Four-head grinding machine for floor tiles

Abstract

The floor tile four-head grinding machine comprises a rack, a grinding head mechanism, a driving assembly, a machine box cover and a conveying belt, the conveying belt and the machine box cover are installed on the rack, the lower end of the machine box cover is fixed to the rack, and a containing cavity is formed in the machine box cover; the upper end of the case cover is linked with the driving assembly; the grinding head mechanism comprises a rotating shaft, a shaft sleeve, a grinding disc, a guide key and a first bearing, the rotating shaft is installed in the shaft sleeve in a clearance fit mode, the grinding disc is fixed to the lower end of the rotating shaft, the upper end of the rotating shaft is rotationally connected with the height adjusting mechanism, and the guide key is further installed in the middle of the rotating shaft; the shaft sleeve is rotatably mounted on the top surface of the case cover through a first bearing, the lower part of the shaft sleeve extends downwards into the accommodating cavity, the middle part of the shaft sleeve is provided with an axial long-strip hole corresponding to the position of the guide key, the upper part of the shaft sleeve is linked with the driving assembly, and the length of the long-strip hole is greater than that of the guide key; and the height adjusting mechanism is used for adjusting the height of the rotating shaft. The device has the advantages of compact structure, high working efficiency, low dust and the like.

Description

Technical Field

[0001] The invention relates to the technical field of grinders, in particular to a four-head grinder for floor tiles. Background Art

[0002] After the floor tiles and permeable bricks are formed, the surfaces have burrs and unevenness, and need to be polished. The existing polishing method is to use multiple grinders to polish successively to obtain the finished product.

[0003] Existing patent document 217860387U discloses a grinding device for grinding curbstones, which grinds the side and top sides of the curbstones at the front and rear sections of the conveyor belt respectively. There is no need to manually turn over the curbstones to change the grinding side during the grinding process. The grinding effect is good and the grinding efficiency is improved.

[0004] Existing patent document CN 214080642U discloses a tile grinding device, which provides two grinding mechanisms. Under the action of a control system, the two grinding mechanisms operate simultaneously to grind both sides of the tile at the same time, thereby reducing the number of grinding times of the tile.

[0005] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0006] The (main) purpose of the present invention is to provide a four-head floor tile grinding machine which has a compact structure, high working efficiency, is environmentally friendly and has little dust.

[0007] To this end, the present invention provides a floor tile four-head grinding machine.

[0008] Preferably, the present invention may also have the following technical features:

[0009] A four-head grinding machine for floor tiles, comprising a frame, a grinding head mechanism, a driving assembly, a chassis cover and a conveyor belt, wherein the frame is provided with the conveyor belt and the chassis cover, the lower end of the chassis cover is fixed on the frame, and a receiving cavity is formed inside the chassis cover; the chassis cover is provided with at least one grinding head mechanism, the lower end of the grinding head mechanism extends to a certain distance from the conveyor belt, and the upper end is linked with the driving assembly; further comprising a height adjustment mechanism, the grinding head mechanism comprises a rotating shaft, a sleeve, a grinding disc, a guide key and a first bearing, the rotating shaft is installed in the sleeve through a clearance fit, the lower end of the sleeve is fixed with the grinding disc, the upper end is rotatably connected with the height adjustment mechanism, and the middle part is also provided with the guide key; the sleeve is rotatably installed on the top surface of the chassis cover through the first bearing, the lower part of the sleeve extends downward into the receiving cavity, the middle part is provided with an axial long strip hole corresponding to the position of the guide key, the upper part is linked with the driving assembly, and the length of the long strip hole is greater than the length of the guide key; the height adjustment mechanism is used to adjust the height of the rotating shaft.

[0010] Furthermore, the height adjustment mechanism includes a second bearing seat, a vertical frame, a pulling rod, a cylinder and a horizontal plate. The lower end of the vertical frame is fixed to the upper side of the chassis cover by bolt connection, and the cylinder is installed on the top, and the telescopic rod of the cylinder extends downward; the second bearing seat is fixed to the upper end of the rotating shaft, and a plurality of pulling rods are installed around it; the upper end of the pulling rod is fixed to the horizontal plate in a star shape; the end of the telescopic rod of the cylinder is connected to the middle part of the horizontal plate.

[0011] Furthermore, the height adjustment mechanism also includes a guide screw and a first guide sleeve, the lower end of the first guide sleeve is fixed to the upper side of the horizontal plate, and the upper end extends toward the top of the vertical frame, the guide screw is installed in the first guide sleeve, the lower end of the guide screw passes through the lower side of the horizontal plate and is connected to a lower nut, and the upper end passes through the upper side of the top of the vertical frame and is connected to an upper nut.

[0012] Furthermore, it also includes a spring and a second guide sleeve, the lower end of the second guide sleeve is fixed on the upper side of the transverse plate and is sleeved on the upper part of the guide screw, and the spring is also installed inside the second guide sleeve. The spring is wound around the upper part of the guide screw, and the lower end of the spring abuts against the upper side of the transverse plate, and the upper end extends out of the upper end of the second guide sleeve and abuts against the lower side of the upper nut.

[0013] Furthermore, a lower limit member and an upper limit member are fixed on the extension of the cylinder, wherein the upper limit member is located above the transverse plate, and the lower limit member is located below the transverse plate.

[0014] Furthermore, the distance between the upper limit member and the lower limit member is greater than the thickness of the transverse plate.

[0015] Furthermore, the driving device includes a motor, a main transmission member, and an auxiliary transmission member. The main transmission member is installed on the shaft of the motor, and the main transmission member and the auxiliary transmission member are directly or indirectly linked; the auxiliary transmission member is fixed to the upper part of the sleeve.

[0016] Furthermore, the rotating shaft is provided with a central through hole, and the upper end of the central through hole is connected to a water supply pipe.

[0017] Furthermore, it also includes a positioning guide frame and a second bearing. The positioning guide frame is also arranged between the first bearing and the chassis cover. The upper part of the positioning guide frame is provided with a first axial hole for mounting the first bearing and is fixed to the top surface of the chassis cover by bolts, and the lower part is provided with a second axial hole for mounting the second bearing; the inner ring of the second bearing and the lower outer side of the sleeve are interference fit.

[0018] Furthermore, it also includes a limiting mechanism, which includes a front stopper, a rear stopper, a first connecting plate and a second connecting plate, the front stopper and the rear stopper are spaced a certain distance apart, the first connecting plates are respectively installed at both ends of the front stopper, and the upper ends of the first connecting plates are fixed to the chassis cover by bolts; the second connecting plates are respectively installed at both ends of the rear stopper, and the upper ends of the second connecting plates are fixed to the chassis cover by bolts.

[0019] The beneficial effects of the present invention compared with the prior art include:

[0020] (1) The drive assembly drives the sleeve to rotate. Under the action of the first bearing, the sleeve and the chassis cover rotate relative to each other. Under the action of the guide key, the sleeve drives the shaft to rotate, and then drives the grinding disc to rotate and grind the floor tiles. When in use, the height adjustment mechanism pulls the shaft up and down to control the distance between the grinding disc and the conveyor belt to adapt to the height of different floor tiles and adjust the grinding thickness.

[0021] (2) The inner ring of the second bearing seat and the rotating shaft are interference fit. In this way, when the rotating shaft rotates, the pull rod, cross plate and cylinder are in a stationary state through the action of the second bearing seat, and will not rotate with the rotating shaft, thereby avoiding interference with the rotation of the rotating shaft.

[0022] (3) The cylinder is used to adjust the moving distance of the cutter disc by large displacement, and then the upper nut is used to fine-tune the moving distance of the cutter disc, so as to quickly and accurately adjust the cutter disc into place.

[0023] (4) The water supply pipe and the central perforation form a cooling water channel. The cooling water flows through the water supply pipe and the central perforation to the upper side of the polished floor tile, and spreads from the middle of the floor tile to the surrounding area to cool the surface of the floor tile, while also reducing dust generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 and Figure 2It is a cross-sectional structural schematic diagram of the present invention.

[0025] Figure 3 and Figure 4 It is a schematic diagram of the installation of the grinding head mechanism of the present invention.

[0026] Figure 5 and Figure 6 It is a schematic diagram of the installation of the height adjustment mechanism of the present invention.

[0027] Figure 7 It is a schematic diagram of the shaft sleeve structure of the present invention.

[0028] Figure 8 It is a perspective view of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with specific implementations and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its application.

[0030] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein like reference numerals refer to like parts unless otherwise specifically stated.

[0031] like Figures 1 to 8A four-head floor tile grinding machine shown in the figure comprises a frame 1, a grinding head mechanism, a driving assembly, a chassis cover 2 and a conveyor belt 3. The conveyor belt 3 and the chassis cover 2 are installed on the frame 1. The lower end of the chassis cover 2 is fixed on the frame 1, and a receiving cavity 23 is formed inside the chassis cover 2. The conveying direction of the conveyor belt 3 extends along the length direction of the frame 1 and crosses the two ends of the chassis cover 2. The chassis cover 2 is installed with at least one grinding head mechanism, the lower end of which extends to a certain distance from the conveyor belt 3, and the upper end is linked to the driving assembly. As an improvement, it also includes a height adjustment mechanism, the grinding head mechanism includes a rotating shaft 75, a sleeve 74, a grinding disc 71, a guide key 77 and a first bearing 64, the rotating shaft 75 is installed in the sleeve 74 through a clearance fit, the grinding disc 71 is fixed at its lower end, the upper end is rotatably connected to the height adjustment mechanism, and the guide key 77 is installed in the middle; the sleeve 74 is rotatably installed on the top surface of the chassis cover 2 through the first bearing 64, the lower part of which extends downward into the accommodating cavity 23, an axial long hole 61 corresponding to the position of the guide key 77 is opened in the middle, the upper part is linked to the driving assembly, and the length of the long hole 61 is greater than the length of the guide key 77, after the rotating shaft 75 and the sleeve 74 are installed, the rotating shaft 75 cannot rotate relative to the sleeve 74, but can be telescopically moved along the axial direction of the sleeve 74 for a certain distance, that is, the long hole 61 is used as a guide, and the guide key 77 slides within the guide stroke of the long hole 61. In this way, the shaft sleeve 74 is driven to rotate by the driving assembly. Under the action of the first bearing 64, the shaft sleeve 74 and the chassis cover 2 rotate relatively. Under the action of the guide key 77, the shaft sleeve 74 drives the rotating shaft 75 to rotate, and then drives the grinding disc 71 to rotate and grind the floor tiles. When in use, the rotating shaft 75 is pulled up and down by the height adjustment mechanism to control the spacing between the grinding disc 71 and the conveyor belt 3 to adapt to the height of different floor tiles and adjust the grinding thickness. Preferably, the rotating shaft 75 is provided with an axial keyway, and the bottom of the keyway is provided with a screw hole for connecting the guide key 77, and the guide key 77 is fixed to the rotating shaft by bolts. Preferably, two symmetrical axial keyways are provided on the outer side of the rotating shaft 72, and the guide key 77 is installed. After the guide key 77 is assembled in place, its end face is flush with the outer side of the shaft sleeve 74.

[0032] Combination Figure 5-6The height adjustment mechanism includes a second bearing seat 73, a stand 46, a pull rod 45, a cylinder 43 and a cross plate 47. The lower end of the stand 46 is fixed to the upper side of the chassis cover 2 by bolt connection, and the cylinder 43 is installed on the top. The telescopic rod 431 of the cylinder 43 extends downward. The second bearing seat 73 is fixed to the upper end of the rotating shaft 75, and 3-4 pull rods 45 are installed around it. The upper ends of the pull rods 45 are fixed to the cross plate 47 in a star shape. The end of the cylinder telescopic rod is connected to the middle of the cross plate 74. In this embodiment, the inner ring of the bearing of the second bearing seat 73 and the rotating shaft 75 are interference fit. In this way, when the rotating shaft 75 rotates, through the action of the second bearing seat 73, the pull rod 45, the cross plate 47 and the cylinder 43 are in a stationary state, and will not rotate with the rotating shaft 75, so as to avoid interfering with the rotation of the rotating shaft 75. Preferably, it also includes a limiter, which is used to limit the axial movement of the second bearing seat 73. Specifically, the upper end of the rotating shaft 75 is a reduced stepped shaft body, which is limited by the limiting surface formed by the stepped shaft body to the lower side of the second bearing seat 73, and the upper end of the stepped shaft body is provided with the limiting member to limit the upward movement of the second bearing seat 73. Preferably, the limiting member is a nut 72, which is threadedly connected to the stepped shaft body.

[0033] In the above, the height adjustment mechanism further includes a guide screw 44 and a first guide sleeve 48. The lower end of the first guide sleeve 48 is fixed to the upper side of the horizontal plate 47, and the upper end extends to the top of the vertical frame 46. The guide screw 44 is installed in the first guide sleeve 48, and its lower end passes through the lower side of the horizontal plate 47 and is connected to the lower nut, and its upper end passes through the upper side of the top of the vertical frame 46 and is connected to the upper nut 41. Preferably, it also includes a spring 42 and a second guide sleeve (model not shown). The lower end of the second guide sleeve is fixed to the upper side of the horizontal plate 47 and covers the upper part of the guide screw 44. The spring 42 is also installed inside the second guide sleeve. The spring 42 is wound around the upper part of the guide screw 44, and its lower end abuts against the upper side of the horizontal plate 47, and the upper end extends out of the upper end of the second guide sleeve. Preferably, the upper end of the spring 42 abuts against the lower side of the upper nut 41. The cooperation of the guide screw 44 and the second guide sleeve improves the stability and reliability of the telescopic displacement of the cylinder, and reduces the impact force on the telescopic rod of the cylinder during the grinding process. The spring 42 can play a buffering role and reduce the vibration of the upper nut 41.

[0034] More specifically, the cylinder 43 can be replaced with a structure that can drive the shaft to move up and down, such as an oil cylinder. A center hole is opened in the middle of the cross plate 47, and the telescopic rod of the cylinder 43 passes through the center hole and passes through the lower side of the cross plate 47. The telescopic part of the cylinder 43 is also fixed with a lower limit member (not shown in the model) and an upper limit member 49, wherein the upper limit member 49 is located above the cross plate 47, and the lower limit member is located below the cross plate 47. Preferably, the spacing between the upper limit member 49 and the lower limit member is greater than the thickness of the cross plate 47, so that under normal conditions, the lower side of the cross plate 47 abuts against the lower limit member, and the upper side of the cross plate 47 and the upper limit member 49 have a certain distance, which is 3 to 10 mm. Preferably, the upper limit member 49 and the lower limit member are installed on the telescopic rod of the cylinder by bolt connection. When adjusting the distance between the cutter disc 71 and the conveyor belt 3, the air cylinder 43 is first controlled to descend a certain distance, and then the distance between the cutter disc 71 and the conveyor belt 3 is further adjusted by adjusting the upper nut 41 installed on the guide screw 44; then the telescopic rod of the air cylinder 43 is driven downward to make the upper limit member 49 abut against the horizontal plate 47, and a certain pressure is applied to the horizontal plate 47. The moving distance of the cutter disc 71 is adjusted by the large displacement of the air cylinder 43, and then the moving distance of the cutter disc 71 is finely adjusted by the upper nut 41, so that the cutter disc 71 can be adjusted to the right position quickly and accurately.

[0035] In another embodiment of the height adjustment mechanism, the upper limit member 49 can be adjusted to abut against the upper side of the horizontal plate 47, and the lower limit member 491 can abut against the upper side of the horizontal plate 47. In this way, the horizontal plate 47 is sandwiched between the upper limit member 49 and the lower limit member 491, so that the horizontal plate 47 moves up and down synchronously with the telescopic rod of the cylinder 43. At this time, the guide screw rod cooperates with the upper nut 41 to only adjust the lowest limit of the downward movement of the telescopic rod of the cylinder 43.

[0036] Preferably, the stand 46 is a saddle card structure. In this way, when connecting parts such as the cylinder 43, the pull rod 45, the second bearing seat 73, etc., it is easy to operate.

[0037] The driving device includes a motor 5, a main pulley, a secondary pulley 51, a belt, and a belt box 52. The front end of the belt box 52 is installed between the chassis cover 2 and the stand 46, and the lower side is fixed to the chassis cover 2 by bolts, and the upper side is connected to the stand 46; the rear end is installed with the motor 5. The shaft of the motor 5 extends into the belt box 52, and the main pulley is installed on the motor shaft. The secondary pulley 51 is installed on the upper part of the sleeve 74 by bolts and is linked with the sleeve 74. The belt is tensioned on the main pulley and the secondary pulley 74, thereby linking the main pulley and the secondary pulley 74. Specifically, the upper part of the sleeve 74 extends out of the upper side of the first bearing 64, and is provided with a flange surface to connect the secondary pulley 51. The secondary pulley 51 is provided with a plurality of axial connection holes, and the bolts 511 pass through the connection holes and are tightened on the sleeve 74. In this embodiment, the transmission to the shaft sleeve is carried out through the belt, the main pulley and the auxiliary pulley 51, so as to avoid the motor 5 interfering with the installation of the height adjustment mechanism and to allow sufficient assembly space. Optionally, the main pulley and the auxiliary pulley 51 can also be replaced by a chain transmission of a similar form, or replaced by two gear transmissions to transmit force to the shaft sleeve 74.

[0038] Preferably, the rotating shaft 75 is provided with a central through hole 76, and the upper end of the central through hole 76 is connected to a water supply pipe 78. During grinding, the water supply pipe 78 and the central through hole 76 form a cooling water channel, and the cooling water is poured onto the upper side of the floor tile being grinded through the water supply pipe 78 and the central through hole 76, and spreads from the middle of the floor tile to the surrounding to cool the surface of the floor tile, while also reducing dust generation. Furthermore, it also includes a water inlet hopper 79, which is funnel-shaped, and its lower end is threadedly connected to the upper end of the central through hole 76, and the water outlet of the water supply pipe 78 extends to the top of the water inlet hopper 79 and faces the water inlet hopper 79 below.

[0039] One embodiment of strengthening the guide of the sleeve 74 further includes a positioning guide frame 6 and a second bearing 65. The positioning guide frame 6 is further provided between the first bearing 64 and the chassis cover 2. The upper portion of the positioning guide frame 6 is provided with a first axial hole for installing the first bearing 64 and is fixed to the top surface of the chassis cover 2 by bolts. The lower portion is provided with a second axial hole for installing the second bearing 65. The inner ring of the second bearing 65 is interference-fitted with the lower outer side of the sleeve 74. In this way, the first bearing 64 and the second bearing 65 are respectively installed by providing two axial holes on the positioning guide frame 6, thereby strengthening the guiding effect of the sleeve 74 on the rotating shaft 75.

[0040] In a further embodiment, an upper sealing plate 62 and a lower sealing plate 66 are further included, and the upper sealing plate 62 and the lower sealing plate 66 are used for sealing to prevent grinding dust and water mist from entering the first bearing 64 and the second bearing 65, which affect the service life of the bearings. Among them, the middle part of the upper sealing plate 62 is provided with a first center hole that is clearance-matched with the sleeve 74, and a plurality of first connecting holes for connecting the positioning guide frame 6 are also provided around it, and it is fixed to the upper side of the positioning guide frame 6 by bolts to achieve a sealing effect. The middle part of the lower sealing plate 66 is provided with a second center hole that is clearance-matched with the sleeve 74, and a plurality of second connecting holes for connecting the positioning guide frame 6 are also provided around it, and it is fixed to the lower side of the positioning guide frame 6 by bolts to achieve a sealing effect. Preferably, a guide boss is extended from the lower side of the second center hole, and the second center hole extends downward and passes through the guide boss, lengthening the length of the second center hole, increasing the sealing surface, and improving the sealing effect. Since the lower sealing plate 66 is close to the grinding disc 71, dust and water mist are dense, it is necessary to arrange a sealing mechanism with a better sealing effect. Preferably, it further comprises an upper sealing ring 63 and a lower sealing ring 67, wherein the upper sealing ring 63 is installed at the upper end of the first center hole; and the lower sealing ring 67 is installed at the lower end of the second center hole.

[0041] Preferably, in order to improve the grinding efficiency, four grinding head mechanisms are provided, and each grinding head mechanism is powered by a driving assembly. The accommodating cavity 23 is divided into four small spaces by a partition 21, and each small space is equipped with a grinding head mechanism. The distance between the grinding disc of each grinding head mechanism and the conveyor belt 3 is different, wherein the grinding head mechanism close to the feed end of the conveyor belt 3 is the first grinding head mechanism 10, and the other grinding head mechanisms are the second grinding head mechanism 20, the third grinding head mechanism 30, and the fourth grinding head mechanism 40. Moreover, the distance between the grinding disc of the first grinding head mechanism 10 and the conveyor belt 3 is the largest, and the distance between the grinding discs of the other three grinding head mechanisms and the conveyor belt 3 decreases successively, thereby achieving rough grinding to step-by-step fine grinding until the finished product is obtained. In this way, one set of equipment can complete the grinding work of floor tiles, and there is no need to move floor tiles back and forth, with high work efficiency and low labor intensity.

[0042] As an adjustable variation, the distances between the grinding discs of the four grinding head mechanisms and the conveyor belt 3 can be adjusted to be the same, and flexible adjustments can be made according to production requirements.

[0043] Combination Figure 7, and also includes a limiting mechanism, the limiting mechanism includes a front stopper 82, a rear stopper 81, a first connecting plate and a second connecting plate, the front stopper 82 and the rear stopper 81 are spaced a certain distance apart, the first connecting plates are respectively installed at both ends of the front stopper 82, the upper ends of the first connecting plates are fixed to the two ends of the chassis cover 2 by bolts, and the front stopper and the conveyor belt 3 are spaced apart. The second connecting plates 83 are respectively installed at both ends of the rear stopper 81, and the upper ends of the second connecting plates 83 are fixed to the two ends of the chassis cover 2 by bolts. Preferably, the chassis cover 2 is provided with a plurality of first longitudinal long holes connecting the first connecting plate and the second connecting plate 83 in the front-to-back direction, so that the spacing between the first connecting plate and the second connecting plate 83 can be adjusted, so that the front stopper 82 and the rear stopper 81 can clamp floor tiles of different sizes. During operation, the distance between the front stopper 82 and the rear stopper 81 is adjusted according to the size of the floor tile, so that the front stopper 82 abuts against the front side of the floor tile, and the rear stopper 81 abuts against the rear side of the floor tile, to prevent the floor tile from jumping during the grinding process. Furthermore, the partition 21 is provided with a second longitudinal strip hole corresponding to the position of the first longitudinal strip hole, and the first connecting plate and the second connecting plate 83 are installed at the corresponding positions of the front stopper 82 and the rear stopper 81, and the upper ends of the first connecting plate and the second connecting plate 83 are connected to the corresponding second longitudinal strip hole, so as to strengthen the rigidity of the front stopper 82 and the rear stopper 81 and prevent deformation during the grinding process.

[0044] Those skilled in the art will appreciate that numerous variations to the above description are possible, and that the examples and figures are intended only to describe one or more specific implementations.

[0045] Although what is considered as exemplary embodiments of the present invention has been described and described, it will be understood by those skilled in the art that various changes and substitutions may be made thereto without departing from the spirit of the present invention. In addition, many modifications may be made to adapt specific situations to the teachings of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but the present invention may also include all embodiments and their equivalents that fall within the scope of the present invention.

Claims

1. A four-head floor tile grinder, comprising a frame, a grinding head mechanism, a driving assembly, a chassis cover and a conveyor belt, wherein the frame is equipped with the conveyor belt and the chassis cover, the lower end of the chassis cover is fixed to the frame, and a receiving cavity is formed inside the chassis cover; the chassis cover is equipped with at least one grinding head mechanism, the lower end of the grinding head mechanism extends to a certain distance from the conveyor belt, and the upper end is linked to the driving assembly; characterized in that: It also includes a height adjustment mechanism, the grinding head mechanism includes a rotating shaft, a sleeve, a grinding disc, a guide key and a first bearing, the rotating shaft is installed in the sleeve through clearance fit, the grinding disc is fixed at its lower end, the upper end is rotatably connected to the height adjustment mechanism, and the guide key is also installed in the middle; the sleeve is rotatably installed on the top surface of the chassis cover through the first bearing, the lower part of the sleeve extends downward into the accommodating cavity, an axial long hole corresponding to the position of the guide key is opened in the middle part, the upper part is linked to the driving assembly, and the length of the long hole is greater than the length of the guide key; the height adjustment mechanism is used to adjust the height of the rotating shaft.

2. A floor tile four-head grinding machine as claimed in claim 1, characterized in that: The height adjustment mechanism includes a second bearing seat, a vertical frame, a pulling rod, a cylinder and a horizontal plate. The lower end of the vertical frame is fixed to the upper side of the chassis cover by bolt connection, and the cylinder is installed on the top, and the telescopic rod of the cylinder extends downward; the second bearing seat is fixed to the upper end of the rotating shaft, and a plurality of pulling rods are installed around it; the upper end of the pulling rod is fixed to the horizontal plate in a star shape; the end of the telescopic rod of the cylinder is connected to the middle part of the horizontal plate.

3. A four-head floor tile grinding machine as claimed in claim 2, characterized in that: The height adjustment mechanism also includes a guide screw and a first guide sleeve. The lower end of the first guide sleeve is fixed to the upper side of the horizontal plate, and the upper end extends toward the top of the vertical frame. The guide screw is installed in the first guide sleeve, and its lower end passes through the lower side of the horizontal plate and is connected to a lower nut, and its upper end passes through the upper side of the top of the vertical frame and is connected to an upper nut.

4. A floor tile four-head grinding machine as claimed in claim 3, characterized in that: It also includes a spring and a second guide sleeve, the lower end of the second guide sleeve is fixed on the upper side of the transverse plate and is sleeved on the upper part of the guide screw, and the spring is also installed inside the second guide sleeve. The spring is wound around the upper part of the guide screw, and the lower end of the spring abuts against the upper side of the transverse plate, and the upper end extends out of the upper end of the second guide sleeve and abuts against the lower side of the upper nut.

5. A floor tile four-head grinding machine as claimed in claim 2, characterized in that: A lower limit piece and an upper limit piece are also fixed on the extension of the cylinder, wherein the upper limit piece is located above the transverse plate, and the lower limit piece is located below the transverse plate.

6. A floor tile four-head grinding machine as claimed in claim 5, characterized in that: The distance between the upper limit member and the lower limit member is greater than the thickness of the transverse plate.

7. A floor tile four-head grinding machine as claimed in claim 1, characterized in that: The driving device comprises a motor, a main transmission member and an auxiliary transmission member. The main transmission member is mounted on the shaft of the motor. The main transmission member and the auxiliary transmission member are directly or indirectly linked. The auxiliary transmission member is fixed on the upper part of the shaft sleeve.

8. A floor tile four-head grinding machine according to any one of claims 1 to 7, characterized in that: The rotating shaft is provided with a central through hole, and the upper end of the central through hole is connected to a water supply pipe.

9. A floor tile four-head grinding machine as claimed in claim 1, characterized in that: It also includes a positioning guide frame and a second bearing. The positioning guide frame is also arranged between the first bearing and the chassis cover. The upper part of the positioning guide frame is provided with a first axial hole for mounting the first bearing and is fixed to the top surface of the chassis cover by bolts, and the lower part is provided with a second axial hole for mounting the second bearing; the inner ring of the second bearing and the lower outer side of the sleeve are interference fit.

10. A floor tile four-head grinding machine as claimed in claim 1, characterized in that: It also includes a limiting mechanism, which includes a front stopper, a rear stopper, a first connecting plate and a second connecting plate. The front stopper and the rear stopper are spaced a certain distance apart. The first connecting plates are respectively installed at both ends of the front stopper, and the upper ends of the first connecting plates are fixed to the chassis cover by bolts; the second connecting plates are respectively installed at both ends of the rear stopper, and the upper ends of the second connecting plates are fixed to the chassis cover by bolts.

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