Vertical belt sander

Abstract

A vertical belt sander has a motor 1 mounted below a base plate 3 and within the space enclosed by machine feet 4. The vertical beam 5 is straight from its bottom to below the upper support arm assembly 7, and its cross-sectional shape is identical at all positions. Because the motor 1 is mounted below the base plate 3, it no longer interferes with the arrangement of the vertical beam 5 and attachments 6. The vertical beam 5 can be positioned as far forward as possible, with the distance from its surface to the leading edge of the drive wheel 2 as low as 2-7 cm, only 1 / 10 to 1 / 3 of that in known technologies. Therefore, its support strength for attachments 6 is very high, and the same or even higher strength requirements can be achieved using very thin materials. The vertical beam 5 can be directly manufactured using standard pipes, bars, profiles, or linear guides with the same cross-sectional shape, greatly simplifying the overall structure, significantly reducing costs, and allowing for flexible arrangement of attachments 6 with ample room for improvement and expansion. This utility model is a cleverly designed and high-performance vertical belt sander.

Description

Technical Field

[0001] This utility model relates to a vertical belt sander, and belongs to the technology for modifying vertical belt sanders. Background Technology

[0002] The vertical belt sanders described in patents CN119115740A and CN307769704S are basically the same as similar products on the market. Their motors are all mounted on the upper surface of the base plate in parallel with the vertical beam. The width of the motors is almost more than half the width of the vertical belt sander. Accessories, which are auxiliary devices to expand the processing performance and application range of the vertical belt sander, are mounted on the vertical beam or the base plate. These accessories mainly include, but are not limited to, worktables, belt support plates, dust plates, dust covers, safety guards, belt guide wheels, fixed angle grinding devices, work lights, exhaust fans, air ducts, cooling pipes, and various operating parts. Because the motor and vertical beam are mounted side-by-side on the upper surface of the base plate, and the width of the motor is more than half the width of the vertical belt sander, the motor significantly hinders the design and layout of the vertical beam and accessories. The distance from the surface of the vertical beam to the leading edge of the drive pulley generally needs to be greater than the sum of the motor's outer diameter and the drive pulley's outer diameter to avoid interference. Taking a commonly used 90-frame motor as an example, using a drive pulley with an outer diameter of 130 mm, this value will be greater than 175 mm. Considering redundancy, this value will generally exceed 195 mm, almost equivalent to the outer diameter of the 90-frame motor. If a larger diameter drive pulley is used... The value would be even greater for a vertical belt sander of this size, which is obviously too large. This would result in excessively long connection distances for accessories mounted on the vertical beam, leading to insufficient support strength. To address this, some manufacturers have welded one or two large thick steel plates to the upper middle part of the vertical beam, above the motor, to reinforce the connection with these accessories. However, this further complicates the vertical beam structure, significantly increasing production costs. The steel plates themselves also severely hinder the design and layout of accessories, leaving little room for improvement or expansion for this type of vertical belt sander. Because the vertical beam's support strength for accessories is limited, and to reduce costs, the aforementioned known technologies primarily use shorter vertical beams. Therefore, the 915-type vertical belt sander, using a 915mm long sanding belt, has become the main model. This shorter vertical beam further reduces the operational and improvement space of the known technologies. Simultaneously, because the motor occupies most of the space on the base plate and is adjacent to the vertical beam, the size, installation position, and type of accessories that can be mounted on the base plate or vertical beam are severely constrained by the motor, greatly limiting its functional expansion. Furthermore, the motor and the vertical beam are installed side by side. The height of the vertical beam is equal to the height from the center of the motor to the top of the vertical beam plus the height of the center of the motor. In other words, part of the height of the vertical beam will be wasted on offsetting the height of the motor, which not only further weakens the strength of the vertical beam, but also wastes a lot of materials. Summary of the Invention

[0003] To overcome the shortcomings of known technologies, this utility model provides a vertical belt sander, in which the design and layout of its accessories on the vertical beam and base plate are no longer affected by the motor, the vertical beam provides high support strength for the accessories, the overall structure is very simple, the cost is significantly reduced, and there is great potential for improvement and expansion.

[0004] This utility model mainly adopts the concept of installing the motor under the base plate, leaving all the space above the base plate for the vertical beam and accessories, thus completely eliminating the constraint of the motor. This not only allows the vertical beam and accessories to be arranged as close as possible to ensure the support strength of the vertical beam for the accessories, but also ensures that the vertical beam is straight from its bottom to the upper support arm assembly and has the same cross-sectional shape at any position, which greatly simplifies the overall structure and makes the layout of the vertical beam and accessories more flexible, convenient, and multifunctional.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: it includes a motor, a drive wheel mounted on the motor's rotating shaft, a base plate, machine feet mounted below the base plate and arranged along its perimeter, a vertical beam mounted on the base plate, an accessory mounted on the vertical beam or the base plate, a driven wheel mounted on the upper support arm assembly at the upper end of the vertical beam, and a sanding belt fitted on the drive wheel and the driven wheel. The motor is mounted below the base plate and located in the space clamped by the machine feet. The vertical beam is straight from its bottom to the upper support arm assembly and has the same cross-sectional shape at any position.

[0006] The cross-sectional shape of the aforementioned vertical beam is rectangular from its bottom up to any position below the upper support assembly.

[0007] The cross-sectional shape of the aforementioned vertical beam, from its bottom to any position below the upper support assembly, is a regular hexagon among regular polygons.

[0008] The cross-sectional shape of the aforementioned vertical beam, from its bottom to any position below the upper support assembly, is a regular octagon among regular polygons.

[0009] The cross-sectional shape of the aforementioned vertical beam is circular from its bottom above to any position below the upper support arm assembly.

[0010] The cross-sectional shape of the aforementioned vertical beam, from its bottom above to any position below the upper support assembly, is H-shaped.

[0011] The cross-sectional shape of the aforementioned vertical beam, from its bottom above to any position below the upper support assembly, is U-shaped.

[0012] The cross-sectional shape of the aforementioned vertical beam, from its bottom to any position below the upper support assembly, is a rectangular boss formed by chamfering the adjacent two corners.

[0013] The cross-sectional shape of the aforementioned vertical beam, from its bottom above to any position below the upper support assembly, is a dovetail groove.

[0014] The cross-sectional shape of the aforementioned vertical beam, from its bottom above to any position below the upper support assembly, consists of two rectangles with equal center-to-center distance.

[0015] Because the motor is installed below the base plate and within the space clamped by the machine feet, the layout of the vertical beam and accessories on the base plate is no longer affected by the motor. Considering the size of the accessories themselves and the size of the upper support arm assembly, the position of the vertical beam can be as close to the accessories as possible, thereby ensuring its support strength for the accessories. The distance from the surface of the vertical beam to the leading edge of the drive wheel can be as low as 2-7 cm, which is only 1 / 10-1 / 3 of that in the prior art. Therefore, the same or even higher strength requirements can be achieved using very thin materials, which not only significantly reduces costs but also facilitates lightweight design. At the same time, the huge space freed up on the base plate allows for more convenient and flexible installation of various accessories, thereby expanding the functionality of this invention. Furthermore, the effective height of the machine feet will be greater than the height of the motor. The motor is clamped and installed in the above-mentioned position, which can greatly reduce the probability of damage caused by impact and significantly reduce the damage from abrasive belt grinding dust, thereby improving its service life. Since the height of the vertical beam is equal to the height from the center of the motor to the top of the beam minus the height of the motor center, and then minus the thickness of the base plate, the height of the vertical beam in this invention is approximately the height of one motor shorter than that in known technologies, saving a significant amount of material in manufacturing the vertical beam. Because the vertical beam is straight from its bottom to the upper support assembly, and the cross-sectional shape is identical at any position, it can be directly manufactured using standard raw materials with the same cross-sectional shape, such as straight pipes, bars, profiles, or linear guides. This greatly simplifies the structure of this invention, significantly reduces costs, and allows for more flexible, convenient, and multifunctional arrangement of accessories, with significant potential for improvement and expansion. This invention is a cleverly designed and high-performance vertical belt sander.

[0016] It is important to note that installing the motor under the base plate, while seemingly very simple, is actually a design that most inventors would not have considered and is somewhat controversial. This is the fundamental reason why publicly known technology has not yet emerged. Firstly, belt sanders are a relatively niche type of grinding machine tool, with horizontal belt sanders making up the vast majority. The vertical belt sander to which this utility model pertains is even more obscure, with only a small number of small and micro-enterprises producing it nationwide. Its research and development is extremely weak. Through online searches and the "Comprehensive Patent Search and Analysis" using the keyword "belt sander," the vast majority of the more than two thousand patent records are related to horizontal belt sanders. No vertical belt sander was found to use a design similar to or identical to this utility model. Secondly, the base plate is usually considered the "chassis," and logically its height should be minimized to improve overall machine stability. However, this invention does the opposite, raising the base plate above the height of the motor. This could easily create the illusion of a top-heavy design. In reality, apart from the raised base plate, the height of the motor, vertical beam, and accessories is not significantly different from that in known technologies. Moreover, the weight of the base plate itself is not a large proportion of the overall machine weight. In other words, the overall stability is not significantly different from known technologies, but this design could easily mislead inventors and prevent them from considering this approach. Thirdly, the height of common machine feet is only three or four centimeters or less, so the gap under the base plate of a vertical belt sander is very low, making it impossible to accommodate a motor that is generally over twenty centimeters tall. Therefore, most inventors would never have imagined that by thickening and lengthening the machine feet to an effective height exceeding the height of the motor, the motor could be installed under the base plate. Fourth, vertical belt sanders are essentially belt drive devices, so they generally use horizontal motors. This invention installs the motor under the base plate, which requires the motor to be inverted. This installation method has drawbacks such as being unconventional and inconvenient for installation, inspection, and maintenance. In addition, it requires the design of machine feet that are higher than the motor. Even if other inventors thought of this, they would not see its huge potential advantages because they only saw its disadvantages and would subconsciously reject it. Fifth, the vertical beam height of this utility model is approximately the height of a motor shorter than that of the prior art. The prior art mainly uses a 915 mm long sanding belt, i.e., the 915 type vertical belt sander, whose vertical beam height is only about 400 mm. If the structure of this utility model is adopted, the vertical beam height will be reduced to about 200 mm. In such a small space, the advantages of the accessory layout design will be greatly reduced. In other words, the value of directly adopting the structure of the prior art is not very high. Due to limited interests and short-sighted inertia, the industry will not recognize or propose this structure. However, this utility model can take advantage of the strength to design a longer sanding belt, such as 2100 mm, 3000 mm or even longer. The corresponding vertical beam height needs to be increased to 800 mm, 1250 mm or even higher, and the advantage becomes exceptionally significant. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of this utility model.

[0019] Figure 2 This is an exploded three-dimensional structural diagram of Embodiment 1 of this utility model.

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 1 of this utility model.

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 2 of this utility model.

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 3 of this utility model.

[0023] Figure 6 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 4 of this utility model.

[0024] Figure 7 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 5 of this utility model.

[0025] Figure 8 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 6 of this utility model.

[0026] Figure 9 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 7 of this utility model.

[0027] Figure 10 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 8 of this utility model.

[0028] Figure 11 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 9 of this utility model.

[0029] Figure 12 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 10 of this utility model.

[0030] Figure 13 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 11 of this utility model.

[0031] Figure 14 This is a schematic diagram of the three-dimensional structure and the cross-sectional shape of the vertical beam in Embodiment 12 of this utility model.

[0032] In the diagram: 1. Motor, 2. Drive wheel, 3. Base plate, 31. Reinforcing member, 4. Machine foot, 5. Vertical beam, 51. Shaft hole one, 52. Connecting member, 53. Extension beam, 54. Vertical beam one, 55. Vertical beam two, 6. Accessories, 61. Clamp, 7. Upper support arm assembly, 71. Shaft, 72. Shaft hole two, 8. Driven wheel, 9. Sanding belt. Detailed Implementation

[0033] Example 1:

[0034] The structural schematic diagram of this utility model is shown below. Figure 1 As shown in 2 and 3, Figure 3 The right-side center section is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom above to any position below the upper support arm assembly 7. It includes a motor 1, a drive wheel 2 mounted on the rotating shaft of the motor 1, a base plate 3, machine feet 4 mounted below the base plate 3 and arranged along its perimeter, a vertical beam 5 mounted on the base plate 3, an accessory 6 mounted on the vertical beam 5 or the base plate 3, a driven wheel 8 mounted on the upper support arm assembly 7 at the upper end of the vertical beam 5, and a sanding belt 9 fitted onto the drive wheel 2 and the driven wheel 8. The motor 1 is mounted below the base plate 3 and located below the machine feet 4. Within the enclosed space, the vertical beam 5 is straight from its bottom to below the upper support assembly 7, and the cross-sectional shape is the same at any position. The cross-sectional shape of the vertical beam 5 from its bottom to below the upper support assembly 7 is rectangular. The cross-sectional shape of the vertical beam 5 at any position above the upper support assembly 7 corresponds to its lower shape. The shaft 71 passes through the shaft hole 51 at the upper end of the vertical beam 5 and the shaft hole 72 on the upper support assembly 7 to install the upper support assembly 7 on the vertical beam 5. The accessory 6 installed on the vertical beam 5 is fastened by the clamp 61.

[0035] like Figure 1 As shown, this utility model does not involve the inventive design of Attachment 6 and Sanding Belt 9, but these two types of parts cover too large an area in the figure and need to be combined with Figure 2 Only then can the actual structure of this utility model be clearly distinguished, and thus the following diagram is drawn. Figure 3 The simplified three-dimensional structural diagram shown in the figure does not depict the sand belt 9, and only one piece of accessory 6 is shown. This reduces the obstruction of the vertical beam 5 and the base plate 3, allowing for a more accurate view of the actual structure of this utility model.

[0036] like Figure 2As shown in Figure 3, since the motor 1 is installed below the base plate 3 and within the space clamped by the machine feet 4, the layout of the vertical beam 5 and the accessory 6 on the base plate 3 is no longer affected by the motor 1. Considering the size of the accessory 6 itself and the size of the upper support arm assembly 7, the position of the vertical beam 5 can be as close to the accessory 6 as possible to ensure its support strength for the accessory 6. The distance from the surface of the vertical beam 5 to the front edge of the drive wheel 2 can be as low as 2-7 cm, which is only 1 / 10-1 / 3 of the known technology. Therefore, the same or even higher strength requirements can be achieved by using very thin materials, which not only significantly reduces costs but also facilitates lightweight design. At the same time, the huge space freed up on the base plate 3 allows for more convenient and flexible installation of various accessories 6 to expand the functionality of this invention. Furthermore, the effective height of the machine feet 4 will be greater than the height of the motor 1. The motor 1 is clamped and installed in the above-mentioned position, which can greatly reduce the probability of damage caused by impact and significantly reduce the damage from sanding dust, thereby improving its service life. Since the height of the vertical beam 5 is equal to the height from the center of motor 1 to the top of the vertical beam 5 minus the height of the center of motor 1, and then minus the thickness of the base plate 3, the height of the vertical beam 5 in this invention is approximately the height of one motor shorter than that in the prior art, thus saving a significant amount of material in manufacturing the vertical beam 5. Because the vertical beam 5 is straight from its bottom to below the upper support arm assembly 7, and the cross-sectional shape at any position is a rectangle with the same shape, and the cross-sectional shape at any position above the upper support arm assembly 7 corresponds to the shape of its lower part, the vertical beam 5 is straight from bottom to top with a rectangular cross-section. It can be manufactured using straight square tubes, rectangular tubes, square steel, or rectangular steel, thus greatly simplifying the structure of this invention and significantly reducing costs. Simultaneously, the accessory 6 installed on the vertical beam 5 is secured by clamps 61. The accessory 6 can be arranged at different heights on the vertical beam 5, making it more flexible, convenient, and multifunctional, with significant potential for improvement and expansion. This invention is a cleverly designed and high-performance vertical belt sander.

[0037] It should also be noted that the motor 1 of this utility model should preferably be a horizontal motor. For this purpose, it needs to be inverted and installed on the lower surface of the base plate 3. Of course, the motor 1 can also be a vertical motor. Since the mounting hole of the vertical motor is on the flange at the end of the motor and is perpendicular to the base plate 3, it can be indirectly installed under the base plate 3 without any creative effort. The advantage is that the motor 1 does not need to be inverted, but its structure is more complex and the cost is much higher.

[0038] Example 2:

[0039] The structural schematic diagram of this utility model is shown below. Figure 4As shown in the figure, the bubble diagram in the upper left corner is a partial schematic diagram of the connector 52 installed at the rear of the upper end of the vertical beam 5. The middle right side is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7. This embodiment is largely the same as Embodiment 1, except that in this embodiment, a connector 52 with a shaft hole 51 is installed at the rear of the upper end of the vertical beam 5, and the upper support arm assembly 7 is installed on the shaft hole 51. The further forward the vertical beam 5 is arranged, the shorter the connection distance with the accessory 6, and the position of the shaft hole 51 on the vertical beam 5 needs to be moved backward to ensure that the upper support arm assembly 7 has sufficient vertical swing. When the position of the vertical beam 5 is forward enough, the position of the shaft hole 51 will move outside the vertical beam 5. At this time, a corresponding connector 52 needs to be installed at the rear end of the vertical beam 5. The connector 52 has a shaft hole 51 that matches the upper support arm assembly 7 to ensure the correct installation and docking of the vertical beam 5 and the upper support arm assembly 7. The main advantage of this embodiment is that the connection distance between the vertical beam 5 and the accessory 6 can be very short, without having to design the shaft hole 72 on the upper support arm assembly 7 to be too far forward, because that would result in the upper support arm assembly 7 having too small an up-and-down swing range, making it inconvenient to replace the sanding belt 9, and even making it difficult to ensure the tension of the sanding belt 9.

[0040] Example 3:

[0041] The structural schematic diagram of this utility model is shown below. Figure 5 As shown in the figure, the bubble diagram in the upper left corner is a partial schematic diagram of the upper end of the vertical beam 5 and the extension beam 53. The middle right side is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7. This embodiment is largely the same as Embodiment 2, except that in this embodiment, the cross-sectional shape at any position above the upper support arm assembly 7 does not correspond to its lower shape, but rather bends backward to form the extension beam 53. Therefore, the vertical beam 5 is not straight as a whole. There is a shaft hole 51 at the rear end of the extension beam 53, and the upper support arm assembly 7 is installed on the shaft hole 51. The main advantage of this embodiment is that the connection distance between the vertical beam 5 and the accessory 6 can be very short, without needing to design the shaft hole 72 on the upper support arm assembly 7 to be too far forward. Moreover, the extension beam 53 and the connector 52 in Embodiment 2 have the same function, which is to install the upper support arm assembly 7. However, this embodiment has a much simpler structure and lower mass production costs.

[0042] Example 4:

[0043] The structural schematic diagram of this utility model is shown below. Figure 6As shown in the figure, the right-hand side of the diagram is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7. This embodiment is largely the same as Embodiment 1, except that in this embodiment, the vertical beam 5 is tilted forward by 20 degrees, and the attachment 6 mounted on the vertical beam 5 is tilted downward by 20 degrees. When grinding a right-angle end face, in the most comfortable operating and gripping state, the workpiece is tilted upward by about 20 degrees, which fits perfectly against the upper surface of the attachment 6. Even after long-term operation, fatigue is not easily experienced. Therefore, this embodiment is a dedicated grinding machine for right-angle end faces designed according to ergonomic principles, which is a very widely applicable scenario for this utility model. In addition, grinding 45-degree angle end faces is also frequently used in production practice. If this utility model is required to grind such end faces specifically, according to geometric calculations, the vertical beam 5 should be tilted backward by 25 degrees. Of course, the attachment 6 mounted on the vertical beam 5 should still be tilted downward by 20 degrees, so that the most comfortable operating and gripping state can still be maintained during grinding.

[0044] Example 5:

[0045] The structural schematic diagram of this utility model is shown below. Figure 7 As shown in the figure, the bubble diagram in the upper left corner is a partial schematic diagram of the connection piece 52 installed at the rear of the upper end of the vertical beam 5. The middle right side is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7. This embodiment is largely the same as embodiment 2, except that: in this embodiment, the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7 is a regular hexagon in a regular polygon. The vertical beam 5 has six sides, which is two more than a rectangle. Therefore, the accessory 6 can be installed and arranged more flexibly, thereby expanding the function of this utility model. In addition, the vertical beam 5 can be manufactured using common hexagonal steel pipes or hexagonal steel bars, which are easy to purchase and help control costs.

[0046] Example 6:

[0047] The structural schematic diagram of this utility model is shown below. Figure 8As shown in the figure, the bubble diagram in the upper left corner is a partial schematic diagram of the connecting piece 52 installed at the upper rear of the vertical beam 5. The lower right part is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7. The lower right part is a schematic diagram of the cross-sectional shape of the reinforcing member 31. This embodiment is largely the same as embodiment 2, except that in this embodiment, the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7 is a regular octagon, and it is installed on the base plate 3 by a reinforcing member 31 with a different shape. The vertical beam 5 has eight sides, four more than a rectangle, so the attachment 6 can be installed and arranged more flexibly, thereby expanding the function of this utility model. In addition, the vertical beam 5 can be manufactured using common octagonal steel pipes or octagonal steel bars, which are easy to purchase and help control costs. The vertical beam 5 is installed on the base plate 3 by the reinforcing member 31, which can effectively avoid stress concentration and significantly improve the connection rigidity. It is mainly used in heavy-duty precision models. At the same time, the shape of the reinforcing member 31 is different from that of the vertical beam 5, which makes it easier to design and manufacture. Obviously, during manufacturing, the reinforcing member 31 should be considered as part of the base plate 3.

[0048] Example 7:

[0049] The structural schematic diagram of this utility model is shown below. Figure 9 As shown in the figure, the bubble diagram in the upper left corner is a partial schematic diagram of the connecting piece 52 installed at the upper rear of the vertical beam 5. The middle right part is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7. The lower right part is a schematic diagram of the cross-sectional shape of the reinforcing member 31. This embodiment is largely the same as embodiment 6, except that in this embodiment, the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7 is circular, and it is installed on the base plate 3 by a reinforcing member 31 that is similar in shape but larger. The vertical beam 5 is cylindrical, which allows for more flexible installation and arrangement of the attachment 6, thereby expanding the function of this utility model. In addition, the vertical beam 5 can be manufactured using round steel pipes, round steel bars, or cylindrical linear guides, all of which are readily available and help control costs. Similarly, the reinforcing member 31 should also be considered as part of the base plate 3. Its function is basically the same as in embodiment 6. Its shape is similar to the vertical beam 5 but its size is larger, which is also to facilitate the arrangement of the attachment 6, increase aesthetics, and save materials.

[0050] Example 8:

[0051] The structural schematic diagram of this utility model is shown below. Figure 10As shown in the figure, the bubble diagram in the upper left corner is a partial schematic diagram of the connection piece 52 installed at the rear of the upper end of the vertical beam 5. The middle right side is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7. This embodiment is largely the same as embodiment 2, except that in this embodiment, the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7 is H-shaped, which has better strength than other shapes. Moreover, the vertical beam 5 can be manufactured using H-beams, I-beams, rail steel, or I-beam linear guides. These materials are easy to purchase and help control costs.

[0052] Example 9:

[0053] The structural schematic diagram of this utility model is shown below. Figure 11 As shown in the figure, the right middle part of the figure is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support assembly 7. This embodiment is largely the same as embodiment 1, except that: in this embodiment, the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support assembly 7 is U-shaped, which is lightweight and has high strength. Moreover, the vertical beam 5 can be made of channel steel, U-shaped steel or C-shaped steel, which are easy to purchase and help control costs.

[0054] Example 10:

[0055] The structural schematic diagram of this utility model is shown below. Figure 12 As shown in the figure, the bubble diagram in the upper left corner is a partial schematic diagram of the connecting piece 52 installed at the rear of the upper end of the vertical beam 5. The middle right side is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7. This embodiment is largely the same as embodiment 2, except that in this embodiment, the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7 is a rectangular boss formed by chamfering the adjacent two corners. This is a typical cross-sectional shape of a machine tool guide rail. In other words, the vertical beam 5 is manufactured using a machine tool guide rail with this cross-section. The purpose is to facilitate the installation and use of the precision accessory 6, and to achieve precision grinding and even automated grinding.

[0056] Example 11:

[0057] The structural schematic diagram of this utility model is shown below. Figure 13As shown in the figure, the bubble diagram in the upper left corner is a partial schematic diagram of the connecting piece 52 installed at the rear of the upper end of the vertical beam 5. The middle right part is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7. This embodiment is largely the same as embodiment 10, except that in this embodiment, the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support arm assembly 7 is a dovetail groove shape, which is also a typical cross-sectional shape of machine tool guide rails. That is to say, the vertical beam 5 is manufactured using machine tool guide rails with this cross-section. The purpose is the same as in embodiment 10, which is to facilitate the installation and use of the precision accessory 6, and to achieve precision grinding and even automated grinding.

[0058] Example 12:

[0059] The structural schematic diagram of this utility model is shown below. Figure 14 As shown in the figure, the bubble diagram in the upper left corner is a partial schematic diagram of the connector 52 installed at the upper end of the vertical beam 5. The middle right side is a schematic diagram of the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support assembly 7. This embodiment is largely the same as Embodiment 2, except that in this embodiment, the cross-sectional shape of the vertical beam 5 from its bottom to any position below the upper support assembly 7 is two rectangles with equal center distance. The vertical beam 5 is composed of two parallel vertical beams, one 54 and the other 55. The cross-sectional shape of both vertical beams 54 and 55 is rectangular. Their lower ends are respectively installed on the base plate 3, and their upper ends are jointly installed with the connector 52. The main advantage of this embodiment is that the vertical beam 5 is a double-column structure composed of two parts, which greatly improves the strength. When the strength requirement of the vertical beam 5 of this utility model is particularly high, this embodiment can meet the requirement well. Both vertical beams 54 and 55 can be made of square tubes, square steel, rectangular tubes, and rectangular steel, which can effectively control costs. Of course, without creative effort, the cross-sectional shape of the vertical beam 5 used in other embodiments of this utility model can be used to replace the vertical beam 54 and vertical beam 55 described in this embodiment.

Claims

1. A vertical belt sander, comprising a motor (1), a drive wheel (2) mounted on the rotating shaft of the motor (1), a base plate (3), machine feet (4) mounted below the base plate (3) and arranged along its periphery, a vertical beam (5) mounted on the base plate (3), an accessory (6) mounted on the vertical beam (5) or the base plate (3), a driven wheel (8) mounted on an upper support arm assembly (7) at the upper end of the vertical beam (5), and a sanding belt (9) sleeved on the drive wheel (2) and the driven wheel (8), characterized in that... The motor (1) is installed below the base plate (3) and within the space clamped by the machine foot (4). The vertical beam (5) is straight from its bottom to below the upper support arm assembly (7) and has the same cross-sectional shape at any position.

2. The vertical belt sander according to claim 1, characterized in that... The cross-sectional shape of the aforementioned vertical beam (5) is rectangular from its bottom up to any position below the upper support arm assembly (7).

3. The vertical belt sander according to claim 1, characterized in that... The cross-sectional shape of the vertical beam (5) from its bottom to any position below the upper support arm assembly (7) is a regular hexagon in a regular polygon.

4. The vertical belt sander according to claim 1, characterized in that... The cross-sectional shape of the vertical beam (5) from its bottom to any position below the upper support arm assembly (7) is a regular octagon in a regular polygon.

5. The vertical belt sander according to claim 1, characterized in that... The cross-sectional shape of the aforementioned vertical beam (5) is circular from its bottom up to any position below the upper support arm assembly (7).

6. The vertical belt sander according to claim 1, characterized in that... The cross-sectional shape of the aforementioned vertical beam (5) from its bottom to any position below the upper support arm assembly (7) is H-shaped.

7. The vertical belt sander according to claim 1, characterized in that... The cross-sectional shape of the aforementioned vertical beam (5) is U-shaped from its bottom up to any position below the upper support arm assembly (7).

8. The vertical belt sander according to claim 1, characterized in that... The cross-sectional shape of the aforementioned vertical beam (5) from its bottom up to any position below the upper support arm assembly (7) is a rectangular boss formed by chamfering the adjacent two corners.

9. The vertical belt sander according to claim 1, characterized in that... The cross-sectional shape of the vertical beam (5) from its bottom to any position below the upper support arm assembly (7) is a dovetail groove.

10. The vertical belt sander according to claim 1, characterized in that... The cross-sectional shape of the above-mentioned vertical beam (5) at any position from its bottom to the upper support arm assembly (7) is two rectangles with equal center distance.

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