Air tightness testing device for box-type filter shell production

Abstract

The invention discloses an air tightness testing device for box type filter shell production, and relates to the technical field of box type filters, the air tightness testing device comprises a base and a box type filter shell, the top end of the base is fixedly connected with a pedestal, the top of the pedestal is provided with an electric telescopic rod, and the output end of the electric telescopic rod is fixedly connected with a top plate; the top end of the top plate is fixedly connected with an air inlet, an air pressure sensor is installed in the middle of the top end of the base, and a sealing structure is fixedly installed at the top of the top plate. According to the air tightness testing device for production of the box-type filter shell, through the effect of the sealing structure, the fixed air bag and the inflatable air bag are extruded at the two ends of the box-type filter shell, the two ventilated ends of the box-type filter shell can be sealed, and due to the good deformation capacity of the rubber air bag, the air tightness of the box-type filter shell is improved. And the end space of the box type filter shell can be well filled, so that a better sealing effect is provided, and the air tightness detection is prevented from being influenced by a gap at the end.

Description

Technical Field

[0001] The invention relates to the technical field of box-type filters, and in particular to an airtightness testing device for producing box-type filter housings. Background Art

[0002] A box filter is a filtering device with a square or rectangular housing, which is equipped with a replaceable filter element or filter material. Its function is to remove solid particles, impurities, moisture or other contaminants in the fluid through physical interception and adsorption, so as to purify the fluid, protect downstream equipment or meet process requirements. It is widely used in HVAC systems, industrial manufacturing, clean rooms, compressed air systems, water treatment and laboratories, and other fields that require fluid purification. The air tightness test device used in the production of box filter housings is a special equipment used to detect whether there are leaks in the welds, sealing surfaces and overall structure of the filter housing (box).

[0003] The air tightness testing device for the production of box-type filter housings in the prior art mainly includes a base, a box-type filter housing, a pedestal, a top plate, an air inlet and an air pressure sensor. When in use, the box-type filter housing is placed outside the air pressure sensor, and the electric telescopic rod on the base is used to press down the top plate, and cooperate with the base to tighten the ventilation ends of the box-type filter housing. Then, the air inlet is connected to an air pump and other equipment, and air is pumped into the box-type filter housing. The air tightness of the box-type filter housing is then tested based on the data transmitted by the air pressure sensor. If the value of the air pressure sensor remains stable for a certain period of time after the pumping is completed, the air tightness of the box-type filter housing is good. On the contrary, if the value of the air pressure sensor fluctuates, the air tightness of the box filter housing is poor. However, in actual use, the extrusion of the box filter housing by the pressure plate and the base cannot guarantee a good sealing effect. The welding process or special requirements of some box filter housings will cause bulges on the edge of the box filter housing, which will cause air leakage at the end of the box filter housing when the box filter housing is tested for air tightness, thereby seriously affecting the accuracy of the air tightness test. At the same time, the hard extrusion between the top plate and the base can easily cause the box filter housing to deform, which may cause damage to the box filter housing and other problems.

[0004] Therefore, in response to the above problems, an airtightness testing device for producing a box-type filter housing is proposed. Summary of the Invention

[0005] In order to make up for the shortcomings of the existing technology, the extrusion of the box filter housing by the pressure plate and the base cannot guarantee a good sealing effect. The welding process or special requirements of some box filter housings will cause bulges on the edge of the box filter housing, which will lead to air leakage at the end of the box filter housing when the box filter housing is tested for air tightness, thereby seriously affecting the accuracy of the air tightness test. At the same time, the hard extrusion between the top plate and the base can easily cause the box filter housing to deform, which may cause damage to the box filter housing and other problems. A box filter housing air tightness testing device is proposed for production.

[0006] The technical solution adopted by the present invention to solve its technical problems is: an air tightness testing device for the production of box-type filter housings, comprising a base and a box-type filter housing, the top of the base is fixedly connected to the base, the top of the base is installed with an electric telescopic rod, the output end of the electric telescopic rod is fixedly connected to the top plate, the top of the top plate is fixedly connected to the air inlet, an air pressure sensor is installed in the middle of the top of the base, a sealing structure is fixedly installed on the top of the top plate, a positioning structure and a detection structure are fixedly installed on the top of the base, the sealing structure comprises a plurality of elastic telescopic rods fixedly installed on the bottom end of the top plate, the bottom end of the elastic telescopic rod is fixedly connected to a pressure plate, the bottom end of the pressure plate is fixedly connected to a fixed airbag, and the air inlet passes through the bottom end of the pressure plate.

[0007] Preferably, an annular groove is provided at the top of the base, and an inflatable airbag is fixedly connected to the inside of the annular groove. The inflatable airbag and the fixed airbag are both made of rubber. The annular groove is located outside the sensor, and the edge of the box-type filter housing is aligned with the opposite surfaces of the fixed airbag and the inflatable airbag.

[0008] Preferably, the top of the base is fixedly connected to a rectangular box, an air chamber 1 is opened inside the rectangular box, the bottom end of the top plate is fixedly connected to a bottom plate, the bottom end of the bottom plate is fixedly connected to a piston block 1, the outer wall of the piston block 1 is plugged into the inner wall of the air chamber 1, and the bottom end of the air chamber 1 is fixedly connected to an air pipe 1 that passes through the air chamber 1 and the inflatable airbag.

[0009] Preferably, the positioning structure includes a bracket fixedly connected to the top of the base, the bottom of the bracket is fixedly connected to an air cylinder 1, an air storage tank 2 is opened inside the rectangular box, the bottom end of the bottom plate is fixedly connected to a piston block 2, the outer wall of the piston block 2 is plugged into the inner wall of the air storage tank 2, one end of the air cylinder is fixedly connected to an air pipe 2 that passes through the air cylinder 1 and the air storage tank 2, the outer wall of the air cylinder is fixedly connected to a cylinder 1 that passes through the air cylinder, the inner wall of the cylinder 1 is slidably connected to a piston rod 1, the end of the piston rod 1 that passes through the cylinder 1 is fixedly connected to a round box, the middle part of the round box is rotatably connected to a rotating rod, the bottom end of the rotating rod is fixedly connected to an angle plate, and the bottom end of the angle plate is fixedly connected to two rubber wheels.

[0010] Preferably, a coil spring is fixedly connected to the inner wall of the round box, and one end of the coil spring close to the axis of the round box is fixedly connected to the outer wall of the rotating rod.

[0011] Preferably, the outer wall of the piston rod 1 is provided with a spring 1, and the two ends of the spring 1 are respectively fixedly connected to one end of the piston rod 1 and one side of the inner wall of the cylinder 1. A connecting groove is opened in the middle of the piston block 2, and the size and shape of the notch at the bottom of the connecting groove are adapted to the size and shape of the inner wall of the trachea 2.

[0012] Preferably, a connecting pipe is fixedly connected to the outer wall of the second air pipe, and a one-way valve is fixedly installed on the outer wall of the connecting pipe.

[0013] Preferably, the detection structure includes an air cylinder 2 fixedly connected to the top of the bracket, one end of the air cylinder 2 is fixedly connected to an air pipe 3 passing through the air cylinder 2 and the air tank 2, the size and shape of the inner wall of the air pipe 3 are adapted to the size and shape of the notch at the top of the connecting groove, the outer wall of the air cylinder 2 is fixedly connected to the cylinder 2, the inner wall of the cylinder 2 is slidably connected to the piston rod 2, and one end of the piston rod 2 passing through the cylinder 2 is fixedly connected to a card frame.

[0014] Preferably, a plurality of lightweight tassels are fixedly connected to the bottom end of the card frame, and the distribution of the lightweight tassels matches the shape of the outer surface of the box-type filter housing.

[0015] Preferably, a spring 2 is sleeved on the outside of the second piston rod, and both ends of the second spring are fixedly connected to one end of the second piston rod and one side of the inner wall of the second cylinder respectively.

[0016] Due to the adoption of the above technical solution, the present invention has the following technical advancements compared to the prior art: 1. The present invention provides an air tightness testing device for the production of box-type filter housings. Through the effect of the sealing structure, a fixed airbag and an inflatable airbag are squeezed at both ends of the box-type filter housing to seal the ventilation ends of the box-type filter housing. The good deformation ability of the rubber airbag can well fill the end space of the box-type filter housing, thereby providing a better sealing effect and avoiding the gap at the end affecting the air tightness detection.

[0017] 2. The present invention provides an air tightness testing device for the production of box-type filter housings. Through the function of the positioning structure, eight rubber wheels are divided into four groups and clamped at the four corners of the box-type filter housing to position the four corners of the box-type filter housing, thereby ensuring that the edge of the box-type filter housing can face the fixed airbag and the inflatable airbag, thereby ensuring the sealing effect of the end face of the box-type filter housing.

[0018] 3. The present invention provides an air tightness testing device for the production of box-type filter housings. Through the function of the detection structure, when the air tightness of the box-type filter housing is poor, the gas is ejected outward through the leakage hole of the box-type filter housing, thereby causing the tassels at the corresponding position to float up, thereby assisting the tester to quickly find the leakage point of the box-type filter housing, thereby facilitating the subsequent maintenance of the box-type filter housing and improving the processing efficiency of the box-type filter housing.

[0019] 4. The present invention provides an air tightness testing device for the production of box-type filter housings. Through the action of piston block 1 and piston block 2 on air chamber 1 and air chamber 2, the sealing structure, positioning structure and detection structure can be pressed down along with the top plate, that is, the testing operation of the device body is synchronized, thereby improving the smoothness of the device operation, while reducing the device processing cost and working energy consumption. Moreover, under the action of spring 1 and spring 2, the positioning structure and the detection structure can be driven to be reset synchronously during the process of resetting the device body, thereby further improving the practical effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 This is a schematic structural diagram of the elastic telescopic rod of the present invention; Figure 4 It is a schematic diagram of the rectangular box structure of the present invention; Figure 5 Schematic diagram of the cross-sectional structure of a rectangular box of the present invention; Figure 6 It is a structural schematic diagram of the positioning structure of the present invention; Figure 7 It is a structural schematic diagram of the detection structure of the present invention; Figure 8 For the present invention Figure 6 A in the enlarged view.

[0021] Figure: 1, base; 2, box filter housing; 3, base; 4, top plate; 5, air inlet; 6, air pressure sensor; 7, sealing structure; 71, elastic telescopic rod; 72, pressure plate; 73, fixed airbag; 74, annular groove; 75, inflatable airbag; 76, rectangular box; 77, bottom plate; 78, piston block 1; 79, air chamber 1; 710, air pipe 1; 8, positioning structure; 81, air pipe 2; 82, air Cylinder one; 83. Piston rod one; 84. Round box; 85. Rotating rod; 86. Angle plate; 87. Rubber wheel; 88. Coil spring; 89. Spring one; 810. Connecting pipe; 811. One-way valve; 812. Air chamber two; 813. Piston block two; 814. Connecting groove; 9. Detection structure; 91. Air pipe three; 92. Air cylinder two; 93. Piston rod two; 94. Card frame; 95. Lightweight tassel; 96. Spring two. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Specific examples are given below.

[0024] See also Figure 1 - Figure 8 The present invention provides a technical solution: an air tightness test device for the production of a box-type filter housing, comprising a base 1 and a box-type filter housing 2, the top of the base 1 is fixedly connected to a base 3, the top of the base 3 is installed with an electric telescopic rod, the output end of the electric telescopic rod is fixedly connected to a top plate 4, the top of the top plate 4 is fixedly connected to an air inlet 5, an air pressure sensor 6 is installed in the middle of the top of the base 1, a sealing structure 7 is fixedly installed on the top of the top plate 4, a positioning structure 8 and a detection structure 9 are fixedly installed on the top of the base 1, and the sealing structure 7 includes several The elastic telescopic rod 71 is fixedly installed at the bottom end of the top plate 4, and the bottom end of the elastic telescopic rod 71 is fixedly connected to the pressure plate 72, and the bottom end of the pressure plate 72 is fixedly connected to the fixed airbag 73. The air inlet 5 passes through the bottom end of the pressure plate 72. The elastic telescopic rod 71 can avoid direct hard contact between the pressure plate 72 and the box-type filter housing 2, thereby avoiding excessive extrusion between the pressure plate 72, the box-type filter housing 2 and the base 1, and thus causing deformation of the box-type filter housing 2, while avoiding damage to the fixed airbag 73 and the inflatable airbag 75 caused by excessive pressure.

[0025] like Figure 3 and Figure 4 As shown, an annular groove 74 is provided at the top of the base 1, and an inflatable airbag 75 is fixedly connected to the inside of the annular groove 74. The inflatable airbag 75 and the fixed airbag 73 are both made of rubber. The annular groove 74 is located outside the sensor, and the edge of the box-type filter housing 2 is aligned with the opposite surfaces of the fixed airbag 73 and the inflatable airbag 75. The fixed airbag 73 and the inflatable airbag 75 are squeezed at the two ends of the box-type filter housing 2, which can seal the two ends of the ventilation of the box-type filter housing 2. The good deformation ability of the rubber airbag can well fill the end space of the box-type filter housing 2, thereby providing a better sealing effect and avoiding the gap at the end affecting the air tightness detection.

[0026] like Figure 5 As shown, the top of the base 1 is fixedly connected to a rectangular box 76, and an air chamber 79 is opened inside the rectangular box 76. The bottom end of the top plate 4 is fixedly connected to a bottom plate 77, and the bottom end of the bottom plate 77 is fixedly connected to a piston block 78. The outer wall of the piston block 78 is plugged into the inner wall of the air chamber 79, and the bottom end of the air chamber 79 is fixedly connected to an air pipe 710 that passes through the air chamber 79 and the inflatable airbag 75. During the downward movement of the top plate 4, the top plate 4 drives the bottom plate 77 to slide down synchronously, and then drives the piston block 78 to insert into the air chamber 79 of the rectangular box 76, and then the gas inside the air chamber 79 can be squeezed into the inflatable airbag 75 through the degassing pipe 710, and then the inflatable airbag 75 can be inflated.

[0027] like Figure 6As shown, the positioning structure 8 includes a bracket fixedly connected to the top of the base 1, the bottom of the bracket is fixedly connected to an air cylinder 1 82, an air chamber 2 812 is opened inside the rectangular box 76, and the bottom end of the bottom plate 77 is fixedly connected to a piston block 2 813. The outer wall of the piston block 2 813 is plugged into the inner wall of the air chamber 2 812. One end of the air cylinder is fixedly connected to an air pipe 2 81 that passes through the air cylinder 1 82 and the air chamber 2 812. The outer wall of the air cylinder is fixedly connected to a cylinder 1 that passes through the air cylinder, and the inner wall of the cylinder 1 is slidably connected to a piston rod 1 83. One end of the piston rod 1 83 that passes through the cylinder 1 is fixedly connected to a round box 84. The middle part of the round box 84 is rotatably connected to a rotating rod 85. The bottom end of the rotating rod 85 is fixedly connected to an angle plate 86. The bottom end of the angle plate 86 is fixedly connected to two rubber wheels 87. During the process, the piston block 2 813 is gradually inserted into the air chamber 2 812, thereby causing the air pressure inside the air chamber 2 812 to gradually increase. Then, under the action of the air pressure, the piston rod 1 83 overcomes the force of the spring 1 89 and slides outward, thereby causing the angle plate 86 to slide toward the box filter housing 2. After a rubber wheel 87 contacts and squeezes one side of the box filter housing 2, the angle plate 86 deflects, thereby causing another rubber wheel 87 to fit against the other adjacent side of the box filter housing 2. The four angle plates 86 and their related rubber wheels 87 work together to position the four corners of the box filter housing 2, thereby ensuring that the edge of the box filter housing 2 can face the fixed airbag 73 and the inflatable airbag 75, thereby ensuring the sealing effect of the end face of the box filter housing 2.

[0028] like Figure 8 As shown, the inner wall of the round box 84 is fixedly connected with a coil spring 88, and one end of the coil spring 88 close to the axis of the round box 84 is fixedly connected to the outer wall of the rotating rod 85. During the resetting process, the coil spring 88 drives the angle plate 86 to deflect, thereby causing the two rubber wheels 87 to return to their position and remain parallel to one side of the box filter housing 2, thereby ensuring the accurate diagonal positioning effect of the box filter housing 2 next time.

[0029] like Figure 5 and Figure 6As shown, the outer wall of the piston rod 83 is sleeved with a spring 89, and the two ends of the spring 89 are fixedly connected to one end of the piston rod 83 and one side of the inner wall of the cylinder 1 respectively. A connecting groove 814 is provided in the middle of the piston block 2 813. The size and shape of the notch at the bottom of the connecting groove 814 are adapted to the size and shape of the inner wall of the trachea 2 81. After the positioning is completed, the piston block 2 813 just slides to the bottom of the air chamber 2 812. At this time, the notch at the bottom of the connecting groove 814 is aligned with the trachea 2 81. Under the pressure difference and the reaction force of the spring 1 89, the gas inside the air cylinder 1 82 and the cylinder 1 flows to the inside of the air cylinder 2 92 through the connecting groove 814. At this time, the piston rod 1 83, the angle plate 86 and the rubber wheel 87 slide to reset, so as to prevent the rubber wheel 87 and other components from affecting the detection effect of the lightweight tassel 95.

[0030] like Figure 6 As shown, the outer wall of the air pipe 81 is fixedly connected to the connecting pipe 810, and the outer wall of the connecting pipe 810 is fixedly installed with a one-way valve 811. When the top plate 4 slides up and then drives the piston block 813 to reset, the one-way valve 811 opens, and the outside air flows into the inside of the air tank 812 through the connecting pipe 810 and the one-way valve 811, thereby balancing the air pressure and avoiding the formation of negative pressure at the bottom of the air tank 812 during the sliding of the piston block 813, which makes it difficult to pull out.

[0031] like Figure 7 As shown, the detection structure 9 includes an air cylinder 2 92 fixedly connected to the top of the bracket, and one end of the air cylinder 2 92 is fixedly connected to an air pipe 3 91 passing through the air cylinder 2 92 and the air warehouse 2 812, and the size and shape of the inner wall of the air pipe 3 91 are adapted to the size and shape of the notch at the top of the connecting groove 814, and the outer wall of the air cylinder 2 92 is fixedly connected to the cylinder 2, and the inner wall of the cylinder 2 is slidably connected to the piston rod 2 93, and one end of the piston rod 2 93 passing through the cylinder 2 is fixedly connected to the clamping frame 94. After the gas flows into the inside of the air cylinder 2 through the connecting groove 814 and the air pipe 3 91, under the action of air pressure, the piston rod pushes the push rod to move toward the clamping frame 94 to the outside of the box filter housing 2, and ensures that it fits with the outer wall of the box filter housing 2, thereby ensuring the detection effect of the lightweight tassel 95.

[0032] like Figure 7 As shown, a number of lightweight tassels 95 are fixedly connected to the bottom end of the card frame 94. The distribution of the lightweight tassels 95 is consistent with the outer surface shape of the box-type filter housing 2. When the air tightness of the box-type filter housing 2 is poor, the gas will be ejected outward through the leakage hole of the box-type filter housing 2, which can cause the tassels at the corresponding position to float up, thereby assisting the tester to quickly find the leakage point of the box-type filter housing 2, thereby facilitating the subsequent maintenance of the box-type filter housing 2 and improving the processing efficiency of the box-type filter housing 2.

[0033] like Figure 7 As shown, the outer sleeve of the piston rod 2 93 is provided with a spring 2 96, and the two ends of the spring 2 96 are fixedly connected to one end of the piston rod 2 93 and one side of the inner wall of the cylinder 2 respectively. After the subsequent electric telescopic rod drives the top plate 4 to slide up, thereby causing the piston block 2 813 to disengage from the air chamber 2 812, the push rod and the lightweight tassel 95 are reset under the action of the spring 2 96, thereby avoiding the problem that the card frame 94 affects the normal loading of the box filter housing 2.

[0034] It should be noted that the stiffness coefficient of spring 2 96 is lower than that of spring 1 89, and the deformation of spring 2 96 under unit load is smaller. Therefore, when air cylinder 1 82, connecting groove 814 and air cylinder 2 92 are connected, spring 1 89 can drive piston rod 1 83 to reset, while spring 2 96 is compressed, causing piston rod 2 93 to slide outward. The working principle of the present invention is as follows: when in use, the box filter housing 2 is placed on the base 1, and its edge is roughly above the inflatable airbag 75, and then the electric telescopic rod on the base 3 is used to press down the top plate 4. In the process of the top plate 4 pressing down the box filter housing 2, the elastic telescopic rod 71 can prevent the pressing plate 72 from directly and rigidly contacting the box filter housing 2, thereby avoiding excessive squeezing between the pressing plate 72, the box filter housing 2 and the base 1, and thus causing deformation of the box filter housing 2, while avoiding damage caused by excessive pressure on the fixed airbag 73 and the inflatable airbag 75. In the process of the top plate 4 sliding down, , the top plate 4 drives the bottom plate 77 to slide down synchronously, and then drives the piston block 78 to insert into the air chamber 79 of the rectangular box 76, and then the gas inside the air chamber 79 can be squeezed into the inflatable airbag 75 through the degassing pipe 710, and then the inflatable airbag 75 can be inflated. At this time, the fixed airbag 73 and the inflatable airbag 75 are squeezed at the two ends of the box-type filter housing 2, and the two ends of the ventilation of the box-type filter housing 2 can be sealed. The good deformation ability of the rubber airbag can well fill the end space of the box-type filter housing 2, thereby providing a better sealing effect and avoiding the gap at the end affecting the air tightness test; As the bottom plate 77 slides down, the second piston block 813 gradually inserts into the second air chamber 812, thereby causing the air pressure inside the second air chamber 812 to gradually increase. Thereafter, under the action of the air pressure, the first piston rod 83 overcomes the force of the first spring 89 and slides outward, thereby causing the angle plate 86 to slide toward the box filter housing 2. After one rubber wheel 87 contacts and squeezes one side of the box filter housing 2, the angle plate 86 deflects, thereby causing the other rubber wheel 87 to fit against the other adjacent side of the box filter housing 2. The four angle plates 86 and their related rubber wheels 87 work together to position the four corners of the box filter housing 2, thereby ensuring that the edge of the box filter housing 2 can face the fixed airbag 73 and the inflatable airbag 75, thereby ensuring the sealing effect of the end face of the box filter housing 2. After the positioning is completed, the second piston block 813 just slides to the bottom of the second air chamber 812 At this time, the notch at the bottom of the connecting groove 814 is aligned with the air pipe 81. Under the pressure difference and the reaction force of the spring 89, the gas inside the air cylinder 82 and the cylinder 1 flows into the interior of the air cylinder 92 through the connecting groove 814. At this time, the piston rod 83, the angle plate 86 and the rubber wheel 87 slide back. During the reset process, the coil spring 88 drives the angle plate 86 to deflect, thereby causing the two rubber wheels 87 to return to their original position and remain parallel to one side of the box filter housing 2, thereby ensuring the accurate diagonal positioning of the box filter housing 2 next time. In the subsequent sliding of the top plate 4, and then driving the piston block 813 to reset, the one-way valve 811 opens, and the outside air flows into the interior of the air chamber 812 through the connecting pipe 810 and the one-way valve 811, thereby balancing the air pressure and avoiding the formation of negative pressure at the bottom of the air chamber 812 during the sliding process of the piston block 813, which leads to the problem of difficulty in pulling out. After the gas passes through the connecting groove 814 and the air pipe three 91 and flows into the inside of the air cylinder two 92, under the action of air pressure, the piston rod pushes the push rod to move toward the card frame 94 to the outside of the box filter housing 2, and ensures that it fits with the outer wall of the box filter housing 2, thereby ensuring the detection effect of the lightweight tassel 95. At this time, the air inlet 5 is connected to the air pump and other equipment, and then air is pumped into the box filter housing 2. After that, the air tightness of the box filter housing 2 is tested according to the data transmitted by the air pressure sensor 6. If the value of the air pressure sensor 6 remains stable for a certain period of time after the pumping is completed, the air tightness of the box filter housing 2 is good. Otherwise, the value of the air pressure sensor 6 appears If the air tightness of the box filter housing 2 is poor, the gas will be ejected outward through the leakage hole of the box filter housing 2, which will cause the tassels at the corresponding position to float up, thereby assisting the tester to quickly find the leakage point of the box filter housing 2, thereby facilitating the subsequent maintenance of the box filter housing 2 and improving the processing efficiency of the box filter housing 2. After the electric telescopic rod drives the top plate 4 to slide up, thereby causing the piston block 2 813 to disengage from the air chamber 2 812, the push rod and the lightweight tassel 95 are reset under the action of the spring 2 96, thereby avoiding the problem of the card frame 94 affecting the normal loading of the box filter housing 2.

[0035] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An air tightness testing device for producing a box-type filter housing, comprising a base (1) and a box-type filter housing (2), characterized in that: The top of the base (1) is fixedly connected to the base (3), the top of the base (3) is equipped with an electric telescopic rod, the output end of the electric telescopic rod is fixedly connected to the top plate (4), the top of the top plate (4) is fixedly connected to the air inlet (5), the middle of the top of the base (1) is equipped with an air pressure sensor (6), the top of the top plate (4) is fixedly installed with a sealing structure (7), the top of the base (1) is fixedly installed with a positioning structure (8) and a detection structure (9), the sealing structure (7) includes a plurality of elastic telescopic rods (71) fixedly installed at the bottom end of the top plate (4), the bottom end of the elastic telescopic rod (71) is fixedly connected to a pressure plate (72), the bottom end of the pressure plate (72) is fixedly connected to a fixed airbag (73), and the air inlet (5) extends through the bottom end of the pressure plate (72).

2. The air tightness testing device for box-type filter housing production according to claim 1, characterized in that: An annular groove (74) is provided at the top of the base (1), and an inflatable airbag (75) is fixedly connected to the inside of the annular groove (74). The inflatable airbag (75) and the fixed airbag (73) are both made of rubber. The annular groove (74) is located outside the sensor, and the edge of the box-type filter housing (2) is aligned with the opposite surfaces of the fixed airbag (73) and the inflatable airbag (75).

3. The air tightness testing device for box-type filter housing production according to claim 2, characterized in that: The top end of the base (1) is fixedly connected to a rectangular box (76), an air chamber (79) is provided inside the rectangular box (76), the bottom end of the top plate (4) is fixedly connected to a bottom plate (77), the bottom end of the bottom plate (77) is fixedly connected to a piston block (78), the outer wall of the piston block (78) is plugged into the inner wall of the air chamber (79), and the bottom end of the air chamber (79) is fixedly connected to an air pipe (710) that passes through the air chamber (79) and the inflatable airbag (75).

4. The air tightness testing device for producing a box-type filter housing according to claim 3, characterized in that: The positioning structure (8) includes a bracket fixedly connected to the top of the base (1), the bottom of the bracket is fixedly connected to an air cylinder (82), an air chamber (812) is provided inside the rectangular box (76), the bottom end of the bottom plate (77) is fixedly connected to a piston block (813), the outer wall of the piston block (813) is plugged into the inner wall of the air chamber (812), one end of the air cylinder is fixedly connected to an air pipe (81) passing through the air cylinder (82) and the air chamber (812), the outer wall of the air cylinder is fixedly connected to a cylinder (8) passing through the air cylinder, the inner wall of the cylinder is slidably connected to a piston rod (83), one end of the piston rod (83) passing through the cylinder is fixedly connected to a round box (84), the middle part of the round box (84) is rotatably connected to a rotating rod (85), the bottom end of the rotating rod (85) is fixedly connected to an angle plate (86), and the bottom end of the angle plate (86) is fixedly connected to two rubber wheels (87).

5. The air tightness testing device for producing box-type filter housings according to claim 4, characterized in that: The inner wall of the round box (84) is fixedly connected to a coil spring (88), and one end of the coil spring (88) close to the axis of the round box (84) is fixedly connected to the outer wall of the rotating rod (85).

6. The air tightness testing device for producing box-type filter housings according to claim 4, characterized in that: The outer wall of the piston rod (83) is provided with a spring (89), and the two ends of the spring (89) are fixedly connected to one end of the piston rod (83) and one side of the inner wall of the cylinder (81), respectively. A connecting groove (814) is provided in the middle of the piston block (813), and the size and shape of the bottom notch of the connecting groove (814) are adapted to the size and shape of the inner wall of the trachea (81).

7. The air tightness testing device for producing box-type filter housings according to claim 4, characterized in that: The outer wall of the second air pipe (81) is fixedly connected to a connecting pipe (810), and the outer wall of the connecting pipe (810) is fixedly installed with a one-way valve (811).

8. The air tightness testing device for producing box-type filter housings according to claim 4, characterized in that: The detection structure (9) includes an air cylinder 2 (92) fixedly connected to the top of the bracket, one end of the air cylinder 2 (92) is fixedly connected to an air pipe 3 (91) that passes through the air cylinder 2 (92) and the air chamber 2 (812), the size and shape of the inner wall of the air pipe 3 (91) are adapted to the size and shape of the notch at the top of the connecting groove (814), the outer wall of the air cylinder 2 (92) is fixedly connected to the cylinder 2, the inner wall of the cylinder 2 is slidably connected to the piston rod 2 (93), and one end of the piston rod 2 (93) that passes through the cylinder 2 is fixedly connected to the card frame (94).

9. The air tightness testing device for producing box-type filter housings according to claim 8, characterized in that: A plurality of lightweight tassels (95) are fixedly connected to the bottom end of the card frame (94), and the distribution of the lightweight tassels (95) matches the shape of the outer surface of the box-type filter housing (2).

10. The air tightness testing device for producing box-type filter housings according to claim 8, characterized in that: The outer sleeve of the second piston rod (93) is provided with a second spring (96), and the two ends of the second spring (96) are fixedly connected to one end of the second piston rod (93) and one side of the inner wall of the second cylinder respectively.

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