An explosion-proof high and low temperature humidity test chamber

Abstract

The present invention discloses an explosion-proof high and low temperature humidity test box, which can limit the opening angle of the box door and reduce the danger during explosion; it includes a box body and an explosion-proof module, the box body is provided with a test chamber, one side of the test chamber is open and the open end is closed by a box door, and the box door is installed on the box body; a chain is set outside the box body and the box door, and the chain is in a non-tightened state in the initial state; when the explosion occurs, the box door is opened to tighten the chain, thereby limiting the maximum opening angle of the box door. The present invention can effectively prevent the box door from being directly opened when the test chamber explodes by restraining the box door with a chain, thereby reducing the danger, and at the same time, the box door can be opened at a certain angle to quickly dissipate the high-pressure airflow in the test chamber, which can effectively prevent the expansion of the explosion. After the chain is controlled by a swing arm, the opening and closing of the swing arm and the box door can be quickly controlled by a simple operation of the handle, thereby ensuring convenience while also ensuring explosion-proof protection performance.

Description

Technical Field

[0001] The invention relates to a test box, in particular to an explosion-proof high-low temperature and humidity test box. Background Art

[0002] High and low temperature humidity test chamber is mainly used for high and low temperature humidity shock test of samples. In actual use, due to impact and other reasons, the test samples may explode, the air pressure in the chamber may be too high, and the chamber door may pop open. At this time, the rushing airflow may damage the surrounding equipment and cause harm to the surrounding staff, and the fragments produced by the explosion and the popped-open chamber door may easily hit the staff and equipment, so there are relatively large safety hazards.

[0003] During the testing of the existing high and low temperature and humidity test chambers, it was found that if the pressure in the chamber does not rise explosively, the probability of explosion can be greatly reduced if the pressure can be released in time. In the event of an explosion, if the chamber door is opened at a certain angle and is restricted from directly opening, it can effectively prevent fragments and the chamber door from hitting people and objects around. However, there is no similar design at present, and it is necessary to carry out pressure relief and explosion-proof design for the high and low temperature and humidity test chamber, so this case proposes an explosion-proof high and low temperature and humidity test chamber. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide an explosion-proof high and low temperature humidity test chamber, which can limit the opening angle of the chamber door and reduce the danger of explosion.

[0005] To achieve the above-mentioned purpose, the present invention provides an explosion-proof high and low temperature humidity test chamber, comprising a chamber body and an explosion-proof module. The chamber body is provided with a test chamber, one side of the test chamber is open and the open end is closed by a chamber door, and the chamber door is installed on the chamber body; a chain is sleeved outside the chamber body and the chamber door, and the chain is in a non-tensioned state in the initial state; when an explosion occurs, the chamber door opens to tighten the chain, thereby limiting the maximum opening angle of the chamber door.

[0006] As a further improvement of the present invention, the chain belongs to an explosion-proof module and the chain includes a first chain and a second chain. The explosion-proof module includes a chain supporting ring, a first locking rod, a second locking rod, and a third locking rod. There are multiple chain supporting rings and they are respectively installed on the three outer side surfaces of the box body and the outer side of the box door. There are two first locking rods and they are respectively installed on both sides of the box body, the second locking rod is installed on the box door, and the third locking rod is installed on the side of the box body away from the box door; the first locking rod, the second locking rod, and the third locking rod can respectively slide through the corresponding chain supporting rings; the two ends of the two first locking rods are respectively assembled with the second locking rod and the third locking rod through the first chain and the second chain.

[0007] As a further improvement of the present invention, hanging rings are respectively installed on both ends of the first locking rod, the second locking rod and the third locking rod, and the two ends of the first chain are respectively assembled with the hanging ring on one end of the first locking rod and the hanging ring on one end of the third locking rod, and the two ends of the second chain are respectively assembled with the hanging ring on the other end of the first locking rod and the hanging ring on one end of the second locking rod; and in the initial state, the second chain and the first chain are in an untensioned state.

[0008] As a further improvement of the present invention, the chain belongs to an explosion-proof module and the chain includes a first chain, a second chain, and a third chain. The explosion-proof module includes a chain supporting ring, a first locking rod, a second locking rod, a third locking rod, and a fourth locking rod. There are multiple chain supporting rings and they are respectively installed on the three outer side surfaces of the box body and the outer side of the box door. The first locking rod and the fourth locking rod are respectively installed on both sides of the box body, the second locking rod is installed on the box door, and the third locking rod is installed on the side of the box body away from the box door; the first locking rod, the second locking rod, the third locking rod, and the fourth locking rod can respectively slide through the corresponding chain supporting ring; the two ends of the first locking rod are respectively assembled with the second locking rod and the third locking rod through the first chain and the second chain; the two ends of the fourth locking rod are respectively assembled with the swing arm and the third locking rod through the first chain and the third chain, and the swing arm and the box door can be assembled in an openable and closable manner.

[0009] As a further improvement of the present invention, it also includes an explosion-proof shell, which is installed on the box body, and an axle seat is provided on the explosion-proof shell. The axle seat and the arm shaft can be assembled in a circular motion. One end of the arm shaft enters the explosion-proof shell and is assembled with the arm shaft gear, and the other end of the arm shaft passes through the axle seat and is assembled with one end of the swing arm. A swing arm protrusion is provided on the other end of the swing arm, and the swing arm is provided with an end of the swing arm protrusion that is engaged with the engaging seat, and the engaging seat is installed on the box door, and the engaging seat is provided with an engaging protrusion. The swing arm protrusion is engaged with the engaging protrusion, and one end of the swing arm that is provided with the swing arm protrusion is engaged between the engaging seat and the box door, and the swing arm cannot pass through the engaging seat along its length direction; the arm shaft gear is meshed with the arm shaft rack for transmission, and a rack slide is provided on the arm shaft rack, and the arm shaft rack is engaged with the guide slide groove, and the guide slide groove is provided on the guide plate, and the guide plate is installed on the explosion-proof shell.

[0010] As a further improvement of the present invention, the arm shaft gear, arm shaft rack, arm shaft, swing arm, snap seat, third chain, and fourth locking rod constitute a swing arm mechanism; there are two swing arm mechanisms, which are respectively installed at the upper and lower ends of the box door; the arm shaft racks of the two swing arm mechanisms are also respectively engaged with the first drive tooth and the second drive tooth for transmission, the first drive tooth and the second drive tooth are engaged with each other for transmission, the first drive tooth and the second drive tooth are respectively mounted on the first gear shaft and the second gear shaft, and the first gear shaft and the second gear shaft are respectively installed on the explosion-proof shell.

[0011] As a further improvement of the present invention, a rack plate is also installed on the arm shaft rack of one of the swing arm mechanisms, the rack plate is assembled or pressed with one end of the rack spring, the other end of the rack spring is pressed or assembled with the force plate, the force plate is installed on the explosion-proof shell, and the rack spring applies a thrust to the rack plate away from the force plate, so that in the initial state, the arm shaft rack is at the end farthest from the force plate, and at this time the arm shaft rack drives the swing arm to be at a rotation angle farthest from the engagement seat.

[0012] As a further improvement of the present invention, one end of the first gear shaft passes through the explosion-proof housing and is assembled with a bevel gear, the bevel gear is installed in the tapered hole and meshes with the teeth on the inner wall of the tapered hole for transmission, the tapered hole is arranged on a tapered sleeve, the tapered sleeve is axially slidable and non-circumferentially rotatable on the pulley shaft, the pulley shaft is installed on the transmission housing and the belt housing, and the transmission housing and the belt housing are respectively installed on the box door;

[0013] The transmission housing is provided with a transmission hole, the cone sleeve is installed in the transmission hole so as to be axially slidable and circumferentially rotatable, and a cone sleeve spring is installed between the cone sleeve and the closed end of the transmission hole, and the cone sleeve spring applies a thrust force to the cone sleeve away from the transmission hole; the cone sleeve is provided with an annular groove, and the limit bolt passes through the transmission housing and enters the annular groove, thereby limiting the maximum displacement of the cone sleeve in the axial direction;

[0014] The part of the pulley shaft located on the belt shell is equipped with a pulley, which is connected to another pulley through a synchronous belt to form a belt transmission mechanism. The other pulley is mounted on the handle shaft, one end of the handle shaft is assembled with the belt, and the other end passes through the sleeve and is assembled with one end of the handle. The sleeve is installed on the belt shell.

[0015] As a further improvement of the present invention, a notch is provided on the shaft sleeve, and a limit block is installed at a position of the handle shaft corresponding to the notch. The limit block can rotate in the notch and the notch limits the maximum rotation angle of the limit block.

[0016] As a further improvement of the present invention, it also includes a locking member, on which a locking rod and a locking block are respectively provided, the locking rod and the locking block are respectively engaged with the belt shell and can be slidably assembled, and one end of the locking block passes through the belt shell and is pressed against the limit block in the locked state, so that the limit block and the handle shaft cannot rotate;

[0017] The locking member is assembled with one end of the sleeve, the sleeve can be axially slidably mounted on the spring shaft, the spring shaft is mounted on the belt shell, and a locking spring is also mounted on the sleeve and the spring shaft, and the locking spring is used to apply a thrust force to the locking member away from the spring shaft;

[0018] The end of the locking rod is pressed tightly against the end of the end shaft seat, and the end bearing can be axially slidably mounted on the sleeve, and a spring ring is also provided on the sleeve. A switch spring is also mounted on the portion of the sleeve located between the spring ring and the end bearing, and the switch spring applies an elastic force to the end bearing to hinder its movement toward the spring ring; the end bearing is also assembled with one end of the push shaft, and the other end of the push shaft is assembled with the push-twist after passing through the handle, and the push shaft and the handle can be axially slidably assembled.

[0019] The beneficial effects of the present invention are:

[0020] The present invention can effectively prevent the box door from being directly opened when the test chamber explodes by restraining the box door with a chain, thereby reducing the danger. At the same time, the box door can be opened at a certain angle to quickly release the high-pressure airflow in the test chamber, which can effectively prevent the expansion of the explosion. After the chain is controlled by a swing arm, the swing arm and the box door can be quickly controlled by simply operating the handle, thereby ensuring convenience while also ensuring explosion-proof protection performance.

[0021] The pressure relief module of the present invention pushes the pressure relief door open by a certain air pressure to release pressure actively. The structure is simple, and the probability and intensity of explosion in the test chamber can be effectively reduced by active pressure relief, thereby improving safety. In addition, the pressure relief module heats the pressure relief groove by a heating wire assembly, thereby compensating for the impact of opening the pressure relief groove and installing the pressure relief module on the test chamber, so as to ensure the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of embodiment 1;

[0023] Figure 2 is a structural schematic diagram of embodiment 1;

[0024] Figure 3 is a cross-sectional view of the pressure relief module 200 located at the center plane of the inner sleeve 230;

[0025] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5-Figure 8 is a schematic structural diagram of the pressure relief module 200;

[0027] Figure 9-10 is an exploded view of the parts of the pressure relief module 200;

[0028] Figure 11-Figure 12 is an exploded view of some parts of the pressure relief module 200;

[0029] Fig.13 is a structural schematic diagram of embodiment 1;

[0030] Fig.14 is a schematic structural diagram of the explosion-proof module in Example 1;

[0031] Figure 15-16 is a structural diagram of Embodiment 2;

[0032] Figure 17-Figure 18 is a schematic diagram of the structure of the explosion-proof module in the second embodiment;

[0033] Figure 19-Figure 23 It is a partial structural schematic diagram of the explosion-proof module in the second embodiment;

[0034] Fig.24 It is a cross-sectional view of the explosion-proof module in the second embodiment located at the center plane where the axis of the handle shaft 470 is located;

[0035] Fig.25 It is a cross-sectional view of the explosion-proof module in the second embodiment located at the center plane where the axis of the pulley shaft 460 is located;

[0036] Fig.26 It is a cross-sectional view (partial) of the explosion-proof module in the second embodiment located at the center plane where the axis of the spring shaft 481 is located;

[0037] Fig. 27 This is a cross-sectional view of the explosion-proof module in the second embodiment located at the center plane where the axis of the locking block 921 is located;

[0038] Fig.28 It is a schematic diagram of the partial structure of the handle 710 and the belt housing 130;

[0039] Fig.29 It is a schematic diagram of the partial structure of the handle 710 and the handle shaft 470. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0041] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] Embodiment 1

[0043] See also Figure 1-Figure 14The explosion-proof high and low temperature humidity test box of this embodiment includes a box body 100, a pressure relief module 200, and an explosion-proof module. The box body 100 is provided with a test chamber 101, one side of the test chamber 101 is open and the open end is closed by a box door 110, and the box door 110 is installed on the box body 100, and a transparent observation window 111 is provided on the box door 110. Specifically, in this embodiment, one side of the box door 110 is hinged to the box body 100, and the other side is detachably assembled with the box body 100 through a door lock, which is the same as the prior art.

[0044] The box 100 is also provided with a pressure relief groove 102, one end of which is connected to the test chamber 101 and the other end of which passes through the box 100. In this embodiment, the pressure relief groove 102 passes through the top surface of the box 100, and a pressure relief module 200 is installed at the pressure relief groove 102.

[0045] The pressure relief module 200 includes a pressure relief frame 210, a bottom plate 240, and an inner sleeve 230. The two ends of the pressure relief frame 210 are respectively assembled with the bottom plate 240 and the protective net 220. The protective net 220 is provided with a number of through holes, so as to facilitate the discharge of airflow and also protect the pressure relief door 280. The inner sleeve 230 is installed in the pressure relief groove 102. The two ends of the inner sleeve 230 respectively pass through the pressure relief groove 102 and the two ends of the inner sleeve 230 are also provided with edge parts 232. The inner sleeve 230 is clamped in the pressure relief groove 102 (on the box 100) through the edge parts 232 at both ends; the inner sleeve 230 and the bottom plate 240 are respectively provided with a pressure relief channel 231 and a bottom plate hole 241, and the pressure relief channel 231, the bottom plate hole 241, and the test chamber 101 are connected.

[0046] The bottom plate 240 is mounted on the box body 100 , and the edge portion 232 between the bottom plate 240 and the box body 100 is pressed against the box body 100 by the bottom plate 240 to further fix the inner sleeve 230 . A sealing frame 260 is also installed on the base plate 240, and a sealing installation groove 261 is provided on the sealing frame 260. The sealing installation groove 261 is assembled and fixed with the sealing installation part 271 of the sealing belt 270, and the sealing belt 270 is squeezed and sealed with the pressure relief door 280. One end of the pressure relief door 280 is hinged to the base plate 240 through a hinge 281, and the end of the pressure relief door 280 away from the hinge 281 is pressed against a clamping head 511, and the clamping head 511 is assembled with one end of the pressure relief spring 510, and the other end of the pressure relief spring 510 is assembled with a spring cover 512, and the spring cover 512 is assembled with one end of the pressure relief bolt 410, and the other end of the pressure relief bolt 410 passes through the locking beam 291 and is screwed therewith by a thread, and the locking beam 291 is arranged on the pressure relief frame 290, and the pressure relief frame 290 is installed on the base plate 240. When in use, the compression degree of the pressure relief spring 510 can be adjusted by adjusting the distance between the pressure relief bolt 410 and the bottom plate 240, thereby adjusting the opening pressure of the pressure relief door 280. Once the air pressure in the test chamber 101 reaches the opening pressure of the pressure relief door 280, the pressure relief door 280 will be pushed open, and the pressure relief door 280 will rotate upward around the hinge 281 to open, thereby quickly discharging the air pressure in the test chamber 101 to reduce the probability of explosion. When an explosion occurs, the air pressure directly pushes the pressure relief door open to release pressure, thereby reducing the impact of the explosion on the box door.

[0047] Preferably, there are two of each of the clamping head 511, the pressure relief spring 510, the spring cover 512, and the pressure relief bolt 410. The two pressure relief bolts 410 are assembled with the extrusion plate 292. The extrusion plate 292 applies pressure to the two spring covers 512, so that the extrusion force on the two pressure relief springs 510 is substantially the same, that is, the opening resistance applied by the two clamping heads 511 to the pressure relief door 280 is the same. This design is mainly to balance the opening pressure of the pressure relief door and ensure that the pressure relief door can be opened quickly under the preset air pressure.

[0048] See also Figure 3-Figure 4 Preferably, a sealing plate 282 is installed on the end surface of the pressure relief door 280 in contact with the sealing belt 270, and the sealing plate 282 is squeezed and sealed with the sealing belt 270. This design is mainly considered that the pressure relief door 280 and the sealing belt 270 need to have a certain degree of sealing, and the sealing plate 282 and the sealing belt 270 squeeze and seal can effectively reduce the requirements for the flatness of the pressure relief door 280, thereby reducing costs and ensuring corresponding sealing performance.

[0049] Preferably, the box body 100 is provided with a pressure relief groove 102, and after the pressure relief module 200 is installed at the pressure relief groove 102, the original insulation structure of the box body is greatly affected. In order to prevent condensation or even frost at the pressure relief groove 102 during the low temperature test, it is necessary to lay a heating wire around the pressure relief groove 102, and its working conditions are the same as the working conditions of the heating wire of the door frame and box frame of the test box, so it is necessary to connect this part of the electrical wiring with the electrical part of the test box. For this, the present embodiment also adds a heating wire assembly 250, and the heating wire assembly 250 includes an upper shell 251 and a lower shell 252. The upper shell 251 is mounted on the lower shell 252, and the screws pass through the upper shell 251 and the lower shell 252 and are assembled with the bottom plate 240; between the upper shell 251 and the lower shell 252 is a hollow heating chamber 253, and a heating wire is installed in the heating chamber 253, and the heating wire generates heat after being energized. When in use, the heating wire is powered as needed, and the heating efficiency and maximum heating temperature of the heating wire can be controlled by controlling the power supply parameters of the heating wire. This eliminates or reduces the impact of the pressure relief hole 102 and the pressure relief module 200 on the box. The heat of the heating wire is transferred to the upper shell 251 and the lower shell 252, and then to the bottom plate 240 and the inner sleeve 230, thereby effectively compensating the pressure relief groove to improve the accuracy of the test.

[0050] See also Figure 1-Figure 2 , Figure 13-Figure 14 In order to prevent the explosion, the pressure relief module fails to release pressure in time or fails to release pressure quickly, causing the door 110 to be blown open, resulting in certain safety hazards, the present embodiment further adds an explosion-proof module, which includes a chain support ring 330, a first chain 321, a second chain 322, a first locking rod 311, a second locking rod 312, and a third locking rod 313. There are multiple chain support rings 330 and they are respectively installed on the three outer sides of the box body 100 and the outer side of the door 110. There are two first locking rods 311 and they are respectively installed on both sides of the box body 100. The second locking rod 312 is installed on the door 110. The third locking rod 313 is installed on the side of the box body away from the door. The first locking rod 311, the second locking rod 312, The third locking rod 313 can slide through the corresponding chain support ring 330 respectively, so as to realize the movable assembly of the first locking rod 311, the second locking rod 312, the third locking rod 313 and the box body 100 and the door 110; the first locking rod 311, the second locking rod 312, and the third locking rod 313 are respectively installed with hanging rings 341 at both ends, and the two ends of the first chain 321 are respectively assembled with the hanging ring 341 on one end of the first locking rod 311 and the hanging ring 341 on one end of the third locking rod 313, and the two ends of the second chain 322 are respectively assembled with the hanging ring 341 on the other end of the first locking rod 311 and the hanging ring 341 on one end of the second locking rod 312; and in the initial state, the second chain 322 and the first chain 321 are in an untensioned state.

[0051] Once an explosion occurs in the test chamber 101, the impact force will push open the door 110, and when the door 110 is opened, the second chain 322 and the first chain 321 will be stretched until the door reaches the maximum opening angle when the second chain 322 and the first chain 321 are tightened. At this time, the door is not fully opened, but the pressure can be quickly released, so as to buffer the airflow after the explosion and prevent the impact force of the explosion from directly opening the door and bringing out debris to cause safety hazards. When the door is accidentally opened, the second chain 322 and the first chain 321 are tightened, and the forces of the second chain 322 and the first chain 321 are relatively evenly distributed to the four faces of the front, back, left and right of the box body (especially the left and right corners at the back), so as to effectively resist the impact force of the explosion.

[0052] Preferably, a safety hook is installed on one end of the second chain 322, which can be opened manually to separate from the corresponding hanging ring 341, so that the restriction on the door can be released, so that the door can be fully opened without affecting the samples entering and exiting the test chamber.

[0053] Embodiment 2

[0054] In the first embodiment, the two second chains 322 of the explosion-proof module are quickly disassembled and assembled through safety hooks, thereby minimizing the restriction on the rapid opening of the door 110 after adding the explosion-proof module. However, this method still requires the independent operation of the two safety hooks, which increases the process, and the opening of the second chain may also affect the normal opening and closing of the door. Therefore, based on the existing usage habits and convenience, the explosion-proof module in the first embodiment is improved so that the door 110 can be opened and closed quickly without significantly increasing the process. This not only retains the explosion-proof function, but also increases convenience and is more convenient to use.

[0055] See also Figure 15-Figure 29In the explosion-proof module of this embodiment, one of the first locking rods 311 is replaced by a fourth locking rod 314, and one of the second chains 322 is replaced by a third chain, and an explosion-proof shell 610 is added. The explosion-proof shell 610 is installed on the box body 100, and a shaft seat 611 is provided on the explosion-proof shell 610. The shaft seat 611 and the arm shaft 430 can be assembled in a circular rotation. One end of the arm shaft 430 enters the explosion-proof shell 610 and is assembled with the arm shaft gear 820, and the other end of the arm shaft 430 passes through the shaft seat 611 and is assembled with one end of the swing arm 620. The other end of the swing arm 620 A swing arm protrusion 621 is provided on the swing arm 620, one end of which is provided with the swing arm protrusion 621 and is engaged with the engaging seat 120, the engaging seat 120 is installed on the box door 110, and the engaging seat 120 is provided with an engaging protrusion 121, the swing arm protrusion 621 is engaged with the engaging protrusion 121, one end of which is provided with the swing arm protrusion 621 is engaged between the engaging seat 120 and the box door 110, and the swing arm 620 cannot pass through the engaging seat 120 along its length direction (a direction perpendicular to the arm shaft 430 or a horizontal direction). This design is mainly to restrain the box door through the swing arm 620 when the box door is opened by explosion.

[0056] The swing arm 620 is provided with a hanging ring 341, which is assembled with one end of the third chain 323, and the other end of the third chain 323 is assembled with the hanging ring 341 on one end of the fourth locking rod 314. The fourth locking rod 314 passes through the pipe sleeve 420 and the corresponding chain support ring 330 and is assembled with the corresponding first chain 321. The fourth locking rod 314 is slidably assembled with the pipe sleeve 420, and the pipe sleeve 420 is installed on the explosion-proof shell 610. The engaging seat 120 is axially slidably assembled with the second locking rod 312. One end of the second locking rod 312 passes through the engaging seat 120 and is assembled with the corresponding hanging ring 341. The hanging ring 341 cannot pass through the engaging seat 120, thereby limiting the maximum displacement of the second locking rod 312 and the engaging seat 120.

[0057] The arm shaft gear 820 is meshed with the arm shaft rack 810 for transmission. The arm shaft rack 810 is provided with a rack slide bar 811. The arm shaft rack 810 is engaged and assembled with a guide slide groove 631. The guide slide groove 631 is provided on the guide plate 630. The guide plate 630 is installed on the explosion-proof shell 610.

[0058] The arm shaft gear 820, arm shaft rack 810, arm shaft 430, swing arm 620, snap seat 120, pipe sleeve 420, third chain 323, and fourth locking rod 314 constitute a swing arm mechanism. In this embodiment, there are two swing arm mechanisms, which are respectively installed at the upper and lower ends of the box door, so as to better explosion-proof the box door without blocking the observation window.

[0059] A rack plate 812 is also installed on the arm shaft rack 810 of one of the swing arm mechanisms. The rack plate 812 is assembled or pressed against one end of the rack spring 520. The other end of the rack spring 520 is pressed or assembled against the force plate 612. The force plate 612 is installed on the explosion-proof shell 610, and the rack spring 520 applies a thrust to the rack plate 812 away from the force plate 612, so that in the initial state, the arm shaft rack 810 is at the end farthest from the force plate 612. At this time, the arm shaft rack 810 drives the swing arm to be at a rotation angle ( Fig.15 The middle swing arm rotates 90°) so that the box door 110 is not blocked, and the box door 110 can be opened and closed normally. This is the unlocked state of the swing arm.

[0060] The arm shaft racks 810 of the two swing arm mechanisms are also meshed with the first drive teeth 831 and the second drive teeth 832 for transmission, the first drive teeth 831 and the second drive teeth 832 are meshed with each other for transmission, the first drive teeth 831 and the second drive teeth 832 are respectively mounted on the first gear shaft 440 and the second gear shaft 450, and the first gear shaft 440 and the second gear shaft 450 are respectively mounted on the explosion-proof shell 610. In this embodiment, the axial length of the second drive teeth 832 is greater than the axial length of the first drive teeth 831, so that the second drive teeth 832 are meshed with the first drive teeth 831 and the corresponding arm shaft racks 810 for transmission at the same time. A toothless section 813 is provided on one end of the arm shaft rack 810 close to the first driving tooth 831 and the second driving tooth 832, and no locking teeth are provided on the toothless section 813. This ensures that when in use, within the maximum displacement range of the arm shaft rack 810, the second driving tooth 832 will not engage with the arm shaft rack 810 corresponding to the first driving tooth 831 to prevent interference and jamming.

[0061] The design of the first driving teeth 831 and the second driving teeth 832 can make the two arm shaft racks 810 move away from or towards each other synchronously, thereby driving the two swing arms to rotate toward or away from the corresponding engaging seats 120 synchronously.

[0062] One end of the first gear shaft 440 passes through the explosion-proof shell 610 and is assembled with the bevel gear 840. The bevel gear 840 is installed in the tapered hole 851 and meshes with the teeth on the inner wall of the tapered hole 851 for transmission. The tapered hole 851 is set on the tapered sleeve 850. The tapered sleeve 850 can be axially slidable but not circumferentially rotatable on the pulley shaft 460. The pulley shaft 460 is installed on the transmission shell 140 and the belt shell 130. The transmission shell 140 and the belt shell 130 are respectively installed on the box door 110. The transmission housing 140 is provided with a transmission hole 141, and the cone sleeve 850 is installed in the transmission hole 141 so as to be axially slidable and circumferentially rotatable, and a cone sleeve spring 530 is installed between the cone sleeve 850 and the closed end of the transmission hole 141, and the cone sleeve spring 530 applies a thrust to the cone sleeve 850 away from the transmission hole 141; the cone sleeve 850 is provided with an annular groove 852, and the limit bolt 910 enters the annular groove 852 after passing through the transmission housing 140, thereby limiting the maximum axial displacement of the cone sleeve 850.

[0063] The pulley shaft 460 is located on the part of the belt shell 130 and is equipped with a pulley 861. This pulley 861 is connected to another pulley 861 through a synchronous belt 860 to form a belt transmission mechanism. The other pulley 861 is mounted on the handle shaft 470. One end of the handle shaft 470 is assembled with the belt shell 130, and the other end passes through the sleeve 150 and is assembled with one end of the handle 710. The sleeve 150 is installed on the belt shell 130. When the handle 710 rotates, it can drive the handle shaft 470 to rotate synchronously, thereby driving the pulley shaft 460 to rotate. The pulley shaft 460 drives the first gear shaft 440 to rotate, which also drives the two arm shaft racks 810 to move, thereby driving the two swing arms 620 to rotate.

[0064] Preferably, the sleeve 150 is provided with a notch 151, and a limit block 471 is installed at the position of the handle shaft 470 corresponding to the notch 151, and the limit block 471 can rotate in the notch 151 and the notch 151 limits the maximum rotation angle of the limit block 471. This design mainly limits the rotation angle of the handle shaft 470, thereby limiting the rotation angle of the swing arm 620, so as to prevent the swing arm 620 from rotating too much or too little to hinder the opening and closing of the door.

[0065] Preferably, a locking member 920 is further included, on which a locking rod 922 and a locking block 921 are respectively provided. The locking rod 922 and the locking block 921 are respectively engaged with the belt shell 130 and can be slidably assembled. After one end of the locking block 921 passes through the belt shell 130, it is pressed against the limit block 471 in the locked state, so that the limit block 471 and the handle shaft 470 cannot rotate, so as to maintain the locking state of the swing arm.

[0066] The locking member 920 is assembled with one end of the sleeve 482, and the sleeve 482 can be axially slidably mounted on the spring shaft 481, and the spring shaft 481 is mounted on the belt shell 130. The sleeve 482 and the spring shaft 481 are also mounted with a locking spring 550, and the locking spring 550 is used to apply a thrust force to the locking member 920 away from the spring shaft 481, so that the locking block 921 keeps clamping the limit block 471 ( Fig. 27 state).

[0067] The end of the locking rod 922 is pressed against the end of the end shaft seat 870, and the end bearing 870 can be axially slidably mounted on the sleeve 150. A spring ring 152 is also provided on the sleeve 150. A switch spring 540 is also mounted on the portion of the sleeve 150 located between the spring ring 152 and the end bearing 870. The switch spring 540 applies an elastic force to the end bearing 870 to prevent it from moving toward the spring ring 152, so that in the initial state, the end bearing cannot push the locking rod 922 to move toward the belt case 130.

[0068] The end bearing 870 is also assembled with one end of the push shaft 730, and the other end of the push shaft 730 passes through the handle 710 and is assembled with the push knob 720. The push shaft 730 and the handle 710 can be axially slidably assembled.

[0069] Fig. 27 , Fig.15 The swing arm 620 is in a locked state for the box door 110. At this time, if an explosion occurs in the sample chamber 101, the air pressure will open the box door 110. When the box door opens, the swing arm 620 is driven to disengage from the inner cylinder arm shaft 430, and then the third chain 323, the first chain 321, and the second chain 322 are tightened respectively to limit the maximum opening angle of the box door, thereby achieving the effect of explosion prevention and improving safety.

[0070] When the door needs to be opened, the push knob 720 is pressed, and the push knob 720 drives the end bearing 870 to squeeze the switch spring 540, so that the end bearing 870 pushes the locking rod 922 to squeeze the locking spring 550, until the locking block 921 is separated from the limit block 471, and the handle 710 is rotated to the maximum angle, and the handle 710 drives the two swing arms 620 to rotate away from each other to the maximum angle to leave the door. Release the push knob, the push knob is reset under the action of the switch spring, and the limit block 471 is separated from the locking block 921 at this time, and the locking block 921 extends to the slot 151 under the action of the locking spring 550 to reset, so as to prevent the limit block 471 from rotating in the opposite direction, thereby keeping the handle 710 in the open state. Then the door can be opened, and after the door is opened, the bevel gear 840 is separated from the tapered hole 851, and the rack spring 520 maintains the swing arm 620 in the open state. When it is needed, close the box door so that the bevel gear 840 is installed in the tapered hole 851 and meshes with it for transmission; then turn the handle 710 to reset the swing arm 620 so that it can be restored to the state of engagement with the engagement seat 120, that is, the locked state.

[0071] Preferably, the limit block 471 is further provided with a limit inclined surface 472. When the limit block 471 is switched from the open state to the locked state, the handle 710 is directly rotated so that the limit inclined surface 472 is pressed against the end of the locking block 921, and finally the locking block 921 is pushed open, so that the limit block 471 is rotated to Fig. 27 The locking block 921 can be reset to the state. This design is mainly for the convenience of use and to provide damping for the rotation of the handle 710 to prevent the arm shaft rack from driving the handle 710 to reverse under the action of the rack spring 520. A slightly larger force can be used to drive the limit block 471 to pass through the locking block 921, which greatly facilitates use.

[0072] In this embodiment, a mechanical door lock is used between the box door 110 and the box body 100, and the handle shaft 470 can be connected to the mechanical door lock (coaxially assembled with the door lock shaft), so that operating the handle 710 can simultaneously operate the swing arm 620 and the mechanical door lock, which greatly facilitates use. The convenience is the same as the prior art, but an explosion-proof function is added.

[0073] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0074] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An explosion-proof high and low temperature humidity test box, comprising a box body and an explosion-proof module, wherein the box body is provided with a test chamber, one side of the test chamber is open and the open end is closed by a box door, and the box door is installed on the box body; wherein: The chain is mounted outside the box body and the door, and the chain is in a non-tensioned state in the initial state; when the explosion occurs, the door opens to tighten the chain, thereby limiting the maximum opening angle of the door; The chain belongs to the explosion-proof module and the chain includes a first chain, a second chain and a third chain. The explosion-proof module includes a chain support ring, a first locking rod, a second locking rod, a third locking rod and a fourth locking rod. There are multiple chain support rings and they are respectively installed on three outer sides of the box body and the outer side of the box door. The first locking rod and the fourth locking rod are respectively installed on both sides of the box body, the second locking rod is installed on the box door, and the third locking rod is installed on the side of the box body away from the box door; the first locking rod, the second locking rod, the third locking rod and the fourth locking rod can slide through the corresponding chain support rings respectively; the two ends of the first locking rod are respectively assembled with the second locking rod and the third locking rod through the first chain and the second chain; the two ends of the fourth locking rod are respectively assembled with the swing arm and the third locking rod through the first chain and the third chain, and the swing arm and the box door can be assembled in an openable and closable manner; The cam is provided with a toothed plate, and the toothed plate ... The arm shaft gear, arm shaft rack, arm shaft, swing arm, snap seat, third chain, and fourth locking rod constitute a swing arm mechanism; there are two swing arm mechanisms, which are respectively installed at the upper and lower ends of the box door; the arm shaft racks of the two swing arm mechanisms are also respectively meshed with the first drive tooth and the second drive tooth for transmission, the first drive tooth and the second drive tooth are meshed with each other for transmission, the first drive tooth and the second drive tooth are respectively mounted on the first gear shaft and the second gear shaft, and the first gear shaft and the second gear shaft are respectively installed on the explosion-proof shell; A rack plate is also installed on the arm shaft rack of one of the swing arm mechanisms. The rack plate is assembled or pressed with one end of the rack spring, and the other end of the rack spring is pressed or assembled with the force plate. The force plate is installed on the explosion-proof shell, and the rack spring applies a thrust to the rack plate away from the force plate, so that in the initial state, the arm shaft rack is at the end farthest from the force plate. At this time, the arm shaft rack drives the swing arm to be at a rotation angle farthest from the engagement seat.

2. The explosion-proof high and low temperature humidity test chamber according to claim 1, characterized in that: One end of the first gear shaft passes through the explosion-proof housing and is assembled with the bevel gear. The bevel gear is installed in the tapered hole and meshes with the teeth on the inner wall of the tapered hole for transmission. The tapered hole is arranged on a tapered sleeve. The tapered sleeve is mounted on the pulley shaft in an axially slidable and non-circumferentially rotatable manner. The pulley shaft is mounted on a transmission housing and a belt housing. The transmission housing and the belt housing are respectively mounted on the box door. The transmission housing is provided with a transmission hole, the cone sleeve is installed in the transmission hole so as to be axially slidable and circumferentially rotatable, and a cone sleeve spring is installed between the cone sleeve and the closed end of the transmission hole, and the cone sleeve spring applies a thrust force to the cone sleeve away from the transmission hole; the cone sleeve is provided with an annular groove, and the limit bolt passes through the transmission housing and enters the annular groove, thereby limiting the maximum displacement of the cone sleeve in the axial direction; The part of the pulley shaft located on the belt shell is equipped with a pulley, which is connected to another pulley through a synchronous belt to form a belt transmission mechanism. The other pulley is mounted on the handle shaft, one end of the handle shaft is assembled with the belt, and the other end passes through the sleeve and is assembled with one end of the handle. The sleeve is installed on the belt shell.

3. The explosion-proof high and low temperature humidity test chamber according to claim 2, characterized in that: The shaft sleeve is provided with a notch, and a limit block is installed at a position of the handle shaft corresponding to the notch. The limit block can rotate in the notch and the notch limits the maximum rotation angle of the limit block.

4. The explosion-proof high and low temperature humidity test chamber as claimed in claim 3, characterized in that: It also includes a locking member, on which a locking rod and a locking block are respectively provided, the locking rod and the locking block are respectively engaged with the belt shell and can be slidably assembled, and one end of the locking block passes through the belt shell and is pressed against the limit block in the locking state, so that the limit block and the handle shaft cannot rotate; The locking member is assembled with one end of the sleeve, the sleeve can be axially slidably mounted on the spring shaft, the spring shaft is mounted on the belt shell, and a locking spring is also mounted on the sleeve and the spring shaft, and the locking spring is used to apply a thrust force to the locking member away from the spring shaft; The end of the locking rod is pressed tightly against the end of the end shaft seat, and the end bearing can be axially slidably mounted on the sleeve, and a spring ring is also provided on the sleeve. A switch spring is also mounted on the portion of the sleeve located between the spring ring and the end bearing, and the switch spring applies an elastic force to the end bearing to hinder its movement toward the spring ring; the end bearing is also assembled with one end of the push shaft, and the other end of the push shaft is assembled with the push-twist after passing through the handle, and the push shaft and the handle can be axially slidably assembled.

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