Multi-station sanding machine

Abstract

The utility model belongs to the technical field of sanding equipment, and particularly relates to a multi-station sanding machine which comprises a machine base, a longitudinal feeding mechanism, a transverse feeding mechanism, at least two sanding mechanisms and a rotating mechanism, the longitudinal feeding mechanism and the transverse feeding mechanism are arranged, so that the at least two sanding mechanisms share the same XY feeding system, and the sanding efficiency is improved. Synchronous movement and cooperative work of the at least two sanding mechanisms are realized, so that a plurality of workpieces can be simultaneously and synchronously polished, the machining efficiency is greatly improved, the feeding error between the sanding mechanisms is reduced, the consistency of the machined workpieces is good, the number and occupied space of equipment are reduced, and the production cost is reduced. And a plurality of sanding machines can be combined according to actual process requirements, so that the processing requirements of different products are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to sanding equipment technical field, concretely is a multi-station sanding machine. BACKGROUND

[0002] The manufacturing of kitchen utensils such as pots usually adopts sheet metal drawing stamping forming process, in the production process, in order to obtain the surface quality of flat smooth, need to carry out sanding polishing treatment to the inner and outer surface of the pot, and the existing sanding equipment is generally equipped with only a vertical sanding mechanism, can only process single pot each time, lead to low working efficiency, when facing the batch production demand, especially need to polish two or more pots simultaneously, then want to configure multiple sanding equipment, and each increase a sanding equipment, will bring additional cost investment, and need to occupy more space, therefore, for the low efficiency problem of existing sanding equipment, urgently need to develop a kind of high-efficiency sanding equipment capable of simultaneously processing multiple pots, to improve production efficiency, reduce cost, and optimize space utilization. SUMMARY

[0003] The utility model aims at overcoming the deficiency that the existing sanding equipment can only polish one workpiece each time, and provides a sanding equipment capable of polishing multiple workpieces simultaneously to improve working efficiency.

[0004] To solve the above technical problem, the utility model adopts the following technical scheme:

[0005] A multi-station sanding machine, including base and the longitudinal feed mechanism, transverse feed mechanism, at least two sanding mechanisms, at least two rotating mechanisms being set on the base, longitudinal feed mechanism is equipped with the longitudinal base that can move longitudinally, transverse feed mechanism is set in the longitudinal base and is driven longitudinally by longitudinal feed mechanism, the transverse feed mechanism is equipped with the transverse pedestal that can move transversely, at least two sanding mechanisms are transversely arranged in the transverse pedestal, at least two sanding mechanisms can be driven synchronously by longitudinal feed mechanism and / or transverse feed mechanism, at least two rotating mechanisms are transversely arranged below at least two sanding mechanisms, each rotating mechanism is equipped with the jig that can rotate, and the jig is used to fix workpiece and drive workpiece rotation.

[0006] Compared with the prior art, the multi-station sanding machine has the longitudinal feeding mechanism and the transverse feeding mechanism, at least two sanding mechanisms share the same XY feeding system, synchronous movement and cooperative work of the at least two sanding mechanisms are realized, multiple workpieces can be polished simultaneously and synchronously, the processing efficiency is greatly improved, the feeding errors between the sanding mechanisms are reduced, the consistency of the processed workpieces is good, the number of equipment and the occupied space are reduced, and multiple sanding machines can be combined according to actual process requirements, so that the processing requirements of different products are met.

[0007] Further, the longitudinal feeding mechanism comprises a longitudinally arranged longitudinal screw rod, longitudinal guide columns arranged on both sides of the longitudinal screw rod, a first motor for driving the longitudinal screw rod to rotate, a first nut seat threadedly connected to the longitudinal screw rod, and a first slide seat slidably arranged on the longitudinal guide column and fixedly connected to the longitudinal base. The above arrangement can realize accurate movement of the longitudinal base, thereby ensuring stable movement of the sanding mechanism in the longitudinal direction and improving the processing precision.

[0008] Further, the transverse feeding mechanism comprises a transversely arranged transverse screw rod, transverse guide columns arranged on both sides of the transverse screw rod, a second motor for driving the transverse screw rod to rotate, a second nut seat threadedly connected to the transverse screw rod, and a second slide seat slidably arranged on the transverse guide column and fixedly connected to the transverse base. The above arrangement can realize accurate movement of the transverse base, thereby ensuring stable movement of the sanding mechanism in the transverse direction and further improving the processing precision.

[0009] Further, the sanding mechanism comprises a sanding base plate, a feeding disc arranged on the sanding base plate, a collecting disc, a sanding arm arranged between the feeding disc and the collecting disc, a sand belt, and a feeding mechanism. The sanding arm is provided with a sanding head extending below the sanding base plate. One end of the sand belt is wound on the feeding disc, and the other end is wound on the collecting disc after passing through the sanding arm. The feeding mechanism is used for pulling the sand belt to realize feeding of the feeding disc. The above arrangement can realize automatic replacement and tension adjustment of the sand belt, thereby ensuring continuity and stability of the sanding process and improving the processing efficiency.

[0010] Further, the feeding mechanism comprises a driving wheel arranged on one side of the sanding base plate, a driven wheel arranged on the other side of the sand belt, and a belt changing motor. The driving wheel can be driven to rotate by the belt changing motor to pull the sand belt. The above arrangement can realize automatic replacement of the sand belt, thereby ensuring continuity and stability of the sanding process and further improving the processing efficiency.

[0011] Further, the detection mechanism is arranged between the receiving disc and the abrasive belt, and includes a detection wheel, a detection driving device for driving the detection wheel to abut against the surface of the abrasive belt, and a sensor for detecting the active stroke of the detection wheel. The stroke of the detection wheel can be used to determine whether the abrasive belt is broken. Specifically, when the abrasive belt is intact, the movement of the detection wheel is hindered by the abrasive belt, so that the stroke of the detection wheel is reduced, thereby determining that the abrasive belt is intact. When the abrasive belt is broken, the detection wheel is not hindered by the abrasive belt, so that the stroke of the detection wheel is increased, thereby determining that the abrasive belt is broken.

[0012] Further, the rotating mechanism includes a driving cylinder with an output direction perpendicular to the longitudinal frame, first guide columns arranged on both sides of the driving cylinder, a mounting seat connected with the output end of the driving cylinder, a rotating driving device arranged on the mounting seat, a rotating shaft driven to rotate by the rotating driving device and arranged in parallel to the longitudinal frame, and a jig arranged on the upper end of the rotating shaft. The first guide columns are slidably provided with third sliding seats fixedly connected with the mounting seat. The above arrangement can realize stable rotation of the workpiece, thereby ensuring uniformity and consistency of the sanding process, improving the processing quality. The driving cylinder can be used to adjust the jig in a direction perpendicular to the longitudinal frame, facilitating feeding and discharging of the workpiece.

[0013] Further, the dust cover is arranged on the frame, and is configured with a sanding operation port on the upper side for the sanding arm to enter, a jig entrance port for the jig to enter, and an avoidance gap for the rotating shaft to pass through. The above arrangement can effectively reduce the influence of dust generated during sanding on the environment and the operator. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a perspective view of the multi-station sanding machine;

[0015] Figure 2 It is an exploded view of the multi-station sanding machine;

[0016] Figure 3 It is an exploded view of the longitudinal feeding mechanism;

[0017] Figure 4 It is a structural schematic view of the transverse feeding mechanism;

[0018] Figure 5 It is a structural schematic view of the constant pressure mechanism;

[0019] Figure 6 It is an exploded view of the constant pressure mechanism;

[0020] Figure 7 And Figure 8 It is a structural schematic view of the sanding mechanism;

[0021] Figure 9 is a schematic view of a rotating mechanism;

[0022] Figure 10 is a sectional view of a rotating mechanism, wherein the dashed line represents a driving cylinder. DETAILED DESCRIPTION

[0023] A preferred embodiment of the present application is described below in conjunction with the accompanying drawings.

[0024] Referring to Figures 1 to 4 , the present embodiment provides a multi-station sanding machine, which comprises a base 1, a longitudinal feeding mechanism 2, a transverse feeding mechanism 3, at least two sanding mechanisms 4, and at least two rotating mechanisms 5 arranged on the base 1. The longitudinal feeding mechanism 2 is configured with a longitudinally movable longitudinal base 26. The transverse feeding mechanism 3 is arranged on the longitudinal base 26 and is driven by the longitudinal feeding mechanism 2 to move longitudinally. The transverse feeding mechanism 3 is configured with a transversely movable transverse base 31. The at least two sanding mechanisms 4 are arranged transversely on the transverse base 31 and can be driven by the longitudinal feeding mechanism 2 and / or the transverse feeding mechanism 3 to move synchronously. The at least two rotating mechanisms 5 are arranged transversely below the at least two sanding mechanisms 4. Each rotating mechanism 5 is configured with a rotatable jig 51 for fixing and rotating a workpiece. In a specific embodiment, as shown in Figure 1 , the sanding mechanism 4 of the present embodiment is provided with two.

[0025] Referring to Figure 2 and Figure 3 , the longitudinal feeding mechanism 2 comprises a longitudinally arranged longitudinal screw rod 21, longitudinally arranged longitudinal guide columns 22 arranged on both sides of the longitudinal screw rod 21, a first motor 23 for driving the longitudinal screw rod 21 to rotate, and a first nut seat 24 threadedly connected to the longitudinal screw rod 21. The longitudinal base 26 is fixedly connected to the first nut seat 24. The longitudinal guide columns 22 are slidably provided with a first sliding seat 25 fixedly connected to the longitudinal base 26. The above arrangement can realize the precise movement of the longitudinal base 26, thereby ensuring the stable movement of the sanding mechanism 4 in the longitudinal direction and improving the processing precision.

[0026] Referring to Figure 4The transverse feeding mechanism 3 comprises a transversely arranged transverse screw 32, transverse guide columns 33 arranged on both sides of the transverse screw 32, a second motor 34 for driving the transverse screw 32 to rotate, and a second nut seat 35 threadedly connected to the transverse screw 32. The transverse base 31 is fixedly connected to the second nut seat 35, and the transverse guide columns 33 are slidably provided with a second sliding seat 36 fixedly connected to the transverse base 31. The arrangement can realize accurate movement of the transverse base 31, thereby ensuring stable movement of the sanding mechanism 4 in the transverse direction and further improving the machining precision.

[0027] Referring to Figure 1 , Figure 2 , Figure 5 and Figure 6 , at least two sanding mechanisms 4 are arranged on the transverse base 31 one by one through the constant pressure mechanism 7. The constant pressure mechanism 7 comprises a transverse constant pressure assembly 71 and a longitudinal constant pressure assembly 72. The transverse constant pressure assembly 71 comprises a first constant pressure cylinder 711 with transverse output, second guide columns 712 oppositely arranged on both sides of the first constant pressure cylinder 711, a first fixed seat 713 slidably arranged on the second guide columns 712 and connected to the output end of the first constant pressure cylinder 711, and a second fixed seat 714 slidably arranged on the second guide columns 712.

[0028] The longitudinal constant pressure assembly 72 comprises third guide columns 722 arranged on the first fixed seat 713 and the second fixed seat 714 respectively, and a second constant pressure cylinder 721 fixedly connected to the first fixed seat 713 and the second fixed seat 714. The second constant pressure cylinder 721 is arranged between the third guide columns 722 and outputs in the longitudinal direction. The sanding mechanism 4 is slidably arranged on the third guide columns 722 through a fourth sliding seat 723 and is fixedly connected to the output end of the second constant pressure cylinder 721.

[0029] The first constant pressure cylinder 711 and the second constant pressure cylinder 721 of the constant pressure mechanism 7 have adjustable output pressure. When the sanding mechanism 4 contacts the workpiece, the first constant pressure cylinder 711 and the second constant pressure cylinder 721 will automatically adjust according to the contact resistance. If the surface of the workpiece is uneven, the first constant pressure cylinder 711 and the second constant pressure cylinder 721 will automatically adjust the air pressure to maintain the preset pressure value, ensuring the stable contact force of the sanding mechanism 4 on the workpiece. This arrangement replaces the rigid contact between the sanding mechanism 4 and the workpiece with flexible release, reduces rigid impact, achieves buffering effect, and avoids damage to the workpiece and the sanding mechanism 4.

[0030] Referring to Figures 5 to 7The sanding mechanism 4 comprises a sanding base plate 41 fixedly connected with the output end of the second constant pressure cylinder 721, a feeding disc 42, a collecting disc 43, a sanding arm 44 arranged between the feeding disc 42 and the collecting disc 43, a sand belt and a feeding mechanism 45 arranged on the sanding base plate 41, the sanding base plate 41 is fixedly connected with the fourth sliding seat 723 of the third guide column 722, the sanding arm 44 is provided with a sanding head 441 extending below the sanding base plate 41, one end of the sand belt is wound on the feeding disc 42, the other end of the sand belt is wound on the collecting disc 43 after passing through the sanding arm 44, and the feeding mechanism 45 is used for pulling the sand belt to realize feeding of the feeding disc 42, and the above arrangement can realize automatic replacement of the sand belt, thereby guaranteeing continuity and stability of the sanding process and improving processing efficiency.

[0031] Referring to Figure 7 and Figure 8 , the feeding mechanism 45 comprises a driving wheel 451 arranged on one side of the sanding base plate 41, a driven wheel 452 arranged on the other side of the sand belt, and a belt replacement motor 453, the driving wheel 451 can be driven to rotate by the belt replacement motor 453 to pull the sand belt, and the above arrangement can realize automatic replacement and tension adjustment of the sand belt, thereby guaranteeing continuity and stability of the sanding process and further improving processing efficiency.

[0032] Referring to Figure 7 , the driven wheel 452 is provided with a belt loading cylinder 454 driving the driven wheel 454 to adjust the distance between the driving wheel 451 and the driven wheel 452, the distance between the driven wheel 452 and the driving wheel 451 is increased by the belt loading cylinder 454 to facilitate loading of the sand belt, and after the sand belt is loaded, the distance is reduced to ensure that the driven wheel 452 and the driving wheel 451 are in contact with the sand belt.

[0033] Referring to Figure 7 , the detection mechanism 46 comprises a detection wheel 461, a detection driving device 462 driving the detection wheel 461 to abut against the surface of the sand belt, and a sensor for detecting the travel of the detection wheel 461, the above arrangement can determine whether the sand belt is broken through the travel of the detection wheel 461, specifically, when the sand belt is complete, the sand belt will hinder the movement of the detection wheel 461, so that the travel of the detection wheel 461 is reduced, thereby judging that the sand belt is complete, when the sand belt is broken, the detection wheel 461 will not be hindered by the sand belt, so that the travel of the detection wheel 461 is increased, thereby judging that the sand belt is broken, and a specific detection method can be achieved by arranging an existing electromagnetic sensor to detect the travel of the detection wheel 461, and a detection principle is not the invention point of the utility model, which will not be described here.

[0034] Referring to Figure 1 , Figure 2 , Figure 9 and Figure 10The rotating mechanism 5 comprises a driving cylinder 52 with an output direction perpendicular to the longitudinal base 26, first guide columns 53 oppositely arranged on both sides of the driving cylinder 52, a mounting base 54 connected with the output end of the driving cylinder 52, a rotating driving device 55 arranged on the mounting base 54, a rotating shaft 56 driven to rotate by the rotating driving device 55 and arranged in parallel to the longitudinal base 26, and a jig 51 arranged on the upper end of the rotating shaft 56. The first guide columns 53 are slidably provided with third sliding bases 57 fixedly connected with the mounting base 54. The arrangement can realize stable rotation of the workpiece, thereby ensuring uniformity and consistency of the sanding process, improving the processing quality, and through the arrangement of the driving cylinder 52, the jig 51 can be adjusted in a direction perpendicular to the longitudinal base 26, facilitating feeding and discharging of the workpiece.

[0035] Referring to Figure 1 The dust cover 6 is arranged on the machine base 1 and is provided with a sanding operation opening 61 on the upper side for the sanding arm 44 to enter, a jig entering opening 62 for the jig 51 to enter, and a avoiding gap 63 for the rotating shaft 56 to pass through. The arrangement can effectively reduce the influence of dust generated in the sanding process on the environment and the operator. Further, the dust cover 6 is also provided with a dust collection system for adsorbing dust and reducing environmental pollution.

[0036] Referring to Figure 1 , Figure 2 , Figure 9 and Figure 10 The machine base 1 comprises a base 11 and a rack 12 arranged on the upper side of the base 11. The longitudinal feeding mechanism 2 is arranged on the upper side of the rack 12. The rack 12 is provided with an open-sided accommodating cavity 13. The driving cylinder 52 and the first guide columns 53 are partially arranged in the accommodating cavity 13. The mounting base 54 is provided with an assembly horizontal part 541 partially arranged in the accommodating cavity 13 and an assembly vertical part 542 arranged outside the accommodating cavity 13 and connected with the assembly horizontal part 541. The rotating driving device 55 comprises a driving wheel 551 arranged in the assembly horizontal part 541, a driven wheel 552, a belt 553 sleeved on the driving wheel 551 and the driven wheel 552, and a rotating motor 554 arranged on the upper side of the assembly horizontal part 541 and connected with the driving wheel 551. One end of the rotating shaft 56 is connected with the driven wheel 552, and the other end penetrates through the assembly vertical part 542. The outer side of the rotating motor 554 is wrapped with a protective cover 555. The dust cover is fixedly connected with the rack 12. The arrangement of the machine base 1 reasonably utilizes the space below the longitudinal feeding mechanism 2 to accommodate part of the rotating mechanism 5, which not only makes the sanding machine more compact, but also reduces the occupied space of the entire sanding machine and improves the space utilization.

[0037] The output direction of the cylinder indicates the direction of the movable output end.

[0038] Compared with the prior art, the multi-station sanding machine disclosed by the utility model realizes the synchronous movement and cooperative work of the at least two sanding mechanisms 4 by setting the longitudinal feeding mechanism 2 and the transverse feeding mechanism 3, so that the at least two sanding mechanisms 4 share the same XY feeding system, thereby being capable of simultaneously and synchronously polishing multiple workpieces, greatly improving the processing efficiency, reducing the feeding error between the sanding mechanisms 4, and making the consistency of the processed workpieces good. The setting mode not only reduces the number of devices and the occupied space, but also can combine multiple sanding machines according to actual process requirements, thereby adapting to the processing requirements of different products. For example, in a specific application scenario, two sanding mechanisms 4 can be arranged to process the inner surface and the outer surface of the workpiece respectively, or two sanding mechanisms 4 are arranged to process the outer surface / inner surface of the workpiece. In another specific application scenario, two multi-station sanding machines can be configured, each of which is arranged with two sanding mechanisms 4. The two sanding mechanisms 4 of one multi-station sanding machine coarsely sand the inner surface and the outer surface of the workpiece respectively, and the two sanding mechanisms 4 of the other multi-station sanding machine finely sand the inner surface and the outer surface of the workpiece respectively. Two devices share two XY feeding systems to complete all polishing processes of four workpieces, thereby effectively reducing the investment in equipment, reducing the occupied space of the equipment, facilitating the utilization of the work space, and greatly improving the work efficiency.

[0039] According to the disclosure and teaching of the above description, the person skilled in the art of the utility model can also change and modify the above embodiments. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the utility model should fall within the protection scope of the claims of the utility model. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the utility model.

Claims

1. Multi-station sander, characterized in that, The machine base (1) and the longitudinal base (26) are fixedly connected, and the longitudinal guide column (22) is slidably provided with the first sliding seat (25) fixedly connected with the longitudinal base (26). The longitudinal feeding mechanism (2) is provided with a longitudinally movable longitudinal base (26); The transverse feeding mechanism (3) is arranged below the at least two sanding mechanisms (4), and each transverse mechanism (5) is provided with a rotatable jig (51). The longitudinal feeding mechanism (2) includes a longitudinally arranged longitudinal screw (21), longitudinal guide columns (22) arranged on both sides of the longitudinal screw (21), a first motor (23) driving the longitudinal screw (21) to rotate, and a first nut seat (24) threaded on the longitudinal screw (21), the longitudinal base (26) is fixedly connected with the first nut seat (24), and the longitudinal guide column (22) is slidably provided with the first sliding seat (25) fixedly connected with the longitudinal base (26). The transverse feeding mechanism (3) includes a transversely arranged transverse screw (32), transverse guide columns (33) arranged on both sides of the transverse screw (32), a second motor (34) driving the transverse screw (32) to rotate, and a second nut seat (35) threaded on the transverse screw (32), the transverse base (31) is fixedly connected with the second nut seat (35), and the transverse guide column (33) is slidably provided with the second sliding seat (36) fixedly connected with the transverse base (31).

2. The multi-station sander of claim 1, wherein, The sanding mechanism (4) includes a sanding base plate (41), a feeding disc (42) arranged on the sanding base plate (41), a receiving disc (43), a sanding arm (44) arranged between the feeding disc (42) and the receiving disc (43), a sanding belt and a feeding mechanism (45), the sanding arm (44) is provided with a sanding head (441) extending below the sanding base plate (41), one end of the sanding belt is wound on the feeding disc (42), the other end is wound on the receiving disc (43) after passing through the sanding arm (44), and the feeding mechanism (45) is used to pull the sanding belt to realize feeding of the feeding disc (42).

3. The multi-station sander of claim 1, wherein, The feeding mechanism (45) includes a driving wheel (451) arranged on the sanding base plate (41) on one side of the sanding belt, a driven wheel (452) arranged on the other side of the sanding belt, and a belt changing motor (453), the driving wheel (451) can be driven to rotate by the belt changing motor (453) to pull the sanding belt.

4. The multi-station sander of claim 1, wherein, ​ 5. The multi-station sander of claim 4, wherein, ​ 6. The multi-station sander of claim 4, wherein, Also included is a detection mechanism (46) disposed between the material receiving tray (43) and the abrasive belt, the detection mechanism (46) comprising a detection wheel (461), a detection driving device (462) driving the detection wheel (461) to abut against the surface of the abrasive belt, and a sensor for detecting the active stroke of the detection wheel (461).

7. The multi-station sander of claim 1, wherein, The rotating mechanism (5) comprises a driving cylinder (52) with an output direction perpendicular to the longitudinal base (26), first guide columns (53) oppositely arranged on both sides of the driving cylinder (52), a mounting seat (54) connected with the output end of the driving cylinder (52), a rotating driving device (55) disposed on the mounting seat (54), a rotating shaft (56) driven to rotate by the rotating driving device (55) and arranged in parallel with the longitudinal base (26), and a jig (51) mounted on the upper end of the rotating shaft (56), and the first guide columns (53) are slidably provided with third sliding seats (57) fixedly connected with the mounting seat (54).

8. The multi-station sander of claim 7, wherein, Also included is a dust cover (6) disposed on the machine base (1), the dust cover (6) being configured with a sanding operation opening (61) on the upper side, a jig access opening (62) for the jig (51) to enter, and a relief gap (63) for the rotating shaft (56) to pass through.

9. The multi-station sander of claim 8, wherein, The machine base (1) comprises a base (11) and a machine frame (12) disposed on the upper side of the base (11), the longitudinal feeding mechanism (2) is disposed on the upper side of the machine frame (12), the machine frame (12) is configured with an open-sided accommodating cavity (13), the driving cylinder (52) and the first guide column (53) are partially disposed in the accommodating cavity (13), the mounting seat (54) is configured with an assembly horizontal part (541) partially disposed in the accommodating cavity (13), and an assembly vertical part (542) located outside the accommodating cavity (13) and connected with the assembly horizontal part (541), the rotating driving device (55) comprises a driving wheel (551) disposed in the assembly horizontal part (541), a driven wheel (552), a belt (553) sleeved on the driving wheel (551) and the driven wheel (552), and a rotating motor (554) disposed on the upper side of the assembly horizontal part (541) and connected with the driving wheel (551), one end of the rotating shaft (56) is connected with the driven wheel (552), the other end penetrates through the assembly vertical part (542), the outer side of the rotating motor (554) is wrapped with a protective cover (555), and the dust cover is fixedly connected with the machine frame (12).

10. The multi-station sander of claim 1, wherein, Each sanding mechanism (4) is installed on the transverse base (31) through a constant pressure mechanism (7), the constant pressure mechanism (7) comprises a transverse constant pressure assembly (71) and a longitudinal constant pressure assembly (72), the transverse constant pressure assembly (71) comprises a first constant pressure cylinder (711) with transverse output, a second guide column (712) oppositely arranged on both sides of the first constant pressure cylinder (711), a first fixed seat (713) slidably arranged on the second guide column (712) and connected with the output end of the first constant pressure cylinder (711), and a second fixed seat (714) slidably arranged on the second guide column (712); The longitudinal constant pressure assembly (72) comprises a third guide column (722) arranged on the first fixed seat (713) and the second fixed seat (714) respectively, a second constant pressure cylinder (721) fixedly connected with the first fixed seat (713) and the second fixed seat (714), the second constant pressure cylinder (721) is arranged between the third guide column (722) and outputs in the longitudinal direction, and the sanding mechanism (4) is slidably arranged on the third guide column (722) through a fourth sliding seat (723) and is fixedly connected with the output end of the second constant pressure cylinder (721).

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