CN112482912A - Mechanical limiting device for ventilation cabinet door - Google Patents

Abstract

The application relates to a mechanical stop device of fume chamber cabinet door relates to the field of fume chamber, and it marks the stopper of position department including being used for fixed connection at the stand to and just be used for installing the spacing post in fume chamber arbitrary one side with stopper cooperation joint. This application can let the cabinet door of fume chamber open the back, receives experimenter's mistake and bumps and can not take place to rise to guarantee experimenter's operating space safety.

Description

Mechanical limiting device for ventilation cabinet door

Technical Field

The application relates to the field of fume hoods, in particular to a mechanical limiting device for a fume hood door.

Background

Fume hoods are mainly used for experimental operations, and when experiments which may generate harmful gases are required in a laboratory, the operations are required in the fume hoods.

The existing fume hood comprises a workbench, side plates, a top plate, a back plate and upright posts. Two side plates are arranged on two sides of the workbench, the top plate is installed between the two side plates, and the top plate is arranged on the upper sides of the side plates and fixedly connected with the side plates. The cabinet door is installed at the front side of the top plate, the back plate is arranged at the rear side of the top plate, and the side plate, the top plate, the back plate, the workbench and the cabinet door enclose a cavity.

The top plate is provided with an exhaust outlet for exhausting gas generated in the cavity in a penetrating manner, the exhaust outlet is connected with the exhaust fan, and the exhaust fan extracts gas from the inside of the cavity through the exhaust outlet during operation. When the exhaust fan operates, air outside the cavity is supplemented to the inside of the cavity from the cabinet door, and the stability of air pressure inside the cavity is guaranteed.

When the staff used the fume chamber to carry out the experiment, the staff lifted the cabinet door of fume chamber to the take the altitude after, then stretched into the cavity with the hand from the downside of cabinet door, carried out the experiment operation in the cavity.

In the actual experimentation, because the height of opening of cabinet door has certain influence to the inside intake of fume chamber, so the experimenter is when doing the experiment, generally can lift the cabinet door to the position department of mark, guarantees that the fume chamber cavity is inside to have good air inlet effect, and inside harmful gas is difficult for leaking from the cabinet door. After the cabinet door is opened, the staff bends over and stretches into the inside experiment that carries out of cavity with the hand, but at the in-process of experiment, the lower limb of cabinet door can be touched in experimenter's shoulder position, plays certain promotion effect to the cabinet door, leads to the cabinet door to take place to rise, and then causes the influence to the discharge of the inside harmful gas of fume chamber cavity.

Disclosure of Invention

In order to let the cabinet door of fume chamber open the back, be convenient for stop marking position department and can receive the restriction, this application provides a mechanical stop device of fume chamber cabinet door.

The application provides a mechanical stop device of fume chamber cabinet door adopts following technical scheme:

a mechanical limiting device for a fume hood door comprises a limiting block and limiting columns, wherein the limiting block is fixedly connected to a mark position of an upright post, and the limiting columns are matched and clamped with the limiting block and are used for being installed at two ends of a handle of the fume hood door;

the mechanical limiting device further comprises a control component for pulling the limiting column to be retracted and popped up at the two ends of the handle.

Through adopting above-mentioned technical scheme, when the staff lifted the cabinet door, the downside of convex spacing post and stopper took place to contact on the connection plug for the stopper stops to the rising of cabinet door, thereby can not appear touching the cabinet door because of the experimenter and lead to the condition that the cabinet door rises.

The control assembly controls the limiting columns to stretch out and draw back at the two ends of the handle, the limiting columns can be retracted into the handle, and then when the cabinet door is lifted up, the limiting columns cannot be in contact with limiting blocks, the cabinet door can be opened to the maximum degree, and experimental equipment is conveniently arranged inside the ventilation cabinet.

Optionally, the limiting column is sleeved with a mounting sleeve used for mounting the limiting column and having two closed ends, the mounting sleeve is fixed at two ends of the handle, one end of the limiting column penetrates out of the mounting sleeve, the other end of the limiting column is fixedly connected with a pull rod arranged along the length direction of the limiting column, and the pull rod penetrates out of the mounting sleeve;

and the mounting sleeve is also internally provided with an expansion spring, one end of the expansion spring is fixed with the end part of the limiting column, the other end of the expansion spring is fixed with the mounting sleeve, and the expansion spring is integrally sleeved on the pull rod.

Through adopting above-mentioned technical scheme, stimulate the pull rod, can let spacing post withdraw the installation sleeve to install the installation sleeve at the both ends of handle, conveniently install spacing post on the handle, set up expanding spring in the installation sleeve moreover, when loosening the pulling to the pull rod, can let the automatic installation sleeve of following of one end of spacing post pop out under expanding spring's effect.

Optionally, the control assembly is used for being installed in an accommodating groove formed in the handle; the limiting column is used for being connected with the control assembly in the handle.

Through adopting above-mentioned technical scheme, the handle of installation control assembly and spacing post is the cast, and control assembly and spacing post are arranged in the handle, let control assembly and handle have better disguise and can install more firm to still can not lead to the fact the interference to lifting up the cabinet door.

Optionally, the control assembly includes a substrate for being installed in the accommodating groove, a slider slidably connected to the substrate, a pull rope with one end fixed to the slider and the other end fixed to the pull rod, an installation cover with two open ends and disposed on the substrate, a strip-shaped hole disposed on the installation cover, and a key disposed in the strip-shaped hole and used for pushing the slider.

Through adopting above-mentioned technical scheme, press the button, the button promotes the slider, and the slider slides on the base plate, and the slider stimulates the pull rod through the stay cord, and then stimulates spacing post, stimulates spacing post through using the gliding mode of button promotion slider, and the convenience is stimulateed spacing post of arranging in the handle.

Optionally, a push block is fixedly connected to the lower side of the key, and a push groove is formed in the slide block;

the groove wall of the push groove, which is far away from one side of the pull rope, is an inclined plane inclined towards one side far away from the pull rope, and the lower edge of the push block is in contact with the upper edge of the inclined plane of the push groove.

By adopting the technical scheme, when the key is pressed, the push block on the lower side of the key slides in the push groove, the key moves in the vertical direction, and the slide block is pushed to slide on the base plate in the horizontal direction, so that the pull rod is pulled.

Optionally, the lower side edge fixedly connected with of button is a plurality of along the restriction board that button circumference encircleed, fixedly connected with is used for the fixture block with the bar hole joint on the restriction board.

Through adopting above-mentioned technical scheme, when the button was installed in the bar hole, the limiting plate inserted in the bar hole, and the last surface of fixture block and the intrados contact of installation cover can restrict the button and deviate from in the bar hole. In-process in installing the button in the bar hole only needs to press the limiting plate, just can let the limiting plate temporarily take place to warp, makes things convenient for the staff to install the button to and prevent that the button from deviating from in the bar hole.

Optionally, the base plate is fixedly connected with an insertion rod, and the key is fixedly connected with an insertion tube sleeved on the insertion rod;

the inserted bar is sleeved with a return spring, and the return spring is positioned in the inserted tube.

Through adopting above-mentioned technical scheme, when the button was installed in the bar hole, the intubate cover was established on the inserted bar, and the answer spring is arranged in the intubate for inserted bar and intubate are maintained the balance of button through the grafting complex mode, and under the effect of answer spring, can let the button get back to the normal position more easily.

Optionally, the substrate is fixedly connected with two supporting blocks, the supporting blocks are provided with through holes, connecting rods penetrate through the through holes of the two supporting blocks, two ends of each connecting rod are located at the outer sides of the two supporting blocks, two ends of each connecting rod are vertically and fixedly connected with arrangement rods, and one end of each arrangement rod is fixedly connected with the corresponding connecting rod;

a supporting hole is arranged on the push block in a penetrating way, and the other end of the arranging rod is inserted into the supporting hole.

Through adopting above-mentioned technical scheme, when pressing the button, the connecting rod takes place to rotate with arranging the pole, and supporting shoe, connecting rod and arrange the pole and carry out further support to the button, improve the equilibrium degree when button installation.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the mechanical limiting device is arranged on the ventilation cabinet, so that the limiting block blocks the cabinet door from rising, and the situation that the cabinet door rises due to the fact that an experimenter touches the cabinet door cannot occur;

2. the limiting column is retractable, so that a worker can open the cabinet door to the maximum degree;

3. through setting up control assembly, can let the shrink of spacing post go on more easily.

Drawings

FIG. 1 is a schematic view of a mechanical stop device disposed on a column and a handle of a fume hood in this embodiment;

FIG. 2 is a schematic view of the handle of the present embodiment with a position-limiting post and a control assembly;

FIG. 3 is a schematic structural view of the limiting post sleeved with the mounting sleeve in this embodiment;

FIG. 4 is a schematic view of the control assembly, the pull rope and the position-limiting post of the present embodiment;

FIG. 5 is a schematic diagram of a control assembly according to the present embodiment;

FIG. 6 is a schematic diagram of the control assembly of the present embodiment in which the key is engaged with the slider and the substrate is slidably connected to the slider;

fig. 7 is a schematic view illustrating the insertion tube disposed under the key of the present embodiment and the insertion rod on the substrate.

Description of reference numerals: 1. a column; 2. a cabinet door; 3. a handle; 31. connecting a plug; 32. the receiving groove is labeled 4313 in FIG. 2; 4. a mechanical limiting device; 41. a limiting block; 42. a limiting column; 421. a limiting step; 43. a control component; 431. a substrate; 4311. a guide groove; 4312. inserting a block; 4313. a yielding groove; 4314. inserting a rod; 4315. a support block; 432. a slider; 4221. a chute; 4322. pushing the groove; 433. pulling a rope; 434. mounting a cover; 4341. wrapping the edges; 4342. a strip-shaped hole; 435. pressing a key; 4351. a push block; 4352. a limiting plate; 4353. a clamping block; 4354. inserting a tube; 4355. a support hole; 436. a return spring; 437. a connecting rod; 438. arranging a rod; 44. installing a sleeve; 441. a closing plate; 442. installing a plug; 45. a pull rod; 46. a telescoping spring.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses mechanical stop device of fume chamber cabinet door. Referring to fig. 1, the fume hood includes two upright posts 1 vertically arranged and a door 2 arranged between the two upright posts 1 to be lifted. The cabinet door 2 is also provided with a handle 3 for lifting the cabinet door 2, and the handle 3 is tubular.

Referring to fig. 1 and 2, two ends of the handle 3 are fixedly connected with connecting plugs 31, the connecting plugs 31 are fixedly connected with the frame of the cabinet door 2, and the handle 3 is horizontally and fixedly connected to the frame of the cabinet door 2 through the connecting plugs 31 fixedly connected with the two ends.

The fume hood also comprises a mechanical limiting device 4 for limiting the lifting of the cabinet door 2. Referring to fig. 1 and 2, the mechanical limiting device 4 includes a limiting block 41 fixedly connected to the column 1 and indicating the position, a limiting column 42 slidably mounted at both ends of the handle 3 and used for cooperating with the limiting block 41 to clamp and limit the lifting of the cabinet door 2, and a control assembly 43 mounted on the handle 3 and used for controlling the limiting column 42 to withdraw and pop up from both ends of the handle 3 in the handle 3, wherein the limiting column 42 is clamped with the limiting block 41 through expansion and contraction.

The limiting block 41 is provided with a screw which is in threaded connection with the upright post 1. The side of the limiting block 41 facing the ground is a plane, and the side facing away from the ground is an arc surface.

Referring to fig. 2 and 3, the limiting column 42 is sleeved with a mounting sleeve 44, one end of the mounting sleeve 44 is fixedly connected with a sealing plate 441, the other end of the mounting sleeve 44 is provided with an internal thread, and a mounting plug 442 in threaded connection with the mounting sleeve 44 is mounted on the mounting sleeve. One end of the limiting column 42 penetrates through the mounting plug 442 and is connected with the mounting plug 442 in a sliding manner, the other end of the limiting column 42 is fixedly connected with a pull rod 45 arranged along the length direction of the limiting column 42, the other end of the pull rod 45 penetrates through the closing plate 441, and the diameter of the pull rod 45 is smaller than that of the limiting column 42. An extension spring 46 is further installed in the mounting sleeve 44 and positioned between the closing plate 441 and the limiting column 42, and a limiting step 421 for limiting the penetration length of the limiting column 42 on the mounting plug 442 is convexly arranged on the outer peripheral surface of the limiting column 42.

The mounting sleeve 44 is mounted in the handle 3, in this embodiment, the connecting plug 31 is provided with a groove with an internal thread, and the outer wall of the mounting sleeve 44 is provided with an external thread to be in threaded connection with the connecting plug 31.

Referring to fig. 2 and 4, a receiving groove 32 is opened on the handle 3, and a control assembly 43 is disposed in the receiving groove 32. The control assembly 43 comprises a base plate 431 which is arranged in the accommodating groove 32 and is in a long strip shape, two sliding blocks 432 which are arranged along the length direction of the base plate 431 are connected on the base plate 431 in a sliding mode, a pulling rope 433 is installed on the sliding block 432, one end of the pulling rope 433 is fixedly connected to the sliding block 432, the other end of the pulling rope is fixedly connected to the pull rod 45, and the control assembly 43 can be pulled to the limiting rod through the sliding connection of the sliding block 432 on the base plate 431.

Referring to fig. 5, a guide groove 4311 is penetratingly formed in the base 431 and arranged along a length direction of the base 431, and the slider 432 is installed in the guide groove 4311. Sliding grooves 4221 matched with the guide grooves 4311 are formed in two sides of the sliding block 432, and groove walls of the guide grooves 4311 are embedded into the sliding grooves 4221.

An inserting block 4312 which is inserted into the handle 3 and is fixedly connected with the handle 3 through screw threads is fixedly connected to the base plate 431, a yielding groove 4313 is formed in the inserting block 4312, and the sliding block 432 is arranged in the yielding groove 4313.

Referring to fig. 4 and 5, an installation cover 434 with an inverted U-shaped cross section is covered on the substrate 431, the installation cover 434 is arranged in the accommodating groove 32, openings for the pull rope 433 to penetrate out are provided at two ends of the installation cover 434, an outer wrapping edge 4341 is arranged around the edge of the installation cover 434, the outer wrapping edge 4341 covers the gap between the arc-shaped plate and the installation groove, and the outer wrapping edge 4341 is attached to the surface of the handle 3.

A strip-shaped hole 4342 is formed in the mounting cover 434, and a key 435 for pushing the slider 432 is installed in the strip-shaped hole 4342. When the mounting cover 434 is mounted on the handle 3, the opening direction of the bar-shaped hole 4342 is the same as the opening direction of the housing groove 32 in the handle 3.

Referring to fig. 6 and 7, a push block 4351 is fixedly connected to a lower side of the key 435, a push groove 4322 is formed in the slider 432, the push groove 4322 is a through groove in a length direction of the slider 432 perpendicular to the handle 3, and the push block 4351 is located above the push groove 4322 when the key 435 is mounted on the slider 432. The wall of the push slot 4322 on the side away from the pull rope 433 is an inclined surface inclined to the side away from the pull rope 433, and the lower edge of the push block 4351 contacts with the upper edge of the push slot 4322.

The edge of the lower side of the key 435 is fixedly connected with a plurality of limiting plates 4352, the limiting plates 4352 are circumferentially arranged on the key 435 at equal intervals along the circumference of the key 435, each limiting plate 4352 is fixedly connected with a fixture block 4353, and the arrangement direction of the fixture blocks 4353 faces the outer side of the key 435. The section of the fixture block 4353 is a right triangle, the upper surface of the fixture block 4353 is a plane, and the surface of the fixture block 4353 contacting the limiting plate 4352 is also a plane. Corners of the fixture block 4353 are chamfered. When the key 435 is installed in the bar-shaped hole 4342, the limiting plate 4352 is inserted into the bar-shaped hole 4342, and the upper surface of the clamping block 4353 contacts with the inner arc surface of the arc-shaped plate, so that the key 435 can be limited from being removed from the bar-shaped hole 4342.

As the operator presses the button 435, the push block 4351 on the button 435 moves downward, and during movement, the push block 4351 slides along the groove wall of the push groove 4322, and since the movement direction of the push block 4351 is vertical to the length direction of the handle 3, and the slide block 432 moves along the length direction of the handle 3, when the push block 4351 moves downward, the slide block 432 is pushed by the movement of the push block 4351 along the groove wall of the push groove 4322, and the slide block 432 is driven to slide in the guide groove 4311.

A vertically upward-arranged insertion rod 4314 is fixedly connected to the base plate 431, a return spring 436 is sleeved on the insertion rod 4314, a vertically downward-arranged insertion tube 4354 is fixedly connected to the lower side of the key 435, the insertion tube 4354 is sleeved on the insertion rod 4314, the return spring 436 is located in the insertion tube 4354, and when the key 435 is not pressed, the return spring 436 is in a balanced state. When the button 435 is pressed, the insertion tube 4354 is inserted into the insertion tube 4354.

Referring to fig. 6 and 7, two supporting blocks 4315 made of an elastic material, such as rubber or silicone, are fixedly connected to the base plate 431. Two through holes are formed in the supporting block 4315, an open slot communicated with the through holes is formed in the supporting block 4315, a connecting rod 437 penetrates through the through holes of the two supporting blocks 4315, the length of the connecting rod 437 is greater than the distance between the two supporting blocks 4315, and the arrangement direction of the connecting rod 437 is the same as the arrangement direction of the handle 3. Both ends of the connecting rod 437 are located at the outer sides of the two supporting blocks 4315, a disposing rod 438 is vertically and fixedly connected to both ends of the connecting rod 437, and one end of the disposing rod 438 is fixedly connected to the connecting rod 437.

Referring to fig. 6 and 7, a support hole 4355 is formed through the push block 4351, and the other end of the disposing rod 438 is inserted into the support hole 4355. Two push blocks 4351 are arranged on the key 435, so that the two mounting rods are respectively connected with the two push blocks 4351.

When the spacing post 42 needs to be pulled back, the operator presses the key 435, the key 435 is pressed, the slider 432 is pushed, so that the slider 432 slides in the guide groove 4311 to the side away from the stopper 41, the position-limiting post 42 is pulled through the pulling rope 433, so that the position-limiting post 42 is retracted into the handle 3, when the working personnel can open the cabinet door 2 upwards, the interference of the limiting column 42 and the limiting block 41 to the opening of the cabinet door 2 is prevented, when the worker lifts the cabinet door 2 to the position higher than the limiting block 41 on the lower side of the cabinet door 2, the limiting column 42 is not contacted with the limiting block 41 any more, then the worker releases the press of the key 435, under the effect of answer spring 436 and expanding spring 46, let button 435 kick-back to the normal position, spacing post 42 can pop out again, and the staff can open cabinet door 2 to the biggest degree, makes things convenient for the staff to place the laboratory glassware to fume chamber cavity inside.

The implementation principle of the mechanical limiting device of the fume chamber cabinet door in the embodiment of the application is as follows: when the staff lifted up the cabinet door 2, the convex limiting columns 42 at the two ends of the handle 3 contacted with the lower sides of the limiting blocks 41, so that the limiting blocks 41 block the ascending of the cabinet door 2, and the condition that the cabinet door 2 ascends due to the fact that the experimenter touches the cabinet door 2 cannot occur. When the experimental equipment needs to be installed in the ventilation cabinet, a worker presses the key 435 to drive the limiting column 42 to contract and retract the pull handle 3, so that the limiting column 42 is not in contact with the limiting block 41 when the cabinet door 2 rises, and the cabinet door 2 is convenient to open.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a mechanical stop device (4) of fume chamber cabinet door which characterized in that: the device comprises a limiting block (41) fixedly connected to the marked position of an upright post (1) and a limiting post (42) which is matched and clamped with the limiting block (41) and is arranged on any side of a fume hood door (2);

the limiting column (42) is slidably mounted on the cabinet door (2), and the mechanical limiting device (4) further comprises a control assembly (43) for pulling the limiting column (42) to retract and pop up on the cabinet door (2).

2. The mechanical stop device of a fume hood cabinet door according to claim 1, characterized in that: the cabinet door is characterized in that a mounting sleeve (44) which is used for mounting the limiting column (42) and has two closed ends is sleeved on the limiting column (42), the mounting sleeve (44) is fixed on the cabinet door (2), one end of the limiting column (42) penetrates out of the mounting sleeve (44), the other end of the limiting column (42) is fixedly connected with a pull rod (45) which is arranged along the length direction of the limiting column (42), and the pull rod (45) penetrates out of the mounting sleeve (44);

and an extension spring (46) with one end fixed with the end part of the limiting column (42) and the other end fixed with the mounting sleeve (44) and integrally sleeved on the pull rod (45) is further arranged in the mounting sleeve (44).

3. The mechanical stop device of a fume hood cabinet door according to claim 1, characterized in that: the control assembly (43) is arranged in an accommodating groove (32) formed in the handle (3); the limiting column (42) is used for being connected with the control component (43) in the handle (3).

4. The mechanical stop device of a fume hood cabinet door according to claim 3, characterized in that: the control assembly (43) comprises a substrate (431) installed in the accommodating groove (32), a sliding block (432) connected on the substrate (431) in a sliding mode, a pull rope (433) with one end fixed with the sliding block (432) and the other end fixed with the pull rod (45), an installation cover (434) arranged on the substrate (431) and provided with openings at two ends, a strip-shaped hole (4342) formed in the installation cover (434) and a key (435) installed in the strip-shaped hole (4342) and used for pushing the sliding block (432).

5. The mechanical stop device of a fume hood cabinet door according to claim 4, characterized in that: a push block (4351) is fixedly connected to the lower side of the key (435), and a push groove (4322) is formed in the sliding block (432);

the wall of the push groove (4322) far away from the pull rope (433) is an inclined surface inclined to one side far away from the pull rope (433), and the lower edge of the push block (4351) is in contact with the upper edge of the inclined surface of the push groove (4322).

6. The mechanical stop device of a fume hood cabinet door according to claim 4, characterized in that: the edge of the lower side of the key (435) is fixedly connected with a plurality of limiting plates (4352) which circumferentially surround along the key (435), and the limiting plates (4352) are fixedly connected with clamping blocks (4353) which are used for being clamped with the strip-shaped holes (4342).

7. The mechanical stop device of a fume hood cabinet door according to claim 4, characterized in that: an inserting rod (4314) is fixedly connected to the base plate (431), and an inserting tube (4354) sleeved on the inserting rod (4314) is fixedly connected to the key (435);

the inserted link (4314) is sleeved with a return spring (436), and the return spring (436) is positioned in the inserted pipe (4354).

8. The mechanical stop device of a fume hood cabinet door according to claim 4, characterized in that: the base plate (431) is fixedly connected with two supporting blocks (4315), connecting rods (437) rotatably connected with the supporting blocks (4315) penetrate through the two supporting blocks (4315), two ends of each connecting rod (437) are located on the outer sides of the two supporting blocks (4315), two ends of each connecting rod (437) are vertically and fixedly connected with arrangement rods (438), and one end of each arrangement rod (438) is fixedly connected with the corresponding connecting rod (437);

a supporting hole (4355) is formed in the push block (4351) in a penetrating manner, and the other end of the arrangement rod (438) is inserted into the supporting hole (4355).

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