Protective cover and straight grinder

Abstract

The utility model provides a protective cover and a straight grinding machine, the protective cover includes a protective cover body, a cover plate, and a locking member. An accommodating cavity is formed inside the protective cover body, an opening connected to the accommodating cavity is provided on the protective cover body, and a limiting portion is provided on the protective cover body; the cover plate can be rotatably arranged at the opening; the locking member can be movably arranged on the cover plate, and the locking member is provided with a matching portion; when the protective cover is in a locked state, the matching portion forms a limiting match with the limiting portion; when the protective cover is in an unlocked state, the locking member is in a disengaged position, and the matching portion is disengaged from the limiting portion. When the grinding wheel needs to be replaced, the protective cover is switched to the unlocked state through the movable locking member. At this time, the cover plate is rotated to open the opening of the protective cover body, so that the grinding wheel in the protective cover body can be replaced more conveniently. After the grinding wheel is replaced, the cover plate is rotated to close the opening of the protective cover body and the locking member is movable to switch the protective cover back to the locked state.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, and in particular to a protective cover and a straight grinder. Background Art

[0002] A straight grinder usually includes a motor, a grinding wheel driven by the motor, and a fixed cover and a movable cover surrounding the grinding wheel. The cooperation of the fixed cover and the movable cover ensures the safety of the operator to the greatest extent. However, this design also makes it extremely cumbersome to replace the grinding wheel of a straight grinder. The operator needs to first rotate the movable cover to a suitable position and keep the movable cover from rotating. Then, the operator needs to remove the connecting plate used to connect the movable cover and the fixed cover and manually rotate the connecting plate to expose the tool shaft that passes through the grinding wheel. Then, the tool shaft is loosened to disassemble and assemble the grinding wheel. The disassembly and assembly process is complicated, unfriendly to operators, and has low work efficiency. Utility Model Content

[0003] The purpose of the embodiments of the utility model is to provide a protective cover and a straight grinder, aiming to solve the problem that the protective cover structure of the existing straight grinder makes the replacement of the grinding wheel extremely complicated.

[0004] In order to solve the above technical problems, the embodiment of the utility model provides a protective cover, including:

[0005] A protective cover body, wherein a receiving cavity is formed inside the protective cover body, and the receiving cavity is used to receive one end of a grinding wheel. The protective cover body is provided with an opening connected to the receiving cavity, so that the grinding wheel in the receiving cavity can be exposed from the opening, and a limiting portion is provided on the protective cover body;

[0006] a cover plate, the cover plate being rotatably disposed at the opening so as to open and close the opening;

[0007] A locking member, the locking member can be movably arranged on the cover plate, and the locking member is provided with a matching portion;

[0008] Wherein, when the protective cover is in a locked state, the cover plate closes the opening, the locking member is located at a limiting position, and the matching portion forms a limiting match with the limiting portion to limit the rotation of the cover plate;

[0009] When the protective cover is in the unlocked state, the locking member is located at the disengaged position, and the matching portion is disengaged from the limiting portion, so that the cover plate can be rotated to open the opening.

[0010] The protective cover of the utility model is in a locked state under normal circumstances. When the grinding wheel needs to be replaced, the protective cover is switched to an unlocked state through a movable locking piece. At this time, the cover plate is rotated to open the opening of the protective cover body, so that the grinding wheel in the protective cover body can be replaced more conveniently. After the grinding wheel is replaced, the cover plate is rotated to close the opening of the protective cover body and the locking piece is movable to switch the protective cover back to the locked state.

[0011] Preferably, the limiting portion is a limiting hole, and when the locking member is located at the limiting position, the matching portion extends into the limiting hole to form a snap-fit ​​limiting fit.

[0012] Preferably, the cover plate includes a first bottom plate portion and a first peripheral side plate portion, the first peripheral side plate portion is formed by folding and extending from the edge of the first bottom plate portion, and the first peripheral side plate portion can be rotatably arranged on the protective cover body; when the cover plate closes the opening, the first bottom plate portion closes the opening, and the first peripheral side plate portion is arranged around the outside of the protective cover body; the locking piece can be movably arranged on the first peripheral side plate portion.

[0013] Preferably, a through hole is provided on the first circumferential side plate portion corresponding to the locking piece, the locking piece is inserted into the through hole, the locking piece can move along the penetration direction of the through hole relative to the first circumferential side plate portion, and the matching portion is provided at one end of the locking piece located on the inner side of the first circumferential side plate portion.

[0014] Preferably, an annular protrusion is provided on the locking member, and when the locking member is located at the limiting position, the annular protrusion abuts against the outer side of the protective cover body.

[0015] Preferably, a pull bolt is provided at one end of the locking member located on the outer side of the first peripheral side plate portion, and when the locking member is located at the limiting position, the pull bolt abuts against the outer side of the first peripheral side plate portion.

[0016] Preferably, the locking member is a locking pin extending along a penetration direction of the through hole.

[0017] Preferably, a spring is mounted on the locking member, one end of the spring abuts against the annular protrusion, and one end of the spring away from the annular protrusion abuts against the inner side of the first peripheral side plate portion.

[0018] Preferably, the portion of the first peripheral side plate portion provided with the through hole is recessed in a direction away from the first bottom plate portion to form a boss on the outer side surface of the first peripheral side plate portion, and the through hole is provided on the surface of the boss.

[0019] Preferably, the portion of the first peripheral side plate portion where the perforations are provided is widened.

[0020] Preferably, the protective cover body includes a second bottom plate portion and a second peripheral side plate portion, and the second peripheral side plate portion is formed by folding and extending from the edge of the second bottom plate portion to form the accommodating cavity between the second peripheral side plate portion and the second bottom plate portion, and to form the opening opposite to the second bottom plate portion, the limiting portion is arranged on the second peripheral side plate portion, and the cover plate can be rotatably arranged on the second peripheral side plate portion.

[0021] Preferably, the cover plate is rotatably arranged in the middle of the second peripheral side plate portion, two limiting portions are respectively arranged at both ends of the second peripheral side plate portion, and two locking members are arranged corresponding to the two limiting portions.

[0022] Preferably, a rotating shaft is provided on the outer side surface of the second peripheral side plate portion, and a connecting ear rotatably matched with the rotating shaft is provided on the cover plate. When the protective cover is in an open state, the connecting ear abuts against the outer side surface of the second peripheral side plate portion to limit the cover plate from rotating in the direction of opening the opening.

[0023] In order to achieve the above-mentioned purpose, the utility model also provides a straight grinding machine, including the above-mentioned protective cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0025] Figure 1 This is one of the structural schematic diagrams of the protective cover in the embodiment of the utility model, wherein the protective cover is in a locked state;

[0026] Figure 2 for Figure 1 A cross-sectional view of the middle protective cover;

[0027] Figure 3 This is a second structural schematic diagram of the protective cover in the embodiment of the utility model, wherein the protective cover is in an unlocked state;

[0028] Figure 4 for Figure 3 A cross-sectional view of the middle protective cover;

[0029] Figure 5 This is the third structural schematic diagram of the protective cover in the embodiment of the utility model;

[0030] Figure 6 This is the fourth structural schematic diagram of the protective cover in the embodiment of the utility model, wherein the protective cover is in an open state.

[0031] Description of the figures of the utility model:

[0032] Protective cover 100, protective cover body 1, accommodating cavity 11, opening 12, limiting portion 13, limiting hole 13a, second bottom plate portion 14, second peripheral side plate portion 15, rotating shaft 16, mounting hole 17, clamp 18, cover plate 2, first bottom plate portion 21, first peripheral side plate portion 22, through hole 23, boss 24, connecting ear 25, locking piece 3, locking pin 3a, matching portion 31, annular protrusion 32, pull bolt 4, spring 5.

[0033] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0037] The utility model provides a protective cover which can be used in a straight grinding machine. Figures 1 to 6 A preferred embodiment of the protective cover provided by the utility model is shown.

[0038] See also Figures 1 to 6In this embodiment, the protective cover 100 includes a protective cover body 1, a cover plate 2 and a locking member 3.

[0039] See also Figures 1 to 6 A accommodating chamber 11 is formed inside the protective cover body 1, and the accommodating chamber 11 is used to accommodate one end of the grinding wheel. An opening 12 connected to the accommodating chamber 11 is provided on the protective cover body 1, so that the grinding wheel in the accommodating chamber 11 can be exposed from the opening 12, and a limiting portion 13 is provided on the protective cover body 1.

[0040] Specifically, the straight grinder generally includes a grinding wheel, a tool shaft and a housing, and a reduction box is formed at the front end of the housing. The grinding wheel is arranged on the tool shaft, and the protective cover 100 surrounds the grinding wheel and is sleeved on the reduction box.

[0041] The shield body 1 is provided with a mounting hole 17, which is opposite to the opening 12 in the axial direction of the tool shaft, and the shield body 1 is mounted on the gear box through the mounting hole 17. Figures 1 to 6 In this embodiment, a clamp 18 is provided at the mounting hole 17 , and the clamp 18 is used to be clamped on the gear box so that the protective cover body 1 is set on the gear box through the clamp 18 .

[0042] The protective cover body 1 is provided with a receiving cavity 11 and an opening 12. The specific style of the protective cover body 1 can be set according to actual conditions. Figures 1 to 6 In the present embodiment, the protective cover body 1 includes a second bottom plate portion 14 and a second peripheral side plate portion 15 , and the second peripheral side plate portion 15 is formed by folding and extending from the edge of the second bottom plate portion 14 to form a accommodating cavity 11 between the second peripheral side plate portion 15 and the second bottom plate portion 14 , and to form an opening 12 opposite to the second bottom plate portion 14 .

[0043] Specifically, the second bottom plate portion 14 includes a connected straight edge and an arc edge, and the mounting hole 17 is close to the middle of the straight edge of the second bottom plate portion 14. The second circumferential side plate portion 15 is an arc plate, and the second circumferential side plate portion 15 is connected to the arc edge of the second bottom plate portion 14 and is extended along the arc edge of the second bottom plate portion 14. The second circumferential side plate portion 15 is perpendicular or approximately perpendicular to the second bottom plate portion 14. Since the second circumferential side plate portion 15 is connected to the arc edge of the second bottom plate portion 14, the second circumferential side plate portion 15 and the second bottom plate portion 14 enclose a housing cavity 11 and an opening 12, and the housing cavity 11 is located on one side of the second circumferential side plate portion 15 close to the second bottom plate portion 14 (i.e., the inner side of the second circumferential side plate portion 15). The following will take the protective cover body 1 including the second bottom plate portion 14 and the second circumferential side plate portion 15 as an example for introduction.

[0044] A limiting portion 13 is provided on the protective cover body 1. The limiting portion 13 may be provided on the second bottom plate portion 14 or on the second peripheral side plate portion 15. The specific arrangement of the limiting portion 13 will be further described below.

[0045] See also Figures 1 to 6 The cover plate 2 is rotatably disposed at the opening 12 so that the opening 12 can be opened and closed by the cover plate 2 .

[0046] Specifically, the cover plate 2 can be rotated on the protective cover body 1, and the opening 12 of the protective cover body 1 can be opened and closed by rotating the cover plate 2. When the cover plate 2 closes the opening 12 of the protective cover body 1, the protective cover 100 can completely cover one end of the grinding wheel, thereby playing a protective role. When the cover plate 2 opens the opening 12 of the protective cover body 1, the grinding wheel in the accommodating cavity 11 can be completely exposed to the outside from the opening 12, and the grinding wheel in the protective cover body 1 can be replaced more conveniently.

[0047] The shape of the cover plate 2 is usually compatible with the shape of the opening 12, and the specific style of the cover plate 2 can be set according to actual conditions. Figures 1 to 6 In the present embodiment, the cover plate 2 comprises a first bottom plate portion 21 and a first peripheral side plate portion 22. The first peripheral side plate portion 22 is formed by folding and extending from the edge of the first bottom plate portion 21. The first peripheral side plate portion 22 can be rotatably disposed on the protective cover body 1. When the cover plate 2 closes the opening 12, the first bottom plate portion 21 closes the opening 12, and the first peripheral side plate portion 22 is disposed around the outside of the protective cover body 1.

[0048] Specifically, the shape of the first bottom plate portion 21 is compatible with the shape of the opening 12, and the shape of the opening 12 is compatible with the shape of the second bottom plate portion 14, that is, the shape of the first bottom plate portion 21 is compatible with the shape of the second bottom plate portion 14. Therefore, the first bottom plate portion 21 also includes a connected straight edge and an arc edge, and the first peripheral side plate portion 22 is connected to the arc edge of the first bottom plate portion 21 and is extended along the arc edge of the first bottom plate portion 21. The first peripheral side plate portion 22 is an arc plate, and the first peripheral side plate portion 22 is perpendicular or approximately perpendicular to the first bottom plate portion 21. When the cover plate 2 closes the opening 12, the first bottom plate portion 21 closes the opening 12, and the first peripheral side plate portion 22 is arranged around the side of the second peripheral side plate portion 15 away from the second bottom plate portion 14 (that is, the outer side of the second peripheral side plate portion 15). The following will take the cover plate 2 including the first bottom plate portion 21 and the first peripheral side plate portion 22 as an example for introduction.

[0049] The cover plate 2 can be rotatably connected to the protective cover body 1, and the first peripheral side plate 22 or the second peripheral side plate 15 can be rotatably connected to the second peripheral side plate 15; or the first peripheral side plate 22 or the second peripheral side plate 15 can be rotatably connected to the second bottom plate 14. The following will take the first peripheral side plate 22 rotatably connected to the second peripheral side plate 15 as an example.

[0050] Optionally, see Figures 1 to 6 In this embodiment, a rotating shaft 16 is provided on the outer side surface of the second peripheral side plate portion 15, and a connecting ear 25 rotatably matched with the rotating shaft 16 is provided on the cover plate 2. When the protective cover 100 is in an open state, the connecting ear 25 abuts against the outer side surface of the second peripheral side plate portion 15 to limit the cover plate 2 from rotating in the direction of opening the opening 12.

[0051] Specifically, the first peripheral side plate portion 22 and the second peripheral side plate portion 15 are respectively provided with a connecting ear 25 and a rotating shaft 16, and the first peripheral side plate portion 22 and the second peripheral side plate portion 15 are rotatably connected through the rotating shaft 16 and the connecting ear 25. When the cover plate 2 is rotated at a preset angle, the cover plate 2 is completely flipped to the side of the protective cover body 1 away from the mounting hole 17, and the opening 12 of the protective cover body 1 is completely opened. At this time, the connecting ear 25 abuts against the outer side surface of the second peripheral side plate portion 15, which means that the cover plate 2 has been rotated into place. In this way, the cover plate 2 rotated into place can be positioned through the cooperation of the connecting ear 25 and the second peripheral side plate portion 15, wherein the rotating shaft 16 can be a rivet pin or the like.

[0052] See also Figures 1 to 6 The locking member 3 can be movably arranged on the cover plate 2, and the locking member 3 is provided with a matching portion 31; when the protective cover 100 is in a locked state, the cover plate 2 closes the opening 12, the locking member 3 is located at a limiting position, and the matching portion 31 forms a limiting match with the limiting portion 13 to limit the rotation of the cover plate 2; when the protective cover 100 is in an unlocked state, the locking member 3 is located at a disengaged position, and the matching portion 31 is disengaged from the limiting portion 13, so that the cover plate 2 can rotate to open the opening 12.

[0053] Specifically, the shield body 1 is provided with a limiting portion 13, and the cover plate 2 is provided with a locking member 3 corresponding to the limiting portion 13. The limiting portion 13 may be provided on the second bottom plate portion 14, and the locking member 3 may be provided on the first bottom plate portion 21; the limiting portion 13 may be provided on the second bottom plate portion 14, and the locking member 3 may be provided on the first peripheral side plate portion 22; the limiting portion 13 may be provided on the second peripheral side plate portion 15, and the locking member 3 may be provided on the first bottom plate portion 21; the limiting portion 13 may be provided on the second peripheral side plate portion 15, and the locking member 3 may be provided on the first peripheral side plate portion 22. The following will take the limiting portion 13 and the locking member 3 provided on the second peripheral side plate portion 15 and the first peripheral side plate portion 22 as an example for introduction.

[0054] The locking member 3 can be movably arranged on the cover plate 2, so that the locking member 3 has a limit position and a disengagement position within the movable stroke. When the cover plate 2 closes the opening 12, the locking member 3 at the limit position can move to the disengagement position, and the locking member 3 at the disengagement position can also move to the limit position.

[0055] There are many specific movable settings of the locking piece 3. For example, the locking piece 3 can be set on the second peripheral side plate 15 in a flippable manner. When the cover 2 closes the opening 12, the locking piece 3 can be flipped to make the matching portion 31 on the locking piece 3 close to the limiting portion 13 on the first peripheral side plate 22, or the matching portion 31 on the locking piece 3 can be moved away from the limiting portion 13 on the first peripheral side plate 22; the locking piece 3 can also be slidably set on the second peripheral side plate 15. By sliding the locking piece 3, the matching portion 31 on the locking piece 3 can be close to the limiting portion 13 on the first peripheral side plate 22, or the matching portion 31 on the locking piece 3 can be moved away from the limiting portion 13 on the first peripheral side plate 22. The following will take the locking piece 3 slidably set on the second peripheral side plate 15 as an example for introduction.

[0056] When the matching portion 31 and the limiting portion 13 form a limiting match, the cover plate 2 can be limited from rotating to open the opening 12. There are many specific ways to set the limiting match between the matching portion 31 and the limiting portion 13. For example, the matching portion 31 and the limiting portion 13 can be a clamping limiting match, a magnetic limiting match, or a screw limiting match.

[0057] Optionally, see Figures 1 to 6 In this embodiment, the limiting portion 13 is a limiting hole 13a. When the locking member 3 is located at the limiting position, the matching portion 31 extends into the limiting hole 13a to form a snap-fit ​​limiting match.

[0058] Specifically, when the protective cover 100 is in the locked state, the locking member 3 is located at the limiting position, and the matching portion 31 extends into the limiting hole 13a, so that the matching portion 31 and the limiting hole 13a form a snap-fit ​​limiting fit to limit the cover plate 2 from rotating to open the opening 12. When the locking member 3 located at the limiting position is slid to the disengaged position, the matching portion 31 withdraws to the limiting hole 13a, and the snap-fit ​​limiting fit between the matching portion 31 and the limiting hole 13a fails. At this time, the cover plate 2 can be freely rotated to open the opening 12. The following will take the limiting portion 13 as the limiting hole 13a, and the snap-fit ​​limiting fit between the matching portion 31 and the limiting hole 13a as an example for introduction.

[0059] The protective cover 100 of the utility model is in a locked state under normal circumstances. When the grinding wheel needs to be replaced, the protective cover 100 is switched to an unlocked state through the movable locking member 3. At this time, the cover plate 2 is rotated to open the opening 12 of the protective cover body 1, so that the grinding wheel in the protective cover body 1 can be replaced more conveniently. After replacing the grinding wheel, the cover plate 2 is rotated to close the opening 12 of the protective cover body 1 and the movable locking member 3 is used to switch the protective cover 100 back to the locked state.

[0060] As described above, the locking member 3 can be slidably arranged on the second peripheral side plate portion 15. The specific installation method of the locking member 3 on the second peripheral side plate portion 15 can be set according to actual conditions. Figures 1 to 6 In the present embodiment, a through hole 23 is provided on the first peripheral side plate portion 22 corresponding to the locking member 3, and the locking member 3 is inserted into the through hole 23. The locking member 3 can move along the penetration direction of the through hole 23 relative to the first peripheral side plate portion 22, and the matching portion 31 is provided at one end of the locking member 3 located on the inner side of the first peripheral side plate portion 22.

[0061] Specifically, a limiting hole 13a is provided on the outer side surface of the second peripheral side plate portion 15, and the limiting hole 13a may be through the inner side surface of the second peripheral side plate portion 15, or may not be through the inner side surface of the second peripheral side plate portion 15. A through hole 23 is provided on the first peripheral side plate portion 22 corresponding to the limiting hole 13a, and the through hole 23 passes through the inner and outer side surfaces of the first peripheral side plate portion 22.

[0062] The locking member 3 can be inserted into the through hole 23 so as to be slidable along the penetration direction of the through hole 23, and both ends of the locking member 3 extend out of the through hole 23. The end of the locking member 3 located on the outside of the first peripheral side plate portion 22 is defined as the outer end of the locking member 3, and the end of the locking member 3 located on the inside of the first peripheral side plate portion 22 is defined as the inner end of the locking member 3, and the matching portion 31 is provided at the inner end of the locking member 3. The operator can drive the locking member 3 to telescope and slide along the penetration direction of the through hole 23 by pulling the outer end of the locking member 3. The specific style of the locking member 3 may not be specifically limited, for example, refer to Figures 1 to 6 The locking member 3 may be a locking pin 3 a extending along the penetrating direction of the through hole 23 .

[0063] For further information, see Figures 1 to 6 In this embodiment, a pull bolt 4 is provided at one end of the locking member 3 located on the outer side of the first peripheral side plate portion 22 . When the locking member 3 is located at the limiting position, the pull bolt 4 abuts against the outer side of the first peripheral side plate portion 22 .

[0064] Specifically, a pull bolt 4 is provided at the outer end of the locking member 3, and the operator can pull the locking member 3 through the pull bolt 4, so that pulling the locking member 3 becomes more convenient and labor-saving. In addition, the locking member 3 at the limit position can be positioned by the abutment and cooperation between the pull bolt 4 and the first peripheral side plate portion 22.

[0065] Optionally, see Figures 1 to 6 In this embodiment, an annular protrusion 32 is provided on the locking member 3. When the locking member 3 is located at the limiting position, the annular protrusion 32 abuts against the outer side of the protective cover body 1.

[0066] Specifically, an annular protrusion 32 is provided at the inner end of the locking member 3. When the locking member 3 is located at the limiting position, the annular protrusion 32 abuts against the outer edge of the limiting hole 13a. In this way, the locking member 3 located at the limiting position can be positioned through the abutment cooperation between the annular protrusion 32 and the first peripheral side plate portion 22.

[0067] For further information, see Figures 1 to 6 In this embodiment, a spring 5 is mounted on the locking member 3 , one end of the spring 5 abuts against the annular protrusion 32 , and one end of the spring 5 away from the annular protrusion 32 abuts against the inner side of the first peripheral side plate portion 22 .

[0068] Specifically, the locking member 3 at the disengaged position can be automatically slid back to the limit position by the elastic force of the spring 5. When the locking member 3 is at the limit position, the spring 5 is pre-compressed to 30%. When the locking member 3 at the limit position is pulled to slide to the disengaged position, the spring 5 is compressed to 100%. At this time, the locking member 3 is released, and under the elastic force of the spring 5, the locking member 3 can automatically slide back to the limit position.

[0069] Optionally, see Figures 1 to 6 In this embodiment, the portion of the first peripheral side plate portion 22 provided with the through hole 23 is recessed in a direction away from the first bottom plate portion 21 to form a boss 24 on the outer surface of the first peripheral side plate portion 22, and the through hole 23 is provided on the surface of the boss 24.

[0070] Specifically, the boss 24 is formed on the first peripheral side plate portion 22 in the direction of the depression, which is beneficial to reserve sufficient movable space for the locking member 3 between the first peripheral side plate portion 22 and the second peripheral side plate portion 15 .

[0071] Optionally, see Figures 1 to 6 In this embodiment, the portion of the first peripheral side plate portion 22 provided with the through hole 23 is widened.

[0072] Specifically, by widening the installation position of the locking member 3 on the first peripheral side plate portion 22, it is not only beneficial to set the installation structure of the locking member 3 on the first peripheral side plate portion 22, but also can improve the structural strength of the installation position of the locking member 3 on the first peripheral side plate portion 22.

[0073] The locking member 3 and the limiting portion 13 are usually provided in a plurality of corresponding positions along the circumference of the opening 12. Figures 1 to 6 In this embodiment, the cover plate 2 is rotatably disposed in the middle of the second peripheral side plate portion 15 , two limiting portions 13 are respectively disposed at both ends of the second peripheral side plate portion 15 , and two locking members 3 are disposed corresponding to the two limiting portions 13 .

[0074] Specifically, if only pulling the pull bolt 4 on one locking member 3 is sufficient to achieve release, it is necessary to pull the pull bolts 4 on both locking members 3 to the left and right at the same time to achieve rapid reverse release. This setting is a safety guarantee to prevent accidental touch.

[0075] The utility model also provides a straight grinding wheel machine, which comprises a protective cover. Since the protective cover adopts the technical solution of the above embodiment, it has the beneficial effects brought by the technical solution of the above embodiment.

[0076] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A protective cover, characterized in that: include: A protective cover body, wherein a receiving cavity is formed inside the protective cover body, and the receiving cavity is used to receive one end of a grinding wheel. The protective cover body is provided with an opening connected to the receiving cavity, so that the grinding wheel in the receiving cavity can be exposed from the opening, and a limiting portion is provided on the protective cover body; a cover plate, the cover plate being rotatably disposed at the opening so as to open and close the opening; A locking member, the locking member can be movably arranged on the cover plate, and the locking member is provided with a matching portion; Wherein, when the protective cover is in a locked state, the cover plate closes the opening, the locking member is located at a limiting position, and the matching portion forms a limiting match with the limiting portion to limit the rotation of the cover plate; When the protective cover is in the unlocked state, the locking member is located at the disengaged position, and the matching portion is disengaged from the limiting portion, so that the cover plate can be rotated to open the opening.

2. The protective cover according to claim 1, characterized in that The limiting portion is a limiting hole. When the locking member is located at the limiting position, the matching portion extends into the limiting hole to form a clamping limiting match.

3. The protective cover according to claim 1, characterized in that: The cover plate includes a first bottom plate portion and a first peripheral side plate portion, the first peripheral side plate portion is formed by folding and extending from the edge of the first bottom plate portion, and the first peripheral side plate portion can be rotatably arranged on the protective cover body; when the cover plate closes the opening, the first bottom plate portion closes the opening, and the first peripheral side plate portion is arranged around the outside of the protective cover body; the locking piece can be movably arranged on the first peripheral side plate portion.

4. The protective cover according to claim 3, characterized in that: A through hole is provided on the first peripheral side plate portion corresponding to the locking piece, and the locking piece is inserted into the through hole. The locking piece can move along the penetration direction of the through hole relative to the first peripheral side plate portion, and the matching portion is provided at one end of the locking piece located on the inner side of the first peripheral side plate portion.

5. The protective cover according to claim 4, characterized in that: The locking member is provided with an annular protrusion, and when the locking member is located at the limiting position, the annular protrusion abuts against the outer side of the protective cover body; and / or, A pull bolt is provided at one end of the locking member located on the outer side of the first peripheral side plate, and when the locking member is located at the limiting position, the pull bolt abuts against the outer side of the first peripheral side plate; and / or, The locking member is a locking pin extending along a penetrating direction of the through hole.

6. The protective cover according to claim 5, characterized in that A spring is sleeved on the locking member, one end of the spring abuts against the annular protrusion, and one end of the spring away from the annular protrusion abuts against the inner side of the first peripheral side plate portion.

7. The protective cover according to claim 4, characterized in that: The portion of the first peripheral side plate portion provided with the through hole is recessed in a direction away from the first bottom plate portion to form a boss on the outer side surface of the first peripheral side plate portion, and the through hole is provided on the boss surface; and / or, The portion of the first peripheral side plate portion where the through hole is provided is widened.

8. The protective cover according to any one of claims 1 to 7, characterized in that: The protective cover body includes a second bottom plate portion and a second peripheral side plate portion, and the second peripheral side plate portion is folded and extended from the edge of the second bottom plate portion to form the accommodating cavity between the second peripheral side plate portion and the second bottom plate portion, and to form the opening opposite to the second bottom plate portion, the limiting portion is arranged on the second peripheral side plate portion, and the cover plate can be rotatably arranged on the second peripheral side plate portion.

9. The protective cover according to claim 8, characterized in that The cover plate is rotatably arranged at the middle part of the second peripheral side plate, two limiting parts are respectively arranged at both ends of the second peripheral side plate, and two locking members are arranged corresponding to the two limiting parts; and / or, A rotating shaft is arranged on the outer side surface of the second peripheral side plate portion, and a connecting ear rotatably matched with the rotating shaft is arranged on the cover plate. When the protective cover is in an open state, the connecting ear abuts against the outer side surface of the second peripheral side plate portion to limit the cover plate from rotating in the direction of opening the opening.

10. A straight grinding machine, characterized in that: Comprising the protective cover as described in any one of claims 1-9.

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