Automobile engine sound insulation cotton testing device

Abstract

The present invention relates to the technical field of testing devices, and in particular to a testing device for automobile engine sound insulation cotton, comprising a base and a detection cavity, openings for feeding and discharging materials are respectively arranged on both sides of the detection cavity, a partition is arranged inside the detection cavity, and the partition divides the inside of the detection cavity into a relatively independent first cavity and a second cavity, a loudspeaker, a heating element and a first temperature sensor are installed inside the first cavity, a receiver and a second temperature sensor are installed inside the second cavity, guide mechanisms are arranged on the outsides of the two openings, a first rotating disk and a second rotating disk are respectively arranged on both sides of the top of the base, and a rotating driving mechanism for driving the first rotating disk and the second rotating disk to rotate synchronously is arranged at the bottom of the base, an inner support positioning mechanism fixed to the central reel of the sound insulation cotton is arranged at the center of the first rotating disk and the second rotating disk, and the sound insulation and heat insulation effects of the sound insulation cotton can be synchronously detected when the sound insulation cotton passes through the inside of the detection cavity, and the detection is more comprehensive and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of testing devices, in particular to a testing device for automobile engine sound insulation cotton. Background Art

[0002] The main function of engine sound insulation cotton is to effectively eliminate and reduce noises such as the roar of the engine, the vibration of the car body, and the friction of the wheels, thereby creating a quiet riding environment. When the engine is running, the friction of internal parts will generate noise, which is transmitted into the car through the hood. If the engine sound insulation cotton is installed, the porous cotton material can absorb most of the noise, and the noise transmitted into the car will be greatly reduced.

[0003] The sound insulation cotton is installed on the inside of the engine hood. It not only needs to have good sound insulation effect, but also good heat insulation performance to prevent the engine from directly bringing high temperature to the hood to protect the car's painted hood, while preventing the hood from fogging up and affecting the field of vision on rainy days. However, the existing car engine sound insulation cotton testing devices generally have a relatively single testing method, which can only test the sound insulation effect of the sound insulation cotton, but cannot simultaneously test the heat insulation performance of the sound insulation cotton. Summary of the invention

[0004] The purpose of the present invention is to provide a vehicle engine sound insulation cotton testing device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a car engine sound insulation cotton testing device, comprising a base and a detection cavity installed in the middle of the top of the base, openings for feeding and discharging materials are respectively arranged on both sides of the detection cavity, a partition is arranged inside the detection cavity, and the partition divides the inside of the detection cavity into a relatively independent first cavity and a second cavity, a loudspeaker, a heating element and a first temperature sensor are installed inside the first cavity, a receiver and a second temperature sensor are installed inside the second cavity, guide mechanisms are arranged on the outsides of the two openings, a first rotating disk and a second rotating disk are respectively arranged on both sides of the top of the base, and a rotating drive mechanism for driving the first rotating disk and the second rotating disk to rotate synchronously is arranged at the bottom of the base, and an internal support positioning mechanism fixed to the central reel of the sound insulation cotton is arranged at the center of the first rotating disk and the second rotating disk.

[0006] Furthermore, the rotary drive mechanism includes a first pulley fixed to the bottom ends of the first rotating disk and the second rotating disk through a rotating shaft, a second pulley rotatably installed inside the base, a motor driving the second pulley to rotate, and a transmission belt connecting the first pulley and the second pulley, and the first pulley is located inside the base.

[0007] Furthermore, the guide mechanism includes a first fixed frame and a second fixed frame symmetrically installed on both sides of the opening width, a first guide roller is rotatably installed inside the first fixed frame, a second guide roller is rotatably arranged inside the second fixed frame through an elastic support component, and the elastic support component is used to push the second guide roller to move toward a side close to the first guide roller.

[0008] Furthermore, the internal support positioning mechanism includes a fixed cylinder vertically fixed at the top of the first rotating disk or the second rotating disk and a plurality of positioning plates arranged in a circular array on the outside of the fixed cylinder with the fixed cylinder as the center, a plurality of first connecting rods horizontally slidingly connected to the fixed cylinder are fixed on the inner wall of the positioning plate along its length direction, a second connecting rod is vertically and movably arranged inside the fixed cylinder, an adjusting knob is rotatably arranged at the top of the fixed cylinder, and the adjusting knob is threadedly connected to the second connecting rod, a driving block is fixed to the second connecting rod near the first connecting rod, and the ends of the driving block opposite to the first connecting rod are respectively provided with guide inclined surfaces parallel to each other, and when the driving block moves downward, it pushes the first connecting rod to move radially outward along the fixed cylinder.

[0009] Furthermore, a guide slider is fixed on the second connecting rod, and the guide slider is slidably connected to the inner wall of the fixed cylinder via a slide rail.

[0010] Furthermore, a tension adjustment mechanism for adjusting the tension of the sound insulation cotton is arranged on one side of the top end of the base, and the tension adjustment mechanism includes a third guide roller and a linear driving member for driving the third guide roller to move horizontally.

[0011] Furthermore, the third guide roller is a hollow structure, and both axial ends of the third guide roller are connected to water pipes via rotary joints.

[0012] Furthermore, pressure rollers are rotatably installed on both sides of the detection chamber, and the pressure rollers are used to press the sound insulation cotton onto one side of the partition.

[0013] Furthermore, the side wall of the detection cavity is a hollow structure, and the side wall of the detection cavity is filled with sound insulation cotton.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The automobile engine sound insulation cotton testing device is provided with a detection cavity, and a loudspeaker, a receiver, a heating element, a first temperature sensor and a second temperature sensor are arranged on both sides of the detection cavity. When the sound insulation cotton passes through the detection cavity, the sound insulation and heat insulation effects of the sound insulation cotton can be simultaneously detected, and the detection is more comprehensive.

[0016] By arranging the first rotating disk, the second rotating disk, the inner support positioning mechanism and the rotating drive mechanism, the sound insulation cotton is unwound on one side and reeled in on the other side, so that a roll of sound insulation cotton can be fully tested, and the test is more accurate and comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the top view structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the sound insulation cotton route of the present invention;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the rotary drive mechanism of the present invention;

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the guide mechanism of the present invention;

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the inner support positioning mechanism of the present invention;

[0023] Figure 7 It is a schematic cross-sectional view of the internal support positioning mechanism of the present invention;

[0024] Figure 8 It is an exploded schematic diagram of the inner support positioning mechanism of the present invention.

[0025] In the figure: 1, base; 2, detection cavity; 201, opening; 202, first cavity; 203, second cavity; 3, partition; 4, loudspeaker; 5, receiver; 6, heating element; 7, first temperature sensor; 8, second temperature sensor; 9, first rotating disk; 10, second rotating disk; 11, inner support positioning mechanism; 1101, fixing cylinder; 1102, positioning plate; 1103, first connecting rod; 1104, second connecting rod; 1105, adjusting knob; 1106, driving block; 1107, guide slider; 12 , rotating drive mechanism; 1201, first pulley; 1202, second pulley; 1203, motor; 1204, transmission belt; 13, guiding mechanism; 1301, first fixed frame; 1302, second fixed frame; 1303, first guide roller; 1304, second guide roller; 1305, movable frame; 1306, sliding rod; 1307, spring; 1308, limit block; 14, tension adjusting mechanism; 1401, third guide roller; 1402, linear driving member; 15, clamping roller; 16, sound insulation cotton. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. In the description of the present invention, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In order to make the terms "including" and any variations of them in the specification and claims of the present invention and the above-mentioned drawings, it is intended to cover non-exclusive inclusions.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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.

[0028] See also Figure 1-8An embodiment of the present invention is provided: a car engine sound insulation cotton testing device, comprising a base 1 and a detection chamber 2 installed in the middle of the top of the base 1. In this embodiment, the side wall of the detection chamber 2 is a hollow structure, and the side wall of the detection chamber 2 is filled with sound insulation cotton, which can reduce the influence of the external environment on the detection result. Specifically, the top of the detection chamber 2 is detachably installed with a top cover to facilitate inspection and maintenance. Openings 201 for feeding and discharging are respectively provided on both sides of the detection chamber 2, and the two openings 201 are in a straight line. A partition 3 is provided inside the detection chamber 2, and the partition 3 divides the inside of the detection chamber 2 into a relatively independent first cavity 202 and a second cavity 203. Specifically, the partition 3 is arranged on one side of the two openings 201, and the partition 3 can simulate the hood of a car engine. A loudspeaker 4, a heating element 6 and a first temperature sensor 7 are installed inside the first cavity 202, and a microphone 5 and a second temperature sensor 8 are installed inside the second cavity 203. The second temperature sensor 8 is installed inside the second cavity 203. The sensor 8 is specifically installed on the partition 3 and is used to detect the temperature of the partition 3. During detection, sound is emitted through the loudspeaker 4 and received by the microphone 5. The sound volume when the sound insulation cotton 16 is placed and not placed is compared to measure the sound insulation effect of the sound insulation cotton 16. The high temperature environment when the engine is working is simulated by the heating element 6. The temperatures of the first cavity 202 and the second cavity 203 are detected and compared by the first temperature sensor 7 and the second temperature sensor 8. Not only the sound insulation effect of the sound insulation cotton 16 in the high temperature environment can be measured, but also the heat insulation effect of the sound insulation cotton 16 can be measured to improve the test efficiency.

[0029] Reference Figure 5 The outer sides of the two openings 201 are both provided with guide mechanisms 13. Specifically, the guide mechanisms 13 include a first fixed frame 1301 and a second fixed frame 1302 symmetrically installed on both sides of the width of the opening 201. The first fixed frame 1301 and the second fixed frame 1302 are specifically C-shaped frames with one side open. A first guide roller 1303 is rotatably installed inside the first fixed frame 1301. A second guide roller 1304 is rotatably installed inside the second fixed frame 1302 through an elastic support component. The elastic support component is used to push the second guide roller 1304 to move toward a side close to the first guide roller 1303. The elastic support component specifically includes a horizontally sliding member arranged on the second fixed frame 1302. The inner movable frame 1305, the second guide roller 1304 is rotatably installed inside the movable frame 1305, and two sliding rods 1306 are horizontally arranged on the side of the movable frame 1305 away from the first guide roller 1303. The sliding rod 1306 passes through the side wall of the second fixed frame 1302 and fixes the limiting block 1308, and the sliding rod 1306 is slidably connected with the second fixed frame 1302. The sliding rod 1306 is sleeved with a spring 1307 that pushes the movable frame 1305 and the second guide roller 1304 to move closer to the first guide roller 1303. The sound insulation cotton 16 is rollingly connected with the first guide roller 1303 and the second guide roller 1304 to avoid scratching against the opening 201 when entering and exiting.

[0030] The first rotating disk 9 and the second rotating disk 10 are respectively arranged on both sides of the top of the base 1, and the bottom of the base 1 is provided with a rotating driving mechanism 12 for driving the first rotating disk 9 and the second rotating disk 10 to rotate synchronously. Figure 4 The rotating drive mechanism 12 includes a first pulley 1201 fixed to the bottom ends of the first rotating disk 9 and the second rotating disk 10 through a rotating shaft, a second pulley 1202 rotatably installed inside the base 1, a motor 1203 driving the second pulley 1202 to rotate, and a transmission belt 1204 connecting the first pulley 1201 and the second pulley 1202. The first pulley 1201 is located inside the base 1. When working, the second pulley 1202 is driven to rotate by the motor 1203, and then the two first pulleys 1201 are driven by the transmission belt 1204. The first pulley 1201 drives the first rotating disk 9 and the second rotating disk 10 to rotate synchronously. When the sound insulation cotton 16 is placed on the first rotating disk 9, an empty roll is placed on the top of the second rotating disk 10, and the material is discharged on one side and collected on the other side. By actively discharging and collecting the material, the length of the sound insulation cotton entering the detection chamber 2 can be controlled to avoid bending and wrinkling of the sound insulation cotton, which affects the detection result. At the same time, the residence time of the sound insulation cotton 16 can be controlled. Furthermore, the bottom ends of the first rotating disk 9 and the second rotating disk 10 can be directly connected to the motor or a separate pulley mechanism can be set to drive them.

[0031] The first rotating disk 9 and the second rotating disk 10 are both provided with an inner support positioning mechanism 11 fixed to the central roll of the sound insulation cotton 16, as shown in the attached Figure 6-8The inner support positioning mechanism 11 includes a fixed cylinder 1101 vertically fixed to the top of the first rotating disk 9 or the second rotating disk 10 and two positioning plates 1102 arranged in a circular array on the outside of the fixed cylinder 1101 with the fixed cylinder 1101 as the center. The positioning plate 1102 is specifically an arc-shaped plate structure. Two first connecting rods 1103 horizontally slidably connected to the fixed cylinder 1101 are fixed on the inner side wall of the positioning plate 1102 along its length direction. The side wall of the fixed cylinder 1101 is penetrated by a first connecting rod 1103 horizontally slidably connected to the fixed cylinder 1101. The through hole that matches the connecting rod 1103 is further provided. In order to prevent the first connecting rod 1103 from being separated from the interior of the fixed cylinder 1101, a limiting convex ring is provided on the first connecting rod 1103 inside the fixed cylinder 1101. A second connecting rod 1104 is provided vertically and movably up and down inside the fixed cylinder 1101. The upper section of the second connecting rod 1104 is provided with an external thread. The top of the fixed cylinder 1101 is provided with an adjusting knob 1105 that is rotatable through an annular slide rail, and the center of the adjusting knob 1105 is aligned with the first connecting rod 1103. The second connecting rod 1104 is threadedly connected, and the second connecting rod 1104 can be driven to move vertically up and down by rotating the adjustment knob 1105. A driving block 1106 is fixed to the second connecting rod 1104 near the first connecting rod 1103, and the driving block 1106 is respectively provided with mutually parallel guiding inclined surfaces at the ends opposite to the first connecting rod 1103. When the driving block 1106 moves downward, it pushes the first connecting rod 1103 to move radially outward along the fixed cylinder 1101, so that the winding drum is sleeved on the fixed cylinder 1101. When the cylinder 1101 and the positioning plate 1102 are outside, the second connecting rod 1104 is driven to rotate downward, and the first connecting rod 1103 and the positioning plate 1102 are driven to move outward to support the inner wall of the reel, so that the sound insulation cotton 16 and the fixed cylinder 1101 can rotate synchronously to actively reel in and release the material. Furthermore, a non-slip rubber pad can be provided on the outer circumferential surface of the positioning plate 1102 to increase the friction with the reel. When disassembling, the adjusting knob 1105 can be rotated in the opposite direction to easily remove the sound insulation cotton 16 and the reel upwards.

[0032] Furthermore, a guide slider 1107 is fixed on the second connecting rod 1104 , and the guide slider 1107 is slidably connected to the inner wall of the fixed cylinder 1101 via a slide rail, so as to ensure that the second connecting rod 1104 moves vertically up and down.

[0033] Further, see Attachment Figure 1 Pressure rollers 15 are rotatably installed on both sides of the detection chamber 2, and the pressure rollers 15 are used to press the sound insulation cotton 16 onto one side of the partition 3. On the one hand, it can simulate the actual assembly situation, that is, the sound insulation cotton 16 is installed on the engine hood. On the other hand, the two pressure rollers 15 can flatten the sound insulation cotton to avoid wrinkles and improve the detection accuracy.

[0034] Further, see Attachment Figure 1A tension adjusting mechanism 14 for adjusting the tension of the sound insulation cotton 16 is provided on one side of the top of the base 1, and the tension adjusting mechanism 14 includes a third guide roller 1401 and a linear driving component 1402 for pushing the third guide roller 1401 to move horizontally. The linear driving component 1402 can be any one of an electric push rod and a cylinder, which is horizontally installed on the top of the base 1 near the second rotating disk 10 through a support plate. A tension sensor is installed on the third guide roller 1401. The third guide roller 1401 is pushed to move horizontally by the extension and retraction of the linear driving component 1402 to adjust the tension of the sound insulation cotton 16 to avoid bending of the sound insulation cotton 16 during detection and affecting the detection accuracy.

[0035] In this embodiment, the third guide roller 1401 is a hollow structure, and the axial ends of the third guide roller 1401 are respectively connected to water pipes through rotating joints. When the heating element 6 is turned on for detection, cooling water can be continuously introduced into the third guide roller 1401 to assist the sound insulation cotton 16 in rapid cooling.

[0036] Furthermore, the automobile engine sound insulation cotton testing device also includes a controller, the output ends of the first temperature sensor 7 and the second temperature sensor 8 are electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the input ends of the loudspeaker 4, the receiver 5, the heater 6, the motor 1203, and the linear drive 1402, so that the operation of each device can be intelligently controlled.

[0037] Working principle: first turn on the switch of the loudspeaker 4, and measure the sound size without the sound insulation cotton through the microphone 5, then insert the central reel of a roll of sound insulation cotton 16 on the outside of the fixed cylinder 1101 and the positioning plate 1102, rotate the adjustment knob 1105, and drive the second connecting rod 1104 and the driving block 1106 to move vertically downward synchronously. When the guide slope at one end of the driving block 1106 slides downward on the guide slope at one end of the first connecting rod 1103, it pushes the first connecting rod 1103 to move radially outward along the fixed cylinder 1101, so that each positioning plate 1102 opens outward to press against the inner side wall of the central reel of the sound insulation cotton 16 to achieve internal support and fixation. Similarly, a new reel is fixed on the outside of the internal support positioning mechanism 11 at the top of the second rotating disk 10. After the sound insulation cotton 16 passes through the first guide roller 1303 and the second guide roller 1304 and enters the interior of the detection chamber 2, it is pressed tightly against one side of the partition 3 by the clamping roller 15, and the sound insulation cotton 16 then passes through The guide mechanism 13 on the other side extends to the outside of the detection cavity 2, and bypasses the outside of the third guide roller 1401 and is fixed to the central reel at the top of the second rotating disk 10. When the first rotating disk 9 and the second rotating disk 10 are driven to rotate by the rotating drive mechanism 12, the sound insulation cotton 16 can be driven to actively unwind and rewind. The tension of the sound insulation cotton 16 is adjusted by the extension and contraction of the linear drive member 1402 to avoid wrinkles that affect the detection effect. During the detection, the sound volume after the sound insulation cotton 16 is placed is measured by the microphone 5, and the sound insulation effect of the sound insulation cotton 16 is measured by comparing the two sound volumes. The heating element 6 is used to heat the first cavity 202 to increase the internal temperature of the first cavity 202, and the sound volume measured by the microphone 5 in the high temperature environment is tested simultaneously. The temperature difference between the first cavity 202 and the second cavity 203 is measured by the first temperature sensor 7 and the second temperature sensor 8. Not only the sound insulation effect of the sound insulation cotton 16 in the high temperature environment can be measured, but also the heat insulation effect of the sound insulation cotton 16 can be measured simultaneously.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. Automobile engine sound insulation cotton testing device, characterized by: The invention comprises a base (1) and a detection chamber (2) installed in the middle of the top of the base (1), openings (201) for feeding and discharging materials are respectively arranged on both sides of the detection chamber (2), a partition (3) is arranged inside the detection chamber (2), and the partition (3) divides the inside of the detection chamber (2) into a relatively independent first cavity (202) and a second cavity (203), a loudspeaker (4), a heating element (6) and a first temperature sensor (7) are installed inside the first cavity (202), a receiver (5) and a second temperature sensor (8) are installed inside the second cavity (203), and the two openings (201) are provided with a plurality of openings (201) and a plurality of openings (201) and a plurality of openings (201) respectively. A guide mechanism (13) is provided on the outside, a first rotating disk (9) and a second rotating disk (10) are provided on both sides of the top of the base (1), and a rotating drive mechanism (12) for driving the first rotating disk (9) and the second rotating disk (10) to rotate synchronously is provided at the bottom of the base (1), an inner support positioning mechanism (11) fixed to the central reel of the sound insulation cotton (16) is provided at the center of the first rotating disk (9) and the second rotating disk (10), and a pressing roller (15) is rotatably installed on both sides of the inside of the detection chamber (2), and the pressing roller (15) is used to press the sound insulation cotton (16) against one side of the partition (3).

2. The automobile engine sound insulation cotton testing device according to claim 1 is characterized in that: The rotary drive mechanism (12) comprises a first pulley (1201) fixed to the bottom ends of the first rotating disk (9) and the second rotating disk (10) via rotating shafts, respectively, a second pulley (1202) rotatably mounted inside the base (1), a motor (1203) driving the second pulley (1202) to rotate, and a transmission belt (1204) connecting the first pulley (1201) and the second pulley (1202), wherein the first pulley (1201) is located inside the base (1).

3. The automobile engine sound insulation cotton testing device according to claim 1 is characterized in that: The guide mechanism (13) comprises a first fixed frame (1301) and a second fixed frame (1302) symmetrically mounted on both sides of the width of the opening (201); a first guide roller (1303) is rotatably mounted inside the first fixed frame (1301); a second guide roller (1304) is rotatably mounted inside the second fixed frame (1302) via an elastic support component; and the elastic support component is used to push the second guide roller (1304) to move toward a side close to the first guide roller (1303).

4. The automobile engine sound insulation cotton testing device according to claim 1 is characterized in that: The inner support positioning mechanism (11) comprises a fixed cylinder (1101) vertically fixed to the top of the first rotating disk (9) or the second rotating disk (10) and a plurality of positioning plates (1102) arranged in a circular array on the outside of the fixed cylinder (1101) with the fixed cylinder (1101) as the center, a plurality of first connecting rods (1103) horizontally slidably connected to the fixed cylinder (1101) are fixed on the inner side wall of the positioning plate (1102) along its length direction, and a second connecting rod (1104) is vertically movably arranged inside the fixed cylinder (1101). The top end of the fixed cylinder (1101) is rotatably provided with an adjusting knob (1105), and the adjusting knob (1105) is threadedly connected to the second connecting rod (1104); a driving block (1106) is fixed to the second connecting rod (1104) near the first connecting rod (1103); and the driving block (1106) is provided with mutually parallel guiding inclined surfaces at one end opposite to the first connecting rod (1103); when the driving block (1106) moves downward, it pushes the first connecting rod (1103) to move radially outwardly of the fixed cylinder (1101).

5. The automobile engine sound insulation cotton testing device according to claim 4 is characterized in that: A guide slider (1107) is fixed on the second connecting rod (1104), and the guide slider (1107) is slidably connected to the inner wall of the fixed cylinder (1101) via a slide rail.

6. The automobile engine sound insulation cotton testing device according to claim 1 is characterized in that: A tension adjustment mechanism (14) for adjusting the tension of the sound insulation cotton (16) is arranged on one side of the top end of the base (1), and the tension adjustment mechanism (14) comprises a third guide roller (1401) and a linear drive member (1402) for driving the third guide roller (1401) to move horizontally.

7. The automobile engine sound insulation cotton testing device according to claim 6 is characterized in that: The third guide roller (1401) is a hollow structure, and two axial ends of the third guide roller (1401) are respectively connected to water pipes via rotating joints.

8. The automobile engine sound insulation cotton testing device according to claim 1 is characterized in that: The side wall of the detection cavity (2) is a hollow structure, and the side wall of the detection cavity (2) is filled with sound insulation cotton.

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