Tensioning sand cavity for grinding tool

Abstract

The tensioning sand drum comprises a sand drum column, a tensioning assembly and a push-pull piece, a plurality of mounting openings are formed in the side wall of the sand drum column, the tensioning assembly comprises a tensioning plate, a movable rod and an elastic piece, a plurality of drawing holes are formed in the mounting openings in the height direction of the sand drum column, the movable rod is arranged in the drawing holes in a sliding mode, and the push-pull piece is connected with the tensioning plate. An arc-shaped protrusion is arranged on one face of the tensioning plate, the other face of the tensioning plate is fixedly connected with a movable rod and can shield the installation opening, the surface of the movable rod is sleeved with an elastic piece, and a push-pull piece is arranged at the top and / or the bottom of the sand drum column and connected with the movable rod. The annular abrasive belt can be conveniently disassembled and assembled, the use experience is optimized, and the working efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of abrasive tool equipment, and in particular to a tensioning sand drum for abrasive tools. Background Art

[0002] Abrasives are tools used for grinding, lapping and polishing. They are usually made by fixing abrasives on flexible materials such as paper, cloth, film or composite matrix with adhesives. Common ones are sandpaper and emery cloth. Some small grinders can achieve the grinding effect by equipping the grinding wheel with abrasive belts. They are lightweight, portable and easy to replace.

[0003] Generally, for the convenience of use and easy holding by users, many handheld abrasive tools or small abrasive tools have appeared on the market, which are generally equipped with a tensioning sand drum. When in use, it is generally necessary to put an annular sanding belt of suitable size on the outside of the tensioning sand drum to achieve subsequent grinding and polishing work.

[0004] However, during use, since the elasticity of the annular sanding belt that needs to be installed is generally not high and the size generally has an adapted model, when assembling it with the tensioning sand drum, the user is often required to exert a large force to assemble the two together. On the one hand, it will consume the user's energy and time during installation, and it will also require laborious removal later. On the other hand, this assembly method may cause the annular sanding belt to be skewed, affecting normal use. The sanding belt is easy to be thrown out during use, and multiple tensioning sand drums need to be prepared for replacement, which greatly affects work efficiency.

[0005] Therefore, the prior art needs to be further improved and enhanced. Utility Model Content

[0006] The present application provides a tensioning sand drum for abrasive tools to solve the problems in the prior art that the tensioning sand drum and the annular sand belt are difficult to disassemble and assemble, are easy to be thrown out, and have poor applicability.

[0007] The technical solution adopted in this application is:

[0008] The present application provides a tensioning sand drum for abrasive tools, the tensioning sand drum comprising a sand drum column, a tensioning assembly and a push-pull piece, the side wall of the sand drum column is provided with a plurality of installation openings, the tensioning assembly comprises a tensioning plate, a movable rod and an elastic piece, a plurality of pull-out holes are arranged inside the installation opening along the height direction of the sand drum column, the movable rod is slidably arranged in the pull-out hole, an arc-shaped protrusion is arranged on one side of the tensioning plate, and a movable rod is fixedly connected to the other side and can cover the installation opening, an elastic piece is sleeved on the surface of the movable rod, a push-pull piece is arranged on the top and / or bottom of the sand drum column, and the push-pull piece is connected to the movable rod.

[0009] As a preferred embodiment of the present application, the number of movable rods is the same as the number of pull-out holes, and multiple connecting rods are arranged between adjacent movable rods. The connecting rods are arranged perpendicularly to the movable rods, and several connecting rods are arranged along the length direction of the movable rods. The elastic member is a tension spring.

[0010] As a preferred embodiment of the present application, an avoidance groove is provided between adjacent pull-out holes, and the avoidance groove is provided corresponding to the connecting rod.

[0011] As a preferred embodiment of the present application, a slide is provided on the top wall and / or bottom of the sand drum column, the slide extends along the length direction of the movable rod, the number of the slide is the same as the number of the mounting openings, and the push-pull member is slidably connected to the slide.

[0012] As a preferred embodiment of the present application, the push-pull member is a button, the connecting rod protrudes from the slide, the push-pull member and the connecting rod are connected in a button structure, the slide includes an upper channel and a lower channel, the upper channel is slidably connected to the side wall of the push-pull member, the lower channel is lower than the upper channel in the vertical direction, the push-pull member includes an upper pressing portion and a lower guiding portion, and the lower guiding portion can enter and exit the lower channel.

[0013] As a preferred embodiment of the present application, the push-pull member further includes a pressing rod, one end of which is connected to the center of the bottom wall of the lower guide portion, and the other end of which is connected to the connecting rod.

[0014] As a preferred embodiment of the present application, the surface of the slide is provided with a multi-level segmented scale, and a pressing port is provided below each level of the multi-level segmented scale. The push-pull member can enter and exit the pressing port by pressing, and the pressing port is connected to the lower channel. The lower guide portion protrudes to both sides as a wing-like structure, and a guide area guiding to the center of the pressing port is provided below the pressing port.

[0015] As a preferred embodiment of the present application, a partition plate is provided between the lower channel and the upper channel, and the pressing port and the guide portion are provided on the partition plate.

[0016] As a preferred embodiment of the present application, a plurality of first locking openings are arranged on the surface of the sand drum column, and connected second locking openings are arranged on both sides of the push-pull member. The tensioning sand drum also includes a locking member, which can pass through the first locking opening and the second locking opening.

[0017] As a preferred embodiment of the present application, a stepped portion is provided on the edge of the mounting opening, the outer edge of the stepped portion is flush with the top and bottom walls of the sand drum column, and the edge of one side of the tensioning plate with an arc-shaped protrusion is provided with a concave structure in contact with the outer edge of the stepped portion.

[0018] Due to the adoption of the above technical solution, the technical effects achieved by this application are:

[0019] 1. The present application provides a tensioning sand drum for abrasive tools. Through the cooperation between the tensioning assembly and the driving assembly, the tensioning area of ​​the tensioning sand drum is enlarged, which can not only increase the tensioning support force of the annular sand belt by expanding outward, but also change the size of the tensioning area by adjusting the driving assembly, so as to facilitate the disassembly and assembly of the sand belt, reduce the meaningless physical exertion during installation and disassembly, and facilitate the operation and use by the user. Among them, by setting a plurality of installation ports, it is possible to set a plurality of tensioning plates, thereby increasing the contact area between the tensioning sand drum and the inside of the annular sand belt, reducing the relative sliding between the two and improving the supporting capacity of the annular sand belt; and by setting a plurality of movable rods and connecting the push-pull member with the movable rod, the push-pull member drives the entire tensioning assembly to perform the tensioning action, which is convenient for operation; furthermore, the setting of the elastic member can play a buffering role, reduce the impact caused by the tensioning plate contacting the grinded object during grinding work, and improve the reliability during use.

[0020] 2. As a preferred embodiment of the present application, the present application can better ensure the synchronous movement between all movable rods by setting multiple connecting rods between adjacent movable rods, and by setting the elastic member as a tension spring, on the one hand, the staff can exert elastic force when pushing the push-pull member, thereby optimizing the operational feel, and on the other hand, the stretched tension spring can withstand a higher reverse impact, further improving the support effect on the annular sanding belt and reducing the impact; in addition, the avoidance groove between the pulling holes can facilitate the passage of the connecting rod, thereby reducing the obstruction to the tensioning assembly when extending and retracting.

[0021] 3. As a preferred embodiment of the present application, the present application facilitates the movement of the pushing member by setting a slideway, thereby facilitating the pushing and pulling of the tensioning plate. In addition, the push-pull member is set as a button structure, and a slideway including an upper channel and a lower channel is provided to cooperate with the upper pressing part and the lower guiding part of the push-pull member, which not only enables the push-pull member to move, but also can be locked by a pressing operation, thereby further improving the reliability of use.

[0022] 4. As a preferred embodiment of the present application, the present application sets a multi-stage segmented movable structure and sets a pressing port under each multi-stage segmented scale, so that when adjusting the tensioning degree of the tensioning assembly, each pushing member can be adjusted to the same multi-stage segmented scale, further increasing the extension length of each tensioning plate, further ensuring the tensioning effect, and, by setting the lower guide part as a wing-shaped structure, the movement of the pushing member can be smoother, and when it does not reach the pressing port, it can be blocked by the partition plate, thereby reducing the deviation and accidental pop-up of the pushing member; further, by setting a guide area at the pressing port, the lower guide part can be easily pressed by the pushing member to leave the lower channel at the pressing port, which makes the operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present application and do not constitute an improper limitation on the present invention. In the drawings:

[0024] Figure 1 A schematic diagram of the overall structure of a tensioning sand drum for abrasive tools provided in this application;

[0025] Figure 2 A schematic diagram of a partial action structure of a tensioning sand drum for abrasive tools provided in the present application;

[0026] Figure 3 A schematic diagram of a top view of a tensioning sand drum for abrasive tools provided in the present application;

[0027] Figure 4 A schematic diagram of the push-pull structure of a tensioning sand drum for a grinding tool provided in this application.

[0028] Reference numerals:

[0029] 10-sand drum column; 11 installation port; 12 pull-out hole; 13 slideway; 131 upper channel; 132 lower channel; 14 pressing port; 15 multi-level segmented scale; 16 step portion;

[0030] 20 tensioning assembly; 21 tensioning plate; 22 movable rod; 23 elastic member; 24 connecting rod;

[0031] 30 Push-pull member; 31 Upper pressing portion; 32 Lower guiding portion; 33 Wing-shaped structure; 34 Pressing rod. DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0034] In addition, in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0037] like Figures 1 to 4 As shown, the present application provides a tensioning sand drum for abrasive tools, the tensioning sand drum comprising a sand drum column 10, a tensioning assembly 20 and a push-pull member 30, the side wall of the sand drum column 10 is provided with a plurality of mounting openings 11, the tensioning assembly 20 comprises a tensioning plate 21, a movable rod 22 and an elastic member 23, a plurality of pull-out holes 12 are arranged inside the mounting opening 11 along the height direction of the sand drum column 10, the movable rod 22 is slidably arranged in the pull-out hole 12, an arc-shaped protrusion is arranged on one side of the tensioning plate 21, and the movable rod 22 is fixedly connected to the other side and can cover the mounting opening 11, the surface of the movable rod 22 is sleeved with an elastic member 23, the top and bottom of the sand drum column 10 are provided with push-pull members 30, and the push-pull members 30 are connected to the movable rod 22.

[0038] Among them, Figure 1 and Figure 3 As shown, the sand drum column 10 is generally cylindrical in structure, and the arc-shaped protrusion of the tensioning plate 21 is the same as the curvature of the cylindrical side wall of the sand drum column 10. In addition, in order to further improve the supporting effect and the flatness of the support after the annular sanding belt is sleeved, and to reduce the wrinkles and depressions after the sanding belt is sleeved, the spacing between the mounting openings 11 can be set as small as possible, so that the tensioning plate 21 can be compact when tightened, thereby improving the grinding effect.

[0039] In an alternative embodiment, if Figure 1As shown, push-pull members 30 are provided at the top and bottom of the sand drum column 10. On the one hand, it is convenient for users to use. On the other hand, due to the length of the sand drum column 10 itself, push-pull members 30 are provided on both sides to facilitate the application of force, so as to facilitate the pushing and retracting of the tensioning plate 21. Moreover, it can be understood that the structure of the push-pull member 30 itself can be long enough, and a depression can be provided on the top thereof to facilitate the pressing of the user's fingers, thereby further improving the use experience.

[0040] Furthermore, the number of movable rods 22 is the same as the number of pulling holes 12, and a plurality of connecting rods 24 are arranged between adjacent movable rods 22. The connecting rods 24 are arranged perpendicularly to the movable rods 22, and a plurality of connecting rods 24 are arranged along the length direction of the movable rods 22. The elastic member 23 is a tension spring.

[0041] For example, in Figure 2 In one embodiment shown, three movable rods 22 and three pull-out holes 12 can be provided at each mounting port 11, and the pull-out holes 12 are evenly arranged in the vertical direction. Three connecting rods 24 can also be provided, which are evenly spaced along the length direction of the movable rod 22, and the tension spring is sleeved on the outside of the movable rod 22, and its two ends can be connected to the back side of the tensioning plate 21 and the inner wall of the end of the pull-out hole 12, respectively.

[0042] It is understandable that the connecting rod 24 can not only serve as a medium to connect adjacent movable rods 22 to ensure the synchronization when adjusting the tensioning plate 21, but also serve as a clamping structure for installing the tension spring to improve the reliability of the elastic member 23 installed on the movable rod 22.

[0043] In addition, an avoidance groove is arranged between adjacent pulling holes 12, and the avoidance groove is arranged corresponding to the connecting rod 24 to ensure the movement of the connecting rod 24. In order to further provide stability for the movement of the push-pull rod and the movement of the tensioning plate 21, the inner wall of the avoidance groove can be provided with a depression, and the side wall of the connecting rod 24 is provided with a protrusion. The cooperation between the protrusion and the depression can achieve a similar slide groove effect, thereby improving the stability of operation.

[0044] As a preferred embodiment of the present application, the top wall and bottom of the sand drum column 10 are provided with slideways 13, which extend along the length direction of the movable rod 22. The number of slideways 13 is the same as the number of mounting openings 11, and the push-pull member 30 is slidably connected to the slideways 13.

[0045] like Figure 2 and Figure 4As shown, the push-pull member 30 is a button, the connecting rod 24 protrudes from the slide 13, the push-pull member 30 is connected to the connecting rod 24 in a button structure, the slide 13 includes an upper channel 131 and a lower channel 132, the upper channel 131 is slidingly connected to the side wall of the push-pull member 30, the lower channel 132 is lower than the upper channel 131 in the vertical direction, the push-pull member 30 includes an upper pressing portion 31 and a lower guiding portion 32, and the lower guiding portion 32 can enter and exit the lower channel 132.

[0046] It should be noted that the upper pressing portion 31 and the lower guiding portion 32 referred to here are actually still the push-pull member 30 as a whole, but the lower guiding portion 32 is mainly used for pushing the tensioning plate 21, the push-pull member 30 is pressed, and the lower guide plate enters the lower channel 132, and is called the lower guiding portion 32, and the upper pressing portion 31 is the portion exposed in the upper slide 13 after being pressed.

[0047] Furthermore, the button structure of the push-pull member 30 can be configured such that the push-pull member 30 also includes a pressing rod 34, one end of which is connected to the center of the bottom wall of the lower guide portion 32, and the other end is connected to the connecting rod 24, that is, a traditional push-type switch, which sinks when pressed and lifts when pressed again, to realize the pressing action of the push-pull rod, so that the lower guide portion 32 can enter the lower channel 132 or rise and leave the lower channel 132 according to different usage conditions.

[0048] Furthermore, the surface of the slide 13 is provided with a multi-level segmented scale 15, and a pressing port 14 is provided below each level of the multi-level segmented scale 15. The push-pull member 30 can enter and exit the pressing port 14 by pressing. The pressing port 14 is connected to the lower channel 132, and the lower guide part 32 protrudes to both sides as a wing-like structure 33. A guide area guiding to the center of the pressing port 14 is provided below the pressing port 14. In addition, in order to facilitate the movement of the tensioning plate 21, sliding grooves that adapt to the movement of the connecting rod 24 along the length direction should be provided below and above the lower channel 132.

[0049] Alternatively, if Figure 2 As shown, three multi-level segmented scales 15 can be provided at each slide 13, corresponding to three different tensioning degrees. For ease of use, the multi-level segmented scales 15 can be made of luminous material and have a raised structure to facilitate users to confirm the position.

[0050] Specifically, when using Figure 2For example, the position near the center of the sand drum column 10 is the initial state, that is, the tensioning plate 21 is not protruding. The first multi-level segmented scale 15 should avoid the center position, because the center position needs to be connected to the rotating shaft of the abrasive tool for rotation. The second multi-level segmented scale 15 along the outward direction can make the tensioning plate 21 protrude a certain distance to the outside. In this case, the distance from the tensioning plate 21 to the center of the sand drum column 10 is slightly smaller than the diameter of the annular sand belt, which can facilitate the positioning of the annular sand belt while setting it. The third multi-level segmented scale 15 is the last tensioning annular belt. The position of the abrasive belt, at this time, the entire annular abrasive belt can be tightened to complete the installation and positioning, and the surface of the tensioning plate 21 can be provided with a plurality of anti-slip protrusions to increase the friction. In this setting, even due to the tensioning effect, the structure of the annular abrasive belt itself can be made relatively firm, and it is difficult for it to be dented when contacting the object being ground. However, in order to ensure reliability, the relative distances between each multi-stage segmented scale 15 can be set to be not much different, so as to reduce the gap between adjacent tensioning plates 21 when the annular abrasive belt is directly installed, thereby reducing the denting of the annular abrasive belt during use.

[0051] Of course, this is only one embodiment of the structure of the present application. Different settings can also be provided for different situations. For example, in another embodiment, more multi-level segmented scales 15 can be provided so that the tensioning plate 21 can adjust a greater extension distance to fit different annular sanding belts. However, in this case, it is necessary to provide the tensioning sand drum with a rubber ring having ductility and elasticity. Before fitting the generally inelastic annular sanding belt, the rubber ring is first fitted on the surface of the sand drum column 10 to reduce the phenomenon of the annular sanding belt being sunken. It can be understood that the elastic force of the rubber ring should be moderate, so that when the tensioning plate 21 reaches the limit of advancement distance, it can also be easily expanded by hand to improve the user experience.

[0052] Furthermore, a partition plate is arranged between the lower channel 132 and the upper channel 131, and the pressing port 14 and the guide part are arranged on the partition plate, so that the partition plate serves as a movement channel for the lower guide part 32, and the pressing port 14 serves as an inlet and outlet. The setting of the guide part facilitates the wing-like structure 33 of the lower guide part 32 to return to the upper channel 131. Similarly, a guide part may also be arranged at the opening of the pressing port 14 near the upper channel 131, and the angle of the inclined surface thereof is symmetrically arranged below, and the shape of the pressing port 14 should be adapted to the wing-like structure 33 to reduce obstruction to the lower guide part 32.

[0053] That is to say, Figure 1 and Figure 2As shown, when in use, the push-pull member 30 is initially at the very beginning of the multi-level segmented scale 15, that is, the initial state. At this time, the lower guide portion 32 is stuck in the area where the entrance and exit are close to the upper access area, and cannot move along the length direction. When it is necessary to adjust the position of the tensioning plate 21, the push-pull member 30 is pressed so that the lower guide portion 32 falls into the lower channel 132. At this time, the obstruction to the lower guide portion 32 disappears, so that the lower guide portion 32 can move guided by the wing-like structure 33 to ensure smooth movement. When the movement reaches the appropriate multi-level segmented scale 15, the push-pull member 30 is pressed again so that the lower guide portion 32 leaves the lower channel 132 and returns to the guide portion below the upper channel 131. At this time, the lower guide portion 32 has no movable channel and cannot be pushed, thereby playing a role of locking and positioning.

[0054] In a preferred embodiment, a plurality of first locking openings are provided on the surface of the sand drum column 10, and connected second locking openings are provided on both sides of the push-pull member 30. The tensioning sand drum also includes a locking member, which can pass through the first locking opening and the second locking opening.

[0055] like Figure 1 As shown, the first locking port and the second locking port are used for positioning. That is to say, when there is no need to adjust the position and grinding needs to be started, the first locking port and the second locking port can be clamped by the locking member to play a further locking and positioning role. When the annular sanding belt needs to be disassembled or the position of the tensioning plate 21 needs to be adjusted, the locking member can be removed so that the push-pull member 30 can be adjusted and moved normally.

[0056] The connection between the locking member and the first locking opening and the second locking opening can be fixed by bolt connection, the multi-stage segmented scale 15 can be set as a protrusion structure, and the first locking opening can be set as a structure that penetrates the multi-stage segmented scale 15.

[0057] In an alternative embodiment, if Figure 1 and Figure 2 As shown, the edge of the mounting opening 11 is provided with a stepped portion 16, the outer edge of the stepped portion 16 is flush with the top wall and the bottom wall of the sand drum column 10, and the edge of the tensioning plate 21 on one side of the arc-shaped protrusion is provided with a concave structure in contact with the outer edge of the stepped portion 16. The parts not described in this application can be implemented by adopting or drawing on existing technologies.

[0058] The shape and structure of the step portion 16 are as follows: Figure 1 and Figure 3As shown, the structure has a large outer circle and a small inner circle, which can facilitate the installation of a larger tensioning plate 21 while reducing the volume of the entire tensioning plate 21. In other words, the tensioning plate 21 can have an outer side wall with a thinner arc surface structure, and the interior is adapted to the small inner circle, which reduces the force required for pushing the push-pull member 30 to a certain extent and optimizes the operating feel.

[0059] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0060] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A tensioning sand drum for abrasive tools, characterized in that: The tensioning sand drum includes a sand drum column, a tensioning assembly and a push-pull piece. The side wall of the sand drum column is provided with a plurality of installation openings. The tensioning assembly includes a tensioning plate, a movable rod and an elastic piece. A plurality of pull-out holes are arranged inside the installation opening along the height direction of the sand drum column. The movable rod is slidably arranged in the pull-out hole. An arc-shaped protrusion is arranged on one side of the tensioning plate, and the movable rod is fixedly connected to the other side and can cover the installation opening. An elastic piece is sleeved on the surface of the movable rod. A push-pull piece is arranged on the top and / or bottom of the sand drum column, and the push-pull piece is connected to the movable rod.

2. A tensioning sand drum for abrasive tools as claimed in claim 1, characterized in that: The number of the movable rods is the same as the number of the pulling holes. A plurality of connecting rods are arranged between adjacent movable rods. The connecting rods are arranged perpendicularly to the movable rods and are arranged along the length direction of the movable rods. The elastic member is a tension spring.

3. A tensioning sand drum for abrasive tools as claimed in claim 2, characterized in that: An avoidance groove is arranged between adjacent pulling holes, and the avoidance groove is arranged corresponding to the connecting rod.

4. A tensioning sand drum for abrasive tools as claimed in claim 3, characterized in that: The top wall and / or bottom of the sand drum column is provided with a slideway, and the slideway extends along the length direction of the movable rod. The number of the slideways is the same as the number of the mounting openings, and the push-pull member is slidably connected to the slideway.

5. A tensioning sand drum for abrasive tools as claimed in claim 4, characterized in that: The push-pull member is a button, the connecting rod protrudes from the slide, the push-pull member and the connecting rod are connected in a button structure, the slide includes an upper channel and a lower channel, the upper channel is slidably connected to the side wall of the push-pull member, the lower channel is lower than the upper channel in the vertical direction, the push-pull member includes an upper pressing portion and a lower guiding portion, and the lower guiding portion can enter and exit the lower channel.

6. A tensioning sand drum for abrasive tools as claimed in claim 5, characterized in that: The push-pull member further comprises a pressing rod, one end of which is connected to the center of the bottom wall of the lower guide portion, and the other end of which is connected to the connecting rod.

7. A tensioning sand drum for abrasive tools as claimed in claim 5, characterized in that: The surface of the slide is provided with a multi-level segmented scale, and a pressing port is provided below each level of the multi-level segmented scale. The push-pull member can enter and exit the pressing port by pressing, and the pressing port is connected to the lower channel. The lower guide part protrudes to both sides as a wing-like structure, and a guide area guiding to the center of the pressing port is provided below the pressing port.

8. A tensioning sand drum for abrasive tools as claimed in claim 7, characterized in that: A partition plate is provided between the lower channel and the upper channel, and the pressing port and the guide portion are provided on the partition plate.

9. The tensioning sand drum for abrasive tools as claimed in claim 1, characterized in that: The surface of the sand drum column is provided with a plurality of first locking openings, and the two sides of the push-pull member are provided with communicating second locking openings. The tensioning sand drum further comprises a locking member, and the locking member can pass through the first locking opening and the second locking opening.

10. The tensioning sand drum for abrasive tools according to claim 1, characterized in that: The edge of the mounting opening is provided with a stepped portion, the outer edge of the stepped portion is flush with the top wall and the bottom wall of the sand drum column, and the edge of one side of the tensioning plate provided with an arc-shaped protrusion is provided with a concave structure in contact with the outer edge of the stepped portion.

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