Plate body fixing device and exhaust cabinet

Abstract

The utility model provides a plate body fixing device and an exhaust cabinet, the plate body fixing device comprises a fixing seat main body, the first end of the fixing seat main body is provided with a fixing seat thread fastening part, the second end of the fixing seat main body is provided with a fixing seat handle thread fastening part, and the end part of the first end of the fixing seat main body is provided with a fixing seat bottom plate; the fixed seat threaded disc is in threaded fit with the fixed seat threaded fastening part, and a first plate body clamping space for clamping the first plate body is formed between the fixed seat threaded disc and the fixed seat bottom plate; and when the fixing seat handle is in threaded fit with the fixing seat handle threaded fastening part, a second plate body clamping space for clamping a second plate body can be formed between the fixing seat handle and the fixing seat clamping shaft shoulder of the fixing seat main body. According to the utility model, the plate body fixing device is respectively fixed with the first plate body and the second plate body by adopting a plate body clamping mode, and compared with a mode of fixing by adopting a plurality of fastening screws in the prior art, the installation can be completed by one person, and the installation efficiency is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of experimental equipment, and particularly relates to a plate fixing device and an exhaust cabinet. Background Art

[0002] Laboratory ventilation is an indispensable part of laboratory design. In order to prevent laboratory workers from inhaling or swallowing some toxic, pathogenic or unknown toxic chemicals and organisms, the laboratory should have good ventilation. In order to prevent the absorption of some vapors, gases and particles (smoke, soot, dust and aerosols), pollutants must be removed by exhaust cabinets, fume hoods or local ventilation.

[0003] The fume hood is the most commonly used local exhaust equipment in the laboratory. Generally speaking, the top of the fume hood is equipped with an exhaust device to exhaust toxic and harmful gases to the outside. A guide plate is set on the front side of the back plate of the fume hood, and an air duct is formed between the guide plate and the back plate, so that toxic and harmful gases are discharged along the corresponding air duct.

[0004] In the prior art, the deflector is fixed to the back plate by a plate fixing device to ensure that there is a corresponding distance between the deflector and the back plate to form an air duct of corresponding width. However, the plate fixing device in the prior art requires two people to install, one person holding the plate fixing device at the front side of the back plate, and the other person installing the fastening screws at the back side of the back plate, which has low installation efficiency.

[0005] Therefore, how to improve installation efficiency is a problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a plate fixing device to improve installation efficiency;

[0007] Another object of the utility model is to provide a fume hood with the above-mentioned plate fixing device.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A plate fixing device, comprising:

[0010] A fixing seat body, wherein the first end of the fixing seat body has a fixing seat threaded fastening portion, the second end has a fixing seat handle threaded fastening portion, and the end of the first end of the fixing seat body has a fixing seat bottom plate;

[0011] A fixing seat screw disk, threadably matched with the fixing seat threaded fastening portion, and forming a first plate clamping space for clamping the first plate with the fixing seat bottom plate;

[0012] A fixed seat handle, when the fixed seat handle is threadedly matched with the fixed seat handle threaded fastening part, a second plate clamping space for clamping the second plate can be formed between the fixed seat handle and the fixed seat clamping shoulder of the fixed seat body.

[0013] Optionally, in the above-mentioned plate fixing device, the fixing seat body is a hollow structure to fix the part to be fixed;

[0014] The end of the second end of the fixing seat body is provided with a plurality of fixing seat avoidance notches extending along the axial direction of the fixing seat body, so as to form a fixing seat elastic clamp between two adjacent fixing seat avoidance notches, and the fixing portion of the to-be-fixed part is inserted into the fixing seat body from the second end of the fixing seat body;

[0015] The fixing seat handle has a tapered hole. When the fixing seat handle is threadedly matched with the fixing seat handle threaded fastening portion, the tapered hole drives the fixing seat elastic clamp to hold the fixing portion of the to-be-fixed component.

[0016] Optionally, in the above-mentioned plate fixing device, in the direction from the end of the second end of the fixing seat body to the first end of the fixing seat body, the fixing seat elastic clamping claw, the fixing seat handle threaded fastening part and the fixing seat clamping shoulder are arranged in sequence.

[0017] Optionally, in the above-mentioned plate fixing device, an extension tube is further included, wherein the first end of the extension tube is used to be fixedly sleeved on the second end of the fixing seat body;

[0018] The second end of the extension tube has an extension tube threaded fastening portion. When the fixing seat handle is threadedly matched with the extension tube threaded fastening portion, a second plate clamping space for clamping the second plate can be formed between the fixing seat handle and the extension tube clamping shoulder of the extension tube.

[0019] Optionally, in the above-mentioned plate fixing device, the fixing seat body and the extension tube are hollow structures to fix the part to be fixed;

[0020] The end of the second end of the extension tube is provided with a plurality of extension tube avoidance notches extending along the axial direction of the extension tube, so as to form an extension tube elastic clamp between two adjacent extension tube avoidance notches, and the fixing portion of the to-be-fixed component is inserted into the extension tube from the second end of the extension tube;

[0021] The fixing seat handle has a tapered hole. When the fixing seat handle is threadedly matched with the threaded fastening portion of the extension tube, the tapered hole drives the elastic clamping claw of the extension tube to hold the fixing portion of the to-be-fixed component.

[0022] Optionally, in the above-mentioned plate fixing device, in the direction from the end of the second end of the extension tube to the first end of the extension tube, the extension tube elastic clamp, the extension tube threaded fastening portion and the extension tube clamping shoulder are arranged in sequence.

[0023] Optionally, in the above-mentioned plate fixing device, a positioning groove penetrating the wall thickness is provided on the extension tube, a positioning protrusion cooperating with the positioning groove is provided on the fixing seat body, and the positioning groove is a groove body with a gradually changing width.

[0024] Optionally, in the above-mentioned plate fixing device, a sliding groove for the positioning protrusion to slide into the positioning groove is provided on the inner wall of the extension tube; and / or,

[0025] An elastic buckle is arranged at the end of the first end of the extension tube, and a clamping groove which is clamped with the elastic buckle is arranged on the fixing seat body.

[0026] Optionally, in the above-mentioned plate fixing device, it further includes a decorative cover snapped on the end hole of the handle of the fixing base; and / or,

[0027] The fixing seat screw plate comprises a clamping seat body, the clamping seat body has a clamping seat threaded hole threadedly matched with the fixing seat threaded fastening portion, and a plurality of rotating operation plates are arranged on the end surface of the clamping seat body facing the fixing seat handle; and / or,

[0028] The fixing seat handle has a plurality of rotation operation protrusions; and / or,

[0029] It also includes an extension seat which is sleeved on the fixing seat body and has one end abutting against the fixing seat bottom plate. The extension seat has an extension seat clamping portion. A first plate clamping space is formed between the fixing seat screw disk and the fixing seat bottom plate to clamp the first plate and the extension seat clamping portion.

[0030] The plate fixing device provided by the utility model can realize fixing the second plate on the first plate, and maintain a preset gap between the second plate and the first plate. In order to realize the fixing of the plate fixing device and the first plate, it is necessary to open a first plate mounting hole on the first plate, and open a second plate mounting hole on the second plate. When installing the second plate, first insert the second end of the fixing seat body into the first plate mounting hole from the back of the first plate until the fixing seat bottom plate abuts against the back of the first plate, and then tighten the fixing seat screw disk on the fixing seat threaded fastening portion, so that the first plate is clamped in the first plate clamping space between the fixing seat screw disk and the fixing seat bottom plate. Then, the second plate mounting hole on the second plate is used to hang on the fixing seat body, and the side surface of the second plate close to the first plate abuts against the fixing seat clamping shaft shoulder, and finally the fixing seat handle is tightened on the fixing seat handle threaded fastening portion, so that the second plate is clamped in the second plate clamping space between the fixing seat handle and the fixing seat clamping shaft shoulder. The distance between the first plate clamping space and the second plate clamping space is the distance between the first plate and the second plate. The utility model adopts the method of clamping the plate to realize the fixing of the plate fixing device to the first plate and the second plate respectively. Compared with the method of fixing with multiple fastening screws in the prior art, one person can complete the installation, and the installation efficiency is higher.

[0031] An exhaust cabinet, comprising:

[0032] The exhaust cabinet body has a back plate and a guide plate;

[0033] A plate fixing device is used to fix the guide plate to the back plate. The plate fixing device is a plate fixing device as described in any of the above items. The first plate is the back plate, and the second plate is the guide plate.

[0034] The exhaust cabinet provided by the utility model has all the technical effects of the above-mentioned plate fixing device, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the structure of the fume hood provided by an embodiment of the utility model;

[0037] Figure 2 A cross-sectional view of a fume hood provided in an embodiment of the utility model;

[0038] Figure 3 A schematic diagram of the structure of a plate fixing device provided in an embodiment of the utility model;

[0039] Figure 4 A cross-sectional view of a plate fixing device provided in an embodiment of the utility model;

[0040] Figure 5 A front view of a plate fixing device provided by an embodiment of the utility model;

[0041] Figure 6 A cross-sectional view of a fixing seat body and an extension tube provided in an embodiment of the utility model;

[0042] Figure 7 A cross-sectional view of a fixing seat screw disk provided in an embodiment of the utility model;

[0043] Figure 8 A schematic diagram of the structure of a fixed seat handle provided in an embodiment of the utility model;

[0044] Fig. 9 A schematic structural diagram of an extension seat provided in an embodiment of the utility model.

[0045] The meanings of the reference numerals in the figures are as follows:

[0046] 100-exhaust cabinet body; 200-board fixing device;

[0047] 101-side plate; 102-guide plate; 103-back plate;

[0048] 210-fixed seat body; 211-fixed seat bottom plate; 212-fixed seat body; 213-fixed seat threaded fastening portion; 214-fixed seat handle threaded fastening portion; 215-positioning protrusion; 216-fixed seat elastic clamp; 217-slot;

[0049] 220-fixing seat screw disk; 221-clamping seat body; 222-rotation operation plate; 223-clamping seat threaded hole;

[0050] 230-fixed seat handle; 231-rotation operation protrusion;

[0051] 240-extension tube; 241-positioning groove; 242-elastic buckle; 243-avoidance groove; 244-extension tube thread fastening part; 245-extension tube elastic clamp;

[0052] 250-Decorative cover;

[0053] 260- second plate clamping space;

[0054] 270-first plate clamping space;

[0055] 280 - long seat; 281 - extended seat body; 282 - extended seat clamping portion; 283 - extended seat hole. DETAILED DESCRIPTION

[0056] The core of the utility model is to provide a plate fixing device to improve installation efficiency;

[0057] Another core of the utility model is to provide a fume hood with the above-mentioned plate fixing device.

[0058] 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 in 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.

[0059] like Figure 3-Figure 5 As shown, the embodiment of the utility model discloses a plate fixing device, which includes a fixing seat body 210, a fixing seat screw disc 220 and a fixing seat handle 230. Among them, the first end of the fixing seat body 210 has a fixing seat threaded fastening portion 213, the second end has a fixing seat handle threaded fastening portion 214, and the end of the first end of the fixing seat body 210 has a fixing seat bottom plate 211. It should be noted that the fixing seat threaded fastening portion 213 should have a certain length, specifically, it can extend to the fixing seat bottom plate 211, so that the fixing seat screw disc 220 has a larger adjustment range to adapt to first plates of various thicknesses.

[0060] The fixed seat bottom plate 211 at the first end of the fixed seat body 212 of the fixed seat body 210 is used to form a limit with the first plate body and clamp on one side of the first plate body. A first plate body mounting hole needs to be opened on the first plate body so that the second end of the fixed seat body 212 passes through the first plate body mounting hole according to the installation direction, and the fixed seat bottom plate 211 is limited on one side of the first plate body. Through the size design, the fixed seat bottom plate 211 cannot pass through the first plate body mounting hole with the fixed seat body 212. It should be noted that in order to prevent the fixed seat body 210 from rotating along the first plate body mounting hole, the first plate body mounting hole can be designed as a polygonal hole, for example, a rectangular hole. A structure with a corresponding cross-sectional shape that matches the first plate body mounting hole can be set on the fixed seat body 212, so that the fixed seat body 210 cannot rotate along the first plate body mounting hole, thereby improving the stability after installation.

[0061] The fixing seat screw disc 220 is threadedly matched with the fixing seat threaded fastening portion 213, and forms a first plate clamping space 270 for clamping the first plate body between the fixing seat screw disc 220 and the fixing seat threaded fastening portion 213, and as the matching depth of the fixing seat screw disc 220 and the fixing seat threaded fastening portion 213 gradually increases, the fixing seat screw disc 220 and the fixing seat base plate 211 are respectively clamped on both sides of the first plate body, that is, the first plate body is limited in the first plate clamping space 270, thereby achieving the purpose of fixing the plate fixing device on the first plate body.

[0062] The fixed seat body 212 is a stepped shaft structure, so that a fixed seat clamping shoulder is formed at the step position, and the shaft diameter of the fixed seat threaded fastening portion 213 is larger than the shaft diameter of the fixed seat handle threaded fastening portion 214. The fixed seat handle 230 has a screw hole that can be threadedly matched with the fixed seat handle threaded fastening portion 214, and when the fixed seat handle 230 is threadedly matched with the fixed seat handle threaded fastening portion 214, a second plate clamping space 260 for clamping the second plate can be formed between the fixed seat handle 230 and the fixed seat clamping shoulder. As the matching depth of the fixed seat handle 230 and the fixed seat handle threaded fastening portion 214 gradually increases, the fixed seat handle 230 and the fixed seat clamping shoulder are respectively clamped on both sides of the second plate, that is, the second plate is limited in the second plate clamping space 260, and the purpose of fixing the second plate on the plate fixing device is achieved.

[0063] like Figure 1 and Figure 2 As shown, those skilled in the art can understand that when the plate fixing device 200 is applied to a fume hood, the first plate is the back plate 103 of the fume hood, and the second plate is the guide plate 102 of the fume hood.

[0064] The plate fixing device provided by the utility model can fix the second plate on the first plate and maintain a preset gap between the second plate and the first plate. In order to fix the plate fixing device to the first plate, a first plate mounting hole needs to be opened on the first plate and a second plate mounting hole needs to be opened on the second plate.

[0065] When installing the second plate, first insert the second end of the fixing seat body 210 from the back of the first plate into the first plate mounting hole until the fixing seat bottom plate 211 abuts against the back of the first plate, and then tighten the fixing seat screw disc 220 on the fixing seat threaded fastening portion 213, so that the first plate is clamped in the first plate clamping space 270 between the fixing seat screw disc 220 and the fixing seat bottom plate 211. Then, the second plate is hung on the fixing seat body 210 using the second plate mounting hole on the second plate, and the side surface of the second plate close to the first plate abuts against the fixing seat clamping shoulder, and finally, tighten the fixing seat handle 230 on the fixing seat handle threaded fastening portion 214, so that the second plate is clamped in the second plate clamping space 260 between the fixing seat handle 230 and the fixing seat clamping shoulder. The distance between the first plate clamping space 270 and the second plate clamping space 260 is the distance between the first plate and the second plate. The utility model adopts a plate clamping method to realize the fixing of the plate fixing device to the first plate and the second plate respectively. Compared with the fixing method using multiple fastening screws in the prior art, one person can complete the installation and the installation efficiency is higher.

[0066] It is understood by those skilled in the art that, according to experimental requirements, the fume hood is usually provided with a part to be fixed (such as a distillation rack), and the plate fixing device is generally used as a fixing device for the part to be fixed. In order to ensure that the part to be fixed can be fixed, the fixing seat body 210 is usually designed as a hollow structure, so that the fixing portion of the part to be fixed can be inserted into the hollow structure of the fixing seat body 210, thereby fixing the part to be fixed.

[0067] In the prior art, a thread is usually provided at the end of the fixing portion of the fixed part, and a threaded hole is provided on the fixing seat body 210, so that the fixed part is fixed on the fixing seat body 210 by threaded matching. It can be understood by those skilled in the art that in order to ensure smooth matching, there is a certain gap between the threads, so that the fixed part will shake slightly after installation, causing the fixed part to sag under the action of gravity.

[0068] like Figure 6 As shown, based on this, the end of the second end of the fixing seat body 210 is provided with a plurality of fixing seat avoidance notches extending along the axial direction of the fixing seat body 210, so as to form a fixing seat elastic clamping claw 216 between two adjacent fixing seat avoidance notches. It can be understood by those skilled in the art that by providing the fixing seat avoidance notches, the fixing seat elastic clamping claw 216 will have a certain amount of inward deformation, and the fixing seat elastic clamping claw 216 can be pressed in the direction of the axis by means of external force, so that the fixing seat elastic clamping claw 216 tightly embraces the fixing part of the hollow structure to be fixed inserted into the fixing seat body 210, and the fixing part of the to-be-fixed part is locked on the fixing seat body 210 by means of friction.

[0069] The fixing seat handle 230 has a tapered hole, which is coaxially spaced with the threaded hole of the fixing seat handle 230. When the fixing seat handle 230 is threadedly matched with the fixing seat handle threaded fastening portion 214, the tapered hole drives the fixing seat elastic clamp 216 to hold the fixing portion of the part to be fixed. It should be noted that the diameter of the large diameter end of the tapered hole can be larger than the outer diameter surrounded by each fixing seat elastic clamp 216, and the diameter of the small diameter end of the tapered hole can be smaller than the outer diameter surrounded by each fixing seat elastic clamp 216. In this embodiment, the method of using the fixing seat elastic clamp 216 to hold the fixing portion of the part to be fixed is more stable and reliable than the method of threaded matching in the prior art, and will not sag due to gravity.

[0070] like Figure 6 As shown, in the direction from the end of the second end of the fixing seat body 210 to the first end of the fixing seat body 210, the fixing seat elastic clamping claw 216, the fixing seat handle threaded fastening portion 214 and the fixing seat clamping shoulder are arranged in sequence.

[0071] Different styles of fume hoods have different air volume requirements, and the air volume is mainly adjusted by the shape of the guide plate and the interlayer space between the guide plate and the back plate (i.e., the air duct). Therefore, in order to be able to adjust the width of the air duct, in this embodiment, an extension tube 240 is added, and the first end of the extension tube 240 is used to be fixedly mounted on the second end of the fixed seat body 210.

[0072] like Figure 6 As shown, the second end of the extension tube 240 has a structure similar to the second end of the fixed seat body 210, that is, the second end of the extension tube 240 has an extension tube threaded fastening portion 244, and the screw hole of the fixed seat handle 230 can also be threadedly matched with the extension tube threaded fastening portion 244, that is, the extension tube threaded fastening portion 244 and the fixed seat handle threaded fastening portion 214 have a thread structure with equal diameter, so that the fixed seat handle threaded fastening portion 214 and the extension tube threaded fastening portion 244 can both be threadedly matched with the screw hole of the fixed seat handle 230.

[0073] Those skilled in the art can determine whether to use the extension tube 240 according to the air duct width requirement. When the extension tube 240 is not required, a relatively narrow air duct can be obtained; when the extension tube 240 is used, a wider air duct can be obtained. It should be noted that the extension tube 240 can be equipped with a variety of sizes to adjust the air duct with more widths.

[0074] When the fixing seat handle 230 is threadedly matched with the extension tube thread fastening portion 244, a second plate clamping space 260 for clamping the second plate can be formed between the fixing seat handle 230 and the extension tube clamping shoulder of the extension tube 240. As the matching depth between the fixing seat handle 230 and the extension tube thread fastening portion 244 gradually increases, the fixing seat handle 230 and the extension tube clamping shoulder are respectively clamped on both sides of the second plate, that is, the second plate is limited in the second plate clamping space 260, thereby achieving the purpose of fixing the second plate on the plate fixing device.

[0075] After the extension tube 240 is installed, in order to achieve the fixation of the to-be-fixed component, the fixing seat body 210 and the extension tube 240 are both hollow structures.

[0076] The end of the second end of the extension tube 240 is provided with a plurality of extension tube avoidance notches extending along the axial direction of the extension tube 240, so as to form an extension tube elastic clamp 245 between two adjacent extension tube avoidance notches. It can be understood by those skilled in the art that by providing the extension tube avoidance notches, the extension tube elastic clamp 245 will have a certain amount of inward deformation, and the extension tube elastic clamp 245 can be pressed in the direction of the axis by means of external force, so that the extension tube elastic clamp 245 tightly embraces the fixing part of the hollow structure to be fixed inserted into the extension tube 240 and the fixing seat body 210, and the fixing part of the fixing part to be fixed is locked on the extension tube 240 and the fixing seat body 210 by means of friction.

[0077] The fixing seat handle 230 has a tapered hole, which is coaxially spaced with the threaded hole of the fixing seat handle 230. When the fixing seat handle 230 is threadedly matched with the extension tube threaded fastening portion 244, the tapered hole drives the extension tube elastic clamp 245 to hold the fixing portion of the part to be fixed. It should be noted that the diameter of the large diameter end of the tapered hole can be larger than the outer diameter surrounded by each extension tube elastic clamp 245, and the diameter of the small diameter end of the tapered hole can be smaller than the outer diameter surrounded by each extension tube elastic clamp 245. In this embodiment, the method of using the extension tube elastic clamp 245 to hold the fixing portion of the part to be fixed is more stable and reliable than the method of threaded matching in the prior art, and will not sag due to gravity.

[0078] like Figure 6 As shown, in the direction from the end of the second end of the extension tube 240 to the first end of the extension tube 240, the extension tube elastic clamping claw 245, the extension tube threaded fastening portion 244 and the extension tube clamping shoulder are arranged in sequence.

[0079] like Figure 5As shown, in order to achieve the fixation of the relative position of the extension tube 240 and the fixing seat body 210, in this embodiment, a positioning groove 241 that penetrates the wall thickness is opened on the extension tube 240, and a positioning protrusion 215 that cooperates with the positioning groove 241 is provided on the fixing seat body 210, and the positioning groove 241 is a groove body with a gradually changing width. When installing the extension tube 240, the second end of the fixing seat body 210 can be inserted into the extension tube 240 until the positioning protrusion 215 is inserted into the wider end of the positioning groove 241, and then the extension tube 240 is rotated so that the positioning protrusion 215 slides along the positioning groove 241, sliding from the wider end to the narrower end. When sliding to the end of the narrower end, the positioning protrusion 215 is clamped by the two side walls of the positioning groove 241 to limit the extension tube 240 from sliding along the axial direction.

[0080] Furthermore, in order to facilitate the positioning protrusion 215 to slide into the positioning groove 241, in this embodiment, a slide groove for the positioning protrusion 215 to slide into the positioning groove 241 is provided on the inner wall of the extension tube 240. When installing the extension tube 240, it is necessary to align the positioning protrusion 215 with the slide groove, and then move the extension tube 240 axially so that the positioning protrusion 215 gradually slides along the slide groove toward the direction of the positioning groove 241 until it slides into the positioning groove 241. It should be noted that the slide groove can be provided at a position corresponding to the wider end of the positioning groove 241.

[0081] Furthermore, an elastic buckle 242 is disposed at the end of the first end of the extension tube 240. In order to ensure that the elastic buckle 242 has a certain amount of deformation, an avoidance groove 243 needs to be provided around the elastic buckle 242 to prevent other parts of the extension tube 240 from interfering with the deformation of the elastic buckle 242. A clamping groove 217 for clamping with the elastic buckle 242 is disposed on the fixing seat body 210.

[0082] When installing the extension tube 240, the second end of the fixing seat body 210 can be inserted into the extension tube 240 until the positioning protrusion 215 is inserted into the wider end of the positioning groove 241, and then the extension tube 240 is rotated so that the positioning protrusion 215 slides along the positioning groove 241 from the wider end to the narrower end. At the same time, as the extension tube 240 rotates, the elastic buckle 242 gradually approaches the clamping groove 217. When sliding to the end of the narrower end, the positioning protrusion 215 is clamped by the two side walls of the positioning groove 241 to limit the extension tube 240 from sliding along the axial direction. At the same time, the elastic buckle 242 is clamped into the clamping groove 217 to limit the rotation of the extension tube 240.

[0083] When the plate fixing device does not need to fix the part to be fixed, a decorative cover 250 can be added and snapped onto the end hole of the fixing seat handle 230 to block the end hole and improve the aesthetics.

[0084] like Figure 7As shown, the fixed seat screw plate 220 includes a clamping seat body 221, the clamping seat body 221 has a clamping seat threaded hole 223 threadedly matched with the fixed seat threaded fastening portion 213, and a plurality of rotating operation plates 222 are arranged on the end surface of the clamping seat body 221 facing the fixed seat handle 230. The rotating operation plates 222 can be arranged to facilitate the installer to rotate the fixed seat screw plate 220, and the rotating operation plates 222 are arranged on the end surface facing the fixed seat handle 230, which can facilitate the installer to install on the front of the back plate of the exhaust cabinet. Figure 8 As shown, the fixing seat handle 230 has a plurality of rotation operation protrusions 231 to facilitate the installer to rotate the fixing seat handle 230 .

[0085] It is understood by those skilled in the art that the thickness of the first plate may be different, that is, different exhaust cabinets may have different thicknesses of back plates. In order to adapt to back plates of various thicknesses. The plate fixing device disclosed in this embodiment may also include an extension seat 280 (such as an extension seat 280) which is sleeved on the fixing seat body 210 and has one end abutting against the fixing seat bottom plate 211. Fig. 9 As shown), the extension seat 280 has an extension seat body 281, an extension seat clamping portion 282 located at one end of the extension seat body 281, and an extension seat hole 283 for being sleeved on the fixed seat body 210.

[0086] It should be noted that, in order to prevent the extension seat 280 from rotating along the first plate body mounting hole, the first plate body mounting hole can be designed as a polygonal hole, for example, a rectangular hole. The extension seat body 281 can be set to a structure with a corresponding cross-sectional shape that matches the first plate body mounting hole, so that the extension seat 280 cannot rotate along the first plate body mounting hole, thereby improving the stability after installation.

[0087] A first plate clamping space 270 for clamping the first plate and the extension seat clamping portion 282 is formed between the fixed seat screw disc 220 and the fixed seat bottom plate 211. The first plate is clamped between the extension seat clamping portion 282 and the fixed seat screw disc 220. In this embodiment, by using the extension seat 280, a longer extension seat body 281 can be obtained to adapt to the first plate of corresponding thickness. If the portion on the fixed seat body 212 that matches the first plate mounting hole and has the same shape is insufficient in length, the extension seat 280 can be installed to increase the length of the portion (i.e., the extension seat body 281) that matches the first plate mounting hole and has the same shape.

[0088] like Figure 1 and Figure 2As shown, the embodiment of the utility model further discloses a fume hood, including a fume hood cabinet body 100 and a plate fixing device 200. The fume hood cabinet body 100 has a back plate 103, a side plate 101 and a guide plate 102. The plate fixing device 200 is used to fix the guide plate 102 to the back plate 103. The plate fixing device 200 is the plate fixing device 200 disclosed in the above embodiment, the first plate is the back plate 103, and the second plate is the guide plate 102. The fume hood disclosed in the embodiment of the utility model has all the technical effects of the above plate fixing device 200, which will not be repeated herein.

[0089] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0090] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0091] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0092] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A plate fixing device, characterized in that: include: A fixing seat body (210), wherein the first end of the fixing seat body (210) has a fixing seat threaded fastening portion (213), the second end has a fixing seat handle threaded fastening portion (214), and the end of the first end of the fixing seat body (210) has a fixing seat bottom plate (211); A fixing seat screw disk (220) is threadably matched with the fixing seat threaded fastening portion (213) and forms a first plate clamping space (270) for clamping the first plate with the fixing seat bottom plate (211); A fixed seat handle (230), when the fixed seat handle (230) is threadedly matched with the fixed seat handle threaded fastening portion (214), a second plate clamping space (260) for clamping a second plate can be formed between the fixed seat handle (230) and the fixed seat clamping shoulder of the fixed seat body (210).

2. The plate fixing device according to claim 1, characterized in that: The fixing seat body (210) is a hollow structure for fixing the part to be fixed; The end portion of the second end of the fixing seat body (210) is provided with a plurality of fixing seat avoidance notches extending along the axial direction of the fixing seat body (210), so as to form a fixing seat elastic clamping claw (216) between two adjacent fixing seat avoidance notches, and the fixing portion of the to-be-fixed component is inserted into the fixing seat body (210) from the second end of the fixing seat body (210); The fixing seat handle (230) has a tapered hole, and when the fixing seat handle (230) is threadedly matched with the fixing seat handle threaded fastening portion (214), the tapered hole drives the fixing seat elastic clamp (216) to tightly hold the fixing portion of the part to be fixed.

3. The plate fixing device according to claim 2, characterized in that: In the direction from the end of the second end of the fixing seat body (210) to the first end of the fixing seat body (210), the fixing seat elastic clamping claw (216), the fixing seat handle threaded fastening portion (214) and the fixing seat clamping shoulder are arranged in sequence.

4. The plate fixing device according to claim 1, characterized in that: It also includes an extension tube (240), wherein the first end of the extension tube (240) is used to be fixedly sleeved on the second end of the fixing seat body (210); The second end of the extension tube (240) has an extension tube threaded fastening portion (244), and when the fixed seat handle (230) and the extension tube threaded fastening portion (244) are threadedly matched, a second plate clamping space (260) for clamping the second plate can be formed between the fixed seat handle (230) and the extension tube clamping shoulder of the extension tube (240).

5. The plate fixing device according to claim 4, characterized in that: The fixing seat body (210) and the extension tube (240) are hollow structures for fixing the part to be fixed; The end of the second end of the extension tube (240) is provided with a plurality of extension tube avoidance notches extending along the axial direction of the extension tube (240), so as to form an extension tube elastic clamp (245) between two adjacent extension tube avoidance notches, and the fixing portion of the part to be fixed is inserted into the extension tube (240) from the second end of the extension tube (240); The fixing seat handle (230) has a tapered hole, and when the fixing seat handle (230) is threadedly matched with the extension tube threaded fastening portion (244), the tapered hole drives the extension tube elastic clamp (245) to tightly hold the fixing portion of the part to be fixed.

6. The plate fixing device according to claim 5, characterized in that: In the direction from the end of the second end of the extension tube (240) to the first end of the extension tube (240), the extension tube elastic clamp (245), the extension tube threaded fastening portion (244) and the extension tube clamping shoulder are arranged in sequence.

7. The plate fixing device according to claim 4, characterized in that: The extension tube (240) is provided with a positioning groove (241) penetrating the wall thickness, and the fixing seat body (210) is provided with a positioning protrusion (215) cooperating with the positioning groove (241). The positioning groove (241) is a groove body with a gradually changing width.

8. The plate fixing device according to claim 7, characterized in that: The inner wall of the extension tube (240) is provided with a sliding groove for the positioning protrusion (215) to slide into the positioning groove (241); and / or, An elastic buckle (242) is provided at the end of the first end of the extension tube (240), and a clamping groove (217) clamped with the elastic buckle (242) is provided on the fixing seat body (210).

9. The plate fixing device according to any one of claims 1 to 8, characterized in that: It also includes a decorative cover (250) that is snapped onto the end hole of the fixing seat handle (230); and / or, The fixing seat screw disk (220) comprises a clamping seat body (221), the clamping seat body (221) has a clamping seat threaded hole (223) threadedly matched with the fixing seat threaded fastening portion (213), and a plurality of rotating operation plates (222) are arranged on the end surface of the clamping seat body (221) facing the fixing seat handle (230); and / or, The fixing seat handle (230) has a plurality of rotation operation protrusions (231); and / or, It also includes an extension seat (280) which is sleeved on the fixing seat body (210) and has one end abutting against the fixing seat bottom plate (211); the extension seat (280) has an extension seat clamping portion (282); and a first plate body clamping space (270) is formed between the fixing seat screw disk (220) and the fixing seat bottom plate (211) for clamping the first plate body and the extension seat clamping portion (282).

10. A fume hood, characterized in that: include: An exhaust cabinet body (100) has a back plate (103) and a guide plate (102); A plate fixing device (200) is used to fix the guide plate (102) to the back plate (103), the plate fixing device (200) is the plate fixing device (200) according to any one of claims 1 to 9, the first plate is the back plate (103), and the second plate is the guide plate (102).

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