CN112526325A - Multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box - Google Patents
Multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box Download PDFInfo
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- CN112526325A CN112526325A CN202011537691.0A CN202011537691A CN112526325A CN 112526325 A CN112526325 A CN 112526325A CN 202011537691 A CN202011537691 A CN 202011537691A CN 112526325 A CN112526325 A CN 112526325A
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- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
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Abstract
The invention discloses a low-temperature damp-heat vibration comprehensive experiment box of a multifunctional signal processing board, wherein a temperature and humidity control air pump unit controls the humidity and the temperature of air flow supplied by a temperature and humidity control air flow supply pipe, and air flow sprayed out by a temperature and humidity control air flow spraying mechanism can act on the signal processing board on a comprehensive vibration platform; each direction and angle that atmospheric control air current blowout mechanism spouts the air current all can solitary control to adjust the humiture in the outer casing and the effort condition of air current to the signal processing board through the blowout air current condition of controlling each atmospheric control air current blowout mechanism, can realize the experiment under various atress and vibration, humiture, improve the experiment of signal circuit board adaptability under various environment or even sudden change environment, improve the true simulation to signal circuit board to in-service use, guarantee to have sufficient experiment to signal circuit board before the volume is produced.
Description
Technical Field
The invention particularly relates to a low-temperature damp-heat vibration comprehensive experiment box of a multifunctional signal processing board, and relates to the field related to low-temperature damp-heat vibration.
Background
At present, for related equipment used in some low-temperature vibration occasions, before large-scale production after the design of the related equipment, a corresponding low-temperature vibration experiment needs to be carried out on a signal circuit board inside the related equipment so as to ensure the service life of the signal circuit board and the working reliability of the signal circuit board. In this regard, a special comprehensive experiment box is required to perform vibration experiments on the signal processing board at a certain temperature and humidity. However, for some devices used under the conditions of vibration, humidity and the like, the conditions of the acting forces of the devices such as vibration, temperature and humidity, airflow and the like in actual use are variable, and in an experimental state, the factors in the experimental box are often regular, however, the problems that the acting forces of the vibration, the temperature and humidity, the airflow and the like in the regular patterns are difficult to realize to change the conditions in actual use are caused, so that the experimental condition and the actual use condition have great difference, the service performance and the service life of a subsequent signal circuit board are influenced, and even the first batch of produced devices are difficult to reliably use, and resources are wasted.
Disclosure of Invention
Therefore, in order to solve the above-mentioned disadvantages, the present invention provides a comprehensive experimental box for low-temperature damp-heat vibration of a multifunctional signal processing board.
The invention is realized in such a way that a multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box is constructed, which comprises a fixed base, a transverse vibration mechanism, a transverse vibration platform, a longitudinal vibration mechanism, a comprehensive vibration platform, a temperature and humidity control airflow supply pipe, a temperature and humidity control airflow ejection mechanism and an outer case, wherein the transverse vibration mechanism is arranged at the upper end of the fixed base, the transverse vibration platform is arranged at the top of the transverse vibration mechanism, the comprehensive vibration platform is supported and connected at the top of the transverse vibration platform by adopting the longitudinal vibration mechanism, the outer case extending upwards is arranged on the upper periphery of the fixed base, the transverse vibration mechanism, the transverse vibration platform, the longitudinal vibration mechanism and the comprehensive vibration platform, and the multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box is characterized in that a plurality of groups of temperature and humidity control airflow ejection mechanisms are arranged on the peripheral, the temperature and humidity control airflow ejection mechanism is connected with the temperature and humidity control airflow supply pipe, the temperature and humidity control airflow supply pipe is connected with the temperature and humidity control air pump unit, so that the temperature and humidity of airflow supplied by the temperature and humidity control airflow supply pipe are controlled by the temperature and humidity control air pump unit, and the ejected airflow of the temperature and humidity control airflow ejection mechanism can act on a signal processing board on the comprehensive vibration platform; the direction and the angle of the air flow sprayed by each temperature and humidity control air flow spraying mechanism can be independently controlled, so that the temperature and humidity in the outer box shell and the acting force condition of the air flow on the signal processing board can be adjusted by controlling the condition of the sprayed air flow of each temperature and humidity control air flow spraying mechanism.
Further, as preferred, unable adjustment base's bottom adopts rag bolt to fix in relevant position, lateral vibration mechanism includes lateral vibration slider and lateral vibration driver, the bottom slidable cooperation of lateral vibration slider on unable adjustment base, the top at lateral vibration slider is fixed to the lateral vibration platform, one side of lateral vibration slider is connected the output of lateral vibration driver, the lateral vibration driver is fixed on unable adjustment base, the setting that the vibration amplitude, the vibration frequency of lateral vibration driver are all adjustable.
Further, as preferred, the longitudinal vibration mechanism is a longitudinal vibration driver, the vibration amplitude and the vibration frequency of the longitudinal vibration driver in the vertical direction are adjustable, the top of the longitudinal vibration mechanism is hinged with the middle of the bottom of the comprehensive vibration platform, and two auxiliary vibration drivers are hinged between the periphery of the top of the transverse vibration platform and the periphery of the bottom of the comprehensive vibration platform.
Further, preferably, a telescopic auxiliary mechanism is arranged at the upper end or the lower end of at least one of the auxiliary vibration drivers so as to provide a vibration moving space for the longitudinal vibration mechanism and the auxiliary vibration drivers, and the vibration amplitude and the vibration frequency of the auxiliary vibration drivers are both adjustable.
Further, as preferred, be provided with a plurality of locating pins and fixed pin on synthesizing the vibration platform, locating pin and fixed pin are used for treating the experiment the signal processing board is fixed locking.
Further, as a preferred option, the temperature and humidity control airflow ejection mechanism comprises an outer cover body, an inner fixing block, a side connecting frame, an elastic cover sheet, a first airflow grid, a second airflow grid and a grid high-frequency adjusting mechanism, wherein a through hole is formed in the outer cover body, the end portion of the temperature and humidity control airflow supply pipe penetrates through the through hole, the inner fixing block is fixedly arranged on the inner side of the outer cover body, the side connecting frames which are arranged at intervals are arranged on two sides of the inner fixing block, the elastic cover sheet is arranged between the end portions of the two side connecting frames, the first airflow grid and the second airflow grid which are hinged on a hinge shaft on the side connecting frame are arranged in a space surrounded by the elastic cover sheet and the side connecting frames, the first airflow grid and the second airflow grid are symmetrically arranged side by side at intervals, and the grid high-frequency adjusting mechanism is further arranged on the inner fixing block, the lower end of the grid high-frequency adjusting mechanism is connected with two rows of hinged strips, each row of hinged strips corresponds to the first airflow grid and the second airflow grid, the lower end of each row of hinged strips is hinged to the grids of the first airflow grid and the second airflow grid, and the grids on the first airflow grid and the second airflow grid are hinged to the hinged shafts independently.
Further, as a preferred mode, the hinge strips are arranged in a telescopic adjusting mode, so that the condition of the air flow sprayed out of the first air flow grille and the second air flow grille can be adjusted, and the control air flow is sprayed out of the signal processing board irregularly in the experiment process.
Further, preferably, the grille high-frequency adjusting mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a high-frequency adjustable amplitude expansion piece and an intermediate connecting rod, wherein the upper ends of the second connecting rod and the third connecting rod are hinged together and are both hinged on the inner fixed block, the lower end of the second connecting rod is hinged with the upper end of the first connecting rod, the lower end of the third connecting rod is hinged with the upper end of the fourth connecting rod, the lower end of the first connecting rod and the lower end of the fourth connecting rod are hinged with each other and are both hinged on the driving block, the tops of the two rows of hinged strips are connected to the bottom side of the driving block, the hinged part between the third connecting rod and the fourth connecting rod is hinged with the high-frequency adjustable amplitude expansion piece, the output end of the high-frequency adjustable amplitude expansion piece is connected with the middle connecting rod, and the end part of the middle connecting rod is hinged to the hinged position between the first connecting rod and the second connecting rod.
Further, preferably, a sliding block is arranged on the side wall of the driving block, a vertical sliding groove is formed in the side connecting frame, and the sliding block is in sliding fit with the vertical sliding groove.
Further, as preferred, the outer cover body include the cuboid section and with the cuboid section is connected the combination section as an organic whole, be provided with the cuboid cavity in the cuboid section, be provided with the trapezoidal body cavity and the cuboid cavity of intercommunication each other in the combination section, the cuboid cavity of cuboid section with the trapezoidal body cavity intercommunication, internal fixation piece, side link, elastic cover piece, first airflow grid, second airflow grid, grid high frequency adjustment mechanism are located the cuboid cavity of cuboid section, the trapezoidal body cavity and the cuboid cavity of combination section.
The invention has the following advantages: compared with the same type of equipment, the low-temperature damp-heat vibration comprehensive experiment box of the multifunctional signal processing board provided by the invention has the following advantages:
(1) according to the low-temperature damp-heat vibration comprehensive experiment box for the multifunctional signal processing board, a temperature and humidity control air pump unit controls the humidity and the temperature of air flow supplied by a temperature and humidity control air flow supply pipe, and air flow sprayed out by a temperature and humidity control air flow spraying mechanism can act on the signal processing board on a comprehensive vibration platform; the direction and the angle of the air flow sprayed by each temperature and humidity control air flow spraying mechanism can be independently controlled, so that the temperature and the humidity in the outer case shell and the acting force condition of the air flow on the signal processing board can be adjusted by controlling the condition of the air flow sprayed by each temperature and humidity control air flow spraying mechanism, the experiments under various stress, vibration and temperature and humidity can be realized, the experiment of the adaptability of the signal circuit board in various environments and even sudden change environments is improved, the real simulation of the signal circuit board on the actual use is improved, and the signal circuit board can be sufficiently tested before mass production;
(2) the lower end of the grid high-frequency adjusting mechanism is connected with two rows of hinged strips, each row of hinged strips corresponds to the first airflow grid and the second airflow grid, the lower end of each row of hinged strips is hinged to the grids of the first airflow grid and the second airflow grid, and the grids on the first airflow grid and the second airflow grid are hinged to the hinged shafts independently, so that the experimental capacity is effectively improved.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a schematic view of an exploded structure of the temperature and humidity control airflow ejection mechanism of the present invention;
fig. 4 is a schematic front view of the temperature and humidity control airflow ejection mechanism of the present invention.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 4, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box which comprises a fixed base 1, a transverse vibration mechanism 2, a transverse vibration platform 4, a longitudinal vibration mechanism 5, a comprehensive vibration platform 7, a temperature and humidity control airflow supply pipe 10, a temperature and humidity control airflow ejection mechanism 8 and an outer box shell 11, wherein the transverse vibration mechanism is arranged at the upper end of the fixed base, the transverse vibration platform is arranged at the top of the transverse vibration mechanism, the comprehensive vibration platform is supported and connected at the top of the transverse vibration platform by the longitudinal vibration mechanism, the outer box shell extending upwards is arranged on the fixed base 1, the transverse vibration mechanism 2, the transverse vibration platform 4, the longitudinal vibration mechanism 5 and the comprehensive vibration platform 7 in a surrounding manner, and the multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box is characterized in that a plurality of groups of temperature and humidity control airflow ejection mechanisms 8 are arranged on the periphery side array of the comprehensive vibration platform, the temperature and humidity control airflow spraying mechanism 8 is connected with the temperature and humidity control airflow supply pipe 10, the temperature and humidity control airflow supply pipe 10 is connected with a temperature and humidity control air pump unit, so that the temperature and humidity of the airflow supplied by the temperature and humidity control airflow supply pipe 10 are controlled by the temperature and humidity control air pump unit, and the sprayed airflow of the temperature and humidity control airflow spraying mechanism 8 can act on a signal processing board on the comprehensive vibration platform 7; the direction and the angle of the air flow sprayed by each temperature and humidity control air flow spraying mechanism 8 can be independently controlled, so that the temperature and humidity in the outer box shell and the acting force condition of the air flow on the signal processing board can be adjusted by controlling the condition of the air flow sprayed by each temperature and humidity control air flow spraying mechanism 8.
Fixing base's bottom adopts rag bolt to fix in relevant position, transverse vibration mechanism 2 includes transverse vibration slider 2 and transverse vibration driver 3, the bottom slidable of transverse vibration slider cooperate in fixing base is last, the top at the transverse vibration slider is fixed to the transverse vibration platform, one side of transverse vibration slider is connected the output of transverse vibration driver, the transverse vibration driver is fixed fixing base is last, the setting that the vibration amplitude, the vibration frequency of transverse vibration driver are all adjustable.
The vertical vibration mechanism 5 is a vertical vibration driver, the vibration amplitude and the vibration frequency of the vertical vibration driver in the vertical direction are adjustable, the top of the vertical vibration mechanism is hinged with the middle of the bottom of the comprehensive vibration platform, and two auxiliary vibration drivers 6 are hinged between the periphery of the top of the transverse vibration platform 4 and the periphery of the bottom of the comprehensive vibration platform.
At least one of the auxiliary vibration drivers 6 is provided with a telescopic auxiliary mechanism at the upper end or the lower end so as to provide a vibration moving space for the longitudinal vibration mechanism and the auxiliary vibration driver, and the vibration amplitude and the vibration frequency of the auxiliary vibration driver 6 are both adjustable.
The comprehensive vibration platform is provided with a plurality of positioning pins 9 and fixing pins, and the positioning pins and the fixing pins are used for fixing and locking the signal processing board to be tested.
The temperature and humidity control air flow spraying mechanism 8 comprises an outer cover body, an inner fixing block 19, a side connecting frame 29, an elastic cover sheet 30, a first air flow grid 13, a second air flow grid 12 and a grid high-frequency adjusting mechanism, wherein a through hole 23 is formed in the outer cover body, the end part of the temperature and humidity control air flow supply pipe 10 penetrates through the through hole, the inner fixing block is fixedly arranged on the inner side of the outer cover body, the side connecting frames which are arranged at relative intervals are arranged on the two sides of the inner fixing block, the elastic cover sheet is arranged between the end parts of the two side connecting frames, the first air flow grid 13 and the second air flow grid 12 which are hinged on a hinging shaft 27 on the side connecting frames are arranged in a space surrounded by the elastic cover sheet and the side connecting frames, the first air flow grid 13 and the second air flow grid 12 are symmetrically arranged at intervals side by side, and the grid high-frequency adjusting mechanism is further arranged, the lower end of the grid high-frequency adjusting mechanism is connected with two rows of hinged strips, each row of hinged strips corresponds to the first airflow grid 13 and the second airflow grid 12, the lower end of each row of hinged strips is hinged to the grids 28 of the first airflow grid 13 and the second airflow grid 12, and the grids 28 on the first airflow grid 13 and the second airflow grid 12 are hinged to the hinged shaft 27 independently.
The hinged strips are arranged in a telescopic and adjustable mode so as to adjust the condition of the air flow sprayed out of the first air flow grille 13 and the second air flow grille 12, and the control air flow is sprayed out of the signal processing board irregularly in the experimental process.
The high-frequency grid adjusting mechanism comprises a first connecting rod 14, a second connecting rod 17, a third connecting rod 25, a fourth connecting rod 26, a high-frequency adjustable amplitude expansion piece 21 and an intermediate connecting rod 15, wherein the upper ends of the second connecting rod 17 and the third connecting rod 25 are hinged together and are hinged on the inner fixed block, the lower end of the second connecting rod is hinged with the upper end of the first connecting rod, the lower end of the third connecting rod is hinged with the upper end of the fourth connecting rod, the lower end of the first connecting rod and the lower end of the fourth connecting rod are hinged with each other and are both hinged on the driving block, the tops of the two rows of hinged strips are connected to the bottom side of the driving block, the hinged part between the third connecting rod 25 and the fourth connecting rod 26 is hinged with the high-frequency adjustable amplitude expansion piece 21, the output end of the high-frequency adjustable amplitude expansion piece 21 is connected with the middle connecting rod, and the end part of the middle connecting rod is hinged to the hinged position between the first connecting rod and the second connecting rod.
The lateral wall of the driving block is provided with a sliding block 20, the side connecting frame is provided with a vertical sliding groove 31, and the sliding block is in sliding fit with the vertical sliding groove.
The outer cover body includes cuboid section 24 and with the cuboid section is connected the combination section as an organic whole, be provided with the cuboid cavity in the cuboid section, be provided with the trapezoidal body cavity and the cuboid cavity of intercommunication each other in the combination section, the cuboid cavity of cuboid section with the trapezoidal body cavity intercommunication, interior fixed block 19, side link 29, elastic cover piece 30, first airflow grid 13, second airflow grid 12, grid high frequency adjustment mechanism are located the cuboid cavity of cuboid section the trapezoidal body cavity and the cuboid cavity of combination section.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described, and the standard parts used in the present invention are all available on the market, the special-shaped parts can be customized according to the description and the accompanying drawings, the specific connection mode of each part adopts the conventional means of bolt and rivet, welding and the like mature in the prior art, the machinery, parts and equipment adopt the conventional type in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, and the details are not described herein.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box comprises a fixed base (1), a transverse vibration mechanism (2), a transverse vibration platform (4), a longitudinal vibration mechanism (5), a comprehensive vibration platform (7), a temperature and humidity control air flow supply pipe (10), a temperature and humidity control air flow spraying mechanism (8) and an outer case (11), wherein the transverse vibration mechanism is arranged at the upper end of the fixed base, the transverse vibration platform is arranged at the top of the transverse vibration mechanism, the comprehensive vibration platform is arranged at the top of the transverse vibration platform in a supporting and connecting mode through the longitudinal vibration mechanism, the outer case extending upwards is arranged on the fixed base (1), the transverse vibration mechanism (2), the transverse vibration platform (4), the longitudinal vibration mechanism (5) and the comprehensive vibration platform (7) in an enclosing mode, the comprehensive vibration platform is characterized in that a plurality of temperature and humidity control air flow spraying mechanisms (8) are arranged on the periphery of the comprehensive vibration platform in an array mode, the temperature and humidity control air flow spraying mechanisms (8) are connected with temperature and humidity control air flow supply pipes (10), the temperature and humidity control air flow supply pipes (10) are connected with a temperature and humidity control air pump unit, so that the temperature and humidity control air flow supply pipes (10) control the humidity and temperature of air flow supplied by the temperature and humidity control air pump unit, and the air flow sprayed by the temperature and humidity control air flow spraying mechanisms (8) can act on a signal processing board on the comprehensive vibration platform (7); the direction and the angle of the air flow sprayed by each temperature and humidity control air flow spraying mechanism (8) can be independently controlled, so that the temperature and humidity in the outer box shell and the acting force condition of the air flow on the signal processing board can be adjusted by controlling the condition of the sprayed air flow of each temperature and humidity control air flow spraying mechanism (8).
2. The comprehensive experimental box of low-temperature damp-heat vibration of the multifunctional signal processing board as claimed in claim 1, characterized in that: fixing base's bottom adopts rag bolt to fix in relevant position, transverse vibration mechanism (2) are including transverse vibration slider (2) and transverse vibration driver (3), the bottom slidable of transverse vibration slider cooperate in on the fixing base, the top at the transverse vibration slider is fixed to the transverse vibration platform, one side of transverse vibration slider is connected the output of transverse vibration driver, the transverse vibration driver is fixed on the fixing base, the setting that the vibration amplitude, the vibration frequency of transverse vibration driver are all adjustable.
3. The comprehensive experimental box of low-temperature damp-heat vibration of the multifunctional signal processing board as claimed in claim 2, characterized in that: the vertical vibration mechanism (5) is a vertical vibration driver, the vibration amplitude and the vibration frequency of the vertical vibration driver in the vertical direction are adjustable, the top of the vertical vibration mechanism is hinged with the middle of the bottom of the comprehensive vibration platform, and the top of the transverse vibration platform (4) is hinged with two auxiliary vibration drivers (6) around and between the bottom of the comprehensive vibration platform.
4. The multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box of claim 3, which is characterized in that: at least one of the auxiliary vibration drivers (6) is provided with a telescopic auxiliary mechanism at the upper end or the lower end so as to provide a vibration moving space for the longitudinal vibration mechanism and the auxiliary vibration drivers, and the vibration amplitude and the vibration frequency of the auxiliary vibration drivers (6) are adjustable.
5. The comprehensive experimental box of low-temperature damp-heat vibration of the multifunctional signal processing board as claimed in claim 2, characterized in that: the comprehensive vibration platform is provided with a plurality of positioning pins (9) and fixing pins, and the positioning pins and the fixing pins are used for fixing and locking the signal processing board to be tested.
6. The multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box of claim 5, which is characterized in that: temperature humidity control air current blowout mechanism (8) are including the dustcoat body, interior fixed block (19), side link (29), elasticity cover piece (30), first air current grid (13), second air current grid (12), grid high frequency adjustment mechanism, wherein, be provided with through-hole (23) on the dustcoat body, the tip of temperature humidity control air current supply pipe (10) passes the through-hole setting, the dustcoat body inboard is fixed to be provided with interior fixed block, the both sides of interior fixed block are provided with relative interval arrangement the side link, two be provided with between the tip of side link elasticity cover piece, side link enclose be provided with in the space of establishing articulate in articulated shaft (27) on the side link first air current grid (13) and second air current grid (12), first air current grid (13), The second airflow grids (12) are symmetrically arranged side by side at intervals, the grid high-frequency adjusting mechanism is further arranged on the inner fixing block, the lower end of the grid high-frequency adjusting mechanism is connected with two rows of hinged strips, each row of hinged strips corresponds to the first airflow grids (13) and the second airflow grids (12), the lower ends of each row of hinged strips are hinged to the grids (28) of the first airflow grids (13) and the second airflow grids (12), and the grids (28) on the first airflow grids (13) and the second airflow grids (12) are hinged to the hinged shafts (27) in an independent mode.
7. The multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box of claim 5, which is characterized in that: the hinged strips are arranged in a telescopic and adjustable mode so as to adjust the conditions of the air flow sprayed out of the first air flow grille (13) and the second air flow grille (12) and control the air flow to be sprayed out of the signal processing board irregularly in the experimental process.
8. The multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box of claim 6, which is characterized in that: the high-frequency grid adjusting mechanism comprises a first connecting rod (14), a second connecting rod (17), a third connecting rod (25), a fourth connecting rod (26), a high-frequency adjustable amplitude expansion piece (21) and a middle connecting rod (15), wherein the upper ends of the second connecting rod (17) and the third connecting rod (25) are hinged together and are hinged on the inner fixed block, the lower end of the second connecting rod is hinged with the upper end of the first connecting rod, the lower end of the third connecting rod is hinged with the upper end of the fourth connecting rod, the lower ends of the first connecting rod and the fourth connecting rod are hinged with each other and are hinged on the driving block, the tops of the two rows of hinged strips are connected to the bottom side of the driving block, the high-frequency adjustable amplitude expansion piece (21) is hinged at the hinged part between the third connecting rod (25) and the fourth connecting rod (26), and the output end of the high-frequency adjustable amplitude expansion piece (21) is connected with the middle connecting rod, the end part of the middle connecting rod is hinged at the hinged part between the first connecting rod and the second connecting rod.
9. The multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box of claim 5, which is characterized in that: the side wall of the driving block is provided with a sliding block (20), the side connecting frame is provided with a vertical sliding groove (31), and the sliding block is in sliding fit with the vertical sliding groove.
10. The multifunctional signal processing board low-temperature damp-heat vibration comprehensive experiment box of claim 9, which is characterized in that: the outer cover body include cuboid section (24) and with the cuboid section is connected the combination section as an organic whole, be provided with rectangular body cavity in the cuboid section, be provided with the trapezoidal body cavity and the rectangular body cavity of intercommunication each other in the combination section, the rectangular body cavity of cuboid section with trapezoidal body cavity intercommunication, interior fixed block (19), side link (29), elastic cover piece (30), first air grid (13), second air grid (12), grid high frequency adjustment mechanism are located the rectangular body cavity of cuboid section trapezoidal body cavity and combination section's rectangular body cavity.
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