Guard assembly for linear guideway grinder

Abstract

The application provides a protection assembly of a linear guide rail grinding machine, and belongs to the technical field of grinding machine equipment. The protection assembly of the linear guide rail grinding machine comprises an outer end shell arranged at the end of a bed body in an inverted U shape, the outer end of the outer end shell is closed and the inner end is open, an inner end shell in an inverted U shape with open ends is arranged between the bed body and a grinding device cover, a common rail double sliding door unit is arranged between the outer end shell and the inner end shell, and one end of the grinding device cover is covered by the bed body, the inner end shell, the common rail double sliding door unit and the outer end shell. The application has the advantages of good protection effect, strong wrapping property, high safety and the like.

Description

Technical Field

[0001] This invention belongs to the technical field of grinding machine processing equipment, and in particular relates to a protective component for a linear guide grinding machine. Background Technology

[0002] Linear grinders, as high-precision machining equipment, are widely used for grinding surfaces or contours of workpieces. During the grinding process, to prevent damage to operators from splashing grinding fluid, metal chips, etc., and to maintain a clean machining environment, protective components to shield against splashes are usually installed around the worktable.

[0003] Currently, most traditional protective doors are single-leaf sliding or flip-up structures, which occupy a large space when opened, affecting operational convenience. Furthermore, the protective components typically only partially obstruct the workbench, or the joints between the components are not tight, easily creating gaps and resulting in poor sealing.

[0004] To ensure effective protection, multi-door structures are sometimes used. However, each protective door requires a separate slide rail support, resulting in poor compactness and complex structure. Multi-rail systems also require more sliding modules and connectors, leading to poor sliding stability and high maintenance and installation costs. Therefore, a protective component for linear guideway grinding machines that can solve the above problems is needed. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a protective component for a linear guideway grinding machine with stronger overall sealing and better anti-splash effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The protective assembly of this linear guide grinding machine includes an inverted U-shaped outer end shell disposed at the end of the bed, with the outer end of the outer end shell closing the inner end opening; an inverted U-shaped inner end shell with openings at both ends is disposed between the bed and the grinding device cover; a common track double sliding door unit is disposed between the outer end shell and the inner end shell; the worktable at one end of the grinding device cover is covered by the bed, the inner end shell, the common track double sliding door unit and the outer end shell.

[0007] The combination of the outer and inner end shells with the double sliding door unit forms a continuous and complete protective enclosure structure, effectively isolating the workbench area, providing excellent splash protection and strong sealing. Simultaneously, the shared-track double sliding door design allows the two protective doors to overlap and move on the same track, saving operating space and facilitating operation.

[0008] In the aforementioned protective assembly of the linear guideway grinding machine, the shared-rail double sliding door unit includes a first protective door and a second protective door with an inverted U-shaped vertical cross-section. The first and second protective doors are stacked and can move axially along the grinding machine's worktable until they overlap. The sides of the first and second protective doors are slidably connected to a protective door slide rail on the same side via a shared-rail sliding mechanism, allowing the first and second protective doors to slide independently and overlap on the protective door slide rail. The protective door slide rail is fixed to the machine bed. This design, where two protective doors share the same slide rail, avoids gaps between door panels while reducing the space occupied by the protective structure in the width direction, thus improving overall operational convenience.

[0009] In the protective assembly of the aforementioned linear guide grinding machine, the common rail sliding mechanism includes a clearance portion disposed on the side of the first protective door to provide axial space for the connection between the second protective door and the protective door slide rail. Within the clearance portion is a first sliding module capable of axially sliding on the protective door slide rail. The first protective door is fixedly connected to the first sliding module, and the second protective door is slidably connected to the protective door slide rail via a second sliding module. By providing the clearance portion on the side of the first protective door, the connection points of the two doors, while sharing the same physical guide rail, will not collide in axial space, achieving a staggered layout in three-dimensional space.

[0010] In the aforementioned protective assembly of the linear guide grinding machine, the clearance portion includes a clearance groove disposed on the side of the first protective door and extending axially along the slide rail of the protective door. At least a portion of the first sliding module is disposed within the clearance groove. This placement of at least a portion of the first sliding module within the clearance groove is an embedded installation method. This ensures that, in the closed state, the first and second protective doors always partially overlap axially, thereby ensuring a sealing effect.

[0011] In the protective assembly of the aforementioned linear guide grinding machine, the second sliding module is located at the inner end of the side of the second protective door, and a second auxiliary sliding module is provided at the outer end of the second protective door on the same side, which is slidably connected to the protective door slide rail. An inner protective plate, fixedly connected to the side of the second protective door, is provided inside the second sliding module and the second auxiliary sliding module. The clearance groove is formed between the second sliding module, the second auxiliary sliding module, the second protective door, the protective door slide rail, and the inner protective plate. The clearance groove is an axially extending space enclosed by the second sliding module, the second auxiliary sliding module, the inner protective plate, and the main body of the second protective door, providing conditions for the first sliding module to move on the protective door slide rail.

[0012] In the protective assembly of the linear guide grinding machine described above, the first sliding module is located at the inner end of the side of the first protective door, and the outer end of the first protective door on the same side is provided with a first auxiliary sliding module that is slidably connected to the slide rail of the protective door; the bottom of the side of the first protective door is connected to the first sliding module through a slider connector. The first sliding module, the second sliding module, the first auxiliary sliding module, and the second auxiliary sliding module are connected to the axial sliding and circumferential limiting of the protective door slide rail; The bottom side of the first protective door is fixed with an outer protective plate located outside the protective door slide rail. The design of axial sliding and circumferential limiting connection allows the protective door slide rail to not only withstand the vertical downward gravity of the protective door, but also effectively resist the overturning moment caused by door shaking or external impact, ensuring stable operation.

[0013] In the aforementioned protective assembly of the linear guide grinding machine, a first labyrinth-type protective structure is provided between the outer end of the first protective door and the outer end of the inner end shell, and a second labyrinth-type protective structure is provided between the outer end of the second protective door and the outer end shell. A rubber sealing strip is provided between the first protective door and the second protective door. The first labyrinth-type protective structure and the second labyrinth-type protective structure solve the sealing problem of the static joint between the inner end shell and the outer end shell and the first and second protective doors.

[0014] In the aforementioned protective assembly of the linear guide grinding machine, the first labyrinth-type protective structure includes a first inner protective edge with a hook-shaped longitudinal section disposed on the outer end of the inner end shell, and a first outer protective edge with an L-shaped longitudinal section facing inward disposed on the outer end of the first protective door. The hook of the first inner protective edge is close to but does not contact the first outer protective edge, and the length of the first inner protective edge along the machine bed axial direction is greater than the length of the first outer protective edge along the machine bed axial direction. The hook-shaped first inner protective edge and the L-shaped first outer protective edge are nested together, forming a tortuous channel with a very small gap. When grinding dust and oil mist attempt to escape through this gap, they must change their direction of movement multiple times, and their kinetic energy is continuously consumed, ultimately failing to pass through the gap and being effectively blocked inside the protection.

[0015] In the aforementioned protective assembly of the linear guide grinding machine, the second labyrinth-type protective structure includes an inverted U-shaped end plate disposed on the inner end of the outer end housing. The inverted U-shaped end plate has a groove into which the end of the second protective door can be inserted. The end of the second protective door has a second outer protective edge with an L-shaped longitudinal section. Through the insertion and engagement of the inverted U-shaped end plate groove and the L-shaped second outer protective edge, a three-sided, structurally robust seal is created, resulting in stronger guiding stability and suitability for boundary sealing on the outer side of the protective system.

[0016] In the protective assembly of the aforementioned linear guide grinding machine, the grinding device housing is provided with a first negative pressure port, and the outer and inner end shells are respectively provided with a second and a third negative pressure port. The first, second, and third negative pressure ports are connected in parallel on a connecting pipe to a negative pressure purifier. The grinding device housing is also provided with an air intake assembly. The negative pressure purifier actively captures and removes dust, oil mist, and other pollutants generated during grinding before they diffuse. A directional airflow from the air intake to the negative pressure port is formed inside the protective housing, further preventing the escape of pollutants.

[0017] Compared with existing technologies, the protective components of this linear guide grinding machine have the following advantages: 1. Dual-door common rail design, compact structure for easy operation. 2. Equipped with an active purification mechanism for proactive control of contaminants. 3. Non-contact labyrinth seal design to avoid friction and wear, resulting in a long service life. 4. Complete protective enclosure design, achieving full enclosed protection for the worktable area. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure provided by the present invention.

[0019] Figure 2 This is a schematic diagram of the structure from another angle provided by the present invention.

[0020] Figure 3 This is a top view structural diagram provided by the present invention.

[0021] Figure 4 This invention provides Figure 3 Schematic diagram of the cross-sectional structure at point hh.

[0022] Figure 5 This is a schematic diagram of the side structure provided by the present invention.

[0023] Figure 6 This invention provides Figure 5 Schematic diagram of the cross-sectional structure at point dd.

[0024] Figure 7 This invention provides Figure 6 Enlarged structural diagram at point F.

[0025] Figure 8 This invention provides Figure 6 Enlarged structural diagram of point G in the middle.

[0026] Figure 9 This invention provides Figure 5 Schematic diagram of the cross-sectional structure at the middle ee section.

[0027] Figure 10 This invention provides Figure 9Enlarged structural diagram at point C.

[0028] Figure 11 This is a schematic diagram of the internal structure provided by the present invention.

[0029] Figure 12 This invention provides Figure 11 Enlarged structural diagram of point B in the middle.

[0030] Figure 13 This is a schematic diagram of the first protective door structure provided by the present invention.

[0031] Figure 14 This is a schematic diagram of the second protective door provided by the present invention.

[0032] Figure 15 This invention provides Figure 14 Enlarged structural diagram at point A in the middle.

[0033] In the figure, the components are: bed 1, outer end shell 11, third negative pressure port 111, grinding device cover 12, first negative pressure port 121, inner end shell 13, second negative pressure port 131, worktable 14, common track double sliding door unit 2, first protective door 21, clearance part 211, first sliding module 212, clearance groove 213, first auxiliary sliding module 214, slider connector 215, outer protective plate 216, first protective door handle 217, second protective door 22, second sliding module 221, second auxiliary sliding module 222, inner protective plate 223, and second protective door handle 22. 4. Common rail sliding mechanism 23, protective door slide rail 231, slide seat 232, pulley 233, first labyrinth-type protective structure 24, first inner protective edge 241, first outer protective edge 242, second labyrinth-type protective structure 25, inverted U-shaped end plate 251, groove 252, second outer protective edge 253, rubber sealing strip 26, negative pressure purifier 3, connecting pipe 31, main pipe 32, first connecting pipe 321, second connecting pipe 322, third connecting pipe 323, negative pressure pipe 33, air intake assembly 4, external air supply pipe 41, air inlet 42, air filter 43. Detailed Implementation

[0034] like Figures 1 to 15 As shown, the protective assembly of this linear guide grinding machine includes an inverted U-shaped outer end shell 11 located at the end of the bed 1, with the outer end of the outer end shell 11 closing the inner end opening. An inverted U-shaped inner end shell 13 with openings at both ends is provided between the bed 1 and the grinding device cover 12. A common track double sliding door unit 2 is provided between the outer end shell 11 and the inner end shell 13. The worktable 14 at one end of the grinding device cover 12 is covered by the bed 1, the inner end shell 13, the common track double sliding door unit 2, and the outer end shell 11.

[0035] In this embodiment, the outer end shell 11 and the inner end shell 13 are respectively positioned above both ends of the worktable 14. When closed, the common track double sliding door unit 2 is positioned directly above the worktable 14 and is tightly fitted to the outer end shell 11 and the inner end shell 13 at both ends. The bed 1 covers the sides and bottom of the worktable 14. This forms a fully enclosed, highly sealed protective structure, effectively isolating the worktable 14 area and providing better protection.

[0036] More specifically, the common track double sliding door unit 2 includes a first protective door 21 and a second protective door 22 with an inverted U-shaped vertical cross section. The first protective door 21 and the second protective door 22 are stacked and can move along the axial direction of the grinding machine worktable 14 to overlap each other. The sides of the first protective door 21 and the second protective door 22 are slidably connected to a protective door slide rail 231 on the same side through a common track sliding mechanism 23, so that the first protective door 21 and the second protective door 22 can slide independently and overlap on the protective door slide rail 231. The protective door slide rail 231 is fixed on the machine bed 1.

[0037] In this embodiment, the first protective door 21 and the second protective door 22 are respectively arranged overlappingly on the protective door slide rails 231 on both sides. They are set on the same track and can move freely on the protective door slide rails 231. This achieves the effects of saving installation space, improving overall durability, and enhancing protective capabilities.

[0038] More specifically, the common rail sliding mechanism 23 includes a clearance part 211 disposed on the side of the first protective door 21 to provide axial space for the connection between the second protective door 22 and the protective door slide rail 231. The clearance part 211 is provided with a first sliding module 212 that can slide axially on the protective door slide rail 231. The first protective door 21 is fixedly connected to the first sliding module 212, and the second protective door 22 is slidably connected to the protective door slide rail 231 through the second sliding module 221.

[0039] In this embodiment, the first protective door 21 and the second protective door 22 are slidably connected to a protective door slide rail 231 on the same side via a common track sliding mechanism 23.

[0040] More specifically, the clearance part 211 includes a clearance groove 213 disposed on the side of the first protective door 21 and extending axially along the protective door slide rail 231, and at least a portion of the first sliding module 212 is disposed in the clearance groove 213.

[0041] More specifically, the second sliding module 221 is located at the inner end of the side of the second protective door 22, and a second auxiliary sliding module 222 is provided at the outer end of the same side of the second protective door 22, which is slidably connected to the protective door slide rail 231. An inner protective plate 223 is provided on the inner side of the second sliding module 221 and the second auxiliary sliding module 222, which is fixedly connected to the side of the second protective door 22. An avoidance groove 213 is formed between the second sliding module 221, the second auxiliary sliding module 222, the second protective door 22, the protective door slide rail 231 and the inner protective plate 223.

[0042] More specifically, the first sliding module 212 is located at the inner end of the side of the first protective door 21, and the outer end of the first protective door 21 on the same side is provided with a first auxiliary sliding module 214 that is slidably connected to the protective door slide rail 231; the bottom of the side of the first protective door 21 is connected to the first sliding module 212 through a slider connector 215. The first sliding module 212, the second sliding module 221, the first auxiliary sliding module 214, and the second auxiliary sliding module 222 are connected to the protective door slide rail 231 for axial sliding and circumferential limiting. The bottom side of the first protective door 21 is fixed with an outer protective plate 216 located outside the protective door slide rail 231.

[0043] In this embodiment, first protective door handles 217 located at both ends of the first protective door 21 are provided on both sides of the first protective door 21, and second protective door handles 224 located at the outer ends of the second protective door 22 are provided on both sides of the second protective door 22.

[0044] More specifically, a first labyrinth-type protective structure 24 is provided between the outer end of the first protective door 21 and the outer end of the inner shell 13, a second labyrinth-type protective structure 25 is provided between the outer end of the second protective door 22 and the outer shell 11, and a rubber sealing strip 26 is provided between the first protective door 21 and the second protective door 22.

[0045] In this embodiment, the height of the second protective door 22 is less than the height of the first protective door 21. The first protective door 21 can be fitted over the outside of the second protective door 22 when sliding. A rubber sealing strip 26 is provided at the top of the first protective door 21 and at the gap between the first protective door 21 and the second protective door 22.

[0046] like Figure 15 As shown, the first sliding module 212, the second sliding module 221, the second auxiliary sliding module 222 and the first auxiliary sliding module 214 include a slide seat 232 that fits tightly with the arc-shaped top surface of the protective door slide rail 231. The bottom of the slide seat 232 is provided with two pairs of pulleys 233 that can slide with the side rails of the protective door slide rail 231 that retract inward.

[0047] In this embodiment, the pulley 233 is connected to the slide block 232 by a bolt passing through the slide block 232. The bolt passes through a bolt hole on the slide block 232 that is inclined to the inner side of the web of the protective door slide rail 231.

[0048] like Figure 7 As shown, the first labyrinth-type protective structure 24 includes a first inner protective edge 241 with a hook-shaped longitudinal section disposed on the outer end of the inner end shell 13, and a first outer protective edge 242 with an L-shaped longitudinal section facing inward disposed on the outer end of the first protective door 21. The hook of the first inner protective edge 241 is close to but does not contact the first outer protective edge 242. The length of the first inner protective edge 241 along the axial direction of the bed 1 is greater than the length of the first outer protective edge 242 along the axial direction of the bed 1.

[0049] like Figure 8 As shown, the second labyrinth-type protective structure 25 includes an inverted U-shaped end plate 251 disposed on the inner end of the outer end shell 11. The inverted U-shaped end plate 251 is provided with a groove 252 that can be inserted into the end of the second protective door 22. The end of the second protective door 22 is provided with a second outer protective edge 253 with an L-shaped longitudinal section.

[0050] More specifically, the grinding device housing 12 is provided with a first negative pressure port 121, and the outer end housing 11 and the inner end housing 13 are respectively provided with a third negative pressure port 111 and a second negative pressure port 131. The first negative pressure port 121, the second negative pressure port 111 and the third negative pressure port 131 are connected in parallel on the connecting pipe 31 and connected to the negative pressure purifier 3. The grinding device housing 12 is also provided with an air intake assembly 4.

[0051] In this embodiment, the air intake assembly 4 includes an external air supply pipe 41 disposed at the end of the grinding device housing 12 away from the first negative pressure port 121 and located on the side of the inner end shell 13. The upper end of the external air supply pipe 41 is connected to the inside of the grinding device housing 12 through two air inlets 42, and the lower end of the external air supply pipe 41 is connected to the bottom air filter 43.

[0052] like Figure 1 and 2 As shown, the connecting pipeline 31 includes a main pipeline 32. A first connecting pipe 321 and a second connecting pipe 322 are connected in parallel at one end of the main pipeline 32. The first connecting pipe 321 and the second connecting pipe 322 are respectively connected to the first negative pressure port 121 and the second negative pressure port 131. The other end of the main pipeline 32 is connected to the third negative pressure port 111 through a third connecting pipe 323. A negative pressure suction pipe 33 is provided between the third connecting pipe 323 and the main pipeline 32, which is connected in parallel to the main pipeline 32. Two negative pressure suction purifiers 3 are connected in parallel on the negative pressure suction pipe 33. The diameter of the negative pressure suction pipe 33 is larger than the diameter of the main pipeline 32. The diameters of the first connecting pipe 321, the second connecting pipe 322, and the third connecting pipe 323 are equal and smaller than the diameter of the main pipeline 32.

[0053] The working principle of this embodiment is that, firstly, the bed 1, inner end shell 13, common track double sliding door unit 2, and outer end shell 11 together form a complete protective enclosure for the worktable 14 and the grinding area. This structure physically isolates the spatter generated during the grinding process.

[0054] In the double sliding door unit 2, the first protective door 21 and the second protective door 22 share the same protective door slide rail 231. Through the shared-rail sliding mechanism 23, the two doors can slide independently. Specifically, the first protective door 21 is connected to the slide rail via a first sliding module 212 within its clearance portion 211, while the second protective door 22 is connected to the same slide rail via a second sliding module 221 and a second auxiliary sliding module 222. This design allows the two doors to move axially to overlap, greatly saving the space required for opening the doors.

[0055] After the protective doors are closed, the joint between the first protective door 21 and the inner end shell 13 is sealed by a first labyrinth-type protective structure 24, wherein the first inner protective edge 241 and the first outer protective edge 242 form a non-contact tortuous channel, effectively blocking contaminants. At the joint between the second protective door 22 and the outer end shell 11, a second labyrinth-type protective structure 25 seals the joint, wherein the second outer protective edge 253 at the end of the second protective door 22 is inserted into the groove 252 of the inverted U-shaped end plate 251, forming a three-sided surround seal. Simultaneously, a rubber sealing strip 26 achieves a contact seal at the joint between the first protective door 21 and the second protective door 22. These three elements together constitute a highly efficient composite sealing system.

[0056] During active purification, external air, after being purified by air filter 43, is delivered into the grinding device housing 12 through external air supply pipe 41 and air inlet 42. Simultaneously, the negative pressure purifier 3 activates, generating negative pressure suction within the grinding device housing 12, inner end shell 13, and outer end shell 11 via connecting pipe system 31, through first negative pressure port 121, second negative pressure port 131, and third negative pressure port 111. This parallel suction system, in conjunction with the air intake, creates a directional airflow from the air intake assembly 4 to each negative pressure port within the protective enclosure. This actively captures and removes dust and oil mist, maintaining cleanliness within the cavity and preventing the intrusion of external contaminants.

[0057] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0058] Although this document frequently uses terms such as bed, outer end shell, third negative pressure port, grinding device cover, first negative pressure port, inner end shell, second negative pressure port, worktable, common track double sliding door unit, first protective door, clearance part, first sliding module, clearance groove, first auxiliary sliding module, slider connector, outer protective plate, first protective door handle, second protective door, second sliding module, second auxiliary sliding module, inner protective plate, second protective door handle, common track sliding mechanism, protective door slide rail, slide seat, pulley, first labyrinth-type protective structure, first inner protective edge, first outer protective edge, second labyrinth-type protective structure, inverted U-shaped end plate, groove, second outer protective edge, rubber sealing strip, negative pressure purifier, connecting pipeline, main pipeline, first connecting pipe, second connecting pipe, third connecting pipe, negative pressure purifier, air intake assembly, external air supply pipe, air inlet, and air filter, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A protective assembly for a linear guide grinding machine, characterized in that, It includes an inverted U-shaped outer end shell (11) set at the end of the bed (1), with the outer end of the outer end shell (11) closing the inner end opening. An inverted U-shaped inner end shell (13) with openings at both ends is provided between the bed (1) and the grinding device cover (12). A common track double sliding door unit (2) is provided between the outer end shell (11) and the inner end shell (13). The worktable (14) at one end of the grinding device cover (12) is covered by the bed (1), the inner end shell (13), the common track double sliding door unit (2) and the outer end shell (11). The common track double sliding door unit (2) includes a first protective door (21) and a second protective door (22) with an inverted U-shaped vertical cross section. The first protective door (21) and the second protective door (22) are stacked and can move along the axial direction of the grinding machine worktable (14) to overlap each other. The sides of the first protective door (21) and the second protective door (22) are slidably connected to a protective door slide rail (231) on the same side through a common track sliding mechanism (23), so that the first protective door (21) and the second protective door (22) can slide independently and overlap on the protective door slide rail (231). The protective door slide rail (231) is fixed on the bed (1). The common rail sliding mechanism (23) includes a clearance part (211) provided on the side of the first protective door (21) for providing axial space for the second protective door (22) to connect with the protective door slide rail (231). A first sliding module (212) capable of axially sliding on the protective door slide rail (231) is provided in the clearance part (211). The first protective door (21) is fixedly connected to the first sliding module (212), and the second protective door (22) is slidably connected to the protective door slide rail (231) through the second sliding module (221). The avoidance part (211) includes an avoidance groove (213) provided on the side of the first protective door (21) and extending axially along the protective door slide rail (231), and at least a portion of the first sliding module (212) is provided in the avoidance groove (213); The second sliding module (221) is located on the inner side of the second protective door (22). On the outer side of the second protective door (22), there is a second auxiliary sliding module (222) that is slidably connected to the protective door slide rail (231). The inner side of the second sliding module (221) and the second auxiliary sliding module (222) is provided with an inner protective plate (223) that is fixedly connected to the side of the second protective door (22). The clearance groove (213) is formed between the second sliding module (221), the second auxiliary sliding module (222), the second protective door (22), the protective door slide rail (231) and the inner protective plate (223).

2. The protective assembly for the linear guide grinding machine according to claim 1, characterized in that, The first sliding module (212) is located on the inner side of the first protective door (21), and the outer side of the first protective door (21) is provided with a first auxiliary sliding module (214) that is slidably connected to the protective door slide rail (231); the bottom side of the first protective door (21) is connected to the first sliding module (212) through a slider connector (215); The first sliding module (212), the second sliding module (221), the first auxiliary sliding module (214), and the second auxiliary sliding module (222) are axially and circumferentially limited connected to the protective door slide rail (231); The first protective door (21) has an outer protective plate (216) fixed at the bottom of its side, located outside the protective door slide rail (231).

3. The protective assembly for the linear guide grinding machine according to claim 1 or 2, characterized in that, A first labyrinth-type protective structure (24) is provided between the outer end of the first protective door (21) and the outer end of the inner shell (13), and a second labyrinth-type protective structure (25) is provided between the outer end of the second protective door (22) and the outer shell (11). A rubber sealing strip (26) is provided between the first protective door (21) and the second protective door (22).

4. The protective assembly for the linear guide grinding machine according to claim 3, characterized in that, The first labyrinth-type protective structure (24) includes a first inner protective edge (241) with a hook-shaped longitudinal section on the outer end of the inner end shell (13), and a first outer protective edge (242) with an L-shaped longitudinal section facing inward on the outer end of the first protective door (21). The hook of the first inner protective edge (241) is close to the first outer protective edge (242) but does not contact it. The length of the first inner protective edge (241) along the axial direction of the bed (1) is greater than the length of the first outer protective edge (242) along the axial direction of the bed (1).

5. The protective assembly for the linear guide grinding machine according to claim 4, characterized in that, The second labyrinth-type protective structure (25) includes an inverted U-shaped end plate (251) disposed on the inner end of the outer end shell (11). The inverted U-shaped end plate (251) is provided with a groove (252) that can be inserted into the end of the second protective door (22). The end of the second protective door (22) is provided with a second outer protective edge (253) with an L-shaped longitudinal section.

6. The protective assembly for a linear guide grinding machine according to claim 1 or 2, characterized in that, The grinding device housing (12) is provided with a first negative pressure port (121), and the outer end shell (11) and inner end shell (13) are respectively provided with a third negative pressure port (111) and a second negative pressure port (131). The first negative pressure port (121), the second negative pressure port (111) and the third negative pressure port (131) are connected in parallel on the connecting pipe (31) and connected to the negative pressure purifier (3). The grinding device housing (12) is also provided with an air intake assembly (4).

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