right, and the inner diameter of the movable roller core 12 can be adjusted, that is, the movable roller core 12 can be adjusted larger or smaller, and it needs to be explained It is worth noting that, in this application, the elastic film 122 of the movable roller core 12 is always in a state of being stretched, so that the movable roller core 12 always has a tendency to shrink inward, so as to increase the distance between the movable roller core 12 and the adjusting roller core 13. The bonding strength between them can prevent the movable roller core 12 from being expanded and deformed by the centrifugal force when it rotates, which increases the friction between the grinding head 11 and the wood board by mistake;

The rotating shaft 14 is arranged coaxially with the adjusting roller core 13, and one end of the rotating shaft 14 is embedded in the end of one side of the adjusting roller core 13, and the rotating shaft 14 is connected with the keyway of the adjusting roller core 13 so as to be able to rotate synchronously. It should be noted that the The direction of the keyway is consistent with the axis direction of the adjusting roller core 13, wherein the rotating shaft 14 is provided with a plurality of keys near the end of the adjusting roller core 13, and the end of the adjusting roller core 13 near the rotating shaft 14 is provided with a length longer than the rotating shaft. The length of the key of 14 is a cavity, and the inner wall of the cavity is provided with a groove whose length is greater than the length of the key of the rotating shaft 14, so that there is a certain movable range between the adjusting roller core 13 and the rotating shaft 14; the moving shaft 15 Set coaxially with the adjusting roller core 13, one end of the moving shaft 15 is embedded in the other end of the adjusting roller core 13, and the moving shaft 15 is freely rotatably connected with the adjusting roller core 13, specifically, as shown in Figure 7, the adjusting roller core 13 is provided with moving chamber near the end of moving shaft 15, and one end of moving shaft 15 is provided with the chuck that matches with moving chamber inner diameter, and chuck is arranged in moving chamber, and the front and rear sides of chuck and moving chamber are all There are multiple balls, and the outer surface of the chuck is slidingly connected with the inner wall of the moving chamber, so that when the adjusting roller core 13 rotates, the moving shaft 15 will not be driven to rotate; the adjusting roller core 13 is connected to the movable roller core 12 with a keyway In order to be able to rotate synchronously, it should be noted that the direction of the keyway here is consistent with the direction of the generatrix of the adjusting roller core 13; the above-mentioned matching structure can realize that when the rotating shaft 14 rotates, it will drive the adjusting roller core 13 to rotate, and the adjusting roller core 13 will rotate It will drive the movable roller core 12 to rotate, and the moving shaft 15 will not be driven to rotate, but when the moving shaft 15 is pulled forward or pushed backward, the adjusting roller core 13 can be pulled, but it will not affect the movable roller core 12, adjust The rotation of the roller core 13 and the rotating shaft 14; it should be noted that the keyway matching structure between the adjustable roller core 13 and the movable roller core 12 can be clearly expressed in Figure 3, which is a conventional means for those skilled in the art , so it will not be repeated here;

The grinding head 11 is fixedly connected to the outer surface of the corresponding mounting piece 121. In this embodiment, the number of the grinding head 11 and the number of the mounting piece 121 are four. In actual use, the number of the grinding head 11 and the number of the mounting piece 121 As long as the number is more than one, the technical purpose can be achieved; there is always a gap between two adjacent grinding heads 11; the inner edge of the grinding head 11 is attached to the outer edge of the mounting piece 121; the outer edge of the grinding head 11 is arc-shaped, and there are many The outer edges of each grinding head 11 are all located on the same circumference; the outer surface of the grinding head 11 is detachably attached with sandpaper; in a free state, a plurality of sandpapers form a grinding surface and are straight, so that the plank can be polished evenly by the sandpaper.

The protective cover 2 is set on the outside of the grinding roller module 1; the protective cover 2 protects the upper side and the rear side of the grinding roller module 1, and the rear side is the direction that has been polished, because the direction of the splash of sawdust during grinding is backward, so the protection In addition to protecting the grinding roller module 1 from external impact, the cover 2 also avoids the problem of sawdust flying too far.

The drive module includes a moving motor and a rotating motor; the output shaft of the moving motor has the ability to move in the axial direction, the output shaft of the moving motor is detachably connected with the end of the moving shaft 15 away from the adjustment roller core 13, and the moving motor is detachably arranged On the outside of the protective cover 2; the output shaft of the rotating motor has the ability to rotate around the axial direction, the output shaft of the rotating motor is detachably connected to the end of the rotating shaft 14 away from the adjustment roller core 13, and the rotating motor is detachably arranged on the protective cover 2 outside.

The sensing module includes a controller and a temperature sensor; the temperature sensor is used to sense the temperature on the surface of the sandpaper and transmit the temperature information to the controller; the controller is electrically connected to the moving motor and the rotating motor independently to independently control the moving motor and the rotating motor /or rotating motor operation; when the temperature exceeds the set threshold, the controller controls the mobile motor operation to reduce the inner diameter of the movable roller core 12; in the free state, only the rotating motor operates, and the grinding surface is in contact with the surface of the plank to achieve Grinding; when the wood board or sandpaper is overheated, it enters the adjustment state, the rotating motor works as usual, the moving motor starts, and the adjusting roller core 13 is pulled out, so that the movable roller core 12 is deformed inwardly, and the diameter of the grinding surface is reduced, so that the grinding head 11 The friction with the surface of the wood board is reduced, and the thickness of the wood board being polished is reduced, avoiding the problem of uneven surface of the wood board caused by grinding the same thickness after the board is overheated and expanded;

The principle of the temperature sensor feeling the surface temperature of the sandpaper is an existing technology, and it can be realized by referring to the method of using infrared temperature sensing; In addition, it is also possible to set whether the device needs to enter the adjustment mode during the grinding operation by only setting the longest grinding time at the same position without sensing the temperature.

It should be noted that the device is operated at the same level. Referring to the truss line, placing the device on a track that is not in contact with the plank to achieve translation is a common method for those skilled in the art. , will not be described here.

Specific embodiment two: on the basis of specific embodiment one, please refer to Fig. 8-11, there are a plurality of slideways 111 evenly opened in the grinding head 11; The slideway 111 runs through the outer surface of the grinding head 11; the slideway 111 is slidably connected with a slide bar 113, and the slide bar 113 is sealed and connected with the slideway 111 so that the space of the slideway 111 outside the slide bar 113 is airtight; A spring 114 is fixedly connected to the bottom of the slideway 111; an eardrum 112 is detachably attached to the outer surface of the grinding head 11, sandpaper is detachably attached to the outer surface of the eardrum 112, and the outer opening of the slideway 111 is closed by the eardrum 112; At least the inner end of the slide bar 113 is made of a magnetically conductive material, and can also be made of a magnetic material. The middle part of the adjustment roller core 13 is provided with an attracting rod 131 with a uniform diameter, and at least the outer end of the attracting rod 131 is made of a magnetic material. , since the outer edge of the adjustment roller core 13 is conical, and the suction rod 131 is cylindrical, and the distance between the inner end of the grinding head 11 and the outer edge of the adjustment roller core 13 is equal everywhere, then the suction rod 131 is axially The distance between the outer end surface and the outer end surface of the adjusting roller core 13 in the direction changes linearly. It should be noted that the length of the suction rod 131 is greater than the length of the grinding head 11, so that in the adjusted state, the slide rod 113 is always attracted by the suction rod 131. Magnetic force acts, and there is a magnetic force that attracts each other between the attracting rod 131 and the sliding rod 113 . If the inner end of the sliding rod 113 is made of magnetic material, the polarity of the magnetic material on the outer surface of the attracting rod 131 is opposite to that of the magnetic material.

In a free state, the tympanic membrane 112 at the opening of the slideway 111 is in a convex arc shape. At this time, the magnetic force between the attracting rod 131 and the sliding rod 113 is less than or equal to the minimum threshold of compression deformation of the spring 114. The spring 114 is not compressed, and the sliding rod 113 The air pressure in the outer chamber is greater than or equal to the external atmospheric pressure; in the adjusted state, the tympanic membrane 112 at the opening of the slideway 111 is in a concave arc shape, and the magnetic force between the attracting rod 131 and the sliding rod 113 is greater than the minimum threshold of the compression deformation of the spring 114, The slide bar 113 moves downward to compress the compression spring 114, and the air pressure in the chamber outside the slide bar 113 is lower than the external atmospheric pressure; the more the small end of the adjusting roller core 13 moves into the movable roller core 12, the smaller the spring 114 is compressed, and the slide bar 113 The air pressure in the outer chamber is smaller. And when the tympanic membrane 112 is concave arc shape, the tympanic membrane 112 of this part just can not or have reduced the contact pressure with wooden board, has reduced the frictional force of polishing surface and wooden board surface on the whole.

It should be noted that, in the axial direction, the magnetic force at the lower end of the sliding rod 113 at different positions is the same as that of the corresponding attraction rod 131. The means here can be by setting the magnetic force at the lower end of the sliding rod 113 to be different, or by setting the magnetic force at the lower end of the sliding rod 113 to be different. 131 is achieved by setting different magnetic properties in the axial direction, which is a conventional means for those skilled in the art, and will not be repeated here.

Specific embodiment three: on the basis of specific embodiment one or two, the sensing module includes a controller and a visual sensor; the visual sensor is used to feel the amount of sawdust at the polished place of the board, and transmit the information of the amount of sawdust to the controller; the controller The mobile motor and the rotating motor are independently electrically connected to independently control the operation of the mobile motor and/or the rotating motor; when the amount of sawdust exceeds a set threshold, the controller controls the operation of the mobile motor to reduce the movable roller core 12 inner diameter. Compared with the temperature sensor and the time setting method, the setting of the visual sensor is also a way to achieve the technical purpose, and the working principle is consistent with that in the first embodiment.

Specific embodiment 4: On the basis of any one of specific embodiments 1 to 3, balls are provided between the key grooves between the movable roll core 12 and the adjusting roll core 13 to reduce the frictional resistance when the adjusting roll core 13 moves; the same reason A ball is arranged between the keyway between the adjusting roller core 13 and the rotating shaft 14 to reduce the frictional resistance when the adjusting roller core 13 moves.

Claims (10)

1. The utility model provides a panel grinding device for sofa production and processing which characterized in that: the method comprises the following steps:

the grinding roller module (1) at least comprises a plurality of grinding heads (11) which are uniformly distributed in an annular shape, movable roller cores (12) which are positioned on the inner sides of the grinding heads (11), fixedly connected with the grinding heads (11) and adjustable in diameter, and adjusting components which are embedded in the movable roller cores (12) and support the movable roller cores (12);

the protective cover (2) is covered on the outer side of the grinding roller module (1);

the induction module is arranged on the inner side of the protective cover (2) and used for directly or indirectly acquiring the polishing amount of the polished plate; and

and the driving module is connected with the adjusting assembly to drive the plurality of grinding heads (11) to rotate, and selectively drives the adjusting assembly to move along the axial direction or the radial direction so as to support the movable roller core (12) to deform at least along the radial direction.

2. The board grinding device for sofa production and processing according to claim 1, wherein: the part of the adjusting component, which is abutted with the movable roller core (12), is provided with a conical outer edge; the movable roller core (12) is provided with a conical inner edge which is attached to and corresponds to the conical outer edge; the movable roller core (12) is at least made of elastic materials so that the movable roller core (12) has the capability of deforming at least along the radial direction; the adjusting component and the movable roller core (12) are always attached and abutted, and the movable roller core (12) always keeps the trend of inward contraction.

3. The board grinding device for sofa production and processing according to claim 1, wherein: the movable roller core (12) comprises a plurality of mounting sheets (121) which are distributed annularly; the mounting piece (121) is made of a rigid material; elastic membranes (122) are fixedly connected between every two adjacent mounting pieces (121); the elastic membrane (122) is made of elastic material so as to enable the movable roller core (12) to have the capability of deforming at least along the radial direction.

4. The board grinding device for sofa production and processing according to claim 3, wherein: the adjusting assembly comprises an adjusting roller core (13); the adjusting roller core (13) is made of rigid material, and the outer edge of the adjusting roller core is conical; the adjusting roller core (13) is embedded in the movable roller core (12), and the outer edge of the adjusting roller core is abutted with the inner side surface of the mounting piece (121); when the adjusting roller core (13) moves along the axial direction, the elastic membrane (122) generates expansion or contraction deformation so as to adjust the outer edge diameter of the movable roller core (12); the width of the adjusting roller core (13) is larger than that of the movable roller core (12).

5. The board grinding device for sofa production and processing according to claim 4, wherein: the grinding heads (11) are fixedly connected to the outer side surfaces of the corresponding mounting pieces (121); a gap is kept between two adjacent grinding heads (11); the inner edge of the grinding head (11) is attached to the outer edge of the mounting plate (121); the outer edges of the grinding heads (11) are arc-shaped, and the outer edges of the plurality of grinding heads (11) are all positioned on the same circumference; abrasive paper is detachably attached to the outer side surface of the grinding head (11); in a free state, a plurality of abrasive papers form a straight cylindrical polishing surface.

6. The board grinding device for sofa production and processing according to claim 4, wherein: the adjusting assembly further comprises a rotating shaft (14) and a moving shaft (15); the rotating shaft (14) and the adjusting roller core (13) are coaxially arranged, one end of the rotating shaft (14) is embedded in the end part of one side of the adjusting roller core (13), and the rotating shaft (14) is connected with the key groove of the adjusting roller core (13) so as to synchronously rotate; the moving shaft (15) and the adjusting roller core (13) are coaxially arranged, one end of the moving shaft (15) is embedded in the end part of the other end of the adjusting roller core (13), and the moving shaft (15) is freely and rotatably connected with the adjusting roller core (13); the adjusting roller core (13) is in key groove connection with the movable roller core (12) so as to synchronously rotate.

7. The board grinding device for sofa production and processing according to claim 5, wherein: at least one slide way (111) is arranged in the grinding head (11); the opening direction of the slide way (111) points to the axis of the adjusting roller core (13), and the slide way (111) penetrates through the outer side surface of the grinding head (11); a sliding rod (113) is connected in the sliding way (111) in a sliding way, and the sliding rod (113) is connected with the sliding way (111) in a sealing way so as to seal the space of the sliding way (111) at the outer side of the sliding rod (113); a spring (114) is fixedly connected between the inner end of the sliding rod (113) and the bottom end of the slideway (111); a drum membrane (112) is detachably attached to the outer side surface of the grinding head (11), sand paper is detachably attached to the outer side surface of the drum membrane (112), and an opening on the outer side of the slide rail (111) is sealed by the drum membrane (112); at least the inner end of the sliding rod (113) is made of a magnetic conductive material or a magnetic material, the middle of the adjusting roller core (13) is provided with an attraction rod (131) with uniform diameter, at least the outer end of the attraction rod (131) is made of a magnetic material, the distance between the outer end face of the attraction rod (131) and the outer end face of the adjusting roller core (13) in the axial direction changes linearly, and the attraction rod (131) and the sliding rod (113) have mutually attracted magnetic force; in a free state, the tympanic membrane (112) at the opening of the slide way (111) is in a convex arc shape, and the magnetic force between the suction rod (131) and the slide rod (113) is less than or equal to the minimum threshold value of the compression deformation of the spring (114); in the adjusting state, the tympanic membrane (112) at the opening of the slide way (111) is in a concave arc shape, and the magnetic force between the suction rod (131) and the slide rod (113) is larger than the minimum threshold value of the compression deformation of the spring (114).

8. The board grinding device for sofa production and processing according to claim 6, wherein: the driving module comprises a moving motor and a rotating motor; the output shaft of the moving motor has the capability of moving along the axial direction, the output shaft of the moving motor is detachably connected with one end of the moving shaft (15) far away from the adjusting roller core (13), and the moving motor is detachably arranged on the outer side of the protective cover (2); the output shaft of the rotating motor has the capability of rotating around the axial direction, the output shaft of the rotating motor is detachably connected with one end, away from the adjusting roller core (13), of the rotating shaft (14), and the rotating motor is detachably arranged on the outer side of the protective cover (2).

9. The board grinding device for sofa production and processing according to claim 8, wherein: the sensing module comprises a controller and a temperature sensor; the temperature sensor is used for sensing the temperature of the surface of the abrasive paper and transmitting temperature information to the controller; the controller is respectively and independently electrically connected with the moving motor and the rotating motor so as to independently control the moving motor and/or the rotating motor to work; when the temperature exceeds a set threshold, the controller controls the operation of the moving motor to reduce the inner diameter of the movable roller core (12).

10. The board grinding device for sofa production and processing according to claim 8, wherein: the sensing module comprises a controller and a visual sensor; the visual sensor is used for sensing the quantity of the sawdust on the polished part of the plate and transmitting the information of the quantity of the sawdust to the controller; the controller is respectively and independently electrically connected with the moving motor and the rotating motor so as to independently control the moving motor and/or the rotating motor to work; when the amount of the wood chips exceeds a set threshold value, the controller controls the operation of the moving motor to reduce the inner diameter of the movable roller core (12).

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